html5/spec/diff/Overview.html - view

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Tue Jun 10 13:09:36 2008 UTC (16 years, 11 months ago) by mike
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CVS tags: html5_2nd_WD_20080610, HEAD

this should be final diff

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">  <html lang="en-US"> <head> <meta name="generator" content= "HTML Tidy for Linux (vers 1 September 2005), see www.w3.org"> <title>HTML 5</title> <style type="text/css"> dt, dfn { font-weight: bold; font-style: normal; } img.extra { float: right; } body ins, body del { display: block; } body * ins, body * del { display: inline; } pre, code { color: black; background: transparent; font-size: inherit; font-family: monospace; } pre strong { color: black; font: inherit; font-weight: bold; background: yellow; } pre em { font-weight: bolder; font-style: normal; } pre.idl :link, pre.idl :visited { color: inherit; background: transparent; } pre.idl { border: solid thin; background: #EEEEEE; color: black; padding: 0.5em; } table { border-collapse: collapse; border-style: hidden hidden none hidden; } table thead { border-bottom: solid; } table tbody th:first-child { border-left: solid; } table td, table th { border-left: solid; border-right: solid; border-bottom: solid thin; vertical-align: top; padding: 0.2em; } ul.toc dfn, h1 dfn, h2 dfn, h3 dfn, h4 dfn, h5 dfn, h6 dfn { font: inherit; } ul.toc li ul { margin-bottom: 0.75em; } ul.toc li ul li ul { margin-bottom: 0.25em; } var sub { vertical-align: bottom; font-size: smaller; position: relative; top: 0.1em; } @media screen { code { color: rgb(255, 69, 0); background: transparent; } } code :link, code :visited { color: inherit; background: transparent; } .example { display: block; color: #222222; background: #FCFCFC; border-left: double; margin-left: 1em; padding-left: 1em; } .issue, .big-issue { color: #E50000; background: white; border: solid red; padding: 0.5em; margin: 1em 0; } .issue > :first-child, .big-issue > :first-child { margin-top: 0; } p .big-issue { line-height: 3em; } .note { color: green; background: transparent; } .note { font-family: sans-serif; } p.note:before { content: 'Note: '; } .warning { color: red; background: transparent; } .warning:before { font-style: normal; } p.warning:before { content: '\26A0 Warning! '; } .note, .warning { font-weight: bolder; font-style: italic; padding: 0.5em 2em; } .copyright { margin: 0.25em 0; } img { max-width: 100%; } h4 + .element { margin-top: -2.5em; padding-top: 2em; } h4 + p + .element { margin-top: -5em; padding-top: 4em; } .element { background: #EEEEFF; color: black; margin: 0 0 1em -1em; padding: 0 1em 0.25em 0.75em; border-left: solid #9999FF 0.25em; } table.matrix, table.matrix td { border: none; text-align: right; } table.matrix { margin-left: 2em; } </style> <link href="http://www.w3.org/StyleSheets/TR/%57%33%43-WD" rel= "stylesheet" type="text/css"> </head> <body> <div class="head"> <a href="http://www.w3.org/"><img alt="W3C" height="48" src= "http://www.w3.org/Icons/w3c_home" width="72"></a> <h1 id="html-5">HTML 5</h1> <h2 class="no-num no-toc" id="a-vocabulary">A vocabulary and associated APIs for HTML and XHTML</h2> <h2 class="no-num no-toc" id="w3c-working">W3C Working Draft <del class="diff-old">22 January</del> <ins class="diff-chg">10 June</ins> 2008</h2> <dl> <dt>This Version:</dt> <dd><del class= "diff-old">http://www.w3.org/TR/2008/WD-html5-20080122/</del> <a href="http://www.w3.org/TR/2008/WD-html5-20080610"><ins class= "diff-chg">http://www.w3.org/TR/2008/WD-html5-20080610/</ins></a></dd> <dt>Latest Published Version:</dt> <dd><a href= "http://www.w3.org/TR/html5/">http://www.w3.org/TR/html5/</a></dd> <dt>Latest Editor's Draft:</dt> <dd><a href= "http://www.w3.org/html/wg/html5/">http://www.w3.org/html/wg/html5/</a></dd> <dt><ins class="diff-new">Previous Versions:</ins></dt> <dd><a href= "http://www.w3.org/TR/2008/WD-html5-20080122/"><ins class= "diff-new">http://www.w3.org/TR/2008/WD-html5-20080122/</ins></a></dd> <dt>Editors:</dt> <dd><a href="mailto:ian@hixie.ch">Ian Hickson</a> , Google, Inc.</dd> <dd>David Hyatt, Apple, Inc.</dd> </dl> <ins class="diff-new">The content of this document is also available in the following normative format:</ins> <ul> <li><ins class="diff-new">As a</ins> <a href= "http://www.w3.org/TR/2008/WD-html5-20080610/"><ins class= "diff-new">multipage HTML file</ins></a></li> </ul> <ins class="diff-new">The content is also available in the following non-normative format:</ins> <ul> <li><ins class="diff-new">As a</ins> <a href= "http://www.w3.org/TR/2008/WD-html5-20080610/diff/"><ins class= "diff-new">diff-marked version</ins></a> <ins class= "diff-new">showing changes made between 22 January 2008 and 10 June 2008</ins></li> </ul> <a href= "http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2008 <a href="http://www.w3.org/"><abbr title= "World Wide Web Consortium">W3C</abbr></a> ® ( <a href= "http://www.csail.mit.edu/"><abbr title= "Massachusetts Institute of Technology">MIT</abbr></a> , <a href= "http://www.ercim.org/"><abbr title= "European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a> , <a href="http://www.keio.ac.jp/">Keio</a> ), All Rights Reserved. W3C <a href= "http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a> , <a href= "http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href= "http://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply. </div> <hr> <h2 class="no-num no-toc" id="abstract">Abstract</h2> This specification defines the 5th major revision of the core language of the World Wide <del class="diff-old">Web, HTML.</del> <ins class="diff-chg">Web: the Hypertext Markup Language (HTML).</ins> In this version, new features are introduced to help Web application authors, new elements are introduced based on research into prevailing authoring practices, and special attention has been given to defining clear conformance criteria for user agents in an effort to improve interoperability. <h2 class="no-num no-toc" id="status">Status of this document</h2> This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the <del class= "diff-old">latest</del> <ins class="diff-chg">most recently formally published</ins> revision of this technical report can be found in the <a href="http://www.w3.org/TR/">W3C technical reports index</a> at http://www.w3.org/TR/. If you wish to make comments regarding this document, please send them to <a href= "mailto:public-html-comments@w3.org">public-html-comments@w3.org</a> ( <a href= "mailto:public-html-comments-request@w3.org?subject=subscribe">subscribe</a> , <a href= "http://lists.w3.org/Archives/Public/public-html-comments/">archives</a> ). All feedback is welcome. Implementors should be aware that this specification is not stable. Implementors who are not taking part in the discussions are likely to find the specification changing out from under them in incompatible ways. Vendors interested in implementing this specification before it eventually reaches the Candidate Recommendation stage should join the aforementioned mailing lists and take part in the discussions. The publication of this document by the W3C as a W3C Working Draft does not imply that all of the participants in the W3C HTML working group endorse the contents of the specification. Indeed, for any section of the specification, one can usually find many members of the working group or of the W3C as a whole who object strongly to the current text, the existence of the section at all, or the idea that the working group should even spend time discussing the concept of that section. The <ins class="diff-new">changes made to this draft specification after the 22 January 2008 First Public Working Draft and this 10 June 2008 Working Draft are recorded in the following documents:</ins> <ul> <li><ins class="diff-new">A non-normative</ins> <a href= "http://www.w3.org/TR/2008/WD-html5-20080610/diff/"><ins class= "diff-new">diff-marked version</ins></a> <ins class="diff-new">of the specification</ins></li> <li><ins class="diff-new">A non-normative</ins> <a href= "http://www.w3.org/TR/2008/NOTE-html5-pubnotes-20080610/"><ins class="diff-new"> HTML 5 Publication Notes</ins></a> <ins class="diff-new">document that provides prose descriptions of the changes.</ins></li> </ul> <ins class="diff-new">The following document is also available; it describes the differences between HTML 5 and the previous major version of the language, HTML 4:</ins> <ul> <li><a href= "http://www.w3.org/TR/2008/WD-html5-diff-20080610/"><ins class= "diff-new">HTML 5 differences from HTML 4</ins></a></li> </ul> <ins class="diff-new">The</ins> W3C <a href= "http://www.w3.org/html/wg/">HTML Working Group</a> is the W3C working group responsible for this specification's progress along the W3C Recommendation track. This specification is the <del class= "diff-old">22 January</del> <ins class="diff-chg">10 June</ins> 2008 <del class="diff-old">First Public</del> Working Draft. This document was produced by a group operating under the <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 W3C Patent Policy</a> . W3C maintains a <a href= "http://www.w3.org/2004/01/pp-impl/40318/status" rel= "disclosure">public list of any patent disclosures</a> made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains <a href= "http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential"> Essential Claim(s)</a> must disclose the information in accordance with <a href= "http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure"> section 6 of the W3C Patent Policy</a> . <h3 class="no-num no-toc" id="stability0">Stability</h3> Different parts of this specification are at different levels of maturity. <div id="stability"></div> Some of the more major known issues are marked like this. There are many other issues that have been raised as well; the issues given in this document are not the only known issues! There are also some spec-wide issues that have not yet been addressed: case-sensitivity is a very poorly handled topic right now, and the firing of events needs to be unified (right now some bubble, some don't, they all use different text to fire events, etc). It would also be nice to unify the rules on downloading content when attributes change (e.g. <code title="">src</code> attributes) - should they initiate downloads when the element immediately, is inserted in the document, when active scripts end, etc. This matters e.g. if an attribute is set twice in a row (does it hit the network twice). <h2 class="no-num no-toc" id="contents">Table of contents</h2> <ul class="toc"> <li><a href="#introduction">1. Introduction</a> <ul class="toc"> <li><a href="#scope"><del class= "diff-old">1.1.</del> <ins class="diff-chg">1.1</ins> Scope</a> <ul class="toc"> <li><a href="#relationship"><del class= "diff-old">1.1.1.</del> <ins class="diff-chg">1.1.1</ins> Relationship to HTML 4.01, XHTML 1.1, DOM2 HTML</a></li> <li><a href="#relationship0"><del class= "diff-old">1.1.2.</del> <ins class="diff-chg">1.1.2</ins> Relationship to XHTML2</a></li> <li><a href="#relationship1"><del class= "diff-old">1.1.3.</del> <ins class="diff-chg">1.1.3</ins> Relationship to XUL, Flash, Silverlight, and other proprietary UI languages</a></li> </ul> </li> <li><a href="#structure"><del class= "diff-old">1.2.</del> <ins class="diff-chg">1.2</ins> Structure of this specification</a> <ul class="toc"> <li><a href="#how-to"><del class= "diff-old">1.2.1.</del> <ins class="diff-chg">1.2.1</ins> How to read this specification</a></li> </ul> </li> <li><a href="#conformance"><del class= "diff-old">1.3.</del> <ins class="diff-chg">1.3</ins> Conformance requirements</a> <ul class="toc"> <li><a href="#common"><del class= "diff-old">1.3.1.</del> <ins class="diff-chg">1.3.1</ins> Common conformance requirements for APIs exposed to JavaScript</a></li> <li><a href="#dependencies"><del class= "diff-old">1.3.2.</del> <ins class="diff-chg">1.3.2</ins> Dependencies</a></li> <li><a href="#features"><del class= "diff-old">1.3.3.</del> <ins class="diff-chg">1.3.3</ins> Features defined in other specifications</a></li> </ul> </li> <li><a href="#terminology"><del class= "diff-old">1.4.</del> <ins class="diff-chg">1.4</ins> Terminology</a> <ul class="toc"> <li><a href="#html-vs"><del class= "diff-old">1.4.1.</del> <ins class="diff-chg">1.4.1</ins> HTML vs XHTML</a></li> </ul> </li> </ul> </li> <li><a href="#dom">2. The Document Object Model</a> <ul class="toc"> <li><a href="#documents"><del class= "diff-old">2.1.</del> <ins class="diff-chg">2.1</ins> Documents</a> <ul class="toc"> <li><a href="#security"><del class= "diff-old">2.1.1.</del> <ins class="diff-chg">2.1.1</ins> Security</a></li> <li><a href="#resource"><del class= "diff-old">2.1.2.</del> <ins class="diff-chg">2.1.2</ins> Resource metadata management</a></li> </ul> </li> <li><a href="#elements"><del class= "diff-old">2.2.</del> <ins class="diff-chg">2.2</ins> Elements</a> <ul class="toc"> <li><a href="#reflecting"><del class= "diff-old">2.2.1.</del> <ins class="diff-chg">2.2.1</ins> Reflecting content attributes in DOM attributes</a></li> </ul> </li> <li><a href="#common0"><del class= "diff-old">2.3.</del> <ins class="diff-chg">2.3</ins> Common DOM interfaces</a> <ul class="toc"> <li><a href="#collections"><del class= "diff-old">2.3.1.</del> <ins class="diff-chg">2.3.1</ins> Collections</a> <ul class="toc"> <li><a href="#htmlcollection">2.3.1.1. HTMLCollection</a></li> <li><a href="#htmlformcontrolscollection">2.3.1.2. HTMLFormControlsCollection</a></li> <li><a href="#htmloptionscollection">2.3.1.3. HTMLOptionsCollection</a></li> </ul> </li> <li><a href="#domtokenlist"><del class= "diff-old">2.3.2.</del> <ins class="diff-chg">2.3.2</ins> DOMTokenList</a></li> <li><a href="#domstringmap"><ins class= "diff-new">2.3.3</ins> <ins class= "diff-new">DOMStringMap</ins></a></li> <li><a href="#dom-feature"><del class= "diff-old">2.3.3.</del> <ins class="diff-chg">2.3.4</ins> DOM feature strings</a></li> </ul> </li> <li><a href="#dom-tree"><del class= "diff-old">2.4.</del> <ins class="diff-chg">2.4</ins> DOM tree accessors</a></li> <li><a href="#dynamic"><del class= "diff-old">2.5.</del> <ins class="diff-chg">2.5</ins> Dynamic markup insertion</a> <ul class="toc"> <li><a href="#controlling"><del class= "diff-old">2.5.1.</del> <ins class="diff-chg">2.5.1</ins> Controlling the input stream</a></li> <li><a href="#dynamic0"><del class= "diff-old">2.5.2.</del> <ins class="diff-chg">2.5.2</ins> Dynamic markup insertion in HTML</a></li> <li><a href="#dynamic1"><del class= "diff-old">2.5.3.</del> <ins class="diff-chg">2.5.3</ins> Dynamic markup insertion in XML</a></li> </ul> </li> <li><a href="#apis-in"><del class= "diff-old">2.6.</del> <ins class="diff-chg">2.6</ins> APIs in HTML documents</a></li> </ul> </li> <li><a href="#semantics">3. Semantics and structure of HTML elements</a> <ul class="toc"> <li><a href="#semantics-intro"><del class= "diff-old">3.1.</del> <ins class="diff-chg">3.1</ins> Introduction</a></li> <li><a href="#common1"><del class= "diff-old">3.2.</del> <ins class="diff-chg">3.2</ins> Common microsyntaxes</a> <ul class="toc"> <li><a href="#common2"><del class= "diff-old">3.2.1.</del> <ins class="diff-chg">3.2.1</ins> Common parser idioms</a></li> <li><a href="#boolean"><del class= "diff-old">3.2.2.</del> <ins class="diff-chg">3.2.2</ins> Boolean attributes</a></li> <li><a href="#numbers"><del class= "diff-old">3.2.3.</del> <ins class="diff-chg">3.2.3</ins> Numbers</a> <ul class="toc"> <li><a href="#unsigned">3.2.3.1. Unsigned integers</a></li> <li><a href="#signed">3.2.3.2. Signed integers</a></li> <li><a href="#real-numbers">3.2.3.3. Real numbers</a></li> <li><a href="#ratios">3.2.3.4. Ratios</a></li> <li><a href="#percentages-and-dimensions">3.2.3.5. Percentages and dimensions</a></li> <li><a href="#lists">3.2.3.6. Lists of integers</a></li> </ul> </li> <li><a href="#dates"><del class= "diff-old">3.2.4.</del> <ins class="diff-chg">3.2.4</ins> Dates and times</a> <ul class="toc"> <li><a href="#specific">3.2.4.1. Specific moments in time</a></li> <li><a href="#vaguer">3.2.4.2. Vaguer moments in time</a></li> </ul> </li> <li><a href="#time-offsets"><del class= "diff-old">3.2.5.</del> <ins class="diff-chg">3.2.5</ins> Time offsets</a></li> <li><a href="#tokens"><del class= "diff-old">3.2.6.</del> <ins class="diff-chg">3.2.6</ins> Tokens</a></li> <li><a href="#keywords"><del class= "diff-old">3.2.7.</del> <ins class="diff-chg">3.2.7</ins> Keywords and enumerated attributes</a></li> <li><a href="#syntax-references"><del class= "diff-old">3.2.8.</del> <ins class="diff-chg">3.2.8</ins> References</a></li> <li><a href="#urls"><ins class= "diff-new">3.2.9</ins> <ins class= "diff-new">URLs</ins></a></li> </ul> </li> <li><a href="#documents0"><del class= "diff-old">3.3.</del> <ins class="diff-chg">3.3</ins> Documents and document fragments</a> <ul class="toc"> <li><a href="#semantics0"><del class= "diff-old">3.3.1.</del> <ins class="diff-chg">3.3.1</ins> Semantics</a></li> <li><a href="#structure0"><del class= "diff-old">3.3.2.</del> <ins class="diff-chg">3.3.2</ins> Structure</a></li> <li><a href="#kinds"><del class= "diff-old">3.3.3.</del> <ins class="diff-chg">3.3.3</ins> Kinds of content</a> <ul class="toc"> <li><a href="#metadata">3.3.3.1. Metadata content</a></li> <li><a href="#flow-content">3.3.3.2. <del class="diff-old">Prose</del> <ins class="diff-chg">Flow</ins> content</a></li> <li><a href="#sectioning">3.3.3.3. Sectioning content</a></li> <li><a href="#heading">3.3.3.4. Heading content</a></li> <li><a href="#phrasing">3.3.3.5. Phrasing content</a></li> <li><a href="#embedded">3.3.3.6. Embedded content</a></li> <li><a href="#interactive0">3.3.3.7. Interactive content</a></li> </ul> </li> <li><a href="#transparent"><del class= "diff-old">3.3.4.</del> <ins class="diff-chg">3.3.4</ins> Transparent content models</a></li> <li><a href="#paragraphs"><del class= "diff-old">3.3.5.</del> <ins class="diff-chg">3.3.5</ins> Paragraphs</a></li> </ul> </li> <li><a href="#global"><del class= "diff-old">3.4.</del> <ins class="diff-chg">3.4</ins> Global attributes</a> <ul class="toc"> <li><a href="#the-id"><del class= "diff-old">3.4.1.</del> <ins class="diff-chg">3.4.1</ins> The <code>id</code> attribute</a></li> <li><a href="#the-title"><del class= "diff-old">3.4.2.</del> <ins class="diff-chg">3.4.2</ins> The <code>title</code> attribute</a></li> <li><a href="#the-lang"><del class= "diff-old">3.4.3.</del> <ins class="diff-chg">3.4.3</ins> The <code>lang</code> (HTML only) and <code>xml:lang</code> (XML only) attributes</a></li> <li><a href="#the-xmlbase"><ins class= "diff-new">3.4.4</ins> <ins class="diff-new">The</ins> <code><ins class="diff-new">xml:base</ins></code> <ins class= "diff-new">attribute (XML only)</ins></a></li> <li><a href="#the-dir"><del class= "diff-old">3.4.4.</del> <ins class="diff-chg">3.4.5</ins> The <code>dir</code> attribute</a></li> <li><a href="#classes"><del class= "diff-old">3.4.5.</del> <ins class="diff-chg">3.4.6</ins> The <code>class</code> attribute</a></li> <li><a href="#the-irrelevant"><del class= "diff-old">3.4.6.</del> <ins class="diff-chg">3.4.7</ins> The <code>irrelevant</code> attribute</a></li> <li><a href="#the-style"><ins class= "diff-new">3.4.8</ins> <ins class="diff-new">The</ins> <code><ins class="diff-new">style</ins></code> <ins class= "diff-new">attribute</ins></a></li> <li><a href="#embedding"><ins class= "diff-new">3.4.9</ins> <ins class="diff-new">Embedding custom non-visible data</ins></a></li> </ul> </li> <li><a href="#interaction"><del class= "diff-old">3.5.</del> <ins class="diff-chg">3.5</ins> Interaction</a> <ul class="toc"> <li><a href="#activation"><del class= "diff-old">3.5.1.</del> <ins class="diff-chg">3.5.1</ins> Activation</a></li> <li><a href="#focus"><del class= "diff-old">3.5.2.</del> <ins class="diff-chg">3.5.2</ins> Focus</a> <ul class="toc"> <li><a href="#focus-management">3.5.2.1. Focus management</a></li> <li><a href="#sequential">3.5.2.2. Sequential focus navigation</a></li> </ul> </li> <li><a href="#scrolling"><del class= "diff-old">3.5.3.</del> <ins class="diff-chg">3.5.3</ins> Scrolling elements into view</a></li> </ul> </li> <li><a href="#the-root"><del class= "diff-old">3.6.</del> <ins class="diff-chg">3.6</ins> The root element</a> <ul class="toc"> <li><a href="#the-html"><del class= "diff-old">3.6.1.</del> <ins class="diff-chg">3.6.1</ins> The <code>html</code> element</a></li> </ul> </li> <li><a href="#document"><del class= "diff-old">3.7.</del> <ins class="diff-chg">3.7</ins> Document metadata</a> <ul class="toc"> <li><a href="#the-head"><del class= "diff-old">3.7.1.</del> <ins class="diff-chg">3.7.1</ins> The <code>head</code> element</a></li> <li><a href="#the-title0"><del class= "diff-old">3.7.2.</del> <ins class="diff-chg">3.7.2</ins> The <code>title</code> element</a></li> <li><a href="#the-base"><del class= "diff-old">3.7.3.</del> <ins class="diff-chg">3.7.3</ins> The <code>base</code> element</a></li> <li><a href="#the-link"><del class= "diff-old">3.7.4.</del> <ins class="diff-chg">3.7.4</ins> The <code>link</code> element</a></li> <li><a href="#meta"><del class= "diff-old">3.7.5.</del> <ins class="diff-chg">3.7.5</ins> The <code>meta</code> element</a> <ul class="toc"> <li><a href="#standard">3.7.5.1. Standard metadata names</a></li> <li><a href="#other">3.7.5.2. Other metadata names</a></li> <li><a href="#pragma">3.7.5.3. Pragma directives</a></li> <li><a href="#charset">3.7.5.4. Specifying the document's character encoding</a></li> </ul> </li> <li><a href="#the-style0"><del class= "diff-old">3.7.6.</del> <ins class="diff-chg">3.7.6</ins> The <code>style</code> element</a></li> <li><a href="#styling"><del class= "diff-old">3.7.7.</del> <ins class="diff-chg">3.7.7</ins> Styling</a></li> </ul> </li> <li><a href="#sections"><del class= "diff-old">3.8.</del> <ins class="diff-chg">3.8</ins> Sections</a> <ul class="toc"> <li><a href="#the-body"><del class= "diff-old">3.8.1.</del> <ins class="diff-chg">3.8.1</ins> The <code>body</code> element</a></li> <li><a href="#the-section"><del class= "diff-old">3.8.2.</del> <ins class="diff-chg">3.8.2</ins> The <code>section</code> element</a></li> <li><a href="#the-nav"><del class= "diff-old">3.8.3.</del> <ins class="diff-chg">3.8.3</ins> The <code>nav</code> element</a></li> <li><a href="#the-article"><del class= "diff-old">3.8.4.</del> <ins class="diff-chg">3.8.4</ins> The <code>article</code> element</a></li> <li><del class="diff-old">3.8.5. The blockquote element</del> <a href="#the-aside"><del class= "diff-old">3.8.6.</del> <ins class="diff-chg">3.8.5</ins> The <code>aside</code> element</a></li> <li><a href="#the-h1"><del class= "diff-old">3.8.7.</del> <ins class="diff-chg">3.8.6</ins> The <code>h1</code> , <code>h2</code> , <code>h3</code> , <code>h4</code> , <code>h5</code> , and <code>h6</code> elements</a></li> <li><a href="#the-header"><del class= "diff-old">3.8.8.</del> <ins class="diff-chg">3.8.7</ins> The <code>header</code> element</a></li> <li><a href="#the-footer"><del class= "diff-old">3.8.9.</del> <ins class="diff-chg">3.8.8</ins> The <code>footer</code> element</a></li> <li><a href="#the-address"><del class= "diff-old">3.8.10.</del> <ins class="diff-chg">3.8.9</ins> The <code>address</code> element</a></li> <li><a href="#headings"><del class= "diff-old">3.8.11.</del> <ins class="diff-chg">3.8.10</ins> Headings and sections</a> <ul class="toc"> <li><a href="#outlines"><del class= "diff-old">3.8.11.1.</del> <ins class= "diff-chg">3.8.10.1.</ins> Creating an outline</a></li> <li><del class="diff-old">3.8.11.2. Determining which heading and section applies to a particular node</del> <a href= "#distinguishing"><del class= "diff-old">3.8.11.3.</del> <ins class= "diff-chg">3.8.10.2.</ins> Distinguishing site-wide <del class="diff-old">headers</del> <ins class= "diff-chg">headings</ins> from page <del class= "diff-old">headers</del> <ins class= "diff-chg">headings</ins></a></li> </ul> </li> </ul> </li> <li><a href="#grouping"><del class= "diff-old">3.9.</del> <ins class="diff-chg">3.9</ins> <del class="diff-old">Prose</del> <ins class="diff-chg">Grouping content</ins></a> <ul class="toc"> <li><a href="#the-p"><del class= "diff-old">3.9.1.</del> <ins class="diff-chg">3.9.1</ins> The <code>p</code> element</a></li> <li><a href="#the-hr"><del class= "diff-old">3.9.2.</del> <ins class="diff-chg">3.9.2</ins> The <code>hr</code> element</a></li> <li><a href="#the-br"><del class= "diff-old">3.9.3.</del> <ins class="diff-chg">3.9.3</ins> The <code>br</code> element</a></li> <li><a href="#the-pre"><del class= "diff-old">3.9.4.</del> <ins class="diff-chg">3.9.4</ins> The <code><del class="diff-old">dialog</del> <ins class= "diff-chg">pre</ins></code> element</a> <del class="diff-old">3.10. Preformatted text</del></li> <li><a href="#the-dialog"><del class= "diff-old">3.10.1.</del> <ins class="diff-chg">3.9.5</ins> The <code><del class="diff-old">pre</del> <ins class= "diff-chg">dialog</ins></code> element</a></li> <li><a href="#the-blockquote"><del class= "diff-old">3.11.</del> <ins class="diff-chg">3.9.6</ins> <del class="diff-old">Lists</del> <ins class="diff-chg">The</ins> <code><ins class="diff-chg">blockquote</ins></code> <ins class= "diff-chg">element</ins></a></li> <li><a href="#the-ol"><del class= "diff-old">3.11.1.</del> <ins class="diff-chg">3.9.7</ins> The <code>ol</code> element</a></li> <li><a href="#the-ul"><del class= "diff-old">3.11.2.</del> <ins class="diff-chg">3.9.8</ins> The <code>ul</code> element</a></li> <li><a href="#the-li"><del class= "diff-old">3.11.3.</del> <ins class="diff-chg">3.9.9</ins> The <code>li</code> element</a></li> <li><a href="#the-dl"><del class= "diff-old">3.11.4.</del> <ins class="diff-chg">3.9.10</ins> The <code>dl</code> element</a></li> <li><a href="#the-dt"><del class= "diff-old">3.11.5.</del> <ins class="diff-chg">3.9.11</ins> The <code>dt</code> element</a></li> <li><a href="#the-dd"><del class= "diff-old">3.11.6.</del> <ins class="diff-chg">3.9.12</ins> The <code>dd</code> element</a></li> </ul> </li> <li><a href="#text-level"><del class= "diff-old">3.12.</del> <ins class="diff-chg">3.10</ins> <del class="diff-old">Phrase elements</del> <ins class= "diff-chg">Text-level semantics</ins></a> <ul class="toc"> <li><a href="#the-a"><del class= "diff-old">3.12.1.</del> <ins class="diff-chg">3.10.1</ins> The <code>a</code> element</a></li> <li><a href="#the-q"><del class= "diff-old">3.12.2.</del> <ins class="diff-chg">3.10.2</ins> The <code>q</code> element</a></li> <li><a href="#the-cite"><del class= "diff-old">3.12.3.</del> <ins class="diff-chg">3.10.3</ins> The <code>cite</code> element</a></li> <li><a href="#the-em"><del class= "diff-old">3.12.4.</del> <ins class="diff-chg">3.10.4</ins> The <code>em</code> element</a></li> <li><a href="#the-strong"><del class= "diff-old">3.12.5.</del> <ins class="diff-chg">3.10.5</ins> The <code>strong</code> element</a></li> <li><a href="#the-small"><del class= "diff-old">3.12.6.</del> <ins class="diff-chg">3.10.6</ins> The <code>small</code> element</a></li> <li><a href="#the-mark"><del class= "diff-old">3.12.7.</del> <ins class="diff-chg">3.10.7</ins> The <code><del class="diff-old">m</del> <ins class= "diff-chg">mark</ins></code> element</a></li> <li><a href="#the-dfn"><del class= "diff-old">3.12.8.</del> <ins class="diff-chg">3.10.8</ins> The <code>dfn</code> element</a></li> <li><a href="#the-abbr"><del class= "diff-old">3.12.9.</del> <ins class="diff-chg">3.10.9</ins> The <code>abbr</code> element</a></li> <li><a href="#the-time"><del class= "diff-old">3.12.10.</del> <ins class= "diff-chg">3.10.10</ins> The <code>time</code> element</a></li> <li><a href="#the-progress"><del class= "diff-old">3.12.11.</del> <ins class= "diff-chg">3.10.11</ins> The <code>progress</code> element</a></li> <li><a href="#the-meter"><del class= "diff-old">3.12.12.</del> <ins class= "diff-chg">3.10.12</ins> The <code>meter</code> element</a></li> <li><a href="#the-code"><del class= "diff-old">3.12.13.</del> <ins class= "diff-chg">3.10.13</ins> The <code>code</code> element</a></li> <li><a href="#the-var"><del class= "diff-old">3.12.14.</del> <ins class= "diff-chg">3.10.14</ins> The <code>var</code> element</a></li> <li><a href="#the-samp"><del class= "diff-old">3.12.15.</del> <ins class= "diff-chg">3.10.15</ins> The <code>samp</code> element</a></li> <li><a href="#the-kbd"><del class= "diff-old">3.12.16.</del> <ins class= "diff-chg">3.10.16</ins> The <code>kbd</code> element</a></li> <li><a href="#the-sub"><del class= "diff-old">3.12.17.</del> <ins class= "diff-chg">3.10.17</ins> The <code>sub</code> and <code>sup</code> elements</a></li> <li><a href="#the-span"><del class= "diff-old">3.12.18.</del> <ins class= "diff-chg">3.10.18</ins> The <code>span</code> element</a></li> <li><a href="#the-i"><del class= "diff-old">3.12.19.</del> <ins class= "diff-chg">3.10.19</ins> The <code>i</code> element</a></li> <li><a href="#the-b"><del class= "diff-old">3.12.20.</del> <ins class= "diff-chg">3.10.20</ins> The <code>b</code> element</a></li> <li><a href="#the-bdo"><del class= "diff-old">3.12.21.</del> <ins class= "diff-chg">3.10.21</ins> The <code>bdo</code> element</a></li> <li><a href="#the-ruby"><ins class= "diff-new">3.10.22</ins> <ins class="diff-new">The</ins> <code><ins class="diff-new">ruby</ins></code> <ins class= "diff-new">element</ins></a></li> <li><a href="#the-rt"><ins class= "diff-new">3.10.23</ins> <ins class="diff-new">The</ins> <code><ins class="diff-new">rt</ins></code> <ins class= "diff-new">element</ins></a></li> <li><a href="#the-rp"><ins class= "diff-new">3.10.24</ins> <ins class="diff-new">The</ins> <code><ins class="diff-new">rp</ins></code> <ins class= "diff-new">element</ins></a></li> <li><a href="#usage"><ins class= "diff-new">3.10.25</ins> <ins class="diff-new">Usage summary</ins></a></li> <li><a href="#footnotes"><ins class= "diff-new">3.10.26</ins> <ins class= "diff-new">Footnotes</ins></a></li> </ul> </li> <li><a href="#edits"><del class= "diff-old">3.13.</del> <ins class="diff-chg">3.11</ins> Edits</a> <ul class="toc"> <li><a href="#the-ins"><del class= "diff-old">3.13.1.</del> <ins class="diff-chg">3.11.1</ins> The <code>ins</code> element</a></li> <li><a href="#the-del"><del class= "diff-old">3.13.2.</del> <ins class="diff-chg">3.11.2</ins> The <code>del</code> element</a></li> <li><a href="#attributes"><del class= "diff-old">3.13.3.</del> <ins class="diff-chg">3.11.3</ins> Attributes common to <code>ins</code> and <code>del</code> elements</a></li> <li><a href="#edits0"><ins class= "diff-new">3.11.4</ins> <ins class="diff-new">Edits and paragraphs</ins></a></li> <li><a href="#edits1"><ins class= "diff-new">3.11.5</ins> <ins class="diff-new">Edits and lists</ins></a></li> </ul> </li> <li><a href="#embedded0"><del class= "diff-old">3.14.</del> <ins class="diff-chg">3.12</ins> Embedded content</a> <ul class="toc"> <li><a href="#the-figure"><del class= "diff-old">3.14.1.</del> <ins class="diff-chg">3.12.1</ins> The <code>figure</code> element</a></li> <li><a href="#the-img"><del class= "diff-old">3.14.2.</del> <ins class="diff-chg">3.12.2</ins> The <code>img</code> element</a></li> <li><a href="#the-iframe"><del class= "diff-old">3.14.3.</del> <ins class="diff-chg">3.12.3</ins> The <code>iframe</code> element</a></li> <li><a href="#the-embed"><del class= "diff-old">3.14.4.</del> <ins class="diff-chg">3.12.4</ins> The <code>embed</code> element</a></li> <li><a href="#the-object"><del class= "diff-old">3.14.5.</del> <ins class="diff-chg">3.12.5</ins> The <code>object</code> element</a></li> <li><a href="#the-param"><del class= "diff-old">3.14.6.</del> <ins class="diff-chg">3.12.6</ins> The <code>param</code> element</a></li> <li><a href="#video"><del class= "diff-old">3.14.7.</del> <ins class="diff-chg">3.12.7</ins> The <code>video</code> element</a> <ul class="toc"> <li><a href="#video0"><del class= "diff-old">3.14.7.1.</del> <ins class= "diff-chg">3.12.7.1.</ins> Video and audio codecs for <code>video</code> elements</a></li> </ul> </li> <li><a href="#audio"><del class= "diff-old">3.14.8.</del> <ins class="diff-chg">3.12.8</ins> The <code>audio</code> element</a> <ul class="toc"> <li><a href="#audio0"><del class= "diff-old">3.14.8.1.</del> <ins class= "diff-chg">3.12.8.1.</ins> Audio codecs for <code>audio</code> elements</a></li> </ul> </li> <li><a href="#the-source"><ins class= "diff-new">3.12.9</ins> <ins class="diff-new">The</ins> <code><ins class="diff-new">source</ins></code> <ins class= "diff-new">element</ins></a></li> <li><a href="#media"><del class= "diff-old">3.14.9.</del> <ins class="diff-chg">3.12.10</ins> Media elements</a> <ul class="toc"> <li><a href="#error"><del class= "diff-old">3.14.9.1.</del> <ins class= "diff-chg">3.12.10.1.</ins> Error codes</a></li> <li><a href="#location"><del class= "diff-old">3.14.9.2.</del> <ins class= "diff-chg">3.12.10.2.</ins> Location of the media resource</a></li> <li><a href="#network0"><del class= "diff-old">3.14.9.3.</del> <ins class= "diff-chg">3.12.10.3.</ins> Network states</a></li> <li><a href="#loading"><del class= "diff-old">3.14.9.4.</del> <ins class= "diff-chg">3.12.10.4.</ins> Loading the media resource</a></li> <li><a href="#offsets"><del class= "diff-old">3.14.9.5.</del> <ins class= "diff-chg">3.12.10.5.</ins> Offsets into the media resource</a></li> <li><a href="#the-ready"><del class= "diff-old">3.14.9.6.</del> <ins class= "diff-chg">3.12.10.6.</ins> The ready states</a></li> <li><a href="#playing"><del class= "diff-old">3.14.9.7.</del> <ins class= "diff-chg">3.12.10.7.</ins> Playing the media resource</a></li> <li><a href="#seeking"><del class= "diff-old">3.14.9.8.</del> <ins class= "diff-chg">3.12.10.8.</ins> Seeking</a></li> <li><a href="#cue-ranges"><del class= "diff-old">3.14.9.9.</del> <ins class= "diff-chg">3.12.10.9.</ins> Cue ranges</a></li> <li><a href="#user-interface"><del class= "diff-old">3.14.9.10.</del> <ins class= "diff-chg">3.12.10.10.</ins> User interface</a></li> <li><a href="#time-ranges"><del class= "diff-old">3.14.9.11.</del> <ins class= "diff-chg">3.12.10.11.</ins> Time <del class= "diff-old">range</del> <ins class="diff-chg">ranges</ins></a></li> <li><a href="#byte-ranges"><ins class= "diff-chg">3.12.10.12.</ins> <ins class="diff-chg">Byte ranges</ins></a></li> <li><a href="#mediaevents"><del class= "diff-old">3.14.9.12.</del> <ins class= "diff-chg">3.12.10.13.</ins> Event summary</a></li> <li><a href="#security0"><del class= "diff-old">3.14.9.13.</del> <ins class= "diff-chg">3.12.10.14.</ins> Security and privacy considerations</a></li> </ul> </li> <li><del class="diff-old">3.14.10. The source element</del> <a href="#the-canvas"><del class= "diff-old">3.14.11.</del> <ins class= "diff-chg">3.12.11</ins> The <code>canvas</code> element</a> <ul class="toc"> <li><a href="#the-2d"><del class= "diff-old">3.14.11.1.</del> <ins class= "diff-chg">3.12.11.1.</ins> The 2D context</a> <ul class="toc"> <li><a href="#the-canvas0"><del class= "diff-old">3.14.11.1.1.</del> <ins class= "diff-chg">3.12.11.1.1.</ins> The canvas state</a></li> <li><a href="#transformations"><del class= "diff-old">3.14.11.1.2.</del> <ins class= "diff-chg">3.12.11.1.2.</ins> Transformations</a></li> <li><a href="#compositing"><del class= "diff-old">3.14.11.1.3.</del> <ins class= "diff-chg">3.12.11.1.3.</ins> Compositing</a></li> <li><a href="#colors"><del class= "diff-old">3.14.11.1.4.</del> <ins class= "diff-chg">3.12.11.1.4.</ins> Colors and styles</a></li> <li><a href="#line-styles"><del class= "diff-old">3.14.11.1.5.</del> <ins class= "diff-chg">3.12.11.1.5.</ins> Line styles</a></li> <li><a href="#shadows"><del class= "diff-old">3.14.11.1.6.</del> <ins class= "diff-chg">3.12.11.1.6.</ins> Shadows</a></li> <li><a href="#simple"><del class= "diff-old">3.14.11.1.7.</del> <ins class= "diff-chg">3.12.11.1.7.</ins> Simple shapes (rectangles)</a></li> <li><a href="#complex"><del class= "diff-old">3.14.11.1.8.</del> <ins class= "diff-chg">3.12.11.1.8.</ins> Complex shapes (paths)</a></li> <li><a href="#text"><ins class= "diff-new">3.12.11.1.9.</ins> <ins class= "diff-new">Text</ins></a></li> <li><a href="#images"><del class= "diff-old">3.14.11.1.9.</del> <ins class= "diff-chg">3.12.11.1.10.</ins> Images</a></li> <li><a href="#pixel"><del class= "diff-old">3.14.11.1.10.</del> <ins class= "diff-chg">3.12.11.1.11.</ins> Pixel manipulation</a></li> <li><a href="#drawing"><del class= "diff-old">3.14.11.1.11.</del> <ins class= "diff-chg">3.12.11.1.12.</ins> Drawing model</a></li> </ul> </li> <li><a href="#color"><del class= "diff-old">3.14.11.2.</del> <ins class= "diff-chg">3.12.11.2.</ins> Color spaces and color correction</a></li> <li><a href="#security1"><ins class= "diff-new">3.12.11.3.</ins> <ins class="diff-new">Security with</ins> <code><ins class="diff-new">canvas</ins></code> <ins class="diff-new">elements</ins></a></li> </ul> </li> <li><a href="#the-map"><del class= "diff-old">3.14.12.</del> <ins class= "diff-chg">3.12.12</ins> The <code>map</code> element</a></li> <li><a href="#the-area"><del class= "diff-old">3.14.13.</del> <ins class= "diff-chg">3.12.13</ins> The <code>area</code> element</a></li> <li><a href="#image-maps"><del class= "diff-old">3.14.14.</del> <ins class= "diff-chg">3.12.14</ins> Image maps</a></li> <li><a href="#mathml"><ins class= "diff-new">3.12.15</ins> <ins class= "diff-new">MathML</ins></a></li> <li><a href="#svg"><ins class= "diff-new">3.12.16</ins> <ins class= "diff-new">SVG</ins></a></li> <li><a href="#dimension"><del class= "diff-old">3.14.15.</del> <ins class= "diff-chg">3.12.17</ins> Dimension attributes</a></li> </ul> </li> <li><a href="#tabular"><del class= "diff-old">3.15.</del> <ins class="diff-chg">3.13</ins> Tabular data</a> <ul class="toc"> <li><a href="#table-intro"><ins class= "diff-new">3.13.1</ins> <ins class= "diff-new">Introduction</ins></a></li> <li><a href="#the-table"><del class= "diff-old">3.15.1.</del> <ins class="diff-chg">3.13.2</ins> The <code>table</code> element</a></li> <li><a href="#the-caption"><del class= "diff-old">3.15.2.</del> <ins class="diff-chg">3.13.3</ins> The <code>caption</code> element</a></li> <li><a href="#the-colgroup"><del class= "diff-old">3.15.3.</del> <ins class="diff-chg">3.13.4</ins> The <code>colgroup</code> element</a></li> <li><a href="#the-col"><del class= "diff-old">3.15.4.</del> <ins class="diff-chg">3.13.5</ins> The <code>col</code> element</a></li> <li><a href="#the-tbody"><del class= "diff-old">3.15.5.</del> <ins class="diff-chg">3.13.6</ins> The <code>tbody</code> element</a></li> <li><a href="#the-thead"><del class= "diff-old">3.15.6.</del> <ins class="diff-chg">3.13.7</ins> The <code>thead</code> element</a></li> <li><a href="#the-tfoot"><del class= "diff-old">3.15.7.</del> <ins class="diff-chg">3.13.8</ins> The <code>tfoot</code> element</a></li> <li><a href="#the-tr"><del class= "diff-old">3.15.8.</del> <ins class="diff-chg">3.13.9</ins> The <code>tr</code> element</a></li> <li><a href="#the-td"><del class= "diff-old">3.15.9.</del> <ins class="diff-chg">3.13.10</ins> The <code>td</code> element</a></li> <li><a href="#the-th"><del class= "diff-old">3.15.10.</del> <ins class= "diff-chg">3.13.11</ins> The <code>th</code> element</a></li> <li><a href="#attributes0"><ins class= "diff-new">3.13.12</ins> <ins class="diff-new">Attributes common to</ins> <code><ins class="diff-new">td</ins></code> <ins class="diff-new">and</ins> <code><ins class= "diff-new">th</ins></code> <ins class= "diff-new">elements</ins></a></li> <li><a href="#processing"><del class= "diff-old">3.15.11.</del> <ins class= "diff-chg">3.13.13</ins> Processing model</a> <ul class="toc"> <li><a href="#forming"><del class= "diff-old">3.15.11.1.</del> <ins class= "diff-chg">3.13.13.1.</ins> Forming a table</a></li> <li><a href="#header-and-data-cell-semantics"><del class="diff-old">3.15.11.2.</del> <ins class= "diff-chg">3.13.13.2.</ins> Forming relationships between data cells and header cells</a></li> </ul> </li> </ul> </li> <li><a href="#forms"><del class= "diff-old">3.16.</del> <ins class="diff-chg">3.14</ins> Forms</a> <ul class="toc"> <li><a href="#the-form"><del class= "diff-old">3.16.1.</del> <ins class="diff-chg">3.14.1</ins> The <code>form</code> element</a></li> <li><a href="#the-fieldset"><del class= "diff-old">3.16.2.</del> <ins class="diff-chg">3.14.2</ins> The <code>fieldset</code> element</a></li> <li><a href="#the-input"><del class= "diff-old">3.16.3.</del> <ins class="diff-chg">3.14.3</ins> The <code>input</code> element</a></li> <li><a href="#the-button"><del class= "diff-old">3.16.4.</del> <ins class="diff-chg">3.14.4</ins> The <code>button</code> element</a></li> <li><a href="#the-label"><del class= "diff-old">3.16.5.</del> <ins class="diff-chg">3.14.5</ins> The <code>label</code> element</a></li> <li><a href="#the-select"><del class= "diff-old">3.16.6.</del> <ins class="diff-chg">3.14.6</ins> The <code>select</code> element</a></li> <li><a href="#the-datalist"><del class= "diff-old">3.16.7.</del> <ins class="diff-chg">3.14.7</ins> The <code>datalist</code> element</a></li> <li><a href="#the-optgroup"><del class= "diff-old">3.16.8.</del> <ins class="diff-chg">3.14.8</ins> The <code>optgroup</code> element</a></li> <li><a href="#the-option"><del class= "diff-old">3.16.9.</del> <ins class="diff-chg">3.14.9</ins> The <code>option</code> element</a></li> <li><a href="#the-textarea"><del class= "diff-old">3.16.10.</del> <ins class= "diff-chg">3.14.10</ins> The <code>textarea</code> element</a></li> <li><a href="#the-output"><del class= "diff-old">3.16.11.</del> <ins class= "diff-chg">3.14.11</ins> The <code>output</code> element</a></li> <li><a href="#processing0"><del class= "diff-old">3.16.12.</del> <ins class= "diff-chg">3.14.12</ins> Processing model</a> <ul class="toc"> <li><a href="#form-submission"><del class= "diff-old">3.16.12.1.</del> <ins class= "diff-chg">3.14.12.1.</ins> Form submission</a></li> </ul> </li> </ul> </li> <li><a href="#scripting0"><del class= "diff-old">3.17.</del> <ins class="diff-chg">3.15</ins> Scripting</a> <ul class="toc"> <li><a href="#script"><del class= "diff-old">3.17.1.</del> <ins class="diff-chg">3.15.1</ins> The <code>script</code> element</a> <ul class="toc"> <li><a href="#scriptingLanguages"><del class= "diff-old">3.17.1.1.</del> <ins class= "diff-chg">3.15.1.1.</ins> Scripting languages</a></li> </ul> </li> <li><a href="#the-noscript"><del class= "diff-old">3.17.2.</del> <ins class="diff-chg">3.15.2</ins> The <code>noscript</code> element</a></li> <li><a href="#the-event-source"><del class= "diff-old">3.17.3.</del> <ins class="diff-chg">3.15.3</ins> The <code>event-source</code> element</a></li> </ul> </li> <li><a href="#interactive-elements"><del class= "diff-old">3.18.</del> <ins class="diff-chg">3.16</ins> Interactive elements</a> <ul class="toc"> <li><a href="#the-details"><del class= "diff-old">3.18.1.</del> <ins class="diff-chg">3.16.1</ins> The <code>details</code> element</a></li> <li><a href="#datagrid"><del class= "diff-old">3.18.2.</del> <ins class="diff-chg">3.16.2</ins> The <code>datagrid</code> element</a> <ul class="toc"> <li><a href="#the-datagrid"><del class= "diff-old">3.18.2.1.</del> <ins class= "diff-chg">3.16.2.1.</ins> The <code>datagrid</code> data model</a></li> <li><a href="#how-rows"><del class= "diff-old">3.18.2.2.</del> <ins class= "diff-chg">3.16.2.2.</ins> How rows are identified</a></li> <li><a href="#the-data"><del class= "diff-old">3.18.2.3.</del> <ins class= "diff-chg">3.16.2.3.</ins> The data provider interface</a></li> <li><a href="#the-default"><del class= "diff-old">3.18.2.4.</del> <ins class= "diff-chg">3.16.2.4.</ins> The default data provider</a> <ul class="toc"> <li><a href="#commonDefaultDataGridMethodDefinitions"><del class="diff-old">3.18.2.4.1.</del> <ins class= "diff-chg">3.16.2.4.1.</ins> Common default data provider method definitions for cells</a></li> </ul> </li> <li><a href="#populating"><del class= "diff-old">3.18.2.5.</del> <ins class= "diff-chg">3.16.2.5.</ins> Populating the <code>datagrid</code> element</a></li> <li><a href="#updating"><del class= "diff-old">3.18.2.6.</del> <ins class= "diff-chg">3.16.2.6.</ins> Updating the <code>datagrid</code></a></li> <li><a href="#requirements"><del class= "diff-old">3.18.2.7.</del> <ins class= "diff-chg">3.16.2.7.</ins> Requirements for interactive user agents</a></li> <li><a href="#the-selection"><del class= "diff-old">3.18.2.8.</del> <ins class= "diff-chg">3.16.2.8.</ins> The selection</a></li> <li><a href="#columns"><del class= "diff-old">3.18.2.9.</del> <ins class= "diff-chg">3.16.2.9.</ins> Columns and captions</a></li> </ul> </li> <li><a href="#the-command"><del class= "diff-old">3.18.3.</del> <ins class="diff-chg">3.16.3</ins> The <code>command</code> element</a></li> <li><a href="#menus"><del class= "diff-old">3.18.4.</del> <ins class="diff-chg">3.16.4</ins> The <code>menu</code> element</a> <ul class="toc"> <li><a href="#menus-intro"><del class= "diff-old">3.18.4.1.</del> <ins class= "diff-chg">3.16.4.1.</ins> Introduction</a></li> <li><a href="#building"><del class= "diff-old">3.18.4.2.</del> <ins class= "diff-chg">3.16.4.2.</ins> Building menus and tool bars</a></li> <li><a href="#context"><del class= "diff-old">3.18.4.3.</del> <ins class= "diff-chg">3.16.4.3.</ins> Context menus</a></li> <li><a href="#toolbars"><del class= "diff-old">3.18.4.4.</del> <ins class= "diff-chg">3.16.4.4.</ins> Toolbars</a></li> </ul> </li> <li><a href="#commands"><del class= "diff-old">3.18.5.</del> <ins class="diff-chg">3.16.5</ins> Commands</a> <ul class="toc"> <li><a href="#using"><del class= "diff-old">3.18.5.1.</del> <ins class= "diff-chg">3.16.5.1.</ins> Using the <code>a</code> element to define a command</a></li> <li><a href="#using0"><del class= "diff-old">3.18.5.2.</del> <ins class= "diff-chg">3.16.5.2.</ins> Using the <code>button</code> element to define a command</a></li> <li><a href="#using1"><del class= "diff-old">3.18.5.3.</del> <ins class= "diff-chg">3.16.5.3.</ins> Using the <code>input</code> element to define a command</a></li> <li><a href="#using2"><del class= "diff-old">3.18.5.4.</del> <ins class= "diff-chg">3.16.5.4.</ins> Using the <code>option</code> element to define a command</a></li> <li><a href="#using3"><del class= "diff-old">3.18.5.5.</del> <ins class= "diff-chg">3.16.5.5.</ins> Using the <code>command</code> element to define a command</a></li> </ul> </li> </ul> </li> <li><a href="#datatemplate"><del class= "diff-old">3.19.</del> <ins class="diff-chg">3.17</ins> Data Templates</a> <ul class="toc"> <li><a href="#introduction0"><del class= "diff-old">3.19.1.</del> <ins class="diff-chg">3.17.1</ins> Introduction</a></li> <li><a href="#the-datatemplate"><del class= "diff-old">3.19.2.</del> <ins class="diff-chg">3.17.2</ins> The <code>datatemplate</code> element</a></li> <li><a href="#the-rule"><del class= "diff-old">3.19.3.</del> <ins class="diff-chg">3.17.3</ins> The <code>rule</code> element</a></li> <li><a href="#the-nest"><del class= "diff-old">3.19.4.</del> <ins class="diff-chg">3.17.4</ins> The <code>nest</code> element</a></li> <li><a href="#global0"><del class= "diff-old">3.19.5.</del> <ins class="diff-chg">3.17.5</ins> Global attributes for data templates</a></li> <li><a href="#processing1"><del class= "diff-old">3.19.6.</del> <ins class="diff-chg">3.17.6</ins> Processing model</a> <ul class="toc"> <li><a href="#the-originalcontent"><del class= "diff-old">3.19.6.1.</del> <ins class= "diff-chg">3.17.6.1.</ins> The <code title= "dom-originalContent">originalContent</code> DOM attribute</a></li> <li><a href="#the-template"><del class= "diff-old">3.19.6.2.</del> <ins class= "diff-chg">3.17.6.2.</ins> The <code title= "attr-template">template</code> attribute</a></li> <li><a href="#the-ref"><del class= "diff-old">3.19.6.3.</del> <ins class= "diff-chg">3.17.6.3.</ins> The <code title= "attr-ref">ref</code> attribute</a></li> <li><a href="#the-nodedatatemplate"><del class= "diff-old">3.19.6.4.</del> <ins class= "diff-chg">3.17.6.4.</ins> The <code>NodeDataTemplate</code> interface</a></li> <li><a href="#mutations"><del class= "diff-old">3.19.6.5.</del> <ins class= "diff-chg">3.17.6.5.</ins> Mutations</a></li> <li><a href="#updating0"><del class= "diff-old">3.19.6.6.</del> <ins class= "diff-chg">3.17.6.6.</ins> Updating the generated content</a></li> </ul> </li> </ul> </li> <li><a href="#miscellaneous"><del class= "diff-old">3.20.</del> <ins class="diff-chg">3.18</ins> Miscellaneous elements</a> <ul class="toc"> <li><a href="#the-legend"><del class= "diff-old">3.20.1.</del> <ins class="diff-chg">3.18.1</ins> The <code>legend</code> element</a></li> <li><a href="#the-div"><del class= "diff-old">3.20.2.</del> <ins class="diff-chg">3.18.2</ins> The <code>div</code> element</a></li> </ul> </li> </ul> </li> <li><a href="#web-browsers">4. Web browsers</a> <ul class="toc"> <li><a href="#windows"><del class= "diff-old">4.1.</del> <ins class="diff-chg">4.1</ins> Browsing contexts</a> <ul class="toc"> <li><a href="#nested"><del class= "diff-old">4.1.1.</del> <ins class="diff-chg">4.1.1</ins> Nested browsing contexts</a></li> <li><a href="#auxiliary"><del class= "diff-old">4.1.2.</del> <ins class="diff-chg">4.1.2</ins> Auxiliary browsing contexts</a></li> <li><a href="#secondary"><del class= "diff-old">4.1.3.</del> <ins class="diff-chg">4.1.3</ins> Secondary browsing contexts</a></li> <li><a href="#security2"><ins class= "diff-new">4.1.4</ins> <ins class= "diff-new">Security</ins></a></li> <li><a href="#threads"><del class= "diff-old">4.1.4.</del> <ins class="diff-chg">4.1.5</ins> Threads</a></li> <li><a href="#browsing"><del class= "diff-old">4.1.5.</del> <ins class="diff-chg">4.1.6</ins> Browsing context names</a></li> </ul> </li> <li><a href="#the-default0"><del class= "diff-old">4.2.</del> <ins class="diff-chg">4.2</ins> The default view</a> <ul class="toc"> <li><a href="#security3"><del class= "diff-old">4.2.1.</del> <ins class="diff-chg">4.2.1</ins> Security</a></li> <li><a href="#constructors"><del class= "diff-old">4.2.2.</del> <ins class="diff-chg">4.2.2</ins> Constructors</a></li> <li><a href="#apis-for"><del class= "diff-old">4.2.3.</del> <ins class="diff-chg">4.2.3</ins> APIs for creating and navigating browsing contexts by name</a></li> <li><a href="#accessing"><del class= "diff-old">4.2.4.</del> <ins class="diff-chg">4.2.4</ins> Accessing other browsing contexts</a></li> </ul> </li> <li><a href="#origin"><del class= "diff-old">4.3.</del> <ins class="diff-chg">4.3</ins> <del class="diff-old">Scripting</del> <ins class= "diff-chg">Origin</ins></a> <ul class="toc"> <li><a href="#relaxing"><del class= "diff-old">4.3.1.</del> <ins class="diff-chg">4.3.1</ins> <del class="diff-old">Running executable code</del> <ins class= "diff-chg">Relaxing the same-origin restriction</ins></a></li> <li><a href="#the-string"><del class= "diff-old">4.3.2.</del> <ins class="diff-chg">4.3.2</ins> <del class="diff-old">Origin</del> <ins class="diff-chg">The string representing the script's domain in IDNA format</ins></a></li> </ul> </li> <li><a href="#scripting"><del class= "diff-old">4.3.3.</del> <ins class="diff-chg">4.4</ins> <del class="diff-old">Unscripted same-origin checks</del> <ins class="diff-chg">Scripting</ins></a> <ul class="toc"> <li><a href="#script0"><del class= "diff-old">4.3.4.</del> <ins class="diff-chg">4.4.1</ins> <ins class="diff-chg">Script execution contexts</ins></a></li> <li><a href="#security4"><ins class= "diff-chg">4.4.2</ins> Security exceptions</a></li> <li><a href="#javascript-protocol"><del class= "diff-old">4.3.5.</del> <ins class="diff-chg">4.4.3</ins> The <code title="">javascript:</code> protocol</a></li> <li><a href="#events"><del class= "diff-old">4.3.6.</del> <ins class="diff-chg">4.4.4</ins> Events</a> <ul class="toc"> <li><a href="#event-handler-attributes"><del class="diff-old">4.3.6.1.</del> <ins class= "diff-chg">4.4.4.1.</ins> Event handler attributes</a></li> <li><a href="#event"><del class= "diff-old">4.3.6.2.</del> <ins class= "diff-chg">4.4.4.2.</ins> Event firing</a></li> <li><a href="#events0"><del class= "diff-old">4.3.6.3.</del> <ins class= "diff-chg">4.4.4.3.</ins> Events and the <code>Window</code> object</a></li> <li><a href="#runtime-script-errors"><del class="diff-old">4.3.6.4.</del> <ins class= "diff-chg">4.4.4.4.</ins> Runtime script errors</a></li> </ul> </li> </ul> </li> <li><a href="#user-prompts"><del class= "diff-old">4.4.</del> <ins class="diff-chg">4.5</ins> User prompts</a> <ul class="toc"> <li><a href="#simple0"><ins class= "diff-new">4.5.1</ins> <ins class="diff-new">Simple dialogs</ins></a></li> <li><a href="#printing"><ins class= "diff-new">4.5.2</ins> <ins class= "diff-new">Printing</ins></a></li> <li><a href="#dialogs"><ins class= "diff-new">4.5.3</ins> <ins class="diff-new">Dialogs implemented using separate documents</ins></a></li> <li><a href="#notifications"><ins class= "diff-new">4.5.4</ins> <ins class= "diff-new">Notifications</ins></a></li> </ul> </li> <li><a href="#browser"><del class= "diff-old">4.5.</del> <ins class="diff-chg">4.6</ins> Browser state</a> <ul class="toc"> <li><a href="#custom-handlers"><del class= "diff-old">4.5.1.</del> <ins class="diff-chg">4.6.1</ins> Custom protocol and content handlers</a> <ul class="toc"> <li><a href="#security5"><del class= "diff-old">4.5.1.1.</del> <ins class= "diff-chg">4.6.1.1.</ins> Security and privacy</a></li> <li><a href="#sample-handler-impl"><del class= "diff-old">4.5.1.2.</del> <ins class= "diff-chg">4.6.1.2.</ins> Sample user interface</a></li> </ul> </li> </ul> </li> <li><a href="#offline"><del class= "diff-old">4.6.</del> <ins class="diff-chg">4.7</ins> Offline Web applications</a> <ul class="toc"> <li><a href="#introduction1"><del class= "diff-old">4.6.1.</del> <ins class="diff-chg">4.7.1</ins> Introduction</a></li> <li><a href="#appcache"><del class= "diff-old">4.6.2.</del> <ins class="diff-chg">4.7.2</ins> Application caches</a></li> <li><a href="#manifests"><del class= "diff-old">4.6.3.</del> <ins class="diff-chg">4.7.3</ins> The cache manifest syntax</a> <ul class="toc"> <li><a href="#writing"><del class= "diff-old">4.6.3.1.</del> <ins class= "diff-chg">4.7.3.1.</ins> Writing cache manifests</a></li> <li><a href="#parsing0"><del class= "diff-old">4.6.3.2.</del> <ins class= "diff-chg">4.7.3.2.</ins> Parsing cache manifests</a></li> </ul> </li> <li><a href="#updating1"><del class= "diff-old">4.6.4.</del> <ins class="diff-chg">4.7.4</ins> Updating an application cache</a></li> <li><a href="#processing2"><del class= "diff-old">4.6.5.</del> <ins class="diff-chg">4.7.5</ins> Processing model</a> <ul class="toc"> <li><a href="#changes"><del class= "diff-old">4.6.5.1.</del> <ins class= "diff-chg">4.7.5.1.</ins> Changes to the networking model</a></li> </ul> </li> <li><a href="#application"><del class= "diff-old">4.6.6.</del> <ins class="diff-chg">4.7.6</ins> Application cache API</a></li> <li><a href="#browser0"><del class= "diff-old">4.6.7.</del> <ins class="diff-chg">4.7.7</ins> Browser state</a></li> </ul> </li> <li><a href="#history"><del class= "diff-old">4.7.</del> <ins class="diff-chg">4.8</ins> Session history and navigation</a> <ul class="toc"> <li><a href="#the-session"><del class= "diff-old">4.7.1.</del> <ins class="diff-chg">4.8.1</ins> The session history of browsing contexts</a></li> <li><a href="#the-history"><del class= "diff-old">4.7.2.</del> <ins class="diff-chg">4.8.2</ins> The <code>History</code> interface</a></li> <li><a href="#activating"><del class= "diff-old">4.7.3.</del> <ins class="diff-chg">4.8.3</ins> Activating state <del class="diff-old">objects</del> <ins class= "diff-chg">object entries</ins></a></li> <li><a href="#the-location"><del class= "diff-old">4.7.4.</del> <ins class="diff-chg">4.8.4</ins> The <code>Location</code> interface</a> <ul class="toc"> <li><a href="#security6"><del class= "diff-old">4.7.4.1.</del> <ins class= "diff-chg">4.8.4.1.</ins> Security</a></li> </ul> </li> <li><a href="#history-notes"><del class= "diff-old">4.7.5.</del> <ins class="diff-chg">4.8.5</ins> Implementation notes for session history</a></li> </ul> </li> <li><a href="#browsing0"><ins class= "diff-new">4.9</ins> <ins class="diff-new">Browsing the Web</ins></a> <ul class="toc"> <li><a href="#navigating"><del class= "diff-old">4.8.</del> <ins class="diff-chg">4.9.1</ins> Navigating across documents</a></li> <li><a href="#read-html"><del class= "diff-old">4.8.1.</del> <ins class="diff-chg">4.9.2</ins> Page load processing model for HTML files</a></li> <li><a href="#read-xml"><del class= "diff-old">4.8.2.</del> <ins class="diff-chg">4.9.3</ins> Page load processing model for XML files</a></li> <li><a href="#read-text"><del class= "diff-old">4.8.3.</del> <ins class="diff-chg">4.9.4</ins> Page load processing model for text files</a></li> <li><a href="#read-image"><del class= "diff-old">4.8.4.</del> <ins class="diff-chg">4.9.5</ins> Page load processing model for images</a></li> <li><a href="#read-plugin"><del class= "diff-old">4.8.5.</del> <ins class="diff-chg">4.9.6</ins> Page load processing model for content that uses plugins</a></li> <li><a href="#read-ua-inline"><del class= "diff-old">4.8.6.</del> <ins class="diff-chg">4.9.7</ins> Page load processing model for inline content that doesn't have a DOM</a></li> <li><a href="#scroll-to-fragid"><del class= "diff-old">4.8.7.</del> <ins class="diff-chg">4.9.8</ins> Navigating to a fragment identifier</a></li> <li><a href="#history0"><ins class= "diff-new">4.9.9</ins> <ins class="diff-new">History traversal</ins></a></li> </ul> </li> <li><a href="#content-type-sniffing"><del class="diff-old">4.9.</del> <ins class= "diff-chg">4.10</ins> Determining the type of a new resource in a browsing context</a> <ul class="toc"> <li><a href="#content-type0"><del class= "diff-old">4.9.1.</del> <ins class="diff-chg">4.10.1</ins> Content-Type sniffing: text or binary</a></li> <li><a href="#content-type1"><del class= "diff-old">4.9.2.</del> <ins class="diff-chg">4.10.2</ins> Content-Type sniffing: unknown type</a></li> <li><a href="#content-type2"><del class= "diff-old">4.9.3.</del> <ins class="diff-chg">4.10.3</ins> Content-Type sniffing: image</a></li> <li><a href="#content-type3"><del class= "diff-old">4.9.4.</del> <ins class="diff-chg">4.10.4</ins> Content-Type sniffing: feed or HTML</a></li> <li><a href="#content-type"><del class= "diff-old">4.9.5.</del> <ins class="diff-chg">4.10.5</ins> Content-Type metadata</a></li> </ul> </li> <li><a href="#structured"><del class= "diff-old">4.10.</del> <ins class="diff-chg">4.11</ins> <del class="diff-old">Client-side session and persistent</del> <ins class="diff-chg">Structured client-side</ins> storage <del class="diff-old">of</del></a> <ul class="toc"> <li><a href="#storage"><ins class= "diff-chg">4.11.1</ins> <ins class="diff-chg">Storing</ins> name/value pairs</a> <ul class="toc"> <li><a href="#introduction2"><del class= "diff-old">4.10.1.</del> <ins class= "diff-chg">4.11.1.1.</ins> Introduction</a></li> <li><a href="#the-storage"><del class= "diff-old">4.10.2.</del> <ins class= "diff-chg">4.11.1.2.</ins> The <code>Storage</code> interface</a></li> <li><a href="#the-sessionstorage"><del class= "diff-old">4.10.3.</del> <ins class= "diff-chg">4.11.1.3.</ins> The <code title= "dom-sessionStorage">sessionStorage</code> attribute</a></li> <li><a href="#the-localstorage"><del class= "diff-old">4.10.4.</del> <ins class= "diff-chg">4.11.1.4.</ins> The <del class= "diff-old">globalStorage</del> <code title= "dom-localStorage"><ins class="diff-chg">localStorage</ins></code> attribute</a></li> <li><a href="#the-storage0"><del class= "diff-old">4.10.5.</del> <ins class= "diff-chg">4.11.1.5.</ins> The <code title= "event-storage">storage</code> event</a> <del class= "diff-old">4.10.6. Miscellaneous implementation requirements for storage areas</del> <ul class="toc"> <li><a href="#event0"><del class= "diff-old">4.10.6.1.</del> <ins class= "diff-chg">4.11.1.5.1.</ins> <del class="diff-old">Disk space</del> <ins class="diff-chg">Event definition</ins></a></li> </ul> </li> <li><a href="#threads0"><del class= "diff-old">4.10.6.2.</del> <ins class= "diff-chg">4.11.1.6.</ins> Threads</a></li> </ul> </li> <li><a href="#sql"><del class= "diff-old">4.10.7.</del> <ins class="diff-chg">4.11.2</ins> <del class="diff-old">Security and privacy</del> <ins class= "diff-chg">Database storage</ins></a> <ul class="toc"> <li><a href="#introduction3"><del class= "diff-old">4.10.7.1.</del> <ins class= "diff-chg">4.11.2.1.</ins> <del class="diff-old">User tracking</del> <ins class="diff-chg">Introduction</ins></a></li> <li><a href="#databases"><del class= "diff-old">4.10.7.2.</del> <ins class= "diff-chg">4.11.2.2.</ins> <del class="diff-old">Cookie resurrection</del> <ins class="diff-chg">Databases</ins></a></li> <li><a href="#executing"><del class= "diff-old">4.10.7.3.</del> <ins class= "diff-chg">4.11.2.3.</ins> <del class="diff-old">DNS spoofing attacks</del> <ins class="diff-chg">Executing SQL statements</ins></a></li> <li><a href="#database"><del class= "diff-old">4.10.7.4.</del> <ins class= "diff-chg">4.11.2.4.</ins> <del class= "diff-old">Cross-directory attacks</del> <ins class= "diff-chg">Database query results</ins></a></li> <li><a href="#errors"><del class= "diff-old">4.10.7.5.</del> <ins class= "diff-chg">4.11.2.5.</ins> <del class= "diff-old">Implementation risks</del> <ins class= "diff-chg">Errors</ins></a></li> <li><a href="#processing3"><del class= "diff-old">4.11.</del> <ins class="diff-chg">4.11.2.6.</ins> <del class="diff-old">Client-side database storage</del> <ins class="diff-chg">Processing model</ins></a></li> </ul> </li> <li><a href="#disk-space"><del class= "diff-old">4.11.1.</del> <ins class="diff-chg">4.11.3</ins> <del class="diff-old">Introduction</del> <ins class="diff-chg">Disk space</ins></a></li> <li><a href="#privacy"><del class= "diff-old">4.11.2.</del> <ins class="diff-chg">4.11.4</ins> <del class="diff-old">Databases</del> <ins class= "diff-chg">Privacy</ins></a> <ul class="toc"> <li><a href="#user-tracking"><del class= "diff-old">4.11.3.</del> <ins class= "diff-chg">4.11.4.1.</ins> <del class="diff-old">Executing SQL statements</del> <ins class="diff-chg">User tracking</ins></a></li> <li><a href="#cookie"><del class= "diff-old">4.11.4.</del> <ins class= "diff-chg">4.11.4.2.</ins> <del class="diff-old">Database query results</del> <ins class="diff-chg">Cookie resurrection</ins></a></li> </ul> </li> <li><a href="#security7"><del class= "diff-old">4.11.5.</del> <ins class="diff-chg">4.11.5</ins> <del class="diff-old">Errors</del> <ins class= "diff-chg">Security</ins></a> <ul class="toc"> <li><a href="#dns-spoofing"><del class= "diff-old">4.11.6.</del> <ins class= "diff-chg">4.11.5.1.</ins> <del class="diff-old">Processing model</del> <ins class="diff-chg">DNS spoofing attacks</ins></a></li> <li><a href="#cross-directory"><del class= "diff-old">4.11.7.</del> <ins class= "diff-chg">4.11.5.2.</ins> <del class= "diff-old">Privacy</del> <ins class="diff-chg">Cross-directory attacks</ins></a></li> <li><a href="#implementation"><del class= "diff-old">4.11.8.</del> <ins class= "diff-chg">4.11.5.3.</ins> <del class= "diff-old">Security</del> <ins class="diff-chg">Implementation risks</ins></a></li> <li><a href="#sql-and"><del class= "diff-old">4.11.8.1.</del> <ins class= "diff-chg">4.11.5.4.</ins> <del class="diff-old">User</del> <ins class="diff-chg">SQL and user</ins> agents</a></li> <li><a href="#sql-injection"><del class= "diff-old">4.11.8.2.</del> <ins class= "diff-chg">4.11.5.5.</ins> SQL injection</a></li> </ul> </li> </ul> </li> <li><a href="#links"><del class= "diff-old">4.12.</del> <ins class="diff-chg">4.12</ins> Links</a> <ul class="toc"> <li><a href="#hyperlink"><del class= "diff-old">4.12.1.</del> <ins class="diff-chg">4.12.1</ins> Hyperlink elements</a></li> <li><a href="#following"><del class= "diff-old">4.12.2.</del> <ins class="diff-chg">4.12.2</ins> Following hyperlinks</a> <ul class="toc"> <li><a href="#hyperlink0">4.12.2.1. Hyperlink auditing</a></li> </ul> </li> <li><a href="#linkTypes"><del class= "diff-old">4.12.3.</del> <ins class="diff-chg">4.12.3</ins> Link types</a> <ul class="toc"> <li><a href="#link-type">4.12.3.1. Link type " <code>alternate</code> "</a></li> <li><a href="#link-type0">4.12.3.2. Link type " <code>archives</code> "</a></li> <li><a href="#link-type1">4.12.3.3. Link type " <code>author</code> "</a></li> <li><a href="#link-type2">4.12.3.4. Link type " <code>bookmark</code> "</a></li> <li><a href="#link-type3">4.12.3.5. Link type " <code><del class="diff-old">contact</del> <ins class= "diff-chg">external</ins></code> "</a></li> <li><a href="#link-type4">4.12.3.6. Link type " <code><del class="diff-old">external</del> <ins class= "diff-chg">feed</ins></code> "</a></li> <li><a href="#link-type5">4.12.3.7. Link type " <code><del class="diff-old">feed " 4.12.3.8. Link type "</del> help</code> "</a></li> <li><a href="#rel-icon"><del class= "diff-old">4.12.3.9.</del> <ins class= "diff-chg">4.12.3.8.</ins> Link type " <code>icon</code> "</a></li> <li><a href="#link-type6"><del class= "diff-old">4.12.3.10.</del> <ins class= "diff-chg">4.12.3.9.</ins> Link type " <code>license</code> "</a></li> <li><a href="#link-type7"><del class= "diff-old">4.12.3.11.</del> <ins class= "diff-chg">4.12.3.10.</ins> Link type " <code>nofollow</code> "</a></li> <li><a href="#link-type8"><del class= "diff-old">4.12.3.12.</del> <ins class= "diff-chg">4.12.3.11.</ins> Link type " <code>noreferrer</code> "</a></li> <li><a href="#link-type9"><del class= "diff-old">4.12.3.13.</del> <ins class= "diff-chg">4.12.3.12.</ins> Link type " <code>pingback</code> "</a></li> <li><a href="#link-type10"><del class= "diff-old">4.12.3.14.</del> <ins class= "diff-chg">4.12.3.13.</ins> Link type " <code>prefetch</code> "</a></li> <li><a href="#link-type11"><del class= "diff-old">4.12.3.15.</del> <ins class= "diff-chg">4.12.3.14.</ins> Link type " <code>search</code> "</a></li> <li><a href="#link-type12"><del class= "diff-old">4.12.3.16.</del> <ins class= "diff-chg">4.12.3.15.</ins> Link type " <code>stylesheet</code> "</a></li> <li><a href="#link-type13"><del class= "diff-old">4.12.3.17.</del> <ins class= "diff-chg">4.12.3.16.</ins> Link type " <code>sidebar</code> "</a></li> <li><a href="#link-type14"><del class= "diff-old">4.12.3.18.</del> <ins class= "diff-chg">4.12.3.17.</ins> Link type " <code>tag</code> "</a></li> <li><a href="#hierarchical"><del class= "diff-old">4.12.3.19.</del> <ins class= "diff-chg">4.12.3.18.</ins> Hierarchical link types</a> <ul class="toc"> <li><a href="#link-type15"><del class= "diff-old">4.12.3.19.1.</del> <ins class= "diff-chg">4.12.3.18.1.</ins> Link type " <code>index</code> "</a></li> <li><a href="#link-type16"><del class= "diff-old">4.12.3.19.2.</del> <ins class= "diff-chg">4.12.3.18.2.</ins> Link type " <code>up</code> "</a></li> </ul> </li> <li><a href="#sequential0"><del class= "diff-old">4.12.3.20.</del> <ins class= "diff-chg">4.12.3.19.</ins> Sequential link types</a> <ul class="toc"> <li><a href="#link-type17"><del class= "diff-old">4.12.3.20.1.</del> <ins class= "diff-chg">4.12.3.19.1.</ins> Link type " <code>first</code> "</a></li> <li><a href="#link-type18"><del class= "diff-old">4.12.3.20.2.</del> <ins class= "diff-chg">4.12.3.19.2.</ins> Link type " <code>last</code> "</a></li> <li><a href="#link-type19"><del class= "diff-old">4.12.3.20.3.</del> <ins class= "diff-chg">4.12.3.19.3.</ins> Link type " <code>next</code> "</a></li> <li><a href="#link-type20"><del class= "diff-old">4.12.3.20.4.</del> <ins class= "diff-chg">4.12.3.19.4.</ins> Link type " <code>prev</code> "</a></li> </ul> </li> <li><a href="#other0"><del class= "diff-old">4.12.3.21.</del> <ins class= "diff-chg">4.12.3.20.</ins> Other link types</a></li> </ul> </li> </ul> </li> <li><a href="#interfaces"><del class= "diff-old">4.13.</del> <ins class="diff-chg">4.13</ins> Interfaces for URI manipulation</a></li> </ul> </li> <li><a href="#editing">5. Editing</a> <ul class="toc"> <li><a href="#editing-intro"><del class= "diff-old">5.1.</del> <ins class="diff-chg">5.1</ins> Introduction</a></li> <li><a href="#contenteditable"><del class= "diff-old">5.2.</del> <ins class="diff-chg">5.2</ins> The <code title="attr-contenteditable">contenteditable</code> attribute</a> <ul class="toc"> <li><a href="#user-editing"><del class= "diff-old">5.2.1.</del> <ins class="diff-chg">5.2.1</ins> User editing actions</a></li> <li><a href="#making"><del class= "diff-old">5.2.2.</del> <ins class="diff-chg">5.2.2</ins> Making entire documents editable</a></li> </ul> </li> <li><a href="#dnd"><del class= "diff-old">5.3.</del> <ins class="diff-chg">5.3</ins> Drag and drop</a> <ul class="toc"> <li><a href="#introduction4"><ins class= "diff-new">5.3.1</ins> <ins class= "diff-new">Introduction</ins></a></li> <li><a href="#the-dragevent"><del class= "diff-old">5.3.1.</del> <ins class="diff-chg">5.3.2</ins> The <code>DragEvent</code> and <code>DataTransfer</code> interfaces</a></li> <li><a href="#events1"><del class= "diff-old">5.3.2.</del> <ins class="diff-chg">5.3.3</ins> Events fired during a drag-and-drop action</a></li> <li><a href="#drag-and-drop"><del class= "diff-old">5.3.3.</del> <ins class="diff-chg">5.3.4</ins> Drag-and-drop processing model</a> <ul class="toc"> <li><a href="#when-the"><del class= "diff-old">5.3.3.1.</del> <ins class= "diff-chg">5.3.4.1.</ins> When the drag-and-drop operation starts or ends in another document</a></li> <li><a href="#when-the0"><del class= "diff-old">5.3.3.2.</del> <ins class= "diff-chg">5.3.4.2.</ins> When the drag-and-drop operation starts or ends in another application</a></li> </ul> </li> <li><a href="#the-draggable"><del class= "diff-old">5.3.4.</del> <ins class="diff-chg">5.3.5</ins> The <code>draggable</code> attribute</a></li> <li><a href="#copy-and"><del class= "diff-old">5.3.5.</del> <ins class="diff-chg">5.3.6</ins> Copy and paste</a> <ul class="toc"> <li><a href="#copy-to"><del class= "diff-old">5.3.5.1.</del> <ins class= "diff-chg">5.3.6.1.</ins> Copy to clipboard</a></li> <li><a href="#cut-to"><del class= "diff-old">5.3.5.2.</del> <ins class= "diff-chg">5.3.6.2.</ins> Cut to clipboard</a></li> <li><a href="#paste"><del class= "diff-old">5.3.5.3.</del> <ins class= "diff-chg">5.3.6.3.</ins> Paste from clipboard</a></li> <li><a href="#paste0"><del class= "diff-old">5.3.5.4.</del> <ins class= "diff-chg">5.3.6.4.</ins> Paste from selection</a></li> </ul> </li> <li><a href="#security8"><del class= "diff-old">5.3.6.</del> <ins class="diff-chg">5.3.7</ins> Security risks in the drag-and-drop model</a></li> </ul> </li> <li><a href="#undo"><del class= "diff-old">5.4.</del> <ins class="diff-chg">5.4</ins> Undo history</a> <ul class="toc"> <li><a href="#the-undomanager"><del class= "diff-old">5.4.1.</del> <ins class="diff-chg">5.4.1</ins> The <code>UndoManager</code> interface</a></li> <li><a href="#undo-moving"><del class= "diff-old">5.4.2.</del> <ins class="diff-chg">5.4.2</ins> Undo: moving back in the undo transaction history</a></li> <li><a href="#redo-moving"><del class= "diff-old">5.4.3.</del> <ins class="diff-chg">5.4.3</ins> Redo: moving forward in the undo transaction history</a></li> <li><a href="#the-undomanagerevent"><del class= "diff-old">5.4.4.</del> <ins class="diff-chg">5.4.4</ins> The <code>UndoManagerEvent</code> interface and the <code title= "event-undo">undo</code> and <code title="event-redo">redo</code> events</a></li> <li><a href="#implementation0"><del class= "diff-old">5.4.5.</del> <ins class="diff-chg">5.4.5</ins> Implementation notes</a></li> </ul> </li> <li><del class="diff-old">5.5. Command APIs</del> <a href= "#selection"><del class="diff-old">5.6.</del> <ins class="diff-chg">5.5</ins> The text selection APIs</a> <ul class="toc"> <li><a href="#documentSelection"><del class= "diff-old">5.6.1.</del> <ins class="diff-chg">5.5.1</ins> APIs for the browsing context selection</a></li> <li><a href="#textFieldSelection"><del class= "diff-old">5.6.2.</del> <ins class="diff-chg">5.5.2</ins> APIs for the text field selections</a></li> </ul> </li> <li><a href="#command"><ins class= "diff-new">5.6</ins> <ins class="diff-new">Command APIs</ins></a></li> </ul> </li> <li><a href="#comms">6. Communication</a> <ul class="toc"> <li><a href="#event1"><del class= "diff-old">6.1.</del> <ins class="diff-chg">6.1</ins> Event definitions</a></li> <li><a href="#server-sent-events"><del class= "diff-old">6.2.</del> <ins class="diff-chg">6.2</ins> Server-sent DOM events</a> <ul class="toc"> <li><a href="#the-remoteeventtarget"><del class="diff-old">6.2.1.</del> <ins class= "diff-chg">6.2.1</ins> The <code>RemoteEventTarget</code> interface</a></li> <li><a href="#connecting"><del class= "diff-old">6.2.2.</del> <ins class="diff-chg">6.2.2</ins> Connecting to an event stream</a></li> <li><a href="#parsing1"><del class= "diff-old">6.2.3.</del> <ins class="diff-chg">6.2.3</ins> Parsing an event stream</a></li> <li><a href="#event-stream-interpretation"><del class="diff-old">6.2.4.</del> <ins class= "diff-chg">6.2.4</ins> Interpreting an event stream</a></li> <li><a href="#notes"><del class= "diff-old">6.2.5.</del> <ins class="diff-chg">6.2.5</ins> Notes</a></li> </ul> </li> <li><a href="#network"><del class= "diff-old">6.3.</del> <ins class="diff-chg">6.3</ins> Network connections</a> <ul class="toc"> <li><a href="#network-intro"><del class= "diff-old">6.3.1.</del> <ins class="diff-chg">6.3.1</ins> Introduction</a></li> <li><a href="#the-connection"><del class= "diff-old">6.3.2.</del> <ins class="diff-chg">6.3.2</ins> The <code>Connection</code> interface</a></li> <li><a href="#connection"><del class= "diff-old">6.3.3.</del> <ins class="diff-chg">6.3.3</ins> Connection Events</a></li> <li><a href="#tcp-connections"><del class= "diff-old">6.3.4.</del> <ins class="diff-chg">6.3.4</ins> TCP connections</a></li> <li><a href="#broadcast"><del class= "diff-old">6.3.5.</del> <ins class="diff-chg">6.3.5</ins> Broadcast connections</a> <ul class="toc"> <li><a href="#broadcasting">6.3.5.1. Broadcasting over TCP/IP</a></li> <li><a href="#bluetooth-broadcast">6.3.5.2. Broadcasting over Bluetooth</a></li> <li><a href="#irda-broadcast">6.3.5.3. Broadcasting over IrDA</a></li> </ul> </li> <li><a href="#peer-to-peer"><del class= "diff-old">6.3.6.</del> <ins class="diff-chg">6.3.6</ins> Peer-to-peer connections</a> <ul class="toc"> <li><a href="#peer-to-peer0">6.3.6.1. Peer-to-peer connections over TCP/IP</a></li> <li><a href="#bluetooth-peer">6.3.6.2. Peer-to-peer connections over Bluetooth</a></li> <li><a href="#irda-peer">6.3.6.3. Peer-to-peer connections over IrDA</a></li> </ul> </li> <li><a href="#the-common"><del class= "diff-old">6.3.7.</del> <ins class="diff-chg">6.3.7</ins> The common protocol for TCP-based connections</a> <ul class="toc"> <li><a href="#clients">6.3.7.1. Clients connecting over TCP</a></li> <li><a href="#servers">6.3.7.2. Servers accepting connections over TCP</a></li> <li><a href="#sending">6.3.7.3. Sending and receiving data over TCP</a></li> </ul> </li> <li><a href="#network-security"><del class= "diff-old">6.3.8.</del> <ins class="diff-chg">6.3.8</ins> Security</a></li> <li><a href="#network-other-specs"><del class= "diff-old">6.3.9.</del> <ins class="diff-chg">6.3.9</ins> Relationship to other standards</a></li> </ul> </li> <li><a href="#crossDocumentMessages"><del class="diff-old">6.4.</del> <ins class= "diff-chg">6.4</ins> Cross-document messaging</a> <ul class="toc"> <li><a href="#processing4"><del class= "diff-old">6.4.1.</del> <ins class="diff-chg">6.4.1</ins> Processing model</a></li> </ul> </li> </ul> </li> <li><a href="#repetition">7. Repetition templates</a></li> <li><a href="#syntax">8. The HTML syntax</a> <ul class="toc"> <li><a href="#writing0"><del class= "diff-old">8.1.</del> <ins class="diff-chg">8.1</ins> Writing HTML documents</a> <ul class="toc"> <li><a href="#the-doctype"><del class= "diff-old">8.1.1.</del> <ins class="diff-chg">8.1.1</ins> The DOCTYPE</a></li> <li><a href="#elements0"><del class= "diff-old">8.1.2.</del> <ins class="diff-chg">8.1.2</ins> Elements</a> <ul class="toc"> <li><a href="#start">8.1.2.1. Start tags</a></li> <li><a href="#end-tags">8.1.2.2. End tags</a></li> <li><a href="#attributes1">8.1.2.3. Attributes</a></li> <li><a href="#optional">8.1.2.4. Optional tags</a></li> <li><a href="#element-restrictions">8.1.2.5. Restrictions on content models</a></li> <li><a href="#cdata-rcdata-restrictions">8.1.2.6. Restrictions on the contents of CDATA and RCDATA elements</a></li> </ul> </li> <li><a href="#text0"><del class= "diff-old">8.1.3.</del> <ins class="diff-chg">8.1.3</ins> Text</a> <ul class="toc"> <li><a href="#newlines">8.1.3.1. Newlines</a></li> </ul> </li> <li><a href="#character"><del class= "diff-old">8.1.4.</del> <ins class="diff-chg">8.1.4</ins> Character <del class="diff-old">entity</del> references</a></li> <li><a href="#cdata"><ins class= "diff-new">8.1.5</ins> <ins class="diff-new">CDATA blocks</ins></a></li> <li><a href="#comments"><del class= "diff-old">8.1.5.</del> <ins class="diff-chg">8.1.6</ins> Comments</a></li> </ul> </li> <li><a href="#parsing"><del class= "diff-old">8.2.</del> <ins class="diff-chg">8.2</ins> Parsing HTML documents</a> <ul class="toc"> <li><a href="#overview"><del class= "diff-old">8.2.1.</del> <ins class="diff-chg">8.2.1</ins> Overview of the parsing model</a></li> <li><a href="#the-input0"><del class= "diff-old">8.2.2.</del> <ins class="diff-chg">8.2.2</ins> The input stream</a> <ul class="toc"> <li><a href="#determining">8.2.2.1. Determining the character encoding</a></li> <li><a href="#character0">8.2.2.2. Character encoding requirements</a></li> <li><a href="#preprocessing">8.2.2.3. Preprocessing the input stream</a></li> <li><a href="#changing">8.2.2.4. Changing the encoding while parsing</a></li> </ul> </li> <li><a href="#parse"><del class= "diff-old">8.2.3.</del> <ins class="diff-chg">8.2.3</ins> <del class="diff-old">Tokenisation</del> <ins class= "diff-chg">Parse state</ins></a> <ul class="toc"> <li><a href="#the-insertion">8.2.3.1. <del class="diff-old">Tokenising entities</del> <ins class= "diff-chg">The insertion mode</ins></a></li> <li><a href="#the-stack"><del class= "diff-old">8.2.4.</del> <ins class="diff-chg">8.2.3.2.</ins> <del class="diff-old">Tree construction</del> <ins class= "diff-chg">The stack of open elements</ins></a></li> <li><a href="#the-list"><del class= "diff-old">8.2.4.1.</del> <ins class= "diff-chg">8.2.3.3.</ins> The <del class="diff-old">initial phase</del> <ins class="diff-chg">list of active formatting elements</ins></a></li> <li><a href="#the-element"><del class= "diff-old">8.2.4.2.</del> <ins class= "diff-chg">8.2.3.4.</ins> The <del class= "diff-old">root</del> element <del class="diff-old">phase</del> <ins class="diff-chg">pointers</ins></a></li> <li><a href="#the-scripting"><del class= "diff-old">8.2.4.3.</del> <ins class= "diff-chg">8.2.3.5.</ins> The <del class="diff-old">main phase</del> <ins class="diff-chg">scripting state</ins></a></li> </ul> </li> <li><a href="#tokenisation"><ins class= "diff-chg">8.2.4</ins> <ins class= "diff-chg">Tokenisation</ins></a> <ul class="toc"> <li><a href="#tokenising"><del class= "diff-old">8.2.4.3.1.</del> <ins class= "diff-chg">8.2.4.1.</ins> <del class="diff-old">The stack of open elements</del> <ins class="diff-chg">Tokenising character references</ins></a></li> </ul> </li> <li><a href="#tree-construction"><del class= "diff-old">8.2.4.3.2.</del> <ins class= "diff-chg">8.2.5</ins> <del class="diff-old">The list of active formatting elements</del> <ins class="diff-chg">Tree construction</ins></a> <ul class="toc"> <li><a href="#creating"><del class= "diff-old">8.2.4.3.3.</del> <ins class= "diff-chg">8.2.5.1.</ins> Creating and inserting <del class= "diff-old">HTML</del> elements</a></li> <li><a href="#closing"><del class= "diff-old">8.2.4.3.4.</del> <ins class= "diff-chg">8.2.5.2.</ins> Closing elements that have implied end tags</a></li> <li><a href="#foster"><del class= "diff-old">8.2.4.3.5.</del> <ins class= "diff-chg">8.2.5.3.</ins> <ins class="diff-chg">Foster parenting</ins></a></li> <li><a href="#the-initial"><ins class= "diff-chg">8.2.5.4.</ins> The <del class="diff-old">element pointers</del> <ins class="diff-chg">"initial" insertion mode</ins></a></li> <li><a href="#the-before"><del class= "diff-old">8.2.4.3.6.</del> <ins class= "diff-chg">8.2.5.5.</ins> The <ins class="diff-new">"before html"</ins> insertion mode</a></li> <li><a href="#the-before0"><del class= "diff-old">8.2.4.3.7.</del> <ins class= "diff-chg">8.2.5.6.</ins> <del class="diff-old">How to handle tokens in the main phase</del> <ins class="diff-chg">The "before head" insertion mode</ins></a></li> <li><a href="#parsing-main-inhead"><del class= "diff-old">8.2.4.4.</del> <ins class= "diff-chg">8.2.5.7.</ins> The <del class="diff-old">trailing end phase</del> <ins class="diff-chg">"in head" insertion mode</ins></a></li> <li><a href="#parsing-main-inheadnoscript"><del class="diff-old">8.2.5.</del> <ins class= "diff-chg">8.2.5.8.</ins> The <del class= "diff-old">End</del> <ins class="diff-chg">"in head noscript" insertion mode</ins></a></li> <li><a href="#the-after"><del class= "diff-old">8.3.</del> <ins class="diff-chg">8.2.5.9.</ins> <del class="diff-old">Namespaces</del> <ins class="diff-chg">The "after head" insertion mode</ins></a></li> <li><a href="#parsing-main-inbody"><del class= "diff-old">8.4.</del> <ins class="diff-chg">8.2.5.10.</ins> <del class="diff-old">Serialising HTML fragments</del> <ins class= "diff-chg">The "in body" insertion mode</ins></a></li> <li><a href="#parsing-main-intable"><del class= "diff-old">8.5.</del> <ins class="diff-chg">8.2.5.11.</ins> <del class="diff-old">Parsing HTML fragments</del> <ins class= "diff-chg">The "in table" insertion mode</ins></a></li> <li><a href="#parsing-main-incaption"><del class="diff-old">8.6.</del> <ins class= "diff-chg">8.2.5.12.</ins> <del class= "diff-old">Entities</del> <ins class="diff-chg">The "in caption" insertion mode</ins></a></li> <li><a href="#parsing-main-incolgroup"><del class="diff-old">9.</del> <ins class= "diff-chg">8.2.5.13.</ins> <del class="diff-old">WYSIWYG editors</del> <ins class="diff-chg">The "in column group" insertion mode</ins></a></li> <li><a href="#parsing-main-intbody"><del class= "diff-old">9.1.</del> <ins class="diff-chg">8.2.5.14.</ins> <del class="diff-old">Presentational markup</del> <ins class= "diff-chg">The "in table body" insertion mode</ins></a></li> <li><a href="#parsing-main-intr"><del class= "diff-old">9.1.1.</del> <ins class= "diff-chg">8.2.5.15.</ins> <del class="diff-old">WYSIWYG signature</del> <ins class="diff-chg">The "in row" insertion mode</ins></a></li> <li><a href="#parsing-main-intd"><del class= "diff-old">9.1.2.</del> <ins class= "diff-chg">8.2.5.16.</ins> The <del class="diff-old">font element</del> <ins class="diff-chg">"in cell" insertion mode</ins></a></li> <li><a href="#parsing-main-inselect"><ins class="diff-chg">8.2.5.17.</ins> <ins class= "diff-chg">The "in select" insertion mode</ins></a></li> <li><a href="#parsing-main-inselectintable"><ins class="diff-chg">8.2.5.18.</ins> <ins class= "diff-chg">The "in select in table" insertion mode</ins></a></li> <li><a href="#parsing-main-inforeign"><ins class="diff-chg">8.2.5.19.</ins> <ins class= "diff-chg">The "in foreign content" insertion mode</ins></a></li> <li><a href="#parsing-main-afterbody"><ins class="diff-chg">8.2.5.20.</ins> <ins class= "diff-chg">The "after body" insertion mode</ins></a></li> <li><a href="#parsing-main-inframeset"><ins class="diff-chg">8.2.5.21.</ins> <ins class= "diff-chg">The "in frameset" insertion mode</ins></a></li> <li><a href="#parsing-main-afterframeset"><ins class="diff-chg">8.2.5.22.</ins> <ins class= "diff-chg">The "after frameset" insertion mode</ins></a></li> <li><a href="#the-after0"><ins class= "diff-chg">8.2.5.23.</ins> <ins class="diff-chg">The "after after body" insertion mode</ins></a></li> <li><a href="#the-after1"><ins class= "diff-chg">8.2.5.24.</ins> <ins class="diff-chg">The "after after frameset" insertion mode</ins></a></li> </ul> </li> <li><a href="#the-end"><ins class= "diff-chg">8.2.6</ins> <ins class="diff-chg">The end</ins></a></li> </ul> </li> <li><a href="#namespaces"><ins class= "diff-new">8.3</ins> <ins class= "diff-new">Namespaces</ins></a></li> <li><a href="#serializing"><ins class= "diff-new">8.4</ins> <ins class="diff-new">Serializing HTML fragments</ins></a></li> <li><a href="#parsing2"><ins class= "diff-new">8.5</ins> <ins class="diff-new">Parsing HTML fragments</ins></a></li> <li><a href="#named"><ins class= "diff-new">8.6</ins> <ins class="diff-new">Named character references</ins></a></li> </ul> </li> <li><a href="#rendering"><del class= "diff-old">10.</del> <ins class="diff-chg">9.</ins> Rendering <ins class="diff-new">and user-agent behavior</ins></a> <ul class="toc"> <li><a href="#rendering0"><del class= "diff-old">10.1.</del> <ins class="diff-chg">9.1</ins> Rendering and the DOM</a></li> <li><a href="#rendering1"><del class= "diff-old">10.2.</del> <ins class="diff-chg">9.2</ins> Rendering and menus/toolbars</a> <ul class="toc"> <li><a href="#the-icon"><del class= "diff-old">10.2.1.</del> <ins class="diff-chg">9.2.1</ins> The 'icon' property</a></li> </ul> </li> <li><a href="#obsolete"><ins class= "diff-new">9.3</ins> <ins class="diff-new">Obsolete elements, attributes, and APIs</ins></a> <ul class="toc"> <li><a href="#the-body0"><ins class= "diff-new">9.3.1</ins> <ins class="diff-new">The</ins> <code><ins class="diff-new">body</ins></code> <ins class= "diff-new">element</ins></a></li> <li><a href="#the-applet"><ins class= "diff-new">9.3.2</ins> <ins class="diff-new">The</ins> <code><ins class="diff-new">applet</ins></code> <ins class= "diff-new">element</ins></a></li> </ul> </li> </ul> </li> <li><a href="#no"><del class= "diff-old">11.</del> <ins class="diff-chg">10.</ins> Things that you can't do with this specification because they are better handled using other technologies that are further described herein</a> <ul class="toc"> <li><a href="#localization"><del class= "diff-old">11.1.</del> <ins class="diff-chg">10.1</ins> <del class="diff-old">Localisation</del> <ins class= "diff-chg">Localization</ins></a></li> <li><a href="#declarative"><del class= "diff-old">11.2.</del> <ins class="diff-chg">10.2</ins> Declarative 2D vector graphics and animation</a></li> <li><a href="#declarative0"><del class= "diff-old">11.3.</del> <ins class="diff-chg">10.3</ins> Declarative 3D scenes</a></li> <li><a href="#timers"><del class= "diff-old">11.4.</del> <ins class="diff-chg">10.4</ins> Timers</a></li> </ul> </li> <li class="no-num"><del class="diff-old">11.5. Events</del> <a href="#index"><ins class="diff-chg">Index</ins></a></li> <li class="no-num"><a href="#references">References</a></li> <li class="no-num"><a href= "#acknowledgements">Acknowledgements</a></li> </ul> <hr> <h2 id="introduction">1. Introduction</h2> This section is non-normative. The World Wide Web's markup language has always been HTML. HTML was primarily designed as a language for semantically describing scientific documents, although its general design and adaptations over the years has enabled it to be used to describe a number of other types of documents. The main area that has not been adequately addressed by HTML is a vague subject referred to as Web Applications. This specification attempts to rectify this, while at the same time updating the HTML specifications to address issues raised in the past few years. <h3 id="scope"><del class="diff-old">1.1.</del> <ins class="diff-chg">1.1</ins> Scope</h3> This section is non-normative. This specification is limited to providing a semantic-level markup language and associated semantic-level scripting APIs for authoring accessible pages on the Web ranging from static documents to dynamic applications. The scope of this specification does not include <del class= "diff-old">addressing</del> <ins class="diff-chg">providing mechanisms for media-specific customization of</ins> presentation <del class="diff-old">concerns</del> (although default rendering rules for Web browsers are included at the end of this <del class= "diff-old">specification).</del> <ins class= "diff-chg">specification, and several mechanisms for hooking into CSS are provided as part of the language).</ins> The scope of this specification does not include documenting every HTML or DOM feature supported by Web browsers. Browsers support many features that are considered to be very bad for accessibility or that are otherwise inappropriate. For example, the <code>blink</code> element is clearly presentational and authors wishing to cause text to blink should instead use CSS. The scope of this specification is not to describe an entire operating system. In particular, hardware configuration software, image manipulation tools, and applications that users would be expected to use with high-end workstations on a daily basis are out of scope. In terms of applications, this specification is targeted specifically at applications that would be expected to be used by users on an occasional basis, or regularly but from disparate locations, with low CPU requirements. For instance online purchasing systems, searching systems, games (especially multiplayer online games), public telephone books or address books, communications software (e-mail clients, instant messaging clients, discussion software), document editing software, etc. For sophisticated cross-platform applications, there already exist several proprietary solutions (such as Mozilla's XUL, Adobe's Flash, or Microsoft's Silverlight). These solutions are evolving faster than any standards process could follow, and the requirements are evolving even faster. These systems are also significantly more complicated to specify, and are orders of magnitude more difficult to achieve interoperability with, than the solutions described in this document. Platform-specific solutions for such sophisticated applications (for example the MacOS X Core APIs) are even further ahead. <h4 id="relationship"><del class= "diff-old">1.1.1.</del> <ins class="diff-chg">1.1.1</ins> Relationship to HTML 4.01, XHTML 1.1, DOM2 HTML</h4> This section is non-normative. This specification represents a new version of <del class= "diff-old">HTML4 and XHTML1,</del> <ins class="diff-chg">the HTML language,</ins> along with a new version of the associated DOM2 HTML API. Migration from HTML4 or XHTML1 to the format and APIs described in this specification should in most cases be straightforward, as care has been taken to ensure that backwards-compatibility is retained. This specification will eventually supplant Web Forms 2.0 as well. <a href="#references">[WF2]</a> <h4 id="relationship0"><del class= "diff-old">1.1.2.</del> <ins class="diff-chg">1.1.2</ins> Relationship to XHTML2</h4> This section is non-normative. XHTML2 <a href="#references">[XHTML2]</a> defines a new HTML vocabulary with better features for hyperlinks, multimedia content, annotating document edits, rich metadata, declarative interactive forms, and describing the semantics of human literary works such as poems and scientific papers. However, it lacks elements to express the semantics of many of the non-document types of content often seen on the Web. For instance, forum sites, auction sites, search engines, online shops, and the like, do not fit the document metaphor well, and are not covered by XHTML2. This specification aims to extend HTML so that it is also suitable in these contexts. XHTML2 and this specification use different namespaces and therefore can both be implemented in the same XML processor. <h4 id="relationship1"><del class= "diff-old">1.1.3.</del> <ins class="diff-chg">1.1.3</ins> Relationship to XUL, Flash, Silverlight, and other proprietary UI languages</h4> This section is non-normative. This specification is independent of the various proprietary UI languages that various vendors provide. As an open, <del class= "diff-old">vender-neutral</del> <ins class= "diff-chg">vendor-neutral</ins> language, HTML provides for a solution to the same problems without the risk of vendor lock-in. <h3 id="structure"><del class= "diff-old">1.2.</del> <ins class="diff-chg">1.2</ins> Structure of this specification</h3> This section is non-normative. This specification is divided into the following important sections: <dl> <dt><a href="#dom">The DOM</a></dt> <dd>The DOM, or Document Object Model, provides a base for the rest of the specification.</dd> <dt><a href="#semantics">The Semantics</a></dt> <dd>Documents are built from elements. These elements form a tree using the DOM. Each element also has a predefined meaning, which is explained in this section. User agent requirements for how to handle each element are also given, along with rules for authors on how to use the element.</dd> <dt><a href="#windows">Browsing Contexts</a></dt> <dd>HTML documents do not exist in a vacuum — this section defines many of the features that affect environments that deal with multiple pages, links between pages, and running scripts.</dd> <dt>APIs</dt> <dd><a href="#editing">The Editing APIs</a> : HTML documents can provide a number of mechanisms for users to modify content, which are described in this section.</dd> <dd><a href="#comms">The Communication APIs</a> : Applications written in HTML often require mechanisms to communicate with remote servers, as well as communicating with other applications from different domains running on the same client.</dd> <dd><a href="#repetition">Repetition Templates</a> : A mechanism to support repeating sections in forms.</dd> <dt><a href="#syntax">The Language Syntax</a></dt> <dd>All of these features would be for naught if they couldn't be represented in a <del class="diff-old">serialised</del> <ins class= "diff-chg">serialized</ins> form and sent to other people, and so this section defines the syntax of HTML, along with rules for how to parse HTML.</dd> </dl> There are also a couple of appendices, defining <del class= "diff-old">shims for WYSIWYG editors ,</del> <a href= "#rendering">rendering rules</a> for Web <del class= "diff-old">browsers,</del> <ins class="diff-chg">browsers</ins> and listing <a href="#no">areas that are out of scope</a> for this specification. <h4 id="how-to"><del class= "diff-old">1.2.1.</del> <ins class="diff-chg">1.2.1</ins> How to read this specification</h4> This specification should be read like all other specifications. First, it should be read cover-to-cover, multiple times. Then, it should be read backwards at least once. Then it should be read by picking random sections from the contents list and following all the cross-references. <h3 id="conformance"><del class= "diff-old">1.3.</del> <ins class="diff-chg">1.3</ins> Conformance requirements</h3> All diagrams, examples, and notes in this specification are non-normative, as are all sections explicitly marked non-normative. Everything else in this specification is normative. The key words "MUST", "MUST NOT", "REQUIRED", <del class= "diff-old">"SHALL", "SHALL NOT",</del> "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in the normative parts of this document are to be interpreted as described in RFC2119. For readability, these words do not appear in all uppercase letters in this specification. <a href="#references">[RFC2119]</a> Requirements phrased in the imperative as part of algorithms (such as "strip any leading space characters" or "return false and abort these steps") are to be interpreted with the meaning of the key word ("must", "should", "may", etc) used in introducing the algorithm. This specification describes the conformance criteria for user agents (relevant to implementors) and documents (relevant to authors and authoring tool implementors). There is no implied relationship between document conformance requirements and implementation conformance requirements. User agents are not free to handle non-conformant documents as they please; the processing model described in this specification applies to implementations regardless of the conformity of the input documents. User agents fall into several (overlapping) categories with different conformance requirements. <dl> <dt id="interactive">Web browsers and other interactive user agents</dt> <dd> Web browsers that support <a href="#xhtml5">XHTML</a> must process elements and attributes from the <a href= "#html-namespace0">HTML namespace</a> found in <a href= "#xml-documents">XML documents</a> as described in this specification, so that users can interact with them, unless the semantics of those elements have been overridden by other specifications. A conforming XHTML processor would, upon finding an XHTML <code><a href="#script1">script</a></code> element in an XML document, execute the script contained in that element. However, if the element is found within an XSLT transformation sheet (assuming the UA also supports XSLT), then the processor would instead treat the <code><a href="#script1">script</a></code> element as an opaque element that forms part of the transform. Web browsers that support <a href="#html5" title= "HTML5">HTML</a> must process documents <del class= "diff-old">labelled</del> <ins class="diff-chg">labeled</ins> as <code>text/html</code> as described in this specification, so that users can interact with them. </dd> <dt id="non-interactive">Non-interactive presentation user agents</dt> <dd> User agents that process HTML and XHTML documents purely to render non-interactive versions of them must comply to the same conformance criteria as Web browsers, except that they are exempt from requirements regarding user interaction. Typical examples of non-interactive presentation user agents are printers (static UAs) and overhead displays (dynamic UAs). It is expected that most static non-interactive presentation user agents will also opt to <a href= "#non-scripted">lack scripting support</a> . A non-interactive but dynamic presentation UA would still execute scripts, allowing forms to be dynamically submitted, and so forth. However, since the concept of "focus" is irrelevant when the user cannot interact with the document, the UA would not need to support any of the focus-related DOM APIs. </dd> <dt><dfn id="non-scripted">User agents with no scripting support</dfn></dt> <dd> Implementations that do not support scripting (or which have their scripting features disabled <del class="diff-old">)</del> <ins class="diff-chg">entirely)</ins> are exempt from supporting the events and DOM interfaces mentioned in this specification. For the parts of this specification that are defined in terms of an events model or in terms of the DOM, such user agents must still act as if events and the DOM were supported. Scripting can form an integral part of an application. Web browsers that do not support scripting, or that have scripting disabled, might be unable to fully convey the author's intent. </dd> <dt>Conformance checkers</dt> <dd id="conformance-checkers"> Conformance checkers must verify that a document conforms to the applicable conformance criteria described in this specification. <del class="diff-old">Conformance</del> <ins class= "diff-chg">Automated conformance</ins> checkers are exempt from detecting errors that require interpretation of the author's intent (for example, while a document is non-conforming if the content of a <code><a href="#blockquote">blockquote</a></code> element is not a quote, conformance checkers <ins class="diff-new">running without the input of human judgement</ins> do not have to check that <code><a href="#blockquote">blockquote</a></code> elements only contain quoted material). Conformance checkers must check that the input document conforms when <ins class="diff-chg">parsed without a</ins> <a href= "#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">(meaning that no scripts are run, and that the parser's</ins> <a href="#scripting2">scripting <ins class= "diff-new">flag</ins></a> is <del class="diff-old">disabled ,</del> <ins class="diff-chg">disabled),</ins> and should also check that the input document conforms when <del class="diff-old">scripting is enabled .</del> <ins class="diff-chg">parsed with a</ins> <a href= "#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">in which scripts execute, and that the scripts never cause non-conforming states to occur other than transiently during script execution itself.</ins> (This is only a "SHOULD" and not a "MUST" requirement because it has been proven to be impossible. <a href="#references">[HALTINGPROBLEM]</a> ) The term "HTML5 validator" can be used to refer to a conformance checker that itself conforms to the applicable requirements of this specification. <div class="note"> XML DTDs cannot express all the conformance requirements of this specification. Therefore, a validating XML processor and a DTD cannot constitute a conformance checker. Also, since neither of the two authoring formats defined in this specification are applications of SGML, a validating SGML system cannot constitute a conformance checker either. To put it another way, there are three types of conformance criteria: <ol> <li>Criteria that can be expressed in a DTD.</li> <li>Criteria that cannot be expressed by a DTD, but can still be checked by a machine.</li> <li>Criteria that can only be checked by a human.</li> </ol> A conformance checker must check for the first two. A simple DTD-based validator only checks for the first class of errors and is therefore not a conforming conformance checker according to this specification. </div> </dd> <dt>Data mining tools</dt> <dd id="data-mining"> Applications and tools that process HTML and XHTML documents for reasons other than to either render the documents or check them for conformance should act in accordance to the semantics of the documents that they process. A tool that generates <a href="#outline" title= "outline">document outlines</a> but increases the nesting level for each paragraph and does not increase the nesting level for each section would not be conforming. </dd> <dt id="editors">Authoring tools and markup generators</dt> <dd> Authoring tools and markup generators must generate conforming documents. Conformance criteria that apply to authors also apply to authoring tools, where appropriate. Authoring tools are exempt from the strict requirements of using elements only for their specified purpose, but only to the extent that authoring tools are not yet able to determine author intent. For example, it is not conforming to use an <code><a href="#address">address</a></code> element for arbitrary contact information; that element can only be used for marking up contact information for the author of the document or section. However, since an authoring <del class="diff-old">tools</del> <ins class="diff-chg">tool</ins> is likely unable to determine the difference, an authoring tool is exempt from that requirement. In terms of conformance checking, an editor is therefore required to output documents that conform to the same extent that a conformance checker will verify. When an authoring tool is used to edit a non-conforming document, it may preserve the conformance errors in sections of the document that were not edited during the editing session (i.e. an editing tool is allowed to round-trip <del class= "diff-old">errorneous</del> <ins class="diff-chg">erroneous</ins> content). However, an authoring tool must not claim that the output is conformant if errors have been so preserved. Authoring tools are expected to come in two broad varieties: tools that work from structure or semantic data, and tools that work on a What-You-See-Is-What-You-Get media-specific editing basis (WYSIWYG). The former is the preferred mechanism for tools that author HTML, since the structure in the source information can be used to make informed choices regarding which HTML elements and attributes are most appropriate. However, WYSIWYG tools are <del class= "diff-old">legitimate,</del> <ins class="diff-chg">legitimate. WYSIWYG tools should use elements they know are appropriate,</ins> and <del class="diff-old">this specification makes</del> <ins class="diff-chg">should not use elements that they do not know to be appropriate. This might in</ins> certain <del class= "diff-old">concessions</del> <ins class="diff-chg">extreme cases mean limiting the use of flow elements</ins> to <del class= "diff-old">WYSIWYG editors .</del> <ins class="diff-chg">just a few elements, like</ins> <code><a href="#div"><ins class= "diff-chg">div</ins></a></code> ,<code><a href="#b"><ins class= "diff-chg">b</ins></a></code> ,<code><a href="#i"><ins class= "diff-chg">i</ins></a></code> ,<ins class="diff-chg">and</ins> <code><a href="#span"><ins class="diff-chg">span</ins></a></code> <ins class="diff-chg">and making liberal use of the</ins> <code title="attr-style"><a href="#style"><ins class= "diff-chg">style</ins></a></code> <ins class= "diff-chg">attribute.</ins> All authoring tools, whether WYSIWYG or not, should make a best effort attempt at enabling users to create well-structured, semantically rich, media-independent content. </dd> </dl> Some conformance requirements are phrased as requirements on elements, attributes, methods or objects. Such requirements fall into two <del class="diff-old">categories;</del> <ins class= "diff-chg">categories:</ins> those describing content model restrictions, and those describing implementation <del class= "diff-old">behaviour.</del> <ins class="diff-chg">behavior.</ins> The former category of requirements are requirements on documents and authoring tools. The second category are requirements on user agents. Conformance requirements phrased as algorithms or specific steps may be implemented in any manner, so long as the end result is equivalent. (In particular, the algorithms defined in this specification are intended to be easy to follow, and not intended to be performant.) User agents may impose implementation-specific limits on otherwise unconstrained inputs, e.g. to prevent denial of service attacks, to guard against running out of memory, or to work around platform-specific limitations. For compatibility with existing content and prior specifications, this specification describes two authoring formats: one based on XML (referred to as <dfn id="xhtml5" title= "XHTML">XHTML5</dfn> ), and one using a <a href="#parsing">custom format</a> inspired by SGML (referred to as <dfn id= "html5">HTML5</dfn> ). Implementations may support only one of these two formats, although supporting both is encouraged. <a href="#xhtml5">XHTML</a> documents ( <a href="#xml-documents">XML documents</a> using elements from the <a href="#html-namespace0">HTML namespace</a> ) that use the new features described in this specification and that are served over the wire (e.g. by HTTP) must be sent using an XML MIME type such as <code>application/xml</code> or <code>application/xhtml+xml</code> and must not be served as <code>text/html</code> . <a href= "#references">[RFC3023]</a> Such XML documents may contain a <code>DOCTYPE</code> if desired, but this is not required to conform to this specification. According to the XML specification, XML processors are not guaranteed to process the external DTD subset referenced in the DOCTYPE. This means, for example, that using <del class= "diff-old">entities</del> <ins class="diff-chg">entity references</ins> for characters in XHTML documents is unsafe (except for <del class="diff-old">&lt;, &gt;, &amp;,</del> <code title=""><ins class= "diff-chg">&lt;</ins></code> ,<code title=""><ins class= "diff-chg">&gt;</ins></code> ,<code title=""><ins class= "diff-chg">&amp;</ins></code> ,<code title="">&quot;</code> and <del class="diff-old">&apos;). For interoperability, authors are advised to avoid optional features of XML.</del> <code title=""><ins class="diff-chg">&apos;</ins></code> <ins class="diff-chg">).</ins> <a href="#html5" title="HTML5">HTML documents</a> , if they are served over the wire (e.g. by HTTP) must be <del class="diff-old">labelled</del> <ins class= "diff-chg">labeled</ins> with the <code>text/html</code> MIME type. The language in this specification assumes that the user agent expands all entity references, and therefore does not include entity reference nodes in the DOM. If user agents do include entity reference nodes in the DOM, then user agents must handle them as if they were fully expanded when implementing this specification. For example, if a requirement talks about an element's child text nodes, then any text nodes that are children of an entity reference that is a child of that element would be used as well. <ins class="diff-chg">Entity references to unknown entities must be treated as if they contained just an empty text node for the purposes of the algorithms defined in this specification.</ins> <h4 id="common"><del class= "diff-old">1.3.1.</del> <ins class="diff-chg">1.3.1</ins> Common conformance requirements for APIs exposed to JavaScript</h4> A lot of arrays/lists/ <a href="#collections0" title="collections">collection</a> s in this spec assume zero-based indexes but use the term " <var title="">index</var> th" liberally. We should define those to be zero-based and be clearer about this. Unless <del class="diff-old">other</del> <ins class= "diff-chg">otherwise</ins> specified, if a DOM attribute that is a floating point number type ( <code title="">float</code> ) is assigned an Infinity or Not-a-Number value, a <code title= "big-issue">NOT_SUPPORTED_ERR</code> exception must be raised. Unless <del class="diff-old">other specified, if a DOM attribute that is a signed numeric type is assigned a negative value, a NOT_SUPPORTED_ERR exception must be raised. Unless other</del> <ins class="diff-chg">otherwise</ins> specified, if a method with an argument that is a floating point number type ( <code title= "">float</code> ) is passed an Infinity or Not-a-Number value, a <code title="big-issue">NOT_SUPPORTED_ERR</code> exception must be raised. Unless <del class="diff-old">other</del> <ins class= "diff-chg">otherwise</ins> specified, if a method is passed fewer arguments than is defined for that method in its IDL definition, a <code title="big-issue">NOT_SUPPORTED_ERR</code> exception must be raised. Unless <del class="diff-old">other</del> <ins class= "diff-chg">otherwise</ins> specified, if a method is passed more arguments than is defined for that method in its IDL definition, the excess arguments must be ignored. <del class="diff-old">Unless other specified, if a method is expecting, as one of its arguments, as defined by its IDL definition, an object implementing a particular interface X , and the argument passed is an object whose [[Class]] property is neither that interface X , nor the name of an interface Y where this specification requires that all objects implementing interface Y also implement interface X , nor the name of an interface that inherits from the expected interface X , then a TYPE_MISMATCH_ERR exception must be raised. Anything else? Passing the wrong type of object, maybe? Implied conversions to int/float?</del> <h4 id="dependencies"><del class= "diff-old">1.3.2.</del> <ins class="diff-chg">1.3.2</ins> Dependencies</h4> This specification relies on several other underlying specifications. <dl> <dt>XML</dt> <dd> Implementations that support XHTML5 must support some version of XML, as well as its corresponding namespaces specification, because XHTML5 uses an XML <del class="diff-old">serialisation</del> <ins class="diff-chg">serialization</ins> with namespaces. <a href= "#references">[XML]</a> <a href="#references">[XMLNAMES]</a> </dd> <dt>XML Base</dt> <dd> User agents must follow the rules given by XML Base to resolve relative URIs in HTML and XHTML fragments. That is the mechanism used in this specification for resolving relative URIs in DOM trees. <a href="#references">[XMLBASE]</a> It is possible for <code title= "attr-xml-base"><a href="#xmlbase">xml:base</a></code> attributes to be present even in HTML fragments, as such attributes can be added dynamically using script. <ins class="diff-new">(Such scripts would not be conforming, however, as</ins> <code title= "attr-xml-base"><a href="#xmlbase"><ins class= "diff-new">xml:base</ins></a></code> <ins class= "diff-new">attributes as not allowed in</ins> <a href= "#html-"><ins class="diff-new">HTML documents</ins></a> .) </dd> <dt>DOM</dt> <dd> Implementations must support some version of DOM Core and DOM Events, because this specification is defined in terms of the DOM, and some of the features are defined as extensions to the DOM Core interfaces. <a href="#references">[DOM3CORE]</a> <a href= "#references">[DOM3EVENTS]</a> </dd> <dt>ECMAScript</dt> <dd> Implementations that use ECMAScript to implement the APIs defined in this specification must implement them in a manner consistent with the ECMAScript Bindings <del class="diff-old">for DOM Specifications</del> <ins class="diff-chg">defined in the Web IDL</ins> specification, as this specification uses that specification's terminology. <a href="#references"><del class= "diff-old">[EBFD]</del> <ins class= "diff-chg">[WebIDL]</ins></a> </dd> <dt id="mq"><ins class="diff-chg">Media Queries</ins></dt> <dd> <ins class="diff-chg">Implementations must support some version of the Media Queries language. However, when applying the rules of the Media Queries specification to media queries found in content attributes of</ins> <a href="#html-elements"><ins class= "diff-chg">HTML elements</ins></a> ,<ins class="diff-chg">user agents must act as if all U+000B LINE TABULATION characters in the attribute were in fact U+0020 SPACE characters. This is required to provide a consistent processing of</ins> <a href="#space" title= "space character"><ins class="diff-chg">space characters</ins></a> <ins class="diff-chg">in HTML.</ins> <a href= "#references"><ins class="diff-chg">[MQ]</ins></a> </dd> </dl> This specification does not require support of any particular network transport protocols, style sheet language, scripting language, or any of the DOM and WebAPI specifications beyond those described above. However, the language described by this specification is biased towards CSS as the styling language, ECMAScript as the scripting language, and HTTP as the network protocol, and several features assume that those languages and protocols are in use. This specification might have certain additional requirements on character encodings, image formats, audio formats, and video formats in the respective sections. <h4 id="features"><del class= "diff-old">1.3.3.</del> <ins class="diff-chg">1.3.3</ins> Features defined in other specifications</h4> Some elements are defined in terms of their DOM <dfn id= "textcontent"><code>textContent</code></dfn> attribute. This is an attribute defined on the <code>Node</code> interface in DOM3 Core. <a href="#references">[DOM3CORE]</a> Should textContent be defined differently for dir="" and <bdo> ? Should we come up with an alternative to textContent that handles those and other things, like alt=""? The interface <dfn id= "domtimestamp"><code>DOMTimeStamp</code></dfn> is defined in DOM3 Core. <a href="#references">[DOM3CORE]</a> The term <dfn id="activation0">activation behavior</dfn> is used as defined in the DOM3 Events specification. <a href= "#references">[DOM3EVENTS]</a> At the time of writing, DOM3 Events hadn't yet been updated to define that phrase. The rules for handling alternative style sheets are defined in the CSS object model specification. <a href="#references">[CSSOM]</a> See <del class= "diff-old">http://dev.w3.org/cvsweb/~checkout~/csswg/cssom/Overview.html?rev=1.35&content-type=text/html;%20charset=utf-8</del> <a href= "http://dev.w3.org/cvsweb/~checkout~/csswg/cssom/Overview.html?content-type=text/html;%20charset=utf-8"> <ins class= "diff-chg">http://dev.w3.org/cvsweb/~checkout~/csswg/cssom/Overview.html?content-type=text/html;%20charset=utf-8</ins></a> Certain features are defined in terms of CSS <color> values. When the CSS value <code title="">currentColor</code> is specified in this context, the "computed value of the 'color' property" for the purposes of determining the computed value of the <code title="">currentColor</code> keyword is the computed value of the 'color' property on the element in question. <a href= "#references">[CSS3COLOR]</a> If a canvas gradient's <code title= "dom-canvasgradient-addColorStop"><a href= "#addcolorstop">addColorStop()</a></code> method is called with the <code title="">currentColor</code> keyword as the color, then the computed value of the 'color' property on the <code><a href= "#canvas">canvas</a></code> element is the one that is used. <h3 id="terminology"><del class= "diff-old">1.4.</del> <ins class="diff-chg">1.4</ins> Terminology</h3> This specification refers to both HTML and XML attributes and DOM attributes, often in the same context. When it is not clear which is being referred to, they are referred to as <dfn id= "content">content attributes</dfn> for HTML and XML attributes, and <dfn id="dom-attributes">DOM attributes</dfn> for those from the DOM. Similarly, the term "properties" is used for both ECMAScript object properties and CSS properties. When these are ambiguous they are qualified as object properties and CSS properties respectively. To ease migration from HTML to XHTML, UAs conforming to this specification will place elements in HTML in the <code>http://www.w3.org/1999/xhtml</code> namespace, at least for the purposes of the DOM and CSS. The term " <dfn id= "elements1">elements in the HTML namespace</dfn> ", or " <dfn id= "html-elements">HTML elements</dfn> " for short, when used in this specification, thus refers to both HTML and XHTML elements. Unless otherwise stated, all elements defined or mentioned in this specification are in the <code>http://www.w3.org/1999/xhtml</code> namespace, and all attributes defined or mentioned in this specification have no namespace (they are in the per-element partition). The term <a href="#html-">HTML documents</a> is sometimes used in contrast with <a href="#xml-documents">XML documents</a> to <del class="diff-old">mean</del> specifically <ins class= "diff-new">mean</ins> documents that were parsed using an <a href= "#html-0">HTML parser</a> (as opposed to using an XML parser or created purely through the DOM). Generally, when the specification states that a feature applies to HTML or XHTML, it also includes the other. When a feature specifically only applies to one of the two languages, it is called out by explicitly stating that it does not apply to the other format, as in "for HTML, ... (this does not apply to XHTML)". This specification uses the term document to refer to any use of HTML, ranging from short static documents to long essays or reports with rich multimedia, as well as to fully-fledged interactive applications. For readability, the term URI is used to refer to both ASCII URIs and Unicode IRIs, as those terms are defined by RFC 3986 and RFC 3987 respectively. On the rare occasions where IRIs are not allowed but ASCII URIs are, this is called out explicitly. <a href= "#references">[RFC3986]</a> <a href="#references">[RFC3987]</a> The term <dfn id="root-element">root element</dfn> , when not <del class="diff-old">qualified to</del> explicitly <del class= "diff-old">refer</del> <ins class="diff-chg">qualified as referring</ins> to the document's root element, means the furthest ancestor element node of whatever node is being discussed, or the node itself <del class="diff-old">is there is none.</del> <ins class="diff-chg">if it has no ancestors.</ins> When the node is a part of the document, then that is indeed the document's root <del class="diff-old">element. However,</del> <ins class= "diff-chg">element; however,</ins> if the node is not currently part of the document tree, the root element will be an orphaned node. An element is said to have been <dfn id="inserted" title= "insert an element into a document">inserted into a document</dfn> when its <a href="#root-element">root element</a> changes and is now the document's <a href="#root-element">root element</a> . The term <dfn id="tree-order">tree order</dfn> means a pre-order, depth-first traversal of DOM nodes involved (through the <code title="">parentNode</code> / <code title="">childNodes</code> relationship). When it is stated that some element or attribute is <dfn id= "ignored" title="ignore">ignored</dfn> , or treated as some other value, or handled as if it was something else, this refers only to the processing of the node after it is in the DOM. A user agent must not mutate the DOM in such situations. When an XML name, such as an attribute or element name, is referred to in the form <code><var title="">prefix</var> : <var title="">localName</var></code> , as in <code>xml:id</code> or <code>svg:rect</code> , it refers to a name with the local name <var title="">localName</var> and the namespace given by the prefix, as defined by the following table: <dl> <dt><code title="">xml</code></dt> <dd><code>http://www.w3.org/XML/1998/namespace</code></dd> <dt><code title="">html</code></dt> <dd><code>http://www.w3.org/1999/xhtml</code></dd> <dt><code title="">svg</code></dt> <dd><code>http://www.w3.org/2000/svg</code></dd> </dl> For simplicity, terms such as shown , displayed , and visible might sometimes be used when referring to the way a document is rendered to the user. These terms are not meant to imply a visual medium; they must be considered to apply to other media in equivalent ways. <del class="diff-old">Various</del> DOM interfaces <del class= "diff-old">are</del> defined in this specification <del class= "diff-old">using pseudo-IDL. This looks like OMG IDL but isn't. For instance, method overloading is used, and types from the W3C DOM specifications are used without qualification. Language-specific bindings for these abstract interface definitions</del> <ins class= "diff-chg">use Web IDL. User agents</ins> must <del class= "diff-old">be derived in the way consistent with W3C DOM specifications. Some interface-specific binding information for ECMAScript is included in this specification. The current situation with IDL blocks is pitiful. IDL is totally inadequate to properly represent what objects have to look like in JS; IDL can't say if a member is enumerable, what the indexing behaviour is, what the stringification behaviour is, what behaviour setting a member whose type is a particular interface should be (e.g. setting of document.location or element.className), what constructor an object implementing an interface should claim to have, how overloads work, etc. I think we should make</del> <ins class="diff-chg">implement these interfaces as defined by</ins> the <ins class= "diff-new">Web</ins> IDL <del class="diff-old">blocks non-normative, and/or replace them with something else that is better for JS while still being clear on how it applies to other languages. However, we do need to have something that says what types the methods take as arguments, since we have to raise exceptions if they are wrong.</del> <ins class= "diff-chg">specification.</ins> <a href="#references"><ins class= "diff-chg">[WEBIDL]</ins></a> The construction "a <code>Foo</code> object", where <code>Foo</code> is actually an interface, is sometimes used instead of the more accurate "an object implementing the interface <code>Foo</code> ". A DOM attribute is said to be getting when its value is being retrieved (e.g. by author script), and is said to be setting when a new value is assigned to it. If a DOM object is said to be <dfn id="live">live</dfn> , then that means that any attributes returning that object must always return the same object (not a new object each time), and the attributes and methods on that object must operate on the actual underlying data, not a snapshot of the data. The terms fire and dispatch are used interchangeably in the context of events, as in the DOM Events specifications. <a href="#references">[DOM3EVENTS]</a> The term <dfn id="text-node">text node</dfn> refers to any <code>Text</code> node, including <code>CDATASection</code> <del class="diff-old">nodes (any</del> <ins class="diff-chg">nodes; specifically, any</ins> <code>Node</code> with node type <del class="diff-old">3</del> <code title=""><ins class= "diff-chg">TEXT_NODE</ins></code> <ins class="diff-chg">(3)</ins> or <del class="diff-old">4).</del> <code title=""><ins class= "diff-chg">CDATA_SECTION_NODE</ins></code> <ins class= "diff-chg">(4).</ins> <a href="#references"><ins class= "diff-chg">[DOM3CORE]</ins></a> <ins class="diff-chg">The term</ins> <dfn id= "plugin"><ins class="diff-chg">plugin</ins></dfn> <ins class= "diff-chg">is used to mean any content handler, typically a third-party content handler, for Web content types that are not supported by the user agent natively, or for content types that do not expose a DOM, that supports rendering the content as part of the user agent's interface.</ins> <ins class="diff-chg">One example of a plugin would be a PDF viewer that is instantiated in a</ins> <a href= "#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">when the user navigates to a PDF file. This would count as a plugin regardless of whether the party that implemented the PDF viewer component was the same as that which implemented the user agent itself. However, a PDF viewer application that launches separate from the user agent (as opposed to using the same interface) is not a plugin by this definition.</ins> <ins class="diff-chg">This specification does not define a mechanism for interacting with plugins, as it is expected to be user-agent- and platform-specific. Some UAs might opt to support a plugin mechanism such as the Netscape Plugin API; others might use remote content converters or have built-in support for certain types.</ins> <a href="#references"><ins class= "diff-chg">[NPAPI]</ins></a> <ins class="diff-chg">Browsers should take extreme care when interacting with external content intended for</ins> <a href="#plugin" title="plugin"><ins class= "diff-chg">plugins</ins></a> .<ins class="diff-chg">When third-party software is run with the same privileges as the user agent itself, vulnerabilities in the third-party software become as dangerous as those in the user agent.</ins> Some of the algorithms in this specification, for historical reasons, require the user agent to <dfn id="pause">pause</dfn> until some condition has been met. While a user agent is paused, it must ensure that no scripts execute (e.g. no event handlers, no timers, etc). User agents should remain responsive to user input while paused, <del class="diff-old">however.</del> <ins class= "diff-chg">however, albeit without letting the user interact with Web pages where that would involve invoking any script.</ins> <h4 id="html-vs"><del class= "diff-old">1.4.1.</del> <ins class="diff-chg">1.4.1</ins> HTML vs XHTML</h4> This section is non-normative. This specification defines an abstract language for describing documents and applications, and some APIs for interacting with in-memory representations of resources that use this language. The in-memory representation is known as "DOM5 HTML", or "the DOM" for short. There are various concrete syntaxes that can be used to transmit resources that use this abstract language, two of which are defined in this specification. The first such concrete syntax is "HTML5". This is the format recommended for most authors. It is compatible with all legacy Web browsers. If a document is transmitted with the MIME type <code title="">text/html</code> , then it will be processed as an "HTML5" document by Web browsers. The second concrete syntax uses XML, and is known as "XHTML5". When a document is transmitted with an XML MIME type, such as <code title="">application/xhtml+xml</code> , then it is processed by an XML processor by Web browsers, and treated as an "XHTML5" document. Authors are reminded that the processing for XML and HTML differs; in particular, even minor syntax errors will prevent an XML document from being rendered fully, whereas they would be ignored in the "HTML5" syntax. The "DOM5 HTML", "HTML5", and "XHTML5" representations cannot all represent the same content. For example, namespaces cannot be represented using "HTML5", but they are supported in "DOM5 HTML" and "XHTML5". Similarly, documents that use the <code><a href= "#noscript">noscript</a></code> feature can be represented using "HTML5", but cannot be represented with "XHTML5" and "DOM5 HTML". Comments that contain the string " <code title="">--></code> " can be represented in "DOM5 HTML" but not in "HTML5" and "XHTML5". And so forth. <h2 id="dom">2. The Document Object Model</h2> The Document Object Model (DOM) is a representation — a model — of a document and its content. <a href="#references">[DOM3CORE]</a> The DOM is not just an API; the conformance criteria of HTML implementations are defined, in this specification, in terms of operations on the DOM. This specification defines the language represented in the DOM by features together called DOM5 HTML. DOM5 HTML consists of DOM Core <code>Document</code> nodes and DOM Core <code>Element</code> nodes, along with text nodes and other content. Elements in the DOM represent things; that is, they have intrinsic meaning , also known as semantics. For example, an <code><a href= "#ol">ol</a></code> element represents an ordered list. In addition, documents and elements in the DOM host APIs that extend the DOM Core APIs, providing new features to application developers using DOM5 HTML. <h3 id="documents"><del class= "diff-old">2.1.</del> <ins class="diff-chg">2.1</ins> Documents</h3> Every XML and HTML document in an HTML UA is represented by a <code>Document</code> object. <a href= "#references">[DOM3CORE]</a> <code>Document</code> objects are assumed to be <dfn id= "xml-documents">XML documents</dfn> unless they are flagged as being <dfn id="html-">HTML documents</dfn> when they are created. Whether a document is an <a href="#html-" title= "HTML documents">HTML document</a> or an <a href="#xml-documents" title="XML documents">XML document</a> affects the <del class= "diff-old">behaviour</del> <ins class="diff-chg">behavior</ins> of certain APIs, as well as a few CSS rendering rules. <a href= "#references">[CSS21]</a> A <code>Document</code> object created by the <code title="">createDocument()</code> API on the <code>DOMImplementation</code> object is initially an <a href= "#xml-documents" title="XML documents">XML document</a> , but can be made into an <a href="#html-" title="HTML documents">HTML document</a> by calling <code title="dom-document-open"><a href= "#open">document.open()</a></code> on it. All <code>Document</code> objects (in user agents implementing this specification) must also implement the <code><a href= "#htmldocument">HTMLDocument</a></code> interface, available using binding-specific methods. (This is the case whether or not the document in question is an <a href="#html-" title= "HTML documents">HTML document</a> or indeed whether it contains any <a href="#html-elements">HTML elements</a> at all.) <code>Document</code> objects must also implement the document-level interface of any other namespaces found in the document that the UA supports. For example, if an HTML implementation also supports SVG, then the <code>Document</code> object must implement <code><a href= "#htmldocument">HTMLDocument</a></code> and <code>SVGDocument</code> . Because the <code><a href= "#htmldocument">HTMLDocument</a></code> interface is now obtained using binding-specific casting methods instead of simply being the primary interface of the document object, it is no longer defined as inheriting from <code>Document</code> . <pre class="idl"> interface <dfn id="htmldocument">HTMLDocument</dfn> { // <a href="#resource0">Resource metadata management</a> <del class="diff-old"> readonly attribute ; </del> <ins class= "diff-chg"> [PutForwards=href] readonly attribute <a href= "#location2">Location</a> <a href="#location0" title= "dom-document-location">location</a>; </ins> readonly attribute DOMString <a href="#url" title= "dom-document-URL">URL</a>; attribute DOMString <a href="#domain" title= "dom-document-domain">domain</a>; readonly attribute DOMString <a href="#referrer" title= "dom-document-referrer">referrer</a>; attribute DOMString <a href="#cookie0" title= "dom-document-cookie">cookie</a>; readonly attribute DOMString <a href="#lastmodified" title= "dom-document-lastModified">lastModified</a>; readonly attribute DOMString <a href="#compatmode" title= "dom-document-compatMode">compatMode</a>; <ins class="diff-new"> attribute DOMString <a href= "#charset0" title="dom-document-charset">charset</a>; readonly attribute DOMString <a href="#characterset" title= "dom-document-characterSet">characterSet</a>; readonly attribute DOMString <a href="#defaultcharset" title= "dom-document-defaultCharset">defaultCharset</a>; readonly attribute DOMString <a href="#readystate" title= "dom-document-readyState">readyState</a>; </ins> // <a href="#dom-tree0">DOM tree accessors</a> attribute DOMString <a href="#document.title" title= "dom-document-title">title</a>; attribute DOMString <a href="#dir1" title= "dom-document-dir">dir</a>; attribute <a href= "#htmlelement">HTMLElement</a> <a href="#body" title= "dom-document-body">body</a>; readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#images0" title= "dom-document-images">images</a>; <ins class="diff-chg"> readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#embeds" title= "dom-document-embeds">embeds</a>; readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#plugins" title= "dom-document-plugins">plugins</a>; </ins> readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#links0" title= "dom-document-links">links</a>; readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#forms0" title= "dom-document-forms">forms</a>; readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#anchors" title= "dom-document-anchors">anchors</a>; <ins class="diff-new"> readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#scripts" title= "dom-document-scripts">scripts</a>; </ins> NodeList <a href="#getelementsbyname" title= "dom-document-getElementsByName">getElementsByName</a>(in DOMString elementName); NodeList <a href="#getelementsbyclassname" title= "dom-document-getElementsByClassName">getElementsByClassName</a>(in DOMString classNames); // <a href="#dynamic2">Dynamic markup insertion</a> attribute DOMString <a href="#innerhtml" title= "dom-innerHTML">innerHTML</a>; <a href="#htmldocument">HTMLDocument</a> <a href="#open" title= "dom-document-open">open</a>(); <a href="#htmldocument">HTMLDocument</a> <a href="#open" title= "dom-document-open">open</a>(in DOMString type); <a href="#htmldocument">HTMLDocument</a> <a href="#open" title= "dom-document-open">open</a>(in DOMString type, in DOMString replace); <a href="#window">Window</a> <a href="#open" title= "dom-document-open">open</a>(in DOMString url, in DOMString name, in DOMString features); <a href="#window">Window</a> <a href="#open" title= "dom-document-open">open</a>(in DOMString url, in DOMString name, in DOMString features, in boolean replace); void <a href="#close" title="dom-document-close">close</a>(); void <a href="#document.write" title= "dom-document-write">write</a>(in DOMString text); void <a href="#document.writeln..." title= "dom-document-writeln">writeln</a>(in DOMString text); // <a href="#interaction0">Interaction</a> readonly attribute Element <a href="#activeelement" title="dom-document-activeElement">activeElement</a>; <del class="diff-old"> readonly attribute boolean ; </del> <ins class="diff-chg"> boolean <a href="#hasfocus" title= "dom-document-hasFocus">hasFocus</a>(); </ins> // <a href="#command1" title="concept-command">Commands</a> readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#commands0" title= "dom-document-commands">commands</a>; // <a href="#editing0">Editing</a> attribute boolean <a href="#designMode" title= "dom-document-designMode">designMode</a>; boolean <a href="#execCommand" title= "dom-document-execCommand">execCommand</a>(in DOMString commandId); <del class= "diff-old"> boolean (in DOMString commandId, in boolean doShowUI); boolean (in DOMString commandId, in boolean doShowUI, in DOMString value); </del> <ins class="diff-chg"> boolean <a href="#execCommand" title= "dom-document-execCommand">execCommand</a>(in DOMString commandId, in boolean showUI); boolean <a href="#execCommand" title= "dom-document-execCommand">execCommand</a>(in DOMString commandId, in boolean showUI, in DOMString value); boolean <a href="#querycommandenabled" title= "dom-document-queryCommandEnabled">queryCommandEnabled</a>(in DOMString commandId); boolean <a href="#querycommandindeterm" title= "dom-document-queryCommandIndeterm">queryCommandIndeterm</a>(in DOMString commandId); boolean <a href="#querycommandstate" title= "dom-document-queryCommandState">queryCommandState</a>(in DOMString commandId); boolean <a href="#querycommandsupported" title= "dom-document-queryCommandSupported">queryCommandSupported</a>(in DOMString commandId); DOMString <a href="#querycommandvalue" title= "dom-document-queryCommandValue">queryCommandValue</a>(in DOMString commandId); </ins> <a href="#selection1">Selection</a> <a href="#getselection0" title="dom-document-getSelection">getSelection</a>(); }; </pre> Since the <code><a href="#htmldocument">HTMLDocument</a></code> interface holds methods and attributes related to a number of disparate features, the members of this interface are described in various different sections. <h4 id="security"><del class= "diff-old">2.1.1.</del> <ins class="diff-chg">2.1.1</ins> Security</h4> User agents must raise a <a href="#security9">security exception</a> whenever any of the members of an <code><a href= "#htmldocument">HTMLDocument</a></code> object are accessed by scripts whose <a href="#effective3"><ins class="diff-chg">effective script</ins> origin</a> is not the <a href="#same-origin" title= "same origin">same</a> as the <code>Document</code> 's <del class= "diff-old">origin.</del> <a href="#effective3"><ins class= "diff-chg">effective script origin</ins></a> . <h4 id="resource"><del class= "diff-old">2.1.2.</del> <ins class="diff-chg">2.1.2</ins> <dfn id="resource0">Resource metadata management</dfn></h4> The <dfn id="url" title= "dom-document-URL"><code>URL</code></dfn> attribute must return the document's address . The <dfn id="referrer" title= "dom-document-referrer"><code><del class="diff-old">domain</del> <ins class="diff-chg">referrer</ins></code></dfn> attribute must <del class="diff-old">be initialised to the document's domain , if it has one, and null otherwise. On getting, the attribute must</del> return <del class="diff-old">its current value. On setting, if the new value is an allowed value (as defined below), the attribute's value must be changed to the new value. If</del> <ins class="diff-chg">either</ins> the <del class="diff-old">new value is not an allowed value, then a security exception must be raised instead. A new value is an allowed value for</del> <ins class="diff-chg">URI of</ins> the <del class= "diff-old">document.domain</del> <a href="#active"><ins class= "diff-chg">active document</ins></a> <del class= "diff-old">attribute if it is equal to the attribute's current value, or if the new value, prefixed by a U+002E FULL STOP ("."), exactly matches the end</del> of the <del class="diff-old">current value. If the current value is null, new values other than null will never be allowed. If the Document object's address is hierarchical and uses a server-based naming authority, then its domain is the <host>/<ihost> part of that address. Otherwise, it has no domain. The domain</del> <a href= "#source0"><ins class="diff-chg">source browsing context</ins></a> <del class="diff-old">attribute is used to enable pages on different hosts of a domain to access each others' DOMs , though this is not yet defined by this specification . we should handle IP addresses here The referrer attribute must return either</del> <ins class="diff-chg">at</ins> the <del class="diff-old">URI of</del> <ins class="diff-chg">time the navigation was started (that is,</ins> the page which <a href="#navigate" title= "navigate">navigated</a> the <a href="#browsing1">browsing context</a> to the current <del class="diff-old">document (if any),</del> <ins class="diff-chg">document),</ins> or the empty string if there is no such originating page, or if the UA has been configured not to report <del class="diff-old">referrers,</del> <ins class="diff-chg">referrers in this case,</ins> or if the navigation was initiated for a <a href="#hyperlinks">hyperlink</a> with a <code title="rel-noreferrer"><a href= "#noreferrer">noreferrer</a></code> keyword. In the case of HTTP, the <code title= "dom-document-referrer"><a href="#referrer">referrer</a></code> DOM attribute will match the <code title="">Referer</code> (sic) header that was sent when fetching the current page. <ins class="diff-new">Typically user agents are configured to not report referrers in the case where the referrer uses an encrypted protocol and the current page does not (e.g. when navigating from an</ins> <code title=""><ins class= "diff-new">https:</ins></code> <ins class="diff-new">page to an</ins> <code title=""><ins class="diff-new">http:</ins></code> <ins class="diff-new">page).</ins> The <dfn id="cookie0" title= "dom-document-cookie"><code>cookie</code></dfn> attribute <del class="diff-old">must, on</del> <ins class= "diff-chg">represents the cookies of the resource.</ins> <ins class="diff-chg">On</ins> getting, <ins class="diff-new">if the</ins> <a href= "#sandboxed2"><ins class="diff-new">sandboxed origin browsing context flag</ins></a> <ins class="diff-new">is set on the</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">of the document, the user agent must raise a</ins> <a href="#security9"><ins class= "diff-new">security exception</ins></a> .<ins class= "diff-new">Otherwise, it must</ins> return the same string as the value of the <code title="">Cookie</code> HTTP header it would include if fetching the resource indicated by the document's address over HTTP, as per RFC 2109 section 4.3.4. <a href= "#references">[RFC2109]</a> On setting, <ins class="diff-new">if</ins> the <del class= "diff-old">cookie</del> <a href="#sandboxed2"><ins class= "diff-chg">sandboxed origin browsing context flag</ins></a> <del class="diff-old">attribute</del> <ins class="diff-chg">is set on the</ins> <a href="#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">of the document, the user agent</ins> must <del class="diff-old">cause</del> <ins class= "diff-chg">raise a</ins> <a href="#security9"><ins class= "diff-chg">security exception</ins></a> .<ins class= "diff-chg">Otherwise,</ins> the user agent <del class= "diff-old">to</del> <ins class="diff-chg">must</ins> act as it would when processing cookies if it had just attempted to fetch the document's address over HTTP, and had received a response with a <code>Set-Cookie</code> header whose value was the specified value, as per RFC 2109 sections 4.3.1, 4.3.2, and 4.3.3. <a href="#references">[RFC2109]</a> Since the <code title= "dom-document-cookie"><a href="#cookie0">cookie</a></code> attribute is accessible across frames, the path restrictions on cookies are only a tool to help manage which cookies are sent to which parts of the site, and are not in any way a security feature. The <dfn id="lastmodified" title= "dom-document-lastModified"><code>lastModified</code></dfn> attribute, on getting, must return the date and time of the <code>Document</code> 's source file's last modification, in the user's local timezone, in the following format: <ol> <li>The month component of the date.</li> <li>A U+002F SOLIDUS character ('/').</li> <li>The day component of the date.</li> <li>A U+002F SOLIDUS character ('/').</li> <li>The year component of the date.</li> <li>A U+0020 SPACE character.</li> <li>The hours component of the time.</li> <li>A U+003A COLON character (':').</li> <li>The minutes component of the time.</li> <li>A U+003A COLON character (':').</li> <li>The seconds component of the time.</li> </ol> All the numeric components above, other than the year, must be given as two digits in the range U+0030 DIGIT ZERO to U+0039 DIGIT NINE representing the number in base ten, zero-padded if necessary. The <code>Document</code> 's source file's last modification date and time must be derived from relevant features of the networking protocols used, e.g. from the value of the HTTP <code title="">Last-Modified</code> header of the document, or from metadata in the <del class="diff-old">filesystem</del> <ins class= "diff-chg">file system</ins> for local files. If the last modification date and time are not known, the attribute must return the string <code title="">01/01/1970 00:00:00</code> . <ins class="diff-new">A</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">is always set to one of three modes:</ins> <dfn id="no-quirks"><ins class= "diff-new">no quirks mode</ins></dfn> ,<ins class="diff-new">the default;</ins> <dfn id="quirks"><ins class="diff-new">quirks mode</ins></dfn> ,<ins class="diff-new">used typically for legacy documents; and</ins> <dfn id="limited"><ins class= "diff-new">limited quirks mode</ins></dfn> ,<ins class= "diff-new">also known as "almost standards" mode. The mode is only ever changed from the default by the</ins> <a href= "#html-0"><ins class="diff-new">HTML parser</ins></a> ,<ins class= "diff-new">based on the presence, absence, or value of the DOCTYPE string.</ins> The <dfn id="compatmode" title= "dom-document-compatMode"><code>compatMode</code></dfn> DOM attribute must return the literal string " <code title= "">CSS1Compat</code> " unless the document has been set to <a href= "#quirks">quirks mode</a> by the <a href="#html-0">HTML parser</a> , in which case it must instead return the literal string " <code title="">BackCompat</code> ". <del class="diff-old">The document can also be set to limited quirks mode (also known as "almost standards" mode). By default, the document is set to no quirks mode (also known as "standards mode").</del> <div class="big-issue"> As far as parsing goes, the quirks I know of are: <ul> <li>Comment parsing is different.</li> <li><code><a href="#p">p</a></code> can contain <code><a href= "#table">table</a></code></li> <li>Safari and IE have special parsing rules for <% ... %> (even in standards mode, though clearly this should be quirks-only).</li> </ul> </div> <ins class="diff-new">Documents have an associated</ins> <dfn id="character1" title= "document's character encoding"><ins class="diff-new">character encoding</ins></dfn> .<ins class="diff-new">When a</ins> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">object is created, the</ins> <a href= "#character1"><ins class="diff-new">document's character encoding</ins></a> <ins class="diff-new">must be initialized to UTF-16. Various algorithms during page loading affect this value, as does the</ins> <code title="dom-document-charset"><a href= "#charset0"><ins class="diff-new">charset</ins></a></code> <ins class="diff-new">setter.</ins> <a href= "#references"><ins class="diff-new">[IANACHARSET]</ins></a> <ins class="diff-new">The</ins> <dfn id="charset0" title= "dom-document-charset"><code><ins class= "diff-new">charset</ins></code></dfn> <ins class="diff-new">DOM attribute must, on getting, return the preferred MIME name of the</ins> <a href="#character1"><ins class="diff-new">document's character encoding</ins></a> .<ins class="diff-new">On setting, if the new value is an IANA-registered alias for a character encoding, the</ins> <a href="#character1"><ins class="diff-new">document's character encoding</ins></a> <ins class="diff-new">must be set to that character encoding. (Otherwise, nothing happens.)</ins> <ins class="diff-new">The</ins> <dfn id="characterset" title= "dom-document-characterSet"><code><ins class= "diff-new">characterSet</ins></code></dfn> <ins class= "diff-new">DOM attribute must, on getting, return the preferred MIME name of the</ins> <a href="#character1"><ins class= "diff-new">document's character encoding</ins></a> . <ins class="diff-new">The</ins> <dfn id="defaultcharset" title= "dom-document-defaultCharset"><code><ins class= "diff-new">defaultCharset</ins></code></dfn> <ins class= "diff-new">DOM attribute must, on getting, return the preferred MIME name of a character encoding, possibly the user's default encoding, or an encoding associated with the user's current geographical location, or any arbitrary encoding name.</ins> <ins class="diff-new">Each document has a</ins> <dfn id= "current"><ins class="diff-new">current document readiness</ins></dfn> .<ins class="diff-new">When a</ins> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">object is created, it must have its</ins> <a href= "#current"><ins class="diff-new">current document readiness</ins></a> <ins class="diff-new">set to the string "loading". Various algorithms during page loading affect this value. When the value is set, the user agent must</ins> <a href= "#firing2"><ins class="diff-new">fire a simple event</ins></a> <ins class="diff-new">called</ins> <code title= "event-readystatechanged"><ins class= "diff-new">readystatechanged</ins></code> <ins class="diff-new">at the</ins> <code><ins class="diff-new">Document</ins></code> <ins class="diff-new">object.</ins> <ins class="diff-new">The</ins> <dfn id="readystate" title= "dom-document-readyState"><code><ins class= "diff-new">readyState</ins></code></dfn> <ins class="diff-new">DOM attribute must, on getting, return the</ins> <a href= "#current"><ins class="diff-new">current document readiness</ins></a> . <h3 id="elements"><del class= "diff-old">2.2.</del> <ins class="diff-chg">2.2</ins> Elements</h3> The nodes representing <a href="#html-elements">HTML elements</a> in the DOM must implement, and expose to scripts, the interfaces listed for them in the relevant sections of this specification. This includes <a href="#xhtml5">XHTML</a> elements in <a href="#xml-documents">XML documents</a> , even when those documents are in another context (e.g. inside an XSLT transform). The basic interface, from which all the <a href= "#html-elements">HTML elements</a> ' interfaces inherit, and which must be used by elements that have no additional requirements, is the <code><a href="#htmlelement">HTMLElement</a></code> interface. <pre class="idl"> interface <dfn id= "htmlelement">HTMLElement</dfn> : Element { // <a href="#dom-tree0">DOM tree accessors</a> NodeList <a href="#getelementsbyclassname0" title= "dom-getElementsByClassName">getElementsByClassName</a>(in DOMString classNames); // <a href="#dynamic2">dynamic markup insertion</a> attribute DOMString <a href="#innerhtml" title= "dom-innerHTML">innerHTML</a>; // metadata attributes attribute DOMString <a href="#id0" title= "dom-id">id</a>; attribute DOMString <a href="#title0" title= "dom-title">title</a>; attribute DOMString <a href="#lang0" title= "dom-lang">lang</a>; attribute DOMString <a href="#dir0" title= "dom-dir">dir</a>; attribute DOMString <a href="#classname" title="dom-className">className</a>; readonly attribute <a href= "#domtokenlist0">DOMTokenList</a> <a href="#classlist" title= "dom-classList">classList</a>; <ins class="diff-new"> readonly attribute <a href= "#domstringmap0">DOMStringMap</a> <a href="#dataset" title= "dom-dataset">dataset</a>; </ins> // <a href="#interaction0">interaction</a> attribute boolean <a href="#irrelevant0" title= "dom-irrelevant">irrelevant</a>; attribute long <a href="#tabindex0" title= "dom-tabindex">tabIndex</a>; void <a href="#click" title="dom-click">click</a>(); void <a href="#focus0" title="dom-focus">focus</a>(); void <a href="#blur" title="dom-blur">blur</a>(); void <a href="#scrollintoview" title= "dom-scrollIntoView">scrollIntoView</a>(); void <a href="#scrollintoview" title= "dom-scrollIntoView">scrollIntoView</a>(in boolean top); // <a href="#command1" title="concept-command">commands</a> attribute <a href= "#htmlmenuelement">HTMLMenuElement</a> <a href="#contextmenu0" title="dom-contextMenu">contextMenu</a>; // <a href="#editing0">editing</a> attribute boolean <a href="#draggable0" title= "dom-draggable">draggable</a>; attribute DOMString <a href="#contenteditable1" title= "dom-contentEditable">contentEditable</a>; <ins class="diff-new"> readonly attribute DOMString <a href= "#iscontenteditable" title= "dom-isContentEditable">isContentEditable</a>; // styling readonly attribute CSSStyleDeclaration <a href= "#style0" title="dom-style">style</a>; </ins> // data templates attribute DOMString <a href="#template0" title= "dom-template">template</a>; readonly attribute HTMLDataTemplateElement <a href= "#templateelement" title="dom-templateElement">templateElement</a>; attribute DOMString <a href="#ref0" title= "dom-ref">ref</a>; readonly attribute Node <a href="#refnode" title= "dom-refNode">refNode</a>; attribute DOMString <a href="#registrationmark0" title= "dom-registrationMark">registrationMark</a>; readonly attribute DocumentFragment <a href="#originalcontent" title="dom-originalContent">originalContent</a>; <del class="diff-old"> // </del> <ins class="diff-chg"> // <a href= "#event4">event handler DOM attributes</a> </ins> attribute EventListener <a href="#onabort" title="handler-onabort">onabort</a>; attribute EventListener <a href= "#onbeforeunload" title= "handler-onbeforeunload">onbeforeunload</a>; attribute EventListener <a href="#onblur" title="handler-onblur">onblur</a>; attribute EventListener <a href="#onchange" title="handler-onchange">onchange</a>; attribute EventListener <a href="#onclick" title="handler-onclick">onclick</a>; attribute EventListener <a href= "#oncontextmenu" title="handler-oncontextmenu">oncontextmenu</a>; attribute EventListener <a href= "#ondblclick" title="handler-ondblclick">ondblclick</a>; attribute EventListener <a href="#ondrag" title="handler-ondrag">ondrag</a>; attribute EventListener <a href= "#ondragend" title="handler-ondragend">ondragend</a>; attribute EventListener <a href= "#ondragenter" title="handler-ondragenter">ondragenter</a>; attribute EventListener <a href= "#ondragleave" title="handler-ondragleave">ondragleave</a>; attribute EventListener <a href= "#ondragover" title="handler-ondragover">ondragover</a>; attribute EventListener <a href= "#ondragstart" title="handler-ondragstart">ondragstart</a>; attribute EventListener <a href="#ondrop" title="handler-ondrop">ondrop</a>; attribute EventListener <a href="#onerror" title="handler-onerror">onerror</a>; attribute EventListener <a href="#onfocus" title="handler-onfocus">onfocus</a>; attribute EventListener <a href= "#onkeydown" title="handler-onkeydown">onkeydown</a>; attribute EventListener <a href= "#onkeypress" title="handler-onkeypress">onkeypress</a>; attribute EventListener <a href="#onkeyup" title="handler-onkeyup">onkeyup</a>; attribute EventListener <a href="#onload" title="handler-onload">onload</a>; attribute EventListener <a href= "#onmessage" title="handler-onmessage">onmessage</a>; attribute EventListener <a href= "#onmousedown" title="handler-onmousedown">onmousedown</a>; attribute EventListener <a href= "#onmousemove" title="handler-onmousemove">onmousemove</a>; attribute EventListener <a href= "#onmouseout" title="handler-onmouseout">onmouseout</a>; attribute EventListener <a href= "#onmouseover" title="handler-onmouseover">onmouseover</a>; attribute EventListener <a href= "#onmouseup" title="handler-onmouseup">onmouseup</a>; attribute EventListener <a href= "#onmousewheel" title="handler-onmousewheel">onmousewheel</a>; attribute EventListener <a href="#onresize" title="handler-onresize">onresize</a>; attribute EventListener <a href="#onscroll" title="handler-onscroll">onscroll</a>; attribute EventListener <a href="#onselect" title="handler-onselect">onselect</a>; <ins class= "diff-new"> attribute EventListener <a href= "#onstorage" title="handler-onstorage">onstorage</a>; </ins> attribute EventListener <a href="#onsubmit" title="handler-onsubmit">onsubmit</a>; attribute EventListener <a href="#onunload" title="handler-onunload">onunload</a>; }; </pre> As with the <code><a href= "#htmldocument">HTMLDocument</a></code> interface, the <code><a href="#htmlelement">HTMLElement</a></code> interface holds methods and attributes related to a number of disparate features, and the members of this interface are therefore described in various different sections of this specification. <h4 id="reflecting"><del class= "diff-old">2.2.1.</del> <ins class="diff-chg">2.2.1</ins> Reflecting content attributes in DOM attributes</h4> Some DOM attributes are defined to <dfn id="reflect">reflect</dfn> a particular content attribute . This means that on getting, the DOM attribute returns the current value of the content attribute, and on setting, the DOM attribute changes the value of the content attribute to the given value. If a reflecting DOM attribute is a <code>DOMString</code> attribute whose content attribute is defined to contain a URI, then on getting, the DOM attribute must return the value of the content attribute, resolved to an absolute URI, and on setting, must set the content attribute to the specified literal value. If the content attribute is absent, the DOM attribute must return the default value, if the content attribute has one, or else the empty string. If a reflecting DOM attribute is a <code>DOMString</code> attribute whose content attribute is defined to contain one or more URIs, then on getting, the DOM attribute must split the content attribute on spaces and return the concatenation of each token URI, resolved to an absolute URI, with a single U+0020 SPACE character between each URI; <del class="diff-old">and on setting, must set the content attribute to the specified literal value. If</del> <ins class="diff-chg">if</ins> the content attribute is absent, the DOM attribute must return the default value, if the content attribute has one, or else the empty string. <ins class= "diff-new">On setting, the DOM attribute must set the content attribute to the specified literal value.</ins> If a reflecting DOM attribute is a <code>DOMString</code> whose content attribute is an <a href="#enumerated">enumerated attribute</a> , and the DOM attribute is <dfn id="limited0">limited to only known values</dfn> , then, on getting, the DOM attribute must return the <ins class="diff-new">conforming</ins> value associated with the state the attribute is in (in its canonical case), or the empty string if the attribute is in a state that has no associated keyword value; and on setting, if the new value case-insensitively matches one of the keywords given for that attribute, then the content attribute must be set to <ins class= "diff-new">the conforming value associated with the state</ins> that <ins class="diff-new">the attribute would be in if set to the given new</ins> value, otherwise, if the new value is the empty string, then the content attribute must be removed, otherwise, the setter must raise a <code>SYNTAX_ERR</code> exception. If a reflecting DOM attribute is a <code>DOMString</code> but doesn't fall into any of the above categories, then the getting and setting must be done in a transparent, case-preserving manner. If a reflecting DOM attribute is a boolean attribute, then <ins class="diff-new">on getting</ins> the DOM attribute must return true if the attribute is set, and false if it is absent. On setting, the content attribute must be removed if the DOM attribute is set to false, and must be set to have the same value as its name if the DOM attribute is set to true. (This corresponds to the rules for <a href="#boolean0" title="boolean attribute">boolean content attributes</a> .) If a reflecting DOM attribute is a signed integer type ( <code>long</code> ) <del class="diff-old">then</del> <ins class= "diff-chg">then, on getting,</ins> the content attribute must be parsed according to <a href="#rules0" title= "rules for parsing integers">the rules for parsing signed integers <del class="diff-old">first. If</del></a> , <ins class= "diff-chg">and if</ins> that <ins class="diff-new">is successful, the resulting value must be returned. If, on the other hand, it</ins> fails, or if the attribute is absent, <ins class= "diff-new">then</ins> the default value must be returned instead, or 0 if there is no default value. On setting, the given value must be converted to <del class="diff-old">a</del> <ins class= "diff-chg">the shortest possible</ins> string representing the number as a <a href="#valid0">valid integer</a> in base ten and then that string must be used as the new content attribute value. If a reflecting DOM attribute is an unsigned integer type ( <code>unsigned long</code> ) <del class= "diff-old">then</del> <ins class="diff-chg">then, on getting,</ins> the content attribute must be parsed according to <a href="#rules" title="rules for parsing non-negative integers">the rules for parsing unsigned integers <del class="diff-old">first. If</del></a> , <ins class="diff-chg">and if</ins> that <ins class="diff-new">is successful, the resulting value must be returned. If, on the other hand, it</ins> fails, or if the attribute is absent, the default value must be returned instead, or 0 if there is no default value. On setting, the given value must be converted to <del class= "diff-old">a</del> <ins class="diff-chg">the shortest possible</ins> string representing the number as a <a href= "#valid">valid non-negative integer</a> in base ten and then that string must be used as the new content attribute value. If a reflecting DOM attribute is an unsigned integer type ( <code>unsigned long</code> ) that is <dfn id="limited1">limited to only positive non-zero numbers</dfn> , then the behavior is similar to the previous case, but zero is not allowed. On getting, the content attribute must first be parsed according to <a href= "#rules" title="rules for parsing non-negative integers">the rules for parsing unsigned integers</a> , and if that <ins class= "diff-new">is successful, the resulting value must be returned. If, on the other hand, it</ins> fails, or if the attribute is absent, the default value must be returned instead, or 1 if there is no default value. On setting, if the value is zero, the user agent must fire an <code>INDEX_SIZE_ERR</code> exception. Otherwise, the given value must be converted to <del class="diff-old">a</del> <ins class="diff-chg">the shortest possible</ins> string representing the number as a <a href="#valid">valid non-negative integer</a> in base ten and then that string must be used as the new content attribute value. If a reflecting DOM attribute is a floating point number type ( <code>float</code> ) and the content attribute is defined to contain a time offset, <del class="diff-old">then</del> <ins class= "diff-chg">then, on getting,</ins> the content attribute must be parsed according to <a href="#rules4" title= "rules for parsing time offsets">the rules for parsing time <del class="diff-old">ofsets first.</del> <ins class= "diff-chg">offsets</ins></a> ,<ins class="diff-chg">and if that is successful, the resulting value, in seconds, must be returned.</ins> If that fails, or if the attribute is absent, the default value must be <del class="diff-old">returned instead,</del> <ins class="diff-chg">returned,</ins> or the not-a-number value (NaN) if there is no default value. On setting, the given <del class="diff-old">value</del> <ins class="diff-chg">value, interpreted as a time offset in seconds,</ins> must be converted to a string using the <a href="#time-offset">time offset <del class= "diff-old">serialisation</del> <ins class="diff-chg">serialization rules</ins></a> ,<ins class="diff-chg">and that string must be used as the new content attribute value.</ins> <ins class="diff-chg">If a reflecting DOM attribute is a floating point number type (</ins> <code><ins class= "diff-chg">float</ins></code> <ins class="diff-chg">) and it doesn't fall into one of the earlier categories, then, on getting, the content attribute must be parsed according to</ins> <a href= "#rules1" title= "rules for parsing floating point number values"><ins class= "diff-chg">the</ins> rules <ins class="diff-new">for parsing floating point number values</ins></a> , and <ins class= "diff-new">if that is successful, the resulting value must be returned. If, on the other hand, it fails, or if the attribute is absent, the default value must be returned instead, or 0.0 if there is no default value. On setting, the given value must be converted to the shortest possible string representing the number as a</ins> <a href="#valid1"><ins class="diff-new">valid floating point number</ins></a> <ins class="diff-new">in base ten and then</ins> that string must be used as the new content attribute value. If a reflecting DOM attribute is of the type <code><a href= "#domtokenlist0">DOMTokenList</a></code> , then on getting it must return a <code><a href="#domtokenlist0">DOMTokenList</a></code> object whose underlying string is the element's corresponding content attribute. When the <code><a href= "#domtokenlist0">DOMTokenList</a></code> object mutates its underlying string, the <ins class="diff-new">content</ins> attribute must itself be immediately mutated. When the attribute is absent, then the string represented by the <code><a href= "#domtokenlist0">DOMTokenList</a></code> object is the empty string; when the object mutates this empty string, the user agent must first add the corresponding content attribute, and then mutate that attribute instead. <code><a href= "#domtokenlist0">DOMTokenList</a></code> attributes are always read-only. The same <code><a href= "#domtokenlist0">DOMTokenList</a></code> object must be returned every time for each attribute. If a reflecting DOM attribute has the type <code><a href= "#htmlelement">HTMLElement</a></code> , or an interface that descends from <code><a href="#htmlelement">HTMLElement</a></code> , then, on getting, it must run the following algorithm (stopping at the first point where a value is returned): <ol> <li>If the corresponding content attribute is absent, then the DOM attribute must return null.</li> <li>Let <var title="">candidate</var> be the element that the <code title="">document.getElementById()</code> method would find if it was passed as its argument the current value of the corresponding content attribute.</li> <li>If <var title="">candidate</var> is null, or if it is not type-compatible with the DOM attribute, then the DOM attribute must return null.</li> <li>Otherwise, it must return <var title="">candidate</var> .</li> </ol> On setting, if the given element has an <code title= "attr-id"><a href="#id">id</a></code> attribute, then the content attribute must be set to the value of that <code title= "attr-id"><a href="#id">id</a></code> attribute. Otherwise, the DOM attribute must be set to the empty string. <h3 id="common0"><del class= "diff-old">2.3.</del> <ins class="diff-chg">2.3</ins> Common DOM interfaces</h3> <h4 id="collections"><del class= "diff-old">2.3.1.</del> <ins class="diff-chg">2.3.1</ins> Collections</h4> The <code><a href="#htmlcollection0">HTMLCollection</a></code> , <code><a href= "#htmlformcontrolscollection0">HTMLFormControlsCollection</a></code> , and <code><a href= "#htmloptionscollection0">HTMLOptionsCollection</a></code> interfaces represent various lists of DOM nodes. Collectively, objects implementing these interfaces are called <dfn id= "collections0">collections</dfn> . When a <a href="#collections0" title= "collections">collection</a> is created, a filter and a root are associated with the collection. For example, when the <code><a href= "#htmlcollection0">HTMLCollection</a></code> object for the <code title="dom-document-images"><a href= "#images0">document.images</a></code> attribute is created, it is associated with a filter that selects only <code><a href= "#img">img</a></code> elements, and rooted at the root of the document. The <a href="#collections0" title="collections">collection</a> then <dfn id="represents" title= "represented by the collection">represents</dfn> a <a href= "#live">live</a> view of the subtree rooted at the collection's root, containing only nodes that match the given filter. The view is linear. In the absence of specific requirements to the contrary, the nodes within the collection must be sorted in <a href= "#tree-order">tree order</a> . The <code title="dom-table-rows"><a href= "#rows">rows</a></code> list is not in tree order. An attribute that returns a collection must return the same object every time it is retrieved. <h5 id="htmlcollection">2.3.1.1. HTMLCollection</h5> The <code><a href="#htmlcollection0">HTMLCollection</a></code> interface represents a generic <a href="#collections0" title= "collections">collection</a> of elements. <pre class="idl"> interface <dfn id="htmlcollection0">HTMLCollection</dfn> { readonly attribute unsigned long <a href="#length" title= "dom-HTMLCollection-length">length</a>; <del class="diff-old"> Element (in unsigned long index); Element (in DOMString name); </del> <ins class="diff-chg"> [IndexGetter] Element <a href="#itemindex" title="dom-HTMLCollection-item">item</a>(in unsigned long index); [NameGetter] Element <a href="#nameditem" title= "dom-HTMLCollection-namedItem">namedItem</a>(in DOMString name); </ins> }; </pre> The <dfn id="length" title= "dom-HTMLCollection-length"><code>length</code></dfn> attribute must return the number of nodes <a href="#represents">represented by the collection <del class="diff-old">.</del></a> . The <dfn id="itemindex" title= "dom-HTMLCollection-item"><code>item( <var title="">index</var> )</code></dfn> method must return the <var title="">index</var> th node in the collection. If there is no <var title="">index</var> th node in the collection, then the method must return null. The <dfn id="nameditem" title= "dom-HTMLCollection-namedItem"><code>namedItem( <var title= "">key</var> )</code></dfn> method must return the first node in the collection that matches the following requirements: <ul> <li>It is an <code><a href="#a">a</a></code> , <code><a href= "#applet">applet</a></code> , <code><a href="#area">area</a></code> , <code>form</code> , <code><a href="#img">img</a></code> , or <code><a href="#object">object</a></code> element with a <code title="attr-name">name</code> attribute equal to <var title= "">key</var> , or,</li> <li>It is an <a href="#html-elements" title="HTML elements">HTML element</a> of any kind with an <code title="attr-id"><a href= "#id">id</a></code> attribute equal to <var title="">key</var> . (Non-HTML elements, even if they have IDs, are not searched for the purposes of <code title="dom-HTMLCollection-namedItem"><a href= "#nameditem">namedItem()</a></code> .)</li> </ul> If no such elements are found, then the method must return null. <del class="diff-old">In ECMAScript implementations, objects that implement the HTMLCollection interface must also have a [[Get]] method that, when invoked with a property name that is a number, acts like the item() method would when invoked with that argument, and when invoked with a property name that is a string, acts like the namedItem() method would when invoked with that argument.</del> <h5 id="htmlformcontrolscollection">2.3.1.2. HTMLFormControlsCollection</h5> The <code><a href= "#htmlformcontrolscollection0">HTMLFormControlsCollection</a></code> interface represents a <a href="#collections0" title= "collections">collection</a> of form controls. <pre class="idl"> interface <dfn id= "htmlformcontrolscollection0">HTMLFormControlsCollection</dfn> { readonly attribute unsigned long <a href="#length0" title= "dom-HTMLFormControlsCollection-length">length</a>; <del class="diff-old"> (in unsigned long index); Object (in DOMString name); </del> <ins class="diff-chg"> [IndexGetter] <a href= "#htmlelement">HTMLElement</a> <a href="#itemindex0" title= "dom-HTMLFormControlsCollection-item">item</a>(in unsigned long index); [NameGetter] Object <a href="#nameditem0" title= "dom-HTMLFormControlsCollection-namedItem">namedItem</a>(in DOMString name); </ins> }; </pre> The <dfn id="length0" title= "dom-HTMLFormControlsCollection-length"><code>length</code></dfn> attribute must return the number of nodes <a href= "#represents">represented by the collection <del class= "diff-old">.</del></a> . The <dfn id="itemindex0" title= "dom-HTMLFormControlsCollection-item"><code>item( <var title= "">index</var> )</code></dfn> method must return the <var title= "">index</var> th node in the collection. If there is no <var title="">index</var> th node in the collection, then the method must return null. The <dfn id="nameditem0" title= "dom-HTMLFormControlsCollection-namedItem"><code>namedItem( <var title="">key</var> )</code></dfn> method must act according to the following algorithm: <ol> <li>If, at the time the method is called, there is exactly one node in the collection that has either an <code title="attr-id"><a href= "#id">id</a></code> attribute or a <code title= "attr-name">name</code> attribute equal to <var title="">key</var> , then return that node and stop the algorithm.</li> <li>Otherwise, if there are no nodes in the collection that have either an <code title="attr-id"><a href="#id">id</a></code> attribute or a <code title="attr-name">name</code> attribute equal to <var title="">key</var> , then return null and stop the algorithm.</li> <li>Otherwise, create a <code>NodeList</code> object representing a live view of the <code><a href= "#htmlformcontrolscollection0">HTMLFormControlsCollection</a></code> object, further filtered so that the only nodes in the <code>NodeList</code> object are those that have either an <code title="attr-id"><a href="#id">id</a></code> attribute or a <code title="attr-name">name</code> attribute equal to <var title= "">key</var> . The nodes in the <code>NodeList</code> object must be sorted in <a href="#tree-order">tree order</a> .</li> <li>Return that <code>NodeList</code> object.</li> </ol> <del class="diff-old">In the ECMAScript DOM binding, objects implementing the HTMLFormControlsCollection interface must support being dereferenced using the square bracket notation, such that dereferencing with an integer index is equivalent to invoking the item() method with that index, and such that dereferencing with a string index is equivalent to invoking the namedItem() method with that index.</del> <h5 id="htmloptionscollection">2.3.1.3. HTMLOptionsCollection</h5> The <code><a href= "#htmloptionscollection0">HTMLOptionsCollection</a></code> interface represents a list of <code>option</code> elements. <pre class="idl"> interface <dfn id= "htmloptionscollection0">HTMLOptionsCollection</dfn> { attribute unsigned long <a href="#length1" title= "dom-HTMLOptionsCollection-length">length</a>; <del class="diff-old"> HTMLOptionElement (in unsigned long index); Object (in DOMString name); </del> <ins class="diff-chg"> [IndexGetter] HTMLOptionElement <a href= "#itemindex1" title= "dom-HTMLOptionsCollection-item">item</a>(in unsigned long index); [NameGetter] Object <a href="#nameditem1" title= "dom-HTMLOptionsCollection-namedItem">namedItem</a>(in DOMString name); </ins> }; </pre> On getting, the <dfn id="length1" title= "dom-HTMLOptionsCollection-length"><code>length</code></dfn> attribute must return the number of nodes <a href= "#represents">represented by the collection <del class= "diff-old">.</del></a> . On setting, the <del class="diff-old">behaviour</del> <ins class="diff-chg">behavior</ins> depends on whether the new value is equal to, greater than, or less than the number of nodes <a href="#represents">represented by the collection</a> at that time. If the number is the same, then setting the attribute must do nothing. If the new value is greater, then <var title="">n</var> new <code>option</code> elements with no attributes and no child nodes must be appended to the <code>select</code> element on which the <code><a href= "#htmloptionscollection0">HTMLOptionsCollection</a></code> is rooted, where <var title="">n</var> is the difference between the two numbers (new value minus old value). If the new value is lower, then the last <var title="">n</var> nodes in the collection must be removed from their parent nodes, where <var title="">n</var> is the difference between the two numbers (old value minus new value). Setting <code title= "dom-HTMLOptionsCollection-length"><a href= "#length1">length</a></code> never removes or adds any <code>optgroup</code> elements, and never adds new children to existing <code>optgroup</code> elements (though it can remove children from them). The <dfn id="itemindex1" title= "dom-HTMLOptionsCollection-item"><code>item( <var title= "">index</var> )</code></dfn> method must return the <var title= "">index</var> th node in the collection. If there is no <var title="">index</var> th node in the collection, then the method must return null. The <dfn id="nameditem1" title= "dom-HTMLOptionsCollection-namedItem"><code>namedItem( <var title= "">key</var> )</code></dfn> method must act according to the following algorithm: <ol> <li>If, at the time the method is called, there is exactly one node in the collection that has either an <code title="attr-id"><a href= "#id">id</a></code> attribute or a <code title= "attr-name">name</code> attribute equal to <var title="">key</var> , then return that node and stop the algorithm.</li> <li>Otherwise, if there are no nodes in the collection that have either an <code title="attr-id"><a href="#id">id</a></code> attribute or a <code title="attr-name">name</code> attribute equal to <var title="">key</var> , then return null and stop the algorithm.</li> <li>Otherwise, create a <code>NodeList</code> object representing a live view of the <code><a href= "#htmloptionscollection0">HTMLOptionsCollection</a></code> object, further filtered so that the only nodes in the <code>NodeList</code> object are those that have either an <code title="attr-id"><a href="#id">id</a></code> attribute or a <code title="attr-option-name">name</code> attribute equal to <var title="">key</var> . The nodes in the <code>NodeList</code> object must be sorted in <a href="#tree-order">tree order</a> .</li> <li>Return that <code>NodeList</code> object.</li> </ol> <del class="diff-old">In the ECMAScript DOM binding, objects implementing the HTMLOptionsCollection interface must support being dereferenced using the square bracket notation, such that dereferencing with an integer index is equivalent to invoking the item() method with that index, and such that dereferencing with a string index is equivalent to invoking the namedItem() method with that index.</del> We may want to add <code>add()</code> and <code>remove()</code> methods here too because IE implements HTMLSelectElement and HTMLOptionsCollection on the same object, and so people use them almost interchangeably in the wild. <h4 id="domtokenlist"><del class= "diff-old">2.3.2.</del> <ins class="diff-chg">2.3.2</ins> DOMTokenList</h4> The <code><a href="#domtokenlist0">DOMTokenList</a></code> interface represents an interface to an underlying string that consists of an <a href="#unordered">unordered set of unique space-separated tokens</a> . Which string underlies a particular <code><a href= "#domtokenlist0">DOMTokenList</a></code> object is defined when the object is created. It might be a content attribute (e.g. the string that underlies the <code title="dom-classList"><a href= "#classlist">classList</a></code> object is the <code title= "attr-class"><a href="#class">class</a></code> attribute), or it might be an anonymous string (e.g. when a <code><a href= "#domtokenlist0">DOMTokenList</a></code> object is passed to an author-implemented callback in the <code><a href= "#datagrid0">datagrid</a></code> APIs). <del class= "diff-old">{</del> <pre> <ins class="diff-chg"> class=idl>[<a href="#stringify" title= "dom-tokenlist-toString">Stringifies</a>] interface <dfn id= "domtokenlist0">DOMTokenList</dfn> { </ins> readonly attribute unsigned long <a href="#length2" title= "dom-tokenlist-length">length</a>; <del class="diff-old"> DOMString (in unsigned long index); </del> <ins class="diff-chg"> [IndexGetter] DOMString <a href= "#itemindex2" title= "dom-tokenlist-item">item</a>(in unsigned long index); </ins> boolean <a href="#hastoken" title= "dom-tokenlist-has">has</a>(in DOMString token); void <a href="#addtoken" title= "dom-tokenlist-add">add</a>(in DOMString token); void <a href="#remove" title= "dom-tokenlist-remove">remove</a>(in DOMString token); boolean <a href="#toggle" title= "dom-tokenlist-toggle">toggle</a>(in DOMString token); }; </pre> The <dfn id="length2" title= "dom-tokenlist-length"><code>length</code></dfn> attribute must return the number of unique tokens that result from <a href="#split" title="split a string on spaces">splitting the underlying string on spaces</a> . The <dfn id="itemindex2" title="dom-tokenlist-item"><code>item( <var title="">index</var> )</code></dfn> method must <a href= "#split" title="split a string on spaces">split the underlying string on spaces</a> , sort the resulting list of tokens by Unicode codepoint , remove exact duplicates, and then return the <var title="">index</var> th item in this list. If <var title= "">index</var> is equal to or greater than the number of tokens, then the method must return null. <del class="diff-old">In ECMAScript implementations, objects that implement the DOMTokenList interface must also have a [[Get]] method that, when invoked with a property name that is a number, acts like the item() method would when invoked with that argument.</del> The <dfn id="hastoken" title= "dom-tokenlist-has"><code>has( <var title="">token</var> )</code></dfn> method must run the following algorithm: <ol> <li>If the <var title="">token</var> argument contains any spaces, then raise an <code>INVALID_CHARACTER_ERR</code> exception and stop the algorithm.</li> <li>Otherwise, <a href="#split" title= "split a string on spaces">split the underlying string on spaces</a> to get the list of tokens in the object's underlying string.</li> <li>If the token indicated by <var title="">token</var> is one of the tokens in the object's underlying string then return true and stop this algorithm.</li> <li>Otherwise, return false.</li> </ol> The <dfn id="addtoken" title="dom-tokenlist-add"><code>add( <var title="">token</var> )</code></dfn> method must run the following algorithm: <ol> <li>If the <var title="">token</var> argument contains any spaces, then raise an <code>INVALID_CHARACTER_ERR</code> exception and stop the algorithm.</li> <li>Otherwise, <a href="#split" title= "split a string on spaces">split the underlying string on spaces</a> to get the list of tokens in the object's underlying string.</li> <li>If the given <var title="">token</var> is already one of the tokens in the <code><a href= "#domtokenlist0">DOMTokenList</a></code> object's underlying string then stop the algorithm.</li> <li>Otherwise, if the <del class="diff-old">last character of the</del> <code><a href="#domtokenlist0">DOMTokenList</a></code> object's underlying string is not <ins class="diff-new">the empty string and the last character of that string is not</ins> a <a href="#space">space character</a> , then append a U+0020 SPACE character to the end of that string.</li> <li>Append the value of <var title="">token</var> to the end of the <code><a href="#domtokenlist0">DOMTokenList</a></code> object's underlying string.</li> </ol> The <dfn id="remove" title="dom-tokenlist-remove"><code>remove( <var title="">token</var> )</code></dfn> method must run the following algorithm: <ol> <li>If the <var title="">token</var> argument contains any <a href= "#space" title="space character">spaces</a> , then raise an <code>INVALID_CHARACTER_ERR</code> exception and stop the algorithm.</li> <li>Otherwise, <a href="#remove0" title= "remove a token from a string">remove the given <var title= "">token</var> from the underlying string</a> .</li> </ol> The <dfn id="toggle" title="dom-tokenlist-toggle"><code>toggle( <var title="">token</var> )</code></dfn> method must run the following algorithm: <ol> <li>If the <var title="">token</var> argument contains any spaces, then raise an <code>INVALID_CHARACTER_ERR</code> exception and stop the algorithm.</li> <li>Otherwise, <a href="#split" title= "split a string on spaces">split the underlying string on spaces</a> to get the list of tokens in the object's underlying string.</li> <li>If the given <var title="">token</var> is already one of the tokens in the <code><a href= "#domtokenlist0">DOMTokenList</a></code> object's underlying string then <a href="#remove0" title="remove a token from a string">remove the given <var title="">token</var> from the underlying string</a> , and stop the algorithm, returning false.</li> <li>Otherwise, if the <del class="diff-old">last character of the</del> <code><a href="#domtokenlist0">DOMTokenList</a></code> object's underlying string is not <ins class="diff-new">the empty string and the last character of that string is not</ins> a <a href="#space">space character</a> , then append a U+0020 SPACE character to the end of that string.</li> <li>Append the value of <var title="">token</var> to the end of the <code><a href="#domtokenlist0">DOMTokenList</a></code> object's underlying string.</li> <li>Return true.</li> </ol> <del class="diff-old">In the ECMAScript DOM binding, objects</del> <ins class="diff-chg">Objects</ins> implementing the <code><a href="#domtokenlist0">DOMTokenList</a></code> interface must <dfn id="stringify" title= "dom-tokenlist-toString">stringify</dfn> to the object's underlying string representation. <h4 id="domstringmap"><ins class= "diff-new">2.3.3</ins> <ins class= "diff-new">DOMStringMap</ins></h4> <ins class="diff-new">The</ins> <code><a href= "#domstringmap0"><ins class= "diff-new">DOMStringMap</ins></a></code> <ins class= "diff-new">interface represents a set of name-value pairs. When a</ins> <code><a href="#domstringmap0"><ins class= "diff-new">DOMStringMap</ins></a></code> <ins class= "diff-new">object is instanced, it is associated with three algorithms, one for getting values from names, one for setting names to certain values, and one for deleting names.</ins> <ins class="diff-new">The names of the methods on this interface are temporary and will be fixed when the Web IDL / "Language Bindings for DOM Specifications" spec is ready to handle this case.</ins> <pre class="idl"> interface <dfn id="domstringmap0">DOMStringMap</dfn> {<ins class= "diff-new"> [NameGetter] DOMString <a href="#xxx1name" title= "dom-stringmap-XXX1">XXX1</a>(in DOMString name); [NameSetter] void <a href="#xxx2name" title= "dom-stringmap-XXX2">XXX2</a>(in DOMString name, in DOMString value); [XXX] boolean <a href="#xxx3name" title= "dom-stringmap-XXX3">XXX3</a>(in DOMString name); }; </ins> </pre> <ins class="diff-new">The</ins> <dfn id="xxx1name" title= "dom-stringmap-XXX1"><code><ins class="diff-new">XXX1(</ins> <var title=""><ins class="diff-new">name</ins></var> <ins class= "diff-new">)</ins></code></dfn> <ins class="diff-new">method must call the algorithm for getting values from names, passing</ins> <var title=""><ins class="diff-new">name</ins></var> <ins class= "diff-new">as the name, and must return the corresponding value, or null if</ins> <var title=""><ins class="diff-new">name</ins></var> <ins class="diff-new">has no corresponding value.</ins> <ins class="diff-new">The</ins> <dfn id="xxx2name" title= "dom-stringmap-XXX2"><code><ins class="diff-new">XXX2(</ins> <var title=""><ins class="diff-new">name</ins></var> ,<var title= ""><ins class="diff-new">value</ins></var> <ins class= "diff-new">)</ins></code></dfn> <ins class="diff-new">method must call the algorithm for setting names to certain values, passing</ins> <var title=""><ins class="diff-new">name</ins></var> <ins class="diff-new">as the name and</ins> <var title= ""><ins class="diff-new">value</ins></var> <ins class="diff-new">as the value.</ins> <ins class="diff-new">The</ins> <dfn id="xxx3name" title= "dom-stringmap-XXX3"><code><ins class="diff-new">XXX3(</ins> <var title=""><ins class="diff-new">name</ins></var> <ins class= "diff-new">)</ins></code></dfn> <ins class="diff-new">method must call the algorithm for deleting names, passing</ins> <var title= ""><ins class="diff-new">name</ins></var> <ins class="diff-new">as the name, and must return true.</ins> <h4 id="dom-feature"><del class= "diff-old">2.3.3.</del> <ins class="diff-chg">2.3.4</ins> DOM feature strings</h4> DOM3 Core defines mechanisms for checking for interface support, and for obtaining implementations of interfaces, using <a href= "http://www.w3.org/TR/DOM-Level-3-Core/core.html#DOMFeatures">feature strings</a> . <a href="#references">[DOM3CORE]</a> A DOM application can use the <dfn id="hasfeature" title= "hasFeature"><code>hasFeature( <var title="">feature</var> , <var title="">version</var> )</code></dfn> method of the <code>DOMImplementation</code> interface with parameter values " <code title="">HTML</code> " and " <code>5.0</code> " (respectively) to determine whether or not this module is supported by the implementation. In addition to the feature string " <code title="">HTML</code> ", the feature string " <code title= "">XHTML</code> " (with version string " <code>5.0</code> ") can be used to check if the implementation supports XHTML. User agents should respond with a true value when the <code><a href= "#hasfeature">hasFeature</a></code> method is queried with these values. Authors are cautioned, however, that UAs returning true might not be perfectly compliant, and that UAs returning false might well have support for features in this specification; in general, therefore, use of this method is discouraged. The values " <code title="">HTML</code> " and " <code title= "">XHTML</code> " (both with version " <code>5.0</code> ") should also be supported in the context of the <code>getFeature()</code> and <code>isSupported()</code> methods, as defined by DOM3 Core. The interfaces defined in this specification are not always supersets of the interfaces defined in DOM2 HTML; some features that were formerly deprecated, poorly supported, rarely used or considered unnecessary have been removed. Therefore it is not <del class="diff-old">guarenteed</del> <ins class= "diff-chg">guaranteed</ins> that an implementation that supports " <code title="">HTML</code> " " <code>5.0</code> " also supports " <code title="">HTML</code> " " <code>2.0</code> ". <h3 id="dom-tree"><del class= "diff-old">2.4.</del> <ins class="diff-chg">2.4</ins> <dfn id="dom-tree0">DOM tree accessors</dfn></h3> <dfn id="the-html0">The <code>html</code> element</dfn> of a document is the document's root element, if there is one and it's an <code><a href="#html">html</a></code> element, or null otherwise. <dfn id="the-head0">The <code>head</code> element</dfn> of a document is the first <code><a href="#head">head</a></code> element that is a child of <a href="#the-html0">the <code>html</code> element</a> , if there is one, or null otherwise. <dfn id="the-title1">The <code>title</code> element</dfn> of a document is the first <code><a href="#title1">title</a></code> element <del class="diff-old">that is a child of</del> <ins class= "diff-chg">in</ins> the <del class="diff-old">head element ,</del> <ins class="diff-chg">document (in tree order),</ins> if there is one, or null otherwise. The <dfn id="document.title" title= "dom-document-title"><code>title</code></dfn> attribute must, on getting, run the following algorithm: <ol> <li> If the <a href="#root-element">root element</a> is an <code>svg</code> element in the " <code title= "">http://www.w3.org/2000/svg</code> " namespace, and the user agent supports SVG, then the getter must return the value that would have been returned by the DOM attribute of the same name on the <code>SVGDocument</code> interface. </li> <li> Otherwise, it must return a concatenation of the data of all the child <a href="#text-node" title="text node">text nodes</a> of <a href="#the-title1">the <code>title</code> element</a> , in tree order, or the empty string if <a href="#the-title1">the <code>title</code> element</a> is null. </li> </ol> On setting, the following algorithm must be run: <ol> <li> If the <a href="#root-element">root element</a> is an <code>svg</code> element in the " <code title= "">http://www.w3.org/2000/svg</code> " namespace, and the user agent supports SVG, then the setter must defer to the setter for the DOM attribute of the same name on the <code>SVGDocument</code> interface. Stop the algorithm here. </li> <li>If <a href="#the-title1"><ins class="diff-new">the</ins> <code><ins class="diff-new">title</ins></code> <ins class= "diff-new">element</ins></a> <ins class="diff-new">is null and</ins> <a href="#the-head0">the <code>head</code> element</a> is null, then the attribute must do nothing. Stop the algorithm here.</li> <li>If <a href="#the-title1">the <code>title</code> element</a> is null, then a new <code><a href="#title1">title</a></code> element must be created and appended to <a href="#the-head0">the <code>head</code> element</a> .</li> <li>The children of <a href="#the-title1">the <code>title</code> element</a> (if any) must all be removed.</li> <li>A single <code>Text</code> node whose data is the new value being assigned must be appended to <a href="#the-title1">the <code>title</code> element</a> .</li> </ol> The <code title="dom-document-title"><a href= "#document.title">title</a></code> attribute on the <code><a href= "#htmldocument">HTMLDocument</a></code> interface should shadow the attribute of the same name on the <code>SVGDocument</code> interface when the user agent supports both HTML and SVG. <dfn id="the-body1">The body element</dfn> of a document is the first child of <a href="#the-html0">the <code>html</code> element</a> that is either a <code><a href="#body0">body</a></code> element or a <code>frameset</code> element. If there is no such element, it is null. If the body element is null, then when the specification requires that events be fired at "the body element", they must instead be fired at the <code>Document</code> object. The <dfn id="body" title= "dom-document-body"><code>body</code></dfn> attribute, on getting, must return <a href="#the-body1">the body element</a> of the document (either a <code><a href="#body0">body</a></code> element, a <code>frameset</code> element, or null). On setting, the following algorithm must be run: <ol> <li>If the new value is not a <code><a href= "#body0">body</a></code> or <code>frameset</code> element, then raise a <code>HIERARCHY_REQUEST_ERR</code> exception and abort these steps.</li> <li>Otherwise, if the new value is the same as <a href= "#the-body1">the body element</a> , do nothing. Abort these steps.</li> <li>Otherwise, if <a href="#the-body1">the body element</a> is not null, then replace that element with the new value in the DOM, as if the root element's <code title="">replaceChild()</code> method had been called with the new value and <a href="#the-body1" title= "the body element">the incumbent body element</a> as its two arguments respectively, then abort these steps.</li> <li>Otherwise, the <a href="#the-body1">the body element</a> is null. Append the new value to the root element.</li> </ol> The <dfn id="images0" title= "dom-document-images"><code>images</code></dfn> attribute must return an <code><a href= "#htmlcollection0">HTMLCollection</a></code> rooted at the <code>Document</code> node, whose filter matches only <code><a href="#img">img</a></code> elements. The <dfn id="embeds" title= "dom-document-embeds"><code><ins class= "diff-new">embeds</ins></code></dfn> <ins class= "diff-new">attribute must return an</ins> <code><a href= "#htmlcollection0"><ins class= "diff-new">HTMLCollection</ins></a></code> <ins class= "diff-new">rooted at the</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">node, whose filter matches only</ins> <code><a href="#embed"><ins class= "diff-new">embed</ins></a></code> <ins class= "diff-new">elements.</ins> <ins class="diff-new">The</ins> <dfn id="plugins" title= "dom-document-plugins"><code><ins class= "diff-new">plugins</ins></code></dfn> <ins class= "diff-new">attribute must return the same object as that returned by the</ins> <code title="dom-document-embeds"><a href= "#embeds"><ins class="diff-new">embeds</ins></a></code> <ins class= "diff-new">attribute.</ins> <ins class="diff-new">The</ins> <dfn id="links0" title= "dom-document-links"><code>links</code></dfn> attribute must return an <code><a href="#htmlcollection0">HTMLCollection</a></code> rooted at the <code>Document</code> node, whose filter matches only <code><a href="#a">a</a></code> elements with <code title= "attr-hyperlink-href"><a href="#href6">href</a></code> attributes and <code><a href="#area">area</a></code> elements with <code title="attr-hyperlink-href"><a href="#href6">href</a></code> attributes. The <dfn id="forms0" title= "dom-document-forms"><code>forms</code></dfn> attribute must return an <code><a href="#htmlcollection0">HTMLCollection</a></code> rooted at the <code>Document</code> node, whose filter matches only <code>form</code> elements. The <dfn id="anchors" title= "dom-document-anchors"><code>anchors</code></dfn> attribute must return an <code><a href= "#htmlcollection0">HTMLCollection</a></code> rooted at the <code>Document</code> node, whose filter matches only <code><a href="#a">a</a></code> elements with <code title= "attr-a-name">name</code> attributes. The <dfn id="scripts" title= "dom-document-scripts"><code><ins class= "diff-new">scripts</ins></code></dfn> <ins class= "diff-new">attribute must return an</ins> <code><a href= "#htmlcollection0"><ins class= "diff-new">HTMLCollection</ins></a></code> <ins class= "diff-new">rooted at the</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">node, whose filter matches only</ins> <code><a href="#script1"><ins class= "diff-new">script</ins></a></code> <ins class= "diff-new">elements.</ins> <ins class="diff-new">The</ins> <dfn id="getelementsbyname" title="dom-document-getElementsByName"><code>getElementsByName( <var title="">name</var> )</code></dfn> method a string <var title= "">name</var> , and must return a live <code>NodeList</code> containing all the <code><a href="#a">a</a></code> , <code><a href= "#applet">applet</a></code> , <code>button</code> , <code>form</code> , <code><a href="#iframe">iframe</a></code> , <code><a href="#img">img</a></code> , <code>input</code> , <code><a href="#map">map</a></code> , <code><a href= "#meta0">meta</a></code> , <code><a href= "#object">object</a></code> , <code>select</code> , and <code>textarea</code> elements in that document that have a <code title="">name</code> attribute whose value is equal to the <var title="">name</var> argument. The <dfn id="getelementsbyclassname" title= "dom-document-getElementsByClassName"><code>getElementsByClassName( <var title="">classNames</var> )</code></dfn> method takes a string that contains an <a href="#unordered">unordered set of unique space-separated tokens</a> representing classes. When called, the method must return a live <code>NodeList</code> object containing all the elements in the document that have all the classes specified in that argument, having obtained the classes by <a href= "#split" title="split a string on spaces">splitting a string on spaces</a> . If there are no tokens specified in the argument, then the method must return an empty <code>NodeList</code> . The <dfn id="getelementsbyclassname0" title= "dom-getElementsByClassName"><code>getElementsByClassName()</code></dfn> method on the <code><a href="#htmlelement">HTMLElement</a></code> interface must return a live <code>NodeList</code> with the nodes that the <code><a href="#htmldocument">HTMLDocument</a></code> <code title="dom-document-getElementsByClassName"><a href= "#getelementsbyclassname">getElementsByClassName()</a></code> method would return when passed the same argument(s), excluding any elements that are not descendants of the <code><a href= "#htmlelement">HTMLElement</a></code> object on which the method was invoked. HTML, SVG, and MathML elements define which classes they are in by having an attribute in the per-element partition with the name <code title="">class</code> containing a space-separated list of classes to which the element belongs. Other specifications may also allow elements in their namespaces to be <del class= "diff-old">labelled</del> <ins class="diff-chg">labeled</ins> as being in specific classes. UAs must not assume that all attributes of the name <code title="">class</code> for elements in any namespace work in this way, however, and must not assume that such attributes, when used as global attributes, label other elements as being in specific classes. <div class="example"> Given the following XHTML fragment: <pre> <div id="example"> <p id="p1" class="aaa bbb"/> <p id="p2" class="aaa ccc"/> <p id="p3" class="bbb ccc"/> </div> </pre> A call to <code>document.getElementById('example').getElementsByClassName('aaa')</code> would return a <code>NodeList</code> with the two paragraphs <code>p1</code> and <code>p2</code> in it. A call to <code>getElementsByClassName('ccc bbb')</code> would only return one node, however, namely <code>p3</code> . A call to <code>document.getElementById('example').getElementsByClassName('bbb  ccc ')</code> would return the same thing. A call to <code>getElementsByClassName('aaa,bbb')</code> would return no nodes; none of the elements above are in the "aaa,bbb" class. </div> The <code title="dom-document-dir"><a href= "#dir1">dir</a></code> attribute on the <code><a href= "#htmldocument">HTMLDocument</a></code> interface is defined along with the <code title="attr-dir"><a href="#dir">dir</a></code> content attribute. <h3 id="dynamic"><del class= "diff-old">2.5.</del> <ins class="diff-chg">2.5</ins> <dfn id="dynamic2">Dynamic markup insertion</dfn></h3> The <code title="dom-document-write"><a href= "#document.write">document.write()</a></code> family of methods and the <code title="dom-innerHTML"><a href= "#innerhtml">innerHTML</a></code> family of DOM attributes enable script authors to dynamically insert markup into the document. bz argues that innerHTML should be called something else on XML documents and XML elements. Is the sanity worth the migration pain? Because these APIs interact with the parser, their <del class= "diff-old">behaviour</del> <ins class="diff-chg">behavior</ins> varies depending on whether they are used with <a href= "#html-">HTML documents</a> (and the <a href="#html-0">HTML parser</a> ) or XHTML in <a href="#xml-documents">XML documents</a> (and the XML parser ). The following table cross-references the various versions of these APIs. <table> <thead> <tr> <td></td> <th><dfn id="document.write" title= "dom-document-write"><code>document.write()</code></dfn></th> <th><dfn id="innerhtml" title= "dom-innerHTML"><code>innerHTML</code></dfn></th> </tr> </thead> <tbody> <tr> <th>For documents that are <a href="#html-">HTML documents</a></th> <td><a href="#document.write..." title= "dom-document-write-HTML"><code>document.write()</code> in HTML</a></td> <td><a href="#innerhtml0" title= "dom-innerHTML-HTML"><code>innerHTML</code> in HTML</a></td> </tr> <tr> <th>For documents that are <a href="#xml-documents">XML documents</a></th> <td><a href="#document.write0" title= "dom-document-write-XML"><code>document.write()</code> in XML</a></td> <td><a href="#innerhtml1" title= "dom-innerHTML-XML"><code>innerHTML</code> in XML</a></td> </tr> </tbody> </table> Regardless of the parsing mode, the <dfn id= "document.writeln..." title= "dom-document-writeln"><code>document.writeln(...)</code></dfn> method must call the <code title="dom-document-write"><a href= "#document.write">document.write()</a></code> method with the same argument(s), and then call the <code title= "dom-document-write"><a href= "#document.write">document.write()</a></code> method with, as its argument, a string consisting of a single line feed character (U+000A). <h4 id="controlling"><del class= "diff-old">2.5.1.</del> <ins class="diff-chg">2.5.1</ins> Controlling the input stream</h4> The <dfn id="open" title= "dom-document-open"><code>open()</code></dfn> method comes in several variants with different numbers of arguments. When called with two or fewer arguments, the method must act as follows: <ol> <li> Let <var title="">type</var> be the value of the first argument, if there is one, or " <code>text/html</code> " otherwise. </li> <li> Let <var title="">replace</var> be true if there is a second argument and it has the value "replace" , and false otherwise. </li> <li> If the document has an active parser that isn't a <a href="#script-created">script-created parser</a> , and the <a href="#insertion">insertion point</a> associated with that parser's <a href="#input0">input stream</a> is not undefined (that is, it does point to somewhere in the input stream), then the method does nothing. Abort these steps and return the <code>Document</code> object on which the method was invoked. This basically causes <code title= "dom-document-open"><a href="#open">document.open()</a></code> to be ignored when it's called in an inline script found during the parsing of data sent over the network, while still letting it have an effect when called asynchronously or on a document that is itself being spoon-fed using these APIs. </li> <li> onbeforeunload, <del class= "diff-old">onunload</del> <ins class="diff-chg">onunload, reset timers, empty event queue, kill any pending transactions, XMLHttpRequests, etc</ins> </li> <li> If the document has an active parser , then stop that parser, and throw away any pending content in the input stream. what about if it doesn't, because it's either like a text/plain, or Atom, or PDF, or XHTML, or image document, or something? </li> <li> Remove all child nodes of the document. </li> <li> <ins class="diff-new">Change the</ins> <a href= "#character1"><ins class="diff-new">document's character encoding</ins></a> <ins class="diff-new">to UTF-16.</ins> </li> <li> Create a new <a href="#html-0">HTML parser</a> and associate it with the document. This is a <dfn id= "script-created">script-created parser</dfn> (meaning that it can be closed by the <code title="dom-document-open"><a href= "#open">document.open()</a></code> and <code title= "dom-document-close"><a href="#close">document.close()</a></code> methods, and that the tokeniser will wait for an explicit call to <code title="dom-document-close"><a href= "#close">document.close()</a></code> before emitting an end-of-file token). </li> <li>Mark the document as being an <a href="#html-" title= "HTML documents">HTML document</a> (it might already be so-marked).</li> <li> If <var title="">type</var> does not have the value " <code>text/html</code> " , then act as if the tokeniser had emitted a <code><a href="#pre">pre</a></code> element start tag, then set the <a href="#html-0">HTML parser</a> 's <a href= "#tokenisation0">tokenisation</a> stage's <a href= "#content2">content model flag</a> to PLAINTEXT . </li> <li> If <var title="">replace</var> is false, then: <ol> <li>Remove all the entries in the <a href="#browsing1">browsing context</a> 's <a href="#session">session history</a> after the <a href="#current1">current entry</a> in its <code>Document</code> 's <code><a href="#history2">History</a></code> object</li> <li>Remove any earlier entries that share the same <code>Document</code></li> <li>Add a new entry just before the last entry that is associated with the text that was parsed by the previous parser associated with the <code>Document</code> object, as well as the state of the document at the start of these steps. (This allows the user to step backwards in the session history to see the page before it was blown away by the <code title="dom-document-open"><a href= "#open">document.open()</a></code> call.)</li> </ol> </li> <li> Finally, set the <a href="#insertion">insertion point</a> to point at just before the end of the <a href="#input0">input stream</a> (which at this point will be empty). </li> <li> Return the <code>Document</code> on which the method was invoked. </li> </ol> We shouldn't hard-code <code>text/plain</code> there. We should do it some other way, e.g. hand off to the section on content-sniffing and handling of incoming data streams, the part that defines how this all works when stuff comes over the network. When called with three or more arguments, the <code title= "dom-document-open"><a href="#open">open()</a></code> method on the <code><a href="#htmldocument">HTMLDocument</a></code> object must call the <code title="dom-open"><a href="#open2">open()</a></code> method on the <code><a href="#window">Window</a></code> interface of the object returned by the <code title= "dom-document-defaultView">defaultView</code> attribute of the <code>DocumentView</code> interface of the <code><a href= "#htmldocument">HTMLDocument</a></code> object, with the same arguments as the original call to the <code title= "dom-document-open"><a href="#open">open()</a></code> method, and return whatever that method returned. If the <code title= "dom-document-defaultView">defaultView</code> attribute of the <code>DocumentView</code> interface of the <code><a href= "#htmldocument">HTMLDocument</a></code> object is null, then the method must raise an <code>INVALID_ACCESS_ERR</code> exception. The <dfn id="close" title= "dom-document-close"><code>close()</code></dfn> method must do nothing if there is no <a href="#script-created">script-created parser</a> associated with the document. If there is such a parser, then, when the method is called, the user agent must insert an <a href="#explicit0">explicit "EOF" character</a> at the <a href= "#insertion">insertion point</a> of the parser's <a href= "#input0">input stream</a> . <h4 id="dynamic0"><del class= "diff-old">2.5.2.</del> <ins class="diff-chg">2.5.2</ins> Dynamic markup insertion in HTML</h4> In HTML, the <dfn id="document.write..." title= "dom-document-write-HTML"><code>document.write(...)</code></dfn> method must act as follows: <ol> <li> If the <a href="#insertion">insertion point</a> is undefined, the <code title="dom-document-open"><a href= "#open">open()</a></code> method must be called (with no arguments) on the <code title="Document">document</code> object. The <a href= "#insertion">insertion point</a> will point at just before the end of the (empty) <a href="#input0">input stream</a> . </li> <li> The string consisting of the concatenation of all the arguments to the method must be inserted into the <a href="#input0">input stream</a> just before the <a href="#insertion">insertion point</a> . </li> <li> If there is <a href="#the-script" title= "the script that will execute as soon as the parser resumes">a script that will execute as soon as the parser resumes</a> , then the method must now return without further processing of the <a href="#input0">input stream</a> . </li> <li> Otherwise, the tokeniser must process the characters that were inserted, one at a time, processing resulting tokens as they are emitted, and stopping when the tokeniser reaches the insertion point or when the processing of the tokeniser is aborted by the tree construction stage (this can happen if a <code><a href= "#script1">script</a></code> start tag token is emitted by the tokeniser). If the <code title= "dom-document-write-HTML"><a href= "#document.write...">document.write()</a></code> method was called from script executing inline (i.e. executing because the parser parsed a set of <code><a href="#script1">script</a></code> tags), then this is a <a href="#nestedParsing">reentrant invocation of the parser</a> . </li> <li> Finally, the method must return. </li> </ol> In HTML, the <dfn id="innerhtml0" title= "dom-innerHTML-HTML"><code>innerHTML</code></dfn> DOM attribute of all <code><a href="#htmlelement">HTMLElement</a></code> and <code><a href="#htmldocument">HTMLDocument</a></code> nodes returns a <del class="diff-old">serialisation</del> <ins class= "diff-chg">serialization</ins> of the node's children using the HTML syntax . On setting, it replaces the node's children with new nodes that result from parsing the given value. The formal definitions follow. On getting, the <code title="dom-innerHTML-HTML"><a href= "#innerhtml0">innerHTML</a></code> DOM attribute must return the result of running the <a href="#html-fragment">HTML fragment <del class="diff-old">serialisation</del> <ins class= "diff-chg">serialization</ins> algorithm</a> on the node. On setting, if the node is a document, the <code title= "dom-innerHTML-HTML"><a href="#innerhtml0">innerHTML</a></code> DOM attribute must run the following algorithm: <ol> <li> If the document has an active parser , then stop that parser, and throw away any pending content in the input stream. what about if it doesn't, because it's either like a text/plain, or Atom, or PDF, or XHTML, or image document, or something? </li> <li> Remove the children nodes of the <code>Document</code> whose <code title="dom-innerHTML-HTML"><a href= "#innerhtml0">innerHTML</a></code> attribute is being set. </li> <li> Create a new <a href="#html-0">HTML parser</a> , in its initial state, and associate it with the <code>Document</code> node. </li> <li> Place into the <a href="#input0">input stream</a> for the <a href="#html-0">HTML parser</a> just created the string being assigned into the <code title="dom-innerHTML-HTML"><a href= "#innerhtml0">innerHTML</a></code> attribute. </li> <li> Start the parser and let it run until it has consumed all the characters just inserted into the input stream. (The <code>Document</code> node will have been populated with elements and a <code title="event-load"><a href="#load0">load</a></code> event will have fired on <a href="#the-body1" title= "the body element">its body element</a> .) </li> </ol> Otherwise, if the node is an element, then setting the <code title="dom-innerHTML-HTML"><a href= "#innerhtml0">innerHTML</a></code> DOM attribute must cause the following algorithm to run instead: <ol> <li> Invoke the <a href="#html-fragment0">HTML fragment parsing algorithm</a> , with the element whose <code title= "dom-innerHTML-HTML"><a href="#innerhtml0">innerHTML</a></code> attribute is being set as the <var title="">context</var> <ins class="diff-new">element,</ins> and the string being assigned into the <code title="dom-innerHTML-HTML"><a href= "#innerhtml0">innerHTML</a></code> attribute as the <var title= "">input</var> . Let <var title="">new children</var> be the result of this algorithm. </li> <li> Remove the children of the element whose <code title= "dom-innerHTML-HTML"><a href="#innerhtml0">innerHTML</a></code> attribute is being set. </li> <li> Let <var title="">target document</var> be the <code title= "">ownerDocument</code> of the <code>Element</code> node whose <code title="dom-innerHTML-HTML"><a href= "#innerhtml0">innerHTML</a></code> attribute is being set. </li> <li> Set the <code title="">ownerDocument</code> of all the nodes in <var title="">new children</var> to the <var title="">target document</var> . </li> <li> Append all the <var title="">new children</var> nodes to the node whose <code title="dom-innerHTML-HTML"><a href= "#innerhtml0">innerHTML</a></code> attribute is being set, preserving their order. </li> </ol> <code><a href="#script1">script</a></code> elements inserted using <code title="dom-innerHTML-HTML"><a href= "#innerhtml0">innerHTML</a></code> do not execute when they are inserted. <h4 id="dynamic1"><del class= "diff-old">2.5.3.</del> <ins class="diff-chg">2.5.3</ins> Dynamic markup insertion in XML</h4> In an XML context, the <dfn id="document.write0" title= "dom-document-write-XML"><code>document.write()</code></dfn> method must raise an <code>INVALID_ACCESS_ERR</code> exception. On the other hand, however, the <dfn id="innerhtml1" title= "dom-innerHTML-XML"><code>innerHTML</code></dfn> attribute is indeed usable in an XML context. In an XML context, the <code title="dom-innerHTML-XML"><a href= "#innerhtml1">innerHTML</a></code> DOM attribute on <code><a href= "#htmlelement">HTMLElement</a></code> s <ins class="diff-new">must return a string in the form of an</ins> <a href= "http://www.w3.org/TR/xml/#wf-entities"><ins class= "diff-new">internal general parsed entity</ins></a> , and <ins class="diff-new">on</ins> <code><a href= "#htmldocument">HTMLDocument</a></code> <del class="diff-old">s, on getting,</del> <ins class="diff-chg">s</ins> must return a string in the form of <del class="diff-old">an internal general parsed</del> <ins class="diff-chg">a</ins> <a href= "http://www.w3.org/TR/xml/#sec-well-formed"><ins class= "diff-chg">document</ins> entity <del class="diff-old">that is XML namespace-well-formed, the</del></a> . <ins class= "diff-chg">The</ins> string <del class="diff-old">being</del> <ins class="diff-chg">returned must be XML namespace-well-formed and must be</ins> an isomorphic <del class= "diff-old">serialisation</del> <ins class= "diff-chg">serialization</ins> of all of that node's child nodes, in document order. User agents may adjust prefixes and namespace declarations in the <del class="diff-old">serialisation</del> <ins class="diff-chg">serialization</ins> (and indeed might be forced to do so in some cases to obtain namespace-well-formed XML). <ins class="diff-new">If any of the elements in the serialization are in no namespace, the default namespace in scope for those elements must be explicitly declared as the empty string.</ins> <a href="#references">[XML]</a> <a href= "#references">[XMLNS]</a> If any of the following cases are found in the DOM being <del class="diff-old">serialised,</del> <ins class= "diff-chg">serialized,</ins> the user agent must raise an <code>INVALID_STATE_ERR</code> exception: <ul> <li>A <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">node with no child element nodes.</ins></li> <li><ins class="diff-new">A</ins> <code>DocumentType</code> node that has an external subset public identifier or an external subset system identifier that contains both a U+0022 QUOTATION MARK ('"') and a U+0027 APOSTROPHE ("'").</li> <li>A node with a prefix or local name containing a U+003A COLON (":").</li> <li><del class="diff-old">A</del> <ins class="diff-chg">An</ins> <code><ins class="diff-chg">Attr</ins></code> <ins class= "diff-chg">node,</ins> <code>Text</code> <ins class= "diff-new">node,</ins> <code><ins class= "diff-new">CDATASection</ins></code> <ins class= "diff-new">node,</ins> <code><ins class= "diff-new">Comment</ins></code> <ins class="diff-new">node, or</ins> <code><ins class= "diff-new">ProcessingInstruction</ins></code> node whose data contains characters that are not matched by the XML <code title= "">Char</code> production. <a href="#references">[XML]</a></li> <li>A <code>CDATASection</code> node whose data contains the string " <code title="">]]></code> ".</li> <li>A <code>Comment</code> node whose data contains two adjacent U+002D HYPHEN-MINUS (-) characters or ends with such a character.</li> <li>A <code>ProcessingInstruction</code> node whose target name is the string " <code title="">xml</code> " (case insensitively) .</li> <li>A <code>ProcessingInstruction</code> node whose target name contains a U+003A COLON (":").</li> <li>A <code>ProcessingInstruction</code> node whose data contains the string " <code title="">?></code> ".</li> </ul> These are the only ways to make a DOM <del class= "diff-old">unserialisable.</del> <ins class= "diff-chg">unserializable.</ins> The DOM enforces all the other XML constraints; for example, trying to set an attribute with a name that contains an equals sign (=) will raised an <code>INVALID_CHARACTER_ERR</code> exception. On setting, in an XML context, the <code title= "dom-innerHTML-XML"><a href="#innerhtml1">innerHTML</a></code> DOM attribute on <code><a href="#htmlelement">HTMLElement</a></code> s and <code><a href="#htmldocument">HTMLDocument</a></code> s must run the following algorithm: <ol> <li> The user agent must create a new XML parser . </li> <li> If the <code title="dom-innerHTML-XML"><a href= "#innerhtml1">innerHTML</a></code> attribute is being set on an element, the user agent must feed the parser just created the string corresponding to the start tag of that element, declaring all the namespace prefixes that are in scope on that element in the DOM, as well as declaring the default namespace (if any) that is in scope on that element in the DOM. </li> <li> The user agent must feed the parser just created the string being assigned into the <code title= "dom-innerHTML-XML"><a href="#innerhtml1">innerHTML</a></code> attribute. </li> <li> If the <code title="dom-innerHTML-XML"><a href= "#innerhtml1">innerHTML</a></code> attribute is being set on an element, the user agent must feed the parser the string corresponding to the end tag of that element. </li> <li> If the parser found a well-formedness error, the attribute's setter must raise a <code>SYNTAX_ERR</code> exception and abort these steps. </li> <li> The user agent must remove the children nodes of the node whose <code title="dom-innerHTML-XML"><a href= "#innerhtml1">innerHTML</a></code> attribute is being set. </li> <li> If the attribute is being set on a <code>Document</code> node, let <var title="">new children</var> be the children of the document, preserving their order. Otherwise, the attribute is being set on an <code>Element</code> node; let <var title="">new children</var> be the children of the <del class= "diff-old">the</del> document's root element, preserving their order. </li> <li> If the attribute is being set on a <code>Document</code> node, let <var title="">target document</var> be that <code>Document</code> node. Otherwise, the attribute is being set on an <code>Element</code> node; let <var title="">target document</var> be the <code title="">ownerDocument</code> of that <code>Element</code> . </li> <li> Set the <code title="">ownerDocument</code> of all the nodes in <var title="">new children</var> to the <var title="">target document</var> . </li> <li> Append all the <var title="">new children</var> nodes to the node whose <code title="dom-innerHTML-XML"><a href= "#innerhtml1">innerHTML</a></code> attribute is being set, preserving their order. </li> </ol> <code><a href="#script1">script</a></code> elements inserted using <code title="dom-innerHTML-XML"><a href= "#innerhtml1">innerHTML</a></code> do not execute when they are inserted. <h3 id="apis-in"><del class= "diff-old">2.6.</del> <ins class="diff-chg">2.6</ins> APIs in HTML documents</h3> For <a href="#html-">HTML documents</a> , and for <a href= "#html-elements">HTML elements</a> in <a href="#html-">HTML documents</a> , certain APIs defined in DOM3 Core become case-insensitive or case-changing, as sometimes defined in DOM3 Core, and as <del class="diff-old">summarised</del> <ins class= "diff-chg">summarized</ins> or required below. <a href= "#references">[DOM3CORE]</a> . This does not apply to <a href="#xml-documents">XML documents</a> or to elements that are not in the <a href= "#html-namespace0">HTML namespace</a> despite being in <a href= "#html-">HTML documents</a> . <dl> <dt><code title="">Element.tagName</code> , <code title= "">Node.nodeName</code> , and <code title= "">Node.localName</code></dt> <dd> These attributes return tag names in all uppercase and attribute names in all lowercase, regardless of the case with which they were created. </dd> <dt><code title="">Document.createElement()</code></dt> <dd> The canonical form of HTML markup is all-lowercase; thus, this method will lowercase the argument before creating the requisite element. Also, the element created must be in the <a href= "#html-namespace0">HTML namespace</a> . This doesn't apply to <code title= "">Document.createElementNS()</code> . Thus, it is possible, by passing this last method a tag name in the wrong case, to create an element that claims to have the tag name of an element defined in this specification, but doesn't support its interfaces, because it really has another tag name not accessible from the DOM APIs. </dd> <dt><code title="">Element.setAttributeNode()</code></dt> <dd> When an <code>Attr</code> node is set on an <a href= "#html-elements" title="HTML elements">HTML element</a> , it must have its name lowercased before the element is affected. This doesn't apply to <code title= "">Document.setAttributeNodeNS()</code> . </dd> <dt><code title="">Element.setAttribute()</code></dt> <dd> When an attribute is set on an <a href="#html-elements" title= "HTML elements">HTML element</a> , the name argument must be lowercased before the element is affected. This doesn't apply to <code title= "">Document.setAttributeNS()</code> . </dd> <dt><code title="">Document.getElementsByTagName()</code> and <code title="">Element.getElementsByTagName()</code></dt> <dd> These methods (but not their namespaced counterparts) must compare the given argument case-insensitively when looking at <a href="#html-elements" title="HTML elements">HTML elements</a> , and case-sensitively otherwise. Thus, in an <a href="#html-" title= "HTML documents">HTML document</a> with nodes in multiple namespaces, these methods will be both case-sensitive and case-insensitive at the same time. </dd> <dt><code title="">Document.renameNode()</code></dt> <dd> If the new namespace is the <a href="#html-namespace0">HTML namespace</a> , then the new qualified name must be lowercased before the rename takes place. </dd> </dl> <h2 id="semantics">3. Semantics and structure of HTML elements</h2> <h3 id="semantics-intro"><del class= "diff-old">3.1.</del> <ins class="diff-chg">3.1</ins> Introduction</h3> This section is non-normative. An introduction to marking up a document. <h3 id="common1"><del class= "diff-old">3.2.</del> <ins class="diff-chg">3.2</ins> Common microsyntaxes</h3> There are various places in HTML that accept particular data types, such as dates or numbers. This section describes what the conformance criteria for content in those formats is, and how to parse them. Need to go through the whole spec and make sure all the attribute values are clearly defined either in terms of microsyntaxes or in terms of other specs, or as "Text" or some such. <h4 id="common2"><del class= "diff-old">3.2.1.</del> <ins class="diff-chg">3.2.1</ins> Common parser idioms</h4> The <dfn id="space" title="space character">space characters</dfn> , for the purposes of this specification, are U+0020 SPACE, U+0009 CHARACTER TABULATION (tab), U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), and U+000D CARRIAGE RETURN (CR). Some of the micro-parsers described below follow the pattern of having an <var title="">input</var> variable that holds the string being parsed, and having a <var title="">position</var> variable pointing at the next character to parse in <var title= "">input</var> . For parsers based on this pattern, a step that requires the user agent to <dfn id="collect">collect a sequence of characters</dfn> means that the following algorithm must be run, with <var title= "">characters</var> being the set of characters that can be collected: <ol> <li> Let <var title="">input</var> and <var title="">position</var> be the same variables as those of the same name in the algorithm that invoked these steps. </li> <li> Let <var title="">result</var> be the empty string. </li> <li> While <var title="">position</var> doesn't point past the end of <var title="">input</var> and the character at <var title= "">position</var> is one of the <var title="">characters</var> , append that character to the end of <var title="">result</var> and advance <var title="">position</var> to the next character in <var title="">input</var> . </li> <li> Return <var title="">result</var> . </li> </ol> The step <dfn id="skip-whitespace">skip whitespace</dfn> means that the user agent must <a href="#collect">collect a sequence of characters</a> that are <a href="#space" title= "space character">space characters</a> . The step <dfn id= "skip-">skip Zs characters</dfn> means that the user agent must <a href="#collect">collect a sequence of characters</a> that are in the Unicode character class Zs. In both cases, the collected characters are not used. <a href="#references">[UNICODE]</a> <h4 id="boolean"><del class= "diff-old">3.2.2.</del> <ins class="diff-chg">3.2.2</ins> Boolean attributes</h4> A number of attributes in HTML5 are <dfn id="boolean0" title= "boolean attribute">boolean attributes</dfn> . The presence of a boolean attribute on an element represents the true value, and the absence of the attribute represents the false value. If the attribute is present, its value must either be the empty string or <ins class="diff-new">a value that is a case-insensitive match for</ins> the attribute's canonical name, <del class= "diff-old">exactly,</del> with no leading or trailing <del class= "diff-old">whitespace, and in lowercase.</del> <ins class= "diff-chg">whitespace.</ins> <h4 id="numbers"><del class= "diff-old">3.2.3.</del> <ins class="diff-chg">3.2.3</ins> Numbers</h4> <h5 id="unsigned">3.2.3.1. Unsigned integers</h5> A string is a <dfn id="valid">valid non-negative integer</dfn> if it consists of one of more characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). The <dfn id="rules">rules for parsing non-negative integers</dfn> are as given in the following algorithm. When invoked, the steps must be followed in the order given, aborting at the first step that returns a value. This algorithm will either return zero, a positive integer, or an error. Leading spaces are ignored. Trailing spaces and indeed any trailing garbage characters are ignored. <ol> <li> Let <var title="">input</var> be the string being parsed. </li> <li> Let <var title="">position</var> be a pointer into <var title= "">input</var> , initially pointing at the start of the string. </li> <li> Let <var title="">value</var> have the value 0. </li> <li> <a href="#skip-whitespace">Skip whitespace.</a> </li> <li> If <var title="">position</var> is past the end of <var title= "">input</var> , return an error. </li> <li> If the next character is not one of U+0030 DIGIT ZERO (0) .. U+0039 DIGIT NINE (9), then return an error. </li> <li> If the next character is one of U+0030 DIGIT ZERO (0) .. U+0039 DIGIT NINE (9): <ol> <li>Multiply <var title="">value</var> by ten.</li> <li>Add the value of the current character (0..9) to <var title= "">value</var> .</li> <li>Advance <var title="">position</var> to the next character.</li> <li>If <var title="">position</var> is not past the end of <var title="">input</var> , return to the top of step 7 in the overall algorithm (that's the step within which these substeps find themselves).</li> </ol> </li> <li> Return <var title="">value</var> . </li> </ol> <h5 id="signed">3.2.3.2. Signed integers</h5> A string is a <dfn id="valid0">valid integer</dfn> if it consists of one of more characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), optionally prefixed with a U+002D HYPHEN-MINUS ("-") character. The <dfn id="rules0">rules for parsing integers</dfn> are similar to the rules for non-negative integers, and are as given in the following algorithm. When invoked, the steps must be followed in the order given, aborting at the first step that returns a value. This algorithm will either return an integer or an error. Leading spaces are ignored. Trailing spaces and trailing garbage characters are ignored. <ol> <li> Let <var title="">input</var> be the string being parsed. </li> <li> Let <var title="">position</var> be a pointer into <var title= "">input</var> , initially pointing at the start of the string. </li> <li> Let <var title="">value</var> have the value 0. </li> <li> Let <var title="">sign</var> have the value "positive". </li> <li> <a href="#skip-whitespace">Skip whitespace.</a> </li> <li> If <var title="">position</var> is past the end of <var title= "">input</var> , return an error. </li> <li> If the character indicated by <var title="">position</var> (the first character) is a U+002D HYPHEN-MINUS ("-") character: <ol> <li>Let <var title="">sign</var> be "negative".</li> <li>Advance <var title="">position</var> to the next character.</li> <li>If <var title="">position</var> is past the end of <var title= "">input</var> , return an error.</li> </ol> </li> <li> If the next character is not one of U+0030 DIGIT ZERO (0) .. U+0039 DIGIT NINE (9), then return an error. </li> <li> If the next character is one of U+0030 DIGIT ZERO (0) .. U+0039 DIGIT NINE (9): <ol> <li>Multiply <var title="">value</var> by ten.</li> <li>Add the value of the current character (0..9) to <var title= "">value</var> .</li> <li>Advance <var title="">position</var> to the next character.</li> <li>If <var title="">position</var> is not past the end of <var title="">input</var> , return to the top of step 9 in the overall algorithm (that's the step within which these substeps find themselves).</li> </ol> </li> <li> If <var title="">sign</var> is "positive", return <var title= "">value</var> , otherwise return 0- <var title="">value</var> . </li> </ol> <h5 id="real-numbers">3.2.3.3. Real numbers</h5> A string is a <dfn id="valid1">valid floating point number</dfn> if it consists of one of more characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), optionally with a single U+002E FULL STOP (".") character somewhere (either before these numbers, in between two numbers, or after the numbers), all optionally prefixed with a U+002D HYPHEN-MINUS ("-") character. The <dfn id="rules1">rules for parsing floating point number values</dfn> are as given in the following algorithm. As with the previous algorithms, when this one is invoked, the steps must be followed in the order given, aborting at the first step that returns a value. This algorithm will either return a number or an error. Leading spaces are ignored. Trailing spaces and garbage characters are ignored. <ol> <li> Let <var title="">input</var> be the string being parsed. </li> <li> Let <var title="">position</var> be a pointer into <var title= "">input</var> , initially pointing at the start of the string. </li> <li> Let <var title="">value</var> have the value 0. </li> <li> Let <var title="">sign</var> have the value "positive". </li> <li> <a href="#skip-whitespace">Skip whitespace.</a> </li> <li> If <var title="">position</var> is past the end of <var title= "">input</var> , return an error. </li> <li> If the character indicated by <var title="">position</var> (the first character) is a U+002D HYPHEN-MINUS ("-") character: <ol> <li>Let <var title="">sign</var> be "negative".</li> <li>Advance <var title="">position</var> to the next character.</li> <li>If <var title="">position</var> is past the end of <var title= "">input</var> , return an error.</li> </ol> </li> <li> If the next character is not one of U+0030 DIGIT ZERO (0) .. U+0039 DIGIT NINE (9) or U+002E FULL STOP ("."), then return an error. </li> <li> If the next character is U+002E FULL STOP ("."), but either that is the last character or the character after that one is not one of U+0030 DIGIT ZERO (0) .. U+0039 DIGIT NINE (9), then return an error. </li> <li> If the next character is one of U+0030 DIGIT ZERO (0) .. U+0039 DIGIT NINE (9): <ol> <li>Multiply <var title="">value</var> by ten.</li> <li>Add the value of the current character (0..9) to <var title= "">value</var> .</li> <li>Advance <var title="">position</var> to the next character.</li> <li>If <var title="">position</var> is past the end of <var title= "">input</var> , then if <var title="">sign</var> is "positive", return <var title="">value</var> , otherwise return 0- <var title= "">value</var> .</li> <li>Otherwise return to the top of step 10 in the overall algorithm (that's the step within which these substeps find themselves).</li> </ol> </li> <li> Otherwise, if the next character is not a U+002E FULL STOP ("."), then if <var title="">sign</var> is "positive", return <var title="">value</var> , otherwise return 0- <var title= "">value</var> . </li> <li> The next character is a U+002E FULL STOP ("."). Advance <var title="">position</var> to the character after that. </li> <li> Let <var title="">divisor</var> be 1. </li> <li> If the next character is one of U+0030 DIGIT ZERO (0) .. U+0039 DIGIT NINE (9): <ol> <li>Multiply <var title="">divisor</var> by ten.</li> <li>Add the value of the current character (0..9) divided by <var title="">divisor</var> , to <var title="">value</var> .</li> <li>Advance <var title="">position</var> to the next character.</li> <li>If <var title="">position</var> is past the end of <var title= "">input</var> , then if <var title="">sign</var> is "positive", return <var title="">value</var> , otherwise return 0- <var title= "">value</var> .</li> <li>Otherwise return to the top of step 14 in the overall algorithm (that's the step within which these substeps find themselves).</li> </ol> </li> <li> Otherwise, if <var title="">sign</var> is "positive", return <var title="">value</var> , otherwise return 0- <var title= "">value</var> . </li> </ol> <h5 id="ratios">3.2.3.4. Ratios</h5> The algorithms described in this section are used by the <code><a href="#progress">progress</a></code> and <code><a href="#meter">meter</a></code> elements. A <dfn id="valid2">valid denominator punctuation character</dfn> is one of the characters from the table below. There is <dfn id= "a-value" title= "values associated with denominator punctuation characters">a value associated with each denominator punctuation character</dfn> , as shown in the table below. <table> <thead> <tr> <th colspan="2">Denominator Punctuation Character</th> <th>Value</th> </tr> </thead> <tbody> <tr> <td>U+0025 PERCENT SIGN</td> <td>%</td> <td>100</td> </tr> <tr> <td>U+066A ARABIC PERCENT SIGN</td> <td>٪</td> <td>100</td> </tr> <tr> <td>U+FE6A SMALL PERCENT SIGN</td> <td>﹪</td> <td>100</td> </tr> <tr> <td>U+FF05 FULLWIDTH PERCENT SIGN</td> <td>％</td> <td>100</td> </tr> <tr> <td>U+2030 PER MILLE SIGN</td> <td>‰</td> <td>1000</td> </tr> <tr> <td>U+2031 PER TEN THOUSAND SIGN</td> <td>‱</td> <td>10000</td> </tr> </tbody> </table> The <dfn id="steps">steps for finding one or two numbers of a ratio in a string</dfn> are as follows: <ol> <li>If the string is empty, then return nothing and abort these steps.</li> <li><a href="#find-a">Find a number</a> in the string according to the algorithm below, starting at the start of the string.</li> <li>If the sub-algorithm in step 2 returned nothing or returned an error condition, return nothing and abort these steps.</li> <li>Set <var title="">number1</var> to the number returned by the sub-algorithm in step 2.</li> <li>Starting with the character immediately after the last one examined by the sub-algorithm in step 2, skip any characters in the string that are in the Unicode character class Zs (this might match zero characters). <a href="#references">[UNICODE]</a></li> <li>If there are still further characters in the string, and the next character in the string is a <a href="#valid2">valid denominator punctuation character</a> , set <var title= "">denominator</var> to that character.</li> <li>If the string contains any other characters in the range U+0030 DIGIT ZERO to U+0039 DIGIT NINE, but <var title= "">denominator</var> was given a value in the step 6, return nothing and abort these steps.</li> <li>Otherwise, if <var title="">denominator</var> was given a value in step 6, return <var title="">number1</var> and <var title= "">denominator</var> and abort these steps.</li> <li><a href="#find-a">Find a number</a> in the string again, starting immediately after the last character that was examined by the sub-algorithm in step 2.</li> <li>If the sub-algorithm in step 9 returned nothing or an error condition, return nothing and abort these steps.</li> <li>Set <var title="">number2</var> to the number returned by the sub-algorithm in step 9.</li> <li>If there are still further characters in the string, and the next character in the string is a <a href="#valid2">valid denominator punctuation character</a> , return nothing and abort these steps.</li> <li>If the string contains any other characters in the range U+0030 DIGIT ZERO to U+0039 DIGIT NINE, return nothing and abort these steps.</li> <li>Otherwise, return <var title="">number1</var> and <var title= "">number2</var> .</li> </ol> The algorithm to <dfn id="find-a">find a number</dfn> is as follows. It is given a string and a starting position, and returns either nothing, a number, or an error condition. <ol> <li>Starting at the given starting position, ignore all characters in the given string until the first character that is either a U+002E FULL STOP or one of the ten characters in the range U+0030 DIGIT ZERO to U+0039 DIGIT NINE.</li> <li>If there are no such characters, return nothing and abort these steps.</li> <li>Starting with the character matched in step 1, collect all the consecutive characters that are either a U+002E FULL STOP or one of the ten characters in the range U+0030 DIGIT ZERO to U+0039 DIGIT NINE, and assign this string of one or more characters to <var title="">string</var> .</li> <li>If <var title="">string</var> contains more than one U+002E FULL STOP character then return an error condition and abort these steps.</li> <li>Parse <var title="">string</var> according to the <a href= "#rules1">rules for parsing floating point number values</a> , to obtain <var title="">number</var> . This step cannot fail ( <var title="">string</var> is <del class= "diff-old">guarenteed</del> <ins class="diff-chg">guaranteed</ins> to be a <a href="#valid1">valid floating point number</a> ).</li> <li>Return <var title="">number</var> .</li> </ol> <h5 id="percentages-and-dimensions">3.2.3.5. Percentages and dimensions</h5> <dfn id="valid3">valid positive non-zero integers</dfn> <dfn id="rules2">rules for parsing dimension values</dfn> (only used by height/width on img, embed, object — lengths in css pixels or percentages) <h5 id="lists">3.2.3.6. Lists of integers</h5> A <dfn id="valid4">valid list of integers</dfn> is a number of <a href="#valid0" title="valid integer">valid integers</a> separated by U+002C COMMA characters, with no other characters (e.g. no <a href="#space" title="space character">space characters</a> ). In addition, there might be restrictions on the number of integers that can be given, or on the range of values allowed. The <dfn id="rules3">rules for parsing a list of integers</dfn> are as follows: <ol> <li> Let <var title="">input</var> be the string being parsed. </li> <li> Let <var title="">position</var> be a pointer into <var title= "">input</var> , initially pointing at the start of the string. </li> <li> Let <var title="">numbers</var> be an initially empty list of integers. This list will be the result of this algorithm. </li> <li> If there is a character in the string <var title="">input</var> at position <var title="">position</var> , and it is either <del class="diff-old">U+002C COMMA character or</del> a U+0020 <del class="diff-old">SPACE</del> <ins class="diff-chg">SPACE, U+002C COMMA, or U+003B SEMICOLON</ins> character, then advance <var title="">position</var> to the next character in <var title= "">input</var> , or to beyond the end of the string if there are no more characters. </li> <li> If <var title="">position</var> points to beyond the end of <var title="">input</var> , return <var title="">numbers</var> and abort. </li> <li> If the character in the string <var title="">input</var> at position <var title="">position</var> is a <ins class= "diff-new">U+0020 SPACE,</ins> U+002C <del class="diff-old">COMMA character</del> <ins class="diff-chg">COMMA,</ins> or <del class= "diff-old">a U+0020 SPACE</del> <ins class="diff-chg">U+003B SEMICOLON</ins> character, <ins class="diff-new">then</ins> return to step 4. </li> <li> Let <var title="">negated</var> be false. </li> <li> Let <var title="">value</var> be 0. </li> <li> Let <var title=""><del class="diff-old">multiple</del> <ins class="diff-chg">started</ins></var> be <del class= "diff-old">1.</del> <ins class="diff-chg">false. This variable is set to true when the parser sees a number or a "</ins> <code title= ""><ins class="diff-chg">-</ins></code> <ins class="diff-chg">" character.</ins> </li> <li> Let <var title=""><del class="diff-old">started</del> <ins class="diff-chg">got number</ins></var> be false. <ins class= "diff-new">This variable is set to true when the parser sees a number.</ins> </li> <li> Let <var title="">finished</var> be false. <ins class= "diff-new">This variable is set to true to switch parser into a mode where it ignores characters until the next separator.</ins> </li> <li> Let <var title="">bogus</var> be false. </li> <li> Parser: If the character in the string <var title= "">input</var> at position <var title="">position</var> is: <dl class="switch"> <dt>A U+002D HYPHEN-MINUS character</dt> <dd> Follow these substeps: <ol> <li>If <var title=""><ins class="diff-new">got number</ins></var> <ins class="diff-new">is true, let</ins> <var title=""><ins class= "diff-new">finished</ins></var> <ins class="diff-new">be true.</ins></li> <li><ins class="diff-new">If</ins> <var title="">finished</var> is true, skip to the next step in the overall set of steps.</li> <li>If <var title="">started</var> is <del class="diff-old">true or if bogus is</del> true, let <var title="">negated</var> be false.</li> <li>Otherwise, if <var title="">started</var> is false and if <var title="">bogus</var> is false, let <var title="">negated</var> be true.</li> <li>Let <var title="">started</var> be true.</li> </ol> </dd> <dt>A character in the range U+0030 DIGIT ZERO .. U+0039 DIGIT NINE</dt> <dd> Follow these substeps: <ol> <li>If <var title="">finished</var> is true, skip to the next step in the overall set of steps.</li> <li><del class="diff-old">Let</del> <ins class= "diff-chg">Multiply</ins> <var title=""><del class= "diff-old">n</del> <ins class="diff-chg">value</ins></var> <del class="diff-old">be</del> <ins class="diff-chg">by ten.</ins></li> <li><ins class="diff-chg">Add</ins> the value of the digit, interpreted in base ten, <del class="diff-old">multiplied by multiple . Add n</del> to <var title="">value</var> .</li> <li><del class="diff-old">If value is greater than zero, multiply</del> <ins class="diff-chg">Let</ins> <var title= ""><del class="diff-old">multiple</del> <ins class= "diff-chg">started</ins></var> <del class="diff-old">by ten.</del> <ins class="diff-chg">be true.</ins></li> <li>Let <var title=""><del class="diff-old">started</del> <ins class="diff-chg">got number</ins></var> be true.</li> </ol> </dd> <dt>A <ins class="diff-new">U+0020 SPACE character</ins></dt> <dt><ins class="diff-new">A</ins> U+002C COMMA character</dt> <dt>A <del class="diff-old">U+0020 SPACE</del> <ins class= "diff-chg">U+003B SEMICOLON</ins> character</dt> <dd> Follow these substeps: <ol> <li>If <var title=""><del class="diff-old">started</del> <ins class="diff-chg">got number</ins></var> is false, return the <var title="">numbers</var> list and abort. <ins class= "diff-new">This happens if an entry in the list has no digits, as in "</ins> <code title=""><ins class= "diff-new">1,2,x,4</ins></code> <ins class="diff-new">".</ins></li> <li>If <var title="">negated</var> is true, then negate <var title= "">value</var> .</li> <li>Append <var title="">value</var> to the <var title= "">numbers</var> list.</li> <li>Jump to step 4 in the overall set of steps.</li> </ol> </dd> <dt>A U+002E FULL STOP character</dt> <dd> Follow these substeps: <ol> <li><del class="diff-old">Let</del> <ins class="diff-chg">If</ins> <var title=""><ins class="diff-chg">got number</ins></var> <ins class="diff-chg">is true, let</ins> <var title= "">finished</var> be true.</li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">finished</ins></var> <ins class="diff-new">is true, skip to the next step in the overall set of steps.</ins></li> <li><ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">negated</ins></var> <ins class="diff-new">be false.</ins></li> </ol> </dd> <dt>Any other character</dt> <dd> Follow these substeps: <ol> <li>If <var title="">finished</var> is true, skip to the next step in the overall set of steps.</li> <li>Let <var title="">negated</var> be false.</li> <li>Let <var title="">bogus</var> be true.</li> <li>If <var title="">started</var> is true, then return the <var title="">numbers</var> list, and abort. (The value in <var title="">value</var> is not appended to the list first; it is dropped.)</li> </ol> </dd> </dl> </li> <li> Advance <var title="">position</var> to the next character in <var title="">input</var> , or to beyond the end of the string if there are no more characters. </li> <li> If <var title="">position</var> points to a character (and not to beyond the end of <var title="">input</var> ), jump to the big Parser step above. </li> <li> If <var title="">negated</var> is true, then negate <var title= "">value</var> . </li> <li> If <var title=""><del class="diff-old">started</del> <ins class= "diff-chg">got number</ins></var> is true, then append <var title= "">value</var> to the <var title="">numbers</var> <del class= "diff-old">list, return that list, and abort.</del> <ins class= "diff-chg">list.</ins> </li> <li> Return the <var title="">numbers</var> list and abort. </li> </ol> <h4 id="dates"><del class= "diff-old">3.2.4.</del> <ins class="diff-chg">3.2.4</ins> Dates and times</h4> In the algorithms below, the <dfn id="number">number of days in month <var title="">month</var> of year <var title= "">year</var></dfn> is: 31 if <var title="">month</var> is 1, 3, 5, 7, 8, 10, or 12; 30 if <var title="">month</var> is 4, 6, 9, or 11; 29 if <var title="">month</var> is 2 and <var title="">year</var> is a number divisible by 400, or if <var title="">year</var> is a number divisible by 4 but not by 100; and 28 otherwise. This takes into account leap years in the Gregorian calendar. <a href="#references">[GREGORIAN]</a> <h5 id="specific">3.2.4.1. Specific moments in time</h5> A string is a <dfn id="valid5">valid datetime</dfn> if it has four digits (representing the year), a literal hyphen, two digits (representing the month), a literal hyphen, two digits (representing the day), optionally some spaces, either a literal T or a space, optionally some more spaces, two digits (for the hour), a colon, two digits (the minutes), optionally the seconds (which, if included, must consist of another colon, two digits (the integer part of the seconds), and optionally a decimal point followed by one or more digits (for the fractional part of the seconds)), optionally some spaces, and finally either a literal Z (indicating the time zone is UTC), or, a plus sign or a minus sign followed by two digits, a colon, and two digits (for the sign, the hours and minutes of the timezone offset respectively); with the month-day combination being a valid date in the given year according to the Gregorian calendar, the hour values ( <var title="">h</var> ) being in the range 0 ≤  <var title="">h</var>  ≤ 23, the minute values ( <var title="">m</var> ) in the range 0 ≤  <var title="">m</var>  ≤ 59, and the second value ( <var title="">s</var> ) being in the range 0 ≤  <var title="">h</var>  < 60. <a href= "#references">[GREGORIAN]</a> The digits must be characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), the hyphens must be a U+002D HYPHEN-MINUS characters, the T must be a U+0054 LATIN CAPITAL LETTER T, the colons must be U+003A COLON characters, the decimal point must be a U+002E FULL STOP, the Z must be a U+005A LATIN CAPITAL LETTER Z, the plus sign must be a U+002B PLUS SIGN, and the minus U+002D (same as the hyphen). <div class="example"> The following are some examples of dates written as <a href= "#valid5" title="valid datetime">valid datetimes</a> . <dl> <dt>" <code>0037-12-13 00:00 Z</code> "</dt> <dd>Midnight UTC on the birthday of Nero (the Roman Emperor).</dd> <dt>" <code>1979-10-14T12:00:00.001-04:00</code> "</dt> <dd>One millisecond after noon on October 14th 1979, in the time zone in use on the east coast of North America during daylight saving time.</dd> <dt>" <code>8592-01-01 T 02:09 +02:09</code> "</dt> <dd>Midnight UTC on the 1st of January, 8592. The time zone associated with that time is two hours and nine minutes ahead of UTC.</dd> </dl> Several things are notable about these dates: <ul> <li>Years with fewer than four digits have to be zero-padded. The date "37-12-13" would not be a valid date.</li> <li>To unambiguously identify a moment in time prior to the introduction of the Gregorian calendar, the date has to be first converted to the Gregorian calendar from the calendar in use at the time (e.g. from the Julian calendar). The date of Nero's birth is the 15th of December 37, in the Julian Calendar, which is the 13th of December 37 in the Gregorian Calendar.</li> <li>The time and timezone components are not optional.</li> <li>Dates before the year 0 or after the year 9999 can't be represented as a datetime in this version of HTML.</li> <li>Time zones differ based on daylight savings time.</li> </ul> </div> Conformance checkers can use the algorithm below to determine if a datetime is a valid datetime or not. To <dfn id="datetime-parser">parse a string as a datetime value</dfn> , a user agent must apply the following algorithm to the string. This will either return a time in UTC, with associated timezone information for round tripping or display purposes, or nothing, indicating the value is not a <a href="#valid5">valid datetime</a> . If at any point the algorithm says that it "fails", this means that it returns nothing. <ol> <li> Let <var title="">input</var> be the string being parsed. </li> <li> Let <var title="">position</var> be a pointer into <var title= "">input</var> , initially pointing at the start of the string. </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is not exactly four characters long, then fail. Otherwise, interpret the resulting sequence as a <del class= "diff-old">base ten</del> <ins class="diff-chg">base-ten</ins> integer. Let that number be the <var title="">year</var> . </li> <li> If <var title="">position</var> is beyond the end of <var title= "">input</var> or if the character at <var title="">position</var> is not a U+002D HYPHEN-MINUS character, then fail. Otherwise, move <var title="">position</var> forwards one character. </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is not exactly two characters long, then fail. Otherwise, interpret the resulting sequence as a <del class= "diff-old">base ten</del> <ins class="diff-chg">base-ten</ins> integer. Let that number be the <var title="">month</var> . </li> <li>If <var title="">month</var> is not a number in the range 1 ≤  <var title="">month</var>  ≤ 12, then fail.</li> <li> Let <var title="">maxday</var> be the <a href="#number">number of days in month <var title="">month</var> of year <var title= "">year</var></a> . </li> <li> If <var title="">position</var> is beyond the end of <var title= "">input</var> or if the character at <var title="">position</var> is not a U+002D HYPHEN-MINUS character, then fail. Otherwise, move <var title="">position</var> forwards one character. </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is not exactly two characters long, then fail. Otherwise, interpret the resulting sequence as a <del class= "diff-old">base ten</del> <ins class="diff-chg">base-ten</ins> integer. Let that number be the <var title="">day</var> . </li> <li> If <var title="">day</var> is not a number in the range 1 ≤  <var title="">month</var>  ≤  <var title= "">maxday</var> , then fail. </li> <li> <a href="#collect">Collect a sequence of characters</a> that are either U+0054 LATIN CAPITAL LETTER T characters or <a href="#space" title="space character">space characters</a> . If the collected sequence is zero characters long, or if it contains more than one U+0054 LATIN CAPITAL LETTER T character, then fail. </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is not exactly two characters long, then fail. Otherwise, interpret the resulting sequence as a <del class= "diff-old">base ten</del> <ins class="diff-chg">base-ten</ins> integer. Let that number be the <var title="">hour</var> . </li> <li>If <var title="">hour</var> is not a number in the range 0 ≤  <var title="">hour</var>  ≤ 23, then fail.</li> <li> If <var title="">position</var> is beyond the end of <var title= "">input</var> or if the character at <var title="">position</var> is not a U+003A COLON character, then fail. Otherwise, move <var title="">position</var> forwards one character. </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is not exactly two characters long, then fail. Otherwise, interpret the resulting sequence as a <del class= "diff-old">base ten</del> <ins class="diff-chg">base-ten</ins> integer. Let that number be the <var title="">minute</var> . </li> <li>If <var title="">minute</var> is not a number in the range 0 ≤  <var title="">minute</var>  ≤ 59, then fail.</li> <li> Let <var title="">second</var> be a string with the value "0". </li> <li> If <var title="">position</var> is beyond the end of <var title= "">input</var> , then fail. </li> <li> If the character at <var title="">position</var> is a U+003A COLON, then: <ol> <li> Advance <var title="">position</var> to the next character in <var title="">input</var> . </li> <li> If <var title="">position</var> is beyond the end of <var title= "">input</var> , or at the last character in <var title= "">input</var> , or if the next two characters in <var title="">input</var> starting at <var title="">position</var> are not two characters both in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), then fail. </li> <li> <a href="#collect">Collect a sequence of characters</a> that are either characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9) or U+002E FULL STOP characters. If the collected sequence has more than one U+002E FULL STOP characters, or if the last character in the sequence is a U+002E FULL STOP character, then fail. Otherwise, let the collected string be <var title= "">second</var> instead of its previous value. </li> </ol> </li> <li> Interpret <var title="">second</var> as a <del class= "diff-old">base ten</del> <ins class="diff-chg">base-ten</ins> number (possibly with a fractional part). Let that number be <var title="">second</var> instead of the string version. </li> <li>If <var title="">second</var> is not a number in the range 0 ≤  <var title="">hour</var>  < 60, then fail. (The values 60 and 61 are not allowed: leap seconds cannot be represented by datetime values.)</li> <li> If <var title="">position</var> is beyond the end of <var title= "">input</var> , then fail. </li> <li> <a href="#skip-whitespace">Skip whitespace.</a> </li> <li> If the character at <var title="">position</var> is a U+005A LATIN CAPITAL LETTER Z, then: <ol> <li> Let <var title="">timezone hours</var> be 0. </li> <li> Let <var title="">timezone minutes</var> be 0. </li> <li> Advance <var title="">position</var> to the next character in <var title="">input</var> . </li> </ol> </li> <li> Otherwise, if the character at <var title="">position</var> is either a U+002B PLUS SIGN ("+") or a U+002D HYPHEN-MINUS ("-"), then: <ol> <li> If the character at <var title="">position</var> is a U+002B PLUS SIGN ("+"), let <var title="">sign</var> be "positive". Otherwise, it's a U+002D HYPHEN-MINUS ("-"); let <var title= "">sign</var> be "negative". </li> <li> Advance <var title="">position</var> to the next character in <var title="">input</var> . </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is not exactly two characters long, then fail. Otherwise, interpret the resulting sequence as a <del class= "diff-old">base ten</del> <ins class="diff-chg">base-ten</ins> integer. Let that number be the <var title="">timezone hours</var> . </li> <li>If <var title="">timezone hours</var> is not a number in the range 0 ≤  <var title="">timezone hours</var>  ≤ 23, then fail.</li> <li>If <var title="">sign</var> is "negative", then negate <var title="">timezone hours</var> .</li> <li> If <var title="">position</var> is beyond the end of <var title= "">input</var> or if the character at <var title="">position</var> is not a U+003A COLON character, then fail. Otherwise, move <var title="">position</var> forwards one character. </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is not exactly two characters long, then fail. Otherwise, interpret the resulting sequence as a <del class= "diff-old">base ten</del> <ins class="diff-chg">base-ten</ins> integer. Let that number be the <var title="">timezone minutes</var> . </li> <li>If <var title="">timezone minutes</var> is not a number in the range 0 ≤  <var title="">timezone minutes</var>  ≤ 59, then fail.</li> <li>If <var title="">sign</var> is "negative", then negate <var title="">timezone minutes</var> .</li> </ol> </li> <li> If <var title="">position</var> is not beyond the end of <var title="">input</var> , then fail. </li> <li> Let <var title="">time</var> be the moment in time at year <var title="">year</var> , month <var title="">month</var> , day <var title="">day</var> , hours <var title="">hour</var> , minute <var title="">minute</var> , second <var title="">second</var> , subtracting <var title="">timezone hours</var> hours and <var title="">timezone minutes</var> minutes. That moment in time is a moment in the UTC timezone. </li> <li> Let <var title="">timezone</var> be <var title="">timezone hours</var> hours and <var title="">timezone minutes</var> minutes from UTC. </li> <li> Return <var title="">time</var> and <var title="">timezone</var> . </li> </ol> <h5 id="vaguer">3.2.4.2. Vaguer moments in time</h5> This section defines <dfn id="date-or" title= "date or time string">date or time strings</dfn> . There are two kinds, <dfn id="date-or0" title= "date or time string in content">date or time strings in content</dfn> , and <dfn id="date-or1" title= "date or time string in attributes">date or time strings in attributes</dfn> . The only difference is in the handling of whitespace characters. To parse a <a href="#date-or">date or time string</a> , user agents must use the following algorithm. A <a href="#date-or">date or time string</a> is a valid date or time string if the following algorithm, when run on the string, doesn't say the string is invalid. The algorithm may return nothing (in which case the string will be invalid), or it may return a date, a time, a date and a time, or a date and a time and <del class="diff-old">and</del> a timezone. Even if the algorithm returns one or more values, the string can still be invalid. <ol> <li> Let <var title="">input</var> be the string being parsed. </li> <li> Let <var title="">position</var> be a pointer into <var title= "">input</var> , initially pointing at the start of the string. </li> <li> Let <var title="">results</var> be the collection of results that are to be returned (one or more of a date, a time, and a timezone), initially empty. If the algorithm aborts at any point, then whatever is currently in <var title="">results</var> must be returned as the result of the algorithm. </li> <li> For the "in content" variant: <a href="#skip-">skip Zs characters</a> ; for the "in attributes" variant: <a href= "#skip-whitespace">skip whitespace</a> . </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is empty, then the string is invalid; abort these steps. </li> <li> Let the sequence of characters collected in the last step be <var title="">s</var> . </li> <li> If <var title="">position</var> is past the end of <var title= "">input</var> , the string is invalid; abort these steps. </li> <li> If the character at <var title="">position</var> is not a U+003A COLON character, then: <ol> <li> If the character at <var title="">position</var> is not a U+002D HYPHEN-MINUS ("-") character either, then the string is invalid, abort these steps. </li> <li> If the sequence <var title="">s</var> is not exactly four digits long, then the string is invalid. (This does not stop the algorithm, however.) </li> <li> Interpret the sequence of characters collected in step 5 as a <del class="diff-old">base ten</del> <ins class= "diff-chg">base-ten</ins> integer, and let that number be <var title="">year</var> . </li> <li> Advance <var title="">position</var> past the U+002D HYPHEN-MINUS ("-") character. </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is empty, then the string is invalid; abort these steps. </li> <li> If the sequence collected in the last step is not exactly two digits long, then the string is invalid. </li> <li> Interpret the sequence of characters collected two steps ago as a <del class="diff-old">base ten</del> <ins class= "diff-chg">base-ten</ins> integer, and let that number be <var title="">month</var> . </li> <li>If <var title="">month</var> is not a number in the range 1 ≤  <var title="">month</var>  ≤ 12, then the string is invalid, abort these steps.</li> <li> Let <var title="">maxday</var> be the <a href="#number">number of days in month <var title="">month</var> of year <var title= "">year</var></a> . </li> <li> If <var title="">position</var> is past the end of <var title= "">input</var> , or if the character at <var title= "">position</var> is not a U+002D HYPHEN-MINUS ("-") character, then the string is invalid, abort these steps. Otherwise, advance <var title="">position</var> to the next character. </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is empty, then the string is invalid; abort these steps. </li> <li> If the sequence collected in the last step is not exactly two digits long, then the string is invalid. </li> <li> Interpret the sequence of characters collected two steps ago as a <del class="diff-old">base ten</del> <ins class= "diff-chg">base-ten</ins> integer, and let that number be <var title="">day</var> . </li> <li> If <var title="">day</var> is not a number in the range 1 ≤  <var title="">day</var>  ≤  <var title= "">maxday</var> , then the string is invalid, abort these steps. </li> <li> Add the date represented by <var title="">year</var> , <var title="">month</var> , and <var title="">day</var> to the <var title="">results</var> . </li> <li> For the "in content" variant: <a href="#skip-">skip Zs characters</a> ; for the "in attributes" variant: <a href= "#skip-whitespace">skip whitespace</a> . </li> <li> If the character at <var title="">position</var> is a U+0054 LATIN CAPITAL LETTER T, then move <var title="">position</var> forwards one character. </li> <li> For the "in content" variant: <a href="#skip-">skip Zs characters</a> ; for the "in attributes" variant: <a href= "#skip-whitespace">skip whitespace</a> . </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is empty, then the string is invalid; abort these steps. </li> <li> Let <var title="">s</var> be the sequence of characters collected in the last step. </li> </ol> </li> <li> If <var title="">s</var> is not exactly two digits long, then the string is invalid. </li> <li> Interpret the sequence of characters collected two steps ago as a <del class="diff-old">base ten</del> <ins class= "diff-chg">base-ten</ins> integer, and let that number be <var title="">hour</var> . </li> <li> If <var title="">hour</var> is not a number in the range 0 ≤  <var title="">hour</var>  ≤ 23, then the string is invalid, abort these steps. </li> <li> If <var title="">position</var> is past the end of <var title= "">input</var> , or if the character at <var title= "">position</var> is not a U+003A COLON character, then the string is invalid, abort these steps. Otherwise, advance <var title="">position</var> to the next character. </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is empty, then the string is invalid; abort these steps. </li> <li> If the sequence collected in the last step is not exactly two digits long, then the string is invalid. </li> <li> Interpret the sequence of characters collected two steps ago as a <del class="diff-old">base ten</del> <ins class= "diff-chg">base-ten</ins> integer, and let that number be <var title="">minute</var> . </li> <li> If <var title="">minute</var> is not a number in the range 0 ≤  <var title="">minute</var>  ≤ 59, then the string is invalid, abort these steps. </li> <li> Let <var title="">second</var> be 0. It may be changed to another value in the next step. </li> <li> If <var title="">position</var> is not past the end of <var title="">input</var> and the character at <var title= "">position</var> is a U+003A COLON character, then: <ol> <li> <a href="#collect">Collect a sequence of characters</a> that are either characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9) or are U+002E FULL STOP. If the collected sequence is empty, or contains more than one U+002E FULL STOP character, then the string is invalid; abort these steps. </li> <li> If the first character in the sequence collected in the last step is not in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), then the string is invalid. </li> <li> Interpret the sequence of characters collected two steps ago as a <del class="diff-old">base ten</del> <ins class= "diff-chg">base-ten</ins> number (possibly with a fractional part), and let that number be <var title="">second</var> . </li> <li> If <var title="">second</var> is not a number in the range 0 ≤  <var title="">minute</var>  < 60, then the string is invalid, abort these steps. </li> </ol> </li> <li> Add the time represented by <var title="">hour</var> , <var title="">minute</var> , and <var title="">second</var> to the <var title="">results</var> . </li> <li> If <var title="">results</var> has both a date and a time, then: <ol> <li> For the "in content" variant: <a href="#skip-">skip Zs characters</a> ; for the "in attributes" variant: <a href= "#skip-whitespace">skip whitespace</a> . </li> <li> If <var title="">position</var> is past the end of <var title= "">input</var> , then skip to the next step in the overall set of steps. </li> <li> Otherwise, if the character at <var title="">position</var> is a U+005A LATIN CAPITAL LETTER Z, then: <ol> <li> Add the timezone corresponding to UTC (zero offset) to the <var title="">results</var> . </li> <li> Advance <var title="">position</var> to the next character in <var title="">input</var> . </li> <li> Skip to the next step in the overall set of steps. </li> </ol> </li> <li> Otherwise, if the character at <var title="">position</var> is either a U+002B PLUS SIGN ("+") or a U+002D HYPHEN-MINUS ("-"), then: <ol> <li> If the character at <var title="">position</var> is a U+002B PLUS SIGN ("+"), let <var title="">sign</var> be "positive". Otherwise, it's a U+002D HYPHEN-MINUS ("-"); let <var title= "">sign</var> be "negative". </li> <li> Advance <var title="">position</var> to the next character in <var title="">input</var> . </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is not exactly two characters long, then the string is invalid. </li> <li> Interpret the sequence collected in the last step as a <del class="diff-old">base ten</del> <ins class= "diff-chg">base-ten</ins> number, and let that number be <var title="">timezone hours</var> . </li> <li>If <var title="">timezone hours</var> is not a number in the range 0 ≤  <var title="">timezone hours</var>  ≤ 23, then the string is invalid; abort these steps.</li> <li>If <var title="">sign</var> is "negative", then negate <var title="">timezone hours</var> .</li> <li> If <var title="">position</var> is beyond the end of <var title= "">input</var> or if the character at <var title="">position</var> is not a U+003A COLON character, then the string is invalid; abort these steps. Otherwise, move <var title="">position</var> forwards one character. </li> <li> <a href="#collect">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected sequence is not exactly two characters long, then the string is invalid. </li> <li> Interpret the sequence collected in the last step as a <del class="diff-old">base ten</del> <ins class= "diff-chg">base-ten</ins> number, and let that number be <var title="">timezone minutes</var> . </li> <li>If <var title="">timezone minutes</var> is not a number in the range 0 ≤  <var title="">timezone minutes</var>  ≤ 59, then the string is invalid; abort these steps.</li> <li> Add the timezone corresponding to an offset of <var title= "">timezone hours</var> hours and <var title= "">timezone minutes</var> minutes to the <var title="">results</var> . </li> <li> Skip to the next step in the overall set of steps. </li> </ol> </li> <li> Otherwise, the string is invalid; abort these steps. </li> </ol> </li> <li> For the "in content" variant: <a href="#skip-">skip Zs characters</a> ; for the "in attributes" variant: <a href= "#skip-whitespace">skip whitespace</a> . </li> <li> If <var title="">position</var> is not past the end of <var title="">input</var> , then the string is invalid. </li> <li> Abort these steps (the string is parsed). </li> </ol> <h4 id="time-offsets"><del class= "diff-old">3.2.5.</del> <ins class="diff-chg">3.2.5</ins> Time offsets</h4> <dfn id="valid6">valid time offset</dfn> , <dfn id="rules4">rules for parsing time offsets</dfn> , <dfn id= "time-offset">time offset <del class="diff-old">serialisation</del> <ins class="diff-chg">serialization</ins> rules</dfn> ; in the format "5d4h3m2s1ms" or "3m 9.2s" or "00:00:00.00" or similar. <h4 id="tokens"><del class= "diff-old">3.2.6.</del> <ins class="diff-chg">3.2.6</ins> Tokens</h4> A <dfn id="set-of">set of space-separated tokens</dfn> is a set of zero or more words separated by one or more <a href="#space" title="space character">space characters</a> , where words consist of any string of one or more characters, none of which are <a href= "#space" title="space character">space characters</a> . A string containing a <a href="#set-of">set of space-separated tokens</a> may have leading or trailing <a href="#space" title= "space character">space characters</a> . An <dfn id="unordered">unordered set of unique space-separated tokens</dfn> is a <a href="#set-of">set of space-separated tokens</a> where none of the words are duplicated. An <dfn id="ordered">ordered set of unique space-separated tokens</dfn> is a <a href="#set-of">set of space-separated tokens</a> where none of the words are duplicated but where the order of the tokens is meaningful. <a href="#set-of" title= "set of space-separated tokens"><ins class="diff-new">Sets of space-separated tokens</ins></a> <ins class="diff-new">sometimes have a defined set of allowed values. When a set of allowed values is defined, the tokens must all be from that list of allowed values; other values are non-conforming. If no such set of allowed values is provided, then all values are conforming.</ins> When a user agent has to <dfn id="split">split a string on spaces</dfn> , it must use the following algorithm: <ol> <li> Let <var title="">input</var> be the string being parsed. </li> <li> Let <var title="">position</var> be a pointer into <var title= "">input</var> , initially pointing at the start of the string. </li> <li> Let <var title="">tokens</var> be a list of tokens, initially empty. </li> <li> <a href="#skip-whitespace">Skip whitespace</a> </li> <li> While <var title="">position</var> is not past the end of <var title="">input</var> : <ol> <li> <a href="#collect">Collect a sequence of characters</a> that are not <a href="#space" title="space character">space characters</a> . </li> <li> Add the string collected in the previous step to <var title= "">tokens</var> . </li> <li> <a href="#skip-whitespace">Skip whitespace</a> </li> </ol> </li> <li> Return <var title="">tokens</var> . </li> </ol> When a user agent has to <dfn id="remove0">remove a token from a string</dfn> , it must use the following algorithm: <ol> <li> Let <var title="">input</var> be the string being modified. </li> <li> Let <var title="">token</var> be the token being removed. It will not contain any <a href="#space" title="space character">space characters</a> . </li> <li> Let <var title="">output</var> be the output string, initially empty. </li> <li> Let <var title="">position</var> be a pointer into <var title= "">input</var> , initially pointing at the start of the string. </li> <li> If <var title="">position</var> is beyond the end of <var title= "">input</var> , set the string being modified to <var title= "">output</var> , and abort these steps. </li> <li> If the character at <var title="">position</var> is a <a href= "#space">space character</a> : <ol> <li> Append the character at <var title="">position</var> to the end of <var title="">output</var> . </li> <li> Increment <var title="">position</var> so it points at the next character in <var title="">input</var> . </li> <li> Return to step 5 in the overall set of steps. </li> </ol> </li> <li> Otherwise, the character at <var title="">position</var> is the first character of a token. <a href="#collect">Collect a sequence of characters</a> that are not <a href="#space" title= "space character">space characters</a> , and let that be <var title="">s</var> . </li> <li> If <var title="">s</var> is exactly equal to <var title= "">token</var> , then: <ol> <li> <a href="#skip-whitespace">Skip whitespace</a> (in <var title= "">input</var> ). </li> <li> Remove any <a href="#space" title="space character">space characters</a> currently at the end of <var title="">output</var> . </li> <li> If <var title="">position</var> is not past the end of <var title="">input</var> , and <var title="">output</var> is not the empty string, append a single U+0020 SPACE character at the end of <var title="">output</var> . </li> </ol> </li> <li> Otherwise, append <var title="">s</var> to the end of <var title="">output</var> . </li> <li> Return to step 6 in the overall set of steps. </li> </ol> This causes any occurrences of the token to be removed from the string, and any spaces that were surrounding the token to be collapsed to a single space, except at the start and end of the string, where such spaces are removed. <h4 id="keywords"><del class= "diff-old">3.2.7.</del> <ins class="diff-chg">3.2.7</ins> Keywords and enumerated attributes</h4> Some attributes are defined as taking one of a finite set of keywords. Such attributes are called <dfn id="enumerated" title= "enumerated attribute">enumerated attributes</dfn> . The keywords are each defined to map to a particular state (several keywords might map to the same state, in which case some of the keywords are synonyms of each other; additionally, some of the keywords can be said to be non-conforming, and are only in the specification for historical reasons). In addition, two default states can be given. The first is the invalid value default , the second is the missing value default . If an enumerated attribute is specified, the attribute's value must be one of the given keywords that are not said to be non-conforming, with no leading or trailing whitespace. The keyword may use any mix of uppercase and lowercase letters. When the attribute is specified, if its value case-insensitively matches one of the given keywords then that keyword's state is the state that the attribute represents. If the attribute value matches none of the given keywords, but the attribute has an invalid value default , then the attribute represents that state. Otherwise, if the attribute value matches none of the keywords but there is a missing value default state defined, then that is the state represented by the attribute. Otherwise, there is no default, and invalid values must <del class="diff-old">simply</del> be ignored. When the attribute is not specified, if there is a missing value default state defined, then that is the state represented by the (missing) attribute. Otherwise, the absence of the attribute means that there is no state represented. The empty string can be one of the keywords in some cases. For example the <code title="attr-contenteditable"><a href= "#contenteditable0">contenteditable</a></code> attribute has two states: true , matching the <code title="">true</code> keyword and the empty string, false , matching <code title="">false</code> and all other keywords (it's the invalid value default ). It could further be thought of as having a third state inherit , which would be the default when the attribute is not specified at all (the missing value default ), but for various reasons that isn't the way this specification actually defines it. <h4 id="syntax-references"><del class= "diff-old">3.2.8.</del> <ins class="diff-chg">3.2.8</ins> References</h4> A <dfn id="valid7">valid <del class="diff-old">hashed ID</del> <ins class="diff-chg">hash-name</ins> reference</dfn> to an element of type <var title="">type</var> is a string consisting of a U+0023 NUMBER SIGN ( <code title="">#</code> ) character followed by a string which exactly matches the value of the <del class= "diff-old">id</del> <code title=""><ins class= "diff-chg">name</ins></code> attribute of an element in the document with type <var title="">type</var> . The <dfn id="rules5">rules for parsing a <del class= "diff-old">hashed ID</del> <ins class="diff-chg">hash-name</ins> reference</dfn> to an element of type <var title="">type</var> are as follows: <ol> <li> If the string being parsed does not contain a U+0023 NUMBER SIGN character, or if the first such character in the string is the last character in the string, then return null and abort these steps. </li> <li> Let <var title="">s</var> be the string from the character immediately after the first U+0023 NUMBER SIGN character in the string being parsed up to the end of that string. </li> <li> Return the first element of type <var title="">type</var> that has an <code title="attr-id"><a href="#id">id</a></code> or <code title="">name</code> attribute whose value case-insensitively matches <var title="">s</var> . </li> </ol> <h4 id="urls"><ins class= "diff-new">3.2.9</ins> <ins class="diff-new">URLs</ins></h4> <div class="big-issue"> <ins class="diff-new">This section will do the following:</ins> <ul> <li><ins class="diff-new">define how to resolve relative URLs in markup attributes (using XMLBase as defined elsewhere right now)</ins></li> <li><ins class="diff-new">define how to resolve relative URLs in APIs, using the</ins> <dfn id="scripts0"><ins class= "diff-new">script's base URI</ins></dfn> <ins class= "diff-new">maybe</ins></li> <li><ins class="diff-new">define what it means to resolve a relative URL when the base URL doesn't have a path hierarchy (e.g. data:, javascript:, about:blank URLs)</ins></li> <li><ins class="diff-new">define how to handle URIs that contain non-ascii characters (and it's not the same as handling as IRIs, especially if the character encoding of the document isn't UTF-8)</ins></li> <li><ins class="diff-new">define URL as IRI and replace all uses of URIs and IRIs in the rest of the spec with URL</ins></li> <li><ins class="diff-new">define "valid URL" in terms of valid URIs and IRIs and replace that concept through the spec to a pointer here, getting rid of references to</ins> <a href= "#references"><ins class="diff-new">[RFC3986]</ins></a> <a href= "#references"><ins class="diff-new">[RFC3987]</ins></a></li> <li><ins class="diff-new">define "valid URL reference" in terms of valid URI references and IRI references and replace that concept through the spec to a pointer here, getting rid of references to</ins> <a href="#references"><ins class= "diff-new">[RFC3986]</ins></a> <a href="#references"><ins class= "diff-new">[RFC3987]</ins></a></li> <li><ins class="diff-new">define how to parse URLs (maybe by deferring to RFCs)</ins></li> <li><ins class="diff-new">define "an</ins> <dfn id= "elements2"><ins class="diff-new">element's base URI</ins></dfn> <ins class="diff-new">" and make the various places that talk about a base URI in the context of an element use that definition</ins></li> <li><ins class="diff-new">make the language used to refer to resolving a base URI consistent throughout, maybe make it hyperlink to a definition each time</ins></li> <li><ins class="diff-new">define a cheap, interoperable mechanism for URL attributes and anything else that relies on xml:base and the base element to handle dynamic changes to those attributes and elements, possibly by defining some mechanism which causes changes to be ignored in some reliable way.</ins></li> </ul> </div> <h3 id="documents0"><del class= "diff-old">3.3.</del> <ins class="diff-chg">3.3</ins> Documents and document fragments</h3> <h4 id="semantics0"><del class= "diff-old">3.3.1.</del> <ins class="diff-chg">3.3.1</ins> Semantics</h4> Elements, attributes, and attribute values in HTML are defined (by this specification) to have certain meanings (semantics). For example, the <code><a href="#ol">ol</a></code> element represents an ordered list, and the <code title="lang">lang</code> attribute represents the language of the content. Authors must <del class="diff-old">only</del> <ins class= "diff-chg">not</ins> use elements, attributes, and attribute values for <ins class="diff-new">purposes other than</ins> their appropriate <ins class="diff-new">intended</ins> semantic <del class="diff-old">purposes.</del> <ins class= "diff-chg">purpose.</ins> <div class="example"> For example, the following document is non-conforming, despite being syntactically correct: <pre> <!DOCTYPE html> <html lang="en-GB"> <head> <title> Demonstration </title> </head> <body> <table> <tr> <td> My favourite animal is the cat. </td> </tr> <tr> <td> —<a href="http://example.org/~ernest/"><cite>Ernest</cite></a>, in an essay from 1992 </td> </tr> </table> </body> </html> </pre> ...because the data placed in the cells is clearly not tabular <del class="diff-old">data.</del> <ins class="diff-chg">data (and the</ins> <code><a href="#cite2"><ins class= "diff-chg">cite</ins></a></code> <ins class="diff-chg">element mis-used).</ins> A corrected version of this document might be: <pre> <!DOCTYPE html> <html lang="en-GB"> <head> <title> Demonstration </title> </head> <body> <blockquote> <p> My favourite animal is the cat. </p> </blockquote> <p> <del class= "diff-old"> —<a href="http://example.org/~ernest/"><cite>Ernest</cite></a>, </del> <ins class= "diff-chg"> —<a href="http://example.org/~ernest/">Ernest</a>, </ins> in an essay from 1992 </p> </body> </html> </pre> This next document fragment, intended to represent the heading of a corporate site, is similarly non-conforming because the second line is not intended to be a heading of a subsection, but merely a subheading or subtitle (a subordinate heading for the same section). <pre> <body> <h1>ABC Company</h1> <h2>Leading the way in widget design since 1432</h2> ... </pre> The <code><a href="#header">header</a></code> element should be used in these kinds of situations: <pre> <body> <header> <h1>ABC Company</h1> <h2>Leading the way in widget design since 1432</h2> </header> ... </pre></div> Through scripting and using other mechanisms, the values of attributes, text, and indeed the entire structure of the document may change dynamically while a user agent is processing it. The semantics of a document at an instant in time are those represented by the state of the document at that instant in time, and the semantics of a document can therefore change over time. User agents must update their presentation of the document as this occurs. HTML has a <code><a href= "#progress">progress</a></code> element that describes a progress bar. If its "value" attribute is dynamically updated by a script, the UA would update the rendering to show the progress changing. <h4 id="structure0"><del class= "diff-old">3.3.2.</del> <ins class="diff-chg">3.3.2</ins> Structure</h4> All the elements in this specification have a defined content model, which describes what nodes are allowed inside the elements, and thus what the structure of an HTML document or fragment must look like. <del class="diff-old">Authors must only put elements inside an element if that element allows them to be there according to its content model.</del> As noted in the conformance and terminology sections, for the purposes of determining if an element matches its content model or not, <a href="#text-node" title= "text node"><code>CDATASection</code> nodes in the DOM are treated as equivalent to <code>Text</code> nodes</a> , and <a href= "#entity-references">entity reference nodes are treated as if they were expanded in place</a> . The <a href="#space" title="space character">space characters</a> are always allowed between elements. User agents represent these characters between elements in the source markup as text nodes in the DOM. Empty <a href="#text-node" title= "text node">text nodes</a> and <a href="#text-node" title= "text node">text nodes</a> consisting of just sequences of those characters are considered <dfn id="inter-element">inter-element whitespace</dfn> . <a href="#inter-element">Inter-element whitespace</a> , comment nodes, and processing instruction nodes must be ignored when establishing whether an element matches its content model or not, and must be ignored when following algorithms that define document and element semantics. An element <var title="">A</var> is said to be <dfn id= "preceded">preceded or followed</dfn> by a second element <var title="">B</var> if <var title="">A</var> and <var title= "">B</var> have the same parent node and there are no other element nodes or text nodes (other than <a href= "#inter-element">inter-element whitespace</a> ) between them. Authors must <del class="diff-old">only</del> <ins class= "diff-chg">not</ins> use <a href="#elements1">elements in the HTML namespace</a> <del class="diff-old">in the contexts</del> <ins class="diff-chg">anywhere except</ins> where they are <ins class="diff-new">explicitly</ins> allowed, as defined for each <del class="diff-old">element.</del> <ins class="diff-chg">element, or as explicitly required by other specifications.</ins> For XML compound documents, these contexts could be inside elements from other namespaces, if those elements are defined as providing the relevant contexts. <div class="example"> The SVG specification defines the SVG <code>foreignObject</code> element as allowing foreign namespaces to be included, thus allowing compound documents to be created by inserting subdocument content under that element. This specification defines the XHTML <code><a href="#html">html</a></code> element as being allowed where subdocument fragments are allowed in a compound document. Together, these two definitions mean that placing an XHTML <code><a href="#html">html</a></code> element as a child of an SVG <code>foreignObject</code> element is conforming. <a href= "#references"><ins class="diff-new">[SVG]</ins></a> </div> <div class="example"> <ins class="diff-new">The Atom specification defines the Atom</ins> <code title=""><ins class= "diff-new">content</ins></code> <ins class="diff-new">element, when its</ins> <code title=""><ins class="diff-new">type</ins></code> <ins class="diff-new">attribute has the value</ins> <code title= ""><ins class="diff-new">xhtml</ins></code> ,<ins class= "diff-new">as requiring that it contains a single HTML</ins> <code><a href="#div"><ins class="diff-new">div</ins></a></code> <ins class="diff-new">element. Thus, a</ins> <code><a href= "#div"><ins class="diff-new">div</ins></a></code> <ins class= "diff-new">element is allowed in that context, even though this is not explicitly normatively stated by this specification.</ins> <a href="#references"><ins class="diff-new">[ATOM]</ins></a> </div> <ins class="diff-new">In addition,</ins> <a href= "#elements1"><ins class="diff-new">elements in the HTML namespace</ins></a> <ins class="diff-new">may be orphan nodes (i.e. without a parent node).</ins> <div class="example"> <ins class="diff-new">For example, creating a</ins> <code><a href="#td"><ins class="diff-new">td</ins></a></code> <ins class="diff-new">element and storing it in a global variable in a script is conforming, even though</ins> <code><a href= "#td"><ins class="diff-new">td</ins></a></code> <ins class= "diff-new">elements are otherwise only supposed to be used inside</ins> <code><a href="#tr"><ins class= "diff-new">tr</ins></a></code> <ins class= "diff-new">elements.</ins> <pre> var data = {<ins class="diff-new"> name: "Banana", cell: document.createElement('td'), }; </ins> </pre></div> <h4 id="kinds"><del class= "diff-old">3.3.3.</del> <ins class="diff-chg">3.3.3</ins> Kinds of content</h4> Each element in HTML falls into zero or more categories that group elements with similar characteristics together. The following categories are used in this specification: <ul class="brief"> <li><a href="#metadata0">Metadata content</a></li> <li><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a></li> <li><a href="#sectioning0">Sectioning content</a></li> <li><a href="#heading0">Heading content</a></li> <li><a href="#phrasing0">Phrasing content</a></li> <li><a href="#embedded1">Embedded content</a></li> <li>Form control content</li> <li><a href="#interactive1">Interactive content</a></li> </ul> Some elements have unique requirements and do not fit into any particular category. <h5 id="metadata">3.3.3.1. Metadata content</h5> <dfn id="metadata0">Metadata content</dfn> is content that sets up the presentation or <del class="diff-old">behaviour</del> <ins class="diff-chg">behavior</ins> of the rest of the content, or that sets up the relationship of the document with other documents, or that conveys other "out of band" information. Elements from other namespaces whose semantics are primarily metadata-related (e.g. RDF) are also <a href="#metadata0">metadata content</a> . <h5 id="flow-content">3.3.3.2. <del class="diff-old">Prose</del> <ins class="diff-chg">Flow</ins> content</h5> Most elements that are used in the body of documents and applications are <del class="diff-old">categorised</del> <ins class="diff-chg">categorized</ins> as <del class= "diff-old">prose</del> <dfn id="flow-content0"><ins class= "diff-chg">flow</ins> content</dfn> . As a general rule, elements whose content model allows any <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> should have either at least one descendant text node that is not <a href="#inter-element">inter-element whitespace</a> , or at least one descendant element node that is <a href="#embedded1">embedded content</a> . For the purposes of this requirement, <code><a href= "#del">del</a></code> elements and their descendants must not be counted as contributing to the ancestors of the <code><a href= "#del">del</a></code> element. This requirement is not a hard requirement, however, as there are many cases where an element can be empty legitimately, for example when it is used as a placeholder which will later be filled in by a script, or when the element is part of a template and would on most pages be filled in but on some pages is not relevant. <h5 id="sectioning">3.3.3.3. Sectioning content</h5> <dfn id="sectioning0">Sectioning content</dfn> is content that defines the scope of <a href="#heading0" title= "heading content">headers</a> , <a href="#footer" title= "footer">footers</a> , and <a href="#address" title= "address">contact information</a> . Each <a href="#sectioning0">sectioning content</a> element potentially has a heading. See the section on <a href= "#headings0">headings and sections</a> for further details. <h5 id="heading">3.3.3.4. Heading content</h5> <dfn id="heading0">Heading content</dfn> defines the header of a section (whether explicitly marked up using <a href= "#sectioning0">sectioning content</a> elements, or implied by the heading content itself). <h5 id="phrasing">3.3.3.5. Phrasing content</h5> <dfn id="phrasing0">Phrasing content</dfn> is the text of the document, as well as elements that mark up that text at the intra-paragraph level. Runs of <a href="#phrasing0">phrasing content</a> form <a href="#paragraph" title= "paragraph">paragraphs</a> . All <a href="#phrasing0">phrasing content</a> is also <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> . Any content model that expects <del class="diff-old">prose</del> <a href="#flow-content0"><ins class="diff-chg">flow</ins> content</a> also expects <a href="#phrasing0">phrasing content</a> . As a general rule, elements whose content model allows any <a href="#phrasing0">phrasing content</a> should have either at least one descendant text node that is not <a href= "#inter-element">inter-element whitespace</a> , or at least one descendant element node that is <a href="#embedded1">embedded content</a> . For the purposes of this requirement, nodes that are descendants of <code><a href="#del">del</a></code> elements must not be counted as contributing to the ancestors of the <code><a href="#del">del</a></code> element. Most elements that are <del class= "diff-old">categorised</del> <ins class= "diff-chg">categorized</ins> as phrasing content can only contain elements that are themselves <del class= "diff-old">categorised</del> <ins class= "diff-chg">categorized</ins> as phrasing content, not any <del class="diff-old">prose</del> <ins class="diff-chg">flow</ins> content. Text nodes that are not <a href="#inter-element">inter-element whitespace</a> are <a href="#phrasing0">phrasing content</a> . <h5 id="embedded">3.3.3.6. Embedded content</h5> <dfn id="embedded1">Embedded content</dfn> is content that imports another resource into the document, or content from another vocabulary that is inserted into the document. All <a href="#embedded1">embedded content</a> is also <a href= "#phrasing0">phrasing content</a> (and <del class= "diff-old">prose</del> <a href="#flow-content0"><ins class= "diff-chg">flow</ins> content</a> ). Any content model that expects <a href="#phrasing0">phrasing content</a> (or <del class= "diff-old">prose</del> <a href="#flow-content0"><ins class= "diff-chg">flow</ins> content</a> ) also expects <a href= "#embedded1">embedded content</a> . Elements that are from namespaces other than the <a href= "#html-namespace0">HTML namespace</a> and that convey content but not metadata, are <a href="#embedded1">embedded content</a> for the purposes of the content models defined in this specification. (For example, MathML, or SVG.) Some embedded content elements can have <dfn id= "fallback">fallback content</dfn> : content that is to be used when the external resource cannot be used (e.g. because it is of an unsupported format). The element definitions state what the fallback is, if any. <h5 id="interactive0">3.3.3.7. Interactive content</h5> Parts of this section should eventually be moved to DOM3 Events. <dfn id="interactive1">Interactive content</dfn> is content that is specifically intended for user interaction. Certain elements in HTML can be activated, for instance <code><a href="#a">a</a></code> elements, <code>button</code> elements, or <code>input</code> elements when their <code>type</code> attribute is set to <code>radio</code> . Activation of those elements can happen in various (UA-defined) ways, for instance via the mouse or keyboard. When activation is performed via some method other than clicking the pointing device, the default action of the event that triggers the activation must, instead of being activating the element directly, be to <a href="#firing">fire a <code title= "">click</code> event</a> on the same element. The default action of this <code title= "event-click">click</code> event, or of the real <code title= "event-click">click</code> event if the element was activated by clicking a pointing device, must be to fire a further <code title= "event-DOMActivate">DOMActivate</code> event at the same element, whose own default action is to go through all the elements the <code title="event-DOMActivate">DOMActivate</code> event bubbled through (starting at the target node and going towards the <code>Document</code> node), looking for an element with an <a href="#activation0">activation behavior</a> ; the first element, in reverse tree order, to have one, must have its activation behavior executed. The above doesn't happen for arbitrary synthetic events dispatched by author script. However, the <code title= "dom-click"><a href="#click">click()</a></code> method can be used to make it happen programmatically. For certain form controls, this process is complicated further by <a href= "http://www.whatwg.org/specs/web-forms/current-work/#the-click">changes that must happen around the click event</a> . <a href= "#references">[WF2]</a> Most interactive elements have content models that disallow nesting interactive elements. <h4 id="transparent"><del class= "diff-old">3.3.4.</del> <ins class="diff-chg">3.3.4</ins> Transparent content models</h4> Some elements are described as <dfn id= "transparent0">transparent</dfn> ; they have "transparent" as their content model. Some elements are described as <dfn id= "semi-transparent">semi-transparent</dfn> ; this means that part of their content model is "transparent" but that is not the only part of the content model that must be satisfied. When a content model includes a part that is "transparent", those parts must <del class="diff-old">only</del> <ins class= "diff-chg">not</ins> contain content that would <del class= "diff-old">still</del> <ins class="diff-chg">not</ins> be conformant if all transparent and semi-transparent elements in the tree were replaced, in their parent element, by the children in the "transparent" part of their content model, retaining order. When a transparent or semi-transparent element has no parent, then the part of its content model that is "transparent" must instead be treated as accepting any <del class= "diff-old">prose</del> <a href="#flow-content0"><ins class= "diff-chg">flow</ins> content</a> . <h4 id="paragraphs"><del class= "diff-old">3.3.5.</del> <ins class="diff-chg">3.3.5</ins> Paragraphs</h4> A <dfn id="paragraph">paragraph</dfn> is typically a block of text with one or more sentences that discuss a particular topic, as in typography, but can also be used for more general thematic grouping. For instance, an address is also a paragraph, as is a part of a form, a byline, or a stanza in a poem. Paragraphs in <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> are defined relative to what the document looks like without the <code><a href="#ins">ins</a></code> and <code><a href= "#del">del</a></code> elements complicating matters. Let <var title="">view</var> be a view of the DOM that replaces all <code><a href="#ins">ins</a></code> and <code><a href= "#del">del</a></code> elements in the document with their contents. Then, in <var title="">view</var> , for each run of <a href= "#phrasing0">phrasing content</a> uninterrupted by other types of content, in an element that accepts content other than <a href= "#phrasing0">phrasing content</a> , let <var title="">first</var> be the first node of the run, and let <var title="">last</var> be the last node of the run. For each run, a paragraph exists in the original DOM from immediately before <var title="">first</var> to immediately after <var title="">last</var> . (Paragraphs can thus span across <code><a href="#ins">ins</a></code> and <code><a href= "#del">del</a></code> elements.) A <a href="#paragraph">paragraph</a> is also formed by <code><a href="#p">p</a></code> elements. The <code><a href="#p">p</a></code> element can be used to wrap individual paragraphs when there would otherwise not be any content other than phrasing content to separate the paragraphs from each other. <div class="example"> In the following example, there are two paragraphs in a section. There is also a header, which contains phrasing content that is not a paragraph. Note how the comments and intra-element whitespace do not form paragraphs. <pre> <section> <h1>Example of paragraphs</h1> This is the <em>first paragraph in this example. <p>This is the second. <!-- This is not a paragraph. --> </section> </pre> The following example takes that markup and puts <code><a href= "#ins">ins</a></code> and <code><a href="#del">del</a></code> elements around some of the markup to show that the text was changed (though in this case, the changes don't really make much sense, admittedly). Notice how this example has exactly the same paragraphs as the previous one, despite the <code><a href= "#ins">ins</a></code> and <code><a href="#del">del</a></code> elements. <pre> <section> <ins><h1>Example of paragraphs</h1> This is the <em>first paragraph in</ins> this example<del>. <p>This is the second.</del> <!-- This is not a paragraph. --> </section> </pre></div> <h3 id="global"><del class= "diff-old">3.4.</del> <ins class="diff-chg">3.4</ins> Global attributes</h3> The following attributes are common to and may be specified on all <a href="#html-elements">HTML elements</a> (even those not defined in this specification): <dl class="element"> <dt>Global attributes:</dt> <dd><code title="attr-class"><a href="#class">class</a></code></dd> <dd><code title="attr-contenteditable"><a href= "#contenteditable0">contenteditable</a></code></dd> <dd><code title="attr-contextmenu"><a href= "#contextmenu">contextmenu</a></code></dd> <dd><code title="attr-dir"><a href="#dir">dir</a></code></dd> <dd><code title="attr-draggable"><a href= "#draggable">draggable</a></code></dd> <dd><code title="attr-id"><a href="#id">id</a></code></dd> <dd><code title="attr-irrelevant"><a href= "#irrelevant">irrelevant</a></code></dd> <dd><code title="attr-lang"><a href="#lang">lang</a></code></dd> <dd><code title="attr-ref"><a href="#ref">ref</a></code></dd> <dd><code title="attr-registrationmark"><a href= "#registrationmark">registrationmark</a></code></dd> <dd><code title="attr-style"><a href="#style"><ins class= "diff-new">style</ins></a></code></dd> <dd><code title="attr-tabindex"><a href= "#tabindex">tabindex</a></code></dd> <dd><code title="attr-template"><a href= "#template">template</a></code></dd> <dd><code title="attr-title"><a href="#title">title</a></code></dd> </dl> In addition, the following <a href="#event3">event handler content attributes</a> may be specified on any HTML element : <dl class="element"> <dt>Event handler content attributes:</dt> <dd><code title="handler-onabort"><a href= "#onabort">onabort</a></code></dd> <dd><code title="handler-onbeforeunload"><a href= "#onbeforeunload">onbeforeunload</a></code></dd> <dd><code title="handler-onblur"><a href= "#onblur">onblur</a></code></dd> <dd><code title="handler-onchange"><a href= "#onchange">onchange</a></code></dd> <dd><code title="handler-onclick"><a href= "#onclick">onclick</a></code></dd> <dd><code title="handler-oncontextmenu"><a href= "#oncontextmenu">oncontextmenu</a></code></dd> <dd><code title="handler-ondblclick"><a href= "#ondblclick">ondblclick</a></code></dd> <dd><code title="handler-ondrag"><a href= "#ondrag">ondrag</a></code></dd> <dd><code title="handler-ondragend"><a href= "#ondragend">ondragend</a></code></dd> <dd><code title="handler-ondragenter"><a href= "#ondragenter">ondragenter</a></code></dd> <dd><code title="handler-ondragleave"><a href= "#ondragleave">ondragleave</a></code></dd> <dd><code title="handler-ondragover"><a href= "#ondragover">ondragover</a></code></dd> <dd><code title="handler-ondragstart"><a href= "#ondragstart">ondragstart</a></code></dd> <dd><code title="handler-ondrop"><a href= "#ondrop">ondrop</a></code></dd> <dd><code title="handler-onerror"><a href= "#onerror">onerror</a></code></dd> <dd><code title="handler-onfocus"><a href= "#onfocus">onfocus</a></code></dd> <dd><code title="handler-onkeydown"><a href= "#onkeydown">onkeydown</a></code></dd> <dd><code title="handler-onkeypress"><a href= "#onkeypress">onkeypress</a></code></dd> <dd><code title="handler-onkeyup"><a href= "#onkeyup">onkeyup</a></code></dd> <dd><code title="handler-onload"><a href= "#onload">onload</a></code></dd> <dd><code title="handler-onmessage"><a href= "#onmessage">onmessage</a></code></dd> <dd><code title="handler-onmousedown"><a href= "#onmousedown">onmousedown</a></code></dd> <dd><code title="handler-onmousemove"><a href= "#onmousemove">onmousemove</a></code></dd> <dd><code title="handler-onmouseout"><a href= "#onmouseout">onmouseout</a></code></dd> <dd><code title="handler-onmouseover"><a href= "#onmouseover">onmouseover</a></code></dd> <dd><code title="handler-onmouseup"><a href= "#onmouseup">onmouseup</a></code></dd> <dd><code title="handler-onmousewheel"><a href= "#onmousewheel">onmousewheel</a></code></dd> <dd><code title="handler-onresize"><a href= "#onresize">onresize</a></code></dd> <dd><code title="handler-onscroll"><a href= "#onscroll">onscroll</a></code></dd> <dd><code title="handler-onselect"><a href= "#onselect">onselect</a></code></dd> <dd><code title="handler-onstorage"><a href= "#onstorage"><ins class="diff-new">onstorage</ins></a></code></dd> <dd><code title="handler-onsubmit"><a href= "#onsubmit">onsubmit</a></code></dd> <dd><code title="handler-onunload"><a href= "#onunload">onunload</a></code></dd> </dl> <ins class="diff-new">Also,</ins> <a href="#custom" title= "custom data attribute"><ins class="diff-new">custom data attributes</ins></a> <ins class="diff-new">(e.g.</ins> <code title= ""><ins class="diff-new">data-foldername</ins></code> <ins class= "diff-new">or</ins> <code title=""><ins class= "diff-new">data-msgid</ins></code> <ins class="diff-new">) can be specified on any</ins> <ins class="diff-new">HTML element</ins> ,<ins class="diff-new">to store custom data specific to the page.</ins> <ins class="diff-new">In</ins> <a href="#html-"><ins class= "diff-new">HTML documents</ins></a> ,<ins class= "diff-new">the</ins> <code><a href="#html"><ins class= "diff-new">html</ins></a></code> <ins class="diff-new">element, and any other elements in the</ins> <a href= "#html-namespace0"><ins class="diff-new">HTML namespace</ins></a> <ins class="diff-new">whose parent element is not in the</ins> <a href="#html-namespace0"><ins class="diff-new">HTML namespace</ins></a> ,<ins class="diff-new">may have an</ins> <code title=""><ins class="diff-new">xmlns</ins></code> <ins class= "diff-new">attribute specified, if, and only if, it has the exact value "</ins> <code><ins class= "diff-new">http://www.w3.org/1999/xhtml</ins></code> <ins class= "diff-new">". This does not apply to</ins> <a href= "#xml-documents"><ins class="diff-new">XML documents</ins></a> . <ins class="diff-new">In HTML, the</ins> <code title=""><ins class="diff-new">xmlns</ins></code> <ins class= "diff-new">attribute has absolutely no effect. It is basically a talisman. It is allowed merely to make migration to and from XHTML mildly easier. When parsed by an</ins> <a href= "#html-0"><ins class="diff-new">HTML parser</ins></a> ,<ins class= "diff-new">the attribute ends up in no namespace, not the "</ins> <code><ins class= "diff-new">http://www.w3.org/2000/xmlns/</ins></code> <ins class= "diff-new">" namespace like namespace declaration attributes in XML do.</ins> <ins class="diff-new">In XML, an</ins> <code title= ""><ins class="diff-new">xmlns</ins></code> <ins class= "diff-new">attribute is part of the namespace declaration mechanism, and an element cannot actually have an</ins> <code title=""><ins class="diff-new">xmlns</ins></code> <ins class= "diff-new">attribute in no namespace specified.</ins> <h4 id="the-id"><del class= "diff-old">3.4.1.</del> <ins class="diff-chg">3.4.1</ins> The <dfn id="id" title="attr-id"><code>id</code></dfn> attribute</h4> The <code title="attr-id"><a href="#id">id</a></code> attribute represents its element's unique identifier. The value must be unique in the subtree within which the element finds itself and must contain at least one character. The value must not contain any <a href="#space" title="space character">space characters</a> . If the value is not the empty string, user agents must associate the element with the given value (exactly, including any space characters) for the purposes of ID matching within the subtree the element finds itself (e.g. for selectors in CSS or for the <code>getElementById()</code> method in the DOM). Identifiers are opaque strings. Particular meanings should not be derived from the value of the <code title="attr-id"><a href= "#id">id</a></code> attribute. This specification doesn't preclude an element having multiple IDs, if other mechanisms (e.g. DOM Core methods) can set an element's ID in a way that doesn't conflict with the <code title= "attr-id"><a href="#id">id</a></code> attribute. The <dfn id="id0" title="dom-id"><code>id</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the <code title= "attr-id"><a href="#id">id</a></code> content attribute. <h4 id="the-title"><del class= "diff-old">3.4.2.</del> <ins class="diff-chg">3.4.2</ins> The <dfn id="title" title="attr-title"><code>title</code></dfn> attribute</h4> The <code title="attr-title"><a href="#title">title</a></code> attribute represents advisory information for the element, such as would be appropriate for a tooltip. On a link, this could be the title or a description of the target resource; on an image, it could be the image credit or a description of the image; on a paragraph, it could be a footnote or commentary on the text; on a citation, it could be further information about the source; and so forth. The value is text. If this attribute is omitted from an element, then it implies that the <code title="attr-title"><a href="#title">title</a></code> attribute of the nearest ancestor <a href="#html-elements" title= "HTML elements">HTML element</a> with a <code title= "attr-title"><a href="#title">title</a></code> attribute set is also relevant to this element. Setting the attribute overrides this, explicitly stating that the advisory information of any ancestors is not relevant to this element. Setting the attribute to the empty string indicates that the element has no advisory information. If the <code title="attr-title"><a href= "#title">title</a></code> attribute's value contains U+000A LINE FEED (LF) characters, the content is split into multiple lines. Each U+000A LINE FEED (LF) character represents a line break. Some elements, such as <code><a href="#link">link</a></code> and <code><del class="diff-old">dfn</del> <a href="#abbr"><ins class= "diff-chg">abbr</ins></a></code> , define additional semantics for the <code title="attr-title"><a href="#title">title</a></code> attribute beyond the semantics described above. The <dfn id="title0" title="dom-title"><code>title</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the <code title= "attr-title"><a href="#title">title</a></code> content attribute. <h4 id="the-lang"><del class= "diff-old">3.4.3.</del> <ins class="diff-chg">3.4.3</ins> The <dfn id="lang" title="attr-lang"><code>lang</code></dfn> (HTML only) and <dfn id="xmllang" title= "attr-xml-lang"><code>xml:lang</code></dfn> (XML only) attributes</h4> The <code title="attr-lang"><a href="#lang">lang</a></code> attribute specifies the primary <dfn id="language">language</dfn> for the element's contents and for any of the element's attributes that contain text. Its value must be a valid RFC 3066 language code, or the empty string. <a href="#references">[RFC3066]</a> The <code title="attr-xml-lang"><a href= "#xmllang">xml:lang</a></code> attribute is defined in XML. <a href="#references">[XML]</a> If these attributes are omitted from an element, then it implies that the language of this element is the same as the language of the parent element. Setting the attribute to the empty string indicates that the primary language is unknown. The <code title="attr-lang"><a href="#lang">lang</a></code> attribute may <del class="diff-old">only</del> be used on elements of <a href="#html-">HTML documents</a> . Authors must not use the <code title="attr-lang"><a href="#lang">lang</a></code> attribute in <a href="#xml-documents">XML documents</a> . The <code title="attr-xml-lang"><a href= "#xmllang">xml:lang</a></code> attribute may <del class= "diff-old">only</del> be used on elements of <a href= "#xml-documents">XML documents</a> . Authors must not use the <code title="attr-xml-lang"><a href="#xmllang">xml:lang</a></code> attribute in <a href="#html-">HTML documents</a> . To determine the language of a node, user agents must look at the nearest ancestor element (including the element itself if the node is an element) that has an <code title= "attr-xml-lang"><a href="#xmllang">xml:lang</a></code> attribute set or is an <a href="#html-elements" title="HTML elements">HTML element</a> and has a <code title="attr-lang"><a href= "#lang">lang</a></code> attribute set. That attribute specifies the language of the node. If both the <code title="attr-xml-lang"><a href= "#xmllang">xml:lang</a></code> attribute and the <code title= "attr-lang"><a href="#lang">lang</a></code> attribute are set on an element, user agents must use the <code title= "attr-xml-lang"><a href="#xmllang">xml:lang</a></code> attribute, and the <code title="attr-lang"><a href="#lang">lang</a></code> attribute must be <a href="#ignored" title="ignore">ignored</a> for the purposes of determining the element's language. If no explicit language is given for the <a href= "#root-element">root element</a> , then language information from a higher-level protocol (such as HTTP), if any, must be used as the final fallback language. In the absence of any language information, the default value is unknown (the empty string). User agents may use the element's language to determine proper processing or rendering (e.g. in the selection of appropriate fonts or <del class="diff-old">pronounciations,</del> <ins class= "diff-chg">pronunciations,</ins> or for dictionary selection). The <dfn id="lang0" title="dom-lang"><code>lang</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the <code title= "attr-lang"><a href="#lang">lang</a></code> content attribute. <h4 id="the-xmlbase"><ins class= "diff-new">3.4.4</ins> <ins class="diff-new">The</ins> <dfn id="xmlbase" title="attr-xml-base"><code><ins class= "diff-new">xml:base</ins></code></dfn> <ins class= "diff-new">attribute (XML only)</ins></h4> <ins class="diff-new">The</ins> <code title= "attr-xml-base"><a href="#xmlbase"><ins class= "diff-new">xml:base</ins></a></code> <ins class= "diff-new">attribute is defined in XML Base.</ins> <a href= "#references"><ins class="diff-new">[XMLBASE]</ins></a> <ins class="diff-new">The</ins> <code title= "attr-xml-base"><a href="#xmlbase"><ins class= "diff-new">xml:base</ins></a></code> <ins class= "diff-new">attribute may be used on elements of</ins> <a href= "#xml-documents"><ins class="diff-new">XML documents</ins></a> .<ins class="diff-new">Authors must not use the</ins> <code title= "attr-xml-base"><a href="#xmlbase"><ins class= "diff-new">xml:base</ins></a></code> <ins class= "diff-new">attribute in</ins> <a href="#html-"><ins class= "diff-new">HTML documents</ins></a> . <h4 id="the-dir"><del class= "diff-old">3.4.4.</del> <ins class="diff-chg">3.4.5</ins> The <dfn id="dir" title="attr-dir"><code>dir</code></dfn> attribute</h4> The <code title="attr-dir"><a href="#dir">dir</a></code> attribute specifies the element's text directionality. The attribute is an <a href="#enumerated">enumerated attribute</a> with the keyword <code title="">ltr</code> mapping to the state ltr , and the keyword <code title="">rtl</code> mapping to the state rtl . The attribute has no defaults. If the attribute has the state ltr , the element's directionality is left-to-right. If the attribute has the state rtl , the element's directionality is right-to-left. Otherwise, the element's directionality is the same as its <del class="diff-old">parent.</del> <ins class="diff-chg">parent element, or</ins> <ins class="diff-chg">ltr</ins> <ins class="diff-chg">if there is no parent element.</ins> The processing of this attribute depends on the presentation layer. For example, CSS 2.1 defines a mapping from this attribute to the CSS 'direction' and 'unicode-bidi' properties, and defines rendering in terms of those properties. The <dfn id="dir0" title="dom-dir"><code>dir</code></dfn> DOM attribute on an element must <a href="#reflect">reflect</a> the <code title="attr-dir"><a href="#dir">dir</a></code> content attribute of that element, <a href="#limited0">limited to only known values</a> . The <dfn id="dir1" title= "dom-document-dir"><code>dir</code></dfn> DOM attribute on <code><a href="#htmldocument">HTMLDocument</a></code> objects must <a href="#reflect">reflect</a> the <code title="attr-dir"><a href= "#dir">dir</a></code> content attribute of <a href="#the-html0">the <code>html</code> element</a> , if any, <a href="#limited0">limited to only known values</a> . If there is no such element, then the attribute must return the empty string and do nothing on setting. <h4 id="classes"><del class= "diff-old">3.4.5.</del> <ins class="diff-chg">3.4.6</ins> The <dfn id="class" title="attr-class"><code>class</code></dfn> attribute</h4> Every <a href="#html-elements" title="HTML elements">HTML element</a> may have a <code title="attr-class"><a href= "#class">class</a></code> attribute specified. The attribute, if specified, must have a value that is an <a href="#unordered">unordered set of unique space-separated tokens</a> representing the various classes that the element belongs to. The classes that an <a href="#html-elements" title= "HTML elements">HTML element</a> has assigned to it consists of all the classes returned when the value of the <code title= "attr-class"><a href="#class">class</a></code> attribute is <a href="#split" title="split a string on spaces">split on spaces</a> . Assigning classes to an element affects class matching in selectors in CSS, the <code title= "dom-document-getElementsByClassName"><a href= "#getelementsbyclassname">getElementsByClassName()</a></code> method in the DOM, and other such features. Authors may use any value in the <code title= "attr-class"><a href="#class">class</a></code> attribute, but are encouraged to use the values that describe the nature of the content, rather than values that describe the desired presentation of the content. The <dfn id="classname" title= "dom-className"><code>className</code></dfn> and <dfn id= "classlist" title="dom-classList"><code>classList</code></dfn> DOM attributes must both <a href="#reflect">reflect</a> the <code title="attr-class"><a href="#class">class</a></code> content attribute. <h4 id="the-irrelevant"><del class= "diff-old">3.4.6.</del> <ins class="diff-chg">3.4.7</ins> The <dfn id="irrelevant" title= "attr-irrelevant"><code>irrelevant</code></dfn> attribute</h4> All elements may have the <code title="attr-irrelevant"><a href= "#irrelevant">irrelevant</a></code> content attribute set. The <code title="attr-irrelevant"><a href= "#irrelevant">irrelevant</a></code> attribute is a <a href= "#boolean0">boolean attribute</a> . When specified on an element, it indicates that the element is not yet, or is no longer, relevant. User agents should not render elements that have the <code title="attr-irrelevant"><a href= "#irrelevant">irrelevant</a></code> attribute specified. <div class="example"> In the following skeletal example, the attribute is used to hide the Web game's main screen until the user logs in: <pre> <h1>The Example Game</h1> <section id="login"> <h2>Login</h2> <form> ... <!-- calls login() once the user's credentials have been checked --> </form> <script> function login() { // switch screens document.getElementById('login').irrelevant = true; document.getElementById('game').irrelevant = false; } </script> </section> <section id="game" irrelevant> ... </section> </pre></div> The <code title="attr-irrelevant"><a href= "#irrelevant">irrelevant</a></code> attribute must not be used to hide content that could legitimately be shown in another presentation. For example, it is incorrect to use <code title= "attr-irrelevant"><a href="#irrelevant">irrelevant</a></code> to hide panels in a tabbed dialog, because the tabbed interface is merely a kind of overflow presentation — showing all the form controls in one big page with a scrollbar would be equivalent, and no less correct. Elements in a section hidden by the <code title= "attr-irrelevant"><a href="#irrelevant">irrelevant</a></code> attribute are still active, e.g. scripts and form controls in such sections still render execute and submit respectively. Only their presentation to the user changes. The <dfn id="irrelevant0" title= "dom-irrelevant"><code>irrelevant</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the content attribute of the same name. <h4 id="the-style"><ins class= "diff-new">3.4.8</ins> <ins class="diff-new">The</ins> <dfn id="style" title="attr-style"><code><ins class= "diff-new">style</ins></code></dfn> <ins class= "diff-new">attribute</ins></h4> <ins class="diff-new">All elements may have the</ins> <code title="attr-style"><a href="#style"><ins class= "diff-new">style</ins></a></code> <ins class="diff-new">content attribute set. If specified, the attribute must contain only a list of zero or more semicolon-separated (;) CSS declarations.</ins> <a href="#references"><ins class="diff-new">[CSS21]</ins></a> <ins class="diff-new">The attribute, if specified, must be parsed and treated as the body (the part inside the curly brackets) of a declaration block in a rule whose selector matches just the element on which the attribute is set. For the purposes of the CSS cascade, the attribute must be considered to be a 'style' attribute at the author level.</ins> <ins class="diff-new">Documents that use</ins> <code title= "attr-style"><a href="#style"><ins class= "diff-new">style</ins></a></code> <ins class="diff-new">attributes on any of their elements must still be comprehensible and usable if those attributes were removed.</ins> <ins class="diff-new">In particular, using the</ins> <code title="attr-style"><a href="#style"><ins class= "diff-new">style</ins></a></code> <ins class="diff-new">attribute to hide and show content, or to convey meaning that is otherwise not included in the document, is non-conforming.</ins> <ins class="diff-new">The</ins> <dfn id="style0" title= "dom-style"><code><ins class="diff-new">style</ins></code></dfn> <ins class="diff-new">DOM attribute must return a</ins> <code><ins class="diff-new">CSSStyleDeclaration</ins></code> <ins class="diff-new">whose value represents the declarations specified in the attribute, if present. Mutating the</ins> <code><ins class="diff-new">CSSStyleDeclaration</ins></code> <ins class="diff-new">object must create a</ins> <code title= "attr-font-style"><ins class="diff-new">style</ins></code> <ins class="diff-new">attribute on the element (if there isn't one already) and then change its value to be a value representing the serialized form of the</ins> <code><ins class= "diff-new">CSSStyleDeclaration</ins></code> <ins class= "diff-new">object.</ins> <a href="#references"><ins class= "diff-new">[CSSOM]</ins></a> <div class="example"> <ins class="diff-new">In the following example, the words that refer to colors are marked up using the</ins> <code><a href= "#span"><ins class="diff-new">span</ins></a></code> <ins class= "diff-new">element and the</ins> <code title="attr-style"><a href= "#style"><ins class="diff-new">style</ins></a></code> <ins class= "diff-new">attribute to make those words show up in the relevant colors in visual media.</ins> <pre> <p>My sweat suit is <span style="color: green; background:<ins class="diff-new"> transparent">green and my eyes are <span style="color: blue; background: transparent"> blue. </ins> </pre></div> <h4 id="embedding"><ins class= "diff-new">3.4.9</ins> <dfn id="embedding0"><ins class= "diff-new">Embedding custom non-visible data</ins></dfn></h4> <ins class="diff-new">A</ins> <dfn id="custom"><ins class= "diff-new">custom data attribute</ins></dfn> <ins class= "diff-new">is an attribute whose name starts with the string "</ins> <dfn id="data-" title="attr-data-*"><code><ins class= "diff-new">data-</ins></code></dfn> <ins class="diff-new">" and has at least one character after the hyphen.</ins> <a href="#custom" title="custom data attribute"><ins class= "diff-new">Custom data attributes</ins></a> <ins class= "diff-new">are intended to store custom data private to the page or application, for which there are no more appropriate attributes or elements.</ins> <ins class="diff-new">Every</ins> <a href="#html-elements" title="HTML elements"><ins class="diff-new">HTML element</ins></a> <ins class="diff-new">may have any number of</ins> <a href= "#custom" title="custom data attribute"><ins class= "diff-new">custom data attributes</ins></a> <ins class= "diff-new">specified, with any value.</ins> <ins class="diff-new">The</ins> <dfn id="dataset" title= "dom-dataset"><code><ins class= "diff-new">dataset</ins></code></dfn> <ins class="diff-new">DOM attribute provides convenient accessors for all the</ins> <code title="attr-data-*"><a href="#data-"><ins class= "diff-new">data-*</ins></a></code> <ins class="diff-new">attributes on an element. On getting, the</ins> <code title= "dom-dataset"><a href="#dataset"><ins class= "diff-new">dataset</ins></a></code> <ins class="diff-new">DOM attribute must return a</ins> <code><a href= "#domstringmap0"><ins class= "diff-new">DOMStringMap</ins></a></code> <ins class= "diff-new">object, associated with the following three algorithms, which expose these attributes on their element:</ins> <dl> <dt><ins class="diff-new">The algorithm for getting values from names</ins></dt> <dd> <ol> <li><ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">name</ins></var> <ins class="diff-new">be the concatenation of the string</ins> <code title=""><ins class= "diff-new">data-</ins></code> <ins class="diff-new">and the name passed to the algorithm.</ins></li> <li><ins class="diff-new">If the element does not have an attribute with the name</ins> <var title=""><ins class= "diff-new">name</ins></var> ,<ins class="diff-new">then the name has no corresponding value, abort.</ins></li> <li><ins class="diff-new">Otherwise, return the value of the attribute with the name</ins> <var title=""><ins class= "diff-new">name</ins></var> .</li> </ol> </dd> <dt><ins class="diff-new">The algorithm for setting names to certain values</ins></dt> <dd> <ol> <li><ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">name</ins></var> <ins class="diff-new">be the concatenation of the string</ins> <code title=""><ins class= "diff-new">data-</ins></code> <ins class="diff-new">and the name passed to the algorithm.</ins></li> <li><ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">value</ins></var> <ins class="diff-new">be the value passed to the algorithm.</ins></li> <li><ins class="diff-new">Set the value of the attribute with the name</ins> <var title=""><ins class="diff-new">name</ins></var> ,<ins class="diff-new">to the value</ins> <var title=""><ins class= "diff-new">value</ins></var> ,<ins class="diff-new">replacing any previous value if the attribute already existed. If</ins> <code title=""><ins class="diff-new">setAttribute()</ins></code> <ins class="diff-new">would have raised an exception when setting an attribute with the name</ins> <var title=""><ins class= "diff-new">name</ins></var> ,<ins class="diff-new">then this must raise the same exception.</ins></li> </ol> </dd> <dt><ins class="diff-new">The algorithm for deleting names</ins></dt> <dd> <ol> <li><ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">name</ins></var> <ins class="diff-new">be the concatenation of the string</ins> <code title=""><ins class= "diff-new">data-</ins></code> <ins class="diff-new">and the name passed to the algorithm.</ins></li> <li><ins class="diff-new">Remove the attribute with the name</ins> <var title=""><ins class="diff-new">name</ins></var> ,<ins class= "diff-new">if such an attribute exists. Do nothing otherwise.</ins></li> </ol> </dd> </dl> <div class="example"> <ins class="diff-new">If a Web page wanted an element to represent a space ship, e.g. as part of a game, it would have to use the</ins> <code class="attr-class"><ins class= "diff-new">class</ins></code> <ins class="diff-new">attribute along with</ins> <code title="attr-data-*"><a href="#data-"><ins class= "diff-new">data-*</ins></a></code> <ins class= "diff-new">attributes:</ins> <pre> <ins class="diff-new"> <div class="spaceship" data-id="92432" data-weapons="laser 2" data-shields="50%" data-x="30" data-y="10" data-z="90"> <button class="fire" onclick="spaceships[this.parentNode.dataset.id].fire()"> Fire </button> </div> </ins> </pre></div> <ins class="diff-new">Authors should carefully design such extensions so that when the attributes are ignored and any associated CSS dropped, the page is still usable.</ins> <ins class="diff-new">User agents must not derive any implementation behavior from these attributes or values. Specifications intended for user agents must not define these attributes to have any meaningful values.</ins> <h3 id="interaction"><del class= "diff-old">3.5.</del> <ins class="diff-chg">3.5</ins> <dfn id="interaction0">Interaction</dfn></h3> <h4 id="activation"><del class= "diff-old">3.5.1.</del> <ins class="diff-chg">3.5.1</ins> Activation</h4> The <dfn id="click" title="dom-click">click()</dfn> method must <a href="#firing">fire a <code>click</code> event</a> at the element, whose default action is the firing of a further <code title= "event-DOMActivate">DOMActivate</code> event at the same element, whose own default action is to go through all the elements the <code title="event-DOMActivate">DOMActivate</code> event bubbled through (starting at the target node and going towards the <code>Document</code> node), looking for an element with an <a href="#activation0">activation behavior</a> ; the first element, in reverse tree order, to have one, must have its activation behavior executed. <h4 id="focus"><del class= "diff-old">3.5.2.</del> <ins class="diff-chg">3.5.2</ins> Focus</h4> When an element is focused , key events received by the document must be targeted at that element. There <del class= "diff-old">is always an</del> <ins class="diff-chg">may be no</ins> element focused; <del class="diff-old">in the absence of other elements being</del> <ins class="diff-chg">when no element is</ins> focused, <ins class="diff-new">key events received by</ins> the <del class="diff-old">document's root</del> <ins class= "diff-chg">document must be targetted at</ins> <a href= "#the-body1"><ins class="diff-chg">the</ins> <code><ins class= "diff-chg">body</ins></code> element <del class="diff-old">is it.</del></a> . <ins class="diff-chg">User agents may track focus for each</ins> <a href="#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">or</ins> <code><ins class= "diff-chg">Document</ins></code> <ins class= "diff-chg">individually, or may support only one focused elment per</ins> <a href="#top-level"><ins class="diff-chg">top-level browsing context</ins></a> <ins class="diff-chg">— user agents should follow platform conventions in this regard.</ins> Which <del class="diff-old">element</del> <ins class= "diff-chg">element(s)</ins> within a <del class= "diff-old">document</del> <a href="#top-level"><ins class= "diff-chg">top-level browsing context</ins></a> currently has focus <del class="diff-old">is</del> <ins class="diff-chg">must be</ins> independent of whether or not the <del class= "diff-old">document</del> <a href="#top-level"><ins class= "diff-chg">top-level browsing context</ins></a> itself has the system focus . <del class="diff-old">Some focusable elements might take part in sequential focus navigation .</del> <h5 id="focus-management">3.5.2.1. Focus management</h5> The <del class="diff-old">focus() and blur()</del> <dfn id= "focusing"><ins class="diff-chg">focusing steps</ins></dfn> <del class="diff-old">methods must</del> <ins class="diff-chg">are as follows:</ins> <ol> <li> <ins class="diff-chg">If focusing the element will remove the</ins> focus <del class="diff-old">and unfocus</del> <ins class= "diff-chg">from another element, then run the</ins> <a href= "#unfocusing"><ins class="diff-chg">unfocusing steps</ins></a> <ins class="diff-chg">for that element.</ins> </li> <li> <ins class="diff-chg">Make</ins> the element <del class= "diff-old">respectively, if</del> the <ins class= "diff-new">currently focused</ins> element <del class="diff-old">is focusable.</del> <ins class="diff-chg">in its</ins> <a href= "#top-level"><ins class="diff-chg">top-level browsing context</ins></a> . Some elements, most notably <code><a href= "#area">area</a></code> , can correspond to more than one distinct focusable area. <del class="diff-old">When such an</del> <ins class="diff-chg">If a particular area was indicated when the</ins> element <ins class="diff-new">was focused, then that</ins> is <del class="diff-old">focused</del> <ins class= "diff-chg">the area that must get focus; otherwise, e.g. when</ins> using the <code title="dom-focus"><a href= "#focus0">focus()</a></code> method, the first such region in tree order is the one that must be focused. <del class= "diff-old">Well</del> </li> <li> <a href="#firing2"><ins class="diff-chg">Fire a simple event</ins></a> that <del class="diff-old">clearly needs more.</del> <ins class="diff-chg">doesn't bubble called</ins> <code title="event-focus"><ins class="diff-chg">focus</ins></code> <ins class="diff-chg">at the element.</ins> </li> </ol> <ins class="diff-chg">User agents must run the</ins> <a href= "#focusing"><ins class="diff-chg">focusing steps</ins></a> <ins class="diff-chg">for an element whenever the user moves the focus to a</ins> <a href="#focusable"><ins class= "diff-chg">focusable</ins></a> <ins class= "diff-chg">element.</ins> <ins class="diff-chg">The</ins> <dfn id="unfocusing"><ins class= "diff-chg">unfocusing steps</ins></dfn> <ins class="diff-chg">are as follows:</ins> <ol> <li> <ins class="diff-chg">Unfocus the element.</ins> </li> <li> <a href="#firing2"><ins class="diff-chg">Fire a simple event</ins></a> <ins class="diff-chg">that doesn't bubble called</ins> <code title="event-blur"><ins class= "diff-chg">blur</ins></code> <ins class="diff-chg">at the element.</ins> </li> </ol> <ins class="diff-chg">User agents should run the</ins> <a href= "#unfocusing"><ins class="diff-chg">unfocusing steps</ins></a> <ins class="diff-chg">for an element whenever the user moves the focus away from any</ins> <a href="#focusable"><ins class= "diff-chg">focusable</ins></a> <ins class= "diff-chg">element.</ins> <hr> <ins class="diff-chg">The</ins> <dfn id="focus0" title= "dom-focus"><code><ins class="diff-chg">focus()</ins></code></dfn> <ins class="diff-chg">method, when invoked, must run the following algorithm:</ins> <ol> <li> <ins class="diff-chg">If the element is marked as</ins> <a href="#locked"><ins class="diff-chg">locked for focus</ins></a> ,<ins class="diff-chg">then abort these steps.</ins> </li> <li> <ins class="diff-chg">If the element is not</ins> <a href= "#focusable"><ins class="diff-chg">focusable</ins></a> ,<ins class= "diff-chg">then abort these steps.</ins> </li> <li> <ins class="diff-chg">Mark the element as</ins> <dfn id= "locked"><ins class="diff-chg">locked for focus</ins></dfn> . </li> <li> <ins class="diff-chg">If the element is not already focused, run the</ins> <a href="#focusing"><ins class="diff-chg">focusing steps</ins></a> <ins class="diff-chg">for the element.</ins> </li> <li> <ins class="diff-chg">Unmark the element as</ins> <a href= "#locked"><ins class="diff-chg">locked for focus</ins></a> . </li> </ol> <ins class="diff-chg">The</ins> <dfn id="blur" title= "dom-blur"><code><ins class="diff-chg">blur()</ins></code></dfn> <ins class="diff-chg">method, when invoked, should run the</ins> <a href="#unfocusing"><ins class="diff-chg">unfocusing steps</ins></a> <ins class="diff-chg">for the element. User agents may selectively or uniformly ignore calls to this method for usability reasons.</ins> <hr> The <dfn id="activeelement" title= "dom-document-activeElement"><code>activeElement</code></dfn> attribute must return the element in the document that <del class= "diff-old">has focus.</del> <ins class="diff-chg">is focused.</ins> If no element <del class="diff-old">specifically has focus,</del> <ins class="diff-chg">in the</ins> <code><ins class= "diff-chg">Document</ins></code> <ins class="diff-chg">is focused,</ins> this must return <a href="#the-body1">the <code>body</code> element</a> . The <dfn id="hasfocus" title= "dom-document-hasFocus"><code><del class="diff-old">hasFocus</del> <ins class="diff-chg">hasFocus()</ins></code></dfn> <del class= "diff-old">attribute</del> <ins class="diff-chg">method</ins> must return true if the document, one of its nested <a href="#browsing1" title="browsing context">browsing contexts</a> , or any element in the document or its browsing contexts currently has the system focus. <h5 id="sequential">3.5.2.2. Sequential focus navigation</h5> <del class="diff-old">This section on the tabindex attribute needs to be checked for backwards-compatibility.</del> The <dfn id="tabindex" title= "attr-tabindex"><code>tabindex</code></dfn> <ins class= "diff-new">content</ins> attribute specifies <ins class= "diff-new">whether the element is focusable, whether it can be reached using sequential focus navigation, and</ins> the relative order of <del class="diff-old">elements</del> <ins class= "diff-chg">the element</ins> for the purposes of sequential focus navigation. The name "tab index" comes from the common use of the "tab" key to navigate through the focusable elements. The term "tabbing" refers to moving forward through the focusable <del class="diff-old">elements.</del> <ins class= "diff-chg">elements that can be reached using sequential focus navigation.</ins> The <code title="attr-tabindex"><a href= "#tabindex">tabindex</a></code> attribute, if specified, must have a value that is a <a href="#valid0">valid integer</a> . If the attribute is specified, it must be parsed using the <a href="#rules0">rules for parsing integers</a> . <ins class= "diff-new">The attribute's values have the following meanings:</ins> <dl> <dt>If <ins class="diff-new">the attribute is omitted or</ins> parsing the value returns an <del class="diff-old">error,</del> <ins class="diff-chg">error</ins></dt> <dd> <ins class="diff-chg">The user agent should follow platform conventions to determine if</ins> the <del class= "diff-old">attribute</del> <ins class="diff-chg">element</ins> is <del class="diff-old">ignored for the purposes of focus management (as</del> <ins class="diff-chg">to be focusable and,</ins> if <del class="diff-old">it wasn't specified). A positive integer or zero specifies the index of</del> <ins class="diff-chg">so, whether</ins> the element <del class="diff-old">in the current scope's tab order. Elements with the same index are sorted in tree</del> <ins class="diff-chg">can be reached using sequential focus navigation, and if so, what its relative</ins> order <del class="diff-old">for</del> <ins class="diff-chg">should be.</ins> </dd> <dt id="negative-tabindex"><ins class="diff-chg">If</ins> the <del class="diff-old">purposes of tabbing. A</del> <ins class= "diff-chg">value is a</ins> negative integer <del class= "diff-old">specifies that</del></dt> <dd> <ins class="diff-chg">The user agent must allow</ins> the element <del class="diff-old">should</del> <ins class= "diff-chg">to</ins> be <del class="diff-old">removed from the tab order. If</del> <ins class="diff-chg">focused, but should not allow</ins> the element <del class="diff-old">does normally take focus, it may still</del> <ins class="diff-chg">to</ins> be <del class="diff-old">focused</del> <ins class= "diff-chg">reached</ins> using <del class="diff-old">other means (e.g. it could be focused by a click).</del> <ins class= "diff-chg">sequential focus navigation.</ins> </dd> <dt>If the <del class="diff-old">attribute</del> <ins class= "diff-chg">value</ins> is <del class="diff-old">absent (or invalid), then the</del> <ins class="diff-chg">a zero</ins></dt> <dd> <ins class="diff-chg">The</ins> user agent must <del class= "diff-old">treat</del> <ins class="diff-chg">allow</ins> the element <del class="diff-old">as if it had</del> <ins class= "diff-chg">to be focused, should allow</ins> the <del class= "diff-old">value 0 or</del> <ins class="diff-chg">element to be reached using sequential focus navigation, and should follow platform conventions to determine the element's relative order.</ins> </dd> <dt><ins class="diff-chg">If</ins> the value <del class= "diff-old">-1, based on platform conventions. For example, a</del> <ins class="diff-chg">is greater than zero</ins></dt> <dd> <ins class="diff-chg">The</ins> user agent <del class= "diff-old">might default textarea elements</del> <ins class= "diff-chg">must allow the element</ins> to <del class= "diff-old">0,</del> <ins class="diff-chg">be focused, should allow the element to be reached using sequential focus navigation,</ins> and <del class="diff-old">button</del> <ins class="diff-chg">should place the element in the sequential focus navigation order so that it is:</ins> <ul> <li><ins class="diff-chg">before any focusable element whose</ins> <code title="attr-tabindex"><a href="#tabindex"><ins class= "diff-chg">tabindex</ins></a></code> <del class= "diff-old">elements</del> <ins class="diff-chg">attribute has been omitted or whose value, when parsed, returns an error,</ins></li> <li><ins class="diff-chg">before any focusable element whose</ins> <code title="attr-tabindex"><a href="#tabindex"><ins class= "diff-chg">tabindex</ins></a></code> <ins class= "diff-chg">attribute has a value equal</ins> to <del class= "diff-old">-1, making text fields part</del> <ins class= "diff-chg">or less than zero,</ins></li> <li><ins class="diff-chg">after any element whose</ins> <code title="attr-tabindex"><a href="#tabindex"><ins class= "diff-chg">tabindex</ins></a></code> <ins class= "diff-chg">attribute has a value greater than zero but less than the value</ins> of the <del class="diff-old">tabbing cycle but buttons not. When an</del> <code title="attr-tabindex"><a href= "#tabindex"><ins class="diff-chg">tabindex</ins></a></code> <ins class="diff-chg">attribute on the element,</ins></li> <li><ins class="diff-chg">after any</ins> element <del class= "diff-old">that does not normally take focus (i.e.</del> whose <del class="diff-old">default value would be -1)</del> <code title= "attr-tabindex"><a href="#tabindex"><ins class= "diff-chg">tabindex</ins></a></code> <ins class= "diff-chg">attribute</ins> has <ins class="diff-new">a value equal to the value of</ins> the <code title="attr-tabindex"><a href= "#tabindex">tabindex</a></code> attribute <del class= "diff-old">specified with</del> <ins class="diff-chg">on the element but that is earlier in the document in</ins> <a href= "#tree-order"><ins class="diff-chg">tree order</ins></a> <ins class="diff-chg">than the element,</ins></li> <li><ins class="diff-chg">before any element whose</ins> <code title="attr-tabindex"><a href="#tabindex"><ins class= "diff-chg">tabindex</ins></a></code> <ins class= "diff-chg">attribute has</ins> a <del class="diff-old">positive value, then it should be added</del> <ins class="diff-chg">value equal</ins> to the <del class="diff-old">tab</del> <ins class= "diff-chg">value of the</ins> <code title="attr-tabindex"><a href= "#tabindex"><ins class="diff-chg">tabindex</ins></a></code> <ins class="diff-chg">attribute on the element but that is later in the document in</ins> <a href="#tree-order"><ins class= "diff-chg">tree</ins> order</a> <ins class="diff-new">than the element,</ins> and <del class="diff-old">should</del></li> <li><ins class="diff-chg">before any element whose</ins> <code title="attr-tabindex"><a href="#tabindex"><ins class= "diff-chg">tabindex</ins></a></code> <ins class= "diff-chg">attribute has a value greater than the value of the</ins> <code title="attr-tabindex"><a href= "#tabindex"><ins class="diff-chg">tabindex</ins></a></code> <ins class="diff-chg">attribute on the element.</ins></li> </ul> </dd> </dl> <ins class="diff-chg">An element is</ins> <dfn id= "focusable"><ins class="diff-chg">focusable</ins></dfn> <ins class= "diff-chg">if the</ins> <code title="attr-tabindex"><a href= "#tabindex"><ins class="diff-chg">tabindex</ins></a></code> <ins class="diff-chg">attribute's definition above defines the element to</ins> be <del class="diff-old">made focusable.</del> <ins class="diff-chg">focusable</ins> <ins class= "diff-chg">and</ins> <ins class="diff-chg">the element is</ins> <ins class="diff-chg">being rendered</ins> <ins class="diff-chg">.</ins> When <ins class="diff-new">an element is</ins> focused, the element matches the CSS <code>:focus</code> pseudo-class and key events are dispatched on that element in response to keyboard input. The <dfn id="tabindex0" title= "dom-tabIndex"><code>tabIndex</code></dfn> DOM attribute <del class="diff-old">reflects</del> <ins class= "diff-chg">must</ins> <a href="#reflect"><ins class= "diff-chg">reflect</ins></a> the value of the <code title= "attr-tabIndex"><a href="#tabindex">tabIndex</a></code> content attribute. If the attribute is not <del class="diff-old">present (or has</del> <ins class="diff-chg">present, or parsing its value returns</ins> an <del class="diff-old">invalid value)</del> <ins class="diff-chg">error,</ins> then the DOM attribute must return <del class="diff-old">the UA's default value for that element, which will be either</del> 0 <del class= "diff-old">(for</del> <ins class="diff-chg">for</ins> elements <del class="diff-old">in the tab order) or -1 (for</del> <ins class="diff-chg">that are focusable and −1 for</ins> elements <ins class="diff-new">that are</ins> not <del class="diff-old">in the tab order).</del> <ins class="diff-chg">focusable.</ins> <h4 id="scrolling"><del class= "diff-old">3.5.3.</del> <ins class="diff-chg">3.5.3</ins> Scrolling elements into view</h4> The <dfn id="scrollintoview" title= "dom-scrollIntoView"><code>scrollIntoView([ <var title="">top</var> ])</code></dfn> method, when called, must cause the element on which the method was called to have the attention of the user called to it. In a speech browser, this could happen by having the current playback position move to the start of the given element. In visual user agents, if the argument is present and has the value false, the user agent should scroll the element into view such that both the bottom and the top of the element are in the viewport, with the bottom of the element aligned with the bottom of the viewport. If it isn't possible to show the entire element in that way, or if the argument is omitted or is true, then the user agent <del class="diff-old">must</del> <ins class= "diff-chg">should</ins> instead <del class="diff-old">simply</del> align the top of the element with the top of the viewport. <ins class="diff-new">Visual user agents should further scroll horizontally as necessary to bring the element to the attention of the user.</ins> Non-visual user agents may ignore the argument, or may treat it in some media-specific manner most useful to the user. <h3 id="the-root"><del class= "diff-old">3.6.</del> <ins class="diff-chg">3.6</ins> The root element</h3> <h4 id="the-html"><del class= "diff-old">3.6.1.</del> <ins class="diff-chg">3.6.1</ins> The <dfn id="html"><code>html</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As the root element of a document.</dd> <dd>Wherever a subdocument fragment is allowed in a compound document.</dd> <dt>Content model:</dt> <dd>A <code><a href="#head">head</a></code> element followed by a <code><a href="#body0">body</a></code> element.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-html-manifest"><a href= "#manifest">manifest</a></code></dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#html">html</a></code> element represents the root of an HTML document. The <dfn id="manifest" title= "attr-html-manifest"><code>manifest</code></dfn> attribute gives the address of the document's <a href="#application0">application cache</a> <a href="#the-manifest" title= "concept-appcache-manifest">manifest</a> , if there is one. If the attribute is present, the attribute's value must be a valid URI (or IRI). The <code title="attr-html-manifest"><a href= "#manifest">manifest</a></code> attribute only <a href= "#application2" title="concept-appcache-init-with-attribute">has an effect</a> during the early stages of document load. Changing the attribute dynamically thus has no effect (and thus, no DOM API is provided for this attribute). <del class="diff-old">Furthermore, as it is processed before any</del> <ins class="diff-chg">Later</ins> <code><a href= "#base">base</a></code> elements <del class="diff-old">are seen, its value is not subject to being made relative to any base URI. Though it has absolutely no effect and no meaning,</del> <ins class="diff-chg">can't affect</ins> the <ins class= "diff-chg">resolving of relative URIs in</ins> <code title= "attr-html-manifest"><del class="diff-old">html</del> <a href= "#manifest"><ins class="diff-chg">manifest</ins></a></code> <del class="diff-old">element, in HTML documents , may have an xmlns attribute specified, if, and only if, it has the exact value " http://www.w3.org/1999/xhtml ". This does not apply to XML documents . In HTML, the xmlns attribute has absolutely no effect. It is basically a talisman. It is allowed merely to make migration to and from XHTML mildly easier. When parsed by an HTML parser , the attribute ends up in the null namespace, not</del> <ins class= "diff-chg">attributes, as</ins> the <del class="diff-old">" http://www.w3.org/2000/xmlns/ " namespace like namespace declaration</del> attributes <del class="diff-old">in XML do. In XML, an xmlns attribute is part of the namespace declaration mechanism, and an element cannot actually have an xmlns attribute in the null namespace specified.</del> <ins class="diff-chg">are processed before those elements are seen.</ins> <h3 id="document"><del class= "diff-old">3.7.</del> <ins class="diff-chg">3.7</ins> Document metadata</h3> <h4 id="the-head"><del class= "diff-old">3.7.1.</del> <ins class="diff-chg">3.7.1</ins> The <dfn id="head"><code>head</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As the first element in an <code><a href= "#html">html</a></code> element.</dd> <dt>Content model:</dt> <dd>One or more elements of <a href="#metadata0">metadata content</a> , of which exactly one is a <code><a href= "#title1">title</a></code> element.</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#head">head</a></code> element collects the document's metadata. <h4 id="the-title0"><del class= "diff-old">3.7.2.</del> <ins class="diff-chg">3.7.2</ins> The <dfn id="title1"><code>title</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#metadata0">Metadata content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>In a <code><a href="#head">head</a></code> element containing no other <code><a href="#title1">title</a></code> elements.</dd> <dt>Content model:</dt> <dd>Text.</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#title1">title</a></code> element represents the document's title or name. Authors should use titles that identify their documents even when they are used out of context, for example in a user's history or bookmarks, or in search results. The document's title is often different from its first header, since the first header does not have to stand alone when taken out of context. There must be no more than one <code><a href= "#title1">title</a></code> element per document. The <code><a href="#title1">title</a></code> element must not contain any elements. <div class="example"> Here are some examples of appropriate titles, contrasted with the top-level headers that might be used on those same pages. <pre> <title>Introduction to The Mating Rituals of Bees</title> ... <h1>Introduction</h1> <p>This companion guide to the highly successful <cite>Introduction to Medieval Bee-Keeping</cite> book is... </pre> The next page might be a part of the same site. Note how the title describes the subject matter unambiguously, while the first header assumes the reader knowns what the context is and therefore won't wonder if the dances are Salsa or Waltz: <pre> <title>Dances used during bee mating rituals</title> ... <h1> The Dances</h1> </pre></div> The string to use as the document's title is given by the <code title="dom-document-title"><a href= "#document.title">document.title</a></code> DOM attribute. User agents should use the document's title when referring to the document in their user interface. <h4 id="the-base"><del class= "diff-old">3.7.3.</del> <ins class="diff-chg">3.7.3</ins> The <dfn id="base"><code>base</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#metadata0">Metadata content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>In a <code><a href="#head">head</a></code> element containing no other <code><a href="#base">base</a></code> elements.</dd> <dt>Content model:</dt> <dd>Empty.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-base-href"><a href= "#href">href</a></code></dd> <dd><code title="attr-base-target"><a href= "#target">target</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlbaseelement">HTMLBaseElement</dfn> : <a href="#htmlelement">HTMLElement</a> { attribute DOMString <a href="#href0" title= "dom-base-href">href</a>; attribute DOMString <a href="#target0" title= "dom-base-target">target</a>; }; </pre></dd> </dl> The <code><a href="#base">base</a></code> element allows authors to specify the document's base URI for the purposes of resolving relative URIs, and the name of the default <a href= "#browsing1">browsing context</a> for the purposes of <a href= "#following0">following hyperlinks</a> . There must be no more than one <code><a href= "#base">base</a></code> element per document. A <code><a href="#base">base</a></code> element must have either an <code title="attr-base-href"><a href="#href">href</a></code> attribute, a <code title="attr-base-target"><a href= "#target">target</a></code> attribute, or both. The <dfn id="href" title= "attr-base-href"><code>href</code></dfn> content attribute, if specified, must contain a URI (or IRI). A <code><a href="#base">base</a></code> element, if it has an <code title="attr-base-href"><a href="#href">href</a></code> attribute, must come before any other elements in the tree that have attributes with URIs (except the <code><a href= "#html">html</a></code> element and its <code title= "attr-html-manifest"><a href="#manifest">manifest</a></code> attribute). User agents must use the value of the <code title= "att-base-href">href</code> attribute of the first <code><a href= "#base">base</a></code> element that is both a child of <a href= "#the-head0">the <code>head</code> element</a> and has an <code title="att-base-href">href</code> attribute, if there is such an element, as the document entity's base URI for the purposes of section 5.1.1 of RFC 3986 ("Establishing a Base URI": "Base URI Embedded in Content"). This base URI from RFC 3986 is referred to by the algorithm given in XML Base, which <a href="#xmlBase">is a normative part of this specification</a> . <a href= "#references">[RFC3986]</a> If the base URI given by this attribute is a relative URI, it must be resolved relative to the higher-level base URIs (i.e. the base URI from the encapsulating entity or the URI used to retrieve the entity) to obtain an absolute base URI. All <code title= "attr-xml-base"><a href="#xmlbase">xml:base</a></code> attributes must be ignored when resolving relative URIs in this <code title= "attr-base-href"><a href="#href">href</a></code> attribute. If there are multiple <code><a href= "#base">base</a></code> elements with <code title= "att-base-href">href</code> attributes, all but the first are ignored. The <dfn id="target" title= "attr-base-target"><code>target</code></dfn> attribute, if specified, must contain a <a href="#valid9">valid browsing context name <ins class="diff-new">or keyword</ins></a> . User agents use this name when <a href="#following0">following hyperlinks</a> . A <code><a href="#base">base</a></code> element, if it has a <code title="attr-base-target"><a href="#target">target</a></code> attribute, must come before any elements in the tree that represent <a href="#hyperlinks" title="hyperlink">hyperlinks</a> . The <dfn id="href0" title= "dom-base-href"><code>href</code></dfn> and <dfn id="target0" title="dom-base-target"><code>target</code></dfn> DOM attributes must <a href="#reflect">reflect</a> the content attributes of the same name. <h4 id="the-link"><del class= "diff-old">3.7.4.</del> <ins class="diff-chg">3.7.4</ins> The <dfn id="link"><code>link</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#metadata0">Metadata content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#metadata0">metadata content</a> is expected.</dd> <dd>In a <code><a href="#noscript">noscript</a></code> element that is a child of a <code><a href="#head">head</a></code> element.</dd> <dt>Content model:</dt> <dd>Empty.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-link-href"><a href= "#href1">href</a></code></dd> <dd><code title="attr-link-rel"><a href="#rel">rel</a></code></dd> <dd><code title="attr-link-media"><a href= "#media0">media</a></code></dd> <dd><code title="attr-link-hreflang"><a href= "#hreflang">hreflang</a></code></dd> <dd><code title="attr-link-type"><a href= "#type">type</a></code></dd> <dd><code title="attr-link-sizes"><a href="#sizes0"><ins class= "diff-new">sizes</ins></a></code></dd> <dd>Also, the <code title="attr-link-title"><a href= "#title2">title</a></code> attribute has special semantics on this element.</dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmllinkelement">HTMLLinkElement</dfn> : <a href="#htmlelement">HTMLElement</a> { attribute boolean <a href="#disabled" title= "dom-link-disabled">disabled</a>; attribute DOMString <a href="#href2" title= "dom-link-href">href</a>; attribute DOMString <a href="#rel0" title= "dom-link-rel">rel</a>; readonly attribute DOMTokenList <a href="#rellist" title= "dom-link-relList">relList</a>; attribute DOMString <a href="#media1" title= "dom-link-media">media</a>; attribute DOMString <a href="#hreflang0" title= "dom-link-hreflang">hreflang</a>; attribute DOMString <a href="#type0" title= "dom-link-type">type</a>; <ins class="diff-new"> attribute DOMString <a href= "#sizes" title="dom-link-sizes">sizes</a>; </ins> }; </pre> The <code>LinkStyle</code> interface must also be implemented by this element, the <a href="#styling0">styling processing model</a> defines how. <a href="#references">[CSSOM]</a> </dd> </dl> The <code><a href="#link">link</a></code> element allows authors to link their document to other resources. The destination of the link is given by the <dfn id="href1" title="attr-link-href"><code>href</code></dfn> attribute, which must be present and must contain a URI (or IRI). If the <code title="attr-link-href"><a href="#href1">href</a></code> attribute is absent, then the element does not define a link. The type of link indicated (the relationship) is given by the value of the <dfn id="rel" title= "attr-link-rel"><code>rel</code></dfn> attribute, which must be present, and must have a value that is a <a href="#set-of">set of space-separated tokens</a> . The <a href="#linkTypes">allowed values and their meanings</a> are defined in a later section. If the <code title="attr-link-rel"><a href="#rel">rel</a></code> attribute is absent, or if the value used is not allowed according to the definitions in this specification, then the element does not define a link. Two categories of links can be created using the <code><a href= "#link">link</a></code> element. <dfn id="links1" title= "external resource link">Links to external resources</dfn> are links to resources that are to be used to augment the current document, and <dfn id="hyperlink1" title="hyperlink link">hyperlink links</dfn> are <a href="#hyperlinks" title="hyperlink">links to other documents</a> . The <a href="#linkTypes">link types section</a> defines whether a particular link type is an external resource or a hyperlink. One element can create multiple links (of which some might be external resource links and some might be <del class="diff-old">hyperlinks).</del> <ins class= "diff-chg">hyperlinks); exactly which and how many links are created depends on the keywords given in the</ins> <code title= "attr-link-rel"><a href="#rel"><ins class= "diff-chg">rel</ins></a></code> <ins class= "diff-chg">attribute.</ins> User agents <del class= "diff-old">should</del> <ins class="diff-chg">must</ins> process the links on a per-link basis, not a per-element basis. The exact <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> for links to external resources depends on the exact relationship, as defined for the relevant link type. Some of the attributes control whether or not the external resource is to be applied (as defined below). For external resources that are represented in the DOM (for example, style sheets), the DOM representation must be made available even if the resource is not applied. (However, user agents may opt to only fetch such resources when they are needed, instead of pro-actively downloading all the external resources that are not applied.) <ins class="diff-new">HTTP semantics must be followed when fetching external resources. (For example, redirects must be followed and 404 responses must cause the external resource to not be applied.)</ins> Interactive user agents should provide users with a means to <a href="#following0" title="following hyperlinks">follow the hyperlinks</a> created using the <code><a href= "#link">link</a></code> element, somewhere within their user interface. The exact interface is not defined by this specification, but it should include the following information (obtained from the element's attributes, again as defined below), in some form or another (possibly simplified), for each hyperlink created with each <code><a href="#link">link</a></code> element in the document: <ul> <li>The relationship between this document and the resource (given by the <code title="attr-link-rel"><a href="#rel">rel</a></code> attribute)</li> <li>The title of the resource (given by the <code title= "attr-link-title"><a href="#title2">title</a></code> attribute).</li> <li>The URI of the resource (given by the <code title= "attr-link-href"><a href="#href1">href</a></code> attribute).</li> <li>The language of the resource (given by the <code title= "attr-link-hreflang"><a href="#hreflang">hreflang</a></code> attribute).</li> <li>The optimum media for the resource (given by the <code title= "attr-link-media"><a href="#media0">media</a></code> attribute).</li> </ul> User agents may also include other information, such as the type of the resource (as given by the <code title= "attr-link-type"><a href="#type">type</a></code> attribute). <ins class="diff-new">Hyperlinks created with the</ins> <code><a href="#link"><ins class= "diff-new">link</ins></a></code> <ins class="diff-new">element and its</ins> <code title="attr-link-rel"><a href="#rel"><ins class= "diff-new">rel</ins></a></code> <ins class="diff-new">attribute apply to the whole page. This contrasts with the</ins> <code title= "attr-hyperlink-rel"><a href="#rel3"><ins class= "diff-new">rel</ins></a></code> <ins class="diff-new">attribute of</ins> <code><a href="#a"><ins class= "diff-new">a</ins></a></code> <ins class="diff-new">and</ins> <code><a href="#area"><ins class="diff-new">area</ins></a></code> <ins class="diff-new">elements, which indicates the type of a link whose context is given by the link's location within the document.</ins> The <dfn id="media0" title= "attr-link-media"><code>media</code></dfn> attribute says which media the resource applies to. The value must be a valid <a href= "#mq">media <del class="diff-old">query.</del> <ins class= "diff-chg">query</ins></a> . <a href="#references">[MQ]</a> If the link is a <a href="#hyperlink1" title= "hyperlink link">hyperlink</a> then the <code title= "attr-link-media"><a href="#media0">media</a></code> attribute is purely advisory, and describes for which media the document in question was designed. However, if the link is an <a href="#links1">external resource link</a> , then the <code title="attr-link-media"><a href= "#media0">media</a></code> attribute is prescriptive. The user agent must <del class="diff-old">only</del> apply the external resource to views while their state match the listed <del class="diff-old">media.</del> <ins class="diff-chg">media, and must not apply them otherwise.</ins> The default, if the <code title= "attr-link-media"><a href="#media0">media</a></code> attribute is omitted, is <code>all</code> , meaning that by default links apply to all media. The <dfn id="hreflang" title= "attr-link-hreflang"><code>hreflang</code></dfn> attribute on the <code><a href="#link">link</a></code> element has the same semantics as the <a href="#hreflang3" title= "attr-hyperlink-hreflang"><code>hreflang</code> attribute on hyperlink elements</a> . The <dfn id="type" title= "attr-link-type"><code>type</code></dfn> attribute gives the MIME type of the linked resource. It is purely advisory. The value must be a valid MIME type, optionally with parameters. <a href= "#references">[RFC2046]</a> For <a href="#links1" title="external resource link">external resource links</a> , user agents may use the type given in this attribute to decide whether or not to consider using the resource at all. If the UA does not support the given MIME type for the given link relationship, then the UA may opt not to download and apply the resource. User agents must not consider the <code title= "attr-link-type"><a href="#type">type</a></code> attribute authoritative — upon fetching the resource, user agents must not use metadata included in the link to the resource to determine its type. If the attribute is omitted, <ins class="diff-new">but the user agent would fetch the resource if the type was known and supported,</ins> then the <del class="diff-old">UA</del> <ins class="diff-chg">user agent</ins> must fetch the resource <del class="diff-old">to</del> <ins class="diff-chg">and</ins> determine its type <del class="diff-old">and thus</del> <a href= "#content-type8" title="Content-Type"><ins class="diff-chg">from its Content-Type metadata</ins></a> <ins class="diff-chg">to</ins> determine if it supports (and can apply) that external resource. <ins class="diff-new">If no type metadata is specified, but the external resource link type has a default type defined, then the user agent must assume that the resource is of that type.</ins> <div class="example"> If a document contains <del class="diff-old">three</del> <ins class="diff-chg">four</ins> style sheet links <del class= "diff-old">labelled</del> <ins class="diff-chg">labeled</ins> as follows: <del class="diff-old"><link rel="stylesheet" href="A" type="text/css"> <link rel="stylesheet" href="B" type="text/plain"></del> <pre> <link rel="stylesheet" href="A" type="text/plain"> <ins class= "diff-chg"><link rel="stylesheet" href="B" type="text/css"> </ins> <link rel="stylesheet" href="C"> </pre> ...then a compliant UA that supported only CSS style sheets would fetch the <del class="diff-old">A</del> <ins class= "diff-chg">B</ins> and C files, and skip the <del class= "diff-old">B</del> <ins class="diff-chg">A</ins> file (since <code>text/plain</code> is not the MIME type for CSS style sheets). For <del class="diff-old">these two files,</del> <ins class= "diff-chg">files B and C,</ins> it would then check the actual types returned by the <del class="diff-old">UA.</del> <ins class= "diff-chg">server.</ins> For those that are sent as <code>text/css</code> , it would apply the styles, but for those <del class="diff-old">labelled</del> <ins class= "diff-chg">labeled</ins> as <code>text/plain</code> , or any other type, it would not. <ins class="diff-new">If one the two files was returned without a</ins> <a href="#content-type8"><ins class= "diff-new">Content-Type</ins></a> <ins class="diff-new">metadata, or with a syntactically incorrect type like</ins> <code title= ""><ins class="diff-new">Content-Type: "null"</ins></code> ,<ins class="diff-new">then the default type for</ins> <code title= "rel-stylesheet"><a href="#stylesheet"><ins class= "diff-new">stylesheet</ins></a></code> <ins class="diff-new">links would kick in. Since that default type is</ins> <code title= ""><ins class="diff-new">text/css</ins></code> ,<ins class= "diff-new">the style sheet</ins> <ins class= "diff-new">would</ins> <ins class="diff-new">nonetheless be applied.</ins> </div> The <dfn id="title2" title= "attr-link-title"><code>title</code></dfn> attribute gives the title of the link. With one exception, it is purely advisory. The value is text. The exception is for style sheet links, where the <code title="attr-link-title"><a href="#title2">title</a></code> attribute defines <a href="#alternative">alternative style sheet sets</a> . The <code title="attr-link-title"><a href= "#title2">title</a></code> attribute on <code><a href= "#link">link</a></code> elements differs from the global <code title="attr-title"><a href="#title">title</a></code> attribute of most other elements in that a link without a title does not inherit the title of the parent element: it merely has no title. <ins class="diff-new">The</ins> <code title= "attr-link-sizes"><a href="#sizes0"><ins class= "diff-new">sizes</ins></a></code> <ins class="diff-new">attribute is used with the</ins> <code title="rel-icon"><a href= "#icon3"><ins class="diff-new">icon</ins></a></code> <ins class= "diff-new">link type. The attribute must not be specified on</ins> <code><a href="#link"><ins class="diff-new">link</ins></a></code> <ins class="diff-new">elements that do not have a</ins> <code title="attr-link-rel"><a href="#rel"><ins class= "diff-new">rel</ins></a></code> <ins class="diff-new">attribute that specifies the</ins> <code title="rel-icon"><a href= "#icon3"><ins class="diff-new">icon</ins></a></code> <ins class= "diff-new">keyword.</ins> Some versions of HTTP defined a <code title="">Link:</code> header, to be processed like a series of <code><a href= "#link">link</a></code> elements. <del class="diff-old">When processing links, those must be taken into consideration as well. For</del> <ins class="diff-chg">If supported, for</ins> the purposes of <del class="diff-old">ordering,</del> <ins class= "diff-chg">ordering</ins> links defined by HTTP headers must be assumed to come before any links in the document, in the order that they were given in the HTTP entity header. Relative URIs in these headers <del class="diff-old">must be</del> <ins class= "diff-chg">are</ins> resolved according to the rules given in HTTP, not relative to base URIs set by the document (e.g. using a <code><a href="#base">base</a></code> element or <code title= "attr-xml-base"><a href="#xmlbase">xml:base</a></code> attributes). <a href="#references">[RFC2616]</a> <a href= "#references">[RFC2068]</a> The DOM attributes <dfn id="href2" title= "dom-link-href"><code>href</code></dfn> , <dfn id="rel0" title= "dom-link-rel"><code>rel</code></dfn> , <dfn id="media1" title= "dom-link-media"><code>media</code></dfn> , <dfn id="hreflang0" title="dom-link-hreflang"><code>hreflang</code></dfn> , and <dfn id="type0" title="dom-link-type"><code>type</code></dfn> , <ins class="diff-new">and</ins> <dfn id="sizes" title= "dom-link-sizes"><code><ins class= "diff-new">sizes</ins></code></dfn> each must <a href= "#reflect">reflect</a> the respective content attributes of the same name. The DOM attribute <dfn id="rellist" title= "dom-link-rellist"><code>relList</code></dfn> must <a href= "#reflect">reflect</a> the <code title="attr-link-rel"><a href= "#rel">rel</a></code> content attribute. The DOM attribute <dfn id="disabled" title= "dom-link-disabled"><code>disabled</code></dfn> only applies to style sheet links. When the <code><a href="#link">link</a></code> element defines a style sheet link, then the <code title= "dom-link-disabled"><a href="#disabled">disabled</a></code> attribute behaves as defined <a href="#disabled1" title= "dom-linkstyle-disabled">for the alternative style sheets DOM</a> . For all other <code><a href="#link">link</a></code> elements it always return false and does nothing on setting. <h4 id="meta"><del class= "diff-old">3.7.5.</del> <ins class="diff-chg">3.7.5</ins> The <dfn id="meta0"><code>meta</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#metadata0">Metadata content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>If the <code title="attr-meta-charset"><a href= "#charset1">charset</a></code> attribute is <del class= "diff-old">present:</del> <ins class="diff-chg">present, or if the element is in the</ins> <a href="#encoding" title= "attr-meta-http-equiv-content-type"><ins class="diff-chg">Encoding declaration state</ins></a> : as the first element in a <code><a href="#head">head</a></code> element.</dd> <dd>If the <code title="attr-meta-http-equiv"><a href= "#http-equiv0">http-equiv</a></code> attribute is <del class= "diff-old">present:</del> <ins class="diff-chg">present, and the element is not in the</ins> <a href="#encoding" title= "attr-meta-http-equiv-content-type"><ins class="diff-chg">Encoding declaration state</ins></a> : in a <code><a href= "#head">head</a></code> element.</dd> <dd>If the <code title="attr-meta-http-equiv"><a href= "#http-equiv0">http-equiv</a></code> attribute is <del class= "diff-old">present:</del> <ins class="diff-chg">present, and the element is not in the</ins> <a href="#encoding" title= "attr-meta-http-equiv-content-type"><ins class="diff-chg">Encoding declaration state</ins></a> : in a <code><a href= "#noscript">noscript</a></code> element that is a child of a <code><a href="#head">head</a></code> element.</dd> <dd>If the <code title="attr-meta-name"><a href= "#name">name</a></code> attribute is present: where <a href= "#metadata0">metadata content</a> is expected.</dd> <dt>Content model:</dt> <dd>Empty.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-meta-name"><a href= "#name">name</a></code></dd> <dd><code title="attr-meta-http-equiv"><a href= "#http-equiv0">http-equiv</a></code></dd> <dd><code title="attr-meta-content"><a href= "#content0">content</a></code></dd> <dd><code title="attr-meta-charset"><a href= "#charset1">charset</a></code> ( <a href="#html-" title= "HTML documents">HTML</a> only)</dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlmetaelement">HTMLMetaElement</dfn> : <a href="#htmlelement">HTMLElement</a> { attribute DOMString <a href="#content1" title= "dom-meta-content">content</a>; attribute DOMString <a href="#name0" title= "dom-meta-name">name</a>; attribute DOMString <a href="#httpequiv" title= "dom-meta-httpEquiv">httpEquiv</a>; }; </pre></dd> </dl> The <code><a href="#meta0">meta</a></code> element represents various kinds of metadata that cannot be expressed using the <code><a href="#title1">title</a></code> , <code><a href= "#base">base</a></code> , <code><a href="#link">link</a></code> , <code><a href="#style1">style</a></code> , and <code><a href= "#script1">script</a></code> elements. The <code><a href="#meta0">meta</a></code> element can represent document-level metadata with the <code title= "attr-meta-name"><a href="#name">name</a></code> attribute, pragma directives with the <code title="attr-meta-http-equiv"><a href= "#http-equiv0">http-equiv</a></code> attribute, and the file's <a href="#character2">character encoding declaration</a> when an HTML document is <del class="diff-old">serialised</del> <ins class= "diff-chg">serialized</ins> to string form (e.g. for transmission over the network or for disk storage) with the <code title= "attr-meta-charset"><a href="#charset1">charset</a></code> attribute. Exactly one of the <code title="attr-meta-name"><a href= "#name">name</a></code> , <code title= "attr-meta-http-equiv"><a href="#http-equiv0">http-equiv</a></code> , and <code title="attr-meta-charset"><a href= "#charset1">charset</a></code> attributes must be specified. If either <code title="attr-meta-name"><a href= "#name">name</a></code> or <code title= "attr-meta-http-equiv"><a href="#http-equiv0">http-equiv</a></code> is specified, then the <code title="attr-meta-content"><a href= "#content0">content</a></code> attribute must also be specified. Otherwise, it must be omitted. The <dfn id="charset1" title= "attr-meta-charset"><code><ins class= "diff-new">charset</ins></code></dfn> <ins class= "diff-new">attribute specifies the character encoding used by the document. This is called a</ins> <a href="#character2"><ins class= "diff-new">character encoding declaration</ins></a> . <ins class="diff-new">The</ins> <code title= "attr-meta-charset"><a href="#charset1">charset</a></code> attribute may <del class="diff-old">only</del> be specified in <a href="#html5" title="HTML5">HTML documents <del class= "diff-old">,</del></a> <ins class="diff-chg">only,</ins> it must not be used in <a href="#xhtml5" title="XHTML">XML documents</a> . If the <code title="attr-meta-charset"><a href= "#charset1">charset</a></code> attribute is specified, the element must be the first element in <a href="#the-head0">the <code>head</code> element</a> of the file. The <dfn id="content0" title= "attr-meta-content"><code>content</code></dfn> attribute gives the value of the document metadata or pragma directive when the element is used for those purposes. The allowed values depend on the exact context, as described in subsequent sections of this specification. If a <code><a href="#meta0">meta</a></code> element has a <dfn id="name" title="attr-meta-name"><code>name</code></dfn> attribute, it sets document metadata. Document metadata is expressed in terms of name/value pairs, the <code title= "attr-meta-name"><a href="#name">name</a></code> attribute on the <code><a href="#meta0">meta</a></code> element giving the name, and the <code title="attr-meta-content"><a href= "#content0">content</a></code> attribute on the same element giving the value. The name specifies what aspect of metadata is being set; valid names and the meaning of their values are described in the following sections. If a <code><a href="#meta0">meta</a></code> element has no <code title="attr-meta-content"><a href= "#content0">content</a></code> attribute, then the value part of the metadata name/value pair is the empty string. If a <code><a href="#meta0">meta</a></code> element has the <code title="attr-meta-http-equiv"><a href= "#http-equiv0">http-equiv</a></code> attribute specified, it must be either in a <code><a href="#head">head</a></code> element or in a <code><a href="#noscript">noscript</a></code> element that itself is in a <code><a href="#head">head</a></code> element. If a <code><a href="#meta0">meta</a></code> element does not have the <code title="attr-meta-http-equiv"><a href= "#http-equiv0">http-equiv</a></code> attribute specified, it must be in a <code><a href="#head">head</a></code> element. The DOM attributes <dfn id="name0" title= "dom-meta-name"><code>name</code></dfn> and <dfn id="content1" title="dom-meta-content"><code>content</code></dfn> must <a href= "#reflect">reflect</a> the respective content attributes of the same name. The DOM attribute <dfn id="httpequiv" title= "dom-meta-httpEquiv"><code>httpEquiv</code></dfn> must <a href= "#reflect">reflect</a> the content attribute <code title= "attr-meta-http-equiv"><a href="#http-equiv0">http-equiv</a></code> . <h5 id="standard">3.7.5.1. Standard metadata names</h5> This specification defines a few names for the <code title= "attr-meta-name"><a href="#name">name</a></code> attribute of the <code><a href="#meta0">meta</a></code> element. <dl> <dt><del class="diff-old">generator</del> <dfn id= "application-name" title="meta-application-name"><ins class= "diff-chg">application-name</ins></dfn></dt> <dd> The value must be a <ins class="diff-new">short</ins> free-form string that <del class="diff-old">identifies</del> <ins class= "diff-chg">giving</ins> the <del class="diff-old">software used to generate</del> <ins class="diff-chg">name of</ins> the <del class= "diff-old">document. This value</del> <ins class="diff-chg">Web application that the page represents. If the page is not a Web application, the</ins> <code title="meta-application-name"><a href= "#application-name"><ins class= "diff-chg">application-name</ins></a></code> <ins class= "diff-chg">metadata name</ins> must not be <del class= "diff-old">used on hand-authored pages. WYSIWYG editors have additional constraints</del> <ins class="diff-chg">used. User agents may use the application name in UI in preference to the page's</ins> <code><a href="#title1"><ins class= "diff-chg">title</ins></a> <del class="diff-old">on</del></code> , <ins class="diff-chg">since</ins> the <del class="diff-old">value used with this metadata name.</del> <ins class="diff-chg">title might include status messages and the like relevant to the status of the page at a particular moment in time instead of just being the name of the application.</ins> </dd> <dt><del class="diff-old">dns</del> <dfn id="description" title= "meta-description"><ins class= "diff-chg">description</ins></dfn></dt> <dd> The value must be <del class="diff-old">an ordered set of unique space-separated tokens , each word of which is</del> a <del class= "diff-old">host name. The list allows authors to provide a list of host names</del> <ins class="diff-chg">free-form string</ins> that <ins class="diff-new">describes</ins> the <del class= "diff-old">user is expected to subsequently need. User agents may, according to user preferences and prevailing network conditions, pre-emptively resolve the given DNS names (extracting the names from the</del> <ins class="diff-chg">page. The</ins> value <del class="diff-old">using the rules</del> <ins class= "diff-chg">must be appropriate</ins> for <del class= "diff-old">splitting</del> <ins class="diff-chg">use in</ins> a <ins class="diff-new">directory of pages, e.g. in a search engine.</ins> </dd> <dt><dfn id="generator" title="meta-generator"><ins class= "diff-new">generator</ins></dfn></dt> <dd> <ins class="diff-new">The value must be a free-form</ins> string <del class="diff-old">on spaces ), thus precaching the DNS information for those hosts and potentially reducing</del> <ins class="diff-chg">that identifies</ins> the <del class= "diff-old">time between page loads for subsequent user interactions. Higher priority should be given</del> <ins class= "diff-chg">software used</ins> to <del class="diff-old">host names given earlier in</del> <ins class="diff-chg">generate</ins> the <del class="diff-old">list.</del> <ins class="diff-chg">document. This value must not be used on hand-authored pages.</ins> </dd> </dl> <h5 id="other">3.7.5.2. Other metadata names</h5> <dfn id="extensions" title="concept-meta-extensions">Extensions to the predefined set of metadata names</dfn> may be registered in the <a href="http://wiki.whatwg.org/wiki/MetaExtensions">WHATWG Wiki MetaExtensions page</a> . Anyone is free to edit the WHATWG Wiki MetaExtensions page at any time to add a type. These new names must be specified with the following information: <dl> <dt>Keyword</dt> <dd> The actual name being defined. The name should not be confusingly similar to any other defined name (e.g. differing only in case). </dd> <dt>Brief description</dt> <dd> A short description of what the metadata name's meaning is, including the format the value is required to be in. </dd> <dt>Link to more details</dt> <dd>A link to a more detailed description of the metadata name's semantics and requirements. It could be another page on the Wiki, or a link to an external page.</dd> <dt>Synonyms</dt> <dd> A list of other names that have exactly the same processing requirements. Authors should not use the names defined to be synonyms, they are only intended to allow user agents to support legacy content. </dd> <dt>Status</dt> <dd> One of the following: <dl> <dt>Proposal</dt> <dd>The name has not received wide peer review and approval. Someone has proposed it and is using it.</dd> <dt>Accepted</dt> <dd>The name has received wide peer review and approval. It has a specification that unambiguously defines how to handle pages that use the name, including when they use it in incorrect ways.</dd> <dt>Unendorsed</dt> <dd>The metadata name has received wide peer review and it has been found wanting. Existing pages are using this keyword, but new pages should avoid it. The "brief description" and "link to more details" entries will give details of what authors should use instead, if anything.</dd> </dl> If a metadata name is added with the "proposal" status and found to be redundant with existing values, it should be removed and listed as a synonym for the existing value. </dd> </dl> Conformance checkers must use the information given on the WHATWG Wiki MetaExtensions page to establish if a value not explicitly defined in this specification is allowed or not. When an author uses a new type not defined by either this specification or the Wiki page, conformance checkers should offer to add the value to the Wiki, with the details described above, with the "proposal" status. This specification does not define how new values will get approved. It is expected that the Wiki will have a community that addresses this. Metadata names whose values are to be URIs must not be proposed or accepted. Links must be represented using the <code><a href= "#link">link</a></code> element, not the <code><a href= "#meta0">meta</a></code> element. <h5 id="pragma">3.7.5.3. Pragma directives</h5> When the <dfn id="http-equiv" title= "attr-meta-http-equiv"><code>http-equiv</code></dfn> attribute is specified on a <code><a href="#meta0">meta</a></code> element, the element is a pragma directive. The <dfn id="http-equiv0" title= "attr-meta-http-equiv"><code>http-equiv</code></dfn> attribute is an <a href="#enumerated">enumerated attribute</a> . The following table lists the keywords defined for this attribute. The states given in the first cell of the <del class="diff-old">the</del> rows with keywords give the states to which those keywords map. <table> <thead> <tr> <th>State</th> <th>Keywords</th> </tr> </thead> <tbody> <tr> <td><del class="diff-old">Refresh</del> <a href="#encoding" title= "attr-meta-http-equiv-content-type"><ins class="diff-chg">Encoding declaration</ins></a></td> <td><code title=""><del class="diff-old">refresh</del> <ins class= "diff-chg">Content-Type</ins></code></td> </tr> <tr> <td><a href="#default" title= "attr-meta-http-equiv-default-style">Default style</a></td> <td><code title="">default-style</code></td> </tr> <tr> <td><a href="#refresh" title= "attr-meta-http-equiv-refresh"><ins class= "diff-new">Refresh</ins></a></td> <td><code title=""><ins class="diff-new">refresh</ins></code></td> </tr> </tbody> </table> When a <code><a href="#meta0">meta</a></code> element is inserted into the document, if its <code title= "attr-meta-http-equiv"><a href="#http-equiv0">http-equiv</a></code> attribute is present and represents one of the above states, then the user agent must run the algorithm appropriate for that state, as described in the following list: <dl> <dt><dfn id="encoding" title= "attr-meta-http-equiv-content-type"><ins class="diff-new">Encoding declaration state</ins></dfn></dt> <dd> <ins class="diff-new">The</ins> <a href="#encoding" title= "attr-meta-http-equiv-content-type"><ins class="diff-new">Encoding declaration state's</ins></a> <ins class="diff-new">user agent requirements are all handled by the parsing section of the specification. The state is just an alternative form of setting the</ins> <code title="meta-charset"><ins class= "diff-new">charset</ins></code> <ins class="diff-new">attribute: it is a</ins> <a href="#character2"><ins class="diff-new">character encoding declaration</ins></a> . <ins class="diff-new">For</ins> <code><a href= "#meta0"><ins class="diff-new">meta</ins></a></code> <ins class= "diff-new">elements in the</ins> <a href="#encoding" title= "attr-meta-http-equiv-content-type"><ins class="diff-new">Encoding declaration state</ins></a> ,<ins class="diff-new">the</ins> <code title="attr-meta-content"><a href="#content0"><ins class= "diff-new">content</ins></a></code> <ins class="diff-new">attribute must have a value that is a case-insensitive match of a string that consists of the literal string "</ins> <code title=""><ins class= "diff-new">text/html;</ins></code> <ins class="diff-new">", optionally followed by any number of</ins> <a href="#space" title= "space character"><ins class="diff-new">space characters</ins></a> ,<ins class="diff-new">followed by the literal string "</ins> <code title=""><ins class="diff-new">charset=</ins></code> <ins class="diff-new">", followed by the character encoding name of</ins> <a href="#charset"><ins class="diff-new">the character encoding declaration</ins></a> . <ins class="diff-new">If the document contains a</ins> <code><a href="#meta0"><ins class="diff-new">meta</ins></a></code> <ins class="diff-new">element in the</ins> <a href="#encoding" title="attr-meta-http-equiv-content-type"><ins class= "diff-new">Encoding declaration state</ins></a> <ins class= "diff-new">then that element must be the first element in the document's</ins> <code><a href="#head"><ins class= "diff-new">head</ins></a></code> <ins class="diff-new">element, and the document must not contain a</ins> <code><a href= "#meta0"><ins class="diff-new">meta</ins></a></code> <ins class= "diff-new">element with the</ins> <code title= "attr-meta-charset"><a href="#charset1"><ins class= "diff-new">charset</ins></a></code> <ins class="diff-new">attribute present.</ins> <ins class="diff-new">The</ins> <a href="#encoding" title= "attr-meta-http-equiv-content-type"><ins class="diff-new">Encoding declaration state</ins></a> <ins class="diff-new">may be used in</ins> <a href="#html5" title="HTML5"><ins class="diff-new">HTML documents</ins></a> <ins class="diff-new">only, elements in that state must not be used in</ins> <a href="#xhtml5" title= "XHTML"><ins class="diff-new">XML documents</ins></a> . </dd> <dt><dfn id="default" title= "attr-meta-http-equiv-default-style"><ins class="diff-new">Default style state</ins></dfn></dt> <dd> <ol> <li class="big-issue">...</li> </ol> </dd> <dt><dfn id="refresh" title="attr-meta-http-equiv-refresh">Refresh state</dfn></dt> <dd> <ol> <li> If another <code><a href="#meta0">meta</a></code> element in the <a href="#refresh" title="attr-meta-http-equiv-refresh">Refresh state</a> has already been successfully processed (i.e. when it was inserted the user agent processed it and reached the last step of this list of steps), then abort these steps. </li> <li> If the <code><a href="#meta0">meta</a></code> element has no <code title="attr-meta-content"><a href= "#content0">content</a></code> attribute, or if that attribute's value is the empty string, then abort these steps. </li> <li> Let <var title="">input</var> be the value of the element's <code title="attr-meta-content"><a href= "#content0">content</a></code> attribute. </li> <li> Let <var title="">position</var> point at the first character of <var title="">input</var> . </li> <li> <a href="#skip-whitespace">Skip whitespace</a> . </li> <li> <a href="#collect" title= "collect a sequence of characters">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO to U+0039 DIGIT NINE, and parse the resulting string using the <a href="#rules">rules for parsing non-negative integers</a> . If the sequence of characters collected is the empty string, then no number will have been parsed; abort these steps. Otherwise, let <var title="">time</var> be the parsed number. </li> <li> <a href="#collect" title= "collect a sequence of characters">Collect a sequence of characters</a> in the range U+0030 DIGIT ZERO to U+0039 DIGIT NINE and U+002E FULL STOP (" <code title="">.</code> "). Ignore any collected characters. </li> <li> <a href="#skip-whitespace">Skip whitespace</a> . </li> <li> Let <var title="">url</var> be the address of the current page. </li> <li> If the character in <var title="">input</var> pointed to by <var title="">position</var> is a U+003B SEMICOLON (" <code title= "">;</code> "), then advance <var title="">position</var> to the next character. Otherwise, jump to the last step. </li> <li> <a href="#skip-whitespace">Skip whitespace</a> . </li> <li> If the character in <var title="">input</var> pointed to by <var title="">position</var> is one of U+0055 LATIN CAPITAL LETTER U or U+0075 LATIN SMALL LETTER U, then advance <var title= "">position</var> to the next character. Otherwise, jump to the last step. </li> <li> If the character in <var title="">input</var> pointed to by <var title="">position</var> is one of U+0052 LATIN CAPITAL LETTER R or U+0072 LATIN SMALL LETTER R, then advance <var title= "">position</var> to the next character. Otherwise, jump to the last step. </li> <li> If the character in <var title="">input</var> pointed to by <var title="">position</var> is one of U+004C LATIN CAPITAL LETTER L or U+006C LATIN SMALL LETTER L, then advance <var title= "">position</var> to the next character. Otherwise, jump to the last step. </li> <li> <a href="#skip-whitespace">Skip whitespace</a> . </li> <li> If the character in <var title="">input</var> pointed to by <var title="">position</var> is a U+003D EQUALS SIGN (" <code title="">=</code> "), then advance <var title= "">position</var> to the next character. Otherwise, jump to the last step. </li> <li> <a href="#skip-whitespace">Skip whitespace</a> . </li> <li> Let <var title="">url</var> be equal to the substring of <var title="">input</var> from the character at <var title= "">position</var> to the end of the string. </li> <li> Strip any trailing <a href="#space" title= "space character">space characters</a> from the end of <var title= "">url</var> . </li> <li> Strip any U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), and U+000D CARRIAGE RETURN (CR) characters from <var title= "">url</var> . </li> <li> Resolve the <var title="">url</var> value to an absolute URI using <a href="#elements2" title="element's base URI">the base URI</a> of the <code><a href="#meta0">meta</a></code> element. </li> <li> <ins class="diff-new">Perform one or more of the following steps:</ins> <ul> <li> Set a timer so that in <var title="">time</var> seconds, <ins class="diff-new">adjusted to take into account user or user agent preferences,</ins> if the user has not canceled the redirect, the user agent <a href="#navigate" title="navigate">navigates</a> <ins class="diff-new">the document's browsing context</ins> to <var title="">url</var> , with <a href="#replacement">replacement enabled</a> , <ins class="diff-new">and with the document's browsing context as the</ins> <a href="#source0"><ins class= "diff-new">source browsing context</ins></a> . </li> <li> <ins class="diff-new">Provide the user with an interface that, when selected,</ins> <ins class= "diff-new">navigates</ins> <ins class="diff-new">a</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">to</ins> <var title= ""><ins class="diff-new">url</ins></var> ,<ins class= "diff-new">with the document's browsing context as the</ins> <a href="#source0"><ins class="diff-new">source browsing context</ins></a> . </li> <li> <ins class="diff-new">Do nothing.</ins> </li> </ul> <ins class="diff-new">In addition, the user agent may, as with anything, inform the user of any and all aspects of its operation, including the state of any timers, the destinations of any timed redirects, and so forth.</ins> </li> </ol> For <code><a href="#meta0">meta</a></code> elements in the <a href="#refresh" title="attr-meta-http-equiv-refresh">Refresh state</a> , the <code title="attr-meta-content"><a href= "#content0">content</a></code> attribute must have a value consisting either of: <ul> <li>just a <a href="#valid">valid non-negative integer</a> , or</li> <li>a <a href="#valid">valid non-negative integer</a> , followed by a U+003B SEMICOLON ( <code title="">;</code> ), followed by one or more <a href="#space" title="space character">space characters</a> , followed by either a U+0055 LATIN CAPITAL LETTER U or a U+0075 LATIN SMALL LETTER U, a U+0052 LATIN CAPITAL LETTER R or a U+0072 LATIN SMALL LETTER R, a U+004C LATIN CAPITAL LETTER L or a U+006C LATIN SMALL LETTER L, a U+003D EQUALS SIGN ( <code title= "">=</code> ), and then a valid URI (or IRI).</li> </ul> In the former case, the integer represents a number of seconds before the page is to be reloaded; in the latter case the integer represents a number of seconds before the page is to be replaced by the page at the given URI. </dd> </dl> <ins class="diff-chg">There must not be more than one</ins> <code><del class="diff-old">Default style</del> <a href= "#meta0"><ins class="diff-chg">meta</ins></a></code> <ins class= "diff-chg">element with any particular</ins> state <del class= "diff-old">...</del> <ins class="diff-chg">in the document at a time.</ins> <h5 id="charset">3.7.5.4. Specifying the document's character encoding</h5> <del class="diff-old">The meta element may also be used to provide UAs with</del> <ins class="diff-chg">A</ins> <dfn id= "character2">character encoding <del class="diff-old">information for HTML files, by setting the charset</del> <ins class= "diff-chg">declaration</ins></dfn> <del class="diff-old">attribute to the name of a character encoding. This</del> is <del class= "diff-old">called</del> a <ins class="diff-new">mechanism by which the</ins> character encoding <del class= "diff-old">declaration.</del> <ins class="diff-chg">used to store or transmit a document is specified.</ins> The following restrictions apply to character encoding declarations: <ul> <li>The character encoding name given must be the name of the character encoding used to <del class="diff-old">serialise</del> <ins class="diff-chg">serialize</ins> the file.</li> <li>The value must be a valid character encoding name, and must be the preferred name for that encoding. <a href= "#references">[IANACHARSET]</a></li> <li>The <del class="diff-old">attribute value</del> <ins class= "diff-chg">character encoding declaration</ins> must be <del class= "diff-old">serialised</del> <ins class="diff-chg">serialized</ins> without the use of <a href="#character3" title= "syntax-charref">character <del class="diff-old">entity</del> references</a> <ins class="diff-new">or character escapes</ins> of any kind.</li> </ul> If the document does not start with a BOM, and if its encoding is not explicitly given by <a href="#content-type8" title= "Content-Type">Content-Type metadata</a> , then the character encoding used must be <del class="diff-old">a superset of US-ASCII (specifically, ANSI_X3.4-1968) for bytes in the range 0x09 - 0x0D, 0x20, 0x21, 0x22, 0x26, 0x27, 0x2C - 0x3F, 0x41 - 0x5A, and 0x61 - 0x7A ,</del> <ins class="diff-chg">an</ins> <a href= "#ascii-compatible"><ins class="diff-chg">ASCII-compatible character encoding</ins></a> , and, in addition, if that encoding isn't US-ASCII itself, then the encoding must be specified using a <code><a href="#meta0">meta</a></code> element with a <code title= "attr-meta-charset"><a href="#charset1">charset</a></code> <del class="diff-old">attribute.</del> <ins class= "diff-chg">attribute or a</ins> <code><a href="#meta0"><ins class= "diff-chg">meta</ins></a></code> <ins class="diff-chg">element in the</ins> <a href="#encoding" title= "attr-meta-http-equiv-content-type"><ins class="diff-chg">Encoding declaration state</ins></a> . <ins class="diff-chg">If the document contains a</ins> <code><a href="#meta0"><ins class="diff-chg">meta</ins></a></code> <ins class="diff-chg">element with a</ins> <code title= "attr-meta-charset"><a href="#charset1"><ins class= "diff-chg">charset</ins></a></code> <ins class="diff-chg">attribute or a</ins> <code><a href="#meta0"><ins class= "diff-chg">meta</ins></a></code> <ins class="diff-chg">element in the</ins> <a href="#encoding" title= "attr-meta-http-equiv-content-type"><ins class="diff-chg">Encoding declaration state</ins></a> ,<ins class="diff-chg">then the character encoding used must be an</ins> <a href= "#ascii-compatible"><ins class="diff-chg">ASCII-compatible character encoding</ins></a> . <ins class="diff-chg">An</ins> <dfn id= "ascii-compatible"><ins class="diff-chg">ASCII-compatible character encoding</ins></dfn> <ins class="diff-chg">is one that is a superset of US-ASCII (specifically, ANSI_X3.4-1968) for bytes in the range 0x09 - 0x0D, 0x20, 0x21, 0x22, 0x26, 0x27, 0x2C - 0x3F, 0x41 - 0x5A, and 0x61 - 0x7A .</ins> Authors should not use JIS_X0212-1990, x-JIS0208, and encodings based on EBCDIC. Authors should not use UTF-32. Authors must not use the CESU-8, UTF-7, BOCU-1 and SCSU encodings. <a href= "#references">[CESU8]</a> <a href="#references">[UTF7]</a> <a href= "#references">[BOCU1]</a> <a href="#references">[SCSU]</a> Authors are encouraged to use UTF-8. Conformance checkers may advise against authors using legacy encodings. In XHTML, the XML declaration should be used for inline character encoding information, if necessary. <h4 id="the-style0"><del class= "diff-old">3.7.6.</del> <ins class="diff-chg">3.7.6</ins> The <dfn id="style1"><code>style</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#metadata0">Metadata content</a> .</dd> <dd>If the <code title="attr-style-scoped"><a href= "#scoped">scoped</a></code> attribute is present: <del class= "diff-old">prose</del> <a href="#flow-content0"><ins class= "diff-chg">flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>If the <code title="attr-style-scoped"><a href= "#scoped">scoped</a></code> attribute is absent: where <a href= "#metadata0">metadata content</a> is expected.</dd> <dd>If the <code title="attr-style-scoped"><a href= "#scoped">scoped</a></code> attribute is absent: in a <code><a href="#noscript">noscript</a></code> element that is a child of a <code><a href="#head">head</a></code> element.</dd> <dd>If the <code title="attr-style-scoped"><a href= "#scoped">scoped</a></code> attribute is present: where <del class= "diff-old">prose</del> <a href="#flow-content0"><ins class= "diff-chg">flow</ins> content</a> is expected, but before any sibling elements other than <code><a href= "#style1">style</a></code> elements and before any text nodes other than <a href="#inter-element">inter-element whitespace</a> .</dd> <dt>Content model:</dt> <dd>Depends on the value of the <code title= "attr-style-type"><a href="#type1">type</a></code> attribute.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-style-media"><a href= "#media2">media</a></code></dd> <dd><code title="attr-style-type"><a href= "#type1">type</a></code></dd> <dd><code title="attr-style-scoped"><a href= "#scoped">scoped</a></code></dd> <dd>Also, the <code title="attr-style-title"><a href= "#title3">title</a></code> attribute has special semantics on this element.</dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlstyleelement">HTMLStyleElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute boolean <code title= "dom-style-disabled"><a href="#disabled0">disabled</a></code>; attribute DOMString <code title= "dom-style-media"><a href="#media3">media</a></code>; attribute DOMString <code title= "dom-style-type"><a href="#type2">type</a></code>; attribute boolean <code title= "dom-style-scoped"><a href="#scoped0">scoped</a></code>; }; </pre> The <code>LinkStyle</code> interface must also be implemented by this element, the <a href="#styling0">styling processing model</a> defines how. <a href="#references">[CSSOM]</a> </dd> </dl> The <code><a href="#style1">style</a></code> element allows authors to embed style information in their documents. The <code><a href="#style1">style</a></code> element is one of several inputs to the <a href="#styling0">styling processing model</a> . If the <dfn id="type1" title= "attr-style-type"><code>type</code></dfn> attribute is given, it must contain a valid MIME type, optionally with parameters, that designates a styling language. <a href="#references">[RFC2046]</a> If the attribute is absent, the type defaults to <code>text/css</code> . <a href="#references">[RFC2138]</a> When examining types to determine if they support the language, user agents must not ignore unknown MIME parameters — types with unknown parameters must be assumed to be unsupported. The <dfn id="media2" title= "attr-style-media"><code>media</code></dfn> attribute says which media the styles apply to. The value must be a valid <a href= "#mq">media <del class="diff-old">query.</del> <ins class= "diff-chg">query</ins></a> . <a href="#references">[MQ]</a> User agents must <del class="diff-old">only</del> apply the styles to views while their state match the listed <del class= "diff-old">media.</del> <ins class="diff-chg">media, and must not apply them otherwise.</ins> <a href= "#references">[DOM3VIEWS]</a> The default, if the <code title= "attr-style-media"><a href="#media2">media</a></code> attribute is omitted, is <code>all</code> , meaning that by default styles apply to all media. The <dfn id="scoped" title= "attr-style-scoped"><code>scoped</code></dfn> attribute is a <a href="#boolean0">boolean attribute</a> . If the attribute is present, then the user agent must <del class="diff-old">only</del> apply the specified style information <ins class= "diff-new">only</ins> to the <code><a href= "#style1">style</a></code> element's parent element (if any), and that element's child nodes. Otherwise, the specified styles must, if applied, be applied to the entire document. <del class= "diff-old">If the scoped attribute is not specified, the style element must be the child of a head element or of a noscript element that is a child of a head element. If the scoped attribute is specified, then the style element must be the child of a prose content element, before any text nodes other than inter-element whitespace , and before any elements other than other style elements.</del> The <dfn id="title3" title= "attr-style-title"><code>title</code></dfn> attribute on <code><a href="#style1">style</a></code> elements defines <a href= "#alternative">alternative style sheet sets</a> . If the <code><a href="#style1">style</a></code> element has no <code title="attr-style-title"><a href="#title3">title</a></code> attribute, then it has no title; the <code title= "attr-title"><a href="#title">title</a></code> attribute of ancestors does not apply to the <code><a href= "#style1">style</a></code> element. The <code title="attr-style-title"><a href= "#title3">title</a></code> attribute on <code><a href= "#style1">style</a></code> elements, like the <code title= "attr-link-title"><a href="#title2">title</a></code> attribute on <code><a href="#link">link</a></code> elements, differs from the global <code title="attr-title"><a href="#title">title</a></code> attribute in that a <code><a href="#style1">style</a></code> block without a title does not inherit the title of the parent element: it merely has no title. All descendant elements must be processed, according to their semantics, before the <code><a href="#style1">style</a></code> element itself is evaluated. For styling languages that consist of pure text, user agents must evaluate <code><a href= "#style1">style</a></code> elements by passing the concatenation of the contents of all the <a href="#text-node" title="text node">text nodes</a> that are direct children of the <code><a href= "#style1">style</a></code> element (not any other nodes such as comments or elements), in <a href="#tree-order">tree order</a> , to the style system. For XML-based styling languages, user agents must pass all the children nodes of the <code><a href= "#style1">style</a></code> element to the style system. This specification does not specify a style system, but CSS is expected to be supported by most Web browsers. <a href= "#references">[CSS21]</a> The <dfn id="media3" title= "dom-style-media"><code>media</code></dfn> , <dfn id="type2" title= "dom-style-type"><code>type</code></dfn> and <dfn id="scoped0" title="dom-style-scoped"><code>scoped</code></dfn> DOM attributes must <a href="#reflect">reflect</a> the respective content attributes of the same name. The DOM <dfn id="disabled0" title= "dom-style-disabled"><code>disabled</code></dfn> attribute behaves as defined <a href="#disabled1" title="dom-linkstyle-disabled">for the alternative style sheets DOM</a> . <h4 id="styling"><del class= "diff-old">3.7.7.</del> <ins class="diff-chg">3.7.7</ins> <dfn id="styling0" title= "styling processing model">Styling</dfn></h4> The <code><a href="#link">link</a></code> and <code><a href= "#style1">style</a></code> elements can provide styling information for the user agent to use when rendering the document. The DOM Styling specification specifies what styling information is to be used by the user agent and how it is to be used. <a href= "#references">[CSSOM]</a> The <code><a href="#style1">style</a></code> and <code><a href= "#link">link</a></code> elements implement the <code>LinkStyle</code> interface. <a href= "#references">[CSSOM]</a> For <code><a href="#style1">style</a></code> elements, if the user agent does not support the specified styling language, then the <code title="dom-LinkStyle-sheet">sheet</code> attribute of the element's <code>LinkStyle</code> interface must return null. Similarly, <code><a href="#link">link</a></code> elements that do not represent <a href="#stylesheet" title="rel-stylesheet">external resource links that contribute to the styling processing model</a> (i.e. that do not have a <code title="rel-stylesheet"><a href= "#stylesheet">stylesheet</a></code> keyword in their <code title= "attr-link-rel"><a href="#rel">rel</a></code> attribute), and <code><a href="#link">link</a></code> elements whose specified resource has not yet been downloaded, or is not in a supported styling language, must have their <code>LinkStyle</code> interface's <code title="dom-LinkStyle-sheet">sheet</code> attribute return null. Otherwise, the <code>LinkStyle</code> interface's <code title= "dom-LinkStyle-sheet">sheet</code> attribute must return a <code>StyleSheet</code> object with the attributes implemented as follows: <a href="#references">[CSSOM]</a> <dl> <dt>The content type ( <code title= "dom-stylesheet-type">type</code> DOM attribute)</dt> <dd> The content type must be the same as the style's specified type. For <code><a href="#style1">style</a></code> elements, this is the same as the <code title="attr-style-type"><a href= "#type1">type</a></code> content attribute's value, or <code title= "">text/css</code> if that is omitted. For <code><a href= "#link">link</a></code> elements, this is the <a href= "#content-type8" title="Content-Type">Content-Type metadata of the specified resource</a> . </dd> <dt>The location ( <code title="dom-stylesheet-href">href</code> DOM attribute)</dt> <dd> For <code><a href="#link">link</a></code> elements, the location must be the URI given by the element's <code title= "attr-link-href"><a href="#href1">href</a></code> content attribute. For <code><a href="#style1">style</a></code> elements, there is no location. </dd> <dt>The intended destination media for style information ( <code title="dom-stylesheet-media">media</code> DOM attribute)</dt> <dd> The media must be the same as the value of the element's <code title="">media</code> content attribute. </dd> <dt>The style sheet title ( <code title= "dom-stylesheet-title">title</code> DOM attribute)</dt> <dd> The title must be the same as the value of the element's <code title="">title</code> content attribute. If the attribute is absent, then the style sheet does not have a title. The title is used for defining <dfn id="alternative">alternative style sheet sets</dfn> . </dd> </dl> The <dfn id="disabled1" title= "dom-LinkStyle-disabled"><code>disabled</code></dfn> DOM attribute on <code><a href="#link">link</a></code> and <code><a href= "#style1">style</a></code> elements must return false and do nothing on setting, if the <code title= "dom-linkstyle-sheet">sheet</code> attribute of their <code>LinkStyle</code> interface is null. Otherwise, it must return the value of the <code>StyleSheet</code> interface's <code title= "dom-stylesheet-disabled">disabled</code> attribute on getting, and forward the new value to that same attribute on setting. <h3 id="sections"><del class= "diff-old">3.8.</del> <ins class="diff-chg">3.8</ins> Sections</h3> Some elements, for example <code><a href= "#address">address</a></code> elements, are scoped to their nearest ancestor <a href="#sectioning0">sectioning <del class= "diff-old">content.</del> <ins class="diff-chg">content</ins></a> . For such elements <var title="">x</var> , the elements that apply to a <a href="#sectioning0">sectioning content</a> element <var title="">e</var> are all the <var title="">x</var> elements whose nearest <a href="#sectioning0">sectioning content</a> ancestor is <var title="">e</var> . <h4 id="the-body"><del class= "diff-old">3.8.1.</del> <ins class="diff-chg">3.8.1</ins> The <dfn id="body0"><code>body</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#sectioning0">Sectioning content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>As the second element in an <code><a href= "#html">html</a></code> element.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <pre> <ins class="diff-chg">class=idl> interface </ins><dfn id="htmlbodyelement"><ins class="diff-chg"> HTMLBodyElement </ins></dfn><ins class="diff-chg"> : </ins> <a href="#htmlelement"> HTMLElement </a> <del class="diff-old">. </del> <ins class="diff-chg">{}; </ins> </pre></dd> </dl> The <code><a href="#body0">body</a></code> element represents the main content of the document. In conforming documents, there is only one <code><a href= "#body0">body</a></code> element. The <code title= "dom-document-body"><a href="#body">document.body</a></code> DOM attribute provides scripts with easy access to a document's <code><a href="#body0">body</a></code> element. Some DOM operations (for example, parts of the <a href="#drag-and">drag and drop</a> model) are defined in terms of " <a href="#the-body1">the body element</a> ". This refers to a particular element in the DOM, as per the definition of the term, and not any arbitrary <code><a href="#body0">body</a></code> element. <h4 id="the-section"><del class= "diff-old">3.8.2.</del> <ins class="diff-chg">3.8.2</ins> The <dfn id="section"><code>section</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dd><a href="#sectioning0">Sectioning content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#section">section</a></code> element represents a generic document or application section. A section, in this context, is a thematic grouping of content, typically with a header, possibly with a footer. Examples of sections would be chapters, the various tabbed pages in a tabbed dialog box, or the numbered sections of a thesis. A Web site's home page could be split into sections for an introduction, news items, contact information. <h4 id="the-nav"><del class= "diff-old">3.8.3.</del> <ins class="diff-chg">3.8.3</ins> The <dfn id="nav"><code>nav</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dd><a href="#sectioning0">Sectioning content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#nav">nav</a></code> element represents a section of a page that links to other pages or to parts within the page: a section with navigation links. <ins class="diff-new">Not all groups of links on a page need to be in a</ins> <code><a href= "#nav"><ins class="diff-new">nav</ins></a></code> <ins class= "diff-new">element — only sections that consist of primary navigation blocks are appropriate for the</ins> <code><a href= "#nav"><ins class="diff-new">nav</ins></a></code> <ins class= "diff-new">element. In particular, it is common for footers to have a list of links to various key parts of a site, but the</ins> <code><a href="#footer"><ins class= "diff-new">footer</ins></a></code> <ins class="diff-new">element is more appropriate in such cases.</ins> <div class="example"> <ins class="diff-new">In the following example, the page has several places where links are present, but only one of those places is considered a navigation section.</ins> <pre> <body><ins class="diff-new"> <header> <h1>Wake up sheeple!</h1> <p><a href="news.html">News</a> - <a href="blog.html">Blog</a> - <a href="forums.html">Forums</a></p> </header> <nav> <h1>Navigation</h1> <ul> <li><a href="articles.html">Index of all articles</a><li> <li><a href="today.html">Things sheeple need to wake up for today</a><li> <li><a href="successes.html">Sheeple we have managed to wake</a><li> </ul> </nav> <article> <p>...page content would be here... </article> <footer> <p>Copyright © 2006 The Example Company <p><a href="about.html">About</a> - <a href="policy.html">Privacy Policy</a> - <a href="contact.html">Contact Us</a></p> </footer> </body> </ins> </pre></div> <h4 id="the-article"><del class= "diff-old">3.8.4.</del> <ins class="diff-chg">3.8.4</ins> The <dfn id="article"><code>article</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dd><a href="#sectioning0">Sectioning content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#article">article</a></code> element represents a section of a page that consists of a composition that forms an independent part of a document, page, or site. This could be a forum post, a magazine or newspaper article, a Web log entry, a user-submitted comment, or any other independent item of content. An <code><a href="#article">article</a></code> element is "independent" in that its contents could stand alone, for example in syndication. However, the element is still associated with its ancestors; for instance, contact information that <a href="#applyToSection">applies</a> to a parent <code><a href="#body0">body</a></code> element still covers the <code><a href="#article">article</a></code> as well. When <code><a href="#article">article</a></code> elements are nested, the inner <code><a href="#article">article</a></code> elements represent articles that are in principle related to the contents of the outer article. For instance, a Web log entry on a site that accepts user-submitted comments could represent the comments as <code><a href="#article">article</a></code> elements nested within the <code><a href="#article">article</a></code> element for the Web log entry. Author information associated with an <code><a href= "#article">article</a></code> element (q.v. the <code><a href= "#address">address</a></code> element) does not apply to nested <code><a href="#article">article</a></code> elements. <del class= "diff-old">3.8.5. The blockquote element Categories Prose content . Sectioning content . Contexts in which this element may be used: Where prose content is expected. Content model: Prose content . Element-specific attributes: cite DOM interface: <pre class=idl>interface { attribute DOMString ; }; The HTMLQuoteElement interface is also used by the q element. The blockquote element represents a section that is quoted from another source. Content inside a blockquote must be quoted from another source, whose URI, if it has one, should be cited in the cite attribute. If the cite attribute is present, it must be a URI (or IRI). User agents should allow users to follow such citation links. If a blockquote element is preceded or followed by a paragraph that contains a single cite element and is itself not preceded or followed by another blockquote element and does not itself have a q element descendant, then, the citation given by that cite element gives the source of the quotation contained in the blockquote element. The cite DOM attribute reflects the element's cite content attribte. The best way to represent a conversation is not with the cite and blockquote elements, but with the dialog element.</del> <h4 id="the-aside"><del class= "diff-old">3.8.6.</del> <ins class="diff-chg">3.8.5</ins> The <dfn id="aside"><code>aside</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dd><a href="#sectioning0">Sectioning content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#aside">aside</a></code> element represents a section of a page that consists of content that is tangentially related to the content around the <code><a href= "#aside">aside</a></code> element, and which could be considered separate from that content. Such sections are often represented as sidebars in printed typography. <div class="example"> <ins class="diff-new">The following example shows how an aside is used to mark up background material on Switzerland in a much longer news story on Europe.</ins> <pre> <aside><ins class="diff-new"> <h1>Switzerland</h1> <p>Switzerland, a land-locked country in the middle of geographic Europe, has not joined the geopolitical European Union, though it is a signatory to a number of European treaties. </aside> </ins> </pre></div> <div class="example"> <ins class="diff-new">The following example shows how an aside is used to mark up a pull quote in a longer article.</ins> <pre> ...<ins class="diff-new"> <p>He later joined a large company, continuing on the same work. <q>I love my job. People ask me what I do for fun when I'm not at work. But I'm paid to do my hobby, so I never know what to answer. Some people wonder what they would do if they didn't have to work... but I know what I would do, because I was unemployed for a year, and I filled that time doing exactly what I do now.</q></p> <aside> <q> People ask me what I do for fun when I'm not at work. But I'm paid to do my hobby, so I never know what to answer. </q> </aside> <p>Of course his work — or should that be hobby? — isn't his only passion. He also enjoys other pleasures. ... </ins> </pre></div> <h4 id="the-h1"><del class= "diff-old">3.8.7.</del> <ins class="diff-chg">3.8.6</ins> The <dfn id="h1"><code>h1</code></dfn> , <dfn id= "h2"><code>h2</code></dfn> , <dfn id="h3"><code>h3</code></dfn> , <dfn id="h4"><code>h4</code></dfn> , <dfn id= "h5"><code>h5</code></dfn> , and <dfn id="h6"><code>h6</code></dfn> elements</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dd><a href="#heading0">Heading content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> These elements define headers for their sections. The semantics and meaning of these elements are defined in the section on <a href="#headings0">headings and sections</a> . These elements have a <dfn id="rank">rank</dfn> given by the number in their name. The <code><a href="#h1">h1</a></code> element is said to have the highest rank, the <code><a href= "#h6">h6</a></code> element has the lowest rank, and two elements with the same name have equal rank. <h4 id="the-header"><del class= "diff-old">3.8.8.</del> <ins class="diff-chg">3.8.7</ins> The <dfn id="header"><code>header</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dd><a href="#heading0">Heading content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> , including at least one descendant that is <a href= "#heading0">heading content</a> , but no <a href= "#sectioning0">sectioning content</a> descendants, no <code><a href="#header">header</a></code> element descendants, and no <code><a href="#footer">footer</a></code> element descendants.</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#header">header</a></code> element represents the header of a section. <del class="diff-old">Headers</del> <ins class="diff-chg">The element is typically used to group a set of</ins> <code><a href="#h1"><ins class= "diff-chg">h1</ins></a></code> <ins class="diff-chg">–</ins> <code><a href="#h6"><ins class="diff-chg">h6</ins></a></code> <ins class="diff-chg">elements to mark up a page's title with its subtitle or tagline. However,</ins> <code><a href= "#header"><ins class="diff-chg">header</ins></a></code> <ins class= "diff-chg">elements</ins> may contain more than just the section's <del class="diff-old">heading</del> <ins class="diff-chg">headings and subheadings</ins> — for example it would be reasonable for the header to include version history information. For the purposes of document summaries, outlines, and the like, <code><a href="#header">header</a></code> elements are equivalent to the highest <a href="#rank" title="rank">ranked</a> <code><a href="#h1">h1</a></code> <del class="diff-old">-</del> <ins class="diff-chg">–</ins> <code><a href="#h6">h6</a></code> element descendant of the <code><a href="#header">header</a></code> element (the first such element if there are multiple elements with that <a href="#rank">rank</a> ). Other heading elements in the <code><a href= "#header">header</a></code> element indicate subheadings or subtitles. <ins class="diff-new">The</ins> <a href="#rank"><ins class= "diff-new">rank</ins></a> <ins class="diff-new">of a</ins> <code><a href="#header"><ins class= "diff-new">header</ins></a></code> <ins class="diff-new">element is the same as for an</ins> <code><a href="#h1"><ins class= "diff-new">h1</ins></a></code> <ins class="diff-new">element (the highest rank).</ins> <ins class="diff-new">The section on</ins> <a href= "#headings0"><ins class="diff-new">headings and sections</ins></a> <ins class="diff-new">defines how</ins> <code><a href= "#header"><ins class="diff-new">header</ins></a></code> <ins class= "diff-new">elements are assigned to individual sections.</ins> <div class="example"> Here are some examples of valid headers. In each case, the emphasised text represents the text that would be used as the header in an application extracting header data and ignoring subheadings. <pre> <header> <h1>The reality dysfunction</h1> <h2>Space is not the only void</h2> </header> </pre> <pre> <header> <ins class= "diff-new"> <h1>Dr. Strangelove</h1> <h2>Or: How I Learned to Stop Worrying and Love the Bomb</h2> </header> </ins> </pre> <pre> <header> <p>Welcome to... <h1>Voidwars!</h1> </header> </pre> <pre> <header> <h1>Scalable Vector Graphics (SVG) 1.2</h1> <h2>W3C Working Draft 27 October 2004</h2> <dl> <dt>This version:</dt> <dd><a href="http://www.w3.org/TR/2004/WD-SVG12-20041027/">http://www.w3.org/TR/2004/WD-SVG12-20041027/</a></dd> <dt>Previous version:</dt> <dd><a href="http://www.w3.org/TR/2004/WD-SVG12-20040510/">http://www.w3.org/TR/2004/WD-SVG12-20040510/</a></dd> <dt>Latest version of SVG 1.2:</dt> <dd><a href="http://www.w3.org/TR/SVG12/">http://www.w3.org/TR/SVG12/</a></dd> <dt>Latest SVG Recommendation:</dt> <dd><a href="http://www.w3.org/TR/SVG/">http://www.w3.org/TR/SVG/</a></dd> <dt>Editor:</dt> <dd>Dean Jackson, W3C, <a href="mailto:dean@w3.org">dean@w3.org</a></dd> <dt>Authors:</dt> <dd>See <a href="#authors">Author List</a></dd> </dl> <p class="copyright"><a href="http://www.w3.org/Consortium/Legal/ipr-notic ... </header> </pre></div> <del class="diff-old">The section on headings and sections defines how header elements are assigned to individual sections. The rank of a header element is the same as for an h1 element (the highest rank).</del> <h4 id="the-footer"><del class= "diff-old">3.8.9.</del> <ins class="diff-chg">3.8.8</ins> The <dfn id="footer"><code>footer</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> , but with no <a href="#heading0">heading content</a> descendants, no <a href="#sectioning0">sectioning content</a> descendants, and no <code><a href="#footer">footer</a></code> element descendants.</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#footer">footer</a></code> element represents the footer for the section it <a href="#applyToSection">applies</a> to. A footer typically contains information about its section such as who wrote it, links to related documents, copyright data, and the like. Contact information for the section given in a <code><a href= "#footer">footer</a></code> should be marked up using the <code><a href="#address">address</a></code> element. <ins class="diff-new">Footers don't necessarily have to appear at the end of a section, though they usually do.</ins> <div class="example"> <ins class="diff-new">Here is a page with two footers, one at the top and one at the bottom, with the same content:</ins> <pre> <body> <ins class= "diff-new"> <footer><a href="../">Back to index...</a></footer> <h1>Lorem ipsum</h1> <p>A dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. <footer><a href="../">Back to index...</a></footer> </body> </ins> </pre></div> <h4 id="the-address"><del class= "diff-old">3.8.10.</del> <ins class="diff-chg">3.8.9</ins> The <dfn id="address"><code>address</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> , but with no <a href="#heading0">heading content</a> descendants, no <a href="#sectioning0">sectioning content</a> descendants, no <code><a href="#footer">footer</a></code> element descendants, and no <code><a href="#address">address</a></code> element descendants.</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#address">address</a></code> element represents the contact information for the section it <a href= "#applyToSection">applies</a> to. <ins class="diff-new">If it applies to</ins> <a href="#the-body1"><ins class= "diff-new">the</ins> <code><ins class="diff-new">body</ins></code> <ins class="diff-new">element</ins></a> ,<ins class="diff-new">then it instead applies to the document as a whole.</ins> <div class="example"> For example, a page at the W3C Web site related to HTML might include the following contact information: <pre> <ADDRESS> <A href="../People/Raggett/">Dave Raggett</A>, <A href="../People/Arnaud/">Arnaud Le Hors</A>, contact persons for the <A href="Activity">W3C HTML Activity</A> </ADDRESS> </pre></div> The <code><a href="#address">address</a></code> element must not be used to represent arbitrary addresses (e.g. postal addresses), unless those addresses are contact information for the section. (The <code><a href="#p">p</a></code> element is the appropriate element for marking up such addresses.) The <code><a href="#address">address</a></code> element must not contain information other than contact information. <div class="example"> For example, the following is non-conforming use of the <code><a href="#address">address</a></code> element: <pre> <ADDRESS> Last Modified: 1999/12/24 23:37:50</ADDRESS> </pre></div> Typically, the <code><a href="#address">address</a></code> element would be included with other information in a <code><a href="#footer">footer</a></code> element. To determine the contact information for a <a href= "#sectioning0">sectioning <ins class="diff-new">content</ins></a> element (such as a document's <code><a href= "#body0">body</a></code> element, which would give the contact information for the page), UAs must collect all the <code><a href= "#address">address</a></code> elements that <a href= "#applyToSection">apply</a> to that <a href= "#sectioning0">sectioning <ins class="diff-new">content</ins></a> element and its ancestor <a href="#sectioning0">sectioning <ins class="diff-new">content</ins></a> elements. The contact information is the collection of all the information given by those elements. Contact information for one <a href= "#sectioning0">sectioning <ins class="diff-new">content</ins></a> element, e.g. an <code><a href="#aside">aside</a></code> element, does not apply to its ancestor elements, e.g. the page's <code><a href="#body0">body</a></code> . <h4 id="headings"><del class= "diff-old">3.8.11.</del> <ins class="diff-chg">3.8.10</ins> <dfn id="headings0">Headings and sections</dfn></h4> The <code><a href="#h1">h1</a></code> <del class= "diff-old">-</del> <ins class="diff-chg">–</ins> <code><a href= "#h6">h6</a></code> elements and the <code><a href= "#header">header</a></code> element are headings. The first element of <a href="#heading0">heading content</a> in an element of <a href="#sectioning0">sectioning content</a> gives the header for that section. Subsequent headers of equal or higher <a href="#rank">rank</a> start new (implied) sections, headers of lower <a href="#rank">rank</a> start subsections that are part of the previous one. <del class="diff-old">Sectioning elements other than</del> <del class="diff-old">blockquote</del> <a href= "#sectioning0"><ins class="diff-chg">Sectioning content</ins></a> <ins class="diff-chg">elements</ins> are always considered subsections of their nearest ancestor element of <a href= "#sectioning0">sectioning <del class="diff-old">content,</del> <ins class="diff-chg">content</ins></a> , regardless of what implied sections other headings may have created. <del class= "diff-old">However,</del> <ins class="diff-chg">Certain elements are said to be</ins> <dfn id="sectioning1" title="sectioning root"><ins class= "diff-chg">sectioning roots</ins></dfn> ,<ins class= "diff-chg">including</ins> <code><a href= "#blockquote">blockquote</a></code> <del class="diff-old">elements are associated with implied sections. Effectively,</del> <ins class="diff-chg">and</ins> <code><del class= "diff-old">blockquote</del> <a href="#td"><ins class= "diff-chg">td</ins></a></code> <ins class="diff-new">elements. These</ins> elements <del class="diff-old">act like sections on</del> <ins class="diff-chg">can have their own outlines, but</ins> the <del class="diff-old">inside,</del> <ins class= "diff-chg">sections</ins> and <del class="diff-old">act opaquely on</del> <ins class="diff-chg">headers inside these elements do not contribute to</ins> the <del class="diff-old">outside.</del> <ins class="diff-chg">outlines of their ancestors.</ins> <div class="example"> For the following fragment: <pre> <body> <h1>Foo</h1> <h2>Bar</h2> <blockquote> <h3>Bla</h3> </blockquote> <p>Baz <h2>Quux</h2> <section> <h3>Thud</h3> </section> <p>Grunt </body> </pre> ...the structure would be: <ol> <li>Foo (heading of explicit <code><a href="#body0">body</a></code> <del class="diff-old">section)</del> <ins class="diff-chg">section, containing the "Grunt" paragraph)</ins> <ol> <li>Bar (heading starting implied <del class="diff-old">section) Bla (heading of explicit blockquote section) Baz (paragraph)</del> <ins class="diff-chg">section, containing a block quote and the "Baz" paragraph)</ins></li> <li>Quux (heading starting implied section)</li> <li>Thud (heading of explicit <code><a href= "#section">section</a></code> section)</li> </ol> <del class="diff-old">Grunt (paragraph)</del></li> </ol> Notice how the <code><del class="diff-old">blockquote nests inside an implicit section while the</del> <a href= "#section">section</a></code> <del class="diff-old">does not (and in fact,</del> ends the earlier implicit section so that a later paragraph <ins class="diff-new">("Grunt")</ins> is back at the top <del class="diff-old">level).</del> <ins class= "diff-chg">level.</ins> </div> Sections may contain headers of any <a href="#rank">rank</a> , but authors are strongly encouraged to either use only <code><a href="#h1">h1</a></code> elements, or to use elements of the appropriate <a href="#rank">rank</a> for the section's nesting level. Authors are also encouraged to <del class= "diff-old">explictly</del> <ins class="diff-chg">explicitly</ins> wrap sections in elements of <a href="#sectioning0">sectioning content</a> , instead of relying on the implicit sections generated by having multiple heading in one element of <a href= "#sectioning0">sectioning content</a> . <div class="example"> For example, the following is correct: <pre> <body> <h4>Apples</h4> <p>Apples are fruit. <section> <h2>Taste</h2> <p>They taste lovely. <h6>Sweet</h6> <p>Red apples are sweeter than green ones. <h1>Color</h1> <p>Apples come in various colors. </section> </body> </pre> However, the same document would be more clearly expressed as: <pre> <body> <h1>Apples</h1> <p>Apples are fruit. <section> <h2>Taste</h2> <p>They taste lovely. <section> <h3>Sweet</h3> <p>Red apples are sweeter than green ones. </section> </section> <section> <h2>Color</h2> <p>Apples come in various colors. </section> </body> </pre> Both of the documents above are semantically identical and would produce the same outline in compliant user agents. </div> <h5 id="outlines"><del class= "diff-old">3.8.11.1.</del> <ins class= "diff-chg">3.8.10.1.</ins> Creating an outline</h5> This section <del class="diff-old">will be rewritten at some point. The</del> <ins class="diff-chg">defines an</ins> algorithm <del class="diff-old">likely won't change, but its description will be dramatically simplified. Documents can be viewed as</del> <ins class="diff-chg">for creating an</ins> <dfn id= "outline"><ins class="diff-chg">outline</ins></dfn> <ins class= "diff-chg">for</ins> a <del class="diff-old">tree of sections, which defines how each</del> <a href="#sectioning0"><ins class= "diff-chg">sectioning content</ins></a> element <del class= "diff-old">in the tree</del> <ins class="diff-chg">or a</ins> <a href="#sectioning1"><ins class="diff-chg">sectioning root</ins></a> <ins class="diff-chg">element. It</ins> is <del class="diff-old">semantically related to the others,</del> <ins class="diff-chg">defined</ins> in terms of <del class= "diff-old">the overall section structure. This tree is related to the document tree, but there is not</del> a <del class= "diff-old">one-to-one relationship between elements in</del> <ins class="diff-chg">walk over</ins> the <ins class= "diff-new">nodes of a</ins> DOM <ins class="diff-new">tree, in tree order, with each node being visited when it is</ins> <ins class= "diff-new">entered</ins> and <ins class="diff-new">when it is</ins> <ins class="diff-new">exited</ins> <ins class= "diff-new">during</ins> the <del class="diff-old">document's sections.</del> <ins class="diff-chg">walk.</ins> The <del class="diff-old">tree of sections should be used when generating document outlines,</del> <ins class= "diff-chg">outline</ins> for <del class="diff-old">example when generating tables of contents. To derive the tree of sections from the document tree,</del> a <del class="diff-old">hypothetical tree is used, consisting of a view of the document tree containing only the elements of heading content and the elements of</del> <a href= "#sectioning0">sectioning content</a> <del class="diff-old">other than blockquote</del> <ins class="diff-chg">element or a</ins> <a href="#sectioning1"><ins class="diff-chg">sectioning root</ins></a> <del class="diff-old">. Descendants</del> <ins class="diff-chg">element consists</ins> of <del class= "diff-old">h1 - h6 , header ,</del> <ins class="diff-chg">a list of one or more potentially nested sections. Each section can have one heading associated with it. The algorithm for the outline also associates each node in the DOM tree with a particular section</ins> and <ins class="diff-new">potentially a heading. (The sections in the outline aren't</ins> <code><del class= "diff-old">blockquote</del> <a href="#section"><ins class= "diff-chg">section</ins></a></code> <ins class="diff-new">elements, though some may correspond to such</ins> elements <del class= "diff-old">must be removed from this view.</del> <ins class= "diff-chg">— they are merely conceptual sections.)</ins> The <del class="diff-old">hypothetical tree</del> <ins class= "diff-chg">algorithm that</ins> must be <ins class= "diff-new">followed during a walk of a DOM subtree</ins> rooted at <del class="diff-old">the root element or at an element of</del> <ins class="diff-chg">a</ins> <a href="#sectioning0">sectioning content <del class="diff-old">. In particular, while the sections inside blockquote</del></a> <del class="diff-old">s do not contribute</del> <ins class="diff-chg">element or a</ins> <a href= "#sectioning1"><ins class="diff-chg">sectioning root</ins></a> <ins class="diff-chg">element</ins> to <ins class= "diff-new">determine that element's outline is as follows:</ins> <ol> <li> <ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">current outlinee</ins></var> <ins class="diff-new">be null. (It holds</ins> the <del class="diff-old">document's tree of sections, blockquote s</del> <ins class="diff-chg">element whose outline is being created.)</ins> </li> <li> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">current section</ins></var> <ins class="diff-chg">be null. (It holds a pointer to a section, so that elements in the DOM</ins> can <del class="diff-old">have outlines of their own.</del> <ins class="diff-chg">all be associated with a section.)</ins> </li> <li> <del class="diff-old">UAs must take</del> <ins class= "diff-chg">Create a stack to hold elements, which is used to handle nesting. Initialize</ins> this <del class="diff-old">hypothetical tree (which will become</del> <ins class="diff-chg">stack to empty.</ins> </li> <li> <ins class="diff-chg">As you walk over</ins> the <del class= "diff-old">outline) and mutate it by walking it depth first</del> <ins class="diff-chg">DOM</ins> in <a href="#tree-order">tree order <del class="diff-old">and, for each element of heading content that is not</del></a> , <ins class="diff-chg">trigger</ins> the first <ins class="diff-new">relevant step below for each</ins> element <del class="diff-old">of its parent sectioning content element, inserting a new element of sectioning content ,</del> as <del class="diff-old">follows:</del> <ins class="diff-chg">you enter and exit it.</ins> <dl class="switch"> <dt>If the <del class="diff-old">element is a header element, or if it is an h1 - h6 node of rank equal to or higher than the first element in the parent element of sectioning content (assuming that is also an h1 - h6 node), or if the first element</del> <ins class= "diff-chg">top</ins> of the <del class="diff-old">parent element of sectioning content</del> <ins class="diff-chg">stack</ins> is an <ins class="diff-new">element, and you are exiting that</ins> element <del class="diff-old">of sectioning content :</del></dt> <dd><del class="diff-old">Insert the new</del> <ins class="diff-chg">The</ins> element <del class= "diff-old">of sectioning</del> <ins class="diff-chg">being exited is a</ins> <a href="#heading0"><ins class="diff-chg">heading</ins> content</a> <del class="diff-old">as the immediately following sibling of the parent</del> <ins class= "diff-chg">element.</ins> <ins class="diff-chg">Pop that</ins> element <del class= "diff-old">of sectioning content , and move all the elements</del> from the <del class="diff-old">current element</del> <ins class= "diff-chg">stack.</ins> </dd> <dt><ins class="diff-chg">If the top</ins> of <ins class= "diff-new">the stack is a</ins> <a href="#heading0">heading content</a> <del class="diff-old">up to the end of the parent</del> element <del class="diff-old">of</del></dt> <dd> <ins class="diff-chg">Do nothing.</ins> </dd> <dt><ins class="diff-chg">When entering a</ins> <a href= "#sectioning0">sectioning content</a> <del class="diff-old">into the new</del> element <del class="diff-old">of</del> <ins class= "diff-chg">or a</ins> <a href="#sectioning1">sectioning <del class= "diff-old">content . Otherwise:</del> <ins class= "diff-chg">root</ins></a> <ins class="diff-chg">element</ins></dt> <dd><del class="diff-old">Move</del> <ins class="diff-chg">If</ins> <var title=""><ins class= "diff-chg">current outlinee</ins></var> <ins class="diff-chg">is not null, push</ins> <var title=""><ins class="diff-chg">current outlinee</ins></var> <ins class="diff-chg">onto</ins> the <ins class="diff-new">stack.</ins> <ins class="diff-new">Let</ins> <var title="">current <del class="diff-old">heading element, and all subsequent siblings up to but excluding</del> <ins class= "diff-chg">outlinee</ins></var> <ins class="diff-chg">be</ins> the <del class="diff-old">next</del> element <del class="diff-old">of sectioning content , header element, or h1 - h6 of equal or higher rank , whichever comes first, into</del> <ins class="diff-chg">that is being entered.</ins> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">current section</ins></var> <ins class="diff-chg">be a newly created section for</ins> the <var title=""><ins class= "diff-new">current outlinee</ins></var> <ins class= "diff-new">element.</ins> <ins class="diff-new">Let there be a</ins> new <del class= "diff-old">element of sectioning content , then insert</del> <ins class="diff-chg">outline for</ins> the new <del class= "diff-old">element of sectioning content where</del> <var title= ""><ins class="diff-chg">current outlinee</ins></var> ,<ins class= "diff-chg">initialized with just</ins> the <ins class= "diff-new">new</ins> <var title="">current <del class= "diff-old">header was. The outline is then</del> <ins class= "diff-chg">section</ins></var> <ins class="diff-chg">as</ins> the <del class="diff-old">resulting hypothetical tree. The ranks of</del> <ins class="diff-chg">only section in</ins> the <del class="diff-old">headers become irrelevant at this point: each element of</del> <ins class="diff-chg">outline.</ins> </dd> <dt><ins class="diff-chg">When exiting a</ins> <a href= "#sectioning0">sectioning content</a> <del class= "diff-old">in</del> <ins class="diff-chg">element, if</ins> the <del class="diff-old">hypothetical tree contains either no or one heading element child. If there</del> <ins class= "diff-chg">stack</ins> is <del class="diff-old">one, then it gives the section's heading, of there isn't, the section has no heading.</del> <ins class="diff-chg">not empty</ins></dt> <dd> <del class="diff-old">Sections are nested as in</del> <ins class="diff-chg">Pop</ins> the <del class= "diff-old">hypothetical tree. If a sectioning</del> <ins class= "diff-chg">top</ins> element <del class="diff-old">is a child of another, that means it is a subsection of</del> <ins class= "diff-chg">from the stack, and let the</ins> <var title= ""><ins class="diff-chg">current outlinee</ins></var> <ins class= "diff-chg">be</ins> that <del class="diff-old">other section.</del> <ins class="diff-chg">element.</ins> <del class="diff-old">When creating an interactive table of contents, entries should jump the user to</del> <ins class= "diff-chg">Let</ins> <var title=""><ins class="diff-chg">current section</ins></var> <ins class="diff-chg">be</ins> the <del class= "diff-old">relevant</del> <ins class="diff-chg">last</ins> section <del class="diff-old">element, if it was a real element</del> in the <del class="diff-old">original document, or to the heading, if the section element was one</del> <ins class= "diff-chg">outline</ins> of <del class="diff-old">those created during</del> the <del class="diff-old">above process. Selecting</del> <var title=""><ins class="diff-chg">current outlinee</ins></var> <ins class="diff-chg">element.</ins> <ins class="diff-chg">Append</ins> the <del class= "diff-old">first section</del> <ins class="diff-chg">outline</ins> of the <del class="diff-old">document therefore always takes the user</del> <a href="#sectioning0"><ins class="diff-chg">sectioning content</ins></a> <ins class="diff-chg">element being exited</ins> to the <del class="diff-old">top of the document, regardless of where</del> <var title=""><ins class="diff-chg">current section</ins></var> .<ins class="diff-chg">(This does not change which section is</ins> the <del class="diff-old">first header</del> <ins class="diff-chg">last section</ins> in the <del class= "diff-old">body is to be found.</del> <ins class= "diff-chg">outline.)</ins> <del class="diff-old">The hypothetical tree (before mutations) could be generated by creating</del></dd> <dt><ins class="diff-chg">When exiting</ins> a <del class= "diff-old">TreeWalker with the following NodeFilter (described here as an anonymous ECMAScript function). [DOMTR] [ECMA262]</del> <a href="#sectioning1"><ins class="diff-chg">sectioning root</ins></a> <ins class="diff-chg">element, if the stack is not empty</ins></dt> <dd> <ins class="diff-chg">Run these steps:</ins> <del class="diff-old">function (n) { // This implementation only knows about HTML elements. // An implementation that supports other languages might be // different. // Reject anything that isn't an element. if (n.nodeType != Node.ELEMENT_NODE) return NodeFilter.FILTER_REJECT; // Skip any descendants of headings. if ((n.parentNode && n.parentNode.namespaceURI == 'http://www.w3.org/1999/xhtml') && (n.parentNode.localName == 'h1' || n.parentNode.localName == 'h2' || n.parentNode.localName == 'h3' || n.parentNode.localName == 'h4' || n.parentNode.localName == 'h5' || n.parentNode.localName == 'h6' || n.parentNode.localName == 'header')) return NodeFilter.FILTER_REJECT; // Skip any blockquotes. if ((n.namespaceURI == 'http://www.w3.org/1999/xhtml') && (n.localName == 'blockquote')) return NodeFilter.FILTER_REJECT; // Accept HTML elements in the list given in the prose above. if ((n.namespaceURI == 'http://www.w3.org/1999/xhtml') && (n.localName == 'body' || /*n.localName == 'blockquote' ||*/ n.localName == 'section' || n.localName == 'nav' || n.localName == 'article' || n.localName == 'aside' || n.localName == 'h1' || n.localName == 'h2' || n.localName == 'h3' || n.localName == 'h4' || n.localName == 'h5' || n.localName == 'h6' || n.localName == 'header')) return NodeFilter.FILTER_ACCEPT; // Skip the rest. return NodeFilter.FILTER_SKIP; } 3.8.11.2. Determining which heading and section applies to a particular node This section will be rewritten at some point. The algorithm likely won't change, but its description will be dramatically simplified.</del> <ol> <li> <del class="diff-old">Given a particular node, user agents must use</del> <ins class="diff-chg">Pop</ins> the <del class= "diff-old">following algorithm, in</del> <ins class="diff-chg">top element from</ins> the <del class="diff-old">given order , to determine which heading</del> <ins class="diff-chg">stack,</ins> and <del class="diff-old">section the node is most closely associated with. The processing of this algorithm must stop as soon as</del> <ins class="diff-chg">let</ins> the <del class= "diff-old">associated section and heading are established (even if they are established to</del> <var title=""><ins class= "diff-chg">current outlinee</ins></var> be <del class= "diff-old">nothing).</del> <ins class="diff-chg">that element.</ins> </li> <li><del class="diff-old">If</del> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">current section</ins></var> <ins class= "diff-chg">be</ins> the <del class="diff-old">node has an ancestor that is a header element, then</del> <ins class="diff-chg">last section in</ins> the <del class="diff-old">associated heading is</del> <ins class="diff-chg">outline of</ins> the <del class= "diff-old">most distant such ancestor. The associated section is that header 's associated section (i.e. repeat this algorithm for that header ).</del> <var title=""><ins class="diff-chg">current outlinee</ins></var> <ins class="diff-chg">element.</ins> </li> <li> <ins class="diff-new">Loop:</ins> If <del class= "diff-old">the node</del> <var title=""><ins class= "diff-chg">current section</ins></var> has <del class="diff-old">an ancestor that is an h1 - h6 element, then the associated heading is</del> <ins class="diff-chg">no child sections, stop these steps.</ins> </li> <li> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">current section</ins></var> <ins class= "diff-chg">be</ins> the <del class="diff-old">most distant such ancestor. The associated</del> <ins class="diff-chg">last child</ins> section <del class="diff-old">is that heading's</del> <ins class="diff-chg">of the current</ins> <var title= ""><ins class="diff-chg">current</ins> section <del class= "diff-old">(i.e. repeat this algorithm for that heading element).</del></var> . </li> <li><del class="diff-old">If</del> <ins class="diff-chg">Go back to</ins> the <del class= "diff-old">node is an h1 - h6</del> <ins class="diff-chg">substep labeled</ins> <ins class="diff-chg">Loop</ins> . </li> </ol> </dd> <dt><ins class="diff-chg">When exiting a</ins> <a href= "#sectioning0"><ins class="diff-chg">sectioning content</ins></a> element or a <del class="diff-old">header</del> <a href= "#sectioning1"><ins class="diff-chg">sectioning root</ins></a> <del class="diff-old">element, then the associated heading is the</del> element <del class="diff-old">itself.</del></dt> <dd> The <del class="diff-old">UA must then generate</del> <var title=""><ins class="diff-chg">current outlinee</ins></var> <ins class="diff-chg">is</ins> the <del class= "diff-old">hypothetical</del> <ins class="diff-chg">element being exited.</ins> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">current</ins> section <del class="diff-old">tree described in the previous section, rooted at</del></var> <ins class="diff-chg">be</ins> the <del class= "diff-old">nearest</del> <ins class="diff-chg">first</ins> section <del class="diff-old">ancestor (or the root element if there is no such ancestor). If</del> <ins class="diff-chg">in</ins> the <del class="diff-old">parent</del> <ins class= "diff-chg">outline</ins> of the <del class="diff-old">heading in that hypothetical tree is an element in</del> <var title= ""><ins class="diff-chg">current outlinee</ins></var> <ins class= "diff-chg">element.</ins> <ins class="diff-chg">Skip to</ins> the <del class= "diff-old">real document tree, then that element is</del> <ins class="diff-chg">next step in</ins> the <del class= "diff-old">associated section. Otherwise, there</del> <ins class= "diff-chg">overall set of steps. (The walk</ins> is <del class= "diff-old">no associated section element.</del> <ins class= "diff-chg">over.)</ins> </dd> <dt>If the <del class="diff-old">node</del> <var title= ""><ins class="diff-chg">current outlinee</ins></var> is <del class="diff-old">an element of sectioning</del> <ins class= "diff-chg">null.</ins></dt> <dd> <ins class="diff-chg">Do nothing.</ins> </dd> <dt><ins class="diff-chg">When entering a</ins> <a href= "#heading0"><ins class="diff-chg">heading</ins> content <del class= "diff-old">, then</del></a> <ins class= "diff-chg">element</ins></dt> <dd> <ins class="diff-chg">If</ins> the <del class= "diff-old">associated</del> <var title=""><ins class= "diff-chg">current</ins> section <del class="diff-old">is itself. The UA must then generate</del></var> <ins class="diff-chg">has no heading, let</ins> the <del class="diff-old">hypothetical section tree described in</del> <ins class="diff-chg">element being entered be</ins> the <del class="diff-old">previous section, rooted at</del> <ins class="diff-chg">heading for</ins> the <var title= ""><ins class="diff-new">current</ins> section <del class= "diff-old">itself. If</del></var> . <ins class="diff-chg">Otherwise, if</ins> the <del class= "diff-old">section element, in that hypothetical tree,</del> <ins class="diff-chg">element being entered</ins> has a <del class= "diff-old">child element that is an h1 - h6 element</del> <ins class="diff-chg">rank equal to</ins> or <del class= "diff-old">a header element, then that element is</del> <ins class= "diff-chg">greater than</ins> the <del class="diff-old">associated heading. Otherwise, there is no associated</del> heading <del class="diff-old">element. If</del> <ins class= "diff-chg">of</ins> the <del class="diff-old">node is a footer or address element,</del> <var title=""><ins class="diff-chg">current section</ins></var> , then <del class="diff-old">the associated</del> <ins class="diff-chg">create a new</ins> section <del class="diff-old">is</del> <ins class="diff-chg">and append it to</ins> the <del class="diff-old">nearest ancestor element</del> <ins class="diff-chg">outline</ins> of <del class= "diff-old">sectioning content , if there is one. The node's associated heading is</del> the <del class="diff-old">same as</del> <var title=""><ins class="diff-chg">current outlinee</ins></var> <ins class="diff-chg">element, so</ins> that <del class= "diff-old">element of sectioning content 's associated heading (i.e. repeat</del> this <del class="diff-old">algorithm for that element of sectioning content ). If there</del> <ins class= "diff-chg">new section</ins> is <del class="diff-old">no ancestor element</del> <ins class="diff-chg">the new last section</ins> of <del class="diff-old">sectioning content ,</del> <ins class= "diff-chg">that outline. Let</ins> <var title=""><ins class= "diff-chg">current section</ins></var> <ins class="diff-chg">be that new section. Let</ins> the element <del class="diff-old">has no associated section nor an associated heading. Otherwise,</del> <ins class="diff-chg">being entered be</ins> the <del class= "diff-old">node is just a normal node, and</del> <ins class= "diff-chg">new heading for</ins> the <del class="diff-old">document has to</del> <var title=""><ins class="diff-chg">current section</ins></var> . <ins class="diff-chg">Otherwise, run these substeps:</ins> <ol> <li> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">candidate section</ins></var> be <del class= "diff-old">examined more closely to determine its</del> <var title= ""><ins class="diff-chg">current</ins> section <del class= "diff-old">and heading. Create a view rooted at the nearest ancestor element of sectioning content (or</del></var> . </li> <li> <ins class="diff-chg">If</ins> the <del class= "diff-old">root</del> element <del class="diff-old">if there is none) that</del> <ins class="diff-chg">being entered</ins> has <del class="diff-old">just h1 - h6 elements, header elements, the node itself, and elements of sectioning content other</del> <ins class="diff-chg">a rank lower</ins> than <del class= "diff-old">blockquote elements. (Descendants of any</del> <ins class="diff-chg">the rank</ins> of the <del class= "diff-old">nodes in this view can be ignored, as can any node later in</del> <ins class="diff-chg">heading of</ins> the <del class= "diff-old">tree than</del> <var title=""><ins class= "diff-chg">candidate section</ins></var> ,<ins class= "diff-chg">then create a new section, and append it to</ins> <var title=""><ins class="diff-chg">candidate section</ins></var> .<ins class="diff-chg">(This does not change which section is</ins> the <del class="diff-old">node</del> <ins class="diff-chg">last section</ins> in <del class="diff-old">question, as</del> the <del class="diff-old">algorithm below merely walks backwards up this view.)</del> <ins class="diff-chg">outline.)</ins> Let <var title=""><del class="diff-old">n</del> <ins class= "diff-chg">current section</ins></var> be <del class="diff-old">an iterator for</del> this <del class="diff-old">view, initialised at the node in question.</del> <ins class="diff-chg">new section.</ins> Let <del class="diff-old">c</del> <ins class= "diff-chg">the element being entered</ins> be the <del class= "diff-old">current best candidate heading, initially null, and initially not used. It is used when top-level</del> <ins class= "diff-chg">new</ins> heading <del class="diff-old">candidates are to be searched</del> for <del class="diff-old">(see below). Repeat these steps (which effectively goes backwards through</del> the <del class="diff-old">node's previous siblings) until an answer is found:</del> <var title=""><ins class="diff-chg">current section</ins></var> .<ins class="diff-chg">Abort these substeps.</ins> </li> <li><del class="diff-old">If</del> <ins class="diff-chg">Let</ins> <var title=""><del class= "diff-old">n</del> <ins class="diff-chg">candidate section</ins></var> <del class="diff-old">points to a node with no</del> <ins class="diff-chg">be the section that contains the</ins> previous <del class="diff-old">sibling, and</del> <var title=""><del class="diff-old">c</del> <ins class= "diff-chg">candidate section</ins></var> <del class="diff-old">is null, then return</del> <ins class="diff-chg">in</ins> the <del class="diff-old">node's parent node as</del> <ins class= "diff-chg">outline of</ins> <var title=""><ins class= "diff-chg">current outlinee</ins></var> . </li> <li> <ins class="diff-chg">Return to step 2.</ins> </li> </ol> <ins class="diff-chg">Push</ins> the <del class= "diff-old">answer. If</del> <ins class="diff-chg">element being entered onto</ins> the <del class="diff-old">node has no parent</del> <ins class="diff-chg">stack. (This causes the algorithm to skip any descendants of the element.)</ins> </dd> <dt><ins class="diff-chg">Otherwise</ins></dt> <dd> <ins class="diff-chg">Do nothing.</ins> </dd> </dl> <ins class="diff-chg">In addition, whenever you exit a</ins> node, <del class="diff-old">return null as</del> <ins class="diff-chg">after doing</ins> the <del class= "diff-old">answer. Otherwise,</del> <ins class="diff-chg">steps above,</ins> if <var title=""><del class="diff-old">n</del> <ins class="diff-chg">current section</ins></var> <del class= "diff-old">points to a</del> <ins class="diff-chg">is not null, associate the</ins> node with <del class="diff-old">no previous sibling, return c as</del> the <del class="diff-old">answer. Adjust</del> <ins class="diff-chg">section</ins> <var title= ""><del class="diff-old">n so that it points to the previous sibling of the</del> current <del class="diff-old">position.</del> <ins class="diff-chg">section</ins></var> . </li> <li> If <ins class="diff-new">the</ins> <var title=""><del class= "diff-old">n</del> <ins class="diff-chg">current outlinee</ins></var> is <del class="diff-old">pointing at an h1</del> <ins class="diff-chg">null, then there was no</ins> <a href="#sectioning0"><ins class="diff-chg">sectioning content</ins></a> <ins class="diff-chg">element</ins> or <del class="diff-old">header</del> <a href= "#sectioning1"><ins class="diff-chg">sectioning root</ins></a> <del class="diff-old">element, then return that</del> element <del class="diff-old">as</del> <ins class="diff-chg">in</ins> the <del class="diff-old">answer. If n</del> <ins class="diff-chg">DOM. There</ins> is <del class="diff-old">pointing at an h2 - h6 element, and heading candidates are not being searched for, then return</del> <ins class="diff-chg">no outline. Abort these steps.</ins> </li> <li> <ins class="diff-chg">Associate any nodes</ins> that <del class= "diff-old">element as</del> <ins class="diff-chg">were not associated a section in</ins> the <del class="diff-old">answer. Otherwise, if n is pointing at an h2 - h6 element, and either c is still null, or</del> <ins class="diff-chg">steps above with</ins> <var title=""><del class="diff-old">c</del> <ins class= "diff-chg">current outlinee</ins></var> <del class="diff-old">is a</del> <ins class="diff-chg">as their section.</ins> </li> <li> <ins class="diff-chg">Associate all nodes with the</ins> heading of <del class="diff-old">lower rank than this one, then set c to be this element, and continue going backwards through</del> the <del class="diff-old">previous siblings.</del> <ins class= "diff-chg">section which which they are associated, if any.</ins> </li> <li> If <var title=""><del class="diff-old">n</del> <ins class= "diff-chg">current outlinee</ins></var> is <del class= "diff-old">pointing at an</del> <a href="#the-body1"><ins class= "diff-chg">the</ins> <code><ins class="diff-chg">body</ins></code> element <del class="diff-old">of sectioning content</del></a> , then <del class="diff-old">from this point on top-level heading candidates are being searched for. (Specifically, we are looking for</del> the <del class="diff-old">nearest top-level header</del> <ins class="diff-chg">outline created</ins> for <ins class= "diff-new">that element is</ins> the <del class="diff-old">current section.) Continue going backwards through</del> <ins class= "diff-chg">outline of</ins> the <del class="diff-old">previous siblings.</del> <ins class="diff-chg">entire document.</ins> </li> </ol> <del class="diff-old">If the answer from the previous step (the loop) is null, which can only happen if</del> <ins class="diff-chg">The tree of sections created by</ins> the <del class="diff-old">node has no preceeding headings and is not contained in</del> <ins class="diff-chg">algorithm above, or a proper subset thereof, must be used when generating document outlines, for example when generating tables of contents.</ins> <ins class="diff-chg">When creating</ins> an <del class= "diff-old">element</del> <ins class="diff-chg">interactive table</ins> of <del class="diff-old">sectioning content , then there is no associated heading and no associated section. Otherwise, if</del> <ins class="diff-chg">contents, entries should jump</ins> the <del class="diff-old">answer from</del> <ins class= "diff-chg">user to</ins> the <del class="diff-old">earlier loop step is an element of</del> <ins class="diff-chg">relevant</ins> <a href="#sectioning0">sectioning content <del class="diff-old">, then</del></a> <ins class="diff-chg">element, if</ins> the <del class="diff-old">associated</del> section <del class= "diff-old">is that</del> <ins class="diff-chg">was created for a real</ins> element <del class="diff-old">and</del> <ins class= "diff-chg">in</ins> the <del class="diff-old">associated</del> <ins class="diff-chg">original document, or to the relevant</ins> <a href="#heading0">heading <del class="diff-old">is that element of sectioning</del> content</a> <del class="diff-old">'s associated heading (i.e. repeat this algorithm for that section). Otherwise,</del> <ins class="diff-chg">element,</ins> if the <del class="diff-old">answer from that same earlier step is an h1 - h6 element or</del> <ins class="diff-chg">section in the tree was generated for</ins> a <ins class="diff-new">heading in the above process.</ins> <ins class="diff-new">Selecting the first section of the document therefore always takes the user to the top of the document, regardless of where the first header in the</ins> <code><del class="diff-old">header</del> <a href= "#body0"><ins class="diff-chg">body</ins></a></code> <del class= "diff-old">element, then the associated heading</del> is <del class="diff-old">that element and</del> <ins class= "diff-chg">to be found.</ins> <div class="note"> <ins class="diff-chg">The following JavaScript function shows how</ins> the <del class="diff-old">associated section is that heading element's associated section (i.e. repeat this algorithm for that heading). Not all nodes have an associated header or section. For example, if a section</del> <ins class="diff-chg">tree walk could be implemented. The</ins> <var title=""><ins class= "diff-chg">root</ins></var> <ins class="diff-chg">argument</ins> is <del class="diff-old">implied, as when multiple headers are found in one element</del> <ins class="diff-chg">the root</ins> of <del class="diff-old">sectioning content , then a node in that section has an anonymous associated section (its section is not represented by a real element),</del> <ins class="diff-chg">the tree to walk,</ins> and the <del class="diff-old">algorithm above does not associate</del> <var title=""><ins class= "diff-chg">enter</ins></var> <ins class="diff-chg">and</ins> <var title=""><ins class="diff-chg">exit</ins></var> <ins class= "diff-chg">arguments are callbacks</ins> that <del class= "diff-old">node</del> <ins class="diff-chg">are called</ins> with <del class="diff-old">any particular element of sectioning content . For</del> the <del class="diff-old">following fragment: <body> <h1>X</h1> <h2>X</h2> <blockquote> <h3>X</h3> </blockquote> <p id="a">X <h4>Text Node A</h4> <section> <h5>X</h5> </section> <p>Text Node B </body> The associations are</del> <ins class="diff-chg">nodes</ins> as <del class= "diff-old">follows (not all associations</del> <ins class= "diff-chg">they</ins> are <del class="diff-old">shown): Node Associated heading Associated section <body> <h1> <body> <h1> <h1> <body> <h2> <h2> None. <blockquote> <h2> None. <h3> <h3> <blockquote> <p id="a"> <h2> None. Text Node A <h4> None. Text Node B <h1></del> <ins class="diff-chg">entered and exited.</ins> <a href= "#references"><ins class="diff-chg">[ECMA262]</ins></a> <del class= "diff-old"><body></del> <pre> function (root, enter, exit) { <ins class="diff-chg"> var node = root; start: do while (node) { enter(node); if (node.firstChild) { node = node.firstChild; continue start; } while (node) { exit(node); if (node.nextSibling) { node = node.nextSibling; continue start; } if (node == root) node = null; else node = node.parentNode; } } } </ins> </pre></div> <h5 id="distinguishing"><del class= "diff-old">3.8.11.3.</del> <ins class= "diff-chg">3.8.10.2.</ins> Distinguishing site-wide <del class="diff-old">headers</del> <ins class= "diff-chg">headings</ins> from page <del class= "diff-old">headers</del> <ins class="diff-chg">headings</ins></h5> Given the <del class="diff-old">hypothetical section tree ,</del> <a href="#outline"><ins class="diff-chg">outline</ins></a> <ins class="diff-chg">of a document,</ins> but ignoring any sections created for <code><a href="#nav">nav</a></code> and <code><a href="#aside">aside</a></code> elements, and any of their descendants, if the <ins class="diff-new">only</ins> root of the tree is <a href="#the-body1">the <code>body</code> element</a> 's section, and it has only a single subsection which is created by an <code><a href="#article">article</a></code> element, then the <del class="diff-old">header</del> <ins class= "diff-chg">heading</ins> of <a href="#the-body1">the <code>body</code> element</a> should be assumed to be a site-wide <del class="diff-old">header,</del> <ins class= "diff-chg">heading,</ins> and the <del class= "diff-old">header</del> <ins class="diff-chg">heading</ins> of the <code><a href="#article">article</a></code> element should be assumed to be the page's <del class="diff-old">header.</del> <ins class="diff-chg">heading.</ins> If a page starts with a heading that is common to the whole site, the document must be authored such that, in the document's <del class="diff-old">hypothetical section tree</del> <a href= "#outline"><ins class="diff-chg">outline</ins></a> , ignoring any sections created for <code><a href="#nav">nav</a></code> and <code><a href="#aside">aside</a></code> elements and any of their descendants, the <del class="diff-old">root of the</del> tree <del class="diff-old">is</del> <ins class="diff-chg">has only one root section,</ins> <a href="#the-body1">the <code>body</code> element</a> 's section, its heading is the site-wide heading, <a href="#the-body1">the <code>body</code> element</a> has just one subsection, that subsection is created by an <code><a href= "#article">article</a></code> element, and that <code><a href= "#article">article</a></code> 's <del class="diff-old">header</del> <ins class="diff-chg">heading</ins> is the page heading. If a page does not contain a site-wide heading, then the page must be authored such that, in the document's <del class= "diff-old">hypothetical section tree</del> <a href= "#outline"><ins class="diff-chg">outline</ins></a> , ignoring any sections created for <code><a href="#nav">nav</a></code> and <code><a href="#aside">aside</a></code> elements and any of their descendants, either <a href="#the-body1">the <code>body</code> element</a> has no subsections, or it has more than one subsection, or it has a single subsection but that subsection is not created by an <code><a href="#article">article</a></code> <del class= "diff-old">element.</del> <ins class="diff-chg">element, or there is more than one section at the root of the outline.</ins> Conceptually, a site is thus a document with many articles — when those articles are split into many pages, the heading of the original single page becomes the heading of the site, repeated on every page. <h3 id="grouping"><del class= "diff-old">3.9.</del> <ins class="diff-chg">3.9</ins> <del class="diff-old">Prose</del> <ins class="diff-chg">Grouping content</ins></h3> <h4 id="the-p"><del class= "diff-old">3.9.1.</del> <ins class="diff-chg">3.9.1</ins> The <dfn id="p"><code>p</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#p">p</a></code> element represents a <a href="#paragraph">paragraph</a> . <div class="example"> The following examples are conforming HTML fragments: <pre> <p>The little kitten gently seated himself on a piece of carpet. Later in his life, this would be referred to as the time the cat sat on the mat. </pre> <pre> <fieldset> <legend>Personal information</legend> <p> <label>Name: <input name="n"></label> <label><input name="anon" type="checkbox"> Hide from other users</label> </p> <p><label>Address: <textarea name="a"></textarea></label></p> </fieldset> </pre> <pre> <p>There was once an example from Femley,<br> Whose markup was of dubious quality. The validator complained,<br> So the author was pained,<br> To move the error from the markup to the rhyming. </pre></div> The <code><a href="#p">p</a></code> element should not be used when a more specific element is more appropriate. <div class="example"> The following example is technically correct: <pre> <section> <!-- ... --> <p>Last modified: 2001-04-23 <p>Author: fred@example.com </section> </pre> However, it would be better marked-up as: <pre> <section> <!-- ... --> <footer>Last modified: 2001-04-23</footer> <address>Author: fred@example.com</address> </section> </pre> Or: <pre> <section> <!-- ... --> <footer> <p>Last modified: 2001-04-23 <address>Author: fred@example.com</address> </footer> </section> </pre></div> <h4 id="the-hr"><del class= "diff-old">3.9.2.</del> <ins class="diff-chg">3.9.2</ins> The <dfn id="hr"><code>hr</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd>Empty.</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#hr">hr</a></code> element represents a <a href="#paragraph">paragraph</a> -level thematic break, e.g. a scene change in a story, or a transition to another topic within a section of a reference book. <h4 id="the-br"><del class= "diff-old">3.9.3.</del> <ins class="diff-chg">3.9.3</ins> The <dfn id="br"><code>br</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd>Empty.</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#br">br</a></code> element represents a line break. <code><a href="#br">br</a></code> elements must be empty. Any content inside <code><a href="#br">br</a></code> elements must not be considered part of the surrounding text. <code><a href="#br">br</a></code> elements must <del class= "diff-old">only</del> be used <ins class="diff-new">only</ins> for line breaks that are actually part of the content, as in poems or addresses. <div class="example"> The following example is correct usage of the <code><a href= "#br">br</a></code> element: <pre> <p>P. Sherman 42 Wallaby Way Sydney </pre></div> <code><a href="#br">br</a></code> elements must not be used for separating thematic groups in a paragraph. <div class="example"> The following examples are non-conforming, as they abuse the <code><a href="#br">br</a></code> element: <pre> <p><a ...>34 comments.</a><br> <a ...>Add a comment.<a></p> </pre> <pre> <p>Name: <input name="name"><br> Address: <input name="address"></p> </pre> Here are alternatives to the above, which are correct: <pre> <p><a ...>34 comments.</a></p> <p><a ...>Add a comment.<a></p> </pre> <pre> <p>Name: <input name="name"></p> <p>Address: <input name="address"></p> </pre></div> If a <a href="#paragraph">paragraph</a> consists of nothing but a single <code><a href="#br">br</a></code> element, it represents a placeholder blank line (e.g. as in a template). Such blank lines must not be used for presentation purposes. <h4 id="the-pre"><ins class= "diff-new">3.9.4</ins> <ins class="diff-new">The</ins> <dfn id="pre"><code><ins class="diff-new">pre</ins></code></dfn> <ins class="diff-new">element</ins></h4> <dl class="element"> <dt><ins class="diff-new">Categories</ins></dt> <dd><a href="#flow-content0"><ins class="diff-new">Flow content</ins></a> .</dd> <dt><ins class="diff-new">Contexts in which this element may be used:</ins></dt> <dd><ins class="diff-new">Where</ins> <a href= "#flow-content0"><ins class="diff-new">flow content</ins></a> <ins class="diff-new">is expected.</ins></dd> <dt><ins class="diff-new">Content model:</ins></dt> <dd><a href="#phrasing0"><ins class="diff-new">Phrasing content</ins></a> .</dd> <dt><ins class="diff-new">Element-specific attributes:</ins></dt> <dd><ins class="diff-new">None.</ins></dd> <dt><ins class="diff-new">DOM interface:</ins></dt> <dd><ins class="diff-new">Uses</ins> <code><a href= "#htmlelement"><ins class="diff-new">HTMLElement</ins></a></code> .</dd> </dl> <ins class="diff-new">The</ins> <code><a href="#pre"><ins class= "diff-new">pre</ins></a></code> <ins class="diff-new">element represents a block of preformatted text, in which structure is represented by typographic conventions rather than by elements.</ins> <ins class="diff-new">In the</ins> <ins class="diff-new">HTML serialization</ins> ,<ins class="diff-new">a leading newline character immediately following the</ins> <code><a href= "#pre"><ins class="diff-new">pre</ins></a></code> <ins class= "diff-new">element start tag is stripped.</ins> <ins class="diff-new">Some examples of cases where the</ins> <code><a href="#pre"><ins class="diff-new">pre</ins></a></code> <ins class="diff-new">element could be used:</ins> <ul> <li><ins class="diff-new">Including an e-mail, with paragraphs indicated by blank lines, lists indicated by lines prefixed with a bullet, and so on.</ins></li> <li><ins class="diff-new">Including fragments of computer code, with structure indicated according to the conventions of that language.</ins></li> <li><ins class="diff-new">Displaying ASCII art.</ins></li> </ul> <ins class="diff-new">To represent a block of computer code, the</ins> <code><a href="#pre"><ins class= "diff-new">pre</ins></a></code> <ins class="diff-new">element can be used with a</ins> <code><a href="#code"><ins class= "diff-new">code</ins></a></code> <ins class="diff-new">element; to represent a block of computer output the</ins> <code><a href= "#pre"><ins class="diff-new">pre</ins></a></code> <ins class= "diff-new">element can be used with a</ins> <code><a href= "#samp"><ins class="diff-new">samp</ins></a></code> <ins class= "diff-new">element. Similarly, the</ins> <code><a href= "#kbd"><ins class="diff-new">kbd</ins></a></code> <ins class= "diff-new">element can be used within a</ins> <code><a href= "#pre"><ins class="diff-new">pre</ins></a></code> <ins class= "diff-new">element to indicate text that the user is to enter.</ins> <div class="example"> <ins class="diff-new">In the following snippet, a sample of computer code is presented.</ins> <pre> <p>This is the <code>Panel</code> constructor:</p><ins class="diff-new"> <pre><code>function Panel(element, canClose, closeHandler) { this.element = element; this.canClose = canClose; this.closeHandler = function () { if (closeHandler) closeHandler() }; }</code> </pre> </ins> </pre></div> <div class="example"> <ins class="diff-new">In the following snippet,</ins> <code><a href="#samp"><ins class="diff-new">samp</ins></a></code> <ins class="diff-new">and</ins> <code><a href="#kbd"><ins class= "diff-new">kbd</ins></a></code> <ins class="diff-new">elements are mixed in the contents of a</ins> <code><a href="#pre"><ins class= "diff-new">pre</ins></a></code> <ins class="diff-new">element to show a session of Zork I.</ins> <pre> <pre><samp>You are in an open field west of a big white house with a boarded<ins class="diff-new"> front door. There is a small mailbox here. ></samp> <kbd>open mailbox</kbd> <samp>Opening the mailbox reveals: A leaflet. > </samp> </pre> </ins> </pre></div> <div class="example"> <ins class="diff-new">The following shows a contemporary poem that uses the</ins> <code><a href="#pre"><ins class= "diff-new">pre</ins></a></code> <ins class="diff-new">element to preserve its unusual formatting, which forms an intrinsic part of the poem itself.</ins> <pre> <pre> maxling<ins class="diff-new"> it is with a heart heavy that i admit loss of a feline so loved a friend lost to the unknown (night) ~cdr 11dec07</pre> </ins> </pre></div> <h4 id="the-dialog"><del class= "diff-old">3.9.4.</del> <ins class="diff-chg">3.9.5</ins> The <dfn id="dialog"><code>dialog</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd>Zero or more pairs of <ins class="diff-new">one</ins> <code><a href="#dt">dt</a></code> <del class="diff-old">and</del> <ins class="diff-chg">element followed by one</ins> <code><a href= "#dd">dd</a></code> <del class="diff-old">elements.</del> <ins class="diff-chg">element.</ins></dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#dialog">dialog</a></code> element represents a conversation. Each part of the conversation must have an explicit talker (or speaker) given by a <code><a href="#dt">dt</a></code> element, and a discourse (or quote) given by a <code><a href="#dd">dd</a></code> element. <div class="example"> This example demonstrates this using an extract from Abbot and Costello's famous sketch, <cite>Who's on first</cite> : <pre> <dialog> <dt> Costello <dd> Look, you gotta first baseman? <dt> Abbott <dd> Certainly. <dt> Costello <dd> Who's playing first? <dt> Abbott <dd> That's right. <dt> Costello <dd> When you pay off the first baseman every month, who gets the money? <dt> Abbott <dd> Every dollar of it. </dialog> </pre></div> Text in a <code><a href="#dt">dt</a></code> element in a <code><a href="#dialog">dialog</a></code> element is implicitly the source of the text given in the following <code><a href="#dd">dd</a></code> element, and the contents of the <code><a href="#dd">dd</a></code> element are implicitly a quote from that speaker. There is thus no need to include <code><a href= "#cite2">cite</a></code> , <code><a href="#q">q</a></code> , or <code><a href="#blockquote">blockquote</a></code> elements in this markup. Indeed, a <code><a href="#q">q</a></code> element inside a <code><a href="#dd">dd</a></code> element in a conversation would actually imply the people talking were themselves quoting <del class="diff-old">someone else.</del> <ins class= "diff-chg">another work.</ins> See the <code><a href= "#cite2">cite</a></code> , <code><a href="#q">q</a></code> , and <code><a href="#blockquote">blockquote</a></code> elements for other ways to cite or quote. <del class="diff-old">3.10. Preformatted text</del> <h4 id="the-blockquote"><del class= "diff-old">3.10.1.</del> <ins class="diff-chg">3.9.6</ins> The <dfn id="blockquote"><code><del class="diff-old">pre</del> <ins class="diff-chg">blockquote</ins></code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dd><a href="#sectioning1"><ins class="diff-new">Sectioning root</ins></a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Phrasing</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><del class="diff-old">None.</del> <code title= "attr-blockquote-cite"><a href="#cite"><ins class= "diff-chg">cite</ins></a></code></dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <pre> <ins class="diff-chg"> class=idl>interface <dfn id= "htmlquoteelement">HTMLQuoteElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute DOMString <a href="#cite0" title= "dom-quote-cite">cite</a>; }; </ins> </pre> <ins class="diff-chg">The</ins> <code><del class= "diff-old">HTMLElement</del> <a href= "#htmlquoteelement"><ins class="diff-chg">HTMLQuoteElement</ins></a> <del class="diff-old">.</del></code> <ins class= "diff-chg">interface is also used by the</ins> <code><a href= "#q"><ins class="diff-chg">q</ins></a></code> <ins class= "diff-chg">element.</ins> </dd> </dl> The <code><del class="diff-old">pre</del> <a href= "#blockquote"><ins class="diff-chg">blockquote</ins></a></code> element represents a <del class="diff-old">block of preformatted text, in which structure</del> <ins class="diff-chg">section that</ins> is <del class="diff-old">represented by typographic conventions rather than by elements.</del> <ins class= "diff-chg">quoted from another source.</ins> <del class="diff-old">Some examples of cases where the</del> <ins class="diff-chg">Content inside a</ins> <code><del class= "diff-old">pre</del> <a href="#blockquote"><ins class= "diff-chg">blockquote</ins></a></code> <del class= "diff-old">element could</del> <ins class="diff-chg">must</ins> be <del class="diff-old">used: Including an e-mail, with paragraphs indicated by blank lines, lists indicated by lines prefixed with a bullet, and so on. Including fragments of computer code, with structure indicated according to</del> <ins class="diff-chg">quoted from another source, whose URI, if it has one, should be cited in</ins> the <del class="diff-old">conventions of that language. Displaying ASCII art.</del> <dfn id="cite" title= "attr-blockquote-cite"><code><ins class= "diff-chg">cite</ins></code></dfn> <ins class= "diff-chg">attribute.</ins> <del class="diff-old">To represent a block of computer code,</del> <ins class="diff-chg">If</ins> the <code title= "attr-blockquote-cite"><del class="diff-old">pre</del> <a href= "#cite"><ins class="diff-chg">cite</ins></a></code> <del class= "diff-old">element can</del> <ins class="diff-chg">attribute is present, it must</ins> be <del class="diff-old">used with</del> a <del class="diff-old">code element;</del> <ins class="diff-chg">URI (or IRI). User agents should allow users</ins> to <del class= "diff-old">represent</del> <ins class="diff-chg">follow such citation links.</ins> <ins class="diff-chg">If</ins> a <del class="diff-old">block of computer output the</del> <code><del class="diff-old">pre</del> <a href="#blockquote"><ins class= "diff-chg">blockquote</ins></a></code> element <del class= "diff-old">can be used with</del> <ins class="diff-chg">is</ins> <a href="#preceded"><ins class="diff-chg">preceded or followed</ins></a> <ins class="diff-chg">by a single</ins> <a href= "#paragraph"><ins class="diff-chg">paragraph</ins></a> <ins class= "diff-chg">that contains</ins> a <ins class="diff-new">single</ins> <code><del class="diff-old">samp</del> <a href="#cite2"><ins class= "diff-chg">cite</ins></a></code> <del class="diff-old">element. Similarly, the</del> <ins class="diff-chg">element and that is itself not</ins> <a href="#preceded"><ins class="diff-chg">preceded or followed</ins></a> <ins class="diff-chg">by another</ins> <code><del class="diff-old">kbd</del> <a href= "#blockquote"><ins class="diff-chg">blockquote</ins></a></code> element <del class="diff-old">can be used within</del> <ins class= "diff-chg">and does not itself have</ins> a <code><del class= "diff-old">pre</del> <a href="#q"><ins class= "diff-chg">q</ins></a></code> element <del class="diff-old">to indicate text that the user is to enter. In</del> <ins class= "diff-chg">descendant, then,</ins> the <del class= "diff-old">following snippet, a sample</del> <ins class= "diff-chg">title</ins> of <del class="diff-old">computer code is presented. <pre><code>function Panel(element, canClose, closeHandler) { this.element = element; this.canClose = canClose; this.closeHandler = function () { if (closeHandler) closeHandler() }; }</code> </pre> In</del> the <del class= "diff-old">following snippet, samp and</del> <ins class= "diff-chg">work given by that</ins> <code><del class= "diff-old">kbd</del> <a href="#cite2"><ins class= "diff-chg">cite</ins></a></code> <del class="diff-old">elements are mixed in</del> <ins class="diff-chg">element gives</ins> the <del class="diff-old">contents</del> <ins class= "diff-chg">source</ins> of <del class="diff-old">a</del> <ins class="diff-chg">the quotation contained in the</ins> <code><del class="diff-old">pre</del> <a href= "#blockquote"><ins class="diff-chg">blockquote</ins></a></code> <del class="diff-old">element to show a session of Zork I. You are in an open field west of a big white house with a boarded front door. There is a small mailbox here. ></samp> <kbd>open mailbox</kbd> <samp>Opening the mailbox reveals: A leaflet. > </samp> </pre></del> <ins class="diff-chg">element.</ins> The <del class="diff-old">following shows a contemporary poem that uses the</del> <dfn id="cite0" title= "dom-quote-cite"><code><ins class="diff-new">cite</ins></code> <del class="diff-old">pre</del></dfn> <ins class="diff-chg">DOM attribute must</ins> <a href="#reflect"><ins class= "diff-chg">reflect</ins></a> <ins class="diff-chg">the element's</ins> <code title=""><ins class= "diff-chg">cite</ins></code> <del class="diff-old">element</del> <ins class="diff-chg">content attribute.</ins> <ins class="diff-chg">The best way</ins> to <del class="diff-old">preserve its unusual formatting, which forms an intrinsic part of</del> <ins class="diff-chg">represent a conversation is not with</ins> the <del class="diff-old">poem itself. maxling</del> <code><del class="diff-old">it is with a heart heavy</del> <a href="#cite2"><ins class= "diff-chg">cite</ins></a> <del class="diff-old">that i admit loss of a feline so loved</del></code> <ins class="diff-chg">and</ins> <code><del class="diff-old">a friend lost to the unknown (night)</del> <a href="#blockquote"><ins class= "diff-chg">blockquote</ins></a> <del class="diff-old">~cdr 11dec07</pre></del></code> <ins class="diff-chg">elements, but with the</ins> <code><a href="#dialog"><ins class= "diff-chg">dialog</ins></a> <del class="diff-old">3.11. Lists</del></code> <ins class="diff-chg">element.</ins> <h4 id="the-ol"><del class= "diff-old">3.11.1.</del> <ins class="diff-chg">3.9.7</ins> The <dfn id="ol"><code>ol</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd>Zero or more <code><a href="#li">li</a></code> elements.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-ol-reversed"><a href="#reversed"><ins class= "diff-new">reversed</ins></a></code></dd> <dd><code title="attr-ol-start"><a href= "#start0">start</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlolistelement">HTMLOListElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { <ins class="diff-new"> attribute boolean <a href= "#reversed0" title="dom-ol-reversed">reversed</a>; </ins> attribute long <a href="#start1" title= "dom-ol-start">start</a>; }; </pre></dd> </dl> The <code><a href="#ol">ol</a></code> element represents <del class="diff-old">an ordered</del> <ins class= "diff-chg">a</ins> list of <ins class="diff-new">items, where the</ins> items <del class="diff-old">(which</del> <ins class= "diff-chg">have been intentionally ordered, such that changing the order would change the meaning of the document.</ins> <ins class="diff-chg">The items of the list</ins> are <del class="diff-old">represented by</del> <ins class= "diff-chg">the</ins> <code><a href="#li">li</a></code> <del class= "diff-old">elements).</del> <ins class="diff-chg">element child nodes of the</ins> <code><a href="#ol"><ins class= "diff-chg">ol</ins></a></code> <ins class="diff-chg">element, in</ins> <a href="#tree-order"><ins class="diff-chg">tree order</ins></a> . <ins class="diff-chg">The</ins> <dfn id="reversed" title= "attr-ol-reversed"><code><ins class= "diff-chg">reversed</ins></code></dfn> <ins class= "diff-chg">attribute is a</ins> <a href="#boolean0"><ins class= "diff-chg">boolean attribute</ins></a> .<ins class="diff-chg">If present, it indicates that the list is a descending list (..., 3, 2, 1). If the attribute is omitted, the list is an ascending list (1, 2, 3, ...).</ins> The <dfn id="start0" title= "attr-ol-start"><code>start</code></dfn> attribute, if present, must be a <a href="#valid0">valid integer</a> giving the ordinal value of the first list item. If the <code title="attr-ol-start"><a href= "#start0">start</a></code> attribute is present, user agents must <a href="#rules0" title="rules for parsing integers">parse it as an integer</a> , in order to determine the attribute's value. The default value, used if the attribute is missing or if the value cannot be converted to a number according to the referenced algorithm, is <del class="diff-old">1. The items of the list are</del> <ins class="diff-chg">1 if</ins> the <ins class= "diff-chg">element has no</ins> <code title= "attr-ol-reversed"><del class="diff-old">li</del> <a href= "#reversed"><ins class="diff-chg">reversed</ins></a></code> <del class="diff-old">element child nodes of</del> <ins class= "diff-chg">attribute, and is</ins> the <ins class="diff-new">number of child</ins> <code><del class="diff-old">ol</del> <a href= "#li"><ins class="diff-chg">li</ins></a></code> <del class= "diff-old">element, in tree order .</del> <ins class= "diff-chg">elements otherwise.</ins> The first item in the list has the ordinal value given by the <code><a href="#ol">ol</a></code> element's <code title= "attr-ol-start"><a href="#start0">start</a></code> attribute, unless that <code><a href="#li">li</a></code> element has a <code title="attr-li-value"><a href="#value">value</a></code> attribute with a value that can be successfully parsed, in which case it has the ordinal value given by that <code title= "attr-li-value"><a href="#value">value</a></code> attribute. Each subsequent item in the list has the ordinal value given by its <code title="attr-li-value"><a href="#value">value</a></code> attribute, if it has one, or, if it doesn't, the ordinal value of the previous item, plus <del class="diff-old">one.</del> <ins class="diff-chg">one if the</ins> <code title= "attr-ol-reversed"><a href="#reversed"><ins class= "diff-chg">reversed</ins></a></code> <ins class="diff-chg">is absent, or minus one if it is present.</ins> <ins class="diff-chg">The</ins> <dfn id="reversed0" title= "dom-ol-reversed"><code><ins class= "diff-chg">reversed</ins></code></dfn> <ins class="diff-chg">DOM attribute must</ins> <a href="#reflect"><ins class= "diff-chg">reflect</ins></a> <ins class="diff-chg">the value of the</ins> <code title="attr-ol-reversed"><a href= "#reversed"><ins class="diff-chg">reversed</ins></a></code> <ins class="diff-chg">content attribute.</ins> The <dfn id="start1" title= "dom-ol-start"><code>start</code></dfn> DOM attribute must <a href= "#reflect">reflect</a> the value of the <code title= "attr-ol-start"><a href="#start0">start</a></code> content attribute. <div class="example"> <ins class="diff-new">The following markup shows a list where the order matters, and where the</ins> <code><a href= "#ol"><ins class="diff-new">ol</ins></a></code> <ins class= "diff-new">element is therefore appropriate. Compare this list to the equivalent list in the</ins> <code><a href="#ul"><ins class= "diff-new">ul</ins></a></code> <ins class="diff-new">section to see an example of the same items using the</ins> <code><a href= "#ul"><ins class="diff-new">ul</ins></a></code> <ins class= "diff-new">element.</ins> <pre> <p>I have lived in the following countries (given in the order of when<ins class="diff-new"> I first lived there):</p> <ol> <li>Switzerland <li>United Kingdom <li>United States <li>Norway </ol> </ins> </pre> <ins class="diff-new">Note how changing the order of the list changes the meaning of the document. In the following example, changing the relative order of the first two items has changed the birthplace of the author:</ins> <pre> <p>I have lived in the following countries (given in the order of when<ins class="diff-new"> I first lived there):</p> <ol> <li>United Kingdom <li>Switzerland <li>United States <li>Norway </ol> </ins> </pre></div> <h4 id="the-ul"><del class= "diff-old">3.11.2.</del> <ins class="diff-chg">3.9.8</ins> The <dfn id="ul"><code>ul</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd>Zero or more <code><a href="#li">li</a></code> elements.</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#ul">ul</a></code> element represents <del class="diff-old">an unordered</del> <ins class= "diff-chg">a</ins> list of <ins class="diff-new">items, where the order of the</ins> items <del class="diff-old">(which are represented by li elements).</del> <ins class="diff-chg">is not important — that is, where changing the order would not materially change the meaning of the document.</ins> The items of the list are the <code><a href="#li">li</a></code> element child nodes of the <code><a href="#ul">ul</a></code> element. <div class="example"> <ins class="diff-new">The following markup shows a list where the order does not matter, and where the</ins> <code><a href= "#ul"><ins class="diff-new">ul</ins></a></code> <ins class= "diff-new">element is therefore appropriate. Compare this list to the equivalent list in the</ins> <code><a href="#ol"><ins class= "diff-new">ol</ins></a></code> <ins class="diff-new">section to see an example of the same items using the</ins> <code><a href= "#ol"><ins class="diff-new">ol</ins></a></code> <ins class= "diff-new">element.</ins> <pre> <p>I have lived in the following countries:</p><ins class="diff-new"> <ul> <li>Norway <li>Switzerland <li>United Kingdom <li>United States </ul> </ins> </pre> <ins class="diff-new">Note that changing the order of the list does not change the meaning of the document. The items in the snippet above are given in alphabetical order, but in the snippet below they are given in order of the size of their current account balance in 2007, without changing the meaning of the document whatsoever:</ins> <pre> <p>I have lived in the following countries:</p><ins class="diff-new"> <ul> <li>Switzerland <li>Norway <li>United Kingdom <li>United States </ul> </ins> </pre></div> <h4 id="the-li"><del class= "diff-old">3.11.3.</del> <ins class="diff-chg">3.9.9</ins> The <dfn id="li"><code>li</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>Inside <code><a href="#ol">ol</a></code> elements.</dd> <dd>Inside <code><a href="#ul">ul</a></code> elements.</dd> <dd>Inside <code><a href="#menu">menu</a></code> elements.</dd> <dt>Content model:</dt> <dd>When the element is a child of a <code><a href= "#menu">menu</a></code> element: <a href="#phrasing0">phrasing content</a> .</dd> <dd>Otherwise: <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>If the element is a child of an <code><a href= "#ol">ol</a></code> element: <code title="attr-li-value"><a href= "#value">value</a></code></dd> <dd>If the element is not the child of an <code><a href= "#ol">ol</a></code> element: None.</dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id="htmllielement">HTMLLIElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute long <a href="#value0" title= "dom-li-value">value</a>; }; </pre></dd> </dl> The <code><a href="#li">li</a></code> element represents a list item. If its parent element is an <code><a href="#ol">ol</a></code> , <code><a href="#ul">ul</a></code> , or <code><a href= "#menu">menu</a></code> element, then the element is an item of the parent element's list, as defined for those elements. Otherwise, the list item has no defined list-related relationship to any other <code><a href="#li">li</a></code> element. The <dfn id="value" title= "attr-li-value"><code>value</code></dfn> attribute, if present, must be a <a href="#valid0">valid integer</a> giving the ordinal value of the <del class="diff-old">first</del> list item. If the <code title="attr-li-value"><a href= "#value">value</a></code> attribute is present, user agents must <a href="#rules0" title="rules for parsing integers">parse it as an integer</a> , in order to determine the attribute's value. If the attribute's value cannot be converted to a number, the attribute must be treated as if it was absent. The attribute has no default value. The <code title="attr-li-value"><a href= "#value">value</a></code> attribute is processed relative to the element's parent <code><a href="#ol">ol</a></code> element (q.v.), if there is one. If there is not, the attribute has no effect. The <dfn id="value0" title= "dom-li-value"><code>value</code></dfn> DOM attribute must <a href= "#reflect">reflect</a> the value of the <code title= "dom-li-value"><a href="#value0">value</a></code> content attribute. <div class="example"> <ins class="diff-new">The following example, the top ten movies are listed (in reverse order). Note the way the list is given a title by using a</ins> <code><a href="#figure"><ins class= "diff-new">figure</ins></a></code> <ins class="diff-new">element and its</ins> <code><a href="#legend"><ins class= "diff-new">legend</ins></a></code> . <pre> <figure><ins class="diff-new"> <legend>The top 10 movies of all time</legend> <ol> <li value="10"><cite>Josie and the Pussycats</cite>, 2001</li> <li value="9"><cite lang="sh">Црна мачка, бели мачор</cite>, 1998</li> <li value="8"><cite>A Bugs Life</cite>, 1998</li> <li value="7"><cite>Toy Story</cite>, 1995</li> <li value="6"><cite>Monsters, Inc</cite>, 2001</li> <li value="5"><cite>Cars</cite>, 2006</li> <li value="4"><cite>Toy Story 2</cite>, 1999</li> <li value="3"><cite>Finding Nemo</cite>, 2003</li> <li value="2"><cite>The Incredibles</cite>, 2004</li> <li value="1"><cite>Ratatouille</cite>, 2007</li> </ol> </figure> </ins> </pre> <ins class="diff-new">The markup could also be written as follows, using the</ins> <code title="attr-ol-reversed"><a href= "#reversed"><ins class="diff-new">reversed</ins></a></code> <ins class="diff-new">attribute on the</ins> <code><a href= "#ol"><ins class="diff-new">ol</ins></a></code> <ins class= "diff-new">element:</ins> <pre> <figure><ins class="diff-new"> <legend>The top 10 movies of all time</legend> <ol reversed> <li><cite>Josie and the Pussycats</cite>, 2001</li> <li><cite lang="sh">Црна мачка, бели мачор</cite>, 1998</li> <li><cite>A Bugs Life</cite>, 1998</li> <li><cite>Toy Story</cite>, 1995</li> <li><cite>Monsters, Inc</cite>, 2001</li> <li><cite>Cars</cite>, 2006</li> <li><cite>Toy Story 2</cite>, 1999</li> <li><cite>Finding Nemo</cite>, 2003</li> <li><cite>The Incredibles</cite>, 2004</li> <li><cite>Ratatouille</cite>, 2007</li> </ol> </figure> </ins> </pre></div> <h4 id="the-dl"><del class= "diff-old">3.11.4.</del> <ins class="diff-chg">3.9.10</ins> The <dfn id="dl"><code>dl</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd>Zero or more groups each consisting of one or more <code><a href="#dt">dt</a></code> elements followed by one or mode <code><a href="#dd">dd</a></code> elements.</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#dl">dl</a></code> element introduces an <del class="diff-old">unordered</del> association list consisting of zero or more name-value groups (a description list). Each group must consist of one or more names ( <code><a href= "#dt">dt</a></code> elements) followed by one or more values ( <code><a href="#dd">dd</a></code> elements). Name-value groups may be terms and definitions, metadata topics and values, or any other groups of name-value data. The <del class="diff-old">following are all conforming HTML fragments. In the following example, one entry ("Authors") is linked to two</del> values <del class="diff-old">("John" and "Luke"). <dl> <dt> Authors <dd> John <dd> Luke <dt> Editor <dd> Frank </dl> In the following example, one definition is linked to two terms. <dl> <dt lang="en-US"> <dfn>color</dfn> </dt> <dt lang="en-GB"> <dfn>colour</dfn> </dt> <dd> A sensation which (in humans) derives from the ability of the fine structure of the eye to distinguish three differently filtered analyses of a view. </dd> </dl> The following example illustrates the use</del> <ins class= "diff-chg">within a group are alternatives; multiple paragraphs forming part</ins> of the <ins class="diff-new">same value must all be given within the same</ins> <code><del class="diff-old">dl</del> <a href="#dd"><ins class="diff-chg">dd</ins></a></code> <del class= "diff-old">element to mark up metadata</del> <ins class= "diff-chg">element.</ins> <ins class="diff-chg">The order</ins> of <del class= "diff-old">sorts. At</del> the <del class="diff-old">end</del> <ins class="diff-chg">list</ins> of <del class="diff-old">the example, one group has two metadata labels ("Authors"</del> <ins class="diff-chg">groups,</ins> and <del class= "diff-old">"Editors")</del> <ins class="diff-chg">of the names</ins> and <del class="diff-old">two</del> values <del class= "diff-old">("Robert Rothman" and "Daniel Jackson"). <dl> <dt> Last modified time </dt> <dd> 2004-12-23T23:33Z </dd> <dt> Recommended update interval </dt> <dd> 60s </dd> <dt> Authors </dt> <dt> Editors </dt> <dd> Robert Rothman </dd> <dd> Daniel Jackson </dd> </dl></del> <ins class="diff-chg">within each group, may be significant.</ins> If a <code><a href="#dl">dl</a></code> element is empty, it contains no groups. If a <code><a href="#dl">dl</a></code> element contains non- <a href="#inter-element" title= "inter-element whitespace">whitespace</a> <a href="#text-node" title="text node">text nodes</a> , or elements other than <code><a href="#dt">dt</a></code> and <code><a href= "#dd">dd</a></code> , then those elements or <a href="#text-node" title="text node">text nodes</a> do not form part of any groups in that <code><a href="#dl">dl</a> <del class="diff-old">, and the document is non-conforming.</del></code> . If a <code><a href="#dl">dl</a></code> element contains only <code><a href="#dt">dt</a></code> elements, then it consists of one group with names but no <del class="diff-old">values, and the document is non-conforming.</del> <ins class= "diff-chg">values.</ins> If a <code><a href="#dl">dl</a></code> element contains only <code><a href="#dd">dd</a></code> elements, then it consists of one group with values but no <del class="diff-old">names,</del> <ins class="diff-chg">names.</ins> <ins class="diff-chg">If a</ins> <code><a href="#dl"><ins class= "diff-chg">dl</ins></a></code> <ins class="diff-chg">element starts with one or more</ins> <code><a href="#dd"><ins class= "diff-chg">dd</ins></a></code> <ins class="diff-chg">elements, then the first group has no associated name.</ins> <ins class="diff-chg">If a</ins> <code><a href="#dl"><ins class= "diff-chg">dl</ins></a></code> <ins class="diff-chg">element ends with one or more</ins> <code><a href="#dt"><ins class= "diff-chg">dt</ins></a></code> <ins class="diff-chg">elements, then the last group has no associated value.</ins> <ins class="diff-chg">When a</ins> <code><a href= "#dl"><ins class="diff-chg">dl</ins></a></code> <ins class= "diff-chg">element doesn't match its content model, it is often due to accidentally using</ins> <code><a href="#dd"><ins class= "diff-chg">dd</ins></a></code> <ins class="diff-chg">elements in the place of</ins> <code><a href="#dt"><ins class= "diff-chg">dt</ins></a></code> <ins class="diff-chg">elements and vice versa. Conformance checkers can spot such mistakes</ins> and <ins class="diff-new">might be able to advise authors how to correctly use</ins> the <del class="diff-old">document</del> <ins class="diff-chg">markup.</ins> <div class="example"> <ins class="diff-chg">In the following example, one entry ("Authors")</ins> is <del class="diff-old">non-conforming.</del> <ins class="diff-chg">linked to two values ("John" and "Luke").</ins> <pre> <dl><ins class="diff-chg"> <dt> Authors <dd> John <dd> Luke <dt> Editor <dd> Frank </dl> </ins> </pre></div> <div class="example"> <ins class="diff-chg">In the following example, one definition is linked to two terms.</ins> <pre> <dl><ins class="diff-chg"> <dt lang="en-US"> <dfn>color</dfn> </dt> <dt lang="en-GB"> <dfn>colour</dfn> </dt> <dd> A sensation which (in humans) derives from the ability of the fine structure of the eye to distinguish three differently filtered analyses of a view. </dd> </dl> </ins> </pre></div> <div class="example"> <ins class="diff-chg">The following example illustrates the use of the</ins> <code><a href="#dl"><ins class= "diff-chg">dl</ins></a></code> <ins class="diff-chg">element to mark up metadata of sorts. At the end of the example, one group has two metadata labels ("Authors" and "Editors") and two values ("Robert Rothman" and "Daniel Jackson").</ins> <pre> <dl><ins class="diff-chg"> <dt> Last modified time </dt> <dd> 2004-12-23T23:33Z </dd> <dt> Recommended update interval </dt> <dd> 60s </dd> <dt> Authors </dt> <dt> Editors </dt> <dd> Robert Rothman </dd> <dd> Daniel Jackson </dd> </dl> </ins> </pre></div> <div class="example"> <ins class="diff-chg">The following example shows the</ins> <code><a href="#dl"><ins class="diff-chg">dl</ins></a></code> <ins class="diff-chg">element used to give a set of instructions. The order of the instructions here is important (in the other examples, the order of the blocks was not important).</ins> <pre> <p>Determine the victory points as follows (use the<ins class="diff-chg"> first matching case):</p> <dl> <dt> If you have exactly five gold coins </dt> <dd> You get five victory points </dd> <dt> If you have one or more gold coins, and you have one or more silver coins </dt> <dd> You get two victory points </dd> <dt> If you have one or more silver coins </dt> <dd> You get one victory point </dd> <dt> Otherwise </dt> <dd> You get no victory points </dd> </dl> </ins> </pre></div> <div class="example"> <ins class="diff-chg">The following snippet shows a</ins> <code><a href="#dl"><ins class="diff-chg">dl</ins></a></code> <ins class="diff-chg">element being used as a glossary. Note the use of</ins> <code><a href="#dfn"><ins class= "diff-chg">dfn</ins></a></code> <ins class="diff-chg">to indicate the word being defined.</ins> <pre> <dl><ins class="diff-chg"> <dt><dfn>Apartment</dfn>, n.</dt> <dd>An execution context grouping one or more threads with one or more COM objects.</dd> <dt><dfn>Flat</dfn>, n.</dt> <dd>A deflated tire.</dd> <dt><dfn>Home</dfn>, n.</dt> <dd>The user's login directory.</dd> </dl> </ins> </pre></div> The <code><a href="#dl">dl</a></code> element is inappropriate for marking up dialogue, since dialogue is ordered (each speaker/line pair comes after the next). For an example of how to mark up dialogue, see the <code><a href= "#dialog">dialog</a></code> element. <h4 id="the-dt"><del class= "diff-old">3.11.5.</del> <ins class="diff-chg">3.9.11</ins> The <dfn id="dt"><code>dt</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>Before <code><a href="#dd">dd</a></code> or <code><a href= "#dt">dt</a></code> elements inside <code><a href= "#dl">dl</a></code> elements.</dd> <dd>Before a <code><a href="#dd">dd</a></code> element inside a <code><a href="#dialog">dialog</a></code> element.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#dt">dt</a></code> element represents the term, or name, part of a term-description group in a description list ( <code><a href="#dl">dl</a></code> element), and the talker, or speaker, part of a talker-discourse pair in a conversation ( <code><a href="#dialog">dialog</a></code> element). The <code><a href="#dt">dt</a></code> element itself, when used in a <code><a href="#dl">dl</a></code> element, does not indicate that its contents are a term being defined, but this can be indicated using the <code><a href="#dfn">dfn</a></code> element. <ins class="diff-new">If the</ins> <code><a href= "#dt"><ins class="diff-new">dt</ins></a></code> <ins class= "diff-new">element is the child of a</ins> <code><a href= "#dialog"><ins class="diff-new">dialog</ins></a></code> <ins class= "diff-new">element, and it further contains a</ins> <code><a href= "#time"><ins class="diff-new">time</ins></a></code> <ins class= "diff-new">element, then that</ins> <code><a href= "#time"><ins class="diff-new">time</ins></a></code> <ins class= "diff-new">element represents a timestamp for when the associated discourse (</ins> <code><a href="#dd"><ins class= "diff-new">dd</ins></a></code> <ins class="diff-new">element) was said, and is not part of the name of the talker.</ins> <div class="example"> <ins class="diff-new">The following extract shows how an IM conversation log could be marked up.</ins> <pre> <dialog><ins class="diff-new"> <dt> <time>14:22</time> egof <dd> I'm not that nerdy, I've only seen 30% of the star trek episodes <dt> <time>14:23</time> kaj <dd> if you know what percentage of the star trek episodes you have seen, you are inarguably nerdy <dt> <time>14:23</time> egof <dd> it's unarguably <dt> <time>14:24</time> kaj <dd> you are not helping your case </dialog> </ins> </pre></div> <h4 id="the-dd"><del class= "diff-old">3.11.6.</del> <ins class="diff-chg">3.9.12</ins> The <dfn id="dd"><code>dd</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>After <code><a href="#dt">dt</a></code> or <code><a href= "#dd">dd</a></code> elements inside <code><a href= "#dl">dl</a></code> elements.</dd> <dd>After a <code><a href="#dt">dt</a></code> element inside a <code><a href="#dialog">dialog</a></code> element.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#dd">dd</a></code> element represents the description, definition, or value, part of a term-description group in a description list ( <code><a href="#dl">dl</a></code> element), and the discourse, or quote, part in a conversation ( <code><a href="#dialog">dialog</a></code> element). <h3 id="text-level"><del class= "diff-old">3.12.</del> <ins class="diff-chg">3.10</ins> <del class="diff-old">Phrase elements</del> <ins class= "diff-chg">Text-level semantics</ins></h3> <h4 id="the-a"><del class= "diff-old">3.12.1.</del> <ins class="diff-chg">3.10.1</ins> The <dfn id="a"><code>a</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dd><a href="#interactive1">Interactive content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> , but there must be no <a href="#interactive1">interactive content</a> descendant.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-hyperlink-href"><a href= "#href6">href</a></code></dd> <dd><code title="attr-hyperlink-target"><a href= "#target3">target</a></code></dd> <dd><code title="attr-hyperlink-ping"><a href= "#ping">ping</a></code></dd> <dd><code title="attr-hyperlink-rel"><a href= "#rel3">rel</a></code></dd> <dd><code title="attr-hyperlink-media"><a href= "#media12">media</a></code></dd> <dd><code title="attr-hyperlink-hreflang"><a href= "#hreflang3">hreflang</a></code></dd> <dd><code title="attr-hyperlink-type"><a href= "#type17">type</a></code></dd> <dt>DOM interface:</dt> <dd> <pre> <del class="diff-old"> class=idl>interface { </del> <ins class= "diff-chg"> class=idl>[Stringifies=href] interface <dfn id= "htmlanchorelement">HTMLAnchorElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { </ins> attribute DOMString <a href="#href3" title= "dom-a-href">href</a>; attribute DOMString <a href="#target1" title= "dom-a-target">target</a>; attribute DOMString <a href="#ping0" title= "dom-a-ping">ping</a>; attribute DOMString <a href="#rel1" title= "dom-a-rel">rel</a>; readonly attribute DOMTokenList <a href="#rellist0" title= "dom-a-relList">relList</a>; attribute DOMString <a href="#media4" title= "dom-a-media">media</a>; attribute DOMString <a href="#hreflang1" title= "dom-a-hreflang">hreflang</a>; attribute DOMString <a href="#type3" title= "dom-a-type">type</a>; }; </pre> The <code title="command-ro"><a href= "#command2">Command</a></code> interface must also be implemented by this element. </dd> </dl> If the <code><a href="#a">a</a></code> element has an <code title="attr-hyperlink-href"><a href="#href6">href</a></code> attribute, then it represents a <a href="#hyperlinks">hyperlink</a> . If the <code><a href="#a">a</a></code> element has no <code title="attr-hyperlink-href"><a href="#href6">href</a></code> attribute, then the element is a placeholder for where a link might otherwise have been placed, if it had been relevant. The <code title="attr-hyperlink-target"><a href= "#target3">target</a></code> , <code title= "attr-hyperlink-ping"><a href="#ping">ping</a></code> , <code title="attr-hyperlink-rel"><a href="#rel3">rel</a></code> , <code title="attr-hyperlink-media"><a href= "#media12">media</a></code> , <code title= "attr-hyperlink-hreflang"><a href="#hreflang3">hreflang</a></code> , and <code title="attr-hyperlink-type"><a href= "#type17">type</a></code> attributes must be omitted if the <code title="attr-hyperlink-href"><a href="#href6">href</a></code> attribute is not present. <div class="example"> If a site uses a consistent navigation toolbar on every page, then the link that would normally link to the page itself could be marked up using an <code><a href="#a">a</a></code> element: <pre> <nav> <ul> <li> <a href="/">Home</a> </li> <li> <a href="/news">News</a> </li> <li> <a>Examples</a> </li> <li> <a href="/legal">Legal</a> </li> </ul> </nav> </pre></div> Interactive user agents should allow users to <a href= "#following0" title="following hyperlinks">follow hyperlinks</a> created using the <code><a href="#a">a</a></code> element. The <code title="attr-hyperlink-href"><a href="#href6">href</a></code> , <code title="attr-hyperlink-target"><a href= "#target3">target</a></code> and <code title= "attr-hyperlink-ping"><a href="#ping">ping</a></code> attributes decide how the link is followed. The <code title= "attr-hyperlink-rel"><a href="#rel3">rel</a></code> , <code title= "attr-hyperlink-media"><a href="#media12">media</a></code> , <code title="attr-hyperlink-hreflang"><a href= "#hreflang3">hreflang</a></code> , and <code title= "attr-hyperlink-type"><a href="#type17">type</a></code> attributes may be used to indicate to the user the likely nature of the target resource before the user follows the link. The <a href="#activation0">activation behavior</a> of <code><a href="#a">a</a></code> elements that represent hyperlinks is to run the following steps: <ol> <li> If the <code title="event-DOMActivate">DOMActivate</code> event in question is not trusted (i.e. a <code title= "dom-click"><a href="#click">click()</a></code> method call was the reason for the event being dispatched), and the <code><a href= "#a">a</a></code> element's <code title= "attr-hyperlink-target"><a href="#target3">target</a></code> attribute is ... then raise an <code>INVALID_ACCESS_ERR</code> exception and abort these steps. </li> <li> If the target of the <code title= "event-DOMActivate">DOMActivate</code> event is an <code><a href= "#img">img</a></code> element with an <code title= "attr-img-ismap"><a href="#ismap">ismap</a></code> attribute specified, then server-side image map processing must be performed, as follows: <ol> <li>If the <code title="event-DOMActivate">DOMActivate</code> event was dispatched as the result of a real pointing-device-triggered <code title="event-click">click</code> event on the <code><a href= "#img">img</a></code> element, then let <var title="">x</var> be the distance in CSS pixels from the left edge of the image to the location of the click, and let <var title="">y</var> be the distance in CSS pixels from the top edge of the image to the location of the click. Otherwise, let <var title="">x</var> and <var title="">y</var> be zero.</li> <li>Let the <dfn id="hyperlink2"><var>hyperlink suffix</var></dfn> be a U+003F QUESTION MARK character, the value of <var title= "">x</var> expressed as a base-ten integer using ASCII digits (U+0030 DIGIT ZERO to U+0039 DIGIT NINE), a U+002C COMMA character, and the value of <var title="">y</var> expressed as a base-ten integer using ASCII digits.</li> </ol> </li> <li> Finally, the user agent must <a href="#following0" title= "following hyperlinks">follow the hyperlink</a> defined by the <code><a href="#a">a</a></code> element. If the steps above defined a <var><a href="#hyperlink2">hyperlink suffix</a></var> , then take that into account when following the hyperlink. </li> </ol> One way that a user agent can enable users to follow hyperlinks is by allowing <code><a href="#a">a</a></code> elements to be clicked, or focussed and activated by the keyboard. This will cause the aforementioned <a href="#activation0">activation behavior</a> to be invoked. The DOM attributes <dfn id="href3" title= "dom-a-href"><code>href</code></dfn> , <dfn id="ping0" title= "dom-a-ping"><code>ping</code></dfn> , <dfn id="target1" title= "dom-a-target"><code>target</code></dfn> , <dfn id="rel1" title= "dom-a-rel"><code>rel</code></dfn> , <dfn id="media4" title= "dom-a-media"><code>media</code></dfn> , <dfn id="hreflang1" title= "dom-a-hreflang"><code>hreflang</code></dfn> , and <dfn id="type3" title="dom-a-type"><code>type</code></dfn> , must each <a href= "#reflect">reflect</a> the respective content attributes of the same name. The DOM attribute <dfn id="rellist0" title= "dom-a-rellist"><code>relList</code></dfn> must <a href= "#reflect">reflect</a> the <code title= "attr-hyperlink-rel"><a href="#rel3">rel</a></code> content attribute. <h4 id="the-q"><del class= "diff-old">3.12.2.</del> <ins class="diff-chg">3.10.2</ins> The <dfn id="q"><code>q</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-q-cite"><a href="#cite1">cite</a></code></dd> <dt>DOM interface:</dt> <dd>The <code><a href="#q">q</a></code> element uses the <code><a href="#htmlquoteelement">HTMLQuoteElement</a></code> interface.</dd> </dl> The <code><a href="#q">q</a></code> element represents <del class="diff-old">a part of a paragraph</del> <ins class= "diff-chg">some</ins> <a href="#phrasing0" title= "phrasing content"><ins class="diff-chg">phrasing content</ins></a> quoted from another source. <ins class="diff-new">Quotation punctuation (such as quotation marks), if any, must be placed inside the</ins> <code><a href= "#q"><ins class="diff-new">q</ins></a></code> <ins class= "diff-new">element.</ins> Content inside a <code><a href="#q">q</a></code> element must be quoted from another source, whose URI, if it has one, should be cited in the <dfn id="cite1" title= "attr-q-cite"><code>cite</code></dfn> attribute. If the <code title="attr-q-cite"><a href= "#cite1">cite</a></code> attribute is present, it must be a URI (or IRI). User agents should allow users to follow such citation links. If a <code><a href="#q">q</a></code> element is contained (directly or indirectly) in a <a href="#paragraph">paragraph</a> that contains a single <code><a href="#cite2">cite</a></code> element and has no other <code><a href="#q">q</a></code> element descendants, then, the <del class="diff-old">citation</del> <ins class="diff-chg">title of the work</ins> given by that <code><a href="#cite2">cite</a></code> element gives the source of the quotation contained in the <code><a href="#q">q</a></code> element. <div class="example"> <ins class="diff-new">Here is a simple example of the use of the</ins> <code><a href="#q"><ins class= "diff-new">q</ins></a></code> <ins class= "diff-new">element:</ins> <pre> <p>The man said <q>"Things that are impossible just take <ins class="diff-new">longer"</q>. I disagreed with him. </ins> </pre></div> <div class="example"> <ins class="diff-new">Here is an example with both an explicit citation link in the</ins> <code><a href="#q"><ins class= "diff-new">q</ins></a></code> <ins class="diff-new">element, and an explicit citation outside:</ins> <pre> <p>The W3C page <cite>About W3C</cite> says the W3C's<ins class="diff-new"> mission is <q cite="http://www.w3.org/Consortium/">"To lead the World Wide Web to its full potential by developing protocols and guidelines that ensure long-term growth for the Web"</q>. I disagree with this mission. </ins> </pre></div> <div class="example"> <ins class="diff-new">In the following example, the quotation itself contains a quotation:</ins> <pre> <p>In <cite>Example One</cite>, he writes <q>"The man<ins class="diff-new"> said <q>'Things that are impossible just take longer'</q>. I disagreed with him"</q>. Well, I disagree even more!</p> </ins> </pre></div> <div class="example"> <ins class="diff-new">In the following example, there are no quotation marks:</ins> <pre> <ins class="diff-new"> <p> His best argument: <q> I disagree!</q> </p> </ins> </pre></div> <h4 id="the-cite"><del class= "diff-old">3.12.3.</del> <ins class="diff-chg">3.10.3</ins> The <dfn id="cite2"><code>cite</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#cite2">cite</a></code> element represents <del class="diff-old">a citation:</del> the <del class= "diff-old">source,</del> <ins class="diff-chg">title of a work (e.g. a book, a paper, an essay, a poem, a score, a song, a script, a film, a TV show, a game, a sculpture, a painting, a theatre production, a play, an opera, a musical, an exhibition, etc). This can be a work that is being quoted</ins> or <del class= "diff-old">reference, for</del> <ins class="diff-chg">referenced in detail (i.e.</ins> a <del class="diff-old">quote</del> <ins class= "diff-chg">citation),</ins> or <del class="diff-old">statement made</del> <ins class="diff-chg">it can just be a work that is mentioned</ins> in <ins class="diff-new">passing.</ins> <ins class="diff-new">A person's name is not</ins> the <del class="diff-old">document.</del> <ins class="diff-chg">title of a work — even if people call that person a piece of work — and the element must therefore not be used to mark up people's names. (In some cases, the</ins> <code><a href="#b"><ins class= "diff-chg">b</ins></a></code> <ins class="diff-chg">element might be appropriate for names; e.g. in a gossip article where the names of famous people are keywords rendered with a different style to draw attention to them. In other cases, if an element is</ins> <ins class="diff-chg">really</ins> <ins class= "diff-chg">needed, the</ins> <code><a href="#span"><ins class= "diff-chg">span</ins></a></code> <ins class="diff-chg">element can be used.)</ins> <ins class="diff-chg">A ship is similarly not a work, and the element must not be used to mark up ship names (the</ins> <code><a href="#i"><ins class="diff-chg">i</ins></a></code> <ins class="diff-chg">element can be used for that purpose).</ins> <div class="example"> <ins class="diff-chg">This next example shows a typical use of the</ins> <code><a href="#cite2"><ins class= "diff-chg">cite</ins></a></code> <ins class= "diff-chg">element:</ins> <pre> <p>My favourite book is <cite>The Reality Dysfunction</cite> by<ins class="diff-chg"> Peter F. Hamilton. My favourite comic is <cite>Pearls Before Swine</cite> by Stephan Pastis. My favourite track is <cite>Jive Samba</cite> by the Cannonball Adderley Sextet. </ins> </pre></div> <div class="example"> <ins class="diff-chg">This is correct usage:</ins> <pre> <p>According to the Wikipedia article <cite>HTML</cite>, as it<ins class="diff-chg"> stood in mid-February 2008, leaving attribute values unquoted is unsafe. This is obviously an over-simplification. </ins> </pre> <ins class="diff-chg">The following, however, is incorrect usage, as the</ins> <code><a href="#cite2"><ins class= "diff-chg">cite</ins></a></code> <ins class="diff-chg">element here is containing far more than the title of the work:</ins> <pre ins="" class="diff-chg"> class=bad><!-- do not copy this example, it is an example of bad usage! --> <p>According to <cite>the Wikipedia article on HTML</cite>, as it stood in mid-February 2008, leaving attribute values unquoted is unsafe. This is obviously an over-simplification. </pre></div> <div class="example"> <ins class="diff-chg">The</ins> <code><a href= "#cite2"><ins class="diff-chg">cite</ins></a></code> <ins class= "diff-chg">element is obviously a key part of any citation in a bibliography, but it is only used to mark the title:</ins> <pre> <p><cite>Universal Declaration of Human Rights</cite>, United Nations,<ins class="diff-chg"> December 1948. Adopted by General Assembly resolution 217 A (III). </ins> </pre></div> A citation is not a quote (for which the <code><a href="#q">q</a></code> element is appropriate). <div class="example"> This is incorrect <del class="diff-old">usage:</del> <ins class= "diff-chg">usage, because</ins> <code><a href="#cite2"><ins class= "diff-chg">cite</ins></a></code> <ins class="diff-chg">is not for quotes:</ins> <pre> <p> <cite> This is wrong!</cite>, said Ian. </pre> This is <del class="diff-old">the correct way to do it:</del> <ins class="diff-chg">also incorrect usage, because a person is not a work:</ins> <pre> <p> <q> This is <del class="diff-old">correct!</q>, </del> <ins class="diff-chg">still wrong!</q>, </ins> said <cite> Ian</cite>. </pre> <del class="diff-old">This is also wrong, because the title and the name are</del> <ins class="diff-chg">The correct usage does</ins> not <del class="diff-old">references or citations:</del> <ins class="diff-chg">use a</ins> <code><a href= "#cite2"><ins class="diff-chg">cite</ins></a></code> <ins class= "diff-chg">element:</ins> <del class="diff-old">by <cite> Peter F. Hamilton</cite>.</del> <pre> <ins class="diff-chg"><p> <q> This is correct</q>, said Ian. </ins> </pre> <del class="diff-old">This is correct, because even though</del> <ins class="diff-chg">As mentioned above,</ins> the <del class= "diff-old">source is not quoted, it is cited:</del> <code><a href= "#b"><ins class="diff-chg">b</ins></a></code> <ins class= "diff-chg">element might be relevant for marking names as being keywords in certain kinds of documents:</ins> <del class="diff-old">the Wikipedia article on HTML</cite>, HTML is defined in formal specifications that were developed and published throughout the 1990s.</del> <pre> <p>And then <b>Ian said <q>this might be right, in a <ins class="diff-chg">gossip column, maybe!</q>. </ins> </pre></div> The <code><a href="#cite2">cite</a></code> element can apply to <code><a href="#blockquote">blockquote</a></code> and <code><a href="#q">q</a></code> elements in certain cases described in the definitions of those elements. <div class="example"> <ins class="diff-new">This next example shows the use of</ins> <code><a href="#cite2"><ins class="diff-new">cite</ins></a></code> <ins class="diff-new">alongside</ins> <code><a href= "#blockquote"><ins class="diff-new">blockquote</ins></a></code> : <pre> <p>His next piece was the aptly named <cite>Sonnet 130</cite>:</p><ins class="diff-new"> <blockquote> <p>My mistress' eyes are nothing like the sun,<br> Coral is far more red, than her lips red, ... </ins> </pre></div> <h4 id="the-em"><del class= "diff-old">3.12.4.</del> <ins class="diff-chg">3.10.4</ins> The <dfn id="em"><code>em</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#em">em</a></code> element represents stress emphasis of its contents. The level of emphasis that a <del class= "diff-old">particlar</del> <ins class="diff-chg">particular</ins> piece of content has is given by its number of ancestor <code><a href="#em">em</a></code> elements. The placement of emphasis changes the meaning of the sentence. The element thus forms an integral part of the content. The precise way in which emphasis is used in this way depends on the language. <div class="example"> These examples show how changing the emphasis changes the meaning. First, a general statement of fact, with no emphasis: <pre> <p> Cats are cute animals. </pre> By <del class="diff-old">emphasising</del> <ins class= "diff-chg">emphasizing</ins> the first word, the statement implies that the kind of animal under discussion is in question (maybe someone is asserting that dogs are cute): <pre> <p> <em> Cats are cute animals. </pre> Moving the emphasis to the verb, one highlights that the truth of the entire sentence is in question (maybe someone is saying cats are not cute): <pre> <p> Cats <em> are cute animals. </pre> By moving it to the adjective, the exact nature of the cats is reasserted (maybe someone suggested cats were mean animals): <pre> <p> Cats are <em> cute animals. </pre> Similarly, if someone asserted that cats were vegetables, someone correcting this might <del class="diff-old">emphasise</del> <ins class="diff-chg">emphasize</ins> the last word: <pre> <p> Cats are cute <em> animals. </pre> By <del class="diff-old">emphasising</del> <ins class= "diff-chg">emphasizing</ins> the entire sentence, it becomes clear that the speaker is fighting hard to get the point across. This kind of emphasis also typically affects the punctuation, hence the exclamation mark here. <pre> <p> <em> Cats are cute animals!</em> </p> </pre> Anger mixed with <del class="diff-old">emphasising</del> <ins class="diff-chg">emphasizing</ins> the cuteness could lead to markup such as: <pre> <p> <em> Cats are <em> cute animals!</em> </p> </pre></div> <h4 id="the-strong"><del class= "diff-old">3.12.5.</del> <ins class="diff-chg">3.10.5</ins> The <dfn id="strong"><code>strong</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#strong">strong</a></code> element represents strong importance for its contents. The relative level of importance of a piece of content is given by its number of ancestor <code><a href="#strong">strong</a></code> elements; each <code><a href="#strong">strong</a></code> element increases the importance of its contents. Changing the importance of a piece of text with the <code><a href="#strong">strong</a></code> element does not change the meaning of the sentence. <div class="example"> Here is an example of a warning notice in a game, with the various parts marked up according to how important they are: <pre> <p><strong>Warning. This dungeon is dangerous. <strong>Avoid the ducks. Take any gold you find. <strong><strong>Do not take any of the diamonds, they are explosive and <strong>will destroy anything within ten meters. </strong> You have been warned. </pre></div> <h4 id="the-small"><del class= "diff-old">3.12.6.</del> <ins class="diff-chg">3.10.6</ins> The <dfn id="small"><code>small</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#small">small</a></code> element represents small print (part of a document often describing legal restrictions, such as copyrights or other disadvantages), or other side comments. The <code><a href="#small">small</a></code> element does not <del class="diff-old">"de-emphasise"</del> <ins class= "diff-chg">"de-emphasize"</ins> or lower the importance of text emphasised by the <code><a href="#em">em</a></code> element or marked as important with the <code><a href= "#strong">strong</a></code> element. <div class="example"> In this example the footer contains contact information and a copyright. <pre> <footer> <address> For more details, contact <a href="mailto:js@example.com">John Smith</a>. </address> <p><small>© copyright 2038 Example Corp.</p> </footer> </pre> In this second example, the <code><a href= "#small">small</a></code> element is used for a side comment. <pre> <p>Example Corp today announced record profits for the second quarter <small>(Full Disclosure: Foo News is a subsidiary of Example Corp)</small>, leading to speculation about a third quarter merger with Demo Group. </pre> In this last example, the <code><a href= "#small">small</a></code> element is marked as being important small print. <pre> <p> <strong> <small> Continued use of this service will result in a kiss. </strong> </p> </pre></div> <h4 id="the-mark"><del class= "diff-old">3.12.7.</del> <ins class="diff-chg">3.10.7</ins> The <dfn id="mark"><code><del class="diff-old">m</del> <ins class= "diff-chg">mark</ins></code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> <del class="diff-old">This section has a large number of outstanding comments and will likely be rewritten or removed from the spec.</del> The <code><del class="diff-old">m</del> <a href= "#mark"><ins class="diff-chg">mark</ins></a></code> element represents a run of text <ins class="diff-new">in one document</ins> marked or <del class="diff-old">highlighted. In</del> <ins class="diff-chg">highlighted for reference purposes, due to its relevance in another context. When used in a quotation or other block of text referred to from</ins> the <del class= "diff-old">following snippet,</del> <ins class="diff-chg">prose, it indicates</ins> a <del class="diff-old">paragraph</del> <ins class= "diff-chg">highlight that was not originally present but which has been added to bring the reader's attention to a part</ins> of <ins class="diff-new">the</ins> text <del class= "diff-old">refers</del> <ins class="diff-chg">that might not have been considered important by the original author when the block was originally written, but which is now under previously unexpected scrutiny. When used in the main prose of a document, it indicates a part of the document that has been highlighted due to its likely relevance</ins> to <ins class="diff-new">the user's current activity.</ins> <ins class="diff-new">The rendering section will eventually suggest that user agents provide</ins> a <del class="diff-old">specific</del> <ins class="diff-chg">way to let users jump between</ins> <code><a href="#mark"><ins class= "diff-chg">mark</ins></a></code> <ins class="diff-chg">elements. Suggested rendering is a neon yellow background highlight, though UAs maybe should allow this to be toggled.</ins> <div class="example"> <ins class="diff-chg">This example shows how the</ins> <code><a href="#mark"><ins class="diff-chg">mark</ins></a></code> <ins class="diff-chg">example can be used to bring attention to a particular</ins> part of a <del class="diff-old">code fragment.</del> <ins class="diff-chg">quotation:</ins> <del class="diff-old"><pre><code>var i: Integer; begin i := <m>1.1</m>; end.</code> </pre></del> <pre> <p lang="en-US">Consider the following quote:</p> <ins class="diff-chg"><blockquote lang="en-GB"> <p>Look around and you will find, no-one's really <mark>colour blind. </blockquote> <p lang="en-US">As we can tell from the <em>spelling of the word, the person writing this quote is clearly not American. </ins> </pre></div> <div class="example"> Another example of the <code><del class="diff-old">m</del> <a href="#mark"><ins class="diff-chg">mark</ins></a></code> element is highlighting parts of a document that are matching some search string. If someone looked at a document, and the server knew that the user was searching for the word "kitten", then the server might return the document with one paragraph modified as follows: <del class="diff-old">s who are visiting me these days. They're really cute. I think</del> <pre> <p>I also have some <mark>kittens who are visiting me <ins class= "diff-chg">these days. They're really cute. I think they like my garden! Maybe I should adopt a <mark> kitten. </ins> </pre></div> <div class="example"> <ins class="diff-chg">In the following snippet, a paragraph of text refers to a specific part of a code fragment.</ins> <pre> <p>The highlighted part below is where the error lies:</p><ins class="diff-chg"> <pre><code>var i: Integer; begin i := <mark>1.1; end.</code> </pre> </ins> </pre></div> <div class="example"> <ins class="diff-chg">This is another example showing the use of</ins> <code><a href="#mark"><ins class= "diff-chg">mark</ins></a></code> <ins class="diff-chg">to highlight a part of quoted text that was originally not emphasised. In this example, common typographic conventions have led the author to explicitly style</ins> <code><a href="#mark"><ins class= "diff-chg">mark</ins></a></code> <ins class="diff-chg">elements in quotes to render in italics.</ins> <pre> <article><ins class="diff-chg"> <style> blockquote mark, q mark { font: inherit; font-style: italic; text-decoration: none; background: transparent; color: inherit; } .bubble em { font: inherit; font-size: larger; text-decoration: underline; } </style> <h1>She knew</h1> <p>Did you notice the subtle joke in the joke on panel 4?</p> <blockquote> <p class="bubble">I didn't <em>want to believe. <mark>Of course on some level I realized it was a known-plaintext attack. But I couldn't admit it until I saw for myself. </blockquote> <p>(Emphasis mine.) I thought that was great. It's so pedantic, yet it explains everything neatly. </article> </ins> </pre> <ins class="diff-chg">Note, incidentally, the distinction between the</ins> <code><a href="#em"><ins class= "diff-chg">em</ins></a></code> <ins class="diff-chg">element in this example, which is part of the original text being quoted, and the</ins> <code><a href="#mark"><ins class= "diff-chg">mark</ins></a></code> <ins class="diff-chg">element, which is highlighting a part for comment.</ins> </div> <div class="example"> <ins class="diff-chg">The following example shows the difference between denoting the</ins> <ins class= "diff-chg">importance</ins> <ins class="diff-chg">of a span of text (</ins> <code><a href="#strong"><ins class= "diff-chg">strong</ins></a></code> <ins class="diff-chg">) as opposed to denoting the</ins> <ins class= "diff-chg">relevance</ins> <ins class="diff-chg">of a span of text (</ins> <code><a href="#mark"><ins class= "diff-chg">mark</ins></a></code> <ins class="diff-chg">). It is an extract from a textbook, where the extract has had the parts relevant to the exam highlighted. The safety warnings, important though</ins> they <del class="diff-old">like my garden!</p></del> <ins class="diff-chg">may be, are apparently not relevant to the exam.</ins> <pre> <h3>Wormhole Physics Introduction</h3><ins class= "diff-chg"> <p><mark>A wormhole in normal conditions can be held open for a maximum of just under 39 minutes. Conditions that can increase the time include a powerful energy source coupled to one or both of the gates connecting the wormhole, and a large gravity well (such as a black hole). <p><mark>Momentum is preserved across the wormhole. Electromagnetic radiation can travel in both directions through a wormhole, but matter cannot.</p> <p>When a wormhole is created, a vortex normally forms. <strong>Warning: The vortex caused by the wormhole opening will annihilate anything in its path. Vortexes can be avoided when using sufficiently advanced dialing technology. <p><mark>An obstruction in a gate will prevent it from accepting a wormhole connection. </p> </ins> </pre></div> <h4 id="the-dfn"><del class= "diff-old">3.12.8.</del> <ins class="diff-chg">3.10.8</ins> The <dfn id="dfn"><code>dfn</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> , but there must be no descendant <code><a href="#dfn">dfn</a></code> elements.</dd> <dt>Element-specific attributes:</dt> <dd>None, but the <code title="attr-dfn-title"><a href= "#title4">title</a></code> attribute has special semantics on this element.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#dfn">dfn</a></code> element represents the defining instance of a term. The <a href="#paragraph" title= "paragraph">paragraph</a> , <a href="#dl" title="dl">description list group</a> , or <a href="#sectioning0" title= "sectioning content">section</a> that <del class= "diff-old">contains</del> <ins class="diff-chg">is the nearest ancestor of</ins> the <code><a href="#dfn">dfn</a></code> element <del class="diff-old">contains</del> <ins class="diff-chg">must also contain</ins> the <del class="diff-old">definition</del> <ins class="diff-chg">definition(s)</ins> for the <a href= "#defining" title="defining term">term</a> given by the <del class= "diff-old">contents of the</del> <code><a href= "#dfn">dfn</a></code> element. <dfn id="defining">Defining term</dfn> : If the <code><a href= "#dfn">dfn</a></code> element has a <dfn id="title4" title= "attr-dfn-title"><code>title</code></dfn> attribute, then the exact value of that attribute is the term being defined. Otherwise, if it contains exactly one element child node and no child <a href= "#text-node" title="text node">text nodes</a> , and that child element is an <code><a href="#abbr">abbr</a></code> element with a <code title="attr-abbr-title"><a href="#title5">title</a></code> attribute, then the exact value of that attribute is the term being defined. Otherwise, it is the exact <code><a href= "#textcontent">textContent</a></code> of the <code><a href= "#dfn">dfn</a></code> element that gives the term being defined. If the <code title="attr-dfn-title"><a href= "#title4">title</a></code> attribute of the <code><a href= "#dfn">dfn</a></code> element is present, then it must <del class= "diff-old">only</del> contain <ins class="diff-new">only</ins> the term being defined. <del class="diff-old">There must only be one dfn element per document for each term defined (i.e. there must not be any duplicate terms ).</del> The <code title="attr-title"><a href= "#title">title</a></code> attribute of ancestor elements does not affect <code><a href="#dfn">dfn</a></code> elements. <del class= "diff-old">The dfn element enables automatic cross-references. Specifically, any span , abbr , code , var , samp , or</del> <ins class="diff-chg">An</ins> <code><del class= "diff-old">i</del> <a href="#a"><ins class= "diff-chg">a</ins></a></code> element that <del class= "diff-old">has a non-empty title attribute whose value exactly equals the term of</del> <ins class="diff-chg">links to</ins> a <code><a href="#dfn">dfn</a></code> element <del class= "diff-old">in the same document, or which has no title attribute but whose textContent exactly equals the term</del> <ins class= "diff-chg">represents an instance</ins> of <del class="diff-old">a dfn element in</del> the <del class="diff-old">document, and that has no interactive elements or dfn elements either as ancestors or descendants, and has no other elements as ancestors that are themselves matching these conditions, should be presented in such a way that the user can jump from the element to</del> <ins class= "diff-chg">term defined by</ins> the <del class= "diff-old">first</del> <code><a href="#dfn">dfn</a></code> <del class="diff-old">element giving the defining instance of that term.</del> <ins class="diff-chg">element.</ins> <div class="example"> In the following fragment, the term "GDO" is first defined in the first paragraph, then used in the second. <del class= "diff-old">A compliant UA could provide a link from the abbr element in</del> <pre> <p>The <dfn><abbr title="Garage Door Opener">GDO</abbr></dfn> <ins class= "diff-chg">is a device that allows off-world teams to open the iris. <!-- ... later in the document: --> <p>Teal'c activated his <abbr title="Garage Door Opener">GDO</abbr> and so Hammond ordered </ins> the <del class="diff-old">second paragraph </del> <ins class="diff-chg">iris </ins> to <ins class="diff-new">be opened. </ins> </pre> <ins class="diff-new">With</ins> the <ins class= "diff-new">addition of an</ins> <code><del class= "diff-old">dfn</del> <a href="#a"><ins class= "diff-chg">a</ins></a></code> <del class="diff-old">element in</del> <ins class="diff-chg">element,</ins> the <del class= "diff-old">first.</del> <ins class="diff-chg">reference can be made explicit:</ins> <del class="diff-old"></del> <pre> <p>The <dfn id=gdo><abbr title="Garage Door Opener">GDO</abbr></dfn> is a device that allows off-world teams to open the iris. <!-- ... later in the document: --> <del class= "diff-old"><p>Teal'c activated his <abbr title="Garage Door Opener">GDO</abbr> </del> <ins class= "diff-chg"><p>Teal'c activated his <a href=#gdo><abbr title="Garage Door Opener">GDO</abbr></a> </ins> and so Hammond ordered the iris to be opened. </pre></div> <h4 id="the-abbr"><del class= "diff-old">3.12.9.</del> <ins class="diff-chg">3.10.9</ins> The <dfn id="abbr"><code>abbr</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None, but the <code title="attr-abbr-title"><a href= "#title5">title</a></code> attribute has special semantics on this element.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#abbr">abbr</a></code> element represents an abbreviation or <del class="diff-old">acronym.</del> <ins class= "diff-chg">acronym, optionally with its expansion.</ins> The <dfn id="title5" title="attr-abbr-title"><code>title</code></dfn> attribute <del class="diff-old">should</del> <ins class= "diff-chg">may</ins> be used to provide an expansion of the abbreviation. <del class="diff-old">If present, the attribute</del> <ins class="diff-chg">The attribute, if specified,</ins> must <del class="diff-old">only</del> contain an expansion of the <del class="diff-old">abbreviation.</del> <ins class= "diff-chg">abbreviation, and nothing else.</ins> <div class="example"> The paragraph below contains an abbreviation marked up with the <code><a href="#abbr">abbr</a></code> element. <ins class= "diff-new">This paragraph</ins> <a href="#defining" title= "defining term"><ins class="diff-new">defines the term</ins></a> <ins class="diff-new">"Web Hypertext Application Technology Working Group".</ins> <del class="diff-old">The <abbr title="Web Hypertext Application Technology Working Group">WHATWG</abbr> is a loose unofficial collaboration of Web browser manufacturers and interested parties who wish to develop new technologies designed to allow authors to write and deploy</del> <pre> <p>The <dfn id=whatwg><abbr title="Web Hypertext Application <ins class= "diff-chg">Technology Working Group">WHATWG</abbr></dfn> is a loose unofficial collaboration of Web browser manufacturers and interested parties who wish to develop new technologies designed to allow authors to write and deploy </ins> Applications over the World Wide Web. </pre></div> <div class="example"> <del class="diff-old">The title attribute may be omitted if there is a dfn element in the document whose defining term</del> <ins class="diff-chg">This paragraph has two abbreviations. Notice how only one</ins> is <ins class="diff-new">defined;</ins> the <del class="diff-old">abbreviation (the textContent of</del> <ins class="diff-chg">other, with no expansion associated with it, does not use</ins> the <code><a href="#abbr">abbr</a></code> <del class="diff-old">element).</del> <ins class= "diff-chg">element.</ins> <pre> <p>The <abbr title="Web Hypertext Application Technology Working<ins class="diff-chg"> Group"> WHATWG</abbr> started working on HTML5 in 2004. </ins> </pre></div> <div class="example"> <del class="diff-old">In the example below, the word "Zat" is used as</del> <ins class="diff-chg">This paragraph links</ins> an abbreviation <del class="diff-old">in</del> <ins class= "diff-chg">to its definition.</ins> <pre> <p>The <a href="#whatwg"><abbr title="Web Hypertext Application<ins class="diff-chg"> Technology Working Group">WHATWG</abbr></a> community does not have much representation from Asia. </ins> </pre></div> <div class="example"> <ins class="diff-chg">This paragraph marks up an abbreviation without giving an expansion, possibly as a hook to apply styles for abbreviations (e.g. smallcaps).</ins> <pre> <p>Philip` and Dashiva both denied that they were going to<ins class="diff-chg"> get the issue counts from past revisions of the specification to backfill </ins> the <del class="diff-old">second paragraph. The </del> <ins class="diff-chg"><abbr> WHATWG</abbr> issue graph. </ins> </pre></div> <ins class="diff-chg">If an</ins> abbreviation is <del class= "diff-old">defined in</del> <ins class="diff-chg">pluralized,</ins> the <del class="diff-old">first, so</del> <ins class= "diff-chg">expansion's grammatical number (plural vs singular) must match</ins> the <del class="diff-old">explanatory title attribute has been omitted. Because</del> <ins class="diff-chg">grammatical number</ins> of the <del class="diff-old">way dfn elements are defined,</del> <ins class="diff-chg">contents of</ins> the <del class="diff-old">second abbr element</del> <ins class= "diff-chg">element.</ins> <div class="example"> <ins class="diff-chg">Here the plural is outside the element, so the expansion is</ins> in <del class="diff-old">this example would be connected (in some UA-specific way) to</del> the <del class= "diff-old">first.</del> <ins class="diff-chg">singular:</ins> <del class="diff-old"><p> Jack used a</del> <pre> <p>Two <abbr title="Working Group">WG</abbr>s worked on <ins class= "diff-chg">this specification: the <abbr>WHATWG</abbr> and the </ins> <abbr> <del class="diff-old">Zat</abbr> to make </del> <ins class="diff-chg">HTMLWG</abbr>. </ins> </pre> <ins class="diff-chg">Here</ins> the <del class="diff-old">boxes of evidence disappear.</del> <ins class="diff-chg">plural is inside the element, so the expansion is in the plural:</ins> <pre> <p>Two <abbr title="Working Groups">WGs</abbr> worked on<ins class="diff-chg"> this specification: the <abbr>WHATWG</abbr> and the <abbr> HTMLWG</abbr>. </ins> </pre></div> <h4 id="the-time"><del class= "diff-old">3.12.10.</del> <ins class= "diff-chg">3.10.10</ins> The <dfn id= "time"><code>time</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-time-datetime"><a href= "#datetime">datetime</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmltimeelement">HTMLTimeElement</dfn> : <a href="#htmlelement">HTMLElement</a> { attribute DOMString <a href="#datetime0" title= "dom-time-datetime">dateTime</a>; readonly attribute <a href= "#domtimestamp">DOMTimeStamp</a> <a href="#date0" title= "dom-time-date">date</a>; readonly attribute <a href= "#domtimestamp">DOMTimeStamp</a> <a href="#time1" title= "dom-time-time">time</a>; readonly attribute <a href= "#domtimestamp">DOMTimeStamp</a> <a href="#timezone0" title= "dom-time-timezone">timezone</a>; }; </pre></dd> </dl> The <code><a href="#time">time</a></code> element represents a date and/or a time. The <dfn id="datetime" title= "attr-time-datetime"><code>datetime</code></dfn> attribute, if present, must contain a <a href="#date-or">date or time string</a> that identifies the date or time being specified. If the <code title="attr-time-datetime"><a href= "#datetime">datetime</a></code> attribute is not present, then the date or time must be specified in the content of the element, such that parsing the element's <code><a href= "#textcontent">textContent</a></code> according to the rules for parsing <a href="#date-or0" title= "date or time string in content">date or time strings in content</a> successfully extracts a date or time. The <dfn id="datetime0" title= "dom-time-datetime"><code>dateTime</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the <code title= "attr-time-datetime"><a href="#datetime">datetime</a></code> content attribute. User agents, to obtain the <dfn id="date" title= "concept-time-date">date</dfn> , <dfn id="time0" title= "concept-time-time">time</dfn> , and <dfn id="timezone" title= "concept-time-timezone">timezone</dfn> represented by a <code><a href="#time">time</a></code> element, must follow these steps: <ol> <li>If the <code title="attr-time-datetime"><a href= "#datetime">datetime</a></code> attribute is present, then parse it according to the rules for parsing <a href="#date-or1" title= "date or time string in attributes">date or time strings in attributes</a> , and let the result be <var title="">result</var> .</li> <li>Otherwise, parse the element's <code><a href= "#textcontent">textContent</a></code> according to the rules for parsing <a href="#date-or1" title= "date or time string in attributes">date or time strings in content</a> , and let the result be <var title="">result</var> .</li> <li>If <var title="">result</var> is empty (because the parsing failed), then the <a href="#date" title= "concept-time-date">date</a> is unknown, the <a href="#time0" title="concept-time-time">time</a> is unknown, and the <a href= "#timezone" title="concept-time-timezone">timezone</a> is unknown.</li> <li>Otherwise: if <var title="">result</var> contains a date, then that is the <a href="#date" title="concept-time-date">date</a> ; if <var title="">result</var> contains a time, then that is the <a href="#time0" title="concept-time-time">time</a> ; and if <var title="">result</var> contains a timezone, then the timezone is the element's <a href="#timezone" title= "concept-time-timezone">timezone</a> . (A timezone can only be present if both a date and a time are also present.)</li> </ol> The <dfn id="date0" title= "dom-time-date"><code>date</code></dfn> DOM attribute must return null if the <a href="#date" title="concept-time-date">date</a> is unknown, and otherwise must return the time corresponding to midnight UTC (i.e. the first second) of the given <a href="#date" title="concept-time-date">date</a> . The <dfn id="time1" title= "dom-time-time"><code>time</code></dfn> DOM attribute must return null if the <a href="#time0" title="concept-time-time">time</a> is unknown, and otherwise must return the time corresponding to the given <a href="#time0" title="concept-time-time">time</a> of 1970-01-01, with the timezone UTC. The <dfn id="timezone0" title= "dom-time-timezone"><code>timezone</code></dfn> DOM attribute must return null if the <a href="#timezone" title= "concept-time-timezone">timezone</a> is unknown, and otherwise must return the time corresponding to 1970-01-01 00:00 UTC in the given <a href="#timezone" title="concept-time-timezone">timezone</a> , with the timezone set to UTC (i.e. the time corresponding to 1970-01-01 at 00:00 UTC plus the offset corresponding to the timezone). <div class="example"> In the following snippet: <pre> <p> Our first date was <time datetime="2006-09-23"> a <del class="diff-old">saturday</time>. </del> <ins class="diff-chg">Saturday</time>. </ins> </pre> ...the <code><a href="#time">time</a></code> element's <code title="dom-time-date"><a href="#date0">date</a></code> attribute would have the value 1,158,969,600,000ms, and the <code title="dom-time-time"><a href="#time1">time</a></code> and <code title="dom-time-timezone"><a href= "#timezone0">timezone</a></code> attributes would return null. In the following snippet: <pre> <p> We stopped talking at <time datetime="2006-09-24 05:00 -7"> 5am the next morning</time>. </pre> ...the <code><a href="#time">time</a></code> element's <code title="dom-time-date"><a href="#date0">date</a></code> attribute would have the value 1,159,056,000,000ms, the <code title="dom-time-time"><a href="#time1">time</a></code> attribute would have the value 18,000,000ms, and the <code title= "dom-time-timezone"><a href="#timezone0">timezone</a></code> attribute would return <del class="diff-old">-25,200,000ms.</del> <ins class="diff-chg">−25,200,000ms.</ins> To obtain the actual time, the three attributes can be added together, obtaining 1,159,048,800,000, which is the specified date and time in UTC. Finally, in the following snippet: <pre> <p> Many people get up at <time> 08:00</time>. </pre> ...the <code><a href="#time">time</a></code> element's <code title="dom-time-date"><a href="#date0">date</a></code> attribute would have the value null, the <code title= "dom-time-time"><a href="#time1">time</a></code> attribute would have the value 28,800,000ms, and the <code title= "dom-time-timezone"><a href="#timezone0">timezone</a></code> attribute would return null. </div> These APIs may be suboptimal. Comments on making them more useful to JS authors are welcome. The primary use cases for these elements are for marking up publication dates e.g. in blog entries, and for marking event dates in hCalendar markup. Thus the DOM APIs are likely to be used as ways to generate interactive calendar widgets or some such. <h4 id="the-progress"><del class= "diff-old">3.12.11.</del> <ins class= "diff-chg">3.10.11</ins> The <dfn id= "progress"><code>progress</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-progress-value"><a href= "#value1">value</a></code></dd> <dd><code title="attr-progress-max"><a href= "#max">max</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlprogresselement">HTMLProgressElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute float <a href="#value2" title= "dom-progress-value">value</a>; attribute float <a href="#max0" title= "dom-progress-max">max</a>; readonly attribute float <a href="#position" title= "dom-progress-position">position</a>; }; </pre></dd> </dl> The <code><a href="#progress">progress</a></code> element represents the completion progress of a task. The progress is either indeterminate, indicating that progress is being made but that it is not clear how much more work remains to be done before the task is complete (e.g. because the task is waiting for a remote host to respond), or the progress is a number in the range zero to a maximum, giving the fraction of work that has so far been completed. There are two attributes that determine the current task completion represented by the element. The <dfn id="value1" title= "attr-progress-value"><code>value</code></dfn> attribute specifies how much of the task has been completed, and the <dfn id="max" title="attr-progress-max"><code>max</code></dfn> attribute specifies how much work the task requires in total. The units are arbitrary and not specified. Instead of using the attributes, authors are recommended to <del class="diff-old">simply</del> include the current value and the maximum value inline as text inside the element. <div class="example"> Here is a snippet of a Web application that shows the progress of some automated task: <pre> <section> <h2>Task Progress</h2> <del class= "diff-old"> <p><label>Progress: <progress><span id="p">0%</progress></p> </del> <ins class= "diff-chg"> <p>Progress: <progress><span id="p">0%</progress></p> </ins> <script> var progressBar = document.getElementById('p'); function updateProgress(newValue) { progressBar.textContent = newValue; } </script> </section> </pre> (The <code>updateProgress()</code> method in this example would be called by some other code on the page to update the actual progress bar as the task progressed.) </div> Author requirements : The <code title= "attr-progress-max"><a href="#max">max</a></code> and <code title= "attr-progress-value"><a href="#value1">value</a></code> attributes, when present, must have values that are <a href= "#valid1" title="valid floating point number">valid floating point numbers</a> . The <code title="attr-progress-max"><a href= "#max">max</a></code> attribute, if present, must have a value greater than zero. The <code title="attr-progress-value"><a href= "#value1">value</a></code> attribute, if present, must have a value equal to or greater than zero, and less than or equal to the value of the <code title="attr-progress-max"><a href= "#max">max</a></code> attribute, if present. <ins class="diff-new">The</ins> <code><a href= "#progress"><ins class="diff-new">progress</ins></a></code> <ins class="diff-new">element is the wrong element to use for something that is just a gauge, as opposed to task progress. For instance, indicating disk space usage using</ins> <code><a href= "#progress"><ins class="diff-new">progress</ins></a></code> <ins class="diff-new">would be inappropriate. Instead, the</ins> <code><a href="#meter"><ins class="diff-new">meter</ins></a></code> <ins class="diff-new">element is available for such use cases.</ins> User agent requirements : User agents must parse the <code title="attr-progress-max"><a href= "#max">max</a></code> and <code title= "attr-progress-value"><a href="#value1">value</a></code> attributes' values according to the <a href="#rules1">rules for parsing floating point number values</a> . If the <code title="attr-progress-value"><a href= "#value1">value</a></code> attribute is omitted, then user agents must also parse the <code><a href= "#textcontent">textContent</a></code> of the <code><a href= "#progress">progress</a></code> element in question using the <a href="#steps">steps for finding one or two numbers of a ratio in a string</a> . These steps will return nothing, one number, one number with a denominator punctuation character, or two numbers. Using the results of this processing, user agents must determine whether the progress bar is an indeterminate progress bar, or whether it is a determinate progress bar, and in the latter case, what its current and maximum values are, all as follows: <ol> <li>If the <code title="attr-progress-max"><a href= "#max">max</a></code> attribute is omitted, and the <code title= "attr-progress-value"><a href="#value1">value</a></code> is omitted, and the results of parsing the <code><a href= "#textcontent">textContent</a></code> was nothing, then the progress bar is an indeterminate progress bar. Abort these steps.</li> <li>Otherwise, it is a determinate progress bar.</li> <li>If the <code title="attr-progress-max"><a href= "#max">max</a></code> attribute is included, then, if a value could be parsed out of it, then the maximum value is that value.</li> <li>Otherwise, if the <code title="attr-progress-max"><a href= "#max">max</a></code> attribute is absent but the <code title= "attr-progress-value"><a href="#value1">value</a></code> attribute is present, or, if the <code title="attr-progress-max"><a href= "#max">max</a></code> attribute is present but no value could be parsed from it, then the maximum is 1.</li> <li>Otherwise, if neither attribute is included, then, if the <code><a href="#textcontent">textContent</a></code> contained one number with an associated denominator punctuation character, then the maximum value is the value associated with that denominator punctuation character ; otherwise, if the <code><a href="#textcontent">textContent</a></code> contained two numbers, the maximum value is the higher of the two values; otherwise, the maximum value is 1.</li> <li>If the <code title="attr-progress-value"><a href= "#value1">value</a></code> attribute is present on the element and a value could be parsed out of it, that value is the current value of the progress bar. Otherwise, if the attribute is present but no value could be parsed from it, the current value is zero.</li> <li>Otherwise if the <code title="attr-progress-value"><a href= "#value1">value</a></code> attribute is absent and the <code title= "attr-progress-max"><a href="#max">max</a></code> attribute is present, then, if the <code><a href= "#textcontent">textContent</a></code> was parsed and found to contain just one number, with no associated denominator punctuation character, then the current value is that number. Otherwise, if the <code title="attr-progress-value"><a href= "#value1">value</a></code> attribute is absent and the <code title= "attr-progress-max"><a href="#max">max</a></code> attribute is present then the current value is zero.</li> <li>Otherwise, if neither attribute is present, then the current value is the lower of the one or two numbers that were found in the <code><a href="#textcontent">textContent</a></code> of the element.</li> <li>If the maximum value is less than or equal to zero, then it is reset to 1.</li> <li>If the current value is less than zero, then it is reset to zero.</li> <li>Finally, if the current value is greater than the maximum value, then the current value is reset to the maximum value.</li> </ol> UA requirements for showing the progress bar : When representing a <code><a href="#progress">progress</a></code> element to the user, the UA should indicate whether it is a determinate or indeterminate progress bar, and in the former case, should indicate the relative position of the current value relative to the maximum value. The <dfn id="max0" title= "dom-progress-max"><code>max</code></dfn> and <dfn id="value2" title="dom-progress-value"><code>value</code></dfn> DOM attributes must <a href="#reflect">reflect</a> the elements' content attributes of the same name. When the relevant content attributes are absent, the DOM attributes must return zero. The value parsed from the <code><a href="#textcontent">textContent</a></code> never affects the DOM values. Would be cool to have the <code title= "dom-progress-value"><a href="#value2">value</a></code> DOM attribute update the <code><a href= "#textcontent">textContent</a></code> in-line... If the progress bar is an indeterminate progress bar, then the <dfn id="position" title= "dom-progress-position"><code>position</code></dfn> DOM attribute must return <del class="diff-old">-1.</del> <ins class= "diff-chg">−1.</ins> Otherwise, it must return the result of dividing the current value by the maximum value. <h4 id="the-meter"><del class= "diff-old">3.12.12.</del> <ins class= "diff-chg">3.10.12</ins> The <dfn id= "meter"><code>meter</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-meter-value"><a href= "#value3">value</a></code></dd> <dd><code title="attr-meter-min"><a href="#min">min</a></code></dd> <dd><code title="attr-meter-low"><a href="#low">low</a></code></dd> <dd><code title="attr-meter-high"><a href= "#high">high</a></code></dd> <dd><code title="attr-meter-max"><a href= "#max1">max</a></code></dd> <dd><code title="attr-meter-optimum"><a href= "#optimum">optimum</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlmeterelement">HTMLMeterElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { <del class="diff-old"> attribute long ; attribute long ; attribute long ; attribute long ; attribute long ; attribute long ; </del> <ins class="diff-chg"> attribute float <a href="#value4" title="dom-meter-value">value</a>; attribute float <a href="#min0" title= "dom-meter-min">min</a>; attribute float <a href="#max2" title= "dom-meter-max">max</a>; attribute float <a href="#low0" title= "dom-meter-low">low</a>; attribute float <a href="#high0" title= "dom-meter-high">high</a>; attribute float <a href="#optimum0" title= "dom-meter-optimum">optimum</a>; </ins> }; </pre></dd> </dl> The <code><a href="#meter">meter</a></code> element represents a scalar measurement within a known range, or a fractional value; for example disk usage, the relevance of a query result, or the fraction of a voting population to have selected a particular candidate. This is also known as a gauge. The <code><a href="#meter">meter</a></code> element should not be used to indicate progress (as in a progress bar). For that role, HTML provides a separate <code><a href= "#progress">progress</a></code> element. The <code><a href="#meter">meter</a></code> element also does not represent a scalar value of arbitrary range — for example, it would be wrong to use this to report a weight, or height, unless there is a known maximum value. There are six attributes that determine the semantics of the gauge represented by the element. The <dfn id="min" title="attr-meter-min"><code>min</code></dfn> attribute specifies the lower bound of the range, and the <dfn id= "max1" title="attr-meter-max"><code>max</code></dfn> attribute specifies the upper bound. The <dfn id="value3" title= "attr-meter-value"><code>value</code></dfn> attribute specifies the value to have the gauge indicate as the "measured" value. The other three attributes can be used to segment the gauge's range into "low", "medium", and "high" parts, and to indicate which part of the gauge is the "optimum" part. The <dfn id="low" title= "attr-meter-low"><code>low</code></dfn> attribute specifies the range that is considered to be the "low" part, and the <dfn id= "high" title="attr-meter-high"><code>high</code></dfn> attribute specifies the range that is considered to be the "high" part. The <dfn id="optimum" title= "attr-meter-optimum"><code>optimum</code></dfn> attribute gives the position that is "optimum"; if that is higher than the "high" value then this indicates that the higher the value, the better; if it's lower than the "low" mark then it indicates that lower values are better, and naturally if it is in between then it indicates that neither high nor low values are good. Authoring requirements : The recommended way of giving the value is to include it as contents of the element, either as two numbers (the higher number represents the maximum, the other number the current <del class="diff-old">value),</del> <ins class="diff-chg">value, and the minimum is assumed to be zero),</ins> or as a percentage or similar (using one of the characters such as "%"), or as a fraction. The <code title="attr-meter-value"><a href= "#value3">value</a></code> , <code title="attr-meter-min"><a href= "#min">min</a></code> , <code title="attr-meter-low"><a href= "#low">low</a></code> , <code title="attr-meter-high"><a href= "#high">high</a></code> , <code title="attr-meter-max"><a href= "#max1">max</a></code> , and <code title= "attr-meter-optimum"><a href="#optimum">optimum</a></code> attributes are all optional. When present, they must have values that are <a href="#valid1" title= "valid floating point number">valid floating point numbers <del class="diff-old">.</del></a> , <ins class="diff-chg">and their values must satisfy the following inequalities:</ins> <ul class="brief"> <li><code title="attr-meter-min"><a href="#min"><ins class= "diff-chg">min</ins></a></code> <ins class="diff-chg">≤</ins> <code title="attr-meter-value"><a href="#value3"><ins class= "diff-chg">value</ins></a></code> <ins class="diff-chg">≤</ins> <code title="attr-meter-max"><a href="#max1"><ins class= "diff-chg">max</ins></a></code></li> <li><code title="attr-meter-min"><a href="#min"><ins class= "diff-chg">min</ins></a></code> <ins class="diff-chg">≤</ins> <code title="attr-meter-low"><a href="#low"><ins class= "diff-chg">low</ins></a></code> <ins class="diff-chg">≤</ins> <code title="attr-meter-high"><a href="#high"><ins class= "diff-chg">high</ins></a></code> <ins class="diff-chg">≤</ins> <code title="attr-meter-max"><a href="#max1"><ins class= "diff-chg">max</ins></a></code></li> <li><code title="attr-meter-min"><a href="#min"><ins class= "diff-chg">min</ins></a></code> <ins class="diff-chg">≤</ins> <code title="attr-meter-optimum"><a href="#optimum"><ins class= "diff-chg">optimum</ins></a></code> <ins class="diff-chg">≤</ins> <code title="attr-meter-max"><a href="#max1"><ins class= "diff-chg">max</ins></a></code></li> </ul> <div class="example"> The following examples all represent a measurement of three quarters (of the maximum of whatever is being measured): <pre> <meter>75%</meter> <meter>750‰</meter> <meter>3/4</meter> <meter>6 blocks used (out of 8 total)</meter> <meter>max: 100; current: 75</meter> <meter><object data="graph75.png">0.75</object></meter> <meter min="0" max="100" value="75"> </meter> </pre> The following example is incorrect use of the element, because it doesn't give a range (and since the default maximum is 1, both of the gauges would end up looking maxed out): <del class="diff-old"></del> <pre> <ins class= "diff-chg"> class=bad><p>The grapefruit pie had a radius of <meter>12cm</meter> </ins> and a height of <meter> 2cm</meter>. <!--  BAD!  --> </pre> Instead, one would either not include the meter element, or use the meter element with a defined range to give the dimensions in context compared to other pies: <pre> <p>The grapefruit pie had a radius of 12cm and a height of 2cm. <dl> <dt>Radius: <dd> <meter min=0 max=20 value=12>12cm</meter> <dt>Height: <dd> <meter min=0 max=10 value=2>2cm</meter> </dl> </pre></div> There is no explicit way to specify units in the <code><a href= "#meter">meter</a></code> element, but the units may be specified in the <code title="attr-title"><a href="#title">title</a></code> attribute in <del class="diff-old">freeform</del> <ins class= "diff-chg">free-form</ins> text. <div class="example"> The example above could be extended to mention the units: <pre> <dl> <dt>Radius: <dd> <meter min=0 max=20 value=12 title="centimeters">12cm</meter> <dt>Height: <dd> <meter min=0 max=10 value=2 title="centimeters">2cm</meter> </dl> </pre></div> User agent requirements : User agents must parse the <code title="attr-meter-min"><a href= "#min">min</a></code> , <code title="attr-meter-max"><a href= "#max1">max</a></code> , <code title="attr-meter-value"><a href= "#value3">value</a></code> , <code title="attr-meter-low"><a href= "#low">low</a></code> , <code title="attr-meter-high"><a href= "#high">high</a></code> , and <code title= "attr-meter-optimum"><a href="#optimum">optimum</a></code> attributes using the <a href="#rules1">rules for parsing floating point number values</a> . If the <code title="attr-meter-value"><a href= "#value3">value</a></code> attribute has been omitted, the user agent must also process the <code><a href= "#textcontent">textContent</a></code> of the element according to the <a href="#steps">steps for finding one or two numbers of a ratio in a string</a> . These steps will return nothing, one number, one number with a denominator punctuation character, or two numbers. User agents must then use all these numbers to obtain values for six points on the gauge, as follows. (The order in which these are evaluated is important, as some of the values refer to earlier ones.) <dl> <dt>The minimum value</dt> <dd> If the <code title="attr-meter-min"><a href= "#min">min</a></code> attribute is specified and a value could be parsed out of it, then the minimum value is that value. Otherwise, the minimum value is zero. </dd> <dt>The maximum value</dt> <dd> If the <code title="attr-meter-max"><a href= "#max1">max</a></code> attribute is specified and a value could be parsed out of it, the maximum value is that value. Otherwise, if the <code title="attr-meter-max"><a href= "#max1">max</a></code> attribute is specified but no value could be parsed out of it, or if it was not specified, but either or both of the <code title="attr-meter-min"><a href="#min">min</a></code> or <code title="attr-meter-value"><a href="#value3">value</a></code> attributes were specified, then the maximum value is 1. Otherwise, none of the <code title="attr-meter-max"><a href= "#max1">max</a></code> , <code title="attr-meter-min"><a href= "#min">min</a></code> , and <code title="attr-meter-value"><a href= "#value3">value</a></code> attributes were specified. If the result of processing the <code><a href= "#textcontent">textContent</a></code> of the element was either nothing or just one number with no denominator punctuation character, then the maximum value is 1; if the result was one number but it had an associated denominator punctuation character, then the maximum value is the <a href="#a-value" title= "values associated with denominator punctuation characters">value associated with that denominator punctuation character</a> ; and finally, if there were two numbers parsed out of the <code><a href= "#textcontent">textContent</a></code> , then the maximum is the higher of those two numbers. If the above machinations result in a maximum value less than the minimum value, then the maximum value is actually the same as the minimum value. </dd> <dt>The actual value</dt> <dd> If the <code title="attr-meter-value"><a href= "#value3">value</a></code> attribute is specified and a value could be parsed out of it, then that value is the actual value. If the <code title="attr-meter-value"><a href= "#value3">value</a></code> attribute is not specified but the <code title="attr-meter-max"><a href="#max1">max</a></code> attribute is specified and the result of processing the <code><a href="#textcontent">textContent</a></code> of the element was one number with no associated denominator punctuation character, then that number is the actual value. If neither of the <code title="attr-meter-value"><a href= "#value3">value</a></code> and <code title= "attr-meter-max"><a href="#max1">max</a></code> attributes are specified, then, if the result of processing the <code><a href= "#textcontent">textContent</a></code> of the element was one number (with or without an associated denominator punctuation character), then that is the actual value, and if the result of processing the <code><a href="#textcontent">textContent</a></code> of the element was two numbers, then the actual value is the lower of the two numbers found. Otherwise, if none of the above apply, the actual value is zero. If the above procedure results in an actual value less than the minimum value, then the actual value is actually the same as the minimum value. If, on the other hand, the result is an actual value greater than the maximum value, then the actual value is the maximum value. </dd> <dt>The low boundary</dt> <dd> If the <code title="attr-meter-low"><a href= "#low">low</a></code> attribute is specified and a value could be parsed out of it, then the low boundary is that value. Otherwise, the low boundary is the same as the minimum value. If the above results in a low boundary that is less than the minimum value, the low boundary is the minimum value. </dd> <dt>The high boundary</dt> <dd> If the <code title="attr-meter-high"><a href= "#high">high</a></code> attribute is specified and a value could be parsed out of it, then the high boundary is that value. Otherwise, the high boundary is the same as the maximum value. If the above results in a high boundary that is higher than the maximum value, the high boundary is the maximum value. </dd> <dt>The optimum point</dt> <dd> If the <code title="attr-meter-optimum"><a href= "#optimum">optimum</a></code> attribute is specified and a value could be parsed out of it, then the optimum point is that value. Otherwise, the optimum point is the midpoint between the minimum value and the maximum value. If the optimum point is then less than the minimum value, then the optimum point is actually the same as the minimum value. Similarly, if the optimum point is greater than the maximum value, then it is actually the maximum value instead. </dd> </dl> All of which should result in the following inequalities all being true: <ul class="brief"> <li>minimum value ≤ actual value ≤ maximum value</li> <li>minimum value ≤ low boundary ≤ high boundary ≤ maximum value</li> <li>minimum value ≤ optimum point ≤ maximum value</li> </ul> UA requirements for regions of the gauge : If the optimum point is equal to the low boundary or the high boundary, or anywhere in between them, then the region between the low and high boundaries of the gauge must be treated as the optimum region, and the low and high parts, if any, must be treated as suboptimal. Otherwise, if the optimum point is less than the low boundary, then the region between the minimum value and the low boundary must be treated as the optimum region, the region between the low boundary and the high boundary must be treated as a suboptimal region, and the region between the high boundary and the maximum value must be treated as an even less good region. Finally, if the optimum point is higher than the high boundary, then the situation is reversed; the region between the high boundary and the maximum value must be treated as the optimum region, the region between the high boundary and the low boundary must be treated as a suboptimal region, and the remaining region between the low boundary and the minimum value must be treated as an even less good region. UA requirements for showing the gauge : When representing a <code><a href="#meter">meter</a></code> element to the user, the UA should indicate the relative position of the actual value to the minimum and maximum values, and the relationship between the actual value and the three regions of the gauge. <div class="example"> The following markup: <pre> <h3>Suggested groups</h3> <menu type="toolbar"> <a href="?cmd=hsg" onclick="hideSuggestedGroups()">Hide suggested groups</a> </menu> <ul> <li> <p><a href="/group/comp.infosystems.www.authoring.stylesheets/view">comp.infosystems.www.authoring.stylesheets</a> - <a href="/group/comp.infosystems.www.authoring.stylesheets/subscribe">join</a></p> <p>Group description: <strong>Layout/presentation on the WWW.</p> <p><meter value="0.5">Moderate activity,</meter> Usenet, 618 subscribers </li> <li> <p><a href="/group/netscape.public.mozilla.xpinstall/view">netscape.public.mozilla.xpinstall</a> - <a href="/group/netscape.public.mozilla.xpinstall/subscribe">join</a></p> <p>Group description: <strong>Mozilla XPInstall discussion.</p> <p><meter value="0.25">Low activity,</meter> Usenet, 22 subscribers </li> <li> <p><a href="/group/mozilla.dev.general/view">mozilla.dev.general</a> - <a href="/group/mozilla.dev.general/subscribe">join</a></p> <p><meter value="0.25">Low activity,</meter> Usenet, 66 subscribers </li> </ul> </pre> Might be rendered as follows: <img alt= "With the <meter> elements rendered as inline green bars of varying lengths." src="images/sample-meter.png"> </div> User agents may combine the value of the <code title= "attr-title"><a href="#title">title</a></code> attribute and the other attributes to provide context-sensitive help or inline text detailing the actual values. <div class="example"> For example, the following snippet: <pre> <meter min=0 max=60 value=23.2 title=seconds> </meter> </pre> ...might cause the user agent to display a gauge with a tooltip saying "Value: 23.2 out of 60." on one line and "seconds" on a second line. </div> The <dfn id="min0" title="dom-meter-min"><code>min</code></dfn> , <dfn id="max2" title="dom-meter-max"><code>max</code></dfn> , <dfn id="value4" title="dom-meter-value"><code>value</code></dfn> , <dfn id="low0" title="dom-meter-low"><code>low</code></dfn> , <dfn id="high0" title="dom-meter-high"><code>high</code></dfn> , and <dfn id="optimum0" title= "dom-meter-optimum"><code>optimum</code></dfn> DOM attributes must <a href="#reflect">reflect</a> the elements' content attributes of the same name. When the relevant content attributes are absent, the DOM attributes must return zero. The value parsed from the <code><a href="#textcontent">textContent</a></code> never affects the DOM values. Would be cool to have the <code title= "dom-meter-value"><a href="#value4">value</a></code> DOM attribute update the <code><a href="#textcontent">textContent</a></code> in-line... <h4 id="the-code"><del class= "diff-old">3.12.13.</del> <ins class= "diff-chg">3.10.13</ins> The <dfn id= "code"><code>code</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><del class="diff-old">None, but the title attribute has special semantics on this element when used with the dfn element.</del> <ins class="diff-chg">None.</ins></dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#code">code</a></code> element represents a fragment of computer code. This could be an XML element name, a filename, a computer program, or any other string that a computer would <del class="diff-old">recognise.</del> <ins class= "diff-chg">recognize.</ins> Although there is no formal way to indicate the language of computer code being marked up, authors who wish to mark <code><a href="#code">code</a></code> elements with the language used, e.g. so that syntax highlighting scripts can use the right rules, may do so by adding a class prefixed with " <code title= "">language-</code> " to the element. <div class="example"> The following example shows how <ins class="diff-new">the element can be used in a paragraph to mark up element names and computer code, including punctuation.</ins> <pre> <p>The <code>code</code> element represents a fragment of computer<ins class="diff-new"> code. <p>When you call the <code>activate()</code> method on the <code>robotSnowman</code> object, the eyes glow. <p>The example below uses the <code>begin</code> keyword to indicate the start of a statement block. It is paired with an <code>end</code> keyword, which is followed by the <code>.</code> punctuation character (full stop) to indicate the end of the program. </ins> </pre></div> <div class="example"> <ins class="diff-new">The following example shows how</ins> a block of code could be marked up using the <code><a href= "#pre">pre</a></code> and <code><a href="#code">code</a></code> elements. <pre> <pre><code class="language-pascal">var i: Integer; begin i := 1; end.</code> </pre> </pre> A class is used in that example to indicate the language used. </div> See the <code><a href="#pre">pre</a></code> element for more <del class="diff-old">detais.</del> <ins class= "diff-chg">details.</ins> <h4 id="the-var"><del class= "diff-old">3.12.14.</del> <ins class= "diff-chg">3.10.14</ins> The <dfn id= "var"><code>var</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><del class="diff-old">None, but the title attribute has special semantics on this element when used with the dfn element.</del> <ins class="diff-chg">None.</ins></dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#var">var</a></code> element represents a variable. This could be an actual variable in a mathematical expression or programming context, or it could just be a term used as a placeholder in prose. <div class="example"> In the paragraph below, the letter "n" is being used as a variable in prose: <pre> <p>If there are <var>n</var> pipes leading to the ice cream factory then I expect at <em>least <var>n</var> flavours of ice cream to be available for purchase!</p> </pre></div> <h4 id="the-samp"><del class= "diff-old">3.12.15.</del> <ins class= "diff-chg">3.10.15</ins> The <dfn id= "samp"><code>samp</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><del class="diff-old">None, but the title attribute has special semantics on this element when used with the dfn element.</del> <ins class="diff-chg">None.</ins></dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#samp">samp</a></code> element represents (sample) output from a program or computing system. See the <code><a href="#pre">pre</a></code> and <code><a href="#kbd">kbd</a></code> elements for more <del class= "diff-old">detais.</del> <ins class="diff-chg">details.</ins> <div class="example"> This example shows the <code><a href="#samp">samp</a></code> element being used inline: <pre> <p>The computer said <samp>Too much cheese in tray two</samp> but I didn't know what that meant. </pre> This second example shows a block of sample output. Nested <code><a href="#samp">samp</a></code> and <code><a href= "#kbd">kbd</a></code> elements allow for the styling of specific elements of the sample output using a style sheet. <pre> <pre><samp><samp class="prompt">jdoe@mowmow:~$</samp> <kbd>ssh demo.example.com</kbd> Last login: Tue Apr 12 09:10:17 2005 from mowmow.example.com on pts/1 Linux demo 2.6.10-grsec+gg3+e+fhs6b+nfs+gr0501+++p3+c4a+gr2b-reslog-v6.189 #1 SMP Tue Feb 1 11:22:36 PST 2005 i686 unknown <samp class="prompt"> jdoe@demo:~$</samp> <samp class="cursor"> _</samp> </samp> </pre> </pre></div> <h4 id="the-kbd"><del class= "diff-old">3.12.16.</del> <ins class= "diff-chg">3.10.16</ins> The <dfn id= "kbd"><code>kbd</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#kbd">kbd</a></code> element represents user input (typically keyboard input, although it may also be used to represent other input, such as voice commands). When the <code><a href="#kbd">kbd</a></code> element is nested inside a <code><a href="#samp">samp</a></code> element, it represents the input as it was echoed by the system. When the <code><a href="#kbd">kbd</a></code> element contains a <code><a href="#samp">samp</a></code> element, it represents input based on system output, for example invoking a menu item. When the <code><a href="#kbd">kbd</a></code> element is nested inside another <code><a href="#kbd">kbd</a></code> element, it represents an actual key or other single unit of input as appropriate for the input mechanism. <div class="example"> Here the <code><a href="#kbd">kbd</a></code> element is used to indicate keys to press: <pre> <p> To make George eat an apple, press <kbd> <kbd> Shift</kbd> +<kbd> F3</kbd> </kbd> </p> </pre> In this second example, the user is told to pick a particular menu item. The outer <code><a href="#kbd">kbd</a></code> element marks up a block of input, with the inner <code><a href= "#kbd">kbd</a></code> elements representing each individual step of the input, and the <code><a href="#samp">samp</a></code> elements inside them indicating that the steps are input based on something being displayed by the system, in this case menu labels: <pre> <p>To make George eat an apple, select <kbd><kbd><samp>File</samp></kbd>|<kbd><samp>Eat Apple...</samp></kbd></kbd> </p> </pre></div> <h4 id="the-sub"><del class= "diff-old">3.12.17.</del> <ins class= "diff-chg">3.10.17</ins> The <dfn id= "sub"><code>sub</code></dfn> and <dfn id= "sup"><code>sup</code></dfn> elements</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which these elements may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#sup">sup</a></code> element represents a superscript and the <code><a href="#sub">sub</a></code> element represents a subscript. These elements must <del class="diff-old">only</del> be used <ins class="diff-new">only</ins> to mark up typographical conventions with specific meanings, not for typographical presentation for presentation's sake. For example, it would be inappropriate for the <code><a href="#sub">sub</a></code> and <code><a href="#sup">sup</a></code> elements to be used in the name of the LaTeX document preparation system. In general, authors should <del class="diff-old">only</del> use these elements <ins class="diff-new">only</ins> if the absence of those elements would change the meaning of the content. When the <code><a href="#sub">sub</a></code> element is used inside a <code><a href="#var">var</a></code> element, it represents the subscript that identifies the variable in a family of variables. <div class="example"> <pre> <p>The coordinate of the <var>i</var>th point is (<var>x<var>i</var></sub></var>, <var>y<var>i</var></sub></var>). For example, the 10th point has coordinate (<var> x 10 </var>, <var> y 10 </var> ). </pre></div> In certain languages, superscripts are part of the typographical conventions for some abbreviations. <div class="example"> <pre> <p>The most beautiful women are <span lang="fr"><abbr>Mlle</abbr> Gwendoline and <span lang="fr"> <abbr> M me </abbr> Denise. </pre></div> Mathematical expressions often use subscripts and superscripts. <ins class="diff-chg">Authors are encouraged to use MathML for marking up mathematics, but authors may opt to use</ins> <code><a href="#sub"><ins class="diff-chg">sub</ins></a></code> <ins class="diff-chg">and</ins> <code><a href="#sup"><ins class= "diff-chg">sup</ins></a></code> <ins class="diff-chg">if detailed mathematical markup is not desired.</ins> <a href= "#references"><ins class="diff-chg">[MathML]</ins></a> <div class="example"> <pre> <var> E</var> =<var> m</var> <var> c</var> <sup> 2 </pre> <pre> f(<var> x</var>, <var> n</var> ) = log 4 <var> x</var> <sup> <var> n</var> </sup> </pre></div> <h4 id="the-span"><del class= "diff-old">3.12.18.</del> <ins class= "diff-chg">3.10.18</ins> The <dfn id= "span"><code>span</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><del class="diff-old">None, but the title attribute has special semantics on this element when used with the dfn element.</del> <ins class="diff-chg">None.</ins></dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#span">span</a></code> element doesn't mean anything on its own, but can be useful when used together with other attributes, e.g. <code title="attr-class"><a href= "#class">class</a></code> , <code title="attr-lang"><a href= "#lang">lang</a></code> , or <code title="attr-dir"><a href= "#dir">dir</a> <del class="diff-old">, or when used in conjunction with the dfn element.</del></code> . <h4 id="the-i"><del class= "diff-old">3.12.19.</del> <ins class= "diff-chg">3.10.19</ins> The <dfn id= "i"><code>i</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><del class="diff-old">None, but the title attribute has special semantics on this element when used with the dfn element.</del> <ins class="diff-chg">None.</ins></dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#i">i</a></code> element represents a span of text in an alternate voice or mood, or otherwise offset from the normal prose, such as a taxonomic designation, a technical term, an idiomatic phrase from another language, a thought, a ship name, or some other prose whose typical typographic presentation is italicized. Terms in languages different from the main text should be annotated with <code title="attr-lang"><a href= "#lang">lang</a></code> attributes ( <code title= "attr-xml-lang"><a href="#xmllang">xml:lang</a></code> in XML). <div class="example"> The examples below show uses of the <code><a href= "#i">i</a></code> element: <del class="diff-old"></del> <pre> <p>The <i class="taxonomy">Felis silvestris catus is cute. <p>The term <i>prose content is defined above. <p> There is a certain <i lang="fr"> je ne sais quoi in the air. </pre> In the following example, a dream sequence is marked up using <code><a href="#i">i</a></code> elements. <pre> <p>Raymond tried to sleep. <p><i>The ship sailed away on Thursday, he dreamt. <i>The ship had many people aboard, including a beautiful princess called Carey. He watched her, day-in, day-out, hoping she would notice him, but she never did.</p> <p><i>Finally one night he picked up the courage to speak with her—</i></p> <p> Raymond woke with a start as the fire alarm rang out. </pre></div> The <code><a href="#i">i</a></code> element should be used as a last resort when no other element is more appropriate. In particular, citations should use the <code><a href= "#cite2">cite</a></code> element, defining instances of terms should use the <code><a href="#dfn">dfn</a></code> element, stress emphasis should use the <code><a href="#em">em</a></code> element, importance should be denoted with the <code><a href= "#strong">strong</a></code> element, quotes should be marked up with the <code><a href="#q">q</a></code> element, and small print should use the <code><a href="#small">small</a></code> element. <ins class="diff-new">Authors are encouraged to use the</ins> <code title="attr-class"><a href="#class"><ins class= "diff-new">class</ins></a></code> <ins class="diff-new">attribute on the</ins> <code><a href="#i"><ins class= "diff-new">i</ins></a></code> <ins class="diff-new">element to identify why the element is being used, so that if the style of a particular use (e.g. dream sequences as opposed to taxonomic terms) is to be changed at a later date, the author doesn't have to go through the entire document (or series of related documents) annotating each use.</ins> Style sheets can be used to format <code><a href= "#i">i</a></code> elements, just like any other element can be restyled. Thus, it is not the case that content in <code><a href= "#i">i</a></code> elements will necessarily be <del class= "diff-old">italicised.</del> <ins class= "diff-chg">italicized.</ins> <h4 id="the-b"><del class= "diff-old">3.12.20.</del> <ins class= "diff-chg">3.10.20</ins> The <dfn id= "b"><code>b</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#b">b</a></code> element represents a span of text to be stylistically offset from the normal prose without conveying any extra importance, such as key words in a document abstract, product names in a review, or other spans of text whose typical typographic presentation is boldened. <div class="example"> The following example shows a use of the <code><a href= "#b">b</a></code> element to highlight key words without marking them up as important: <pre> <p> The <b> frobonitor and <b> barbinator components are fried. </pre></div> <div class="example"> <del class="diff-old">The following would be incorrect usage: <p> <b> WARNING!</b> Do not frob the barbinator!</p> In the previous example, the correct element to use would have been strong , not b .</del> In the following example, objects in a text adventure are highlighted as being special by use of the <code><a href="#b">b</a></code> element. <pre> <p>You enter a small room. Your <b>sword glows brighter. A <b> rat scurries past the corner wall. </pre></div> <div class="example"> Another case where the <code><a href="#b">b</a></code> element is appropriate is in marking up the lede (or lead) sentence or paragraph. The following example shows how a <a href= "http://news.bbc.co.uk/2/hi/uk_news/scotland/north_east/7101506.stm"> BBC article about kittens adopting a rabbit as their own</a> could be marked up using HTML5 elements: <pre> <article> <h2>Kittens 'adopted' by pet rabbit</h2> <p><b>Six abandoned kittens have found an unexpected new mother figure — a pet rabbit.</p> <p>Veterinary nurse Melanie Humble took the three-week-old kittens to her Aberdeen home.  [...]  </pre></div> The <code><a href="#b">b</a></code> element should be used as a last resort when no other element is more appropriate. In particular, headers should use the <code><a href= "#h1">h1</a></code> to <code><a href="#h6">h6</a></code> elements, stress emphasis should use the <code><a href="#em">em</a></code> element, importance should be denoted with the <code><a href= "#strong">strong</a></code> element, and text marked or highlighted should use the <code><del class="diff-old">m</del> <a href= "#mark"><ins class="diff-chg">mark</ins></a></code> element. <div class="example"> <ins class="diff-new">The following would be</ins> <ins class="diff-new">incorrect</ins> <ins class= "diff-new">usage:</ins> <pre> <ins class="diff-new"> <p> <b> WARNING!</b> Do not frob the barbinator!</p> </ins> </pre> <ins class="diff-new">In the previous example, the correct element to use would have been</ins> <code><a href= "#strong"><ins class="diff-new">strong</ins></a></code> ,<ins class="diff-new">not</ins> <code><a href="#b"><ins class= "diff-new">b</ins></a></code> . </div> Style sheets can be used to format <code><a href= "#b">b</a></code> elements, just like any other element can be restyled. Thus, it is not the case that content in <code><a href= "#b">b</a></code> elements will necessarily be boldened. <h4 id="the-bdo"><del class= "diff-old">3.12.21.</del> <ins class= "diff-chg">3.10.21</ins> The <dfn id= "bdo"><code>bdo</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None, but the <code title="attr-dir"><a href= "#dir">dir</a></code> global attribute has special requirements on this element.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#bdo">bdo</a></code> element allows authors to override the Unicode bidi algorithm by explicitly specifying a direction override. <a href="#references">[BIDI]</a> Authors must specify the <code title="attr-dir"><a href= "#dir">dir</a></code> attribute on this element, with the value <code>ltr</code> to specify a left-to-right override and with the value <code>rtl</code> to specify a right-to-left override. If the element has the <code title="attr-dir"><a href= "#dir">dir</a></code> attribute set to the exact value <code>ltr</code> , then for the purposes of the bidi algorithm, the user agent must act as if there was a U+202D LEFT-TO-RIGHT OVERRIDE character at the start of the element, and a U+202C POP DIRECTIONAL FORMATTING at the end of the element. If the element has the <code title="attr-dir"><a href= "#dir">dir</a></code> attribute set to the exact value <code>rtl</code> , then for the purposes of the bidi algorithm, the user agent must act as if there was a U+202E RIGHT-TO-LEFT OVERRIDE character at the start of the element, and a U+202C POP DIRECTIONAL FORMATTING at the end of the element. The requirements on handling the <code><a href= "#bdo">bdo</a></code> element for the bidi algorithm may be implemented indirectly through the style layer. For example, an HTML+CSS user agent should implement these requirements by implementing the CSS <code>unicode-bidi</code> property. <a href= "#references">[CSS21]</a> <h4 id="the-ruby"><del class= "diff-old">3.13.</del> <ins class="diff-chg">3.10.22</ins> <del class="diff-old">Edits</del> The <dfn id= "ruby"><code><ins class="diff-new">ruby</ins></code> <del class= "diff-old">ins</del></dfn> <ins class="diff-chg">element</ins></h4> <dl class="element"> <dt><ins class="diff-chg">Categories</ins></dt> <dd><a href="#phrasing0"><ins class="diff-chg">Phrasing content</ins></a> .</dd> <dt><ins class="diff-chg">Contexts in which this element may be used:</ins></dt> <dd><ins class="diff-chg">Where</ins> <a href= "#phrasing0"><ins class="diff-chg">phrasing content</ins></a> <ins class="diff-chg">is expected.</ins></dd> <dt><ins class="diff-chg">Content model:</ins></dt> <dd><ins class="diff-chg">One or more groups of:</ins> <a href= "#phrasing0"><ins class="diff-chg">phrasing content</ins></a> <ins class="diff-chg">followed either by a single</ins> <code><a href="#rt"><ins class="diff-chg">rt</ins></a></code> <ins class="diff-chg">element, or an</ins> <code><a href= "#rp"><ins class="diff-chg">rp</ins></a></code> <ins class= "diff-chg">element, an</ins> <code><a href="#rt"><ins class= "diff-chg">rt</ins></a></code> <ins class="diff-new">element,</ins> and <ins class="diff-new">another</ins> <code><del class= "diff-old">del</del> <a href="#rp"><ins class= "diff-chg">rp</ins></a></code> <del class="diff-old">elements represent edits</del> <ins class="diff-chg">element.</ins></dd> <dt><ins class="diff-chg">Element-specific attributes:</ins></dt> <dd><ins class="diff-chg">None.</ins></dd> <dt><ins class="diff-chg">DOM interface:</ins></dt> <dd><ins class="diff-chg">Uses</ins> <code><a href= "#htmlelement"><ins class="diff-chg">HTMLElement</ins></a></code> .</dd> </dl> <ins class="diff-chg">The</ins> <code><a href= "#ruby"><ins class="diff-chg">ruby</ins></a></code> <ins class= "diff-chg">element allows one or more spans of phrasing content</ins> to <del class="diff-old">the document.</del> <ins class="diff-chg">be marked with ruby annotations.</ins> <del class="diff-old">Since</del> <ins class="diff-chg">A</ins> <code><a href="#ruby"><ins class="diff-chg">ruby</ins></a></code> <ins class="diff-chg">element represents the spans of phrasing content it contains, ignoring all</ins> the <ins class= "diff-new">child</ins> <code><del class="diff-old">ins</del> <a href="#rt"><ins class="diff-chg">rt</ins></a></code> and <code><del class="diff-old">del</del> <a href="#rp"><ins class= "diff-chg">rp</ins></a></code> elements <del class="diff-old">do not affect paragraphing , it</del> <ins class="diff-chg">and their descendants. Those spans of phrasing content have associated annotations created using the</ins> <code><a href="#rt"><ins class= "diff-chg">rt</ins></a></code> <ins class= "diff-chg">element.</ins> <div class="example"> <ins class="diff-chg">In this example, each ideograph in the text</ins> <ins class="diff-chg">斎藤信男</ins> is <del class="diff-old">possible,</del> <ins class= "diff-chg">annotated with its reading.</ins> <pre lang="ja"> ... <ruby><ins class="diff-chg"> 斎 <rt> さい </rt> 藤 <rt> とう </rt> 信 <rt> のぶ </rt> 男 <rt> お </rt> </ruby> ... </ins> </pre> <ins class="diff-chg">This might be rendered as:</ins> <img alt= "The four main ideographs, each with its reading annotation rendered in a smaller font above it." src="images/sample-ruby.png"> </div> <h4 id="the-rt"><ins class= "diff-chg">3.10.23</ins> <ins class="diff-chg">The</ins> <dfn id="rt"><code><ins class="diff-chg">rt</ins></code></dfn> <ins class="diff-chg">element</ins></h4> <dl class="element"> <dt><ins class="diff-chg">Categories</ins></dt> <dd><ins class="diff-chg">None.</ins></dd> <dt><ins class="diff-chg">Contexts</ins> in <del class= "diff-old">some cases where paragraphs are implied</del> <ins class="diff-chg">which this element may be used:</ins></dt> <dd><ins class="diff-chg">As a child of a</ins> <code><a href= "#ruby"><ins class="diff-chg">ruby</ins></a> <del class= "diff-old">(without explicit</del></code> <ins class= "diff-chg">element.</ins></dd> <dt><ins class="diff-chg">Content model:</ins></dt> <dd><a href="#phrasing0"><ins class="diff-chg">Phrasing content</ins></a> .</dd> <dt><ins class="diff-chg">Element-specific attributes:</ins></dt> <dd><ins class="diff-chg">None.</ins></dd> <dt><ins class="diff-chg">DOM interface:</ins></dt> <dd><ins class="diff-chg">Uses</ins> <code><del class= "diff-old">p</del> <a href="#htmlelement"><ins class= "diff-chg">HTMLElement</ins></a></code> .</dd> </dl> <ins class="diff-chg">The</ins> <code><a href="#rt"><ins class= "diff-chg">rt</ins></a></code> <del class="diff-old">elements), for an</del> <ins class="diff-chg">element marks the ruby text component of a ruby annotation.</ins> <ins class="diff-chg">An</ins> <code><del class= "diff-old">ins</del> <a href="#rt"><ins class= "diff-chg">rt</ins></a></code> <del class="diff-old">or</del> <ins class="diff-chg">element that is a child of a</ins> <code><del class="diff-old">del</del> <a href="#ruby"><ins class= "diff-chg">ruby</ins></a></code> element <del class="diff-old">to span both</del> <ins class="diff-chg">represents</ins> an <del class="diff-old">entire paragraph</del> <ins class= "diff-chg">annotation (given by its children) for the zero</ins> or <del class="diff-old">other non-</del> <ins class="diff-chg">more nodes of</ins> phrasing content <ins class="diff-new">that immediately precedes it in the</ins> <code><a href= "#ruby"><ins class="diff-new">ruby</ins></a> <del class= "diff-old">elements and part of another paragraph. For example: <ins> <p> This is a paragraph that was inserted. </p> This is another paragraph whose first sentence was inserted at the same time as the paragraph above. </ins> This is a second sentence, which was there all along. </section></del></code> <ins class="diff-chg">element, ignoring</ins> <code><a href="#rp"><ins class= "diff-chg">rp</ins></a></code> <ins class= "diff-chg">elements.</ins> <del class="diff-old">By only wrapping some paragraphs in</del> <ins class="diff-chg">An</ins> <code><del class="diff-old">p</del> <a href="#rt"><ins class="diff-chg">rt</ins></a></code> <del class= "diff-old">elements, one can even get the end of one paragraph,</del> <ins class="diff-chg">element that is not</ins> a <del class="diff-old">whole second paragraph, and the start</del> <ins class="diff-chg">child</ins> of a <del class="diff-old">third paragraph to be covered by</del> <code><a href="#ruby"><ins class= "diff-chg">ruby</ins></a></code> <ins class="diff-chg">element represents</ins> the same <ins class="diff-new">thing as its children.</ins> <h4 id="the-rp"><ins class= "diff-new">3.10.24</ins> <ins class="diff-new">The</ins> <dfn id="rp"><code><ins class="diff-new">rp</ins></code> <del class="diff-old">ins</del></dfn> <ins class= "diff-chg">element</ins></h4> <dl class="element"> <dt><ins class="diff-chg">Categories</ins></dt> <dd><ins class="diff-chg">None.</ins></dd> <dt><ins class="diff-chg">Contexts in which this element may be used:</ins></dt> <dd><ins class="diff-chg">As a child of a</ins> <code><a href= "#ruby"><ins class="diff-chg">ruby</ins></a></code> <ins class= "diff-new">element, either immediately before</ins> or <ins class= "diff-new">immediately after an</ins> <code><del class= "diff-old">del</del> <a href="#rt"><ins class= "diff-chg">rt</ins></a></code> <ins class= "diff-chg">element.</ins></dd> <dt><ins class="diff-chg">Content model:</ins></dt> <dd><ins class="diff-chg">If the</ins> <code><a href= "#rp"><ins class="diff-chg">rp</ins></a></code> element <del class= "diff-old">(though this</del> is <del class="diff-old">very confusing, and not considered good practice): This is the first paragraph. <ins>This sentence was inserted. <p>This second paragraph was inserted. This sentence was inserted too.</ins> This is the third paragraph in this example. </section></del> <ins class= "diff-chg">immediately after an</ins> <code><a href= "#rt"><ins class="diff-chg">rt</ins></a></code> <ins class= "diff-chg">element that is immediately preceded by another</ins> <code><a href="#rp"><ins class="diff-chg">rp</ins></a></code> <ins class="diff-chg">element: a single character from Unicode character class Pe.</ins></dd> <dd><ins class="diff-chg">Otherwise: a single character from Unicode character class Ps.</ins></dd> <dt><ins class="diff-chg">Element-specific attributes:</ins></dt> <dd><ins class="diff-chg">None.</ins></dd> <dt><ins class="diff-chg">DOM interface:</ins></dt> <dd><ins class="diff-chg">Uses</ins> <code><a href= "#htmlelement"><ins class="diff-chg">HTMLElement</ins></a></code> .</dd> </dl> <del class="diff-old">However, due</del> <ins class= "diff-chg">The</ins> <code><a href="#rp"><ins class= "diff-chg">rp</ins></a></code> <ins class="diff-chg">element can be used</ins> to <del class="diff-old">the way implied paragraphs</del> <ins class="diff-chg">provide parentheses around a ruby text component of a ruby annotation, to be shown by user agents that don't support ruby annotations.</ins> <ins class="diff-chg">An</ins> <code><a href="#rp"><ins class= "diff-chg">rp</ins></a> <del class="diff-old">are defined, it</del></code> <ins class="diff-chg">element that</ins> is <del class="diff-old">not possible to mark up the end</del> <ins class="diff-chg">a child</ins> of <del class="diff-old">one paragraph</del> <ins class="diff-chg">a</ins> <code><a href= "#ruby"><ins class="diff-chg">ruby</ins></a></code> <ins class= "diff-chg">element represents nothing</ins> and <del class= "diff-old">the start of the very next one using the same</del> <ins class="diff-chg">it and its contents must be ignored. An</ins> <code><del class="diff-old">ins</del> <a href="#rp"><ins class= "diff-chg">rp</ins></a></code> <del class="diff-old">or</del> <ins class="diff-chg">element whose parent element is not a</ins> <code><del class="diff-old">del</del> <a href="#ruby"><ins class= "diff-chg">ruby</ins></a></code> <del class="diff-old">element. You instead have</del> <ins class="diff-chg">element represents the same thing as its children.</ins> <div class="example"> <ins class="diff-chg">The example above, in which each ideograph in the text</ins> <ins class= "diff-chg">斎藤信男</ins> <ins class="diff-chg">is annotated with its reading, could be expanded</ins> to use <del class= "diff-old">one (or two)</del> <code><del class="diff-old">p</del> <a href="#rp"><ins class="diff-chg">rp</ins></a></code> <del class= "diff-old">element(s) and two</del> <ins class="diff-chg">so that in legacy user agentthe readings are in parentheses:</ins> <pre lang="ja"> ... <ruby><ins class="diff-chg"> 斎 <rp>(</rp><rt>さい</rt><rp>)</rp> 藤 <rp>(</rp><rt>とう</rt><rp>)</rp> 信 <rp>(</rp><rt>のぶ</rt><rp>)</rp> 男 <rp>(</rp><rt>お</rt><rp>)</rp> </ruby> ... </ins> </pre> <ins class="diff-chg">In conforming user agents the rendering would be as above, but in user agents that do not support ruby, the rendering would be:</ins> <pre ins="" class="diff-chg"> lang=ja>... 斎 (さい) 藤 (とう) 信 (のぶ) 男 (お) ... </pre></div> <h4 id="usage"><del class="diff-old">ins</del> <ins class="diff-chg">3.10.25</ins> <ins class= "diff-chg">Usage summary</ins></h4> <ins class="diff-chg">We need to summarize the various elements, in particular to distinguish b/i/em/strong/var/q/mark/cite.</ins> <h4 id="footnotes"><ins class= "diff-chg">3.10.26</ins> <ins class= "diff-chg">Footnotes</ins></h4> <ins class="diff-chg">HTML does not have a dedicated mechanism for marking up footnotes. Here are the recommended alternatives.</ins> <ins class="diff-chg">For short inline annotations, the</ins> <code title="attr-title"><a href="#title"><ins class= "diff-chg">title</ins></a></code> <del class="diff-old">or</del> <ins class="diff-chg">attribute should be used.</ins> <div class="example"> <ins class="diff-chg">In this example, two parts of a dialog are annotated.</ins> <pre> <dialog><ins class="diff-chg"> <dt>Customer <dd>Hello! I wish to register a complaint. Hello. Miss? <dt>Shopkeeper <dd><span title="Colloquial pronunciation of 'What do you'" >Watcha mean, miss? <dt>Customer <dd>Uh, I'm sorry, I have a cold. I wish to make a complaint. <dt>Shopkeeper <dd>Sorry, <span title="This is, of course, a lie.">we're closing for lunch. </dialog> </ins> </pre></div> <ins class="diff-chg">For longer annotations, the</ins> <code><del class="diff-old">del</del> <a href="#a"><ins class= "diff-chg">a</ins></a></code> <del class="diff-old">elements:</del> <ins class="diff-chg">element should be used, pointing to an element later in the document. The convention is that the contents of the link be a number in square brackets.</ins> <div class="example"> <del class="diff-old">For example:</del> <ins class= "diff-chg">In this example, a footnote in the dialog links to a paragraph below the dialog. The paragraph then reciprocally links back to the dialog, allowing the user to return to the location of the footnote.</ins> <del class="diff-old"><p>This is the first paragraph. <del>This sentence was deleted. <p><del>This sentence was deleted too.</del> That sentence needed a separate &lt;del> element.</del> <pre> <dialog> <ins class="diff-chg"> <dt>Announcer <dd>Number 16: The <i>hand. <dt>Interviewer <dd>Good evening. I have with me in the studio tonight Mr Norman St John Polevaulter, who for the past few years has been contradicting people. Mr Polevaulter, why <em>do you contradict people? <dt>Norman <dd>I don't. <a href="#fn1" id="r1">[1]</a> <dt>Interviewer <dd>You told me you did! </dialog> <section> <p id="fn1"><a href="#r1">[1]</a> This is, naturally, a lie, but paradoxically if it were true he could not say so without contradicting the interviewer and thus making it false. </ins> </section> </pre></div> <del class="diff-old">Partly because</del> <ins class= "diff-chg">For side notes, longer annotations that apply to entire sections</ins> of the <del class="diff-old">confusion described above, authors are strongly recommended to always mark up all paragraphs with</del> <ins class="diff-chg">text rather than just specific words or sentences,</ins> the <code><del class= "diff-old">p</del> <a href="#aside"><ins class= "diff-chg">aside</ins></a></code> <del class="diff-old">element, and</del> <ins class="diff-chg">element should be used.</ins> <div class="example"> <ins class="diff-chg">In this example, a sidebar is given after a dialog, giving some context</ins> to <del class="diff-old">not have any</del> <ins class="diff-chg">the dialog.</ins> <pre> <dialog><ins class="diff-chg"> <dt>Customer <dd>I will not buy this record, it is scratched. <dt>Shopkeeper <dd>I'm sorry? <dt>Customer <dd>I will not buy this record, it is scratched. <dt>Shopkeeper <dd>No no no, this's'a tobacconist's. </dialog> <aside> <p>In 1970, the British Empire lay in ruins, and foreign nationalists frequented the streets — many of them Hungarians (not the streets — the foreign nationals). Sadly, Alexander Yalt has been publishing incompetently-written phrase books. </aside> </ins> </pre></div> <h3 id="edits"><ins class= "diff-chg">3.11</ins> <ins class="diff-chg">Edits</ins></h3> <ins class="diff-chg">The</ins> <code><a href= "#ins">ins</a></code> <del class="diff-old">or</del> <ins class= "diff-chg">and</ins> <code><a href="#del">del</a></code> elements <del class="diff-old">that cross across any implied paragraphs .</del> <ins class="diff-chg">represent edits to the document.</ins> <h4 id="the-ins"><del class= "diff-old">3.13.1.</del> <ins class="diff-chg">3.11.1</ins> The <dfn id="ins"><code>ins</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>When the element only contains <a href="#phrasing0">phrasing content</a> : <a href="#phrasing0">phrasing content</a> .</dd> <dd>Otherwise: <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>When the element only contains <a href="#phrasing0">phrasing content</a> : where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dd>Otherwise: where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#transparent0">Transparent</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-mod-cite"><a href= "#cite3">cite</a></code></dd> <dd><code title="attr-mod-datetime"><a href= "#datetime1">datetime</a></code></dd> <dt>DOM interface:</dt> <dd>Uses the <code><a href= "#htmlmodelement">HTMLModElement</a></code> interface.</dd> </dl> The <code><a href="#ins">ins</a></code> element represents an addition to the document. <div class="example"> The following represents the addition of a single paragraph: <pre> <aside> <ins> <p> I like fruit. </p> </ins> </aside> </pre> As does this, because everything in the <code><a href= "#aside">aside</a></code> element here counts as <a href= "#phrasing0">phrasing content</a> and therefore there is just one <a href="#paragraph">paragraph</a> : <pre> <aside> <ins> Apples are <em>tasty. </ins> <ins> So are pears. </ins> </aside> </pre></div> <code><a href="#ins">ins</a></code> elements should not cross <a href="#paragraph" title="paragraph">implied paragraph</a> boundaries. <div class="example"> The following example represents the addition of two paragraphs, the second of which was inserted in two parts. The first <code><a href="#ins">ins</a></code> element in this example thus crosses a paragraph boundary, which is considered poor form. <pre> <aside> <ins datetime="2005-03-16T00:00Z"> <p> I like fruit. </p> Apples are <em>tasty. </ins> <ins datetime="2007-12-19T00:00Z"> So are pears. </ins> </aside> </pre> Here is a better way of marking this up. It uses more elements, but none of the elements cross implied paragraph boundaries. <pre> <aside> <ins datetime="2005-03-16T00:00Z"> <p> I like fruit. </p> </ins> <ins datetime="2005-03-16T00:00Z"> Apples are <em>tasty. </ins> <ins datetime="2007-12-19T00:00Z"> So are pears. </ins> </aside> </pre></div> <h4 id="the-del"><del class= "diff-old">3.13.2.</del> <ins class="diff-chg">3.11.2</ins> The <dfn id="del"><code>del</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>When the element only contains <a href="#phrasing0">phrasing content</a> : <a href="#phrasing0">phrasing content</a> .</dd> <dd>Otherwise: <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>When the element only contains <a href="#phrasing0">phrasing content</a> : where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dd>Otherwise: where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#transparent0">Transparent</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-mod-cite"><a href= "#cite3">cite</a></code></dd> <dd><code title="attr-mod-datetime"><a href= "#datetime1">datetime</a></code></dd> <dt>DOM interface:</dt> <dd>Uses the <code><a href= "#htmlmodelement">HTMLModElement</a></code> interface.</dd> </dl> The <code><a href="#del">del</a></code> element represents a removal from the document. <code><a href="#del">del</a></code> elements should not cross <a href="#paragraph" title="paragraph">implied paragraph</a> boundaries. <h4 id="attributes"><del class= "diff-old">3.13.3.</del> <ins class="diff-chg">3.11.3</ins> Attributes common to <code><a href="#ins">ins</a></code> and <code><a href="#del">del</a></code> elements</h4> The <dfn id="cite3" title= "attr-mod-cite"><code>cite</code></dfn> attribute may be used to specify a URI that explains the change. When that document is long, for instance the minutes of a meeting, authors are encouraged to include a fragment identifier pointing to the specific part of that document that discusses the change. If the <code title="attr-mod-cite"><a href= "#cite3">cite</a></code> attribute is present, it must be a URI (or IRI) that explains the change. User agents should allow users to follow such citation links. The <dfn id="datetime1" title= "attr-mod-datetime"><code>datetime</code></dfn> attribute may be used to specify the time and date of the change. If present, the <code title="attr-mod-datetime"><a href= "#datetime1">datetime</a></code> attribute must be a <a href= "#valid5">valid datetime</a> value. User agents must parse the <code title= "attr-mod-datetime"><a href="#datetime1">datetime</a></code> attribute according to the <a href="#datetime-parser">parse a string as a datetime value</a> algorithm. If that doesn't return a time, then the modification has no associated timestamp (the value is non-conforming; it is not a <a href="#valid5">valid datetime</a> ). Otherwise, the modification is marked as having been made at the given datetime. User agents should use the associated timezone information to determine which timezone to present the given datetime in. The <code><a href="#ins">ins</a></code> and <code><a href= "#del">del</a></code> elements must implement the <code><a href= "#htmlmodelement">HTMLModElement</a></code> interface: <pre class="idl"> interface <dfn id="htmlmodelement">HTMLModElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute DOMString <a href="#cite4" title= "dom-mod-cite">cite</a>; attribute DOMString <a href="#datetime2" title= "dom-mod-datetime">dateTime</a>; }; </pre> The <dfn id="cite4" title="dom-mod-cite"><code>cite</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the element's <del class="diff-old">> <code title=attr-mod-cite></del> <code title="attr-mod-cite"><del class="diff-old"><a href="#cite3"></del> <a href="#cite3">cite</a></code> content attribute. The <dfn id="datetime2" title= "dom-mod-datetime"><code>dateTime</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the element's <code title= "">datetime</code> content attribute. <h4 id="edits0"><ins class= "diff-new">3.11.4</ins> <ins class="diff-new">Edits and paragraphs</ins></h4> <ins class="diff-new">Since the</ins> <code><a href= "#ins"><ins class="diff-new">ins</ins></a></code> <ins class= "diff-new">and</ins> <code><a href="#del"><ins class= "diff-new">del</ins></a></code> <ins class="diff-new">elements do not affect</ins> <a href="#paragraph" title="paragraph"><ins class= "diff-new">paragraphing</ins></a> ,<ins class="diff-new">it is possible, in some cases where paragraphs are</ins> <a href= "#paragraph" title="paragraph"><ins class= "diff-new">implied</ins></a> <ins class="diff-new">(without explicit</ins> <code><a href="#p"><ins class= "diff-new">p</ins></a></code> <ins class="diff-new">elements), for an</ins> <code><a href="#ins"><ins class= "diff-new">ins</ins></a></code> <ins class="diff-new">or</ins> <code><a href="#del"><ins class="diff-new">del</ins></a></code> <ins class="diff-new">element to span both an entire paragraph or other non-</ins> <a href="#phrasing0"><ins class= "diff-new">phrasing content</ins></a> <ins class= "diff-new">elements and part of another paragraph.</ins> <ins class="diff-new">For example:</ins> <pre> <section><ins class="diff-new"> <ins> <p> This is a paragraph that was inserted. </p> This is another paragraph whose first sentence was inserted at the same time as the paragraph above. </ins> This is a second sentence, which was there all along. </section> </ins> </pre> <ins class="diff-new">By only wrapping some paragraphs in</ins> <code><a href="#p"><ins class="diff-new">p</ins></a></code> <ins class="diff-new">elements, one can even get the end of one paragraph, a whole second paragraph, and the start of a third paragraph to be covered by the same</ins> <code><a href= "#ins"><ins class="diff-new">ins</ins></a></code> <ins class= "diff-new">or</ins> <code><a href="#del"><ins class= "diff-new">del</ins></a></code> <ins class="diff-new">element (though this is very confusing, and not considered good practice):</ins> <pre> <section><ins class="diff-new"> This is the first paragraph. <ins>This sentence was inserted. <p>This second paragraph was inserted. This sentence was inserted too.</ins> This is the third paragraph in this example. </section> </ins> </pre> <ins class="diff-new">However, due to the way</ins> <a href= "#paragraph" title="paragraph"><ins class="diff-new">implied paragraphs</ins></a> <ins class="diff-new">are defined, it is not possible to mark up the end of one paragraph and the start of the very next one using the same</ins> <code><a href="#ins"><ins class= "diff-new">ins</ins></a></code> <ins class="diff-new">or</ins> <code><a href="#del"><ins class="diff-new">del</ins></a></code> <ins class="diff-new">element. You instead have to use one (or two)</ins> <code><a href="#p"><ins class= "diff-new">p</ins></a></code> <ins class="diff-new">element(s) and two</ins> <code><a href="#ins"><ins class= "diff-new">ins</ins></a></code> <ins class="diff-new">or</ins> <code><a href="#del"><ins class="diff-new">del</ins></a></code> <ins class="diff-new">elements:</ins> <ins class="diff-new">For example:</ins> <pre> <section><ins class="diff-new"> <p>This is the first paragraph. <del>This sentence was deleted.</del></p> <p><del>This sentence was deleted too.</del> That sentence needed a separate &lt;del&gt; element. </section> </ins> </pre> <ins class="diff-new">Partly because of the confusion described above, authors are strongly recommended to always mark up all paragraphs with the</ins> <code><a href="#p"><ins class= "diff-new">p</ins></a></code> <ins class="diff-new">element, and to not have any</ins> <code><a href="#ins"><ins class= "diff-new">ins</ins></a></code> <ins class="diff-new">or</ins> <code><a href="#del"><ins class="diff-new">del</ins></a></code> <ins class="diff-new">elements that cross across any</ins> <a href= "#paragraph" title="paragraph"><ins class="diff-new">implied paragraphs</ins></a> . <h4 id="edits1"><ins class= "diff-new">3.11.5</ins> <ins class="diff-new">Edits and lists</ins></h4> <ins class="diff-new">The content models of the</ins> <code><a href="#ol"><ins class="diff-new">ol</ins></a></code> <ins class="diff-new">and</ins> <code><a href="#ul"><ins class= "diff-new">ul</ins></a></code> <ins class="diff-new">elements do not allow</ins> <code><a href="#ins"><ins class= "diff-new">ins</ins></a></code> <ins class="diff-new">and</ins> <code><a href="#del"><ins class="diff-new">del</ins></a></code> <ins class="diff-new">elements as children. Lists always represent all their items, including items that would otherwise have been marked as deleted.</ins> <ins class="diff-new">To indicate that an item is inserted or deleted, an</ins> <code><a href="#ins"><ins class= "diff-new">ins</ins></a></code> <ins class="diff-new">or</ins> <code><a href="#del"><ins class="diff-new">del</ins></a></code> <ins class="diff-new">element can be wrapped around the contents of the</ins> <code><a href="#li"><ins class= "diff-new">li</ins></a></code> <ins class="diff-new">element. To indicate that an item has been replaced by another, a single</ins> <code><a href="#li"><ins class="diff-new">li</ins></a></code> <ins class="diff-new">element can have one or more</ins> <code><a href="#del"><ins class="diff-new">del</ins></a></code> <ins class="diff-new">elements followed by one or more</ins> <code><a href="#ins"><ins class="diff-new">ins</ins></a></code> <ins class="diff-new">elements.</ins> <div class="example"> <ins class="diff-new">In the following example, a list that started empty had items added and removed from it over time. The bits in the example that have been emphasised show the parts that are the "current" state of the list. The list item numbers don't take into account the edits, though.</ins> <pre> <h1>Stop-ship bugs</h1><ins class="diff-new"> <ol> <li><ins datetime="2008-02-12 15:20 Z">Bug 225: Rain detector doesn't work in snow</ins></li> <li><del datetime="2008-03-01 20:22 Z"><ins datetime="2008-02-14 12:02 Z">Bug 228: Water buffer overflows in April</ins></del></li> <li><ins datetime="2008-02-16 13:50 Z">Bug 230: Water heater doesn't use renewable fuels</ins></li> <li><del datetime="2008-02-20 21:15 Z"><ins datetime="2008-02-16 14:25 Z">Bug 232: Carbon dioxide emissions detected after startup</ins></del></li> </ol> </ins> </pre></div> <div class="example"> <ins class="diff-new">In the following example, a list that started with just fruit was replaced by a list with just colors.</ins> <pre> <h1>List of <del>fruits</del><ins>colors</ins></h1><ins class="diff-new"> <ul> <li><del>Lime</del><ins>Green</ins></li> <li><del>Apple</del></li> <li>Orange</li> <li><del>Pear</del></li> <li><ins>Teal</ins></li> <li><del>Lemon</del><ins>Yellow</ins></li> <li>Olive</li> <li><ins>Purple</ins> </ul> </ins> </pre></div> <h3 id="embedded0"><del class= "diff-old">3.14.</del> <ins class="diff-chg">3.12</ins> Embedded content</h3> <h4 id="the-figure"><del class= "diff-old">3.14.1.</del> <ins class="diff-chg">3.12.1</ins> The <dfn id="figure"><code>figure</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dd><a href="#sectioning1"><ins class="diff-new">Sectioning root</ins></a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Either</del> <ins class= "diff-chg">Either:</ins> one <code><a href= "#legend">legend</a></code> element followed by <del class= "diff-old">prose</del> <a href="#flow-content0"><ins class= "diff-chg">flow</ins> content</a> .</dd> <dd>Or: <del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> followed by one <code><a href="#legend">legend</a></code> element.</dd> <dd><ins class="diff-new">Or:</ins> <a href= "#flow-content0"><ins class="diff-new">Flow content</ins></a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#figure">figure</a></code> element represents some <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> , <ins class="diff-chg">optionally</ins> with a <del class= "diff-old">caption.</del> <ins class="diff-chg">caption, which can be moved away from the main flow of the document without affecting the document's meaning.</ins> <ins class="diff-chg">The element can thus be used to annotate illustrations, diagrams, photos, code listings, etc, that are referred to from the main content of the document, but that could, without affecting the flow of the document, be moved away from that primary content, e.g. to the side of the page, to dedicated pages, or to an appendix.</ins> The first <code><a href="#legend">legend</a></code> element child of the element, if any, represents the caption of the <code><a href="#figure">figure</a></code> element's contents. If there is no child <code><a href="#legend">legend</a></code> element, then there is no caption. The remainder of the element's contents, if any, represents the <del class="diff-old">captioned</del> content. <div class="example"> <ins class="diff-new">This example shows the</ins> <code><a href="#figure"><ins class= "diff-new">figure</ins></a></code> <ins class="diff-new">element to mark up a code listing.</ins> <pre> <p>In <a href="#l4">listing 4</a> we see the primary core interface<ins class="diff-new"> API declaration. <figure id="l4"> <legend>Listing 4. The primary core interface API declaration.</legend> <pre><code>interface PrimaryCore { boolean verifyDataLine(); void sendData(in sequence&lt;byte> data); void initSelfDestruct(); }</code></pre> </figure> <p> The API is designed to use UTF-8. </ins> </pre></div> <div class="example"> <ins class="diff-new">Here we see a</ins> <code><a href= "#figure"><ins class="diff-new">figure</ins></a></code> <ins class= "diff-new">element to mark up a photo.</ins> <pre> <figure><ins class="diff-new"> <img src="bubbles-work.jpeg" alt="Bubbles, sitting in his office chair, works on his latest project intently."> <legend>Bubbles at work</legend> </figure> </ins> </pre></div> <div class="example"> <ins class="diff-new">In this example, we see an image that is</ins> <ins class="diff-new">not</ins> <ins class= "diff-new">a figure, as well as an image and a video that are.</ins> <pre> <h2>Malinko's comics</h2><ins class="diff-new"> <p>This case centered on some sort of "intellectual property" infringement related to a comic (see Exhibit A). The suit started after a trailer ending with these words:</p> <img src="promblem-packed-action.png" alt="ROUGH COPY! Promblem-Packed Action!"> <p>...was aired. A lawyer, armed with a Bigger Notebook, launched a preemptive strike using snowballs. A complete copy of the trailer is included with Exhibit B. <figure> <img src="ex-a.png" alt="Two squiggles on a dirty piece of paper."> <legend>Exhibit A. The alleged <cite>rough copy</cite> comic.</legend> </figure> <figure> <video src="ex-b.mov"></video> <legend>Exhibit A. The alleged <cite>rough copy</cite> comic.</legend> </figure> <p> The case was resolved out of court. </ins> </pre></div> <div class="example"> <ins class="diff-new">Here, a part of a poem is marked up using</ins> <code><a href="#figure"><ins class= "diff-new">figure</ins></a></code> . <pre> <figure><ins class="diff-new"> <p>'Twas brillig, and the slithy toves Did gyre and gimble in the wabe;<br> All mimsy were the borogoves,<br> And the mome raths outgrabe. <legend><cite>Jabberwocky</cite> (first verse). Lewis Carroll, 1832-98</legend> </figure> </ins> </pre></div> <div class="example"> <ins class="diff-new">In this example, which could be part of a much larger work discussing a castle, the figure has three images in it.</ins> <pre> <figure><ins class="diff-new"> <img src="castle1423.jpeg" title="Etching. Anonymous, ca. 1423." alt="The castle has one tower, and a tall wall around it."> <img src="castle1858.jpeg" title="Oil-based paint on canvas. Maria Towle, 1858." alt="The castle now has two towers and two walls."> <img src="castle1999.jpeg" title="Film photograph. Peter Jankle, 1999." alt="The castle lies in ruins, the original tower all that remains in one piece."> <legend>The castle through the ages: 1423, 1858, and 1999 respectively.</legend> </figure> </ins> </pre></div> <h4 id="the-img"><del class= "diff-old">3.14.2.</del> <ins class="diff-chg">3.12.2</ins> The <dfn id="img"><code>img</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#embedded1">Embedded content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#embedded1">embedded content</a> is expected.</dd> <dt>Content model:</dt> <dd>Empty.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-img-alt"><a href="#alt">alt</a></code></dd> <dd><code title="attr-img-src"><a href="#src">src</a></code></dd> <dd><code title="attr-hyperlink-usemap"><a href= "#usemap1">usemap</a></code></dd> <dd><code title="attr-img-ismap"><a href= "#ismap">ismap</a></code></dd> <dd><code title="attr-dim-width"><a href= "#width4">width</a></code></dd> <dd><code title="attr-dim-height"><a href= "#height3">height</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlimageelement">HTMLImageElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute DOMString <a href="#alt0" title= "dom-img-alt">alt</a>; attribute DOMString <a href="#src0" title= "dom-img-src">src</a>; attribute DOMString <a href="#usemap" title= "dom-img-useMap">useMap</a>; attribute boolean <a href="#ismap0" title= "dom-img-isMap">isMap</a>; attribute long <a href="#width" title= "dom-img-width">width</a>; attribute long <a href="#height" title= "dom-img-height">height</a>; readonly attribute boolean <a href="#complete" title= "dom-img-complete">complete</a>; }; </pre> An instance of <code><a href= "#htmlimageelement">HTMLImageElement</a></code> can be obtained using the <code title="dom-image"><a href= "#image0">Image</a></code> constructor. </dd> </dl> An <code><a href="#img">img</a></code> element represents an image. The image given by the <dfn id="src" title= "attr-img-src"><code>src</code></dfn> attribute is the embedded content, and the value of the <dfn id="alt" title= "attr-img-alt"><code>alt</code></dfn> attribute is the <code><a href="#img">img</a></code> element's <a href= "#fallback">fallback content</a> . Authoring requirements : The <code title= "attr-img-src"><a href="#src">src</a></code> attribute must be present, and must contain a URI (or IRI). Should we restrict the URI to pointing to an image? What's an image? Is PDF an image? (Safari supports PDFs in <img> elements.) How about SVG? (Opera supports those). WMFs? XPMs? HTML? The requirements for the <code title="attr-img-alt"><a href= "#alt">alt</a></code> attribute depend on what the image is intended to represent: <dl> <dt>A phrase or paragraph with an alternative graphical representation</dt> <dd> Sometimes something can be more clearly stated in graphical form, for example as a flowchart, a diagram, a graph, or a simple map showing directions. In such cases, an image can be given using the <code><a href="#img">img</a></code> element, but the lesser textual version must still be given, so that users who are unable to view the image (e.g. because they have a very slow connection, or because they are using a text-only browser, or because they are listening to the page being read out by a hands-free automobile voice Web browser, or simply because they are blind) are still able to understand the message being conveyed. The text must be given in the <code title= "attr-img-alt"><a href="#alt">alt</a></code> attribute, and must convey the same message as the <del class="diff-old">the</del> image specified in the <code title="attr-img-src"><a href= "#src">src</a></code> attribute. <div class="example"> In the following example we have <a href= "images/parsing-model-overview.png">a flowchart</a> in image form, with text in the <code title="attr-img-alt"><a href= "#alt">alt</a></code> attribute rephrasing the flowchart in prose form: <pre> <p>In the common case, the data handled by the tokenisation stage comes from the network, but it can also come from script. <p><img src="images/parsing-model-overview.png" alt="The network passes data to the Tokeniser stage, which passes data to the Tree Construction stage. From there, data goes to both the DOM and to Script Execution. Script Execution is linked to the DOM, and, using document.write(), passes data to the Tokeniser.">  </p> </pre></div> <div class="example"> Here's another example, showing a good solution and a bad solution to the problem of including an image in a description. First, here's the good solution. This sample shows how the alternative text should just be what you would have put in the prose if the image had never existed. <pre> <!-- This is the correct way to do things. --> <p> You are standing in an open field west of a house. <img src="house.jpeg" alt="The house is white, with a boarded front door."> There is a small mailbox here. </p> </pre> Second, here's the bad solution. In this incorrect way of doing things, the alternative text is simply a description of the image, instead of a textual replacement for the image. It's bad because when the image isn't shown, the text doesn't flow as well as in the first example. <del class="diff-old"></del> <pre class="bad"> <!-- This is the wrong way to do things. --> <p> You are standing in an open field west of a house. <img src="house.jpeg" alt="A white house, with a boarded front door."> There is a small mailbox here. </p> </pre></div> It is important to <del class="diff-old">realise</del> <ins class="diff-chg">realize</ins> that the alternative text is a replacement for the image, not a description of the image. </dd> <dt>Icons: a short phrase or label with an alternative graphical representation</dt> <dd> A document can contain information in iconic form. The icon is intended to help users of visual browsers to <del class= "diff-old">recognise</del> <ins class="diff-chg">recognize</ins> features at a glance. In some cases, the icon is supplemental to a text label conveying the same meaning. In those cases, the <code title= "attr-img-alt"><a href="#alt">alt</a></code> attribute must be present but must be empty. <div class="example"> Here the icons are next to text that conveys the same meaning, so they have an empty <code title="attr-img-alt"><a href= "#alt">alt</a></code> attribute: <pre> <nav> <p><a href="/help/"><img src="/icons/help.png" alt=""> Help</a></p> <p><a href="/configure/"><img src="/icons/configuration.png" alt=""> Configuration Tools</a></p> </nav> </pre></div> In other cases, the icon has no text next to it describing what it means; the icon is supposed to be self-explanatory. In those cases, an equivalent textual label must be given in the <code title="attr-img-alt"><a href="#alt">alt</a></code> attribute. <div class="example"> Here, posts on a news site are <del class= "diff-old">labelled</del> <ins class="diff-chg">labeled</ins> with an icon indicating their topic. <pre> <body> <article> <header> <h1>Ratatouille wins <i>Best Movie of the Year award</h1> <p><img src="movies.png" alt="Movies"></p> </header> <p>Pixar has won yet another <i>Best Movie of the Year award, making this its 8th win in the last 12 years. </article> <article> <header> <h1>Latest TWiT episode is online</h1> <p><img src="podcasts.png" alt="Podcasts"></p> </header> <p>The latest TWiT episode has been posted, in which we hear several tech news stories as well as learning much more about the iPhone. This week, the panelists compare how reflective their iPhones' Apple logos are. </article> </body> </pre></div> Many pages include logos, insignia, flags, or emblems, which stand for a particular entity such as a company, <del class= "diff-old">organisation,</del> <ins class= "diff-chg">organization,</ins> project, band, software package, country, or some such. If the logo is being used to represent the entity, the <code title="attr-img-alt"><a href="#alt">alt</a></code> attribute must contain the name of the entity being represented by the logo. The <code title="attr-img-alt"><a href="#alt">alt</a></code> attribute must not contain text like the word "logo", as it is not the fact that it is a logo that is being conveyed, it's the entity itself. If the logo is being used next to the name of the entity that it represents, then the logo is supplemental, and its <code title= "attr-img-alt"><a href="#alt">alt</a></code> attribute must instead be empty. If the logo is merely used as decorative material (as branding, or, for example, as a side image in an article that mentions the entity to which the logo belongs), then the entry below on purely decorative images applies. If the logo is actually being discussed, then it is being used as a phrase or paragraph (the description of the logo) with an alternative graphical representation (the logo itself), and the first entry above applies. <div class="example"> In the following snippets, all four of the above cases are present. First, we see a logo used to represent a company: <pre> <h1>  <img src="XYZ.gif" alt="The XYZ company">  </h1> </pre> Next, we see a paragraph which uses a logo right next to the company name, and so doesn't have any alternative text: <pre> <article> <h2>News</h2> <p>We have recently been looking at buying the <img src="alpha.gif" alt=""> ΑΒΓ company, a small Greek company <del class="diff-old">specialising </del> <ins class="diff-chg">specializing </ins> in our type of product. </pre> In this third snippet, we have a logo being used in an aside, as part of the larger article discussing the acquisition: <pre> <aside><p><img src="alpha-large.gif" alt=""></p></aside> <p>The ΑΒΓ company has had a good quarter, and our pie chart studies of their accounts suggest a much bigger blue slice than its green and orange slices, which is always a good sign. </article> </pre> Finally, we have an opinion piece talking about a logo, and the logo is therefore described in detail in the alternative text. <pre> <p>Consider for a moment their logo:</p> <p><img src="/images/logo" alt="It consists of a green circle with a green question mark centered inside it."></p> <p>How unoriginal can you get? I mean, oooooh, a question mark, how <em>revolutionary, how utterly <em>ground-breaking, I'm sure everyone will rush to adopt those specifications now! They could at least have tried for some sort of, I don't know, sequence of rounded squares with varying shades of green and bold white outlines, at least that would look good on the cover of a blue book. </pre> This example shows how the alternative text should be written such that if the image isn't available, and the text is used instead, the text flows seamlessly into the surrounding text, as if the image had never been there in the first place. </div> </dd> <dt>A graphical representation of some of the surrounding text</dt> <dd> In many cases, the image is actually just supplementary, and its presence merely reinforces the surrounding text. In these cases, the <code title="attr-img-alt"><a href="#alt">alt</a></code> attribute must be present but its value must be the empty string. <div class="example"> A flowchart that repeats the previous paragraph in graphical form: <pre> <p>The network passes data to the Tokeniser stage, which passes data to the Tree Construction stage. From there, data goes to both the DOM and to Script Execution. Script Execution is linked to the DOM, and, using document.write(), passes data to the Tokeniser.  <p> <img src="images/parsing-model-overview.png" alt=""> </p>  </pre></div> <div class="example"> A graph that repeats the previous paragraph in graphical form: <pre> <p>According to a study covering several billion pages, about 62% of documents on the Web in 2007 triggered the Quirks rendering mode of Web browsers, about 30% triggered the Almost Standards mode, and about 9% triggered the Standards mode.  <p> <img src="rendering-mode-pie-chart.png" alt=""> </p>  </pre></div> In general, an image falls into this category if removing the image doesn't make the page any less useful, but including the image makes it a lot easier for users of visual browsers to understand the concept. </dd> <dt>A purely decorative image that doesn't add any information but is still specific to the surrounding content</dt> <dd> In some cases, the image isn't discussed by the surrounding text, but it has some relevance. Such images are decorative, but still form part of the content. In these cases, the <code title= "attr-img-alt"><a href="#alt">alt</a></code> attribute must be present but its value must be the empty string. <div class="example"> Examples where the image is purely decorative despite being relevant would include things like a photo of the Black Rock City landscape in a blog post about an event at Burning Man, or an image of a painting inspired by a poem, on a page reciting that poem. The following snippet shows an example of the latter case (only the first verse is included in this snippet): <pre> <h1>The Lady of Shalott</h1> <p><img src="shalott.jpeg" alt=""></p> <p>On either side the river lie Long fields of barley and of rye,<br> That clothe the wold and meet the sky;<br> And through the field the road run by To many-tower'd Camelot;<br> And up and down the people go,<br> Gazing where the lilies blow Round an island there below,<br> The island of Shalott. </pre></div> In general, if an image is decorative but isn't especially page-specific, for example an image that forms part of a site-wide design scheme, the image should be specified in the site's CSS, not in the markup of the document. </dd> <dt>A key part of the content <del class="diff-old">that doesn't have an obvious textual alternative</del></dt> <dd> In <del class="diff-old">certain rare</del> <ins class= "diff-chg">some</ins> cases, the image is <del class= "diff-old">simply</del> a critical part of the <del class= "diff-old">content, and</del> <ins class="diff-chg">content. This could be the case, for instance, on a page that is part of a photo gallery. The image is the whole</ins> <ins class= "diff-chg">point</ins> <ins class="diff-chg">of the page containing it.</ins> <ins class="diff-chg">When it is possible for alternative text to be provided, for example if the image is part of a series of screenshots in a magazine review, or part of a comic strip, or is a photograph in a blog entry about that photograph, text that conveys can serve as a substitute for the image must be given as the contents of the</ins> <code title="attr-img-alt"><a href= "#alt"><ins class="diff-chg">alt</ins></a></code> <ins class= "diff-chg">attribute.</ins> <ins class="diff-chg">In a rare subset of these cases,</ins> there might <del class="diff-old">even</del> be no alternative text available. This could be the case, for instance, <del class= "diff-old">in</del> <ins class="diff-chg">on</ins> a photo <del class="diff-old">gallery, where a user</del> <ins class= "diff-chg">upload site, if the site</ins> has <del class= "diff-old">uploaded 3000</del> <ins class="diff-chg">received 8000</ins> photos from a <del class="diff-old">vacation trip,</del> <ins class="diff-chg">user</ins> without <del class= "diff-old">providing any descriptions of</del> the <del class= "diff-old">images. The images are the whole point</del> <ins class= "diff-chg">user annotating any</ins> of <del class="diff-old">the pages containing</del> them. In such cases, the <code title= "attr-img-alt"><a href="#alt">alt</a></code> attribute may be omitted, but the <code title="attr-img-alt"><a href= "#alt">alt</a></code> attribute should be included, with a useful value, if at all possible. <del class="diff-old">If</del> <ins class="diff-chg">In any case, if</ins> an image is a key part of the content, the <code title="attr-img-alt"><a href= "#alt">alt</a></code> attribute must not be specified with an empty value. <div class="example"> A <del class="diff-old">photo on a photo-sharing site: <legend>Bubbles traveled everywhere with us.</legend> </figure> A</del> screenshot in a gallery of screenshots for a new <del class="diff-old">OS:</del> <ins class="diff-chg">OS, with some alternative text:</ins> <pre> <figure> <del class="diff-old"> </del> <img src="KDE%20Light%20desktop.png" <ins class= "diff-chg"> alt="The desktop is blue, with icons along the left hand side in two columns, reading System, Home, K-Mail, etc. A window is open showing that menus wrap to a second line if they cannot fit in the window. The window has a list of icons along the top, with an address bar below it, a list of icons for tabs along the left edge, a status bar on the bottom, and two panes in the middle. The desktop has a bar at the bottom of the screen with a few buttons, a pager, a list of open applications, and a clock."></ins>  <legend>Screenshot of a KDE desktop.</legend> </figure> </pre> <ins class="diff-new">A photo on a photo-sharing site, if the site received the image with no metadata other than the caption:</ins> <pre> <figure> <img src="1100670787_6a7c664aef.jpg"><ins class="diff-new"> <legend>Bubbles traveled everywhere with us.</legend> </figure> </ins> </pre> In <del class="diff-old">both cases,</del> <ins class= "diff-chg">this case,</ins> though, it would be better if a detailed description of the important parts of the image <del class="diff-old">were included.</del> <ins class= "diff-chg">obtained from the user and included on the page.</ins> </div> <div class="example"> Sometimes there simply is no text that can do justice to an image. For example, there is little that can be said to usefully describe a Rorschach inkblot test. <pre> <figure> <img src="/commons/a/a7/Rorschach1.jpg"> <legend>A black outline of the first of the ten cards in the Rorschach inkblot test.</legend> </figure> </pre> Note that the following would be a very bad use of alternative text: <del class="diff-old"></del> <pre class="bad"> <!-- This example is wrong. Do not copy it. --> <figure> <img src="/commons/a/a7/Rorschach1.jpg" alt="A black outline of the first of the ten cards in the Rorschach inkblot test."> <legend>A black outline of the first of the ten cards in the Rorschach inkblot test.</legend> </figure> </pre> Including the caption in the alternative text like this isn't useful because it effectively duplicates the caption for users who don't have images, taunting them twice yet not helping them any more than if they had only read or heard the caption once. </div> Since some users cannot use images at all (e.g. because they have a very slow connection, or because they are using a text-only browser, or because they are listening to the page being read out by a hands-free automobile voice Web browser, or simply because they are blind), the <code title= "attr-img-alt"><a href="#alt">alt</a></code> attribute <del class= "diff-old">should</del> <ins class="diff-chg">is</ins> only <ins class="diff-new">allowed to</ins> be omitted when no alternative text is available and none can be made available, e.g. on automated image gallery sites. </dd> <dt>An image in an e-mail or document intended for a specific person who is known to be able to view images</dt> <dd> When an image is included in a communication (such as an HTML e-mail) aimed at someone who is known to be able to view images, the <code title="attr-img-alt"><a href="#alt">alt</a></code> attribute may be omitted. However, even in such cases it is <del class="diff-old">stongly</del> <ins class= "diff-chg">strongly</ins> recommended that alternative text be included (as appropriate according to the kind of image involved, as described in the above entries), so that the e-mail is still usable should the user use a mail client that does not support images, or should the e-mail be forwarded on to other users whose abilities might not include easily seeing images. </dd> </dl> The <code><a href="#img">img</a></code> must not be used as a layout tool. In particular, <code><a href="#img">img</a></code> elements should not be used to display fully transparent images, as they rarely convey meaning and rarely add anything useful to the document. There has been some suggestion that the <code title="">longdesc</code> attribute from HTML4, or some other mechanism that is more powerful than <code title="">alt=""</code> , should be included. This has not yet been considered. User agent requirements : When the <code title= "attr-img-alt"><a href="#alt">alt</a></code> attribute is present and its value is the empty string, the image supplements the surrounding content. In such cases, the image may be omitted without affecting the meaning of the document. When the <code title="attr-img-alt"><a href= "#alt">alt</a></code> attribute is present and its value is not the empty string, the image is a graphical equivalent of the string given in the <code title="attr-img-alt"><a href= "#alt">alt</a></code> attribute. In such cases, the image may be replaced in the rendering by the string given in the attribute without significantly affecting the meaning of the document. When the <code title="attr-img-alt"><a href= "#alt">alt</a></code> attribute is missing, the image represents a key part of the content. Non-visual user agents should apply image analysis heuristics to help the user make sense of the image. The <code title="attr-img-alt"><a href="#alt">alt</a></code> attribute does not represent advisory information. User agents must not present the contents of the <code title="attr-img-alt"><a href= "#alt">alt</a></code> attribute in the same way as content of the <code title="attr-title"><a href="#title">title</a></code> attribute. If the <code title="attr-img-src"><a href="#src">src</a></code> attribute is omitted, the image represents whatever string is given by the element's <code title="attr-img-alt"><a href= "#alt">alt</a></code> attribute, if any, or nothing, if that attribute is empty or absent. <del class="diff-old">When the</del> <ins class= "diff-chg">The</ins> <code title="attr-img-src"><a href= "#src">src</a></code> <del class="diff-old">attribute is set,</del> <ins class="diff-chg">attribute, on setting, must cause</ins> the user agent <del class="diff-old">must</del> <ins class= "diff-chg">to</ins> immediately begin to download the specified resource , unless the user agent cannot support images, or its support for images has been disabled. The download of the image must <a href="#delays">delay the <code title="event-load">load</code> event</a> . This, unfortunately, can be used to perform a rudimentary port scan of the user's local network (especially in conjunction with scripting, though scripting isn't actually necessary to carry out such an attack). User agents may implement <a href="#origin0" title="origin">cross-origin</a> access control policies that mitigate this attack. Once the download has completed, if the image is a valid image, the user agent must <a href="#firing4">fire a <code title= "event-load">load</code> event</a> on the <code><a href= "#img">img</a></code> <del class="diff-old">element.</del> <ins class="diff-chg">element (this happens after</ins> <code title="dom-img-complete"><a href="#complete"><ins class= "diff-chg">complete</ins></a></code> <ins class="diff-chg">starts returning true).</ins> If the download fails or it completes but the image is not a valid or supported image, the user agent must <a href="#firing5">fire an <code title="event-error">error</code> event</a> on the <code><a href="#img">img</a></code> element. The remote server's response metadata (e.g. an HTTP 404 status code, or <a href="#content-type8" title="Content-Type">associated Content-Type headers</a> ) must be ignored when determining whether the resource obtained is a valid image or not. This allows servers to return images with error responses. User agents must not support non-image resources with the <code><a href="#img">img</a></code> element. The <code title="attr-hyperlink-usemap"><a href= "#usemap1">usemap</a></code> attribute, if present, can indicate that the image has an associated <a href="#image">image map</a> . The <dfn id="ismap" title= "attr-img-ismap"><code>ismap</code></dfn> attribute, when used on an element that is a descendant of an <code><a href= "#a">a</a></code> element with an <code title= "attr-hyperlink-href"><a href="#href6">href</a></code> attribute, indicates by its presence that the element provides access to a server-side image map. This affects how events are handled on the corresponding <code><a href="#a">a</a></code> element. The <code title="attr-img-ismap"><a href= "#ismap">ismap</a></code> attribute is a <a href= "#boolean0">boolean attribute</a> . The attribute must not be specified on an element that does not have an ancestor <code><a href="#a">a</a></code> element with an <code title= "attr-hyperlink-href"><a href="#href6">href</a></code> attribute. The <code><a href="#img">img</a></code> element supports <a href="#dimension0">dimension attributes</a> . The DOM attributes <dfn id="alt0" title= "dom-img-alt"><code>alt</code></dfn> , <dfn id="src0" title= "dom-img-src"><code>src</code></dfn> , <dfn id="usemap" title= "dom-img-useMap"><code>useMap</code></dfn> , and <dfn id="ismap0" title="dom-img-isMap"><code>isMap</code></dfn> each must <a href= "#reflect">reflect</a> the respective content attributes of the same name. The DOM attributes <dfn id="height" title= "dom-img-height"><code>height</code></dfn> and <dfn id="width" title="dom-img-width"><code>width</code></dfn> must return the rendered height and width of the image, in CSS pixels, if the image is being rendered, and is being rendered to a visual medium, or 0 otherwise. <a href="#references">[CSS21]</a> The DOM attribute <dfn id="complete" title= "dom-img-complete"><code>complete</code></dfn> must return true if the user agent has downloaded the image specified in the <code title="attr-img-src"><a href="#src">src</a></code> attribute, and it is a valid image, and false otherwise. <ins class="diff-new">The value of</ins> <code title="dom-img-complete"><a href="#complete"><ins class= "diff-new">complete</ins></a></code> <ins class="diff-new">can change while a script is executing.</ins> <div class="example"> <ins class="diff-new">A single image can have different appropriate alternative text depending on the context.</ins> <ins class="diff-new">In each of the following cases, the same image is used, yet the</ins> <code title="attr-img-alt"><a href= "#alt"><ins class="diff-new">alt</ins></a></code> <ins class= "diff-new">text is different each time. The image is the coat of arms of the Canton Geneva in Switzerland.</ins> <ins class="diff-new">Here it is used as a supplementary icon:</ins> <pre> <ins class="diff-new"> <p> I lived in <img src="carouge.svg" alt=""> Carouge. </ins> </pre> <ins class="diff-new">Here it is used as an icon representing the town:</ins> <pre> <ins class="diff-new"> <p> Home town: <img src="carouge.svg" alt="Carouge"> </p> </ins> </pre> <ins class="diff-new">Here it is used as part of a text on the town:</ins> <pre> <p>Carouge has a coat of arms.<ins class= "diff-new"> <p><img src="carouge.svg" alt="The coat of arms depicts a lion, sitting in front of a tree."></p> <p> It is used as decoration all over the town. </ins> </pre> <ins class="diff-new">Here it is used as a way to support a similar text where the description is given as well as, instead of as an alternative to, the image:</ins> <pre> <p>Carouge has a coat of arms.<ins class= "diff-new"> <p><img src="carouge.svg" alt=""></p> <p>The coat of arms depicts a lion, sitting in front of a tree. It is used as decoration all over the town. </ins> </pre> <ins class="diff-new">Here it is used as part of a story:</ins> <pre> <p>He picked up the folder and a piece of paper fell out.<ins class="diff-new"> <p><img src="carouge.svg" alt="Shaped like a shield, the paper had a red background, a green tree, and a yellow lion with its tongue hanging out and whose tail was shaped like an S."></p> <p>He stared at the folder. S! The answer he had been looking for all this time was simply the letter S! How had he not seen that before? It all came together now. The phone call where Hector had referred to a lion's tail, the time Marco had stuck his tongue out... </ins> </pre></div> <div class="example"> <ins class="diff-new">Here are some more examples showing the same picture used in different contexts, with different appropriate alternate texts each time.</ins> <pre> <article><ins class="diff-new"> <h1>My cats</h1> <h2>Fluffy</h2> <p>Fluffy is my favourite. <img src="fluffy.jpg" alt="She likes playing with a ball of yarn."> <p>She's just too cute. <h2>Miles</h2> <p>My other cat, Miles just eats and sleeps. </article> </ins> </pre> <pre> <article><ins class="diff-new"> <h1>Photography</h1> <h2>Shooting moving targets indoors</h2> <p>The trick here is to know how to anticipate; to know at what speed and what distance the subject will pass by. <img src="fluffy.jpg" alt="A cat flying by, chasing a ball of yarn, can be photographed quite nicely using this technique."> <h2>Nature by night</h2> <p>To achieve this, you'll need either an extremely sensitive film, or immense flash lights. </article> </ins> </pre> <pre> <article><ins class="diff-new"> <h1>About me</h1> <h2>My pets</h2> <p>I've got a cat named Fluffy and a dog named Miles. <img src="fluffy.jpg" alt="Fluffy, my cat, tends to keep itself busy."> <p>My dog Miles and I like go on long walks together. <h2>music</h2> <p>After our walks, having emptied my mind, I like listening to Bach. </article> </ins> </pre> <pre> <article><ins class="diff-new"> <h1>Fluffy and the Yarn</h1> <p>Fluffy was a cat who liked to play with yarn. He also liked to jump. <aside><img src="fluffy.jpg" alt="" title="Fluffy"></aside> <p>He would play in the morning, he would play in the evening. </article> </ins> </pre></div> <h4 id="the-iframe"><del class= "diff-old">3.14.3.</del> <ins class="diff-chg">3.12.3</ins> The <dfn id="iframe"><code>iframe</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#embedded1">Embedded content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#embedded1">embedded content</a> is expected.</dd> <dt>Content model:</dt> <dd>Text that conforms to the requirements given in the prose.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-iframe-src"><a href= "#src1">src</a></code></dd> <dd><code title="attr-iframe-name"><a href="#name1"><ins class= "diff-new">name</ins></a></code></dd> <dd><code title="attr-iframe-sandbox"><a href= "#sandbox"><ins class="diff-new">sandbox</ins></a></code></dd> <dd><code title="attr-iframe-seamless"><a href= "#seamless"><ins class="diff-new">seamless</ins></a></code></dd> <dd><code title="attr-dim-width"><a href="#width4"><ins class= "diff-new">width</ins></a></code></dd> <dd><code title="attr-dim-height"><a href="#height3"><ins class= "diff-new">height</ins></a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmliframeelement">HTMLIFrameElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute DOMString <a href="#src2" title= "dom-iframe-src">src</a>; <ins class="diff-new"> attribute DOMString <a href= "#name2" title="dom-iframe-name">name</a>; attribute DOMString <a href="#sandbox0" title= "dom-iframe-sandbox">sandbox</a>; attribute boolean <a href="#seamless1" title= "dom-iframe-seamless">seamless</a>; attribute long <a href="#width5" title= "dom-dim-width">width</a>; attribute long <a href="#height4" title= "dom-dim-height">height</a>; </ins> }; </pre> Objects implementing the <code><a href= "#htmliframeelement">HTMLIFrameElement</a></code> interface must also implement the <code>EmbeddingElement</code> interface defined in the Window Object specification. <a href= "#references">[WINDOW]</a> </dd> </dl> The <code><a href="#iframe">iframe</a></code> element introduces a new nested <a href="#browsing1">browsing context</a> . The <dfn id="src1" title= "attr-iframe-src"><code>src</code></dfn> attribute, if present, must be a URI (or IRI) to a page that the nested <a href= "#browsing1">browsing context</a> is to contain. When the browsing context is created, if the attribute is present, the user agent must <a href="#navigate">navigate</a> this browsing context to the given URI, with <a href="#replacement">replacement enabled</a> , <ins class="diff-new">and with the</ins> <code><a href= "#iframe"><ins class="diff-new">iframe</ins></a></code> <ins class= "diff-new">element's document's</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">as the</ins> <a href="#source0"><ins class= "diff-new">source browsing context</ins></a> . If the user <a href= "#navigate" title="navigate">navigates</a> away from this page, the <code><a href="#iframe">iframe</a></code> 's corresponding <code><a href="#window">Window</a></code> object will reference new <code>Document</code> objects, but the <code title= "attr-iframe-src"><a href="#src1">src</a></code> attribute will not change. Whenever the <code title="attr-iframe-src"><a href= "#src1">src</a></code> attribute is set, the nested <a href= "#browsing1">browsing context</a> must be <a href="#navigate" title="navigate">navigated</a> to the given <del class= "diff-old">URI.</del> <ins class="diff-chg">URI, with the</ins> <code><a href="#iframe"><ins class= "diff-chg">iframe</ins></a></code> <ins class="diff-chg">element's document's</ins> <a href="#browsing1"><ins class= "diff-chg">browsing context</ins></a> <ins class="diff-chg">as the</ins> <a href="#source0"><ins class="diff-chg">source browsing context</ins></a> . If the <code title="attr-iframe-src"><a href= "#src1">src</a></code> attribute is not set when the element is created, the browsing context will remain at the initial <code>about:blank</code> page. <ins class="diff-new">The</ins> <dfn id="name1" title= "attr-iframe-name"><code><ins class= "diff-new">name</ins></code></dfn> <ins class="diff-new">attribute, if present, must be a</ins> <a href="#valid8"><ins class= "diff-new">valid browsing context name</ins></a> .<ins class= "diff-new">When the browsing context is created, if the attribute is present, the</ins> <a href="#browsing2"><ins class= "diff-new">browsing context name</ins></a> <ins class= "diff-new">must be set to the value of this attribute; otherwise, the</ins> <a href="#browsing2"><ins class="diff-new">browsing context name</ins></a> <ins class="diff-new">must be set to the empty string.</ins> <ins class="diff-new">Whenever the</ins> <code title= "attr-iframe-name"><a href="#name1"><ins class= "diff-new">name</ins></a></code> <ins class="diff-new">attribute is set, the nested</ins> <a href="#browsing1"><ins class= "diff-new">browsing context</ins></a> <ins class= "diff-new">'s</ins> <a href="#browsing2" title= "browsing context name"><ins class="diff-new">name</ins></a> <ins class="diff-new">must be changed to the new value. If the attribute is removed, the</ins> <a href="#browsing2"><ins class= "diff-new">browsing context name</ins></a> <ins class= "diff-new">must be set to the empty string.</ins> When content loads in an <code><a href= "#iframe">iframe</a></code> , after any <code title= "event-load"><a href="#load0">load</a></code> events are fired within the content itself, the user agent must <a href= "#firing4">fire a <code title="event-load">load</code> event</a> at the <code><a href="#iframe">iframe</a></code> element. When content fails to load (e.g. due to a network error), then the user agent must <a href="#firing5">fire an <code title= "event-error">error</code> event</a> at the element instead. When there is an active parser in the <code><a href= "#iframe">iframe</a></code> , and when anything in the <code><a href="#iframe">iframe</a></code> that is <a href="#delays" title="delay the load event">delaying the <code title= "event-load">load</code> event</a> in the <code><a href= "#iframe">iframe</a></code> 's <a href="#browsing1">browsing context</a> , the <code><a href="#iframe">iframe</a></code> must <a href="#delays">delay the <code title="event-load">load</code> event</a> . If, during the handling of the <code title= "event-load"><a href="#load0">load</a></code> event, the <a href= "#browsing1">browsing context</a> in the <code><a href= "#iframe">iframe</a></code> is again <a href="#navigate" title= "navigate">navigated</a> , that will further <a href= "#delays">delay the <code title="event-load">load</code> event</a> . <hr> <ins class="diff-new">The</ins> <dfn id="sandbox" title= "attr-iframe-sandbox"><code><ins class= "diff-new">sandbox</ins></code></dfn> <ins class= "diff-new">attribute, when specified, enables a set of extra restrictions on any content hosted by the</ins> <code><a href= "#iframe"><ins class="diff-new">iframe</ins></a></code> .<ins class="diff-new">Its value must be an</ins> <a href= "#unordered"><ins class="diff-new">unordered set of unique space-separated tokens</ins></a> .<ins class="diff-new">The allowed values are</ins> <code title= "attr-iframe-sandbox-allow-same-origin"><a href= "#allow-same-origin"><ins class= "diff-new">allow-same-origin</ins></a></code> ,<code title= "attr-iframe-sandbox-allow-forms"><a href= "#allow-forms"><ins class="diff-new">allow-forms</ins></a></code> ,<ins class="diff-new">and</ins> <code title= "attr-iframe-sandbox-allow-scripts"><a href= "#allow-scripts"><ins class= "diff-new">allow-scripts</ins></a></code> . <ins class="diff-new">While the</ins> <code title= "attr-iframe-sandbox"><a href="#sandbox"><ins class= "diff-new">sandbox</ins></a></code> <ins class="diff-new">attribute is specified, the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class= "diff-new">element's</ins> <a href="#nested0"><ins class= "diff-new">nested browsing context</ins></a> ,<ins class= "diff-new">and all the browsing contexts</ins> <a href="#nested0" title="nested browsing context"><ins class= "diff-new">nested</ins></a> <ins class="diff-new">within it (either directly or indirectly through other nested browsing contexts) must have the following flags set:</ins> <dl> <dt><ins class="diff-new">The</ins> <dfn id="sandboxed"><ins class= "diff-new">sandboxed navigation browsing context flag</ins></dfn></dt> <dd> <ins class="diff-new">This flag</ins> <a href= "#sandboxLinks"><ins class="diff-new">prevents content from navigating browsing contexts other than the sandboxed browsing context itself</ins></a> <ins class="diff-new">(or browsing contexts further nested inside it).</ins> <ins class="diff-new">This flag also</ins> <a href= "#sandboxWindowOpen"><ins class="diff-new">prevents content from creating new auxiliary browsing contexts</ins></a> ,<ins class= "diff-new">e.g. using the</ins> <code title= "attr-hyperlink-target"><a href="#target3"><ins class= "diff-new">target</ins></a></code> <ins class="diff-new">attribute or the</ins> <code title="dom-open"><a href="#open2"><ins class= "diff-new">window.open()</ins></a></code> <ins class= "diff-new">method.</ins> </dd> <dt><ins class="diff-new">The</ins> <dfn id= "sandboxed0"><ins class="diff-new">sandboxed plugins browsing context flag</ins></dfn></dt> <dd> <ins class="diff-new">This flag prevents content from instantiating</ins> <a href="#plugin" title="plugin"><ins class= "diff-new">plugins</ins></a> ,<ins class="diff-new">whether using</ins> <a href="#sandboxPluginEmbed"><ins class= "diff-new">the</ins> <code><ins class="diff-new">embed</ins></code> <ins class="diff-new">element</ins></a> ,<a href= "#sandboxPluginObject"><ins class="diff-new">the</ins> <code><ins class="diff-new">object</ins></code> <ins class= "diff-new">element</ins></a> ,<a href= "#sandboxPluginApplet"><ins class="diff-new">the</ins> <code><ins class="diff-new">applet</ins></code> <ins class= "diff-new">element</ins></a> ,<ins class="diff-new">or through</ins> <a href="#sandboxPluginNavigate"><ins class= "diff-new">navigation</ins></a> <ins class="diff-new">of a</ins> <a href="#nested0"><ins class="diff-new">nested browsing context</ins></a> . </dd> <dt><ins class="diff-new">The</ins> <dfn id= "sandboxed1"><ins class="diff-new">sandboxed annoyances browsing context flag</ins></dfn></dt> <dd> <ins class="diff-new">This flag prevents content from</ins> <a href="#sandboxNotifications"><ins class="diff-new">showing notifications</ins></a> <ins class="diff-new">outside of the</ins> <a href="#nested0"><ins class="diff-new">nested browsing context</ins></a> . </dd> <dt><ins class="diff-new">The</ins> <dfn id= "sandboxed2"><ins class="diff-new">sandboxed origin browsing context flag</ins></dfn> ,<ins class="diff-new">unless the</ins> <code title="attr-iframe-sandbox"><a href="#sandbox"><ins class= "diff-new">sandbox</ins></a></code> <ins class= "diff-new">attribute's value, when</ins> <a href="#split" title= "split a string on spaces"><ins class="diff-new">split on spaces</ins></a> ,<ins class="diff-new">is found to have the</ins> <dfn id="allow-same-origin" title= "attr-iframe-sandbox-allow-same-origin"><code><ins class= "diff-new">allow-same-origin</ins></code></dfn> <ins class= "diff-new">keyword set</ins></dt> <dd> <ins class="diff-new">This flag</ins> <a href= "#sandboxOrigin"><ins class="diff-new">forces content into a unique origin</ins></a> <ins class="diff-new">for the purposes of the</ins> <a href="#origin0" title="origin"><ins class= "diff-new">same-origin policy</ins></a> . <ins class="diff-new">This flag also</ins> <a href= "#sandboxCookies"><ins class="diff-new">prevents script from reading the</ins> <code title="dom-document-cookies"><ins class= "diff-new">document.cookies</ins></code> <ins class="diff-new">DOM attribute</ins></a> . <div class="note"> <ins class="diff-new">The</ins> <code title= "attr-iframe-sandbox-allow-same-origin"><a href= "#allow-same-origin"><ins class= "diff-new">allow-same-origin</ins></a></code> <ins class= "diff-new">attribute is intended for two cases.</ins> <ins class="diff-new">First, it can be used to allow content from the same site to be sandboxed to disable scripting, while still allowing access to the DOM of the sandboxed content.</ins> <ins class="diff-new">Second, it can be used to embed content from a third-party site, sandboxed to prevent that site from opening popup windows, etc, without preventing the embedded page from communicating back to its originating site, using the database APIs to store data, etc.</ins> </div> </dd> <dt><ins class="diff-new">The</ins> <dfn id= "sandboxed3"><ins class="diff-new">sandboxed forms browsing context flag</ins></dfn> ,<ins class="diff-new">unless the</ins> <code title="attr-iframe-sandbox"><a href="#sandbox"><ins class= "diff-new">sandbox</ins></a></code> <ins class= "diff-new">attribute's value, when</ins> <a href="#split" title= "split a string on spaces"><ins class="diff-new">split on spaces</ins></a> ,<ins class="diff-new">is found to have the</ins> <dfn id="allow-forms" title= "attr-iframe-sandbox-allow-forms"><code><ins class= "diff-new">allow-forms</ins></code></dfn> <ins class= "diff-new">keyword set</ins></dt> <dd> <ins class="diff-new">This flag</ins> <a href= "#sandboxSubmitBlocked"><ins class="diff-new">blocks form submission</ins></a> . </dd> <dt><ins class="diff-new">The</ins> <dfn id= "sandboxed4"><ins class="diff-new">sandboxed scripts browsing context flag</ins></dfn> ,<ins class="diff-new">unless the</ins> <code title="attr-iframe-sandbox"><a href="#sandbox"><ins class= "diff-new">sandbox</ins></a></code> <ins class= "diff-new">attribute's value, when</ins> <a href="#split" title= "split a string on spaces"><ins class="diff-new">split on spaces</ins></a> ,<ins class="diff-new">is found to have the</ins> <dfn id="allow-scripts" title= "attr-iframe-sandbox-allow-scripts"><code><ins class= "diff-new">allow-scripts</ins></code></dfn> <ins class= "diff-new">keyword set</ins></dt> <dd> <ins class="diff-new">This flag</ins> <a href= "#sandboxScriptBlocked"><ins class="diff-new">blocks script execution</ins></a> . </dd> </dl> <ins class="diff-new">These flags must not be set unless the conditions listed above define them as being set.</ins> <div class="example"> <ins class="diff-new">In this example, some completely-unknown, potentially hostile, user-provided HTML content is embedded in a page. Because it is sandboxed, it is treated by the user agent as being from a unique origin, despite the content being served from the same site. Thus it is affected by all the normal cross-site restrictions. In addition, the embedded page has scripting disabled, plugins disabled, forms disabled, and it cannot navigate any frames or windows other than itself (or any frames or windows it itself embeds).</ins> <pre> <p>We're not scared of you! Here is your content, unedited:</p><ins class="diff-new"> <iframe sandbox src="getusercontent.cgi?id=12193"> </iframe> </ins> </pre> <ins class="diff-new">Note that cookies are still send to the server in the</ins> <code title=""><ins class= "diff-new">getusercontent.cgi</ins></code> <ins class= "diff-new">request, though they are not visible in the</ins> <code title="dom-document-cookies"><ins class= "diff-new">document.cookies</ins></code> <ins class="diff-new">DOM attribute.</ins> </div> <div class="example"> <ins class="diff-new">In this example, a gadget from another site is embedded. The gadget has scripting and forms enabled, and the origin sandbox restrictions are lifted, allowing the gadget to communicate with its originating server. The sandbox is still useful, however, as it disables plugins and popups, thus reducing the risk of the user being exposed to malware and other annoyances.</ins> <pre> <iframe sandbox="allow-same-origin allow-forms allow-scripts"<ins class="diff-new"> src="http://maps.example.com/embedded.html"> </iframe> </ins> </pre></div> <hr> <ins class="diff-new">The</ins> <dfn id="seamless" title= "attr-iframe-seamless"><code><ins class= "diff-new">seamless</ins></code></dfn> <ins class= "diff-new">attribute is a boolean attribute. When specified, it indicates that the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class= "diff-new">element's</ins> <a href="#browsing1"><ins class= "diff-new">browsing context</ins></a> <ins class="diff-new">is to be rendered in a manner that makes it appear to be part of the containing document (seamlessly included in the parent document). Specifically, when the attribute is set on an element and while the</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">'s</ins> <a href= "#active"><ins class="diff-new">active document</ins></a> <ins class="diff-new">has the</ins> <a href= "#same-origin"><ins class="diff-new">same origin</ins></a> <ins class="diff-new">as the</ins> <code><a href= "#iframe"><ins class="diff-new">iframe</ins></a></code> <ins class= "diff-new">element's document, or the</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">'s</ins> <a href="#active"><ins class= "diff-new">active document</ins></a> <ins class="diff-new">'s</ins> <ins class="diff-new">URI</ins> <ins class="diff-new">has the</ins> <a href="#same-origin"><ins class="diff-new">same origin</ins></a> <ins class="diff-new">as the</ins> <code><a href= "#iframe"><ins class="diff-new">iframe</ins></a></code> <ins class= "diff-new">element's document, the following requirements apply:</ins> <ul> <li> <ins class="diff-new">The user agent must set the</ins> <dfn id= "seamless0"><ins class="diff-new">seamless browsing context flag</ins></dfn> <ins class="diff-new">to true for that</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> .<ins class="diff-new">This will</ins> <a href= "#seamlessLinks"><ins class="diff-new">cause links to open in the parent browsing context</ins></a> . </li> <li> <ins class="diff-new">In a CSS-supporting user agent: the user agent must add all the style sheets that apply to the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class="diff-new">element to the cascade of the</ins> <a href="#active"><ins class= "diff-new">active document</ins></a> <ins class="diff-new">of the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class= "diff-new">element's</ins> <a href="#nested0"><ins class= "diff-new">nested browsing context</ins></a> ,<ins class= "diff-new">at the appropriate cascade levels, before any style sheets specified by the document itself.</ins> </li> <li> <ins class="diff-new">In a CSS-supporting user agent: the user agent must, for the purpose of CSS property inheritance only, treat the root element of the</ins> <a href="#active"><ins class= "diff-new">active document</ins></a> <ins class="diff-new">of the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class= "diff-new">element's</ins> <a href="#nested0"><ins class= "diff-new">nested browsing context</ins></a> <ins class= "diff-new">as being a child of the</ins> <code><a href= "#iframe"><ins class="diff-new">iframe</ins></a></code> <ins class= "diff-new">element. (Thus inherited properties on the root element of the document in the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class="diff-new">will inherit the computed values of those properties on the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class="diff-new">element instead of taking their initial values.)</ins> </li> <li> <ins class="diff-new">In visual media, in a CSS-supporting user agent: the user agent should set the intrinsic width of the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class="diff-new">to the width that the element would have if it was a non-replaced block-level element with 'width: auto'.</ins> </li> <li> <ins class="diff-new">In visual media, in a CSS-supporting user agent: the user agent should set the intrinsic height of the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class="diff-new">to the height of the bounding box around the content rendered in the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class="diff-new">at its current width.</ins> </li> <li> <ins class="diff-new">In visual media, in a CSS-supporting user agent: the user agent must force the height of the initial containing block of the</ins> <a href="#active"><ins class= "diff-new">active document</ins></a> <ins class="diff-new">of the</ins> <a href="#nested0"><ins class="diff-new">nested browsing context</ins></a> <ins class="diff-new">of the</ins> <code><a href= "#iframe"><ins class="diff-new">iframe</ins></a></code> <ins class= "diff-new">to zero.</ins> <ins class="diff-new">This is intended to get around the otherwise circular dependency of percentage dimensions that depend on the height of the containing block, thus affecting the height of the document's bounding box, thus affecting the height of the viewport, thus affecting the size of the initial containing block.</ins> </li> <li> <ins class="diff-new">In speech media, the user agent should render the</ins> <a href="#nested0"><ins class="diff-new">nested browsing context</ins></a> <ins class="diff-new">without announcing that it is a separate document.</ins> </li> <li> <ins class="diff-new">User agents should, in general, act as if the</ins> <a href="#active"><ins class="diff-new">active document</ins></a> <ins class="diff-new">of the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class="diff-new">'s</ins> <a href="#nested0"><ins class="diff-new">nested browsing context</ins></a> <ins class="diff-new">was part of the document that the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class="diff-new">is in.</ins> <ins class="diff-new">For example if the user agent supports listing all the links in a document, links in "seamlessly" nested documents would be included in that list without being significantly distinguished from links in the document itself.</ins> </li> </ul> <ins class="diff-new">Parts of the above might get moved into the rendering section at some point.</ins> <ins class="diff-new">If the attribute is not specified, or if the</ins> <a href="#origin0"><ins class="diff-new">origin</ins></a> <ins class="diff-new">conditions listed above are not met, then the user agent should render the</ins> <a href="#nested0"><ins class= "diff-new">nested browsing context</ins></a> <ins class= "diff-new">in a manner that is clearly distinguishable as a separate</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> ,<ins class="diff-new">and the</ins> <a href= "#seamless0"><ins class="diff-new">seamless browsing context flag</ins></a> <ins class="diff-new">must be set to false for that</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> . <ins class="diff-new">It is important that user agents recheck the above conditions whenever the</ins> <a href= "#active"><ins class="diff-new">active document</ins></a> <ins class="diff-new">of the</ins> <a href="#nested0"><ins class= "diff-new">nested browsing context</ins></a> <ins class= "diff-new">of the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class="diff-new">changes, such that the</ins> <a href="#seamless0"><ins class= "diff-new">seamless browsing context flag</ins></a> <ins class= "diff-new">gets unset if the</ins> <a href="#nested0"><ins class= "diff-new">nested browsing context</ins></a> <ins class= "diff-new">is</ins> <a href="#navigate" title= "navigate"><ins class="diff-new">navigated</ins></a> <ins class= "diff-new">to another origin.</ins> <div class="example"> <ins class="diff-new">In this example, the site's navigation is embedded using a client-side include using an</ins> <code><a href= "#iframe"><ins class="diff-new">iframe</ins></a></code> .<ins class="diff-new">Any links in the</ins> <code><a href= "#iframe"><ins class="diff-new">iframe</ins></a></code> <ins class= "diff-new">will, in new user agents, be automatically opened in the</ins> <code><a href="#iframe"><ins class= "diff-new">iframe</ins></a></code> <ins class="diff-new">'s parent browsing context; for legacy user agents, the site could also include a</ins> <code><a href="#base"><ins class= "diff-new">base</ins></a></code> <ins class="diff-new">element with a</ins> <code title="attr-base-target"><a href= "#target"><ins class="diff-new">target</ins></a></code> <ins class= "diff-new">attribute with the value</ins> <code title= ""><ins class="diff-new">_parent</ins></code> .<ins class= "diff-new">Similarly, in new user agents the styles of the parent page will be automatically applied to the contents of the frame, but to support legacy user agents authors might wish to include the styles explicitly.</ins> <pre> <ins class="diff-new"> <nav> <iframe seamless src="nav.include.html"> </iframe> </nav> </ins> </pre></div> <hr> <ins class="diff-new">The</ins> <code><a href= "#iframe"><ins class="diff-new">iframe</ins></a></code> <ins class= "diff-new">element supports</ins> <a href="#dimension0"><ins class= "diff-new">dimension attributes</ins></a> <ins class="diff-new">for cases where the embedded content has specific dimensions (e.g. ad units have well-defined dimensions).</ins> An <code><a href="#iframe">iframe</a></code> element never has <a href="#fallback">fallback content</a> , as it will always create a nested <a href="#browsing1">browsing context</a> , regardless of whether the specified initial contents are successfully used. Descendants of <code><a href="#iframe">iframe</a></code> elements represent nothing. (In legacy user agents that do not support <code><a href="#iframe">iframe</a></code> elements, the contents would be parsed as markup that could act as fallback content.) The content model of <code><a href="#iframe">iframe</a></code> elements is text, except that the text must be such that <del class="diff-old">...</del> ... anyone have any bright ideas? The <a href="#html-0">HTML parser</a> treats markup inside <code><a href="#iframe">iframe</a></code> elements as text. The DOM <del class="diff-old">attribute</del> <ins class= "diff-chg">attributes</ins> <dfn id="src2" title= "dom-iframe-src"><code>src</code></dfn> , <dfn id="name2" title= "dom-iframe-name"><code><ins class= "diff-new">name</ins></code></dfn> ,<dfn id="sandbox0" title= "dom-iframe-sandbox"><code><ins class= "diff-new">sandbox</ins></code></dfn> ,<ins class= "diff-new">and</ins> <dfn id="seamless1" title= "dom-iframe-seamless"><code><ins class= "diff-new">seamless</ins></code></dfn> must <a href= "#reflect">reflect</a> the content <del class= "diff-old">attribute</del> <ins class="diff-chg">attributes</ins> of the same name. <h4 id="the-embed"><del class= "diff-old">3.14.4.</del> <ins class="diff-chg">3.12.4</ins> The <dfn id="embed"><code>embed</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#embedded1">Embedded content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#embedded1">embedded content</a> is expected.</dd> <dt>Content model:</dt> <dd>Empty.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-embed-src"><a href= "#src3">src</a></code></dd> <dd><code title="attr-embed-type"><a href= "#type4">type</a></code></dd> <dd><code title="attr-dim-width"><a href= "#width4">width</a></code></dd> <dd><code title="attr-dim-height"><a href= "#height3">height</a></code></dd> <dd>Any other attribute that has no namespace (see prose).</dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlembedelement">HTMLEmbedElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute DOMString <a href="#src4" title= "dom-embed-src">src</a>; attribute DOMString <a href="#type5" title= "dom-embed-type">type</a>; <del class="diff-old"> attribute long ; </del> <ins class="diff-chg"> attribute long <a href="#width5" title="dom-dim-width">width</a>; </ins> attribute long <a href="#height4" title= "dom-dim-height">height</a>; }; </pre> Depending on the type of content instantiated by the <code><a href="#embed">embed</a></code> element, the node may also support other interfaces. </dd> </dl> The <code><a href="#embed">embed</a></code> element represents an integration point for an external (typically non-HTML) application or interactive content. The <dfn id="src3" title="attr-embed-src"><code>src</code></dfn> attribute gives the address of the resource being embedded. The attribute must be present and contain a URI (or IRI). If the <code title="attr-embed-src"><a href= "#src3">src</a></code> attribute is missing, then the <code><a href="#embed">embed</a></code> element must be <del class= "diff-old">ignored.</del> <ins class="diff-chg">ignored (it represents nothing).</ins> <ins class="diff-chg">If the</ins> <a href="#sandboxed0"><ins class="diff-chg">sandboxed plugins browsing context flag</ins></a> <ins class="diff-chg">is set on the</ins> <a href="#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">for which the</ins> <code><a href="#embed"><ins class="diff-chg">embed</ins></a></code> <ins class="diff-chg">element's document is the</ins> <a href= "#active"><ins class="diff-chg">active document</ins></a> ,<ins class="diff-chg">then the user agent must render the</ins> <code><a href="#embed"><ins class="diff-chg">embed</ins></a></code> <ins class="diff-chg">element in a manner that conveys that the</ins> <a href="#plugin"><ins class="diff-chg">plugin</ins></a> <ins class="diff-chg">was disabled. The user agent may offer the user the option to override the sandbox and instantiate the</ins> <a href="#plugin"><ins class="diff-chg">plugin</ins></a> <ins class="diff-chg">anyway; if the user invokes such an option, the user agent must act as if the</ins> <a href= "#sandboxed0"><ins class="diff-chg">sandboxed plugins browsing context flag</ins></a> <ins class="diff-chg">was not set for the purposes of this element.</ins> <ins class="diff-chg">Plugins are disabled in sandboxed browsing contexts because they might not honor the restrictions imposed by the sandbox (e.g. they might allow scripting even when scripting in the sandbox is disabled). User agents should convey the danger of overriding the sandbox to the user if an option to do so is provided.</ins> <ins class="diff-chg">Otherwise, the</ins> <code title= "attr-embed-src"><a href="#src3"><ins class= "diff-chg">src</ins></a></code> <ins class="diff-chg">attribute is present, and the element is not in a sandboxed browsing context:</ins> When the <code title="attr-embed-src"><a href= "#src3">src</a></code> attribute is set, user agents are expected to find an appropriate <del class="diff-old">handler</del> <a href= "#plugin"><ins class="diff-chg">plugin</ins></a> for the specified resource, based on the <a href="#type-of" title= "concept-embed-type">content's type</a> , and hand that <del class= "diff-old">handler</del> <a href="#plugin"><ins class= "diff-chg">plugin</ins></a> the content of the resource. If the <del class="diff-old">handler</del> <a href="#plugin"><ins class= "diff-chg">plugin</ins></a> supports a scriptable interface, the <code><a href="#htmlembedelement">HTMLEmbedElement</a></code> object representing the element should expose that interfaces. The download of the resource must <a href="#delays">delay the <code title="event-load">load</code> event</a> . The user agent should pass the names and values of all the attributes of the <code><a href="#embed">embed</a></code> element that have no namespace to the <del class="diff-old">handler</del> <a href="#plugin"><ins class="diff-chg">plugin</ins></a> used. Any (namespace-less) attribute may be specified on the <code><a href= "#embed">embed</a></code> element. <del class="diff-old">This specification does not define a mechanism for interacting with third-party handlers, as it is expected to be user-agent-specific. Some UAs might opt to support a plugin mechanism such as the Netscape Plugin API; others may use remote content convertors or have built-in support for certain types. [NPAPI]</del> The <code><a href="#embed">embed</a></code> element has no <a href="#fallback">fallback content</a> . If the user agent can't display the specified resource, e.g. because the given type is not supported, then the user agent must use a default <del class= "diff-old">handler</del> <ins class="diff-chg">plugin</ins> for the content. (This default could be as simple as saying "Unsupported Format", of course.) The <dfn id="type4" title= "attr-embed-type"><code>type</code></dfn> attribute, if present, gives the MIME type of the linked resource. The value must be a valid MIME type, optionally with parameters. <a href= "#references">[RFC2046]</a> The <dfn id="type-of" title="concept-embed-type">type of the content</dfn> being embedded is defined as follows: <ol> <li>If the element has a <code title="attr-embed-type"><a href= "#type4">type</a></code> attribute, then the value of the <code title="attr-embed-type"><a href="#type4">type</a></code> attribute is the content's type .</li> <li>Otherwise, if the specified resource has <a href= "#content-type8" title="Content-Type">explicit Content-Type metadata</a> , then that is the content's type .</li> <li>Otherwise, the content has no type and there can be no appropriate <del class="diff-old">handler</del> <a href= "#plugin"><ins class="diff-chg">plugin</ins></a> for it.</li> </ol> Should we instead say that the content-sniffing <del class="diff-old">that we're going to define</del> <ins class="diff-chg">used</ins> for top-level browsing contexts should apply here? Should we require the type attribute to match the server information? We should say that 404s, etc, don't affect whether the resource is used or not. Not sure how to say it here though. <del class="diff-old">Browsers should take extreme care when interacting with external content intended for third-party renderers. When third-party software is run with the same privileges as the user agent itself, vulnerabilities in the third-party software become as dangerous as those in the user agent.</del> The <code><a href="#embed">embed</a></code> element supports <a href="#dimension0">dimension attributes</a> . The DOM attributes <dfn id="src4" title= "dom-embed-src"><code>src</code></dfn> and <dfn id="type5" title= "dom-embed-type"><code>type</code></dfn> each must <a href= "#reflect">reflect</a> the respective content attributes of the same name. <h4 id="the-object"><del class= "diff-old">3.14.5.</del> <ins class="diff-chg">3.12.5</ins> The <dfn id="object"><code>object</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#embedded1">Embedded content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#embedded1">embedded content</a> is expected.</dd> <dt>Content model:</dt> <dd>Zero or more <code><a href="#param">param</a></code> elements, then, <a href="#transparent0">transparent</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-object-data"><a href= "#data">data</a></code></dd> <dd><code title="attr-object-type"><a href= "#type6">type</a></code></dd> <dd><code title="attr-object-name"><a href="#name3"><ins class= "diff-new">name</ins></a></code></dd> <dd><code title="attr-hyperlink-usemap"><a href= "#usemap1">usemap</a></code></dd> <dd><code title="attr-dim-width"><a href= "#width4">width</a></code></dd> <dd><code title="attr-dim-height"><a href= "#height3">height</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlobjectelement">HTMLObjectElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute DOMString <a href="#data0" title= "dom-object-data">data</a>; attribute DOMString <a href="#type7" title= "dom-object-type">type</a>; <ins class="diff-new"> attribute DOMString <a href= "#name4" title="dom-object-name">name</a>; </ins> attribute DOMString <a href="#usemap0" title= "dom-object-useMap">useMap</a>; <del class="diff-old"> attribute long ; </del> <ins class="diff-chg"> attribute long <a href="#width5" title="dom-dim-width">width</a>; </ins> attribute long <a href="#height4" title= "dom-dim-height">height</a>; }; </pre> Objects implementing the <code><a href= "#htmlobjectelement">HTMLObjectElement</a></code> interface must also implement the <code>EmbeddingElement</code> interface defined in the Window Object specification. <a href= "#references">[WINDOW]</a> Depending on the type of content instantiated by the <code><a href="#object">object</a></code> element, the node may also support other interfaces. </dd> </dl> The <code><a href="#object">object</a></code> element can represent an external resource, which, depending on the type of the resource, will either be treated as an image, as a nested <a href= "#browsing1">browsing context</a> , or as an external resource to be processed by a <del class="diff-old">third-party software package.</del> <a href="#plugin"><ins class= "diff-chg">plugin</ins></a> . The <dfn id="data" title= "attr-object-data"><code>data</code></dfn> attribute, if present, specifies the address of the resource. If present, the attribute must be a URI (or IRI). The <dfn id="type6" title= "attr-object-type"><code>type</code></dfn> attribute, if present, specifies the type of the resource. If present, the attribute must be a valid MIME type, optionally with parameters. <a href= "#references">[RFC2046]</a> One or both of the <code title="attr-object-data"><a href= "#data">data</a></code> and <code title="attr-object-type"><a href= "#type6">type</a></code> attributes must be present. <del class="diff-old">Whenever</del> <ins class= "diff-chg">The</ins> <dfn id="name3" title= "attr-object-name"><code><ins class= "diff-chg">name</ins></code></dfn> <ins class="diff-chg">attribute, if present, must be a</ins> <a href="#valid8"><ins class= "diff-chg">valid browsing context name</ins></a> . <ins class="diff-chg">When the element is created, and subsequently whenever the</ins> <code title= "attr-object-classid"><ins class="diff-chg">classid</ins></code> <ins class="diff-chg">attribute changes, or, if the</ins> <code title="attr-object-classid"><ins class= "diff-chg">classid</ins></code> <ins class="diff-chg">attribute is not present, whenever</ins> the <code title= "attr-object-data"><a href="#data">data</a></code> attribute changes, or, if <ins class="diff-new">neither</ins> <code title= "attr-object-classid"><ins class="diff-new">classid</ins></code> <ins class="diff-new">attribute nor</ins> the <code title= "attr-object-data"><a href="#data">data</a></code> attribute <del class="diff-old">is not</del> <ins class="diff-chg">are</ins> present, whenever the <code title="attr-object-type"><a href= "#type6">type</a></code> attribute changes, the user agent must run the following steps to determine what the <code><a href= "#object">object</a></code> element represents: <ol> <li> If the <code title="attr-object-classid"><ins class= "diff-new">classid</ins></code> <ins class="diff-new">attribute is present, and has a value that isn't the empty string, then: if the user agent can find a</ins> <a href="#plugin"><ins class= "diff-new">plugin</ins></a> <ins class="diff-new">suitable according to the value of the</ins> <code title= "attr-object-classid"><ins class="diff-new">classid</ins></code> <ins class="diff-new">attribute, and</ins> <a href= "#sandboxPluginObject"><ins class="diff-new">plugins aren't being sandboxed</ins></a> ,<ins class="diff-new">then that</ins> <a href= "#plugin"><ins class="diff-new">plugin</ins></a> <a href= "#object-plugin"><ins class="diff-new">should be used</ins></a> ,<ins class="diff-new">and the value of the</ins> <code title= "attr-object-data"><a href="#data"><ins class= "diff-new">data</ins></a></code> <ins class="diff-new">attribute, if any, should be passed to the</ins> <a href="#plugin"><ins class= "diff-new">plugin</ins></a> .<ins class="diff-new">If no suitable</ins> <a href="#plugin"><ins class= "diff-new">plugin</ins></a> <ins class="diff-new">can be found, or if the</ins> <a href="#plugin"><ins class= "diff-new">plugin</ins></a> <ins class="diff-new">reports an error, jump to the last step in the overall set of steps (fallback).</ins> </li> <li> <ins class="diff-new">If the</ins> <code title= "attr-object-data"><a href="#data">data</a></code> attribute is present, then: <ol> <li> <ins class="diff-new">If the</ins> <code title= "attr-object-type"><a href="#type6"><ins class= "diff-new">type</ins></a></code> <ins class="diff-new">attribute is present and its value is not a type that the user agent supports, and is not a type that the user agent can find a</ins> <a href= "#plugin"><ins class="diff-new">plugin</ins></a> <ins class= "diff-new">for, then the user agent may jump to the last step in the overall set of steps (fallback) without downloading the content to examine its real type.</ins> </li> <li> Begin a load for the resource. The download of the resource must <a href="#delays">delay the <code title="event-load">load</code> event</a> . </li> <li> If the resource is not yet available (e.g. because the resource was not available in the cache, so that loading the resource required making a request over the network), then jump to <ins class="diff-new">the last</ins> step <del class= "diff-old">3</del> in the overall set of steps (fallback). When the resource becomes available, or if the load fails, restart this algorithm from this step. Resources can load incrementally; user agents may opt to consider a resource "available" whenever enough data has been obtained to begin processing the resource. </li> <li> If the load failed (e.g. <ins class="diff-new">an HTTP 404 error, a</ins> DNS error), <a href="#firing5">fire an <code title= "event-error">error</code> event</a> at the element, then jump to <ins class="diff-new">the last</ins> step <del class= "diff-old">3</del> in the overall set of steps (fallback). </li> <li> Determine the <var title="">resource type <del class= "diff-old">,</del></var> , as follows: <del class="diff-old">This says to trust the type. Should we instead use</del> <ol> <li> <ins class="diff-chg">Let</ins> the <del class="diff-old">same mechanism as for browsing contexts?</del> <var title=""><ins class= "diff-chg">resource type</ins></var> <ins class="diff-chg">be unknown.</ins> </li> <li> If the resource has <a href="#content-type8" title= "Content-Type">associated Content-Type metadata <del class= "diff-old">The</del></a> , <ins class="diff-chg">then let the</ins> <var title=""><ins class="diff-chg">resource</ins> type <del class= "diff-old">is</del></var> <ins class="diff-chg">be</ins> the type specified in <a href="#content-type8" title="Content-Type">the resource's Content-Type metadata</a> . <del class= "diff-old">Otherwise, if</del> </li> <li> <ins class="diff-chg">If</ins> the <var title=""><ins class= "diff-new">resource type</ins></var> <ins class="diff-new">is unknown or "</ins> <code title=""><ins class= "diff-new">application/octet-stream</ins></code> <ins class= "diff-new">" and there is a</ins> <code title= "attr-object-type"><a href="#type6">type</a></code> attribute <del class="diff-old">is</del> present <del class= "diff-old">The</del> <ins class="diff-chg">on the</ins> <code><a href="#object"><ins class= "diff-chg">object</ins></a></code> <ins class="diff-chg">element, then change the</ins> <var title=""><ins class= "diff-chg">resource</ins> type <del class="diff-old">is</del></var> <ins class="diff-chg">to instead be</ins> the type specified in <del class="diff-old">the</del> <ins class="diff-chg">that</ins> <code title="attr-object-type"><a href="#type6">type</a></code> attribute. <del class="diff-old">Otherwise, there is no explicit type information The</del> </li> <li> <ins class="diff-chg">If the</ins> <var title=""><ins class= "diff-chg">resource</ins> type</var> is <ins class="diff-new">still unknown, then change</ins> the <var title=""><ins class= "diff-chg">resource type</ins></var> <ins class="diff-chg">to instead be the</ins> <a href="#sniffed" title= "content-type sniffing">sniffed type of the resource <del class= "diff-old">.</del></a> . </li> </ol> </li> <li> Handle the content as given by the first of the following cases that matches: <dl class="switch"> <dt>If the <var title="">resource <del class="diff-old">requires a special handler (e.g.</del> <ins class="diff-chg">type</ins></var> <ins class="diff-chg">can be handled by</ins> a <del class= "diff-old">plugin)</del> <a href="#plugin"><ins class= "diff-chg">plugin</ins></a> <ins class="diff-chg">and</ins> <a href="#sandboxPluginObject"><ins class="diff-chg">plugins aren't being sandboxed</ins></a></dt> <dd> The user agent <a href="#object-plugin">should <del class= "diff-old">find an appropriate handler for the specified resource, based on the resource type found in the previous step,</del> <ins class="diff-chg">use that plugin</ins></a> and pass the content of the resource to that <del class= "diff-old">handler.</del> <a href="#plugin"><ins class= "diff-chg">plugin</ins></a> . If the <del class="diff-old">handler supports a scriptable interface, the HTMLObjectElement</del> <a href="#plugin"><ins class="diff-chg">plugin</ins></a> <del class="diff-old">object representing the element should expose that interface. The handler is not a nested browsing context . If no appropriate handler can be found,</del> <ins class= "diff-chg">reports an error,</ins> then jump to <ins class= "diff-new">the last</ins> step <del class="diff-old">3</del> in the overall set of steps (fallback). <del class="diff-old">The user agent should pass the names and values of all the parameters given by param elements that are children of the object element to the handler used. This specification does not define a mechanism for interacting with third-party handlers, as it is expected to be user-agent-specific. Some UAs might opt to support a plugin mechanism such as the Netscape Plugin API; others may use remote content convertors or have built-in support for certain types. [NPAPI] this doesn't completely duplicate the navigation section, since it handles <param>, etc, but surely some work should be done to work with it</del></dd> <dt>If the <del class="diff-old">type of the</del> <var title= "">resource <ins class="diff-new">type</ins></var> is an XML MIME type</dt> <dt>If the <del class="diff-old">type of the</del> <var title= "">resource <ins class="diff-new">type</ins></var> is HTML</dt> <dt>If the <del class="diff-old">type of the</del> <var title= "">resource <ins class="diff-new">type</ins></var> does not start with " <code>image/</code> "</dt> <dd> The <code><a href="#object">object</a></code> element must be associated with a nested <a href="#browsing1">browsing context</a> , if it does not already have one. The element's nested <a href= "#browsing1">browsing context</a> must then be <a href="#navigate" title="navigate">navigated</a> to the given resource, with <a href= "#replacement">replacement enabled</a> , <ins class="diff-new">and with the</ins> <code><a href="#object"><ins class= "diff-new">object</ins></a></code> <ins class="diff-new">element's document's</ins> <a href="#browsing1"><ins class= "diff-new">browsing context</ins></a> <ins class="diff-new">as the</ins> <a href="#source0"><ins class="diff-new">source browsing context</ins></a> . (The <code title="attr-object-data"><a href= "#data">data</a></code> attribute of the <code><a href= "#object">object</a></code> element doesn't get updated if the browsing context gets further navigated to other locations.) <ins class="diff-new">If the</ins> <code title= "attr-object-name"><a href="#name3"><ins class= "diff-new">name</ins></a></code> <ins class="diff-new">attribute is present, the</ins> <a href="#browsing2"><ins class= "diff-new">browsing context name</ins></a> <ins class= "diff-new">must be set to the value of this attribute; otherwise, the</ins> <a href="#browsing2"><ins class="diff-new">browsing context name</ins></a> <ins class="diff-new">must be set to the empty string.</ins> navigation might end up treating it as something else, because it can do sniffing. how should we handle that? </dd> <dt>If the <var title="">resource <del class="diff-old">is a supported image format,</del> <ins class= "diff-chg">type</ins></var> <ins class="diff-chg">starts with "</ins> <code><ins class="diff-chg">image/</ins></code> <ins class= "diff-chg">",</ins> and support for images has not been disabled</dt> <dd> <ins class="diff-new">Apply the</ins> <a href="#content-type6" title="content-type sniffing: image"><ins class="diff-new">image sniffing</ins></a> <ins class="diff-new">rules to determine the type of the image.</ins> The <code><a href="#object">object</a></code> element represents the specified image. The image is not a nested <a href= "#browsing1">browsing context</a> . <del class="diff-old">shouldn't we use</del> <ins class="diff-chg">If</ins> the <del class= "diff-old">image-sniffing stuff here?</del> <ins class= "diff-chg">image cannot be rendered, e.g. because it is malformed or in an unsupported format, jump to the last step in the overall set of steps (fallback).</ins> </dd> <dt>Otherwise</dt> <dd> The <del class="diff-old">object element represents the specified image, but the image cannot be shown.</del> <ins class= "diff-chg">given</ins> <var title=""><ins class="diff-chg">resource type</ins></var> <ins class="diff-chg">is not supported.</ins> Jump to <ins class="diff-new">the last</ins> step <del class= "diff-old">3 below</del> in the overall set of steps (fallback). </dd> </dl> </li> <li> The element's contents are not part of what the <code><a href= "#object">object</a></code> element represents. </li> <li> Once the resource is completely loaded, <a href="#firing4">fire a <code title="event-load">load</code> event</a> at the element. </li> </ol> </li> <li> If the <code title="attr-object-data"><a href= "#data">data</a></code> attribute is absent but the <code title= "attr-object-type"><a href="#type6">type</a></code> attribute is present, <a href="#sandboxPluginObject"><ins class= "diff-new">plugins aren't being sandboxed</ins></a> , and <del class="diff-old">if</del> the user agent can find a <del class="diff-old">handler</del> <a href="#plugin"><ins class= "diff-chg">plugin</ins></a> suitable according to the value of the <code title="attr-object-type"><a href="#type6">type</a></code> attribute, then that <del class="diff-old">handler should be used. If the handler supports a scriptable interface, the HTMLObjectElement</del> <a href="#plugin"><ins class= "diff-chg">plugin</ins></a> <del class="diff-old">object representing the element</del> <a href="#object-plugin">should <del class="diff-old">expose that interface. The handler is not a nested browsing context</del> <ins class="diff-chg">be used</ins></a> . If no suitable <del class="diff-old">handler</del> <a href="#plugin"><ins class="diff-chg">plugin</ins></a> can be found, <ins class="diff-new">or if the</ins> <a href= "#plugin"><ins class="diff-new">plugin</ins></a> <ins class= "diff-new">reports an error,</ins> jump to the next step (fallback). </li> <li> (Fallback.) The <code><a href="#object">object</a></code> element <del class="diff-old">doesn't represent anything except</del> <ins class="diff-chg">represents</ins> what the element's contents represent, ignoring any leading <code><a href= "#param">param</a></code> element children. This is the element's <a href="#fallback">fallback content</a> . </li> </ol> <del class="diff-old">In</del> <ins class="diff-chg">When</ins> the <del class="diff-old">absence of other factors (such as style sheets), user agents must show</del> <ins class= "diff-chg">algorithm above instantiates a</ins> <a href= "#plugin"><ins class="diff-chg">plugin</ins></a> , the user <del class="diff-old">what</del> <ins class="diff-chg">agent should pass the names and values of all the</ins> <ins class= "diff-chg">parameters</ins> <ins class="diff-chg">given by</ins> <code><a href="#param"><ins class= "diff-chg">param</ins></a></code> <ins class="diff-chg">elements that are children of</ins> the <code><a href= "#object">object</a></code> element <del class= "diff-old">represents. Thus,</del> <ins class="diff-chg">to the</ins> <a href="#plugin"><ins class="diff-chg">plugin</ins></a> <ins class="diff-chg">used. If the</ins> <a href= "#plugin"><ins class="diff-chg">plugin</ins></a> <ins class= "diff-chg">supports a scriptable interface, the</ins> <code><a href="#htmlobjectelement"><ins class= "diff-chg">HTMLObjectElement</ins></a></code> <ins class= "diff-chg">object representing the element should expose that interface. The</ins> <a href="#plugin"><ins class= "diff-chg">plugin</ins></a> <ins class="diff-chg">is not a nested</ins> <a href="#browsing1"><ins class="diff-chg">browsing context</ins></a> . <ins class="diff-chg">If the</ins> <a href="#sandboxed0"><ins class="diff-chg">sandboxed plugins browsing context flag</ins></a> <ins class="diff-chg">is set on the</ins> <a href="#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">for which the</ins> <code><a href="#object"><ins class= "diff-chg">object</ins></a></code> <ins class="diff-chg">element's document is the</ins> <a href="#active"><ins class= "diff-chg">active document</ins></a> ,<ins class="diff-chg">then the steps above must always act as if they had failed to find a</ins> <a href="#plugin"><ins class="diff-chg">plugin</ins></a> ,<ins class="diff-chg">even if one would otherwise have been used.</ins> <ins class="diff-chg">Due to the algorithm above,</ins> the contents of <code><a href="#object">object</a></code> elements act as <a href="#fallback">fallback content</a> , <del class= "diff-old">to be</del> used only when referenced resources can't be shown (e.g. because it returned a 404 error). This allows multiple <code><a href="#object">object</a></code> elements to be nested inside each other, targeting multiple user agents with different capabilities, with the user agent picking the <del class= "diff-old">best</del> <ins class="diff-chg">first</ins> one it supports. <ins class="diff-new">Whenever the</ins> <code title= "attr-object-name"><a href="#name3"><ins class= "diff-new">name</ins></a></code> <ins class="diff-new">attribute is set, if the</ins> <code><a href="#object"><ins class= "diff-new">object</ins></a></code> <ins class="diff-new">element has a nested</ins> <a href="#browsing1"><ins class= "diff-new">browsing context</ins></a> ,<ins class= "diff-new">its</ins> <a href="#browsing2" title= "browsing context name"><ins class="diff-new">name</ins></a> <ins class="diff-new">must be changed to the new value. If the attribute is removed, if the</ins> <code><a href= "#object"><ins class="diff-new">object</ins></a></code> <ins class= "diff-new">element has a</ins> <a href="#browsing1"><ins class= "diff-new">browsing context</ins></a> ,<ins class= "diff-new">the</ins> <a href="#browsing2"><ins class= "diff-new">browsing context name</ins></a> <ins class= "diff-new">must be set to the empty string.</ins> The <code title="attr-hyperlink-usemap"><a href= "#usemap1">usemap</a></code> attribute, if present while the <code><a href="#object">object</a></code> element represents an image, can indicate that the object has an associated <a href= "#image">image map</a> . The attribute must be ignored if the <code><a href="#object">object</a></code> element doesn't represent an image. The <code><a href="#object">object</a></code> element supports <a href="#dimension0">dimension attributes</a> . The DOM attributes <dfn id="data0" title= "dom-object-data"><code>data</code></dfn> , <dfn id="type7" title= "dom-object-type"><code>type</code></dfn> , <dfn id="name4" title= "dom-object-name"><code><ins class= "diff-new">name</ins></code></dfn> , and <dfn id="usemap0" title= "dom-object-useMap"><code>useMap</code></dfn> each must <a href= "#reflect">reflect</a> the respective content attributes of the same name. <div class="example"> <ins class="diff-new">In the following example, a Java applet is embedded in a page using the</ins> <code><a href= "#object"><ins class="diff-new">object</ins></a></code> <ins class= "diff-new">element. (Generally speaking, it is better to avoid using applets like these and instead use native JavaScript and HTML to provide the functionality, since that way the application will work on all Web browsers without requiring a third-party plugin. Many devices, especially embedded devices, do not support third-party technologies like Java.)</ins> <pre> <figure><ins class="diff-new"> <object type="application/x-java-applet"> <param name="code" value="MyJavaClass"> <p>You do not have Java available, or it is disabled. </object> <legend>My Java Clock</legend> </figure> </ins> </pre></div> <div class="example"> <ins class="diff-new">In this example, an HTML page is embedded in another using the</ins> <code><a href="#object"><ins class= "diff-new">object</ins></a></code> <ins class= "diff-new">element.</ins> <pre> <figure><ins class="diff-new"> <object data="clock.html"></object> <legend>My HTML Clock</legend> </figure> </ins> </pre></div> <h4 id="the-param"><del class= "diff-old">3.14.6.</del> <ins class="diff-chg">3.12.6</ins> The <dfn id="param"><code>param</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As a child of an <code><a href="#object">object</a></code> element, before any <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> .</dd> <dt>Content model:</dt> <dd>Empty.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-param-name"><a href= "#name5">name</a></code></dd> <dd><code title="attr-param-value"><a href= "#value5">value</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlparamelement">HTMLParamElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { <del class="diff-old"> attribute DOMString ; </del> <ins class="diff-chg"> attribute DOMString <a href= "#name6" title="dom-param-name">name</a>; </ins> attribute DOMString <a href="#value6" title= "dom-param-value">value</a>; }; </pre></dd> </dl> The <code><a href="#param">param</a></code> element defines parameters for <del class="diff-old">handlers</del> <ins class= "diff-chg">plugins</ins> invoked by <code><a href= "#object">object</a></code> elements. The <dfn id="name5" title= "attr-param-name"><code>name</code></dfn> attribute gives the name of the parameter. The <dfn id="value5" title= "attr-param-value"><code>value</code></dfn> attribute gives the value of the parameter. Both attributes must be present. They may have any value. If both attributes are present, and if the parent element of the <code><a href="#param">param</a></code> is an <code><a href= "#object">object</a></code> element, then the element defines a <dfn id="parameter" title= "concept-param-parameters">parameter</dfn> with the given name/value pair. The DOM attributes <dfn id="name6" title= "dom-param-name"><code>name</code></dfn> and <dfn id="value6" title="dom-param-value"><code>value</code></dfn> must both <a href= "#reflect">reflect</a> the respective content attributes of the same name. <h4 id="video"><del class= "diff-old">3.14.7.</del> <ins class="diff-chg">3.12.7</ins> The <dfn id="video1"><code>video</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#embedded1">Embedded content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#embedded1">embedded content</a> is expected.</dd> <dt>Content model:</dt> <dd>If the element has a <code title="attr-media-src"><a href= "#src7">src</a></code> attribute: <a href= "#transparent0">transparent</a> .</dd> <dd>If the element does not have a <code title= "attr-media-src"><a href="#src7">src</a></code> attribute: one or more <code><a href="#source">source</a></code> elements, then, <a href="#transparent0">transparent</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-media-src"><a href= "#src7">src</a></code></dd> <dd><code title="attr-video-poster"><a href= "#poster">poster</a></code></dd> <dd><code title="attr-media-autoplay"><a href= "#autoplay">autoplay</a></code></dd> <dd><code title="attr-media-start"><a href= "#start2">start</a></code></dd> <dd><code title="attr-media-loopstart"><a href= "#loopstart">loopstart</a></code></dd> <dd><code title="attr-media-loopend"><a href= "#loopend">loopend</a></code></dd> <dd><code title="attr-media-end"><a href="#end">end</a></code></dd> <dd><code title="attr-media-playcount"><a href= "#playcount">playcount</a></code></dd> <dd><code title="attr-media-controls"><a href= "#controls">controls</a></code></dd> <dd><code title="attr-dim-width"><a href= "#width4">width</a></code></dd> <dd><code title="attr-dim-height"><a href= "#height3">height</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlvideoelement">HTMLVideoElement</dfn> : <a href= "#htmlmediaelement">HTMLMediaElement</a> { <del class="diff-old"> attribute long ; </del> <ins class="diff-chg"> attribute long <a href="#width5" title="dom-dim-width">width</a>; </ins> attribute long <a href="#height4" title= "dom-dim-height">height</a>; readonly attribute unsigned long <a href="#videowidth" title= "dom-video-videoWidth">videoWidth</a>; readonly attribute unsigned long <a href="#videoheight" title= "dom-video-videoHeight">videoHeight</a>; attribute DOMString <a href="#poster0" title= "dom-video-poster">poster</a>; }; </pre></dd> </dl> A <code><a href="#video1">video</a></code> element represents a video or movie. Content may be provided inside the <code><a href= "#video1">video</a></code> element. User agents should not show this content to the user; it is intended for older Web browsers which do not support <code><a href="#video1">video</a></code> , so that legacy video plugins can be tried, or to show text to the users of these older browser informing them of how to access the video contents. In particular, this content is not <a href= "#fallback">fallback content</a> intended to address accessibility concerns. To make video content accessible to the blind, deaf, and those with other physical or cognitive disabilities, authors are expected to provide alternative media streams and/or to embed accessibility aids (such as caption or subtitle tracks) into their media streams. The <code><a href="#video1">video</a></code> element is a <a href="#media7">media element</a> whose <a href="#media9">media data</a> is ostensibly video data, possibly with associated audio data. The <code title="attr-media-src"><a href="#src7">src</a></code> , <code title="attr-media-autoplay"><a href= "#autoplay">autoplay</a></code> , <code title= "attr-media-start"><a href="#start2">start</a></code> , <code title="attr-media-loopstart"><a href= "#loopstart">loopstart</a></code> , <code title= "attr-media-loopend"><a href="#loopend">loopend</a></code> , <code title="attr-media-end"><a href="#end">end</a></code> , <code title="attr-media-playcount"><a href= "#playcount">playcount</a></code> , and <code title= "attr-media-controls"><a href="#controls">controls</a></code> attributes are <a href="#media8" title= "media element attributes">the attributes common to all media elements</a> . The <code><a href="#video1">video</a></code> element supports <a href="#dimension0">dimension attributes</a> . The <dfn id="poster" title= "attr-video-poster"><code>poster</code></dfn> attribute gives the address of an image file that the user agent can show while no video data is available. The attribute, if present, must contain a URI (or IRI). The <dfn id="poster0" title= "dom-video-poster"><code>poster</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the <code title= "attr-video-poster"><a href="#poster">poster</a></code> content attribute. The <dfn id="videowidth" title= "dom-video-videoWidth"><code>videoWidth</code></dfn> DOM attribute must return the native width of the video in CSS pixels. The <dfn id="videoheight" title= "dom-video-videoHeight"><code>videoHeight</code></dfn> DOM attribute must return the native height of the video in CSS pixels. In the absence of resolution information defining the mapping of pixels in the video to physical dimensions, user agents may assume that one pixel in the video corresponds to one CSS pixel. If no video data is available, then the attributes must return 0. When no video data is available (the element's <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute is either <code title="dom-media-EMPTY"><a href="#empty">EMPTY</a></code> , <code title="dom-media-LOADING"><a href= "#loading0">LOADING</a></code> , or <code title= "dom-media-LOADED_METADATA"><a href= "#loadedmetadata">LOADED_METADATA</a></code> ), <code><a href= "#video1">video</a></code> elements represent either the image given by the <code title="attr-video-poster"><a href= "#poster">poster</a></code> attribute, or nothing. When a <code><a href="#video1">video</a></code> element is <a href="#actively">actively playing</a> , it represents the frame of video at the continuously increasing <a href="#current0" title= "current playback position">"current" position</a> . When the <a href="#current0">current playback position</a> changes such that the last frame rendered is no longer the frame corresponding to the <a href="#current0">current playback position</a> in the video, the new frame must be rendered. Similarly, any audio associated with the video must, if played, be played <del class= "diff-old">synchronised</del> <ins class= "diff-chg">synchronized</ins> with the <a href="#current0">current playback position</a> , at the specified <a href="#volume" title= "dom-media-volume">volume</a> with the specified <a href="#muted" title="dom-media-muted">mute state</a> . When a <code><a href="#video1">video</a></code> element is <a href="#paused" title="dom-media-paused">paused <del class= "diff-old">,</del></a> <ins class="diff-chg">and the</ins> <a href= "#current0" title="current playback position"><ins class= "diff-chg">current playback position</ins></a> <ins class= "diff-chg">is the first frame of video,</ins> the element represents <ins class="diff-new">either</ins> the frame of video corresponding to the <a href="#current0" title= "current playback position"><ins class="diff-chg">current playback position</ins></a> <ins class="diff-chg">or the image given by the</ins> <code title="attr-video-poster"><a href= "#poster"><ins class="diff-chg">poster</ins></a></code> <ins class= "diff-chg">attribute, at the discretion of the user agent.</ins> <ins class="diff-chg">When a</ins> <code><a href= "#video1"><ins class="diff-chg">video</ins></a></code> <ins class= "diff-chg">element is</ins> <a href="#paused" title= "dom-media-paused"><ins class="diff-chg">paused</ins></a> <ins class="diff-chg">at any other position, the element represents the frame of video corresponding to the</ins> <a href="#current0" title="current playback position">current playback position</a> , or, if that is not <del class="diff-old">available</del> yet <ins class="diff-new">available</ins> (e.g. because the video is seeking or buffering), the last <del class= "diff-old">rendered</del> frame of <del class= "diff-old">video.</del> <ins class="diff-chg">the video to have been rendered.</ins> When a <code><a href="#video1">video</a></code> element is neither <a href="#actively">actively playing</a> nor <a href= "#paused" title="dom-media-paused">paused</a> (e.g. when seeking or stalled), the element represents the last frame of the video to have been rendered. Which frame in a video stream corresponds to a particular playback position is defined by the video stream's format. Video content should be rendered inside the element's playback area such that the video content is shown centered in the playback area at the largest possible size that fits completely within it, with the video content's <a href="#adjusted"><ins class= "diff-new">adjusted</ins> aspect ratio</a> being preserved. Thus, if the aspect ratio of the playback area does not match the <a href="#adjusted"><ins class="diff-new">adjusted</ins> aspect ratio</a> of the video, the video will be shown letterboxed. Areas of the element's playback area that do not contain the video represent nothing. <ins class="diff-new">The</ins> <dfn id="adjusted"><ins class= "diff-new">adjusted aspect ratio</ins></dfn> <ins class= "diff-new">of a video is the ratio of its</ins> <a href= "#adjusted0"><ins class="diff-new">adjusted width</ins></a> <ins class="diff-new">to its intrinsic height. The</ins> <dfn id= "adjusted0"><ins class="diff-new">adjusted width</ins></dfn> <ins class="diff-new">of a video is its intrinsic width multiplied by its</ins> <a href="#pixel0"><ins class="diff-new">pixel ratio</ins></a> . In addition to the above, the user agent may provide messages to the user (such as "buffering", "no video loaded", "error", or more detailed information) by overlaying text or icons on the video or other areas of the element's playback area, or in another appropriate manner. User agents that cannot render the video may instead make the element represent a link to an external video playback utility or to the video data itself. User agents should provide controls to enable or disable the display of closed captions associated with the video stream, though such features should, again, not interfere with the page's normal rendering. User agents may allow users to view the video content in manners more suitable to the user (e.g. full-screen or in an independent resizable window). As for the other user interface features, controls to enable this should not interfere with the page's normal rendering unless the user agent is <a href="#expose" title= "expose a user interface to the user">exposing a user interface</a> . In such an independent context, however, user agents may make full user interfaces visible, with, e.g., play, pause, seeking, and volume controls, even if the <code title= "attr-media-controls"><a href="#controls">controls</a></code> attribute is absent. User agents may allow video playback to affect system features that could interfere with the user's experience; for example, user agents could disable screensavers while video playback is in progress. User agents should not provide a public API to cause videos to be shown full-screen. A script, combined with a carefully crafted video file, could trick the user into thinking a system-modal dialog had been shown, and prompt the user for a password. There is also the danger of "mere" annoyance, with pages launching full-screen videos when links are clicked or pages navigated. Instead, user-agent specific interface features may be provided to easily allow the user to obtain a full-screen playback mode. <ins class="diff-new">The spec does not currently define the interaction of the "controls" attribute with the "height" and "width" attributes. This will likely be defined in the rendering section based on implementation experience. So far, browsers seem to be making the controls overlay-only, thus somewhat sidestepping the issue.</ins> <h5 id="video0"><del class= "diff-old">3.14.7.1.</del> <ins class= "diff-chg">3.12.7.1.</ins> Video and audio codecs for <code><a href="#video1">video</a></code> elements</h5> User agents may support any video and audio codecs and container formats. It would be helpful for interoperability if all browsers could support the same codecs. However, there are no known codecs that satisfy all the current players: we need a codec that is known to not require per-unit or per-distributor licensing, that is compatible with the open source development model, that is of sufficient quality as to be usable, and that is not an additional submarine patent risk for large companies. This is an ongoing issue and this section will be updated once more information is available. Certain user agents might support no codecs at all, e.g. text browsers running over SSH connections. <h4 id="audio"><del class= "diff-old">3.14.8.</del> <ins class="diff-chg">3.12.8</ins> The <dfn id="audio1"><code>audio</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#embedded1">Embedded content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#embedded1">embedded content</a> is expected.</dd> <dt>Content model:</dt> <dd>If the element has a <code title="attr-media-src"><a href= "#src7">src</a></code> attribute: <a href= "#transparent0">transparent</a> .</dd> <dd>If the element does not have a <code title= "attr-media-src"><a href="#src7">src</a></code> attribute: one or more <code><a href="#source">source</a></code> elements, then, <a href="#transparent0">transparent</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-media-src"><a href= "#src7">src</a></code></dd> <dd><code title="attr-media-autoplay"><a href= "#autoplay">autoplay</a></code></dd> <dd><code title="attr-media-start"><a href= "#start2">start</a></code></dd> <dd><code title="attr-media-loopstart"><a href= "#loopstart">loopstart</a></code></dd> <dd><code title="attr-media-loopend"><a href= "#loopend">loopend</a></code></dd> <dd><code title="attr-media-end"><a href="#end">end</a></code></dd> <dd><code title="attr-media-playcount"><a href= "#playcount">playcount</a></code></dd> <dd><code title="attr-media-controls"><a href= "#controls">controls</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlaudioelement">HTMLAudioElement</dfn> : <a href= "#htmlmediaelement">HTMLMediaElement</a> { // no members }; </pre></dd> </dl> An <code><a href="#audio1">audio</a></code> element represents a sound or audio stream. Content may be provided inside the <code><a href= "#audio1">audio</a></code> element. User agents should not show this content to the user; it is intended for older Web browsers which do not support <code><a href="#audio1">audio</a></code> , so that legacy audio plugins can be tried, or to show text to the users of these older browser informing them of how to access the audio contents. In particular, this content is not <a href= "#fallback">fallback content</a> intended to address accessibility concerns. To make audio content accessible to the deaf or to those with other physical or cognitive disabilities, authors are expected to provide alternative media streams and/or to embed accessibility aids (such as transcriptions) into their media streams. The <code><a href="#audio1">audio</a></code> element is a <a href="#media7">media element</a> whose <a href="#media9">media data</a> is ostensibly audio data. The <code title="attr-media-src"><a href="#src7">src</a></code> , <code title="attr-media-autoplay"><a href= "#autoplay">autoplay</a></code> , <code title= "attr-media-start"><a href="#start2">start</a></code> , <code title="attr-media-loopstart"><a href= "#loopstart">loopstart</a></code> , <code title= "attr-media-loopend"><a href="#loopend">loopend</a></code> , <code title="attr-media-end"><a href="#end">end</a></code> , <code title="attr-media-playcount"><a href= "#playcount">playcount</a></code> , and <code title= "attr-media-controls"><a href="#controls">controls</a></code> attributes are <a href="#media8" title= "media element attributes">the attributes common to all media elements</a> . When an <code><a href="#audio1">audio</a></code> element is <a href="#actively">actively playing</a> , it must have its audio data played <del class="diff-old">synchronised</del> <ins class= "diff-chg">synchronized</ins> with the <a href="#current0">current playback position</a> , at the specified <a href="#volume" title= "dom-media-volume">volume</a> with the specified <a href="#muted" title="dom-media-muted">mute state</a> . When an <code><a href="#audio1">audio</a></code> element is not <a href="#actively">actively playing</a> , audio must not play for the element. <h5 id="audio0"><del class= "diff-old">3.14.8.1.</del> <ins class= "diff-chg">3.12.8.1.</ins> Audio codecs for <code><a href= "#audio1">audio</a></code> elements</h5> User agents may support any audio codecs and container formats. User agents must support the WAVE container format with audio encoded using the PCM format. <h4 id="the-source"><ins class= "diff-new">3.12.9</ins> <ins class="diff-new">The</ins> <dfn id="source"><code><ins class= "diff-new">source</ins></code></dfn> <ins class= "diff-new">element</ins></h4> <dl class="element"> <dt><ins class="diff-new">Categories</ins></dt> <dd><ins class="diff-new">None.</ins></dd> <dt><ins class="diff-new">Contexts in which this element may be used:</ins></dt> <dd><ins class="diff-new">As a child of a</ins> <a href= "#media7"><ins class="diff-new">media element</ins></a> ,<ins class="diff-new">before any</ins> <a href= "#flow-content0"><ins class="diff-new">flow content</ins></a> .</dd> <dt><ins class="diff-new">Content model:</ins></dt> <dd><ins class="diff-new">Empty.</ins></dd> <dt><ins class="diff-new">Element-specific attributes:</ins></dt> <dd><code title="attr-source-src"><a href="#src5"><ins class= "diff-new">src</ins></a></code></dd> <dd><code title="attr-source-type"><a href="#type8"><ins class= "diff-new">type</ins></a></code></dd> <dd><code title="attr-source-media"><a href="#media5"><ins class= "diff-new">media</ins></a></code></dd> <dd><code title="attr-source-pixelratio"><a href= "#pixelratio"><ins class= "diff-new">pixelratio</ins></a></code></dd> <dt><ins class="diff-new">DOM interface:</ins></dt> <dd> <pre ins="" class="diff-new"> class=idl>interface <dfn id= "htmlsourceelement">HTMLSourceElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute DOMString <a href="#src6" title= "dom-source-src">src</a>; attribute DOMString <a href="#type9" title= "dom-source-type">type</a>; attribute DOMString <a href="#media6" title= "dom-source-media">media</a>; attribute float <a href="#pixelratio0" title= "dom-source-pixelRatio">pixelRatio</a>; }; </pre></dd> </dl> <ins class="diff-new">The</ins> <code><a href= "#source"><ins class="diff-new">source</ins></a></code> <ins class= "diff-new">element allows authors to specify multiple</ins> <a href="#media10" title="media resource"><ins class= "diff-new">media resources</ins></a> <ins class= "diff-new">for</ins> <a href="#media7" title= "media element"><ins class="diff-new">media elements</ins></a> . <ins class="diff-new">The</ins> <dfn id="src5" title= "attr-source-src"><code><ins class= "diff-new">src</ins></code></dfn> <ins class="diff-new">attribute gives the address of the</ins> <a href="#media10"><ins class= "diff-new">media resource</ins></a> .<ins class="diff-new">The value must be a URI (or IRI). This attribute must be present.</ins> <ins class="diff-new">The</ins> <dfn id="type8" title= "attr-source-type"><code><ins class= "diff-new">type</ins></code></dfn> <ins class="diff-new">attribute gives the type of the</ins> <a href="#media10"><ins class= "diff-new">media resource</ins></a> ,<ins class="diff-new">to help the user agent determine if it can play this</ins> <a href= "#media10"><ins class="diff-new">media resource</ins></a> <ins class="diff-new">before downloading it. Its value must be a MIME type. The</ins> <code title=""><ins class= "diff-new">codecs</ins></code> <ins class="diff-new">parameter may be specified and might be necessary to specify exactly how the resource is encoded.</ins> <a href="#references"><ins class= "diff-new">[RFC2046]</ins></a> <a href="#references"><ins class= "diff-new">[RFC4281]</ins></a> <div class="example"> <ins class="diff-new">The following list shows some examples of how to use the</ins> <code title=""><ins class= "diff-new">codecs=</ins></code> <ins class="diff-new">MIME parameter in the</ins> <code title="attr-source-type"><a href= "#type8"><ins class="diff-new">type</ins></a></code> <ins class= "diff-new">attribute.</ins> <dl> <dt><ins class="diff-new">H.264 Simple baseline profile video (main and extended video compatible) level 3 and Low-Complexity AAC audio in MP4 container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="video.mp4" type="video/mp4; codecs=&quot;avc1.42E01E, mp4a.40.2&quot;"> </ins> </pre></dd> <dt><ins class="diff-new">H.264 Extended profile video (baseline-compatible) level 3 and Low-Complexity AAC audio in MP4 container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="video.mp4" type="video/mp4; codecs=&quot;avc1.58A01E, mp4a.40.2&quot;"> </ins> </pre></dd> <dt><ins class="diff-new">H.264 Main profile video level 3 and Low-Complexity AAC audio in MP4 container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="video.mp4" type="video/mp4; codecs=&quot;avc1.4D401E, mp4a.40.2&quot;"> </ins> </pre></dd> <dt><ins class="diff-new">H.264 "High" profile video (incompatible with main, baseline, or extended profiles) level 3 and Low-Complexity AAC audio in MP4 container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="video.mp4" type="video/mp4; codecs=&quot;avc1.64001E, mp4a.40.2&quot;"> </ins> </pre></dd> <dt><ins class="diff-new">MPEG-4 Visual Simple Profile Level 0 video and Low-Complexity AAC audio in MP4 container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="video.mp4" type="video/mp4; codecs=&quot;mp4v.20.8, mp4a.40.2&quot;"> </ins> </pre></dd> <dt><ins class="diff-new">MPEG-4 Advanced Simple Profile Level 0 video and Low-Complexity AAC audio in MP4 container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="video.mp4" type="video/mp4; codecs=&quot;mp4v.20.240, mp4a.40.2&quot;"> </ins> </pre></dd> <dt><ins class="diff-new">MPEG-4 Visual Simple Profile Level 0 video and AMR audio in 3GPP container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="video.3gp" type="video/3gpp; codecs=&quot;mp4v.20.8, samr&quot;"> </ins> </pre></dd> <dt><ins class="diff-new">Theora video and Vorbis audio in Ogg container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="video.ogv" type="video/ogg; codecs=&quot;theora, vorbis&quot;"> </ins> </pre></dd> <dt><ins class="diff-new">Theora video and Speex audio in Ogg container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="video.ogv" type="video/ogg; codecs=&quot;theora, speex&quot;"> </ins> </pre></dd> <dt><ins class="diff-new">Vorbis audio alone in Ogg container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="audio.ogg" type="audio/ogg; codecs=vorbis"> </ins> </pre></dd> <dt><ins class="diff-new">Speex audio alone in Ogg container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="audio.spx" type="audio/ogg; codecs=speex"> </ins> </pre></dd> <dt><ins class="diff-new">FLAC audio alone in Ogg container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="audio.oga" type="audio/ogg; codecs=flac"> </ins> </pre></dd> <dt><ins class="diff-new">Dirac video and Vorbis audio in Ogg container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="video.ogv" type="video/ogg; codecs=&quot;dirac, vorbis&quot;"> </ins> </pre></dd> <dt><ins class="diff-new">Theora video and Vorbis audio in Matroska container</ins></dt> <dd> <pre> <ins class="diff-new"> <source src="video.mkv" type="video/x-matroska; codecs=&quot;theora, vorbis&quot;"> </ins> </pre></dd> </dl> </div> <ins class="diff-new">The</ins> <dfn id="media5" title= "attr-source-media"><code><ins class= "diff-new">media</ins></code></dfn> <ins class="diff-new">attribute gives the intended media type of the</ins> <a href= "#media10"><ins class="diff-new">media resource</ins></a> ,<ins class="diff-new">to help the user agent determine if this</ins> <a href="#media10"><ins class="diff-new">media resource</ins></a> <ins class="diff-new">is useful to the user before downloading it. Its value must be a valid</ins> <a href= "#mq"><ins class="diff-new">media query</ins></a> .<a href= "#references"><ins class="diff-new">[MQ]</ins></a> <ins class="diff-new">Either the</ins> <code title= "attr-source-type"><a href="#type8"><ins class= "diff-new">type</ins></a></code> <ins class="diff-new">attribute, the</ins> <code title="attr-source-media"><a href= "#media5"><ins class="diff-new">media</ins></a></code> <ins class= "diff-new">attribute or both, must be specified, unless this is the last</ins> <code><a href="#source"><ins class= "diff-new">source</ins></a></code> <ins class="diff-new">element child of the parent element.</ins> <ins class="diff-new">The</ins> <dfn id="pixelratio" title= "attr-source-pixelratio"><code><ins class= "diff-new">pixelratio</ins></code></dfn> <ins class= "diff-new">attribute allows the author to specify the pixel ratio of anamorphic</ins> <a href="#media10" title= "media resource"><ins class="diff-new">media resources</ins></a> <ins class="diff-new">that do not self-describe their pixel ratio. The attribute value, if specified, must be a</ins> <a href= "#valid1"><ins class="diff-new">valid floating point number</ins></a> <ins class="diff-new">giving the ratio of the correct rendered width of each pixel to the actual width of each pixel in the image (i.e., the multiple by which the video's intrinsic width is to be multiplied to obtain the rendered width that gives the correct aspect ratio). The default value, if the attribute is omitted or cannot be parsed, is 1.0.</ins> <ins class="diff-new">If a</ins> <code><a href= "#source"><ins class="diff-new">source</ins></a></code> <ins class= "diff-new">element is inserted into a</ins> <a href= "#media7"><ins class="diff-new">media element</ins></a> <ins class= "diff-new">that is already in a document and whose</ins> <code title="dom-media-networkState"><a href= "#networkstate"><ins class="diff-new">networkState</ins></a></code> <ins class="diff-new">is in the</ins> <code title= "dom-media-EMPTY"><a href="#empty"><ins class= "diff-new">EMPTY</ins></a></code> <ins class="diff-new">state, the user agent must implicitly invoke the</ins> <code title= "dom-media-load"><a href="#load"><ins class= "diff-new">load()</ins></a></code> <ins class="diff-new">method on the</ins> <a href="#media7"><ins class="diff-new">media element</ins></a> <ins class="diff-new">as soon as all other scripts have finished executing. Any exceptions raised must be ignored.</ins> <ins class="diff-new">The DOM attributes</ins> <dfn id="src6" title="dom-source-src"><code><ins class= "diff-new">src</ins></code></dfn> ,<dfn id="type9" title= "dom-source-type"><code><ins class= "diff-new">type</ins></code></dfn> ,<ins class="diff-new">and</ins> <dfn id="media6" title="dom-source-media"><code><ins class= "diff-new">media</ins></code></dfn> <ins class= "diff-new">must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the respective content attributes of the same name.</ins> <ins class="diff-new">The DOM attribute</ins> <dfn id= "pixelratio0" title="dom-source-pixelRatio"><code><ins class= "diff-new">pixelRatio</ins></code></dfn> <ins class= "diff-new">must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the</ins> <code title="attr-source-pixelratio"><a href= "#pixelratio"><ins class="diff-new">pixelratio</ins></a></code> <ins class="diff-new">content attribute.</ins> <h4 id="media"><del class= "diff-old">3.14.9.</del> <ins class="diff-chg">3.12.10</ins> Media elements</h4> <dfn id="media7" title="media element">Media elements</dfn> implement the following interface: <pre class="idl"> interface <dfn id= "htmlmediaelement">HTMLMediaElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { // error state readonly attribute <a href="#mediaerror">MediaError</a> <a href= "#error0" title="dom-media-error">error</a>; // network state <del class="diff-old"> attribute DOMString ; </del> <ins class="diff-chg"> attribute DOMString <a href= "#src8" title="dom-media-src">src</a>; </ins> readonly attribute DOMString <a href="#currentsrc" title= "dom-media-currentSrc">currentSrc</a>; const unsigned short <a href="#empty" title= "dom-media-EMPTY">EMPTY</a> = 0; const unsigned short <a href="#loading0" title= "dom-media-LOADING">LOADING</a> = 1; const unsigned short <a href="#loadedmetadata" title= "dom-media-LOADED_METADATA">LOADED_METADATA</a> = 2; const unsigned short <a href="#loadedfirstframe" title= "dom-media-LOADED_FIRST_FRAME">LOADED_FIRST_FRAME</a> = 3; const unsigned short <a href="#loaded" title= "dom-media-LOADED">LOADED</a> = 4; readonly attribute unsigned short <a href="#networkstate" title= "dom-media-networkState">networkState</a>; readonly attribute float <a href="#bufferingrate" title= "dom-media-bufferingRate">bufferingRate</a>; <ins class="diff-new"> readonly attribute boolean <a href= "#bufferingthrottled" title= "dom-media-bufferingThrottled">bufferingThrottled</a>; </ins> readonly attribute <a href="#timeranges">TimeRanges</a> <a href= "#buffered" title="dom-media-buffered">buffered</a>; <ins class="diff-new"> readonly attribute <a href= "#byteranges">ByteRanges</a> <a href="#bufferedbytes" title= "dom-media-bufferedBytes">bufferedBytes</a>; readonly attribute unsigned long <a href="#totalbytes" title= "dom-media-totalBytes">totalBytes</a>; </ins> void <a href="#load" title="dom-media-load">load</a>(); // ready state const unsigned short <a href="#dataunavailable" title= "dom-media-DATA_UNAVAILABLE">DATA_UNAVAILABLE</a> = 0; const unsigned short <a href="#canshowcurrentframe" title= "dom-media-CAN_SHOW_CURRENT_FRAME">CAN_SHOW_CURRENT_FRAME</a> = 1; const unsigned short <a href="#canplay" title= "dom-media-CAN_PLAY">CAN_PLAY</a> = 2; const unsigned short <a href="#canplaythrough" title= "dom-media-CAN_PLAY_THROUGH">CAN_PLAY_THROUGH</a> = 3; <del class="diff-old"> readonly attribute unsigned short ; </del> <ins class="diff-chg"> readonly attribute unsigned short <a href= "#readystate0" title="dom-media-readyState">readyState</a>; </ins> readonly attribute boolean <a href="#seeking0" title= "dom-media-seeking">seeking</a>; // playback state attribute float <a href="#currenttime" title= "dom-media-currentTime">currentTime</a>; readonly attribute float <a href="#duration" title= "dom-media-duration">duration</a>; readonly attribute boolean <a href="#paused" title= "dom-media-paused">paused</a>; attribute float <a href="#defaultplaybackrate" title= "dom-media-defaultPlaybackRate">defaultPlaybackRate</a>; attribute float <a href="#playbackrate" title= "dom-media-playbackRate">playbackRate</a>; readonly attribute <a href="#timeranges">TimeRanges</a> <a href= "#played" title="dom-media-played">played</a>; readonly attribute <a href="#timeranges">TimeRanges</a> <a href= "#seekable" title="dom-media-seekable">seekable</a>; readonly attribute boolean <a href="#ended0" title= "dom-media-ended">ended</a>; attribute boolean <a href="#autoplay0" title= "dom-media-autoplay">autoplay</a>; void <a href="#play" title="dom-media-play">play</a>(); void <a href="#pause0" title="dom-media-pause">pause</a>(); // looping attribute float <a href="#start3" title= "dom-media-start">start</a>; attribute float <a href="#end0" title= "dom-media-end">end</a>; attribute float <a href="#loopstart0" title= "dom-media-loopStart">loopStart</a>; attribute float <a href="#loopend0" title= "dom-media-loopEnd">loopEnd</a>; attribute unsigned long <a href="#playcount0" title= "dom-media-playCount">playCount</a>; attribute unsigned long <a href="#currentloop" title= "dom-media-currentLoop">currentLoop</a>; // cue ranges void <a href="#addcuerange" title= "dom-media-addCueRange">addCueRange</a>(in DOMString className, in float start, in float end, in boolean pauseOnExit, in <a href="#voidcallback">VoidCallback</a> enterCallback, in <a href="#voidcallback">VoidCallback</a> exitCallback); void removeCueRanges(in DOMString className); // controls attribute boolean <a href="#controls0" title= "dom-media-controls">controls</a>; attribute float <a href="#volume" title= "dom-media-volume">volume</a>; attribute boolean <a href="#muted" title= "dom-media-muted">muted</a>; }; </pre> The <dfn id="media8">media element attributes</dfn> , <code title="attr-media-src"><a href="#src7">src</a></code> , <code title="attr-media-autoplay"><a href= "#autoplay">autoplay</a></code> , <code title= "attr-media-start"><a href="#start2">start</a></code> , <code title="attr-media-loopstart"><a href= "#loopstart">loopstart</a></code> , <code title= "attr-media-loopend"><a href="#loopend">loopend</a></code> , <code title="attr-media-end"><a href="#end">end</a></code> , <code title="attr-media-playcount"><a href= "#playcount">playcount</a></code> , and <code title= "attr-media-controls"><a href="#controls">controls</a></code> , apply to all <a href="#media7" title="media element">media elements</a> . They are defined in this section. <a href="#media7" title="media element">Media elements</a> are used to present audio data, or video and audio data, to the user. This is referred to as <dfn id="media9">media data</dfn> in this section, since this section applies equally to <a href="#media7" title="media element">media elements</a> for audio or for video. The term <dfn id="media10">media resource</dfn> is used to refer to the complete set of media data, e.g. the complete video file, or complete audio file. <h5 id="error"><del class= "diff-old">3.14.9.1.</del> <ins class= "diff-chg">3.12.10.1.</ins> Error codes</h5> All <a href="#media7" title="media element">media elements</a> have an associated error status, which records the last error the element encountered since the <code title="dom-media-load"><a href= "#load">load()</a></code> method was last invoked. The <dfn id= "error0" title="dom-media-error"><code>error</code></dfn> attribute, on getting, must return the <code><a href= "#mediaerror">MediaError</a></code> object created for this last error, or null if there has not been an error. <pre class="idl"> interface <dfn id="mediaerror">MediaError</dfn> { const unsigned short <a href="#mediaerraborted" title= "dom-MediaError-MEDIA_ERR_ABORTED">MEDIA_ERR_ABORTED</a> = 1; const unsigned short <a href="#mediaerrnetwork" title= "dom-MediaError-MEDIA_ERR_NETWORK">MEDIA_ERR_NETWORK</a> = 2; const unsigned short <a href="#mediaerrdecode" title= "dom-MediaError-MEDIA_ERR_DECODE">MEDIA_ERR_DECODE</a> = 3; readonly attribute unsigned short <a href="#code0" title= "dom-MediaError-code">code</a>; }; </pre> The <dfn id="code0" title= "dom-MediaError-code"><code>code</code></dfn> attribute of a <code><a href="#mediaerror">MediaError</a></code> object must return the code for the error, which must be one of the following: <dl> <dt><dfn id="mediaerraborted" title= "dom-MediaError-MEDIA_ERR_ABORTED"><code>MEDIA_ERR_ABORTED</code></dfn> (numeric value 1)</dt> <dd>The download of the <a href="#media10">media resource</a> was aborted by the user agent at the user's request.</dd> <dt><dfn id="mediaerrnetwork" title= "dom-MediaError-MEDIA_ERR_NETWORK"><code>MEDIA_ERR_NETWORK</code></dfn> (numeric value 2)</dt> <dd>A network error of some description caused the user agent to stop downloading the <a href="#media10">media resource</a> .</dd> <dt><dfn id="mediaerrdecode" title= "dom-MediaError-MEDIA_ERR_DECODE"><code>MEDIA_ERR_DECODE</code></dfn> (numeric value 3)</dt> <dd>An error of some description occurred while decoding the <a href="#media10">media resource</a> .</dd> </dl> <h5 id="location"><del class= "diff-old">3.14.9.2.</del> <ins class= "diff-chg">3.12.10.2.</ins> Location of the media resource</h5> The <dfn id="src7" title="attr-media-src"><code>src</code></dfn> content attribute on <a href="#media7" title="media element">media elements</a> gives the address of the media resource (video, audio) to show. The attribute, if present, must contain a URI (or IRI). If the <code title="attr-media-src"><a href= "#src7">src</a></code> attribute of a <a href="#media7">media element</a> that is already in a document and whose <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> is in the <code title= "dom-media-EMPTY"><a href="#empty">EMPTY</a></code> state is added, changed, or removed, the user agent must implicitly invoke the <code title="dom-media-load"><a href="#load">load()</a></code> method on the <a href="#media7">media element</a> as soon as all other scripts have finished executing. Any exceptions raised must be ignored. If a <code title="attr-media-src"><a href= "#src7">src</a></code> attribute is specified, the resource it specifies is the <a href="#media10">media resource</a> that will be used. Otherwise, the resource specified by the first suitable <code><a href="#source">source</a></code> element child of the <a href="#media7">media element</a> is the one used. The <dfn id="src8" title="dom-media-src"><code>src</code></dfn> DOM attribute on <a href="#media7" title="media element">media elements</a> must <a href="#reflect">reflect</a> the content attribute of the same name. To <dfn id="pick-a">pick a media resource</dfn> for a <a href= "#media7">media element</a> , a user agent must use the following steps: <ol> <li> <ins class="diff-new">Let the</ins> <var title=""><ins class= "diff-new">chosen resource's pixel ratio</ins></var> <ins class= "diff-new">be 1.0.</ins> </li> <li> If the <a href="#media7">media element</a> has a <code title= "attr-media-src"><a href="#src7">src</a></code> , then the address given in that attribute is the address of the <a href= "#media10">media resource</a> ; jump to the last step. </li> <li> Otherwise, let <var title="">candidate</var> be the first <code><a href="#source">source</a></code> element child in the <a href="#media7">media element</a> , or null if there is no such child. </li> <li> <ins class="diff-new">Loop</ins> :<ins class= "diff-new">this is the start of the loop that looks at the</ins> <code><a href="#source"><ins class= "diff-new">source</ins></a></code> <ins class= "diff-new">elements.</ins> </li> <li> <ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">candidate</ins></var> <ins class="diff-new">is not null and it has a</ins> <code title="attr-source-pixelratio"><a href= "#pixelratio"><ins class="diff-new">pixelratio</ins></a></code> <ins class="diff-new">attribute, then let the</ins> <var title= ""><ins class="diff-new">chosen resource's pixel ratio</ins></var> <ins class="diff-new">be result of applying the</ins> <a href= "#rules1"><ins class="diff-new">rules for parsing floating point number values</ins></a> <ins class="diff-new">to the value of that attribute, or 1.0 if those rules return an error.</ins> </li> <li> If either: <ul> <li><var title="">candidate</var> is null, or</li> <li>the <var title="">candidate</var> element has no <code title= "attr-source-src"><a href="#src5">src</a></code> attribute, or</li> <li>the <var title="">candidate</var> element has a <code title= "attr-source-type"><a href="#type8">type</a></code> attribute and that attribute's value, when parsed as a MIME type, does not represent a type that the user agent can render (including any codecs described by the <code title="">codec</code> parameter), or <a href="#references">[RFC2046]</a> <a href= "#references">[RFC4281]</a></li> <li>the <var title="">candidate</var> element has a <code title= "attr-source-media"><a href="#media5">media</a></code> attribute and that attribute's value, when processed according to the rules for <a href="#mq">media <del class="diff-old">queries,</del> <ins class="diff-chg">queries</ins></a> , does not match the current environment, <a href="#references">[MQ]</a></li> </ul> ...then the <var title="">candidate</var> is not suitable; go to the next step. Otherwise, the address given in that <var title= "">candidate</var> element's <code title="attr-source-src"><a href= "#src5">src</a></code> attribute is the address of the <a href= "#media10">media resource</a> ; jump to the last step. </li> <li> Let <var title="">candidate</var> be the next <code><a href= "#source">source</a></code> element child in the <a href= "#media7">media element</a> , or null if there are no more such children. </li> <li> If <var title="">candidate</var> is not null, return to <ins class="diff-new">the</ins> step <del class="diff-old">3.</del> <ins class="diff-chg">labeled</ins> <ins class= "diff-chg">loop</ins> . </li> <li> There is no <a href="#media10">media resource</a> . Abort these steps. </li> <li> Let the address of the <dfn id="chosen">chosen media resource</dfn> be the one that was found before jumping to this <del class="diff-old">step. A source element with no src attribute is assumed to</del> <ins class="diff-chg">step, and let its</ins> <dfn id="pixel0"><ins class="diff-chg">pixel ratio</ins></dfn> be the <del class="diff-old">last source element — any source elements after it are ignored (and are invalid).</del> <ins class= "diff-chg">value of the</ins> <var title=""><ins class= "diff-chg">chosen resource's pixel ratio</ins></var> . </li> </ol> The <dfn id="currentsrc" title= "dom-media-currentSrc"><code>currentSrc</code></dfn> DOM attribute must return the empty string if the <a href="#media7">media element</a> 's <code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> has the value <a href= "#empty" title="dom-media-EMPTY">EMPTY</a> , and the absolute URL of the <a href="#chosen">chosen media resource</a> otherwise. <h5 id="network0"><del class= "diff-old">3.14.9.3.</del> <ins class= "diff-chg">3.12.10.3.</ins> Network states</h5> As <a href="#media7" title="media element">media elements</a> interact with the network, they go through several states. The <dfn id="networkstate" title= "dom-media-networkState"><code>networkState</code></dfn> attribute, on getting, must return the current network state of the element, which must be one of the following values: <dl> <dt><dfn id="empty" title= "dom-media-EMPTY"><code>EMPTY</code></dfn> (numeric value 0)</dt> <dd>The element has not yet been <del class= "diff-old">initialised.</del> <ins class= "diff-chg">initialized.</ins> All attributes are in their initial states.</dd> <dt><dfn id="loading0" title= "dom-media-LOADING"><code>LOADING</code></dfn> (numeric value 1)</dt> <dd>The element has <a href="#pick-a" title= "pick a media resource">picked a media resource</a> (the <a href= "#chosen">chosen media resource</a> is available from the <code title="dom-media-currentSrc"><a href= "#currentsrc">currentSrc</a></code> attribute), but none of the metadata has yet been obtained and therefore all the other attributes are still in their initial states.</dd> <dt><dfn id="loadedmetadata" title= "dom-media-LOADED_METADATA"><code>LOADED_METADATA</code></dfn> (numeric value 2)</dt> <dd>Enough of the resource has been obtained that the metadata attributes are initialized (e.g. the length is known). The API will no longer raise exceptions when used.</dd> <dt><dfn id="loadedfirstframe" title= "dom-media-LOADED_FIRST_FRAME"><code>LOADED_FIRST_FRAME</code></dfn> (numeric value 3)</dt> <dd>Actual <a href="#media9">media data</a> has been obtained. In the case of video, this specifically means that a frame of video is available and can be shown.</dd> <dt><dfn id="loaded" title= "dom-media-LOADED"><code>LOADED</code></dfn> (numeric value 4)</dt> <dd>The entire <a href="#media10">media resource</a> has been obtained and is available to the user agent locally. Network connectivity could be lost without affecting the media playback.</dd> </dl> The algorithm for the <code title="dom-media-load"><a href= "#load">load()</a></code> method defined below describes exactly when the <code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute changes value. <h5 id="loading"><del class= "diff-old">3.14.9.4.</del> <ins class= "diff-chg">3.12.10.4.</ins> Loading the media resource</h5> All <a href="#media7" title="media element">media elements</a> have a <dfn id="begun">begun flag</dfn> , which must begin in the false state, a <dfn id="loaded-first-frame">loaded-first-frame flag</dfn> , which must begin in the false state, and an <dfn id= "autoplaying">autoplaying flag</dfn> , which must begin in the true state. When the <dfn id="load" title= "dom-media-load"><code>load()</code></dfn> method on a <a href= "#media7">media element</a> is invoked, the user agent must run the following steps. Note that this algorithm might get aborted, e.g. if the <code title="dom-media-load"><a href= "#load">load()</a></code> method itself is invoked again. <ol> <li> Any already-running instance of this algorithm for this element must be aborted. If those method calls have not yet returned, they must finish the step they are on, and then immediately return. </li> <li> If the element's <a href="#begun">begun flag</a> is true, then the <a href="#begun">begun flag</a> must be set to false, the <code title="dom-media-error"><a href="#error0">error</a></code> attribute must be set to a new <code><a href= "#mediaerror">MediaError</a></code> object whose <code title= "dom-MediaError-code"><a href="#code0">code</a></code> attribute is set to <code title="dom-MediaError-MEDIA_ERR_ABORTED"><a href= "#mediaerraborted">MEDIA_ERR_ABORTED</a></code> , and the user agent must synchronously <a href="#firing6">fire a progress event</a> called <code title="event-abort"><a href= "#abort">abort</a></code> at the <a href="#media7">media element</a> . </li> <li> The <code title="dom-media-error"><a href= "#error0">error</a></code> attribute must be set to null, the <a href="#loaded-first-frame">loaded-first-frame flag</a> must be set to false, and the <a href="#autoplaying">autoplaying flag</a> must be set to true. </li> <li> The <code title="dom-media-playbackRate"><a href= "#playbackrate">playbackRate</a></code> attribute must be set to the value of the <code title= "dom-media-defaultPlaybackRate"><a href= "#defaultplaybackrate">defaultPlaybackRate</a></code> attribute. </li> <li> If the <a href="#media7">media element</a> 's <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> is not set to <a href= "#empty" title="dom-media-EMPTY">EMPTY</a> , then the following substeps must be followed: <ol> <li>The <code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute must be set to <a href="#empty" title="dom-media-EMPTY">EMPTY</a> .</li> <li>If <code title="dom-media-readyState"><a href= "#readystate0">readyState</a></code> is not set to <code title= "dom-media-DATA_UNAVAILABLE"><a href= "#dataunavailable">DATA_UNAVAILABLE</a></code> , it must be set to that state .</li> <li>If the <code title="dom-media-paused"><a href= "#paused">paused</a></code> attribute is false, it must be set to true .</li> <li>If <code title="dom-media-seeking"><a href= "#seeking0">seeking</a></code> is true, it must be set to false.</li> <li>The <a href="#current0">current playback position</a> must be set to 0.</li> <li>The <code title="dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> DOM attribute must be set to 0.</li> <li>The user agent must synchronously <a href="#firing2">fire a simple event</a> called <code title="event-emptied"><a href= "#emptied">emptied</a></code> at the <a href="#media7">media element</a> .</li> </ol> </li> <li> The user agent must <a href="#pick-a">pick a media resource</a> for the <a href="#media7">media element</a> . If that fails, the method must raise an <code>INVALID_STATE_ERR</code> exception, and abort these steps. </li> <li> The <code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute must be set to <a href="#loading0" title="dom-media-LOADING">LOADING</a> . </li> <li> The <code title="dom-media-currentSrc"><a href= "#currentsrc">currentSrc</a></code> attribute starts returning the new value. </li> <li> The user agent must then set the <a href="#begun">begun flag</a> to true and <a href="#firing6">fire a progress event</a> called <del class="diff-old">begin</del> <code title= "event-loadstart"><a href="#loadstart"><ins class= "diff-chg">loadstart</ins></a></code> at the <a href= "#media7">media element</a> . </li> <li> The method must return, but these steps must continue. </li> <li> Playback of any previously playing <a href= "#media10">media resource</a> for this element stops. </li> <li> If a download is in progress for the <a href="#media7">media element</a> , the user agent should stop the download. </li> <li> The user agent must then begin to download the <a href= "#chosen">chosen media resource</a> . The rate of the download may be throttled, however, in response to user preferences (including throttling it to zero until the user indicates that the download can start), or to balance the download with other connections sharing the same bandwidth. </li> <li> While the download is progressing, the user agent must <a href= "#firing6">fire a progress event</a> called <code title= "event-progress"><a href="#progress0">progress</a></code> at the element every 350ms (±200ms) or for every byte received, whichever is least frequent. If at any point the user agent has received no data for more than about three seconds, the user agent must <a href= "#firing6">fire a progress event</a> called <code title= "event-stalled"><a href="#stalled">stalled</a></code> at the element. User agents may allow users to selectively block or slow <a href="#media9">media data</a> downloads. When a <a href= "#media7">media element</a> 's download has been blocked, the user agent must act as if it was stalled (as opposed to acting as if the connection was closed). The user agent may use whatever means necessary to download the resource (within the constraints put forward by this and other specifications); for example, reconnecting to the server in the face of network errors, using HTTP partial range requests, or switching to a streaming protocol. The user agent must <del class= "diff-old">only</del> consider a resource erroneous <ins class= "diff-new">only</ins> if it has given up trying to download it. <dl class="switch"> <dt>If the <a href="#media9">media data</a> cannot be downloaded at all, due to network errors, causing the user agent to give up trying to download the resource</dt> <dd> DNS errors and HTTP 4xx and 5xx errors (and equivalents in other protocols) must cause the user agent to execute the following steps. User agents may also follow these steps in response to other network errors of similar severity. <ol> <li>The user agent should cancel the download.</li> <li>The <code title="dom-media-error"><a href= "#error0">error</a></code> attribute must be set to a new <code><a href="#mediaerror">MediaError</a></code> object whose <code title="dom-MediaError-code"><a href="#code0">code</a></code> attribute is set to <code title= "dom-MediaError-MEDIA_ERR_NETWORK"><a href= "#mediaerrnetwork">MEDIA_ERR_NETWORK</a></code> .</li> <li>The <a href="#begun">begun flag</a> must be set to false and the user agent must <a href="#firing6">fire a progress event</a> called <code title="event-error"><a href="#error1">error</a></code> at the <a href="#media7">media element</a> .</li> <li>The element's <code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute must be switched to the <a href="#empty" title="dom-media-EMPTY">EMPTY</a> value and the user agent must <a href="#firing2">fire a simple event</a> called <code title="event-emptied"><a href= "#emptied">emptied</a></code> at the element.</li> <li>These steps must be aborted.</li> </ol> </dd> <dt id="fatal-decode-error">If the <a href="#media9">media data</a> can be downloaded but is in an unsupported format, or can otherwise not be rendered at all</dt> <dd> The server returning a file of the wrong kind (e.g. one that that turns out to not be pure audio when the <a href= "#media7">media element</a> is an <code><a href= "#audio1">audio</a></code> element), or the file using unsupported codecs for all the data, must cause the user agent to execute the following steps. User agents may also execute these steps in response to other codec-related fatal errors, such as the file requiring more resources to process than the user agent can provide in real time. <ol> <li>The user agent should cancel the download.</li> <li>The <code title="dom-media-error"><a href= "#error0">error</a></code> attribute must be set to a new <code><a href="#mediaerror">MediaError</a></code> object whose <code title="dom-MediaError-code"><a href="#code0">code</a></code> attribute is set to <code title= "dom-MediaError-MEDIA_ERR_DECODE"><a href= "#mediaerrdecode">MEDIA_ERR_DECODE</a></code> .</li> <li>The <a href="#begun">begun flag</a> must be set to false and the user agent must <a href="#firing6">fire a progress event</a> called <code title="event-error"><a href="#error1">error</a></code> at the <a href="#media7">media element</a> .</li> <li>The element's <code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute must be switched to the <a href="#empty" title="dom-media-EMPTY">EMPTY</a> value and the user agent must <a href="#firing2">fire a simple event</a> called <code title="event-emptied"><a href= "#emptied">emptied</a></code> at the element.</li> <li>These steps must be aborted.</li> </ol> </dd> <dt>If the <a href="#media9">media data</a> download is aborted by the user</dt> <dd> The download is aborted by the user, e.g. because the user navigated the browsing context to another page, the user agent must execute the following steps. These steps are not followed if the <code title="dom-media-load"><a href="#load">load()</a></code> method itself is reinvoked, as the steps above handle that particular kind of abort. <ol> <li>The user agent should cancel the download.</li> <li>The <code title="dom-media-error"><a href= "#error0">error</a></code> attribute must be set to a new <code><a href="#mediaerror">MediaError</a></code> object whose <code title="dom-MediaError-code"><a href="#code0">code</a></code> attribute is set to <code title= "dom-MediaError-MEDIA_ERR_ABORT">MEDIA_ERR_ABORT</code> .</li> <li>The <a href="#begun">begun flag</a> must be set to false and the user agent must <a href="#firing6">fire a progress event</a> called <code title="event-abort"><a href="#abort">abort</a></code> at the <a href="#media7">media element</a> .</li> <li>If the <a href="#media7">media element</a> 's <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute has the value <code title="dom-media-LOADING"><a href= "#loading0">LOADING</a></code> , the element's <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute must be switched to the <a href="#empty" title="dom-media-EMPTY">EMPTY</a> value and the user agent must <a href="#firing2">fire a simple event</a> called <code title="event-emptied"><a href= "#emptied">emptied</a></code> at the element. (If the <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute has a value greater than <code title="dom-media-LOADING"><a href= "#loading0">LOADING</a></code> , then this doesn't happen; the available data, if any, will be playable.)</li> <li>These steps must be aborted.</li> </ol> </dd> <dt id="non-fatal-media-error">If the <a href="#media9">media data</a> can be downloaded but has non-fatal errors or uses, in part, codecs that are unsupported, preventing the user agent from rendering the content completely correctly but not preventing playback altogether</dt> <dd> The server returning data that is partially usable but cannot be optimally rendered must cause the user agent to execute the following steps. <ol> <li class="big-issue">Should we fire a 'warning' event? Set the 'error' flag to 'MEDIA_ERR_SUBOPTIMAL' or something?</li> </ol> </dd> <dt>Once enough of the <a href="#media9">media data</a> has been downloaded to determine the duration of the <a href= "#media10">media resource</a> , its dimensions, and other metadata</dt> <dd> The user agent must follow these substeps: <ol> <li> The <a href="#current0">current playback position</a> must be set to the <var><a href="#effective">effective start</a></var> . </li> <li> The <code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute must be set to <code title="dom-media-LOADED_METADATA"><a href= "#loadedmetadata">LOADED_METADATA</a></code> . </li> <li> A number of attributes, including <code title= "dom-media-duration"><a href="#duration">duration</a></code> , <code title="dom-media-buffered"><a href= "#buffered">buffered</a></code> , and <code title= "dom-media-played"><a href="#played">played</a></code> , become available. </li> <li> The user agent will <a href="#firing2">fire a simple event</a> called <code title="event-durationchange"><a href= "#durationchange">durationchange</a></code> at the element at this point. </li> <li> The user agent must <a href="#firing2">fire a simple event</a> called <code title="event-loadedmetadata"><a href= "#loadedmetadata0">loadedmetadata</a></code> at the element. </li> </ol> </dd> <dt id="handling-first-frame-available">Once enough of the <a href= "#media9">media data</a> has been downloaded to enable the user agent to display the frame at the <a href="#effective">effective start</a> of the <a href="#media10">media resource</a></dt> <dd> The user agent must follow these substeps: <ol> <li> The <code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute must be set to <code title="dom-media-LOADED_FIRST_FRAME"><a href= "#loadedfirstframe">LOADED_FIRST_FRAME</a></code> . </li> <li> The <code title="dom-media-readyState"><a href= "#readystate0">readyState</a></code> attribute must change to <code title="dom-media-CAN_SHOW_CURRENT_FRAME"><a href= "#canshowcurrentframe">CAN_SHOW_CURRENT_FRAME</a></code> . </li> <li> The <a href="#loaded-first-frame">loaded-first-frame flag</a> must be set to true. </li> <li> The user agent must <a href="#firing2">fire a simple event</a> called <code title="event-loadedfirstframe"><a href= "#loadedfirstframe0">loadedfirstframe</a></code> at the element. </li> <li> The user agent must <a href="#firing2">fire a simple event</a> called <code title="event-canshowcurrentframe"><a href= "#canshowcurrentframe0">canshowcurrentframe</a></code> at the element. </li> </ol> </dd> </dl> When the user agent has completed the download of the entire <a href="#media10">media resource</a> , it must move on to the next step. </li> <li> If the download completes without errors, the <a href= "#begun">begun flag</a> must be set to false, the <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute must be set to <code title="dom-media-LOADED"><a href="#loaded">LOADED</a></code> , and the user agent must <a href="#firing6">fire a progress event</a> called <code title="event-load"><a href= "#load0">load</a></code> at the element. </li> </ol> If a <a href="#media7">media element</a> whose <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> has the value <code title= "dom-media-EMPTY"><a href="#empty">EMPTY</a></code> is inserted into a document, user agents must implicitly invoke the <code title="dom-media-load"><a href="#load">load()</a></code> method on the <a href="#media7">media element</a> as soon as all other scripts have finished executing. Any exceptions raised must be ignored. The <dfn id="bufferingrate" title= "dom-media-bufferingRate"><code>bufferingRate</code></dfn> attribute must return the average number of bits received per second for the current download over the past few seconds. If there is no download in progress, the attribute must return 0. The <dfn id="bufferingthrottled" title= "dom-media-bufferingThrottled"><code><ins class= "diff-new">bufferingThrottled</ins></code></dfn> <ins class= "diff-new">attribute must return true if the user agent is intentionally throttling the bandwidth used by the download (including when throttling to zero to pause the download altogether), and false otherwise.</ins> <ins class="diff-new">The</ins> <dfn id="buffered" title= "dom-media-buffered"><code>buffered</code></dfn> attribute must return a static <del class="diff-old">normalised</del> <a href= "#normalized"><ins class="diff-chg">normalized</ins> <code>TimeRanges</code> object</a> that represents the ranges of the <a href="#media10">media resource</a> , if any, that the user agent has downloaded, at the time the attribute is evaluated. Typically this will be a single range anchored at the zero point, but if, e.g. the user agent uses HTTP range requests in response to seeking, then there could be multiple ranges. <ins class="diff-new">The</ins> <dfn id="bufferedbytes" title= "dom-media-bufferedBytes"><code><ins class= "diff-new">bufferedBytes</ins></code></dfn> <ins class= "diff-new">attribute must return a static</ins> <a href= "#normalized0"><ins class="diff-new">normalized</ins> <code><ins class="diff-new">ByteRanges</ins></code> <ins class= "diff-new">object</ins></a> <ins class="diff-new">that represents the ranges of the</ins> <a href="#media10"><ins class= "diff-new">media resource</ins></a> ,<ins class="diff-new">if any, that the user agent has downloaded, at the time the attribute is evaluated.</ins> <ins class="diff-new">The</ins> <dfn id="totalbytes" title= "dom-media-totalBytes"><code><ins class= "diff-new">totalBytes</ins></code></dfn> <ins class= "diff-new">attribute must return the length of the</ins> <a href= "#media10"><ins class="diff-new">media resource</ins></a> ,<ins class="diff-new">in bytes, if it is known and finite. If it is not known, is infinite (e.g. streaming radio), or if no</ins> <a href="#media9"><ins class="diff-new">media data</ins></a> <ins class="diff-new">is available, the attribute must return 0.</ins> <h5 id="offsets"><del class= "diff-old">3.14.9.5.</del> <ins class= "diff-chg">3.12.10.5.</ins> Offsets into the media resource</h5> The <dfn id="duration" title= "dom-media-duration"><code>duration</code></dfn> attribute must return the length of the <a href="#media10">media resource</a> , in seconds. If no <a href="#media9">media data</a> is available, then the attributes must return 0. If <a href="#media9">media data</a> is available but the length is not known, the attribute must return the Not-a-Number (NaN) value. If the <a href="#media10">media resource</a> is known to be unbounded (e.g. a streaming radio), then the attribute must return the positive Infinity value. When the length of the <a href="#media10">media resource</a> changes (e.g. from being unknown to known, or from indeterminate to known, or from a previously established length to a new length) the user agent must, once any running scripts have finished, <a href= "#firing2">fire a simple event</a> called <code title= "event-durationchange"><a href= "#durationchange">durationchange</a></code> at the <a href= "#media7">media element</a> . <a href="#media7" title="media element">Media elements</a> have a <dfn id="current0">current playback position</dfn> , which must initially be zero. The current position is a time. The <dfn id="currenttime" title= "dom-media-currentTime"><code>currentTime</code></dfn> attribute must, on getting, return the <a href="#current0">current playback position</a> , expressed in seconds. On setting, the user agent must <a href="#seek" title="dom-media-seek">seek</a> to the new value (which might raise an exception). The <dfn id="start2" title= "attr-media-start"><code>start</code></dfn> content attribute gives the offset into the <a href="#media10">media resource</a> at which playback is to begin. The default value is the default start position of the <a href="#media10">media resource</a> , or 0 if not enough <a href="#media9">media data</a> has been obtained yet to determine the default start position or if the resource doesn't specify a default start position. The <dfn id="effective"><var>effective start</var></dfn> is the smaller of the <code title="dom-media-start"><a href= "#start3">start</a></code> DOM attribute and the end of the <a href="#media10">media resource</a> . The <dfn id="loopstart" title= "attr-media-loopstart"><code>loopstart</code></dfn> content attribute gives the offset into the <a href="#media10">media resource</a> at which playback is to begin when looping a clip. The default value of the <code title="attr-media-loopStart"><a href= "#loopstart">loopstart</a></code> content attribute is the value of the <code title="dom-media-start"><a href= "#start3">start</a></code> DOM attribute. The <dfn id="effective0"><var>effective loop start</var></dfn> is the smaller of the <code title="dom-media-loopStart"><a href= "#loopstart0">loopStart</a></code> DOM attribute and the end of the <a href="#media10">media resource</a> . The <dfn id="loopend" title= "attr-media-loopend"><code>loopend</code></dfn> content attribute gives an offset into the <a href="#media10">media resource</a> at which playback is to jump back to the <code title= "attr-media-loopstart"><a href="#loopstart">loopstart</a></code> , when looping the clip. The default value of the <code title= "attr-media-loopEnd"><a href="#loopend">loopend</a></code> content attribute is the value of the <code title="dom-media-end"><a href= "#end0">end</a></code> DOM attribute. The <dfn id="effective1"><var>effective loop end</var></dfn> is the greater of the <code title="dom-media-start"><a href= "#start3">start</a></code> , <code title= "dom-media-loopStart"><a href="#loopstart0">loopStart</a></code> , and <code title="dom-media-loopEnd"><a href= "#loopend0">loopEnd</a></code> DOM attributes, except if that is greater than the end of the <a href="#media10">media resource</a> , in which case that's its value. The <dfn id="end" title="attr-media-end"><code>end</code></dfn> content attribute gives an offset into the <a href="#media10">media resource</a> at which playback is to end. The default value is infinity. The <dfn id="effective2"><var>effective end</var></dfn> is the greater of the <code title="dom-media-start"><a href= "#start3">start</a></code> , <code title= "dom-media-loopStart"><a href="#loopstart0">loopStart</a></code> , and <code title="dom-media-loopEnd"><a href= "#loopend0">end</a></code> DOM attributes, except if that is greater than the end of the <a href="#media10">media resource</a> , in which case that's its value. The <code title="attr-media-start"><a href= "#start2">start</a></code> , <code title= "attr-media-loopstart"><a href="#loopstart">loopstart</a></code> , <code title="attr-media-loopend"><a href= "#loopend">loopend</a></code> , and <code title= "attr-media-end"><a href="#end">end</a></code> attributes must, if specified, contain value time offsets . To get the time values they represent, user agents must use the <a href="#rules4">rules for parsing time offsets</a> . The <dfn id="start3" title= "dom-media-start"><code>start</code></dfn> , <dfn id="loopstart0" title="dom-media-loopStart"><code>loopStart</code></dfn> , <dfn id= "loopend0" title="dom-media-loopEnd"><code>loopEnd</code></dfn> , and <dfn id="end0" title="dom-media-end"><code>end</code></dfn> DOM attributes must <a href="#reflect">reflect</a> the <code title= "attr-media-start"><a href="#start2">start</a></code> , <code title="attr-media-loopstart"><a href= "#loopstart">loopstart</a></code> , <code title= "attr-media-loopend"><a href="#loopend">loopend</a></code> , and <code title="attr-media-end"><a href="#end">end</a></code> content attributes on the <a href="#media7">media element</a> respectively. The <dfn id="playcount" title= "attr-media-playcount"><code>playcount</code></dfn> content attribute gives the number of times to play the clip. The default value is 1. The <dfn id="playcount0" title= "dom-media-playCount"><code>playCount</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the <code title= "attr-media-playcount"><a href="#playcount">playcount</a></code> content attribute on the <a href="#media7">media element</a> . The value must be <a href="#limited1">limited to only positive non-zero numbers</a> . The <dfn id="currentloop" title= "dom-media-currentLoop"><code>currentLoop</code></dfn> attribute must initially have the value 0. It gives the index of the current loop. It is changed during playback as described below. When any of the <code title="dom-media-start"><a href= "#start3">start</a></code> , <code title= "dom-media-loopStart"><a href="#loopstart0">loopStart</a></code> , <code title="dom-media-loopEnd"><a href= "#loopend0">loopEnd</a></code> , <code title= "dom-media-end"><a href="#end0">end</a></code> , and <code title= "dom-media-playCount"><a href="#playcount0">playCount</a></code> DOM attributes change value (either through content attribute mutations reflecting into the DOM attribute, or direct mutations of the DOM attribute), the user agent must apply the following steps: <ol> <li> If the <code title="dom-media-playCount"><a href= "#playcount0">playCount</a></code> DOM attribute's value is less than or equal to the <code title="dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> DOM attribute's value, then the <code title="dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> DOM attribute's value must be set to <code title="dom-media-playCount"><a href= "#playcount0">playCount</a></code> -1 (which will make the current loop the last loop). </li> <li> If the <a href="#media7">media element</a> 's <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> is in the <code title= "dom-media-EMPTY"><a href="#empty">EMPTY</a></code> state or the <code title="dom-media-LOADING"><a href= "#loading0">LOADING</a></code> state, then the user agent must at this point abort these steps. </li> <li> If the <code title="dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> is zero, and the <a href= "#current0">current playback position</a> is before the <var><a href="#effective">effective start</a></var> , the user agent must <a href="#seek" title="dom-media-seek">seek</a> to the <var><a href="#effective">effective start</a></var> . </li> <li> If the <code title="dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> is greater than zero, and the <a href="#current0">current playback position</a> is before the <var><a href="#effective0">effective loop start</a></var> , the user agent must <a href="#seek" title="dom-media-seek">seek</a> to the <var><a href="#effective0">effective loop start</a></var> . </li> <li> If the <code title="dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> is less than <code title="dom-media-playCount"><a href= "#playcount0">playCount</a></code> -1 , and the <a href= "#current0">current playback position</a> is after the <var><a href="#effective1">effective loop end</a></var> , the user agent must <a href="#seek" title="dom-media-seek">seek</a> to the <var><a href="#effective0">effective loop start</a></var> , and increase <code title="dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> by 1. </li> <li> If the <code title="dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> is equal to <code title="dom-media-playCount"><a href= "#playcount0">playCount</a></code> -1 , and the <a href= "#current0">current playback position</a> is after the <var><a href="#effective2">effective end</a></var> , the user agent must <a href="#seek" title="dom-media-seek">seek</a> to the <var><a href="#effective2">effective end</a></var> and then the looping will end. </li> </ol> <h5 id="the-ready"><del class= "diff-old">3.14.9.6.</del> <ins class= "diff-chg">3.12.10.6.</ins> The ready states</h5> <a href="#media7" title="media element">Media elements</a> have a ready state , which describes to what degree they are ready to be rendered at the <a href="#current0">current playback position</a> . The possible values are as follows; the ready state of a media element at any particular time is the greatest value describing the state of the element: <dl> <dt><dfn id="dataunavailable" title= "dom-media-DATA_UNAVAILABLE"><code>DATA_UNAVAILABLE</code></dfn> (numeric value 0)</dt> <dd>No data for the <a href="#current0">current playback position</a> is available. <a href="#media7" title= "media element">Media elements</a> whose <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute is less than <code title="dom-media-LOADED_FIRST_FRAME"><a href= "#loadedfirstframe">LOADED_FIRST_FRAME</a></code> are always in the <code title="dom-media-DATA_UNAVAILABLE"><a href= "#dataunavailable">DATA_UNAVAILABLE</a></code> state.</dd> <dt><dfn id="canshowcurrentframe" title= "dom-media-CAN_SHOW_CURRENT_FRAME"><code>CAN_SHOW_CURRENT_FRAME</code></dfn> (numeric value 1)</dt> <dd>Data for the immediate <a href="#current0">current playback position</a> is available, but not enough data is available that the user agent could successfully advance the <a href= "#current0">current playback position</a> at all without immediately reverting to the <code title= "dom-media-DATA_UNAVAILABLE"><a href= "#dataunavailable">DATA_UNAVAILABLE</a></code> state. In video, this corresponds to the user agent having data from the current frame, but not the next frame. In audio, this corresponds to the user agent only having audio up to the <a href="#current0">current playback position</a> , but no further.</dd> <dt><dfn id="canplay" title= "dom-media-CAN_PLAY"><code>CAN_PLAY</code></dfn> (numeric value 2)</dt> <dd>Data for the immediate <a href="#current0">current playback position</a> is available, as well as enough data for the user agent to advance the <a href="#current0">current playback position</a> at least a little without immediately reverting to the <code title="dom-media-DATA_UNAVAILABLE"><a href= "#dataunavailable">DATA_UNAVAILABLE</a></code> state. In video, this corresponds to the user agent having data for the current frame and the next frame. In audio, this corresponds <del class= "diff-old">ot</del> <ins class="diff-chg">to</ins> the user agent having data beyond the <a href="#current0">current playback position</a> .</dd> <dt><dfn id="canplaythrough" title= "dom-media-CAN_PLAY_THROUGH"><code>CAN_PLAY_THROUGH</code></dfn> (numeric value 3)</dt> <dd>Data for the immediate <a href="#current0">current playback position</a> is available, as well as enough data for the user agent to advance the <a href="#current0">current playback position</a> at least a little without immediately reverting to the <code title="dom-media-DATA_UNAVAILABLE"><a href= "#dataunavailable">DATA_UNAVAILABLE</a></code> state, and, in addition, the user agent estimates that data is being downloaded at a rate where the <a href="#current0">current playback position</a> , if it were to advance at the rate given by the <code title= "dom-media-defaultPlaybackRate"><a href= "#defaultplaybackrate">defaultPlaybackRate</a></code> attribute, would not overtake the available data before playback reaches the <a href="#effective2">effective end</a> of the <a href= "#media10">media resource</a> on the last <a href="#playcount0" title="dom-media-playCount">loop</a> .</dd> </dl> When the ready state of a <a href="#media7">media element</a> whose <code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> is not <code title= "dom-media-EMPTY"><a href="#empty">EMPTY</a></code> changes, the user agent must follow the steps given below: <dl class="switch"> <dt>If the new ready state is <code title= "dom-media-DATA_UNAVAILABLE"><a href= "#dataunavailable">DATA_UNAVAILABLE</a></code></dt> <dd> The user agent must <a href="#firing2">fire a simple event</a> called <code title="event-dataunavailable"><a href= "#dataunavailable0">dataunavailable</a></code> at the element. </dd> <dt>If the new ready state is <code title= "dom-media-CAN_SHOW_CURRENT_FRAME"><a href= "#canshowcurrentframe">CAN_SHOW_CURRENT_FRAME</a></code></dt> <dd> If the element's <a href= "#loaded-first-frame">loaded-first-frame flag</a> is true, the user agent must <a href="#firing2">fire a simple event</a> called <code title="event-canshowcurrentframe"><a href= "#canshowcurrentframe0">canshowcurrentframe</a></code> event. The first time the <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute switches to this value, the <a href="#loaded-first-frame">loaded-first-frame flag</a> is false, and the event is fired <a href= "#handling-first-frame-available">by the algorithm described above</a> for the <code title="dom-media-load"><a href= "#load">load()</a></code> method, in conjunction with other steps. </dd> <dt>If the new ready state is <code title= "dom-media-CAN_PLAY"><a href="#canplay">CAN_PLAY</a></code></dt> <dd> The user agent must <a href="#firing2">fire a simple event</a> called <code title="event-canplay"><a href= "#canplay0">canplay</a></code> . </dd> <dt>If the new ready state is <code title= "dom-media-CAN_PLAY_THROUGH"><a href= "#canplaythrough">CAN_PLAY_THROUGH</a></code></dt> <dd> The user agent must <a href="#firing2">fire a simple event</a> called <code title="event-canplaythrough"><a href= "#canplaythrough0">canplaythrough</a></code> event. If the <a href= "#autoplaying">autoplaying flag</a> is true, and the <code title= "dom-media-paused"><a href="#paused">paused</a></code> attribute is true, and the <a href="#media7">media element</a> has an <code title="attr-media-autoplay"><a href= "#autoplay">autoplay</a></code> attribute specified, then the user agent must also set the <code title="dom-media-paused"><a href= "#paused">paused</a></code> attribute to false and <a href= "#firing2">fire a simple event</a> called <code title= "event-play"><a href="#play0">play</a></code> . </dd> </dl> It is possible for the ready state of a media element to jump between these states discontinuously. For example, the state of a media element whose leaded-first-frame flag is false can jump straight from <code title= "dom-media-DATA_UNAVAILABLE"><a href= "#dataunavailable">DATA_UNAVAILABLE</a></code> to <code title= "dom-media-CAN_PLAY_THROUGH"><a href= "#canplaythrough">CAN_PLAY_THROUGH</a></code> without passing through the <code title="dom-media-CAN_SHOW_CURRENT_FRAME"><a href= "#canshowcurrentframe">CAN_SHOW_CURRENT_FRAME</a></code> and <code title="dom-media-CAN_PLAY"><a href= "#canplay">CAN_PLAY</a></code> states, and thus without firing the <code title="event-canshowcurrentframe"><a href= "#canshowcurrentframe0">canshowcurrentframe</a></code> and <code title="event-canplay"><a href="#canplay0">canplay</a></code> events. The only state that is <del class= "diff-old">guarenteed</del> <ins class="diff-chg">guaranteed</ins> to be reached is the <code title= "dom-media-CAN_SHOW_CURRENT_FRAME"><a href= "#canshowcurrentframe">CAN_SHOW_CURRENT_FRAME</a></code> state, which is reached as part of the <code title= "dom-media-load"><a href="#load">load()</a></code> method's processing. The <dfn id="readystate0" title= "dom-media-readyState"><code>readyState</code></dfn> DOM attribute must, on getting, return the value described above that describes the current ready state of the <a href="#media7">media element</a> . The <dfn id="autoplay" title= "attr-media-autoplay"><code>autoplay</code></dfn> attribute is a <a href="#boolean0">boolean attribute</a> . When present, the algorithm described herein will cause the user agent to automatically begin playback of the <a href="#media10">media resource</a> as soon as it can do so without stopping. The <dfn id="autoplay0" title= "dom-media-autoplay"><code>autoplay</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the content attribute of the same name. <h5 id="playing"><del class= "diff-old">3.14.9.7.</del> <ins class= "diff-chg">3.12.10.7.</ins> Playing the media resource</h5> The <dfn id="paused" title= "dom-media-paused"><code>paused</code></dfn> attribute represents whether the <a href="#media7">media element</a> is paused or not. The attribute must initially be true. A <a href="#media7">media element</a> is said to be <dfn id= "actively">actively playing</dfn> when its <code title= "dom-media-paused"><a href="#paused">paused</a></code> attribute is false, the <code title="dom-media-readyState"><a href= "#readystate0">readyState</a></code> attribute is either <code title="dom-media-CAN_PLAY"><a href= "#canplay">CAN_PLAY</a></code> or <code title= "dom-media-CAN_PLAY_THROUGH"><a href= "#canplaythrough">CAN_PLAY_THROUGH</a></code> , the element has not <a href="#ended">ended playback</a> , playback has not <a href= "#stopped">stopped due to errors</a> , and the element has not <a href="#paused0">paused for user interaction</a> . A <a href="#media7">media element</a> is said to have <dfn id= "ended">ended playback</dfn> when the element's <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute is <code title= "dom-media-LOADED_METADATA"><a href= "#loadedmetadata">LOADED_METADATA</a></code> or greater, the <a href="#current0">current playback position</a> is equal to the <var><a href="#effective2">effective end</a></var> of the <a href= "#media10">media resource</a> , and the <code title= "dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> attribute is equal to <code title="dom-media-playCount"><a href= "#playcount0">playCount</a></code> -1 . A <a href="#media7">media element</a> is said to have <dfn id= "stopped">stopped due to errors</dfn> when the element's <code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute is <code title= "dom-media-LOADED_METADATA"><a href= "#loadedmetadata">LOADED_METADATA</a></code> or greater, and the user agent <a href="#non-fatal-media-error">encounters a non-fatal error</a> during the processing of the <a href="#media9">media data</a> , and due to that error, is not able to play the content at the <a href="#current0">current playback position</a> . A <a href="#media7">media element</a> is said to have <dfn id= "paused0">paused for user interaction</dfn> when its <code title= "dom-media-paused"><a href="#paused">paused</a></code> attribute is false, the <code title="dom-media-readyState"><a href= "#readystate0">readyState</a></code> attribute is either <code title="dom-media-CAN_PLAY"><a href= "#canplay">CAN_PLAY</a></code> or <code title= "dom-media-CAN_PLAY_THROUGH"><a href= "#canplaythrough">CAN_PLAY_THROUGH</a></code> and the user agent has reached a point in the <a href="#media10">media resource</a> where the user has to make a selection for the resource to continue. It is possible for a <a href="#media7">media element</a> to have both <a href="#ended">ended playback</a> and <a href= "#paused0">paused for user interaction</a> at the same time. When a <a href="#media7">media element</a> is <a href="#actively">actively playing</a> and its owner <code>Document</code> is an <a href="#active">active document</a> , its <a href= "#current0">current playback position</a> must increase monotonically at <code title="dom-media-playbackRate"><a href= "#playbackrate">playbackRate</a></code> units of media time per unit time of wall clock time. If this value is not 1, the user agent may apply pitch adjustments to any audio component of the <a href="#media10">media resource</a> . <a href="#media10" title="media resource">Media resources</a> might be internally scripted or interactive. Thus, a <a href= "#media7">media element</a> could play in a non-linear fashion. If this happens, the user agent must act as if the algorithm for <a href="#seek" title="dom-media-seek">seeking</a> was used whenever the <a href="#current0">current playback position</a> changes in a discontinuous fashion (so that the relevant events fire). When a <a href="#media7">media element</a> that is <a href="#actively">actively playing</a> stops playing because its <code title="dom-media-readyState"><a href= "#readystate0">readyState</a></code> attribute changes to a value lower than <code title="dom-media-CAN_PLAY"><a href= "#canplay">CAN_PLAY</a></code> , without the element having <a href="#ended">ended playback</a> , or playback having <a href= "#stopped">stopped due to errors</a> , or playback having <a href= "#paused0">paused for user interaction</a> , <ins class= "diff-new">or the</ins> <a href="#seek" title= "dom-media-seek"><ins class="diff-new">seeking algorithm</ins></a> <ins class="diff-new">being invoked,</ins> the user agent must <a href="#firing2">fire a simple event</a> called <code title= "event-timeupdate"><a href="#timeupdate">timeupdate</a></code> at the element, and then must <a href="#firing2">fire a simple event</a> called <code title="event-waiting"><a href= "#waiting">waiting</a></code> at the element. When a <a href="#media7">media element</a> that is <a href= "#actively">actively playing</a> stops playing because it has <a href="#paused0">paused for user interaction</a> , the user agent must <a href="#firing2">fire a simple event</a> called <code title= "event-timeupdate"><a href="#timeupdate">timeupdate</a></code> at the element. When <code title="dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> is less than <code title="dom-media-playCount"><a href= "#playcount0">playCount</a></code> -1 and the <a href= "#current0">current playback position</a> reaches the <var><a href= "#effective1">effective loop end</a></var> , then the user agent must <a href="#seek" title="dom-media-seek">seek</a> to the <var><a href="#effective0">effective loop start</a></var> , increase <code title="dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> by 1, and <a href= "#firing2">fire a simple event</a> called <code title= "event-timeupdate"><a href="#timeupdate">timeupdate</a></code> . When <code title="dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> is equal to the <code title="dom-media-playCount"><a href= "#playcount0">playCount</a></code> -1 and the <a href= "#current0">current playback position</a> reaches the <var><a href= "#effective2">effective end</a></var> , then the user agent must follow these steps: <ol> <li> The user agent must stop playback. </li> <li> The <code title="dom-media-ended"><a href= "#ended0">ended</a></code> attribute becomes true. </li> <li> The user agent must <a href="#firing2">fire a simple event</a> called <code title="event-timeupdate"><a href= "#timeupdate">timeupdate</a></code> at the element. </li> <li> The user agent must <a href="#firing2">fire a simple event</a> called <code title="event-ended"><a href="#ended1">ended</a></code> at the element. </li> </ol> The <dfn id="defaultplaybackrate" title= "dom-media-defaultPlaybackRate"><code>defaultPlaybackRate</code></dfn> attribute gives the desired speed at which the <a href= "#media10">media resource</a> is to play, as a multiple of its intrinsic speed. The attribute is mutable, but on setting, if the new value is 0.0, a <code>NOT_SUPPORTED_ERR</code> exception must be raised instead of the value being changed. It must initially have the value 1.0. The <dfn id="playbackrate" title= "dom-media-playbackRate"><code>playbackRate</code></dfn> attribute gives the speed at which the <a href="#media10">media resource</a> plays, as a multiple of its intrinsic speed. If it is not equal to the <code title="dom-media-defaultPlaybackRate"><a href= "#defaultplaybackrate">defaultPlaybackRate</a></code> , then the implication is that the user is using a feature such as fast forward or slow motion playback. The attribute is mutable, but on setting, if the new value is 0.0, a <code>NOT_SUPPORTED_ERR</code> exception must be raised instead of the value being changed. Otherwise, the playback must change speed (if the element is <a href="#actively">actively playing</a> ). It must initially have the value 1.0. When the <code title="dom-media-defaultPlaybackRate"><a href= "#defaultplaybackrate">defaultPlaybackRate</a></code> or <code title="dom-media-playbackRate"><a href= "#playbackrate">playbackRate</a></code> attributes change value (either by being set by script or by being changed directly by the user agent, e.g. in response to user control) the user agent must, once any running scripts have finished, <a href="#firing2">fire a simple event</a> called <code title="event-ratechange"><a href= "#ratechange">ratechange</a></code> at the <a href="#media7">media element</a> . When the <dfn id="play" title= "dom-media-play"><code>play()</code></dfn> method on a <a href= "#media7">media element</a> is invoked, the user agent must run the following steps. <ol> <li> If the <a href="#media7">media element</a> 's <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute has the value <a href="#empty" title="dom-media-EMPTY">EMPTY</a> , then the user agent must invoke the <code title="dom-media-load"><a href= "#load">load()</a></code> method and wait for it to return. If that raises an exception, that exception must be reraised by the <code title="dom-media-play"><a href="#play">play()</a></code> method. </li> <li> If the <a href="#ended" title="ended playback">playback has ended</a> , then the user agent must set <code title= "dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> to zero and <a href="#seek" title="dom-media-seek">seek</a> to the <var><a href= "#effective">effective start</a></var> . <ins class="diff-new">If this involved a seek, the user agent will</ins> <a href="#firing2"><ins class="diff-new">fire a simple event</ins></a> <ins class="diff-new">called</ins> <code title="event-timeupdate"><a href="#timeupdate"><ins class= "diff-new">timeupdate</ins></a></code> <ins class="diff-new">at the</ins> <a href="#media7"><ins class="diff-new">media element</ins></a> . </li> <li> The <code title="dom-media-playbackRate"><a href= "#playbackrate">playbackRate</a></code> attribute must be set to the value of the <code title= "dom-media-defaultPlaybackRate"><a href= "#defaultplaybackrate">defaultPlaybackRate</a></code> attribute. <ins class="diff-new">If this caused the</ins> <code title="dom-media-playbackRate"><a href= "#playbackrate"><ins class="diff-new">playbackRate</ins></a></code> <ins class="diff-new">attribute to change value, the user agent will</ins> <a href="#firing2"><ins class="diff-new">fire a simple event</ins></a> <ins class="diff-new">called</ins> <code title= "event-ratechange"><a href="#ratechange"><ins class= "diff-new">ratechange</ins></a></code> <ins class="diff-new">at the</ins> <a href="#media7"><ins class="diff-new">media element</ins></a> . </li> <li> If the <a href="#media7">media element</a> 's <code title= "dom-media-paused"><a href="#paused">paused</a></code> attribute is true, it must be set to false. </li> <li> The <a href="#media7">media element</a> 's <a href= "#autoplaying">autoplaying flag</a> must be set to false. </li> <li> The method must then return. <del class="diff-old">If the second step above involved a seek, the user agent will fire a simple event called timeupdate at the media element . If the third step above caused the playbackRate attribute to change value, the user agent will fire a simple event called ratechange at the media element .</del> </li> <li> If the fourth step above changed the value of <code title= "dom-media-paused"><a href="#paused">paused</a></code> , the user agent <del class="diff-old">must</del> <ins class="diff-chg">must, after any running scripts have finished executing, and after any other events triggered by this algorithm (specifically</ins> <code title="event-timeupdate"><a href="#timeupdate"><ins class= "diff-chg">timeupdate</ins></a></code> <ins class= "diff-chg">and</ins> <code title="event-ratechange"><a href= "#ratechange"><ins class="diff-chg">ratechange</ins></a></code> <ins class="diff-chg">) have fired,</ins> <a href="#firing2">fire a simple event</a> called <code title="event-pause"><a href= "#pause1">play</a></code> at the <del class="diff-old">media element .</del> <ins class="diff-chg">element.</ins> </li> </ol> When the <dfn id="pause0" title= "dom-media-pause"><code>pause()</code></dfn> method is invoked, the user agent must run the following steps: <ol> <li> If the <a href="#media7">media element</a> 's <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> attribute has the value <a href="#empty" title="dom-media-EMPTY">EMPTY</a> , then the user agent must invoke the <code title="dom-media-load"><a href= "#load">load()</a></code> method and wait for it to return. If that raises an exception, that exception must be reraised by the <code title="dom-media-play"><a href="#play">pause()</a></code> method. </li> <li> If the <a href="#media7">media element</a> 's <code title= "dom-media-paused"><a href="#paused">paused</a></code> attribute is false, it must be set to true. </li> <li> The <a href="#media7">media element</a> 's <a href= "#autoplaying">autoplaying flag</a> must be set to false. </li> <li> The method must then return. </li> <li> If the second step above changed the value of <code title= "dom-media-paused"><a href="#paused">paused</a></code> , <ins class="diff-new">then, after any running scripts have finished executing,</ins> the user agent must first <a href="#firing2">fire a simple event</a> called <code title="event-timeupdate"><a href= "#timeupdate">timeupdate</a></code> at the element, and then <a href="#firing2">fire a simple event</a> called <code title= "event-pause"><a href="#pause1">pause</a></code> at the element. </li> </ol> When a <a href="#media7">media element</a> is removed from a <code>Document</code> , <ins class="diff-new">if the</ins> <a href="#media7"><ins class="diff-new">media element</ins></a> <ins class="diff-new">'s</ins> <code title= "dom-media-networkState"><a href="#networkstate"><ins class= "diff-new">networkState</ins></a></code> <ins class= "diff-new">attribute has a value other than</ins> <a href="#empty" title="dom-media-EMPTY"><ins class="diff-new">EMPTY</ins></a> <ins class="diff-new">then</ins> the user agent must act as if the <code title="dom-media-pause"><a href="#pause0">pause()</a></code> method had been invoked. <a href="#media7" title="media element">Media elements</a> that are <a href="#actively">actively playing</a> while not in a <code>Document</code> must not play any video, but should play any audio component. Media elements must not stop playing just because all references to them have been removed; only once a media element to which no references exist has reached a point where no further audio remains to be played for that element (e.g. because the element is paused or because the end of the clip has been reached) may the element be garbage collected . If the <a href="#media7">media element</a> 's <code title="dom-ownerDocument">ownerDocument</code> stops being an active document, then the playback will <a href= "#media-playback">stop</a> until the document is active again. The <dfn id="ended0" title= "dom-media-ended"><code>ended</code></dfn> attribute must return true if the <a href="#media7">media element</a> has <a href= "#ended">ended playback</a> , and false otherwise. The <dfn id="played" title= "dom-media-played"><code>played</code></dfn> attribute must return a static <del class="diff-old">normalised</del> <a href= "#normalized"><ins class="diff-chg">normalized</ins> <code>TimeRanges</code> object</a> that represents the ranges of the <a href="#media10">media resource</a> , if any, that the user agent has so far rendered, at the time the attribute is evaluated. <h5 id="seeking"><del class= "diff-old">3.14.9.8.</del> <ins class= "diff-chg">3.12.10.8.</ins> Seeking</h5> The <dfn id="seeking0" title= "dom-media-seeking"><code>seeking</code></dfn> attribute must initially have the value false. When the user agent is required to <dfn id="seek" title= "dom-media-seek">seek</dfn> to a particular <var title="">new playback position</var> in the <a href="#media10">media resource</a> , it means that the user agent must run the following steps: <ol> <li> If the <a href="#media7">media element</a> 's <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> is less than <code title= "dom-media-LOADED_METADATA"><a href= "#loadedmetadata">LOADED_METADATA</a></code> , then the user agent must raise an <code>INVALID_STATE_ERR</code> exception (if the seek was in response to a DOM method call or setting of a DOM attribute), and abort these steps. </li> <li> If <code title="dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> is 0, let <var title= "">min</var> be the <var><a href="#effective">effective start</a></var> . Otherwise, let it be the <var><a href= "#effective0">effective loop start</a></var> . </li> <li> If <code title="dom-media-currentLoop"><a href= "#currentloop">currentLoop</a></code> is equal to <del class= "diff-old">the value of</del> <code title= "dom-media-playCount"><a href="#playcount0">playCount</a> <del class="diff-old">,</del></code> <ins class= "diff-chg">-1</ins> , let <var title="">max</var> be the <var><a href="#effective2">effective end</a></var> . Otherwise, let it be the <var><a href="#effective1">effective loop end</a></var> . </li> <li> If the <var title="">new playback position</var> is more than <var title="">max</var> , let it be <var title="">max</var> . </li> <li> If the <var title="">new playback position</var> is less than <var title="">min</var> , let it be <var title="">min</var> . </li> <li> If the (possibly now changed) <var title="">new playback position</var> is not in one of the ranges given in the <code title="dom-media-seekable"><a href= "#seekable">seekable</a></code> attribute, then the user agent must raise an <code>INDEX_SIZE_ERR</code> exception (if the seek was in response to a DOM method call or setting of a DOM attribute), and abort these steps. </li> <li> The <a href="#current0">current playback position</a> must be set to the given <var title="">new playback position</var> . </li> <li> The <code title="dom-media-seeking"><a href= "#seeking0">seeking</a></code> DOM attribute must be set to true. </li> <li> <ins class="diff-new">If the seek was in response to a DOM method call or setting of a DOM attribute, then continue the script.</ins> The <ins class="diff-new">remainder of these steps must be run asynchronously.</ins> </li> <li> <ins class="diff-new">Once any running scripts have finished executing, the</ins> user agent must <a href="#firing2">fire a simple event</a> called <code title="event-timeupdate"><a href= "#timeupdate">timeupdate</a></code> at the element. </li> <li> <del class="diff-old">As soon as</del> <ins class="diff-chg">If the</ins> <a href="#media7"><ins class="diff-chg">media element</ins></a> <ins class="diff-chg">was</ins> <a href= "#actively"><ins class="diff-chg">actively playing</ins></a> <ins class="diff-chg">immediately before it started seeking, but seeking caused its</ins> <code title= "dom-media-readyState"><a href="#readystate0"><ins class= "diff-chg">readyState</ins></a></code> <ins class= "diff-chg">attribute to change to a value lower than</ins> <code title="dom-media-CAN_PLAY"><a href="#canplay"><ins class= "diff-chg">CAN_PLAY</ins></a></code> ,<ins class="diff-chg">the user agent must</ins> <a href="#firing2"><ins class="diff-chg">fire a simple event</ins></a> <ins class="diff-chg">called</ins> <code title="event-waiting"><a href="#waiting"><ins class= "diff-chg">waiting</ins></a></code> <ins class="diff-chg">at the element.</ins> </li> <li> <ins class="diff-chg">If, when it reaches this step,</ins> the user agent has <ins class="diff-new">still not</ins> established whether or not the <a href="#media9">media data</a> for the <var title="">new playback position</var> is available, and, if it is, decoded enough data to play back that position, the <ins class= "diff-new">user agent must</ins> <a href="#firing2"><ins class= "diff-new">fire a simple event</ins></a> <ins class= "diff-new">called</ins> <code title="event-seeking"><a href= "#seeking1"><ins class="diff-new">seeking</ins></a></code> <ins class="diff-new">at the element.</ins> </li> <li> <ins class="diff-new">The user agent must wait until it has established whether or not the</ins> <a href="#media9"><ins class= "diff-new">media data</ins></a> <ins class="diff-new">for the</ins> <var title=""><ins class="diff-new">new playback position</ins></var> <ins class="diff-new">is available, and, if it is, until it has decoded enough data to play back that position.</ins> </li> <li> <ins class="diff-new">The</ins> <code title= "dom-media-seeking"><a href="#seeking0">seeking</a></code> DOM attribute must be set to false. </li> <li> <ins class="diff-new">Once any running scripts have finished executing, the user agent must</ins> <a href="#firing2"><ins class= "diff-new">fire a simple event</ins></a> <ins class= "diff-new">called</ins> <code title="event-seeked"><a href= "#seeked"><ins class="diff-new">seeked</ins></a></code> <ins class= "diff-new">at the element.</ins> </li> </ol> The <dfn id="seekable" title= "dom-media-seekable"><code>seekable</code></dfn> attribute must return a static <del class="diff-old">normalised</del> <a href= "#normalized"><ins class="diff-chg">normalized</ins> <code>TimeRanges</code> object</a> that represents the ranges of the <a href="#media10">media resource</a> , if any, that the user agent is able to seek to, at the time the attribute is evaluated, notwithstanding the looping attributes (i.e. the <var><a href= "#effective">effective start</a></var> and <var><a href= "#effective2">effective end</a></var> , etc, don't affect the <code title="dom-media-seekable"><a href="#seekable"><del class= "diff-old">seeking</del> <ins class= "diff-chg">seekable</ins></a></code> attribute). If the user agent can seek to anywhere in the <a href="#media10">media resource</a> , e.g. because it a simple movie file and the user agent and the server support HTTP Range requests, then the attribute would return an object with one range, whose start is the time of the first frame (typically zero), and whose end is the same as the time of the first frame plus the <code title="dom-media-duration"><a href= "#duration">duration</a></code> attribute's value (which would equal the time of the last frame). <h5 id="cue-ranges"><del class= "diff-old">3.14.9.9.</del> <ins class= "diff-chg">3.12.10.9.</ins> Cue ranges</h5> <a href="#media7" title="media element">Media elements</a> have a set of <dfn id="cue-ranges0" title="cue range">cue ranges</dfn> . Each cue range is made up of the following information: <dl> <dt>A class name</dt> <dd>A group of related ranges can be given the same class name so that they can all be removed at the same time.</dd> <dt>A start time</dt> <dt>An end time</dt> <dd>The actual time range, using the same timeline as the <a href= "#media10">media resource</a> itself.</dd> <dt>A "pause" boolean</dt> <dd>A flag indicating whether to pause playback on exit.</dd> <dt>An "enter" callback</dt> <dd>A callback that is called when the <a href="#current0">current playback position</a> enters the range.</dd> <dt>An "exit" callback</dt> <dd>A callback that is called when the <a href="#current0">current playback position</a> exits the range.</dd> <dt>An "active" boolean</dt> <dd>A flag indicating whether the range is active or not.</dd> </dl> The <dfn id="addcuerange" title= "dom-media-addCueRange"><code>addCueRange( <var title= "">className</var> , <var title="">start</var> , <var title= "">end</var> , <var title="">pauseOnExit</var> , <var title= "">enterCallback</var> , <var title="">exitCallback</var> )</code></dfn> method must, when called, add a <a href= "#cue-ranges0">cue range</a> to the <a href="#media7">media element</a> , that cue range having the class name <var title= "">className</var> , the start time <var title="">start</var> (in seconds), the end time <var title="">end</var> (in seconds), the "pause" boolean with the same value as <var title= "">pauseOnExit</var> , the "enter" callback <var title= "">enterCallback</var> , the "exit" callback <var title= "">exitCallback</var> , and an "active" boolean that is true if the <a href="#current0">current playback position</a> is equal to or greater than the start time and less than the end time, and false otherwise. The <dfn id="removecueranges" title= "dom-media-removeCueRanges"><code>removeCueRanges( <var title= "">className</var> )</code></dfn> method must, when called, remove all the <a href="#cue-ranges0" title="cue range">cue ranges</a> of the <a href="#media7">media element</a> which have the class name <var title="">className</var> . When the <a href="#current0">current playback position</a> of a <a href="#media7">media element</a> changes (e.g. due to playback or seeking), the user agent must run the following steps. If the <a href="#current0">current playback position</a> changes while the steps are running, then the user agent must wait for the steps to complete, and then must immediately rerun the steps. (These steps are thus run as often as possible or needed — if one iteration takes a long time, this can cause certain ranges to be skipped over as the user agent rushes ahead to "catch up".) <ol> <li> Let <var title="">current ranges</var> be an ordered list of <a href="#cue-ranges0" title="cue range">cue ranges</a> , <del class="diff-old">initialised</del> <ins class= "diff-chg">initialized</ins> to contain all the <a href= "#cue-ranges0" title="cue range">cue ranges</a> of the <a href= "#media7">media element</a> whose start times are less than or equal to the <a href="#current0">current playback position</a> and whose end times are greater than the <a href="#current0">current playback position</a> , in the order they were added to the element. </li> <li> Let <var title="">other ranges</var> be an ordered list of <a href="#cue-ranges0" title="cue range">cue ranges</a> , <del class="diff-old">initialised</del> <ins class= "diff-chg">initialized</ins> to contain all the <a href= "#cue-ranges0" title="cue range">cue ranges</a> of the <a href= "#media7">media element</a> that are not present in <var title= "">current ranges</var> , in the order they were added to the element. </li> <li> If none of the <a href="#cue-ranges0" title="cue range">cue ranges</a> in <var title="">current ranges</var> have their "active" boolean set to "false" (inactive) and none of the <a href= "#cue-ranges0" title="cue range">cue ranges</a> in <var title= "">other ranges</var> have their "active" boolean set to "true" (active), then abort these steps. </li> <li> If the time was reached through the usual monotonic increase of the current playback position during normal playback, the user agent must then <a href="#firing2">fire a simple event</a> called <code title="event-timeupdate"><a href= "#timeupdate">timeupdate</a></code> at the element. (In the other cases, such as explicit seeks, relevant events get fired as part of the overall process of changing the current playback position.) </li> <li> If the time was reached through the usual monotonic increase of the current playback position during normal playback, and there are <a href="#cue-ranges0" title="cue range">cue ranges</a> in <var title="">other ranges</var> that have both their "active" boolean and their "pause" boolean set to "true", then immediately act as if the element's <code title="dom-media-pause"><a href= "#pause0">pause()</a></code> method had been invoked. (In the other cases, such as explicit seeks, playback is not paused by exiting a cue range, even if that cue range has its "pause" boolean set to "true".) </li> <li> Invoke all the non-null "exit" callbacks for all of the <a href= "#cue-ranges0" title="cue range">cue ranges</a> in <var title= "">other ranges</var> that have their "active" boolean set to "true" (active), in list order. </li> <li> Invoke all the non-null "enter" callbacks for all of the <a href="#cue-ranges0" title="cue range">cue ranges</a> in <var title="">current ranges</var> that have their "active" boolean set to "false" (inactive), in list order. </li> <li> Set the "active" boolean of all the <a href="#cue-ranges0" title="cue range">cue ranges</a> in the <var title="">current ranges</var> list to "true" (active), and the "active" boolean of all the <a href="#cue-ranges0" title="cue range">cue ranges</a> in the <var title="">other ranges</var> list to "false" (inactive). </li> </ol> Invoking a callback (an object implementing the <code><a href= "#voidcallback">VoidCallback</a></code> interface) means calling its <code title="dom-VoidCallback-handleEvent"><a href= "#handleevent">handleEvent()</a></code> method. <pre class="idl"> interface <dfn id="voidcallback">VoidCallback</dfn> { void <a href="#handleevent" title= "dom-voidCallback-handleEvent">handleEvent</a>(); }; </pre> The <dfn id="handleevent" title= "dom-voidCallback-handleEvent"><code>handleEvent</code></dfn> method of objects implementing the <code><a href= "#voidcallback">VoidCallback</a></code> interface is the <del class="diff-old">entrypoint</del> <ins class="diff-chg">entry point</ins> for the callback represented by the object. <del class= "diff-old">In the ECMAScript DOM binding, the ECMAScript native Function type must implement the VoidCallback interface such that invoking the handleEvent() method of that interface on the object from another language binding invokes the function itself. In the ECMAScript binding itself, however, the handleEvent() method of the interface is not directly accessible on Function objects. Such functions, when invoked, must be called at the scope of the browsing context .</del> <h5 id="user-interface"><del class= "diff-old">3.14.9.10.</del> <ins class= "diff-chg">3.12.10.10.</ins> User interface</h5> The <dfn id="controls" title= "attr-media-controls"><code>controls</code></dfn> attribute is a <a href="#boolean0">boolean attribute</a> . If the attribute is present, or if <del class="diff-old">scripting</del> <ins class= "diff-chg">the</ins> <a href="#media7"><ins class="diff-chg">media element</ins></a> is <del class="diff-old">disabled</del> <a href= "#without"><ins class="diff-chg">without script</ins></a> , then the user agent should <dfn id="expose">expose a user interface to the user</dfn> . This user interface should include features to begin playback, pause playback, seek to an arbitrary position in the content (if the content supports arbitrary seeking), change the volume, and show the media content in manners more suitable to the user (e.g. full-screen video or in an independent resizable window). Other controls may also be made available. If the attribute is absent, then the user agent should avoid making a user interface available that could conflict with an author-provided user interface. User agents may make the following features available, however, even when the attribute is absent: User agents may provide controls to affect playback of the media resource (e.g. play, pause, seeking, and volume controls), but such features should not interfere with the page's normal rendering. For example, such features could be exposed in the <a href= "#media7">media element</a> 's context menu. Where possible (specifically, for starting, stopping, pausing, and unpausing playback, for muting or changing the volume of the audio, and for seeking), user interface features exposed by the user agent must be implemented in terms of the DOM API described above, so that, e.g., all the same events fire. The <dfn id="controls0" title= "dom-media-controls"><code>controls</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the content attribute of the same name. The <dfn id="volume" title= "dom-media-volume"><code>volume</code></dfn> attribute must return the playback volume of any audio portions of the <a href= "#media7">media element</a> , in the range 0.0 (silent) to 1.0 (loudest). Initially, the volume must be 0.5, but user agents may remember the last set value across sessions, on a per-site basis or otherwise, so the volume may start at other values. On setting, if the new value is in the range 0.0 to 1.0 inclusive, the attribute must be set to the new value and the playback volume must be correspondingly adjusted as soon as possible after setting the attribute, with 0.0 being silent, and 1.0 being the loudest setting, values in between increasing in loudness. The range need not be linear. The loudest setting may be lower than the system's loudest possible setting; for example the user could have set a maximum volume. If the new value is outside the range 0.0 to 1.0 inclusive, then, on setting, an <code>INDEX_SIZE_ERR</code> exception must be raised instead. The <dfn id="muted" title= "dom-media-muted"><code>muted</code></dfn> attribute must return true if the audio channels are muted and false otherwise. On setting, the attribute must be set to the new value; if the new value is true, audio playback for this <a href="#media10">media resource</a> must then be muted, and if false, audio playback must then be enabled. Whenever either the <code title="dom-media-muted"><a href= "#muted">muted</a></code> or <code title= "dom-media-volume"><a href="#volume">volume</a></code> attributes are changed, after any running scripts have finished executing, the user agent must <a href="#firing2">fire a simple event</a> called <code title="event-volumechange"><a href= "#volumechange">volumechange</a></code> at the <a href= "#media7">media element</a> . <h5 id="time-ranges"><del class= "diff-old">3.14.9.11.</del> <ins class= "diff-chg">3.12.10.11.</ins> Time <del class= "diff-old">range</del> <ins class="diff-chg">ranges</ins></h5> Objects implementing the <code><a href= "#timeranges">TimeRanges</a></code> interface represent a list of ranges (periods) of time. <pre class="idl"> interface <dfn id="timeranges">TimeRanges</dfn> { readonly attribute unsigned long <a href="#length3" title= "dom-TimeRanges-length">length</a>; float <a href="#start4" title= "dom-TimeRanges-start">start</a>(in unsigned long index); float <a href="#endindex" title= "dom-TimeRanges-end">end</a>(in unsigned long index); }; </pre> The <dfn id="length3" title= "dom-TimeRanges-length"><code>length</code></dfn> DOM attribute must return the number of ranges represented by the object. The <dfn id="start4" title="dom-TimeRanges-start"><code>start( <var title="">index</var> )</code></dfn> method must return the position of the start of the <var title="">index</var> th range represented by the object, in seconds measured from the start of the timeline that the object covers. The <dfn id="endindex" title="dom-TimeRanges-end"><code>end( <var title="">index</var> )</code></dfn> method must return the position of the end of the <var title="">index</var> th range represented by the object, in seconds measured from the start of the timeline that the object covers. These methods must raise <code>INDEX_SIZE_ERR</code> exceptions if called with an <var title="">index</var> argument greater than or equal to the number of ranges represented by the object. When a <code><a href="#timeranges">TimeRanges</a></code> object is said to be a <del class="diff-old">normalised</del> <dfn id= "normalized"><ins class="diff-chg">normalized</ins> <code>TimeRanges</code> object</dfn> , the ranges it represents must obey the following criteria: <ul> <li>The start of a range must be greater than the end of all earlier ranges.</li> <li>The start of a range must be less than the end of that same range.</li> </ul> In other words, the ranges in such an object are ordered, don't overlap, <ins class="diff-new">aren't empty,</ins> and don't touch (adjacent ranges are folded into one bigger range). The timelines used by the objects returned by the <code title= "dom-media-buffered"><a href="#buffered">buffered</a></code> , <code title="dom-media-seekable"><a href= "#seekable">seekable</a></code> and <code title= "dom-media-played"><a href="#played">played</a></code> DOM attributes of <a href="#media7" title="media element">media elements</a> must be the same as that element's <a href= "#media10">media resource</a> 's timeline. <h5 id="byte-ranges"><ins class= "diff-new">3.12.10.12.</ins> <ins class="diff-new">Byte ranges</ins></h5> <ins class="diff-new">Objects implementing the</ins> <code><a href="#byteranges"><ins class= "diff-new">ByteRanges</ins></a></code> <ins class= "diff-new">interface represent a list of ranges of bytes.</ins> <pre class="idl"> interface <dfn id="byteranges">ByteRanges</dfn> {<ins class= "diff-new"> readonly attribute unsigned long <a href="#length4" title= "dom-ByteRanges-length">length</a>; unsigned long <a href="#start5" title= "dom-ByteRanges-start">start</a>(in unsigned long index); unsigned long <a href="#endindex0" title= "dom-ByteRanges-end">end</a>(in unsigned long index); }; </ins> </pre> <ins class="diff-new">The</ins> <dfn id="length4" title= "dom-ByteRanges-length"><code><ins class= "diff-new">length</ins></code></dfn> <ins class="diff-new">DOM attribute must return the number of ranges represented by the object.</ins> <ins class="diff-new">The</ins> <dfn id="start5" title= "dom-ByteRanges-start"><code><ins class="diff-new">start(</ins> <var title=""><ins class="diff-new">index</ins></var> <ins class= "diff-new">)</ins></code></dfn> <ins class="diff-new">method must return the position of the first byte of the</ins> <var title= ""><ins class="diff-new">index</ins></var> <ins class="diff-new">th range represented by the object.</ins> <ins class="diff-new">The</ins> <dfn id="endindex0" title= "dom-ByteRanges-end"><code><ins class="diff-new">end(</ins> <var title=""><ins class="diff-new">index</ins></var> <ins class= "diff-new">)</ins></code></dfn> <ins class="diff-new">method must return the position of the byte immediately after the last byte of the</ins> <var title=""><ins class="diff-new">index</ins></var> <ins class="diff-new">th range represented by the object. (The byte position returned by this method is not in the range itself. If the first byte of the range is the byte at position 0, and the entire stream of bytes is in the range, then the value of the position of the byte returned by this method for that range will be the same as the number of bytes in the stream.)</ins> <ins class="diff-new">These methods must raise</ins> <code><ins class="diff-new">INDEX_SIZE_ERR</ins></code> <ins class= "diff-new">exceptions if called with an</ins> <var title= ""><ins class="diff-new">index</ins></var> <ins class= "diff-new">argument greater than or equal to the number of ranges represented by the object.</ins> <ins class="diff-new">When a</ins> <code><a href= "#byteranges"><ins class="diff-new">ByteRanges</ins></a></code> <ins class="diff-new">object is said to be a</ins> <dfn id= "normalized0"><ins class="diff-new">normalized</ins> <code><ins class="diff-new">ByteRanges</ins></code> <ins class= "diff-new">object</ins></dfn> ,<ins class="diff-new">the ranges it represents must obey the following criteria:</ins> <ul> <li><ins class="diff-new">The start of a range must be greater than the end of all earlier ranges.</ins></li> <li><ins class="diff-new">The start of a range must be less than the end of that same range.</ins></li> </ul> <ins class="diff-new">In other words, the ranges in such an object are ordered, don't overlap, aren't empty, and don't touch (adjacent ranges are folded into one bigger range).</ins> <h5 id="mediaevents"><del class= "diff-old">3.14.9.12.</del> <ins class= "diff-chg">3.12.10.13.</ins> Event summary</h5> The following events fire on <a href="#media7" title= "media element">media elements</a> as part of the processing model described above: <table> <thead> <tr> <th>Event name</th> <th>Interface</th> <th>Dispatched when...</th> <th>Preconditions</th> </tr> </thead> <tbody> <tr> <td><dfn id="loadstart" title="event-loadstart"><code><del class= "diff-old">begin</del> <ins class= "diff-chg">loadstart</ins></code></dfn></td> <td><code>ProgressEvent</code> <a href= "#references">[PROGRESS]</a></td> <td>The user agent begins fetching the <a href="#media9">media data</a> , synchronously during the <code title= "dom-media-load"><a href="#load">load()</a></code> method call.</td> <td><code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> equals <code title= "dom-media-LOADING"><a href="#loading0">LOADING</a></code></td> </tr> <tr> <td><dfn id="progress0" title= "event-progress"><code>progress</code></dfn></td> <td><code>ProgressEvent</code> <a href= "#references">[PROGRESS]</a></td> <td>The user agent is fetching <a href="#media9">media data</a> .</td> <td><code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> is more than <code title= "dom-media-EMPTY"><a href="#empty">EMPTY</a></code> and less than <code title="dom-media-LOADED"><a href= "#loaded">LOADED</a></code></td> </tr> <tr> <td><dfn id="loadedmetadata0" title= "event-loadedmetadata"><code>loadedmetadata</code></dfn></td> <td><code>Event</code></td> <td>The user agent is fetching <a href="#media9">media data</a> , and the <a href="#media10">media resource</a> 's metadata has just been received.</td> <td><code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> equals <code title= "dom-media-LOADED_METADATA"><a href= "#loadedmetadata">LOADED_METADATA</a></code></td> </tr> <tr> <td><dfn id="loadedfirstframe0" title= "event-loadedfirstframe"><code>loadedfirstframe</code></dfn></td> <td><code>Event</code></td> <td>The user agent is fetching <a href="#media9">media data</a> , and the <a href="#media10">media resource</a> 's first frame has just been received.</td> <td><code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> equals <code title= "dom-media-LOADED_FIRST_FRAME"><a href= "#loadedfirstframe">LOADED_FIRST_FRAME</a></code></td> </tr> <tr> <td><dfn id="load0" title="event-load"><code>load</code></dfn></td> <td><code>ProgressEvent</code> <a href= "#references">[PROGRESS]</a></td> <td>The user agent finishes downloading the entire <a href= "#media10">media resource</a> .</td> <td><code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> equals <code title= "dom-media-LOADED"><a href="#loaded">LOADED</a></code></td> </tr> <tr> <td><dfn id="abort" title= "event-abort"><code>abort</code></dfn></td> <td><code>ProgressEvent</code> <a href= "#references">[PROGRESS]</a></td> <td>The user agent stops fetching the <a href="#media9">media data</a> before it is completely downloaded. This can be fired synchronously during the <code title="dom-media-load"><a href= "#load">load()</a></code> method call.</td> <td><code title="dom-media-error"><a href= "#error0">error</a></code> is an object with the code <code title= "dom-MediaError-MEDIA_ERR_ABORTED"><a href= "#mediaerraborted">MEDIA_ERR_ABORTED</a></code> . <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> equals either <code title= "dom-media-EMPTY"><a href="#empty">EMPTY</a></code> or <code title= "dom-media-LOADED"><a href="#loaded">LOADED</a></code> , depending on when the download was aborted.</td> </tr> <tr> <td><dfn id="error1" title= "event-error"><code>error</code></dfn></td> <td><code>ProgressEvent</code> <a href= "#references">[PROGRESS]</a></td> <td>An error occurs while fetching the <a href="#media9">media data</a> .</td> <td><code title="dom-media-error"><a href= "#error0">error</a></code> is an object with the code <code title= "dom-MediaError-MEDIA_ERR_NETWORK_ERROR">MEDIA_ERR_NETWORK_ERROR</code> or higher. <code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> equals either <code title= "dom-media-EMPTY"><a href="#empty">EMPTY</a></code> or <code title= "dom-media-LOADED"><a href="#loaded">LOADED</a></code> , depending on when the download was aborted.</td> </tr> <tr> <td><dfn id="emptied" title= "event-emptied"><code>emptied</code></dfn></td> <td><code>Event</code></td> <td>A <a href="#media7">media element</a> whose <code title= "dom-media-networkState"><a href= "#networkstate">networkState</a></code> was previously not in the <code title="dom-media-EMPTY"><a href="#empty">EMPTY</a></code> state has just switched to that state (either because of a fatal error during load that's about to be reported, or because the <code title="dom-media-load"><a href="#load">load()</a></code> method was reinvoked, in which case it is fired synchronously during the <code title="dom-media-load"><a href= "#load">load()</a></code> method call).</td> <td><code title="dom-media-networkState"><a href= "#networkstate">networkState</a></code> is <code title= "dom-media-EMPTY"><a href="#empty">EMPTY</a></code> ; all the DOM attributes are in their initial states.</td> </tr> <tr> <td><dfn id="stalled" title= "event-stalled"><code>stalled</code></dfn></td> <td><code>ProgressEvent</code></td> <td>The user agent is trying to fetch <a href="#media9">media data</a> , but data is unexpectedly not forthcoming.</td> <td></td> </tr> <tr> <td><dfn id="play0" title="event-play"><code>play</code></dfn></td> <td><code>Event</code></td> <td>Playback has begun. Fired after the <code title= "dom-media-play"><a href="#play">play</a></code> method has returned.</td> <td><code title="dom-media-paused"><a href= "#paused">paused</a></code> is newly false.</td> </tr> <tr> <td><dfn id="pause1" title= "event-pause"><code>pause</code></dfn></td> <td><code>Event</code></td> <td>Playback has been paused. Fired after the <code title= "dom-media-pause"><a href="#pause0">pause</a></code> method has returned.</td> <td><code title="dom-media-paused"><a href= "#paused">paused</a></code> is newly true.</td> </tr> <tr> <td><dfn id="waiting" title= "event-waiting"><code>waiting</code></dfn></td> <td><code>Event</code></td> <td>Playback has stopped because the next frame is not available, but the user agent expects that frame to become available in due course.</td> <td><code title="dom-media-readyState"><a href= "#readystate0">readyState</a></code> is either <code title= "dom-media-DATA_UNAVAILABLE"><a href= "#dataunavailable">DATA_UNAVAILABLE</a></code> or <code title= "dom-media-CAN_SHOW_CURRENT_FRAME"><a href= "#canshowcurrentframe">CAN_SHOW_CURRENT_FRAME</a></code> , and <code title="dom-media-paused"><a href="#paused">paused</a></code> is false. Either <code title="dom-media-seeking"><a href= "#seeking0">seeking</a></code> is true, or the <a href= "#current0">current playback position</a> is not contained in any of the ranges in <code title="dom-media-buffered"><a href= "#buffered">buffered</a></code> . It is possible for playback to stop for two other reasons without <code title= "dom-media-paused"><a href="#paused">paused</a></code> being false, but those two reasons do not fire this event: maybe <a href= "#ended" title="ended playback">playback ended</a> , or playback <a href="#stopped">stopped due to errors</a> .</td> </tr> <tr> <td><dfn id="seeking1" title="event-seeking"><code><ins class= "diff-new">seeking</ins></code></dfn></td> <td><code><ins class="diff-new">Event</ins></code></td> <td><ins class="diff-new">The</ins> <code title= "dom-media-seeking"><a href="#seeking0"><ins class= "diff-new">seeking</ins></a></code> <ins class="diff-new">DOM attribute changed to true and the seek operation is taking long enough that the user agent has time to fire the event.</ins></td> <td></td> </tr> <tr> <td><dfn id="seeked" title="event-seeked"><code><ins class= "diff-new">seeked</ins></code></dfn></td> <td><code><ins class="diff-new">Event</ins></code></td> <td><ins class="diff-new">The</ins> <code title= "dom-media-seeking"><a href="#seeking0"><ins class= "diff-new">seeking</ins></a></code> <ins class="diff-new">DOM attribute changed to false.</ins></td> <td></td> </tr> <tr> <td><dfn id="timeupdate" title= "event-timeupdate"><code>timeupdate</code></dfn></td> <td><code>Event</code></td> <td>The <a href="#current0">current playback position</a> changed in an interesting way, for example discontinuously.</td> <td></td> </tr> <tr> <td><dfn id="ended1" title= "event-ended"><code>ended</code></dfn></td> <td><code>Event</code></td> <td>Playback has stopped because the end of the <a href= "#media10">media resource</a> was reached.</td> <td><code title="dom-media-currentTime"><a href= "#currenttime">currentTime</a></code> equals the <var><a href= "#effective2">effective end</a></var> ; <code title= "dom-media-ended"><a href="#ended0">ended</a></code> is true.</td> </tr> <tr> <td><dfn id="dataunavailable0" title= "event-dataunavailable"><code>dataunavailable</code></dfn></td> <td><code>Event</code></td> <td>The user agent cannot render the data at the <a href= "#current0">current playback position</a> because data for the current frame is not immediately available.</td> <td>The <code title="dom-media-readyState"><a href= "#readystate0">readyState</a></code> attribute is newly equal to <code title="DATA_UNAVAILABLE">DATA_UNAVAILABLE</code> .</td> </tr> <tr> <td><dfn id="canshowcurrentframe0" title= "event-canshowcurrentframe"><code>canshowcurrentframe</code></dfn></td> <td><code>Event</code></td> <td>The user agent cannot render the data after the <a href= "#current0">current playback position</a> because data for the next frame is not immediately available.</td> <td>The <code title="dom-media-readyState"><a href= "#readystate0">readyState</a></code> attribute is newly equal to <code title="dom-media-CAN_SHOW_CURRENT_FRAME"><a href= "#canshowcurrentframe">CAN_SHOW_CURRENT_FRAME</a></code> .</td> </tr> <tr> <td><dfn id="canplay0" title= "event-canplay"><code>canplay</code></dfn></td> <td><code>Event</code></td> <td>The user agent can resume playback of the <a href= "#media9">media data</a> , but estimates that if playback were to be started now, the <a href="#media10">media resource</a> could not be rendered at the current playback rate up to its end without having to stop for further buffering of content.</td> <td>The <code title="dom-media-readyState"><a href= "#readystate0">readyState</a></code> attribute is newly equal to <code title="dom-media-CAN_PLAY"><a href= "#canplay">CAN_PLAY</a></code> .</td> </tr> <tr> <td><dfn id="canplaythrough0" title= "event-canplaythrough"><code>canplaythrough</code></dfn></td> <td><code>Event</code></td> <td>The user agent estimates that if playback were to be started now, the <a href="#media10">media resource</a> could be rendered at the current playback rate all the way to its end without having to stop for further buffering.</td> <td>The <code title="dom-media-readyState"><a href= "#readystate0">readyState</a></code> attribute is newly equal to <code title="dom-media-CAN_PLAY_THROUGH"><a href= "#canplaythrough">CAN_PLAY_THROUGH</a></code> .</td> </tr> <tr> <td><dfn id="ratechange" title= "event-ratechange"><code>ratechange</code></dfn></td> <td><code>Event</code></td> <td>Either the <code title="dom-media-defaultPlaybackRate"><a href= "#defaultplaybackrate">defaultPlaybackRate</a></code> or the <code title="dom-media-playbackRate"><a href= "#playbackrate">playbackRate</a></code> attribute has just been updated.</td> <td></td> </tr> <tr> <td><dfn id="durationchange" title= "event-durationchange"><code>durationchange</code></dfn></td> <td><code>Event</code></td> <td>The <code title="dom-media-duration"><a href= "#duration">duration</a></code> attribute has just been updated.</td> <td></td> </tr> <tr> <td><dfn id="volumechange" title= "event-volumechange"><code>volumechange</code></dfn></td> <td><code>Event</code></td> <td>Either the <code title="dom-media-volume"><a href= "#volume">volume</a></code> attribute or the <code title= "dom-media-muted"><a href="#muted">muted</a></code> attribute has changed. Fired after the relevant attribute's setter has returned.</td> <td></td> </tr> </tbody> </table> <h5 id="security0"><del class= "diff-old">3.14.9.13.</del> <ins class= "diff-chg">3.12.10.14.</ins> Security and privacy considerations</h5> Talk about making sure interactive media files (e.g. SVG) don't have access to the container DOM (XSS potential); talk about not exposing any sensitive data like metadata from tracks in the media files (intranet snooping risk) <del class= "diff-old">3.14.10. The source element Categories None. Contexts in which this element may be used: As a child of a media element , before any prose content . Content model: Empty. Element-specific attributes: src type media DOM interface: <pre class=idl>interface { attribute DOMString ; attribute DOMString ; attribute DOMString ; }; The source element allows authors to specify multiple media resources for media elements . The src attribute gives the address of the media resource . The value must be a URI (or IRI). This attribute must be present. The type attribute gives the type of the media resource , to help the user agent determine if it can play this media resource before downloading it. Its value must be a MIME type. The codecs parameter may be specified and might be necessary to specify exactly how the resource is encoded. [RFC2046] [RFC4281] The following list shows some examples of how to use the codecs= MIME parameter in the type attribute. H.264 Simple baseline profile video (main and extended video compatible) level 3 and Low-Complexity AAC audio in MP4 container <source src="video.mp4" type="video/mp4; codecs=&quot;avc1.42E01E, mp4a.40.2&quot;"> H.264 Extended profile video (baseline-compatible) level 3 and Low-Complexity AAC audio in MP4 container <source src="video.mp4" type="video/mp4; codecs=&quot;avc1.58A01E, mp4a.40.2&quot;"> H.264 Main profile video level 3 and Low-Complexity AAC audio in MP4 container <source src="video.mp4" type="video/mp4; codecs=&quot;avc1.4D401E, mp4a.40.2&quot;"> H.264 "High" profile video (incompatible with main, baseline, or extended profiles) level 3 and Low-Complexity AAC audio in MP4 container <source src="video.mp4" type="video/mp4; codecs=&quot;avc1.64001E, mp4a.40.2&quot;"> MPEG-4 Visual Simple Profile Level 0 video and Low-Complexity AAC audio in MP4 container <source src="video.mp4" type="video/mp4; codecs=&quot;mp4v.20.8, mp4a.40.2&quot;"> MPEG-4 Advanced Simple Profile Level 0 video and Low-Complexity AAC audio in MP4 container <source src="video.mp4" type="video/mp4; codecs=&quot;mp4v.20.240, mp4a.40.2&quot;"> MPEG-4 Visual Simple Profile Level 0 video and AMR audio in 3GPP container <source src="video.3gp" type="video/3gpp; codecs=&quot;mp4v.20.8, samr&quot;"> Theora video and Vorbis audio in Ogg container <source src="video.ogv" type="video/ogg; codecs=&quot;theora, vorbis&quot;"> Theora video and Speex audio in Ogg container <source src="video.ogv" type="video/ogg; codecs=&quot;theora, speex&quot;"> Vorbis audio alone in Ogg container <source src="audio.oga" type="audio/ogg; codecs=vorbis"> Speex audio alone in Ogg container <source src="audio.oga" type="audio/ogg; codecs=speex"> Flac audio alone in Ogg container <source src="audio.oga" type="audio/ogg; codecs=flac"> Dirac video and Vorbis audio in Ogg container <source src="video.ogv" type="video/ogg; codecs=&quot;dirac, vorbis&quot;"> Theora video and Vorbis audio in Matroska container <source src="video.mkv" type="video/x-matroska; codecs=&quot;theora, vorbis&quot;"> The media attribute gives the intended media type of the media resource , to help the user agent determine if this media resource is useful to the user before downloading it. Its value must be a valid media query. [MQ] Either the type attribute, the media attribute or both, must be specified, unless this is the last source element child of the parent element. If a source element is inserted into a media element that is already in a document and whose networkState is in the EMPTY state, the user agent must implicitly invoke the load() method on the media element as soon as all other scripts have finished executing. Any exceptions raised must be ignored. The DOM attributes src , type , and media must reflect the respective content attributes of the same name.</del> <h4 id="the-canvas"><del class= "diff-old">3.14.11.</del> <ins class= "diff-chg">3.12.11</ins> The <dfn id= "canvas"><code>canvas</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#embedded1">Embedded content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#embedded1">embedded content</a> is expected.</dd> <dt>Content model:</dt> <dd><a href="#transparent0">Transparent</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-canvas-width"><a href= "#width0">width</a></code></dd> <dd><code title="attr-canvas-height"><a href= "#height0">height</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlcanvaselement">HTMLCanvasElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { <del class="diff-old"> attribute unsigned long ; attribute unsigned long ; </del> <ins class="diff-chg"> attribute unsigned long <a href= "#width1" title="dom-canvas-width">width</a>; attribute unsigned long <a href="#height1" title= "dom-canvas-height">height</a>; </ins> DOMString <a href="#todataurl" title= "dom-canvas-toDataURL">toDataURL</a>(); DOMString <a href="#todataurl0" title= "dom-canvas-toDataURL-type">toDataURL</a>(in DOMString type); DOMObject <a href="#getcontext" title= "dom-canvas-getContext">getContext</a>(in DOMString contextId); }; </pre></dd> </dl> The <code><a href="#canvas">canvas</a></code> element represents a resolution-dependent bitmap canvas, which can be used for rendering graphs, game graphics, or other visual images on the fly. Authors should not use the <code><a href= "#canvas">canvas</a></code> element in a document when a more suitable element is available. For example, it is inappropriate to use a <code><a href="#canvas">canvas</a></code> element to render a page heading: if the desired presentation of the heading is graphically intense, it should be marked up using appropriate elements (typically <code><a href="#h1">h1</a></code> ) and then styled using CSS and supporting technologies such as XBL. When authors use the <code><a href="#canvas">canvas</a></code> element, they should also provide content that, when presented to the user, conveys essentially the same function or purpose as the bitmap canvas. This content may be placed as content of the <code><a href="#canvas">canvas</a></code> element. The contents of the <code><a href="#canvas">canvas</a></code> element, if any, are the element's <a href="#fallback">fallback content</a> . In interactive visual <del class="diff-old">media with scripting enabled ,</del> <ins class="diff-chg">media, if</ins> the <code><a href="#canvas">canvas</a></code> element is <a href= "#with-script"><ins class="diff-new">with script</ins></a> ,<ins class="diff-new">the</ins> <code><a href= "#canvas"><ins class="diff-new">canvas</ins></a></code> <ins class= "diff-new">element represents</ins> an embedded element with a dynamically created image. In non-interactive, static, visual media, if the <code><a href= "#canvas">canvas</a></code> element has been previously painted on (e.g. if the page was viewed in an interactive visual medium and is now being printed, or if some script that ran during the page layout process painted on the element), then the <code><a href= "#canvas">canvas</a></code> element <del class="diff-old">must be treated as</del> <ins class="diff-chg">represents</ins> <a href= "#embedded1">embedded content</a> with the current image and size. Otherwise, the <del class="diff-old">element's</del> <ins class= "diff-chg">element represents its</ins> <a href= "#fallback">fallback content</a> <del class="diff-old">must be used</del> instead. In non-visual media, and in visual media <del class= "diff-old">with scripting disabled ,</del> <ins class= "diff-chg">if</ins> the <code><a href="#canvas">canvas</a></code> <del class="diff-old">element's</del> <ins class="diff-chg">element is</ins> <a href="#without"><ins class="diff-chg">without script</ins></a> ,<ins class="diff-chg">the</ins> <code><a href= "#canvas"><ins class="diff-chg">canvas</ins></a></code> <ins class= "diff-chg">element represents its</ins> <a href= "#fallback">fallback content</a> <del class="diff-old">must be used</del> instead. The <code><a href="#canvas">canvas</a></code> element has two attributes to control the size of the coordinate space: <dfn id= "width0" title="attr-canvas-width"><code>width</code></dfn> and <dfn id="height0" title= "attr-canvas-height"><code>height</code></dfn> . These attributes, when specified, must have values that are <a href="#valid" title= "valid non-negative integer">valid non-negative integers</a> . The <a href="#rules">rules for parsing non-negative integers</a> must be used to obtain their numeric values. If an attribute is missing, or if parsing its value returns an error, then the default value must be used instead. The <code title="attr-canvas-width"><a href= "#width0">width</a></code> attribute defaults to 300, and the <code title="attr-canvas-height"><a href= "#height0">height</a></code> attribute defaults to 150. The intrinsic dimensions of the <code><a href= "#canvas">canvas</a></code> element equal the size of the coordinate space, with the numbers interpreted in CSS pixels. However, the element can be sized arbitrarily by a style sheet. During rendering, the image is scaled to fit this layout size. The size of the coordinate space does not necessarily represent the size of the actual bitmap that the user agent will use internally or during rendering. On high-definition displays, for instance, the user agent may internally use a bitmap with two device pixels per unit in the coordinate space, so that the rendering remains at high quality throughout. <del class="diff-old">The canvas must initially be fully transparent black.</del> Whenever the <code title= "attr-canvas-width"><a href="#width0">width</a></code> and <code title="attr-canvas-height"><a href= "#height0">height</a></code> attributes are set (whether to a new value or to the previous value), the bitmap and any associated contexts must be cleared back to their initial state and <del class="diff-old">reinitialised</del> <ins class= "diff-chg">reinitialized</ins> with the newly specified coordinate space dimensions. The <dfn id="width1" title= "dom-canvas-width"><code>width</code></dfn> and <dfn id="height1" title="dom-canvas-height"><code>height</code></dfn> DOM attributes must <a href="#reflect">reflect</a> the content attributes of the same name. <div class="example"> Only one square appears to be drawn in the following example: <pre> // canvas is a reference to a <canvas> element var context = canvas.getContext('2d'); context.fillRect(0,0,50,50); canvas.setAttribute('width', '300'); // clears the canvas context.fillRect(0,100,50,50); canvas.width = canvas.width; // clears the canvas context.fillRect(100,0,50,50); // only this square remains </pre></div> <ins class="diff-new">When the canvas is initialized it must be set to fully transparent black.</ins> To draw on the canvas, authors must first obtain a reference to a <dfn id="context0">context</dfn> using the <dfn id="getcontext" title="dom-canvas-getContext"><code>getContext( <var title= "">contextId</var> )</code></dfn> method of the <code><a href= "#canvas">canvas</a></code> element. This specification only defines one context, with the name " <code title="canvas-context-2d"><a href="#d">2d</a></code> ". If <code title="dom-canvas-getContext"><a href= "#getcontext">getContext()</a></code> is called with that exact string for its <var title="">contextId</var> argument, then the UA must return a reference to an object implementing <code><a href= "#canvasrenderingcontext2d">CanvasRenderingContext2D</a></code> . Other specifications may define their own contexts, which would return different objects. Vendors may also define experimental contexts using the syntax <code><var title="">vendorname</var> - <var title= "">context</var></code> , for example, <code>moz-3d</code> . When the UA is passed an empty string or a string specifying a context that it does not support, then it must return null. String comparisons must be literal and case-sensitive. <ins class="diff-new">Arguments other than the</ins> <var title= ""><ins class="diff-new">contextId</ins></var> <ins class= "diff-new">must be ignored, and must not cause the user agent to raise an exception (as would normally occur if a method was called with the wrong number of arguments).</ins> A future version of this specification will probably define a <code>3d</code> context (probably based on the OpenGL ES API). The <dfn id="todataurl" title= "dom-canvas-toDataURL"><code>toDataURL()</code></dfn> method must, when called with no arguments, return a <code title="">data:</code> URI containing a representation of the image as a PNG file. <a href="#references">[PNG]</a> . <ins class="diff-new">If the canvas has no pixels (i.e. either its horizontal dimension or its vertical dimension is zero) then the method must return the string "</ins> <code title= ""><ins class="diff-new">data:,</ins></code> <ins class= "diff-new">". (This is the shortest</ins> <code title= ""><ins class="diff-new">data:</ins></code> <ins class= "diff-new">URI; it represents the empty string in a</ins> <code title=""><ins class="diff-new">text/plain</ins></code> <ins class="diff-new">resource.)</ins> The <dfn id="todataurl0" title= "dom-canvas-toDataURL-type"><code>toDataURL( <var title= "">type</var> )</code></dfn> method (when called with one or more arguments) must return a <code title="">data:</code> URI containing a representation of the image in the format given by <var title="">type</var> . The possible values are MIME types with no parameters, for example <code>image/png</code> , <code>image/jpeg</code> , or even maybe <code>image/svg+xml</code> if the implementation actually keeps enough information to reliably render an SVG image from the canvas. Only support for <code>image/png</code> is required. User agents may support other types. If the user agent does not support the requested type, it must return the image using the PNG format. User agents must convert the provided type to lower case before establishing if they support that type and before creating the <code title="">data:</code> URI. When trying to use types other than <code>image/png</code> , authors can check if the image was really returned in the requested format by checking to see if the returned string starts with one the exact strings " <code title= "">data:image/png,</code> " or " <code title= "">data:image/png;</code> ". If it does, the image is PNG, and thus the requested type was not supported. <ins class="diff-new">(The one exception to this is if the canvas has either no height or no width, in which case the result might simply be "</ins> <code title=""><ins class="diff-new">data:,</ins></code> <ins class="diff-new">".)</ins> Arguments other than the <var title="">type</var> must be ignored, and must not cause the user agent to raise an exception (as would normally occur if a method was called with the wrong number of arguments). A future version of this specification will probably allow extra parameters to be passed to <code title= "dom-canvas-toDataURL"><a href="#todataurl">toDataURL()</a></code> to allow authors to more carefully control compression settings, image metadata, etc. <del class="diff-old">Security: To prevent information leakage , the toDataURL() and getImageData() methods should raise a security exception if the canvas has ever had an image painted on it whose origin is different from that of the script calling the method.</del> <h5 id="the-2d"><del class= "diff-old">3.14.11.1.</del> <ins class= "diff-chg">3.12.11.1.</ins> The 2D context</h5> When the <code title="dom-canvas-getContext"><a href= "#getcontext">getContext()</a></code> method of a <code><a href= "#canvas">canvas</a></code> element is invoked with <dfn id="d" title="canvas-context-2d"><code>2d</code></dfn> as the argument, a <code><a href= "#canvasrenderingcontext2d">CanvasRenderingContext2D</a></code> object is returned. There is only one <code><a href= "#canvasrenderingcontext2d">CanvasRenderingContext2D</a></code> object per canvas, so calling the <code title= "dom-canvas-getContext"><a href= "#getcontext">getContext()</a></code> method with the <code title= "canvas-context-2d"><a href="#d">2d</a></code> argument a second time must return the same object. The 2D context represents a flat <del class= "diff-old">cartesian</del> <ins class="diff-chg">Cartesian</ins> surface whose origin (0,0) is at the top left corner, with the coordinate space having <var title="">x</var> values increasing when going right, and <var title="">y</var> values increasing when going down. <pre class="idl"> interface <dfn id= "canvasrenderingcontext2d">CanvasRenderingContext2D</dfn> { // back-reference to the canvas readonly attribute <a href= "#htmlcanvaselement">HTMLCanvasElement</a> <a href="#canvas0" title="dom-context-2d-canvas">canvas</a>; // state void <a href="#save" title= "dom-context-2d-save">save</a>(); // push state on state stack void <a href="#restore" title= "dom-context-2d-restore">restore</a>(); // pop state stack and restore state // transformations (default transform is the identity matrix) void <a href="#scale" title= "dom-context-2d-scale">scale</a>(in float x, in float y); void <a href="#rotate" title= "dom-context-2d-rotate">rotate</a>(in float angle); void <a href="#translate" title= "dom-context-2d-translate">translate</a>(in float x, in float y); void <a href="#transform" title= "dom-context-2d-transform">transform</a>(in float m11, in float m12, in float m21, in float m22, in float dx, in float dy); void <a href="#settransform" title= "dom-context-2d-setTransform">setTransform</a>(in float m11, in float m12, in float m21, in float m22, in float dx, in float dy); // compositing attribute float <a href="#globalalpha" title= "dom-context-2d-globalAlpha">globalAlpha</a>; // (default 1.0) attribute DOMString <a href="#globalcompositeoperation" title= "dom-context-2d-globalCompositeOperation">globalCompositeOperation</a>; // (default source-over) // colors and styles attribute DOMObject <a href="#strokestyle" title= "dom-context-2d-strokeStyle">strokeStyle</a>; // (default black) attribute DOMObject <a href="#fillstyle" title= "dom-context-2d-fillStyle">fillStyle</a>; // (default black) <a href="#canvasgradient0">CanvasGradient</a> <a href= "#createlineargradient" title= "dom-context-2d-createLinearGradient">createLinearGradient</a>(in float x0, in float y0, in float x1, in float y1); <a href="#canvasgradient0">CanvasGradient</a> <a href= "#createradialgradient" title= "dom-context-2d-createRadialGradient">createRadialGradient</a>(in float x0, in float y0, in float r0, in float x1, in float y1, in float r1); <del class="diff-old"> image, DOMString repetition); image, DOMString repetition); </del> <a href="#canvaspattern0">CanvasPattern</a> <a href= "#createpattern" title= "dom-context-2d-createPattern">createPattern</a>(in <a href= "#htmlimageelement">HTMLImageElement</a> image, in DOMString repetition); <a href="#canvaspattern0">CanvasPattern</a> <a href= "#createpattern" title= "dom-context-2d-createPattern">createPattern</a>(in <a href= "#htmlcanvaselement">HTMLCanvasElement</a> image, in DOMString repetition); // line caps/joins attribute float <a href="#linewidth" title= "dom-context-2d-lineWidth">lineWidth</a>; // (default 1) attribute DOMString <a href="#linecap" title= "dom-context-2d-lineCap">lineCap</a>; // "butt", "round", "square" (default "butt") attribute DOMString <a href="#linejoin" title= "dom-context-2d-lineJoin">lineJoin</a>; // "round", "bevel", "miter" (default "miter") attribute float <a href="#miterlimit" title= "dom-context-2d-miterLimit">miterLimit</a>; // (default 10) // shadows attribute float <a href="#shadowoffsetx" title= "dom-context-2d-shadowOffsetX">shadowOffsetX</a>; // (default 0) attribute float <a href="#shadowoffsety" title= "dom-context-2d-shadowOffsetY">shadowOffsetY</a>; // (default 0) attribute float <a href="#shadowblur" title= "dom-context-2d-shadowBlur">shadowBlur</a>; // (default 0) attribute DOMString <a href="#shadowcolor" title= "dom-context-2d-shadowColor">shadowColor</a>; // (default transparent black) // rects void <a href="#clearrect" title= "dom-context-2d-clearRect">clearRect</a>(in float x, in float y, in float w, in float h); void <a href="#fillrect" title= "dom-context-2d-fillRect">fillRect</a>(in float x, in float y, in float w, in float h); void <a href="#strokerect" title= "dom-context-2d-strokeRect">strokeRect</a>(in float x, in float y, in float w, in float h); // path API void <a href="#beginpath" title= "dom-context-2d-beginPath">beginPath</a>(); void <a href="#closepath" title= "dom-context-2d-closePath">closePath</a>(); void <a href="#moveto" title= "dom-context-2d-moveTo">moveTo</a>(in float x, in float y); void <a href="#lineto" title= "dom-context-2d-lineTo">lineTo</a>(in float x, in float y); void <a href="#quadraticcurveto" title= "dom-context-2d-quadraticCurveTo">quadraticCurveTo</a>(in float cpx, in float cpy, in float x, in float y); void <a href="#beziercurveto" title= "dom-context-2d-bezierCurveTo">bezierCurveTo</a>(in float cp1x, in float cp1y, in float cp2x, in float cp2y, in float x, in float y); void <a href="#arcto" title= "dom-context-2d-arcTo">arcTo</a>(in float x1, in float y1, in float x2, in float y2, in float radius); void <a href="#rectx" title= "dom-context-2d-rect">rect</a>(in float x, in float y, in float w, in float h); void <a href="#arcx-" title= "dom-context-2d-arc">arc</a>(in float x, in float y, in float radius, in float startAngle, in float endAngle, in boolean anticlockwise); void <a href="#fill" title="dom-context-2d-fill">fill</a>(); void <a href="#stroke" title= "dom-context-2d-stroke">stroke</a>(); void <a href="#clip" title="dom-context-2d-clip">clip</a>(); boolean <a href="#ispointinpath" title= "dom-context-2d-isPointInPath">isPointInPath</a>(in float x, in float y); <ins class="diff-new"> // text attribute DOMString <a href="#font" title= "dom-context-2d-font">font</a>; // (default 10px sans-serif) attribute DOMString <a href="#textalign" title= "dom-context-2d-textAlign">textAlign</a>; // "start", "end", "left", "right", "center" (default: "start") attribute DOMString <a href="#textbaseline" title= "dom-context-2d-textBaseline">textBaseline</a>; // "top", "hanging", "middle", "alphabetic", "ideographic", "bottom" (default: "alphabetic") void <a href="#filltext" title= "dom-context-2d-fillText">fillText</a>(in DOMString text, in float x, in float y); void <a href="#filltext" title= "dom-context-2d-fillText">fillText</a>(in DOMString text, in float x, in float y, in float maxWidth); void <a href="#stroketext" title= "dom-context-2d-strokeText">strokeText</a>(in DOMString text, in float x, in float y); void <a href="#stroketext" title= "dom-context-2d-strokeText">strokeText</a>(in DOMString text, in float x, in float y, in float maxWidth); </ins> <a href="#textmetrics">TextMetrics</a> <a href= "#measuretext" title= "dom-context-2d-measureText">measureText</a>(in DOMString text); // drawing images void <a href="#drawimage" title= "dom-context-2d-drawImage">drawImage</a>(in <a href= "#htmlimageelement">HTMLImageElement</a> image, in float dx, in float dy); void <a href="#drawimage" title= "dom-context-2d-drawImage">drawImage</a>(in <a href= "#htmlimageelement">HTMLImageElement</a> image, in float dx, in float dy, in float dw, in float dh); void <a href="#drawimage" title= "dom-context-2d-drawImage">drawImage</a>(in <a href= "#htmlimageelement">HTMLImageElement</a> image, in float sx, in float sy, in float sw, in float sh, in float dx, in float dy, in float dw, in float dh); void <a href="#drawimage" title= "dom-context-2d-drawImage">drawImage</a>(in <a href= "#htmlcanvaselement">HTMLCanvasElement</a> image, in float dx, in float dy); void <a href="#drawimage" title= "dom-context-2d-drawImage">drawImage</a>(in <a href= "#htmlcanvaselement">HTMLCanvasElement</a> image, in float dx, in float dy, in float dw, in float dh); void <a href="#drawimage" title= "dom-context-2d-drawImage">drawImage</a>(in <a href= "#htmlcanvaselement">HTMLCanvasElement</a> image, in float sx, in float sy, in float sw, in float sh, in float dx, in float dy, in float dw, in float dh); // pixel manipulation <a href="#imagedata">ImageData</a> <a href="#createimagedata" title= "dom-context-2d-createImageData">createImageData</a>(in float sw, in float sh); <a href="#imagedata">ImageData</a> <a href="#getimagedata" title= "dom-context-2d-getImageData">getImageData</a>(in float sx, in float sy, in float sw, in float sh); void <a href="#putimagedata" title= "dom-context-2d-putImageData">putImageData</a>(in <a href= "#imagedata">ImageData</a> imagedata, in float dx, in float dy); <del class= "diff-old"> // drawing text is not supported in this version of the API // (there is no way to predict what metrics the fonts will have, // which makes fonts very hard to use for painting) </del> <ins class="diff-chg"> void <a href="#putimagedata" title= "dom-context-2d-putImageData">putImageData</a>(in <a href= "#imagedata">ImageData</a> imagedata, in float dx, in float dy, in float dirtyX, in float dirtyY, in float dirtyWidth, in float dirtyHeight); </ins> }; interface <dfn id="canvasgradient">CanvasGradient</dfn> { // opaque object void <a href="#addcolorstop" title= "dom-canvasgradient-addColorStop">addColorStop</a>(in float offset, in DOMString color); }; interface <dfn id="canvaspattern">CanvasPattern</dfn> { // opaque object }; <ins class="diff-new">interface <dfn id= "textmetrics">TextMetrics</dfn> { readonly attribute float <a href="#width2" title= "dom-textmetrics-width">width</a>; }; </ins> interface <dfn id="imagedata">ImageData</dfn> { <del class="diff-old"> readonly attribute long int ; </del> <ins class="diff-chg"> readonly attribute long int <a href= "#width3" title="dom-imagedata-width">width</a>; </ins> readonly attribute long int <a href="#height2" title= "dom-imagedata-height">height</a>; readonly attribute int[] <a href="#data1" title= "dom-imagedata-data">data</a>; }; </pre> The <dfn id="canvas0" title= "dom-context-2d-canvas"><code>canvas</code></dfn> attribute must return the <code><a href="#canvas">canvas</a></code> element that the context paints on. <ins class="diff-new">Unless otherwise stated, for the 2D context interface, any method call with a numeric argument whose value is infinite or a NaN value must be ignored.</ins> <h6 id="the-canvas0"><del class= "diff-old">3.14.11.1.1.</del> <ins class= "diff-chg">3.12.11.1.1.</ins> The canvas state</h6> Each context maintains a stack of drawing states. <dfn id= "drawing0" title="drawing state">Drawing states</dfn> consist of: <ul class="brief"> <li>The current <a href="#transformations0" title= "dom-context-2d-transformation">transformation matrix</a> .</li> <li>The current <a href="#clipping">clipping <del class= "diff-old">path</del> <ins class="diff-chg">region</ins></a> .</li> <li>The current values of the following attributes: <code title= "dom-context-2d-strokeStyle"><a href= "#strokestyle">strokeStyle</a></code> , <code title= "dom-context-2d-fillStyle"><a href= "#fillstyle">fillStyle</a></code> , <code title= "dom-context-2d-globalAlpha"><a href= "#globalalpha">globalAlpha</a></code> , <code title= "dom-context-2d-lineWidth"><a href= "#linewidth">lineWidth</a></code> , <code title= "dom-context-2d-lineCap"><a href="#linecap">lineCap</a></code> , <code title="dom-context-2d-lineJoin"><a href= "#linejoin">lineJoin</a></code> , <code title= "dom-context-2d-miterLimit"><a href= "#miterlimit">miterLimit</a></code> , <code title= "dom-context-2d-shadowOffsetX"><a href= "#shadowoffsetx">shadowOffsetX</a></code> , <code title= "dom-context-2d-shadowOffsetY"><a href= "#shadowoffsety">shadowOffsetY</a></code> , <code title= "dom-context-2d-shadowBlur"><a href= "#shadowblur">shadowBlur</a></code> , <code title= "dom-context-2d-shadowColor"><a href= "#shadowcolor">shadowColor</a></code> , <code title= "dom-context-2d-globalCompositeOperation"><a href= "#globalcompositeoperation">globalCompositeOperation</a></code> , <code title="dom-context-2d-font"><a href="#font"><ins class= "diff-new">font</ins></a></code> ,<code title= "dom-context-2d-textAlign"><a href="#textalign"><ins class= "diff-new">textAlign</ins></a></code> ,<code title= "dom-context-2d-textBaseline"><a href="#textbaseline"><ins class= "diff-new">textBaseline</ins></a></code> .</li> </ul> The current path and the current bitmap are not part of the drawing state. The current path is persistent, and can only be reset using the <code title= "dom-context-2d-beginPath"><a href= "#beginpath">beginPath()</a></code> method. The current bitmap is a property of the canvas , not the context. The <dfn id="save" title= "dom-context-2d-save"><code>save()</code></dfn> method must push a copy of the current drawing state onto the drawing state stack. The <dfn id="restore" title= "dom-context-2d-restore"><code>restore()</code></dfn> method must pop the top entry in the drawing state stack, and reset the drawing state it describes. If there is no saved state, the method must do nothing. <h6 id="transformations"><del class= "diff-old">3.14.11.1.2.</del> <ins class= "diff-chg">3.12.11.1.2.</ins> <dfn id="transformations0" title="dom-context-2d-transformation">Transformations</dfn></h6> The transformation matrix is applied to coordinates when creating shapes and paths. When the context is created, the transformation matrix must initially be the identity transform. It may then be adjusted using the transformation methods. The <del class="diff-old">transformation matrix can become infinite, at which point nothing is drawn anymore. The</del> transformations must be performed in reverse order. For instance, if a scale transformation that doubles the width is applied, followed by a rotation transformation that rotates drawing operations by a quarter turn, and a rectangle twice as wide as it is tall is then drawn on the canvas, the actual result will be a square. The <dfn id="scale" title="dom-context-2d-scale"><code>scale( <var title="">x</var> , <var title="">y</var> )</code></dfn> method must add the scaling transformation described by the arguments to the transformation matrix. The <var title="">x</var> argument represents the scale factor in the horizontal direction and the <var title="">y</var> argument represents the scale factor in the vertical direction. The factors are multiples. <del class= "diff-old">If either argument is Infinity the transformation matrix must be marked as infinite instead of the method throwing an exception.</del> The <dfn id="rotate" title="dom-context-2d-rotate"><code>rotate( <var title="">angle</var> )</code></dfn> method must add the rotation transformation described by the argument to the transformation matrix. The <var title="">angle</var> argument represents a clockwise rotation angle expressed in radians. <ins class="diff-new">If the</ins> <var title=""><ins class= "diff-new">angle</ins></var> <ins class="diff-new">argument is infinite, the method call must be ignored.</ins> The <dfn id="translate" title= "dom-context-2d-translate"><code>translate( <var title="">x</var> , <var title="">y</var> )</code></dfn> method must add the translation transformation described by the arguments to the transformation matrix. The <var title="">x</var> argument represents the translation distance in the horizontal direction and the <var title="">y</var> argument represents the translation distance in the vertical direction. The arguments are in coordinate space units. <del class="diff-old">If either argument is Infinity the transformation matrix must be marked as infinite instead of the method throwing an exception.</del> The <dfn id="transform" title= "dom-context-2d-transform"><code>transform( <var title="">m11</var> , <var title="">m12</var> , <var title="">m21</var> , <var title= "">m22</var> , <var title="">dx</var> , <var title="">dy</var> )</code></dfn> method must multiply the current transformation matrix with the matrix described by: <table class="matrix"> <tbody> <tr> <td><var title="">m11</var></td> <td><var title="">m21</var></td> <td><var title="">dx</var></td> </tr> <tr> <td><var title="">m12</var></td> <td><var title="">m22</var></td> <td><var title="">dy</var></td> </tr> <tr> <td>0</td> <td>0</td> <td>1</td> </tr> </tbody> </table> <del class="diff-old">If any of the arguments are Infinity the transformation matrix must be marked as infinite instead of the method throwing an exception.</del> The <dfn id="settransform" title="dom-context-2d-setTransform"><code>setTransform( <var title= "">m11</var> , <var title="">m12</var> , <var title="">m21</var> , <var title="">m22</var> , <var title="">dx</var> , <var title= "">dy</var> )</code></dfn> method must reset the current transform to the identity matrix, and then invoke the <code><a href= "#transform" title="dom-context-2d-transform">transform</a> ( <var title="">m11</var> , <var title="">m12</var> , <var title= "">m21</var> , <var title="">m22</var> , <var title="">dx</var> , <var title="">dy</var> )</code> method with the same arguments. <del class="diff-old">If any of the arguments are Infinity the transformation matrix must be marked as infinite instead of the method throwing an exception.</del> <h6 id="compositing"><del class= "diff-old">3.14.11.1.3.</del> <ins class= "diff-chg">3.12.11.1.3.</ins> Compositing</h6> All drawing operations are affected by the global compositing attributes, <code title="dom-context-2d-globalAlpha"><a href= "#globalalpha">globalAlpha</a></code> and <code title= "dom-context-2d-globalCompositeOperation"><a href= "#globalcompositeoperation">globalCompositeOperation</a></code> . The <dfn id="globalalpha" title= "dom-context-2d-globalAlpha"><code>globalAlpha</code></dfn> attribute gives an alpha value that is applied to shapes and images before they are composited onto the canvas. The value must be in the range from 0.0 (fully transparent) to 1.0 (no additional transparency). If an attempt is made to set the attribute to a value outside this range, the attribute must retain its previous value. When the context is created, the <code title= "dom-context-2d-globalAlpha"><a href= "#globalalpha">globalAlpha</a></code> attribute must initially have the value 1.0. The <dfn id="globalcompositeoperation" title= "dom-context-2d-globalCompositeOperation"><code>globalCompositeOperation</code></dfn> attribute sets how shapes and images are drawn onto the existing bitmap, once they have had <code title= "dom-context-2d-globalAlpha"><a href= "#globalalpha">globalAlpha</a></code> and the current transformation matrix applied. It must be set to a value from the following list. In the descriptions below, the source image, <var title="">A</var> , is the shape or image being rendered, and the destination image, <var title="">B</var> , is the current state of the bitmap. <dl> <dt><dfn id="source-atop" title= "gcop-source-atop"><code>source-atop</code></dfn></dt> <dd><var title="">A</var> atop <var title="">B</var> . Display the source image wherever both images are opaque. Display the destination image wherever the destination image is opaque but the source image is transparent. Display transparency elsewhere.</dd> <dt><dfn id="source-in" title= "gcop-source-in"><code>source-in</code></dfn></dt> <dd><var title="">A</var> in <var title="">B</var> . Display the source image wherever both the source image and destination image are opaque. Display transparency elsewhere.</dd> <dt><dfn id="source-out" title= "gcop-source-out"><code>source-out</code></dfn></dt> <dd><var title="">A</var> out <var title="">B</var> . Display the source image wherever the source image is opaque and the destination image is transparent. Display transparency elsewhere.</dd> <dt><dfn id="source-over" title= "gcop-source-over"><code>source-over</code></dfn> (default)</dt> <dd><var title="">A</var> over <var title="">B</var> . Display the source image wherever the source image is opaque. Display the destination image elsewhere.</dd> <dt><dfn id="destination-atop" title= "gcop-destination-atop"><code>destination-atop</code></dfn></dt> <dd><var title="">B</var> atop <var title="">A</var> . Same as <code title="gcop-source-atop"><a href= "#source-atop">source-atop</a></code> but using the destination image instead of the source image and vice versa.</dd> <dt><dfn id="destination-in" title= "gcop-destination-in"><code>destination-in</code></dfn></dt> <dd><var title="">B</var> in <var title="">A</var> . Same as <code title="gcop-source-in"><a href= "#source-in">source-in</a></code> but using the destination image instead of the source image and vice versa.</dd> <dt><dfn id="destination-out" title= "gcop-destination-out"><code>destination-out</code></dfn></dt> <dd><var title="">B</var> out <var title="">A</var> . Same as <code title="gcop-source-out"><a href= "#source-out">source-out</a></code> but using the destination image instead of the source image and vice versa.</dd> <dt><dfn id="destination-over" title= "gcop-destination-over"><code>destination-over</code></dfn></dt> <dd><var title="">B</var> over <var title="">A</var> . Same as <code title="gcop-source-over"><a href= "#source-over">source-over</a></code> but using the destination image instead of the source image and vice versa.</dd> <dt><dfn id="lighter" title= "gcop-lighter"><code>lighter</code></dfn></dt> <dd><var title="">A</var> plus <var title="">B</var> . Display the sum of the source image and destination image, with color values approaching 1 as a limit.</dd> <dt><dfn id="copy" title="gcop-copy"><code>copy</code></dfn></dt> <dd><var title="">A</var> ( <var title="">B</var> is ignored). Display the source image instead of the destination image.</dd> <dt><dfn id="xor" title="gcop-xor"><code>xor</code></dfn></dt> <dd><var title="">A</var> xor <var title="">B</var> . Exclusive OR of the source image and destination image.</dd> <dt><code><var title="">vendorName</var> - <var title= "">operationName</var></code></dt> <dd>Vendor-specific extensions to the list of composition operators should use this syntax.</dd> </dl> These values are all case-sensitive — they must be used exactly as shown. User agents must <del class="diff-old">only recognise</del> <ins class="diff-chg">not recognize</ins> values that <ins class="diff-new">do not</ins> exactly match the values given above. The operators in the above list must be treated as described by the Porter-Duff operator given at the start of their description (e.g. <var title="">A</var> over <var title="">B</var> ). <a href= "#references">[PORTERDUFF]</a> On setting, if the user agent does not <del class= "diff-old">recognise</del> <ins class="diff-chg">recognize</ins> the specified value, it must be ignored, leaving the value of <code title="dom-context-2d-globalCompositeOperation"><a href= "#globalcompositeoperation">globalCompositeOperation</a></code> unaffected. When the context is created, the <code title= "dom-context-2d-globalCompositeOperation"><a href= "#globalcompositeoperation">globalCompositeOperation</a></code> attribute must initially have the value <code>source-over</code> . <h6 id="colors"><del class= "diff-old">3.14.11.1.4.</del> <ins class= "diff-chg">3.12.11.1.4.</ins> Colors and styles</h6> The <dfn id="strokestyle" title= "dom-context-2d-strokeStyle"><code>strokeStyle</code></dfn> attribute represents the color or style to use for the lines around shapes, and the <dfn id="fillstyle" title= "dom-context-2d-fillStyle"><code>fillStyle</code></dfn> attribute represents the color or style to use inside the shapes. Both attributes can be either strings, <code><a href= "#canvasgradient0">CanvasGradient</a></code> s, or <code><a href= "#canvaspattern0">CanvasPattern</a></code> s. On setting, strings must be parsed as CSS <color> values and the color assigned, and <code><a href="#canvasgradient0">CanvasGradient</a></code> and <code><a href="#canvaspattern0">CanvasPattern</a></code> objects must be assigned themselves. <a href="#references">[CSS3COLOR]</a> If the value is a string but is not a valid color, or is neither a string, a <code><a href= "#canvasgradient0">CanvasGradient</a></code> , nor a <code><a href= "#canvaspattern0">CanvasPattern</a></code> , then it must be ignored, and the attribute must retain its previous value. On getting, if the value is a color, then the <del class= "diff-old">serialisation</del> <a href="#serialization" title= "serialization of a color"><ins class= "diff-chg">serialization</ins> of the color</a> must be returned. Otherwise, if it is not a color but a <code><a href= "#canvasgradient0">CanvasGradient</a></code> or <code><a href= "#canvaspattern0">CanvasPattern</a></code> , then the respective object must be returned. (Such objects are opaque and therefore only useful for assigning to other attributes or for comparison to other gradients or patterns.) The <del class="diff-old">serialisation</del> <dfn id= "serialization"><ins class="diff-chg">serialization</ins> of a color</dfn> for a color value is a string, computed as follows: if it has alpha equal to 1.0, then the string is a lowercase six-digit hex value, prefixed with a "#" character (U+0023 NUMBER SIGN), with the first two digits representing the red component, the next two digits representing the green component, and the last two digits representing the blue component, the digits being in the range 0-9 a-f (U+0030 to U+0039 and U+0061 to U+0066). Otherwise, the color value has alpha less than 1.0, and the string is the color value in the CSS <code title="">rgba()</code> functional-notation format: the literal string <code title="">rgba</code> (U+0072 U+0067 U+0062 U+0061) followed by a U+0028 LEFT PARENTHESIS, a base-ten integer in the range 0-255 representing the red component (using digits 0-9, U+0030 to U+0039, in the shortest form possible), a literal U+002C COMMA and U+0020 SPACE, an integer for the green component, a comma and a space, an integer for the blue component, another comma and space, a U+0030 DIGIT ZERO, a U+002E FULL STOP (representing the decimal point), one or more digits in the range 0-9 (U+0030 to U+0039) representing the fractional part of the alpha value, and finally a U+0029 RIGHT PARENTHESIS. When the context is created, the <code title= "dom-context-2d-strokeStyle"><a href= "#strokestyle">strokeStyle</a></code> and <code title= "dom-context-2d-fillStyle"><a href= "#fillstyle">fillStyle</a></code> attributes must initially have the string value <code title="">#000000</code> . There are two types of gradients, linear gradients and radial gradients, both represented by objects implementing the opaque <dfn id="canvasgradient0"><code>CanvasGradient</code></dfn> interface. Once a gradient has been created (see below), stops are placed along it to define how the colors are distributed along the gradient. The color of the gradient at each stop is the color specified for that stop. Between each such stop, the colors and the alpha component must be linearly interpolated over the RGBA space without premultiplying the alpha value to find the color to use at that offset. Before the first stop, the color must be the color of the first stop. After the last stop, the color must be the color of the last stop. When there are no stops, the gradient is transparent black. The <dfn id="addcolorstop" title= "dom-canvasgradient-addColorStop"><code>addColorStop( <var title= "">offset</var> , <var title="">color</var> )</code></dfn> method on the <code><a href="#canvasgradient0">CanvasGradient</a></code> interface adds a new stop to a gradient. If the <var title= "">offset</var> is less than <del class="diff-old">0 or</del> <ins class="diff-chg">0,</ins> greater than <del class= "diff-old">1</del> <ins class="diff-chg">1, infinite, or NaN,</ins> then an <code>INDEX_SIZE_ERR</code> exception must be raised. If the <var title="">color</var> cannot be parsed as a CSS color, then a <code>SYNTAX_ERR</code> exception must be raised. Otherwise, the gradient must have a new stop placed, at offset <var title= "">offset</var> relative to the whole gradient, and with the color obtained by parsing <var title="">color</var> as a CSS <color> value. If multiple stops are added at the same offset on a gradient, they must be placed in the order added, with the first one closest to the start of the gradient, and each subsequent one infinitesimally further along towards the end point (in effect causing all but the first and last stop added at each point to be ignored). The <dfn id="createlineargradient" title= "dom-context-2d-createLinearGradient"><code>createLinearGradient( <var title="">x0</var> , <var title="">y0</var> , <var title= "">x1</var> , <var title="">y1</var> )</code></dfn> method takes four <del class="diff-old">arguments, representing</del> <ins class="diff-chg">arguments that, after being subjected to the</ins> <a href="#transformations0" title= "dom-context-2d-transformation"><ins class="diff-chg">current transformation matrix</ins></a> ,<ins class= "diff-chg">represent</ins> the start point ( <var title="">x0</var> , <var title="">y0</var> ) and end point ( <var title="">x1</var> , <var title="">y1</var> ) of the <del class="diff-old">gradient, in coordinate space units, and</del> <ins class="diff-chg">gradient. If any of the arguments to</ins> <code title= "dom-context-2d-createLinearGradient"><a href= "#createlineargradient"><ins class= "diff-chg">createLinearGradient()</ins></a></code> <ins class= "diff-chg">are infinite or NaN, the method must raise an</ins> <code><ins class="diff-chg">INDEX_SIZE_ERR</ins></code> <ins class= "diff-chg">exception. Otherwise, the method</ins> must return a linear <code><a href="#canvasgradient0">CanvasGradient</a></code> <del class="diff-old">initialised</del> <ins class= "diff-chg">initialized</ins> with <del class="diff-old">that</del> <ins class="diff-chg">the specified</ins> line. Linear gradients must be rendered such that at and before the starting point on the canvas the color at offset 0 is used, that at and after the ending point the color at offset 1 is used, and that all points on a line perpendicular to the line that crosses the start and end points have the color at the point where those two lines cross (with the colors coming from the interpolation described above). If <var title="">x 0</var>  =  <var title="">x 1</var> and <var title="">y 0</var>  =  <var title="">y 1</var> , then the linear gradient must paint nothing. The <dfn id="createradialgradient" title= "dom-context-2d-createRadialGradient"><code>createRadialGradient( <var title="">x0</var> , <var title="">y0</var> , <var title= "">r0</var> , <var title="">x1</var> , <var title="">y1</var> , <var title="">r1</var> )</code></dfn> method takes six arguments, the first three representing the start circle with origin ( <var title="">x0</var> , <var title="">y0</var> ) and radius <var title="">r0</var> , and the last three representing the end circle with origin ( <var title="">x1</var> , <var title= "">y1</var> ) and radius <var title="">r1</var> . The values are in coordinate space units. <del class="diff-old">The method must return a radial CanvasGradient initialised with those two circles.</del> If either of <var title="">r0</var> or <var title= "">r1</var> are negative, <ins class="diff-new">or if any of the arguments are infinite or NaN,</ins> an <code>INDEX_SIZE_ERR</code> exception must be raised. <ins class="diff-new">Otherwise, the method must return a radial</ins> <code><a href= "#canvasgradient0"><ins class= "diff-new">CanvasGradient</ins></a></code> <ins class= "diff-new">initialized with the two specified circles, after transforming them according to the</ins> <a href= "#transformations0" title= "dom-context-2d-transformation"><ins class="diff-new">current transformation matrix</ins></a> . Radial gradients must be rendered by following these steps: <ol> <li> <ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">x</ins> <ins class="diff-new">0</ins></var> <ins class="diff-new"> = </ins> <var title=""><ins class= "diff-new">x</ins> <ins class= "diff-new">1</ins></var> <ins class= "diff-new">and</ins> <var title=""><ins class= "diff-new">y</ins> <ins class="diff-new">0</ins></var> <ins class="diff-new"> = </ins> <var title=""><ins class= "diff-new">y</ins> <ins class= "diff-new">1</ins></var> <ins class= "diff-new">and</ins> <var title=""><ins class= "diff-new">r</ins> <ins class="diff-new">0</ins></var> <ins class="diff-new"> = </ins> <var title=""><ins class= "diff-new">r</ins> <ins class= "diff-new">1</ins></var> ,<ins class="diff-new">then the radial gradient must paint nothing. Abort these steps.</ins> </li> <li> Let x( <var title="">ω</var> ) = ( <var title= "">x 1</var> - <var title="">x 0</var> ) <var title="">ω</var>  +  <var title="">x 0</var> Let y( <var title="">ω</var> ) = ( <var title= "">y 1</var> - <var title="">y 0</var> ) <var title="">ω</var>  +  <var title="">y 0</var> Let r( <var title="">ω</var> ) = ( <var title= "">r 1</var> - <var title="">r 0</var> ) <var title="">ω</var>  +  <var title="">r 0</var> Let the color at <var title="">ω</var> be the color of the gradient at offset 0.0 for all values of <var title="">ω</var> less than 0.0, the color at offset 1.0 for all values of <var title= "">ω</var> greater than 1.0, and the color at the given offset for values of <var title="">ω</var> in the range 0.0 ≤  <var title="">ω</var>  ≤ 1.0 </li> <li> For all values of <var title="">ω</var> where r( <var title="">ω</var> ) > 0 , starting with the value of <var title="">ω</var> nearest to positive infinity and ending with the value of <var title="">ω</var> nearest to negative infinity, draw the circumference of the circle with radius r( <var title="">ω</var> ) at position ( x( <var title= "">ω</var> ) , y( <var title="">ω</var> ) ), with the color at <var title="">ω</var> , but only painting on the parts of the canvas that have not yet been painted on by earlier circles in this step for this rendering of the gradient. </li> </ol> <del class="diff-old">If x 0  =  x 1 and y 0  =  y 1 and r 0  =  r 1 , then the radial gradient must paint nothing.</del> This effectively creates a cone, touched by the two circles defined in the creation of the gradient, with the part of the cone before the start circle (0.0) using the color of the first offset, the part of the cone after the end circle (1.0) using the color of the last offset, and areas outside the cone untouched by the gradient (transparent black). Gradients must <del class="diff-old">only</del> be painted <ins class="diff-new">only</ins> where the relevant stroking or filling effects requires that they be drawn. <del class= "diff-old">Support for actually painting gradients is optional. Instead of painting the gradients, user agents may instead just paint the first stop's color. However, createLinearGradient() and createRadialGradient() must always return objects when passed valid arguments.</del> Patterns are represented by objects implementing the opaque <dfn id="canvaspattern0"><code>CanvasPattern</code></dfn> interface. To create objects of this type, the <dfn id="createpattern" title="dom-context-2d-createPattern"><code><del class= "diff-old">createPattern(image, repetition)</del> <ins class= "diff-chg">createPattern(</ins> <var title=""><ins class= "diff-chg">image</ins></var> ,<var title=""><ins class= "diff-chg">repetition</ins></var> <ins class= "diff-chg">)</ins></code></dfn> method is used. The first argument gives the image to use as the pattern (either an <code><a href= "#htmlimageelement">HTMLImageElement</a></code> or an <code><a href="#htmlcanvaselement">HTMLCanvasElement</a></code> ). Modifying this image after calling the <code title= "dom-context-2d-createPattern"><a href= "#createpattern">createPattern()</a></code> method must not affect the pattern. The second argument must be a string with one of the following values: <code title="">repeat</code> , <code title= "">repeat-x</code> , <code title="">repeat-y</code> , <code title= "">no-repeat</code> . If the empty string or null is specified, <code title="">repeat</code> must be assumed. If an <del class= "diff-old">unrecognised</del> <ins class= "diff-chg">unrecognized</ins> value is given, then the user agent must raise a <code>SYNTAX_ERR</code> exception. User agents must <del class="diff-old">recognise</del> <ins class= "diff-chg">recognize</ins> the four values described above exactly (e.g. they must not do case folding). The method must return a <code><a href="#canvaspattern0">CanvasPattern</a></code> object suitably <del class="diff-old">initialised.</del> <ins class= "diff-chg">initialized.</ins> The <var title="">image</var> argument must be an instance of an <code><a href="#htmlimageelement">HTMLImageElement</a></code> or <code><a href="#htmlcanvaselement">HTMLCanvasElement</a></code> . If the <var title="">image</var> is of the wrong <del class= "diff-old">type,</del> <ins class="diff-chg">type or null,</ins> the implementation must raise a <code>TYPE_MISMATCH_ERR</code> exception. If the <var title="">image</var> argument is an <code><a href= "#htmlimageelement">HTMLImageElement</a></code> object whose <code title="dom-img-complete"><a href= "#complete">complete</a></code> attribute is false, then the implementation must raise an <code>INVALID_STATE_ERR</code> exception. <ins class="diff-new">If the</ins> <var title=""><ins class= "diff-new">image</ins></var> <ins class="diff-new">argument is an</ins> <code><a href="#htmlcanvaselement"><ins class= "diff-new">HTMLCanvasElement</ins></a></code> <ins class= "diff-new">object with either a horizontal dimension or a vertical dimension equal to zero, then the implementation must raise an</ins> <code><ins class="diff-new">INVALID_STATE_ERR</ins></code> <ins class="diff-new">exception.</ins> Patterns must be painted so that the top left of the first image is anchored at the origin of the coordinate space, and images are then repeated horizontally to the left and right (if the <code>repeat-x</code> string was specified) or vertically up and down (if the <code>repeat-y</code> string was specified) or in all four directions all over the canvas (if the <code>repeat</code> string was specified). The images are not <del class= "diff-old">be</del> scaled by this process; one CSS pixel of the image must be painted on one coordinate space unit. Of course, patterns must <del class="diff-old">only</del> actually <ins class= "diff-new">be</ins> painted <ins class="diff-new">only</ins> where the stroking or filling effect requires that they be drawn, and are affected by the current transformation matrix. <ins class="diff-new">When the</ins> <code title= "dom-context-2d-createPattern"><a href="#createpattern"><ins class= "diff-new">createPattern()</ins></a></code> <ins class= "diff-new">method is passed, as its</ins> <var title=""><ins class= "diff-new">image</ins></var> <ins class="diff-new">argument, an animated image, the poster frame of the animation, or the first frame of the animation if there is no poster frame, must be used.</ins> Support for patterns is optional. If the user agent doesn't support patterns, then <code title= "dom-context-2d-createPattern"><a href= "#createpattern">createPattern()</a></code> must return null. <h6 id="line-styles"><del class= "diff-old">3.14.11.1.5.</del> <ins class= "diff-chg">3.12.11.1.5.</ins> Line styles</h6> The <dfn id="linewidth" title= "dom-context-2d-lineWidth"><code>lineWidth</code></dfn> attribute gives the <del class="diff-old">default</del> width of lines, in coordinate space units. On setting, <del class= "diff-old">zero</del> <ins class="diff-chg">zero, negative, infinite,</ins> and <del class="diff-old">negative</del> <ins class="diff-chg">NaN</ins> values must be ignored, leaving the value unchanged. When the context is created, the <code title= "dom-context-2d-lineWidth"><a href= "#linewidth">lineWidth</a></code> attribute must initially have the value <code>1.0</code> . The <dfn id="linecap" title= "dom-context-2d-lineCap"><code>lineCap</code></dfn> attribute defines the type of endings that UAs <del class= "diff-old">shall</del> <ins class="diff-chg">will</ins> place on the end of lines. The three valid values are <code>butt</code> , <code>round</code> , and <code>square</code> . The <code>butt</code> value means that the end of each line is a flat edge perpendicular to the direction of the line. The <code>round</code> value means that a semi-circle with the diameter equal to the width of the line <del class="diff-old">is</del> <ins class="diff-chg">must</ins> then <ins class= "diff-new">be</ins> added on to the end of the line. The <code>square</code> value means that <del class="diff-old">at the end of each line is</del> a rectangle with the length of the line width and the width of half the line width, placed flat against the edge perpendicular to the direction of the <ins class= "diff-new">line, must be added at the end of each</ins> line. On setting, any other value than the literal strings <code>butt</code> , <code>round</code> , and <code>square</code> must be ignored, leaving the value unchanged. When the context is created, the <code title= "dom-context-2d-lineCap"><a href="#linecap">lineCap</a></code> attribute must initially have the value <code>butt</code> . The <dfn id="linejoin" title= "dom-context-2d-lineJoin"><code>lineJoin</code></dfn> attribute defines the type of corners that <del class="diff-old">that</del> UAs will place where two lines meet. The three valid values are <code><del class="diff-old">round</del> <ins class= "diff-chg">bevel</ins></code> , <code><del class= "diff-old">bevel</del> <ins class="diff-chg">round</ins></code> , and <code>miter</code> . On setting, any other value than the literal strings <code><del class="diff-old">round</del> <ins class= "diff-chg">bevel</ins></code> , <code><del class= "diff-old">bevel</del> <ins class="diff-chg">round</ins></code> , and <code>miter</code> must be ignored, leaving the value unchanged. When the context is created, the <code title= "dom-context-2d-lineJoin"><a href="#linejoin">lineJoin</a></code> attribute must initially have the value <code>miter</code> . <del class="diff-old">The round value means that</del> <ins class="diff-chg">A join exists at any point in</ins> a <del class="diff-old">filled arc</del> <ins class= "diff-chg">subpath shared by two consecutive lines. When a subpath is closed, then a join also exists at its first point (equivalent to its last point)</ins> connecting the <del class= "diff-old">corners on</del> <ins class="diff-chg">first and last lines in</ins> the <del class="diff-old">outside of</del> <ins class="diff-chg">subpath.</ins> <ins class="diff-chg">In addition to</ins> the <del class= "diff-old">join, with</del> <ins class="diff-chg">point where</ins> the <del class="diff-old">diameter equal</del> <ins class= "diff-chg">join occurs, two additional points are relevant</ins> to <ins class="diff-new">each join, one for each line: the two corners found half</ins> the line <del class="diff-old">width, and</del> <ins class="diff-chg">width away from</ins> the <del class= "diff-old">origin at</del> <ins class="diff-chg">join point, one perpendicular to each line, each on</ins> the <del class= "diff-old">point where</del> <ins class="diff-chg">side furthest from</ins> the <del class="diff-old">inside edges</del> <ins class= "diff-chg">other line.</ins> <ins class="diff-chg">A filled triangle connecting these two opposite corners with a straight line, with the third point</ins> of the <del class="diff-old">lines touch,</del> <ins class= "diff-chg">triangle being the join point,</ins> must be rendered at <ins class="diff-new">all</ins> joins. The <code title= "dom-context-2d-lineJoin"><a href="#linejoin"><ins class= "diff-new">lineJoin</ins></a></code> <ins class= "diff-new">attribute controls whether anything else is rendered. The three aforementioned values have the following meanings:</ins> <ins class="diff-new">The</ins> <code>bevel</code> value means that <ins class="diff-new">this is all that is rendered at joins.</ins> <ins class="diff-new">The</ins> <code><ins class= "diff-new">round</ins></code> <ins class="diff-new">value means that</ins> a filled <del class="diff-old">triangle</del> <ins class="diff-chg">arc</ins> connecting <del class= "diff-old">those</del> <ins class="diff-chg">the</ins> two <ins class="diff-new">aforementioned</ins> corners <del class= "diff-old">with a straight line, the third point</del> of the <del class="diff-old">triangle being</del> <ins class= "diff-chg">join, abutting (and not overlapping)</ins> the <del class="diff-old">point where</del> <ins class= "diff-chg">aforementioned triangle, with</ins> the <del class= "diff-old">lines touch on</del> <ins class="diff-chg">diameter equal to</ins> the <del class="diff-old">inside</del> <ins class= "diff-chg">line width and the origin at the point</ins> of the join, must be rendered at joins. The <code>miter</code> value means that a <ins class= "diff-new">second</ins> filled <del class="diff-old">four- or five-sided polygon</del> <ins class="diff-chg">triangle</ins> must <ins class="diff-new">(if it can given the miter length)</ins> be <del class="diff-old">placed</del> <ins class= "diff-chg">rendered</ins> at the join, with <del class= "diff-old">two of the lines</del> <ins class="diff-chg">one line</ins> being the <del class="diff-old">perpendicular edges of</del> <ins class="diff-chg">line between</ins> the <del class= "diff-old">joining lines,</del> <ins class="diff-chg">two aforementioned corners, abutting the first triangle,</ins> and the other two being continuations of the outside edges of the two joining lines, as long as required to intersect without going over the miter <del class="diff-old">limit.</del> <ins class= "diff-chg">length.</ins> The miter length is the distance from the point where the lines touch on the inside of the join to the intersection of the line edges on the outside of the join. The miter limit ratio is the maximum allowed ratio of the <del class="diff-old">miter</del> length <ins class="diff-new">of the two continuation lines</ins> to the line width. If the miter <del class="diff-old">limit</del> <ins class="diff-chg">length</ins> would be exceeded, <del class= "diff-old">then a fifth line</del> <ins class="diff-chg">this second triangle</ins> must <ins class="diff-new">not</ins> be <del class="diff-old">added to the polygon, connecting the two outside lines, such that the distance from the inside point of the join to the point in the middle of this fifth line is the maximum allowed value for the miter length.</del> <ins class= "diff-chg">rendered.</ins> The miter limit ratio can be explicitly set using the <dfn id= "miterlimit" title= "dom-context-2d-miterLimit"><code>miterLimit</code></dfn> attribute. On setting, <del class="diff-old">zero</del> <ins class= "diff-chg">zero, negative, infinite,</ins> and <del class= "diff-old">negative</del> <ins class="diff-chg">NaN</ins> values must be ignored, leaving the value unchanged. When the context is created, the <code title= "dom-context-2d-miterLimit"><a href= "#miterlimit">miterLimit</a></code> attribute must initially have the value <code>10.0</code> . <h6 id="shadows"><del class= "diff-old">3.14.11.1.6.</del> <ins class= "diff-chg">3.12.11.1.6.</ins> <dfn id= "shadows0">Shadows</dfn></h6> All drawing operations are affected by the four global shadow attributes. The <dfn id="shadowcolor" title= "dom-context-2d-shadowColor"><code>shadowColor</code></dfn> attribute sets the color of the shadow. When the context is created, the <code title= "dom-context-2d-shadowColor"><a href= "#shadowcolor">shadowColor</a></code> attribute initially must be fully-transparent black. On getting, the <del class="diff-old">serialisation</del> <a href="#serialization" title= "serialization of a color"><ins class= "diff-chg">serialization</ins> of the color</a> must be returned. On setting, the new value must be parsed as a CSS <color> value and the color assigned. If the value is not a valid color, then it must be ignored, and the attribute must retain its previous value. <a href="#references">[CSS3COLOR]</a> The <dfn id="shadowoffsetx" title= "dom-context-2d-shadowOffsetX"><code>shadowOffsetX</code></dfn> and <dfn id="shadowoffsety" title= "dom-context-2d-shadowOffsetY"><code>shadowOffsetY</code></dfn> attributes specify the distance that the shadow will be offset in the positive horizontal and positive vertical distance respectively. Their values are in coordinate space units. They are not affected by the current transformation matrix. When the context is created, the shadow offset attributes initially have the value <code>0</code> . On getting, they must return their current value. On setting, the attribute being set must be set to the new <del class= "diff-old">value.</del> <ins class="diff-chg">value, except if the value is infinite or NaN, in which case the new value must be ignored.</ins> The <dfn id="shadowblur" title= "dom-context-2d-shadowBlur"><code>shadowBlur</code></dfn> attribute specifies the size of the blurring effect. (The units do not map to coordinate space units, and are not affected by the current transformation matrix.) When the context is created, the <code title= "dom-context-2d-shadowBlur"><a href= "#shadowblur">shadowBlur</a></code> attribute must initially have the value <code>0</code> . On getting, the attribute must return its current value. On <del class="diff-old">setting, if the value is greater than or equal to zero, then</del> <ins class="diff-chg">setting</ins> the attribute must be set to the new <del class="diff-old">value; otherwise,</del> <ins class="diff-chg">value, except if</ins> the <del class="diff-old">new</del> value is <ins class= "diff-new">negative, infinite or NaN, in which case the new value must be</ins> ignored. Support for shadows is optional. When they are supported, then, when shadows are drawn, they must be rendered as follows: <ol> <li> Let <var title="">A</var> be the source image for which a shadow is being created. </li> <li> Let <var title="">B</var> be an infinite transparent black bitmap, with a coordinate space and an origin identical to <var title="">A</var> . </li> <li> Copy the alpha channel of <var title="">A</var> to <var title= "">B</var> , offset by <code title= "dom-context-2d-shadowOffsetX"><a href= "#shadowoffsetx">shadowOffsetX</a></code> in the positive <var title="">x</var> direction, and <code title= "dom-context-2d-shadowOffsetY"><a href= "#shadowoffsety">shadowOffsetY</a></code> in the positive <var title="">y</var> direction. </li> <li> If <code title="dom-context-2d-shadowBlur"><a href= "#shadowblur">shadowBlur</a></code> is greater than 0: <ol> <li> If <code title="dom-context-2d-shadowBlur"><a href= "#shadowblur">shadowBlur</a></code> is less than 8, let <var title= "">σ</var> be half the value of <code title= "dom-context-2d-shadowBlur"><a href= "#shadowblur">shadowBlur</a></code> ; otherwise, let <var title= "">σ</var> be the square root of multiplying the value of <code title="dom-context-2d-shadowBlur"><a href= "#shadowblur">shadowBlur</a></code> by 2. </li> <li> Perform a 2D Gaussian Blur on <var title="">B</var> , using <var title="">σ</var> as the standard deviation. </li> </ol> User agents may limit values of <var title="">σ</var> to an implementation-specific maximum value to avoid exceeding hardware limitations during the Gaussian blur operation. </li> <li> Set the red, green, and blue components of every pixel in <var title="">B</var> to the red, green, and blue components (respectively) of the color of <code title= "dom-context-2d-shadowColor"><a href= "#shadowcolor">shadowColor</a></code> . </li> <li> Multiply the alpha component of every pixel in <var title= "">B</var> by the alpha component of the color of <code title= "dom-context-2d-shadowColor"><a href= "#shadowcolor">shadowColor</a></code> . </li> <li> The shadow is in the bitmap <var title="">B</var> , and is rendered as part of the drawing model described below. </li> </ol> <h6 id="simple"><del class= "diff-old">3.14.11.1.7.</del> <ins class= "diff-chg">3.12.11.1.7.</ins> Simple shapes (rectangles)</h6> There are three methods that immediately draw rectangles to the bitmap. They each take four arguments; the first two give the <var title="">x</var> and <var title="">y</var> coordinates of the top left of the rectangle, and the second two give the width <var title="">w</var> and height <var title="">h</var> of the rectangle, respectively. The <a href="#transformations0" title= "dom-context-2d-transformation">current transformation matrix</a> must be applied to the following four coordinates, which form the path that must then be closed to get the specified rectangle: ( <var title="">x</var> , <var title="">y</var> ) , ( <var title="">x</var> + <var title="">w</var> , <var title="">y</var> ) , ( <var title= "">x</var> + <var title="">w</var> , <var title= "">y</var> + <var title="">h</var> ) , ( <var title="">x</var> , <var title="">y</var> + <var title= "">h</var> ) . Shapes are painted without affecting the current path, and are subject to <ins class="diff-chg">the</ins> <a href="#clipping" title="clipping region">clipping <del class="diff-old">paths</del> <ins class="diff-chg">region</ins></a> , and, with the exception of <code title="dom-context-2d-clearRect"><a href= "#clearrect">clearRect()</a></code> , also <a href="#shadows0" title="shadows">shadow effects</a> , <a href="#globalalpha" title= "dom-context-2d-globalAlpha">global alpha</a> , and <a href= "#globalcompositeoperation" title= "dom-context-2d-globalCompositeOperation">global composition operators</a> . <del class="diff-old">Negative values for width and height must cause the implementation to raise an INDEX_SIZE_ERR exception.</del> The <dfn id="clearrect" title= "dom-context-2d-clearRect"><code><del class= "diff-old">clearRect()</del> <ins class="diff-chg">clearRect(</ins> <var title=""><ins class="diff-chg">x</ins></var> ,<var title= ""><ins class="diff-chg">y</ins></var> ,<var title=""><ins class= "diff-chg">w</ins></var> ,<var title=""><ins class= "diff-chg">h</ins></var> <ins class="diff-chg">)</ins></code></dfn> method must clear the pixels in the specified rectangle that also intersect the current clipping <del class="diff-old">path</del> <ins class="diff-chg">region</ins> to a fully transparent black, erasing any previous image. If either height or width are zero, this method has no effect. The <dfn id="fillrect" title= "dom-context-2d-fillRect"><code><del class= "diff-old">fillRect()</del> <ins class="diff-chg">fillRect(</ins> <var title=""><ins class="diff-chg">x</ins></var> ,<var title= ""><ins class="diff-chg">y</ins></var> ,<var title=""><ins class= "diff-chg">w</ins></var> ,<var title=""><ins class= "diff-chg">h</ins></var> <ins class="diff-chg">)</ins></code></dfn> method must paint the specified rectangular area using the <code title="dom-context-2d-fillStyle"><a href= "#fillstyle">fillStyle</a></code> . If either height or width are zero, this method has no effect. The <dfn id="strokerect" title= "dom-context-2d-strokeRect"><code><del class= "diff-old">strokeRect()</del> <ins class= "diff-chg">strokeRect(</ins> <var title=""><ins class= "diff-chg">x</ins></var> ,<var title=""><ins class= "diff-chg">y</ins></var> ,<var title=""><ins class= "diff-chg">w</ins></var> ,<var title=""><ins class= "diff-chg">h</ins></var> <ins class="diff-chg">)</ins></code></dfn> method must stroke the specified rectangle's path using the <code title="dom-context-2d-strokeStyle"><a href= "#strokestyle">strokeStyle</a></code> , <code title= "dom-context-2d-lineWidth"><a href= "#linewidth">lineWidth</a></code> , <code title= "dom-context-2d-lineJoin"><a href="#linejoin">lineJoin</a></code> , and (if appropriate) <code title= "dom-context-2d-miterLimit"><a href= "#miterlimit">miterLimit</a></code> attributes. If both height and width are zero, this method has no effect, since there is no path to stroke (it's a point). If only one of the two is zero, then the method will draw a line instead (the path for the outline is just a straight line along the non-zero dimension). <h6 id="complex"><del class= "diff-old">3.14.11.1.8.</del> <ins class= "diff-chg">3.12.11.1.8.</ins> Complex shapes (paths)</h6> The context always has a current path. There is only one current path, it is not part of the drawing state . A <dfn id="path">path</dfn> has a list of zero or more subpaths. Each subpath consists of a list of one or more points, connected by straight or curved lines, and a flag indicating whether the subpath is closed or not. A closed subpath is one where the last point of the subpath is connected to the first point of the subpath by a straight line. Subpaths with fewer than two points are ignored when painting the path. Initially, the context's path must have zero subpaths. The <del class="diff-old">coordinates given in the arguments</del> <ins class="diff-chg">points and lines added</ins> to <ins class="diff-new">the path by</ins> these methods must be transformed according to the <a href="#transformations0" title= "dom-context-2d-transformation">current transformation matrix</a> <del class="diff-old">before applying the calculations described below and before adding any points to the path.</del> <ins class= "diff-chg">as they are added.</ins> The <dfn id="beginpath" title= "dom-context-2d-beginPath"><code>beginPath()</code></dfn> method must empty the list of subpaths so that the context once again has zero subpaths. The <dfn id="moveto" title="dom-context-2d-moveTo"><code>moveTo( <var title="">x</var> , <var title="">y</var> )</code></dfn> method must create a new subpath with the specified point as its first (and only) point. The <dfn id="closepath" title= "dom-context-2d-closePath"><code>closePath()</code></dfn> method must do nothing if the context has no subpaths. Otherwise, it must mark the last subpath as closed, create a new subpath whose first point is the same as the previous subpath's first point, and finally add this new subpath to the path. (If the last subpath had more than one point in its list of points, then this is equivalent to adding a straight line connecting the last point back to the first point, thus "closing" the shape, and then repeating the last <code title="dom-context-2d-moveTo"><a href= "#moveto">moveTo()</a></code> call.) New points and the lines connecting them are added to subpaths using the methods described below. In all cases, the methods only modify the last subpath in the context's paths. The <dfn id="lineto" title="dom-context-2d-lineTo"><code>lineTo( <var title="">x</var> , <var title="">y</var> )</code></dfn> method must do nothing if the context has no subpaths. Otherwise, it must connect the last point in the subpath to the given point ( <var title="">x</var> , <var title="">y</var> ) using a straight line, and must then add the given point ( <var title="">x</var> , <var title="">y</var> ) to the subpath. The <dfn id="quadraticcurveto" title= "dom-context-2d-quadraticCurveTo"><code>quadraticCurveTo( <var title="">cpx</var> , <var title="">cpy</var> , <var title= "">x</var> , <var title="">y</var> )</code></dfn> method must do nothing if the context has no subpaths. Otherwise it must connect the last point in the subpath to the given point ( <var title= "">x</var> , <var title="">y</var> ) using a quadratic Bézier curve with control point ( <var title="">cpx</var> , <var title= "">cpy</var> ), and must then add the given point ( <var title= "">x</var> , <var title="">y</var> ) to the subpath. <a href= "#references">[BEZIER]</a> The <dfn id="beziercurveto" title= "dom-context-2d-bezierCurveTo"><code>bezierCurveTo( <var title= "">cp1x</var> , <var title="">cp1y</var> , <var title="">cp2x</var> , <var title="">cp2y</var> , <var title="">x</var> , <var title= "">y</var> )</code></dfn> method must do nothing if the context has no subpaths. Otherwise, it must connect the last point in the subpath to the given point ( <var title="">x</var> , <var title= "">y</var> ) using a cubic Bézier curve with control points ( <var title="">cp1x</var> , <var title="">cp1y</var> ) and ( <var title="">cp2x</var> , <var title="">cp2y</var> ). Then, it must add the point ( <var title="">x</var> , <var title="">y</var> ) to the subpath. <a href="#references">[BEZIER]</a> The <dfn id="arcto" title="dom-context-2d-arcTo"><code>arcTo( <var title="">x1</var> , <var title="">y1</var> , <var title= "">x2</var> , <var title="">y2</var> , <var title="">radius</var> )</code></dfn> method must do nothing if the context has no subpaths. If the context does have a subpath, then the <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> depends on the arguments and the last point in the subpath. <ins class="diff-new">Negative values for</ins> <var title= ""><ins class="diff-new">radius</ins></var> <ins class= "diff-new">must cause the implementation to raise an</ins> <code><ins class="diff-new">INDEX_SIZE_ERR</ins></code> <ins class= "diff-new">exception.</ins> Let the point ( <var title="">x0</var> , <var title="">y0</var> ) be the last point in the subpath. <del class= "diff-old">Let</del> <ins class="diff-chg">If the point (</ins> <var title= ""><del class="diff-old">The Arc</del> <ins class= "diff-chg">x0</ins></var> ,<var title=""><ins class= "diff-chg">y0</ins></var> <del class="diff-old">be</del> <ins class="diff-chg">) is equal to</ins> the <del class= "diff-old">shortest arc given by circumference of</del> <ins class= "diff-chg">point (</ins> <var title=""><ins class= "diff-chg">x1</ins></var> ,<var title=""><ins class= "diff-chg">y1</ins></var> <ins class="diff-chg">), or if</ins> the <del class="diff-old">circle</del> <ins class="diff-chg">point (</ins> <var title=""><ins class="diff-chg">x1</ins></var> ,<var title=""><ins class="diff-chg">y1</ins></var> <ins class= "diff-chg">) is equal to the point (</ins> <var title= ""><ins class="diff-chg">x2</ins></var> ,<var title=""><ins class= "diff-chg">y2</ins></var> <ins class="diff-chg">), then the method must add the point (</ins> <var title=""><ins class= "diff-chg">x1</ins></var> ,<var title=""><ins class= "diff-chg">y1</ins></var> <ins class="diff-chg">) to the subpath, and connect</ins> that <del class="diff-old">has one</del> point <del class="diff-old">tangent</del> to the <del class= "diff-old">line defined</del> <ins class="diff-chg">previous point (</ins> <var title=""><ins class="diff-chg">x0</ins></var> ,<var title=""><ins class="diff-chg">y0</ins></var> <ins class= "diff-chg">)</ins> by <ins class="diff-new">a straight line.</ins> <ins class="diff-new">Otherwise, if</ins> the points ( <var title="">x0</var> , <var title="">y0</var> <del class= "diff-old">)</del> <ins class="diff-chg">), (</ins> <var title= ""><ins class="diff-chg">x1</ins></var> ,<var title=""><ins class= "diff-chg">y1</ins></var> <ins class="diff-chg">),</ins> and ( <var title=""><ins class="diff-new">x2</ins></var> ,<var title= ""><ins class="diff-new">y2</ins></var> <ins class="diff-new">) all lie on a single straight line, then: if the direction from (</ins> <var title=""><ins class="diff-new">x0</ins></var> ,<var title= ""><ins class="diff-new">y0</ins></var> <ins class="diff-new">) to (</ins> <var title="">x1</var> , <var title="">y1</var> <ins class= "diff-new">) is the same as the direction from (</ins> <var title= ""><ins class="diff-new">x1</ins></var> ,<var title=""><ins class= "diff-new">y1</ins></var> <ins class="diff-new">) to (</ins> <var title=""><ins class="diff-new">x2</ins></var> ,<var title= ""><ins class="diff-new">y2</ins></var> ), <del class= "diff-old">another</del> <ins class="diff-chg">then method must add the</ins> point <del class="diff-old">tangent</del> <ins class= "diff-chg">(</ins> <var title=""><ins class= "diff-chg">x1</ins></var> ,<var title=""><ins class= "diff-chg">y1</ins></var> <ins class="diff-chg">)</ins> to the <del class="diff-old">line defined</del> <ins class= "diff-chg">subpath, and connect that point to the previous point (</ins> <var title=""><ins class="diff-chg">x0</ins></var> ,<var title=""><ins class="diff-chg">y0</ins></var> <ins class= "diff-chg">)</ins> by <ins class="diff-new">a straight line; otherwise,</ins> the <del class="diff-old">points</del> <ins class= "diff-chg">direction from (</ins> <var title=""><ins class= "diff-chg">x0</ins></var> ,<var title=""><ins class= "diff-chg">y0</ins></var> <ins class="diff-chg">) to</ins> ( <var title="">x1</var> , <var title="">y1</var> ) <del class= "diff-old">and</del> <ins class="diff-chg">is the opposite of the direction from (</ins> <var title=""><ins class= "diff-chg">x1</ins></var> ,<var title=""><ins class= "diff-chg">y1</ins></var> <ins class="diff-chg">) to</ins> ( <var title="">x2</var> , <var title="">y2</var> ), and <del class= "diff-old">that has radius</del> <ins class="diff-chg">the method must add a point (</ins> <var title=""><del class="diff-old">radius . The points at which this circle touches these two lines are called</del> <ins class="diff-chg">x</ins> <ins class= "diff-chg">∞</ins></var> ,<var title=""><ins class= "diff-chg">y</ins> <ins class="diff-chg">∞</ins></var> <ins class="diff-chg">) to</ins> the <del class= "diff-old">start</del> <ins class="diff-chg">subpath,</ins> and <del class="diff-old">end tangent points respectively. If</del> <ins class="diff-chg">connect that point to</ins> the <ins class= "diff-new">previous</ins> point ( <var title=""><ins class= "diff-new">x0</ins></var> ,<var title=""><ins class= "diff-new">y0</ins></var> <ins class="diff-new">) by a straight line, where (</ins> <var title=""><ins class="diff-new">x</ins> <ins class="diff-new">∞</ins></var> ,<var title= ""><ins class="diff-new">y</ins> <ins class= "diff-new">∞</ins></var> <ins class="diff-new">) is the point that is infinitely far away from (</ins> <var title=""><ins class= "diff-new">x1</ins></var> ,<var title=""><ins class= "diff-new">y1</ins></var> <ins class="diff-new">), that lies on the same line as (</ins> <var title=""><ins class= "diff-new">x0</ins></var> ,<var title=""><ins class= "diff-new">y0</ins></var> <ins class="diff-new">), (</ins> <var title=""><ins class="diff-new">x1</ins></var> ,<var title= ""><ins class="diff-new">y1</ins></var> <ins class="diff-new">), and (</ins> <var title="">x2</var> , <var title="">y2</var> <del class="diff-old">)</del> <ins class="diff-chg">), and that</ins> is on the <ins class="diff-new">same side of (</ins> <var title=""><ins class="diff-new">x1</ins></var> ,<var title= ""><ins class="diff-new">y1</ins></var> <ins class="diff-new">) on that</ins> line <del class="diff-old">defined</del> <ins class= "diff-chg">as (</ins> <var title=""><ins class= "diff-chg">x2</ins></var> ,<var title=""><ins class= "diff-chg">y2</ins></var> <ins class="diff-chg">).</ins> <ins class="diff-chg">Otherwise, let</ins> <var title= ""><ins class="diff-chg">The Arc</ins></var> <ins class= "diff-chg">be the shortest arc given</ins> by <ins class= "diff-new">circumference of</ins> the <del class= "diff-old">points</del> <ins class="diff-chg">circle that has radius</ins> <var title=""><ins class="diff-chg">radius</ins></var> ,<ins class="diff-chg">and that has one point tangent to the half-infinite line that crosses the point</ins> ( <var title= "">x0</var> , <var title="">y0</var> ) and <ins class= "diff-new">ends at the point (</ins> <var title=""><ins class= "diff-new">x1</ins></var> ,<var title=""><ins class= "diff-new">y1</ins></var> <ins class="diff-new">), and that has a different point tangent to the half-infinite line that ends at the point</ins> ( <var title="">x1</var> , <var title="">y1</var> ) <del class="diff-old">then</del> <ins class="diff-chg">and crosses</ins> the <del class="diff-old">method must do nothing, as no arc would satisfy</del> <ins class="diff-chg">point (</ins> <var title=""><ins class="diff-chg">x2</ins></var> ,<var title= ""><ins class="diff-chg">y2</ins></var> <ins class="diff-chg">). The points at which this circle touches these two lines are called</ins> the <del class="diff-old">above constraints.</del> <ins class="diff-chg">start and end tangent points respectively.</ins> <del class="diff-old">Otherwise, the</del> <ins class= "diff-chg">The</ins> method must connect the point ( <var title= "">x0</var> , <var title="">y0</var> ) to the start tangent point by a straight line, <ins class="diff-new">adding the start tangent point to the subpath, and</ins> then <ins class= "diff-new">must</ins> connect the start tangent point to the end tangent point by <var title="">The Arc</var> , <del class= "diff-old">and finally add</del> <ins class="diff-chg">adding</ins> the <del class="diff-old">start and</del> end tangent <del class= "diff-old">points</del> <ins class="diff-chg">point</ins> to the subpath. <del class="diff-old">Negative or zero values for radius must cause the implementation to raise an INDEX_SIZE_ERR exception.</del> The <dfn id="arcx-" title= "dom-context-2d-arc"><code>arc( <var title="">x</var> , <var title= "">y</var> , <var title="">radius</var> , <var title= "">startAngle</var> , <var title="">endAngle</var> , <var title= "">anticlockwise</var> )</code></dfn> method draws an arc. If the context has any subpaths, then the method must add a straight line from the last point in the subpath to the start point of the arc. In any case, it must draw the arc between the start point of the arc and the end point of the arc, and add the start and end points of the arc to the subpath. The arc and its start and end points are defined as follows: Consider a circle that has its origin at ( <var title="">x</var> , <var title="">y</var> ) and that has radius <var title= "">radius</var> . The points at <var title="">startAngle</var> and <var title="">endAngle</var> along the circle's circumference, measured in radians clockwise from the positive x-axis, are the start and end points respectively. The arc is the path along the circumference of this circle from the start point to the end point, going anti-clockwise if the <var title="">anticlockwise</var> argument is true, and clockwise otherwise. <del class= "diff-old">Negative</del> <ins class="diff-chg">Since the points are on the circle, as opposed to being simply angles from zero, the arc can never cover an angle greater than 2π radians. If the two angles are equal,</ins> or <ins class="diff-new">if the radius is zero, then the arc is defined as being of</ins> zero <ins class= "diff-new">length in both directions.</ins> <ins class="diff-new">Negative</ins> values for <var title= "">radius</var> must cause the implementation to raise an <code>INDEX_SIZE_ERR</code> exception. The <dfn id="rectx" title="dom-context-2d-rect"><code>rect( <var title="">x</var> , <var title="">y</var> , <var title= "">w</var> , <var title="">h</var> )</code></dfn> method must create a new subpath containing just the four points ( <var title= "">x</var> , <var title="">y</var> ), ( <var title="">x</var> + <var title="">w</var> , <var title="">y</var> ), ( <var title= "">x</var> + <var title="">w</var> , <var title="">y</var> + <var title="">h</var> ), ( <var title="">x</var> , <var title= "">y</var> + <var title="">h</var> ), with those four points connected by straight lines, and must then mark the subpath as closed. It must then create a new subpath with the point ( <var title="">x</var> , <var title="">y</var> ) as the only point in the subpath. <del class="diff-old">Negative values for w and h must cause the implementation to raise an INDEX_SIZE_ERR exception.</del> The <dfn id="fill" title= "dom-context-2d-fill"><code>fill()</code></dfn> method must fill <del class="diff-old">each subpath</del> <ins class="diff-chg">all the subpaths</ins> of the current <del class="diff-old">path in turn,</del> <ins class="diff-chg">path,</ins> using <code title= "dom-context-2d-fillStyle"><a href= "#fillstyle">fillStyle</a></code> , and using the non-zero winding number rule. Open subpaths must be implicitly closed when being filled (without affecting the actual subpaths). <ins class="diff-new">Thus, if two overlapping but otherwise independent subpaths have opposite windings, they cancel out and result in no fill. If they have the same winding, that area just gets painted once.</ins> The <dfn id="stroke" title= "dom-context-2d-stroke"><code>stroke()</code></dfn> method must <del class="diff-old">stroke each subpath</del> <ins class= "diff-chg">calculate the strokes of all the subpaths</ins> of the current <del class="diff-old">path in turn,</del> <ins class= "diff-chg">path,</ins> using the <code title= "dom-context-2d-lineWidth"><del class="diff-old">strokeStyle</del> <a href="#linewidth"><ins class= "diff-chg">lineWidth</ins></a></code> , <code title= "dom-context-2d-lineCap"><del class="diff-old">lineWidth</del> <a href="#linecap"><ins class="diff-chg">lineCap</ins></a></code> , <code title="dom-context-2d-lineJoin"><a href= "#linejoin">lineJoin</a></code> , and (if appropriate) <code title= "dom-context-2d-miterLimit"><a href= "#miterlimit">miterLimit</a></code> <del class= "diff-old">attributes.</del> <ins class="diff-chg">attributes, and then fill the combined stroke area using the</ins> <code title= "dom-context-2d-strokeStyle"><a href="#strokestyle"><ins class= "diff-chg">strokeStyle</ins></a></code> ,<ins class= "diff-chg">attribute.</ins> <ins class="diff-chg">Since the subpaths are all stroked as one, overlapping parts of the paths in one stroke operation are treated as if their union was what was painted.</ins> Paths, when filled or stroked, must be painted without affecting the current path, and must be subject to <del class= "diff-old">transformations ,</del> <a href="#shadows0" title= "shadows">shadow effects</a> , <a href="#globalalpha" title= "dom-context-2d-globalAlpha">global alpha</a> , <ins class= "diff-chg">the</ins> <a href="#clipping" title= "clipping region">clipping <del class="diff-old">paths</del> <ins class="diff-chg">region</ins></a> , and <a href= "#globalcompositeoperation" title= "dom-context-2d-globalCompositeOperation">global composition operators</a> . <del class="diff-old">The transformation is applied to</del> <ins class="diff-chg">(Transformations affect</ins> the path when <del class="diff-old">it</del> <ins class="diff-chg">the path</ins> is <del class="diff-old">drawn,</del> <ins class= "diff-chg">created,</ins> not when <ins class="diff-new">it is painted, though</ins> the <del class="diff-old">path</del> <ins class="diff-chg">stroke</ins> <a href= "#style1"><ins class="diff-chg">style</ins></a> is <del class= "diff-old">constructed. Thus, a single path can be constructed and then drawn according to different transformations without recreating</del> <ins class="diff-chg">still affected by</ins> the <ins class="diff-new">transformation during painting.)</ins> <ins class="diff-new">Zero-length line segments must be pruned before stroking a</ins> path. <ins class="diff-new">Empty subpaths must be ignored.</ins> The <dfn id="clip" title= "dom-context-2d-clip"><code>clip()</code></dfn> method must create a new <dfn id="clipping">clipping <del class="diff-old">path</del> <ins class="diff-chg">region</ins></dfn> by calculating the intersection of the current clipping <del class= "diff-old">path</del> <ins class="diff-chg">region</ins> and the area described by the current path, using the non-zero winding number rule. Open subpaths must be implicitly closed when computing the clipping <del class="diff-old">path,</del> <ins class= "diff-chg">region,</ins> without affecting the actual subpaths. <ins class="diff-new">The new clipping region replaces the current clipping region.</ins> When the context is <del class="diff-old">created,</del> <ins class="diff-chg">initialized,</ins> the <del class= "diff-old">initial</del> clipping <del class="diff-old">path is</del> <ins class="diff-chg">region must be set to</ins> the rectangle with the top left corner at (0,0) and the width and height of the coordinate space. The <dfn id="ispointinpath" title= "dom-context-2d-isPointInPath"><code>isPointInPath( <var title= "">x</var> , <var title="">y</var> )</code></dfn> method must return true if the point given by the <var title="">x</var> and <var title="">y</var> coordinates passed to the method, when treated as coordinates in the <del class="diff-old">canvas'</del> <ins class="diff-chg">canvas</ins> coordinate space unaffected by the current transformation, is <del class="diff-old">within</del> <ins class="diff-chg">inside</ins> the <del class= "diff-old">area</del> <ins class="diff-chg">current path; and must return false otherwise. Points on the path itself are considered to be inside the path. If either</ins> of the <ins class= "diff-new">arguments is infinite or NaN, then the method must return false.</ins> <h6 id="text"><ins class= "diff-new">3.12.11.1.9.</ins> <ins class= "diff-new">Text</ins></h6> <ins class="diff-new">The</ins> <dfn id="font" title= "dom-context-2d-font"><code><ins class= "diff-new">font</ins></code></dfn> <ins class="diff-new">DOM attribute, on setting, must be parsed the same way as the 'font' property of CSS (but without supporting property-independent stylesheet syntax like 'inherit'), and the resulting font must be assigned to the context, with the 'line-height' component forced to 'normal'.</ins> <a href="#references"><ins class= "diff-new">[CSS]</ins></a> <ins class="diff-new">Font names must be interpreted in the context of the</ins> <code><a href="#canvas">canvas <del class= "diff-old">that</del></a></code> <ins class="diff-chg">element's stylesheets; any fonts embedded using</ins> <code title= ""><ins class="diff-chg">@font-face</ins></code> <ins class= "diff-chg">must therefore be available.</ins> <a href= "#references"><ins class="diff-chg">[CSSWEBFONTS]</ins></a> <ins class="diff-chg">Only vector fonts should be used by the user agent; if a user agent were to use bitmap fonts then transformations</ins> would <ins class="diff-new">likely make the font look very ugly.</ins> <ins class="diff-new">On getting, the</ins> <code title= "dom-context-2d-font"><a href="#font"><ins class= "diff-new">font</ins></a></code> <ins class="diff-new">attribute must return the serialized form of the current font of the context.</ins> <a href="#references"><ins class= "diff-new">[CSSOM]</ins></a> <ins class="diff-new">When the context is created, the font of the context must</ins> be <del class="diff-old">filled</del> <ins class="diff-chg">set to 10px sans-serif. When the 'font-size' component is set to lengths using percentages, 'em' or 'ex' units, or the 'larger' or 'smaller' keywords, these must be interpreted relative to the computed value of the 'font-size' property of the corresponding</ins> <code><a href="#canvas"><ins class= "diff-chg">canvas</ins></a></code> <ins class="diff-chg">element. When the 'font-weight' component is set to the relative values 'bolder' and 'lighter', these must be interpreted relative to the computed value of the 'font-weight' property of the corresponding</ins> <code><a href="#canvas"><ins class= "diff-chg">canvas</ins></a></code> <ins class= "diff-chg">element.</ins> <ins class="diff-chg">The</ins> <dfn id="textalign" title= "dom-context-2d-textAlign"><code><ins class= "diff-chg">textAlign</ins></code></dfn> <ins class="diff-chg">DOM attribute, on getting, must return the current value. On setting,</ins> if the <ins class="diff-new">value is one of</ins> <code title=""><ins class="diff-new">start</ins></code> ,<code title=""><ins class="diff-new">end</ins></code> ,<code title=""><ins class="diff-new">left</ins></code> ,<code title=""><ins class="diff-new">right</ins></code> ,<ins class="diff-new">or</ins> <code title=""><ins class= "diff-new">center</ins></code> ,<ins class="diff-new">then the value must be changed to the new value. Otherwise, the new value must be ignored. When the context is created, the</ins> <code title="dom-context-2d-textAlign"><a href= "#textalign"><ins class="diff-new">textAlign</ins></a></code> <ins class="diff-new">attribute must initially have the value</ins> <code title=""><ins class="diff-new">start</ins></code> . <ins class="diff-new">The</ins> <dfn id="textbaseline" title= "dom-context-2d-textBaseline"><code><ins class= "diff-new">textBaseline</ins></code></dfn> <ins class= "diff-new">DOM attribute, on getting, must return the</ins> current <del class="diff-old">path</del> <ins class="diff-chg">value. On setting, if the value is one of</ins> <code title= "dom-context-2d-textBaseline-top"><a href="#top"><ins class= "diff-chg">top</ins></a></code> ,<code title= "dom-context-2d-textBaseline-hanging"><a href= "#hanging"><ins class="diff-chg">hanging</ins></a></code> ,<code title="dom-context-2d-textBaseline-middle"><a href= "#middle"><ins class="diff-chg">middle</ins></a></code> ,<code title="dom-context-2d-textBaseline-alphabetic"><a href= "#alphabetic"><ins class="diff-chg">alphabetic</ins></a></code> ,<code title="dom-context-2d-textBaseline-ideographic"><a href= "#ideographic"><ins class="diff-chg">ideographic</ins></a></code> ,<ins class="diff-chg">or</ins> <code title= "dom-context-2d-textBaseline-bottom"><a href="#bottom"><ins class= "diff-chg">bottom</ins></a></code> ,<ins class="diff-chg">then the value must be changed to the new value. Otherwise, the new value must be ignored. When the context is created, the</ins> <code title="dom-context-2d-textBaseline"><a href= "#textbaseline"><ins class="diff-chg">textBaseline</ins></a></code> <ins class="diff-chg">attribute must initially have the value</ins> <code title=""><ins class="diff-chg">alphabetic</ins></code> . <ins class="diff-chg">The</ins> <code title= "dom-context-2d-textBaseline"><a href="#textbaseline"><ins class= "diff-chg">textBaseline</ins></a></code> <ins class= "diff-chg">attribute's allowed keywords correspond to alignment points in the font:</ins> <img alt= "The top of the em square is roughly at the top of the glyphs in a font, the hanging baseline is where some glyphs like आ are anchored, the middle is half-way between the top of the em square and the bottom of the em square, the alphabetic baseline is where characters like Á, ÿ, f, and Ω are anchored, the ideographic baseline is where glyphs like 私 and 達 are anchored, and the bottom of the em square is roughly at the bottom of the glyphs in a font. The top and bottom of the bounding box can be far from these baselines, due to glyphs extending far outside the em square." src="images/baselines.png"> <ins class="diff-chg">The keywords map to these alignment points as follows:</ins> <dl> <dt><dfn id="top" title= "dom-context-2d-textBaseline-top"><code><ins class= "diff-chg">top</ins></code></dfn></dt> <dd><ins class="diff-chg">The top of the em square</ins></dd> <dt><dfn id="hanging" title= "dom-context-2d-textBaseline-hanging"><code><ins class= "diff-chg">hanging</ins></code></dfn></dt> <dd><ins class="diff-chg">The hanging baseline</ins></dd> <dt><dfn id="middle" title= "dom-context-2d-textBaseline-middle"><code><ins class= "diff-chg">middle</ins></code></dfn></dt> <dd><ins class="diff-chg">The middle of the em square</ins></dd> <dt><dfn id="alphabetic" title= "dom-context-2d-textBaseline-alphabetic"><code><ins class= "diff-chg">alphabetic</ins></code></dfn></dt> <dd><ins class="diff-chg">The alphabetic baseline</ins></dd> <dt><dfn id="ideographic" title= "dom-context-2d-textBaseline-ideographic"><code><ins class= "diff-chg">ideographic</ins></code></dfn></dt> <dd><ins class="diff-chg">The ideographic baseline</ins></dd> <dt><dfn id="bottom" title= "dom-context-2d-textBaseline-bottom"><code><ins class= "diff-chg">bottom</ins></code></dfn></dt> <dd><ins class="diff-chg">The bottom of the em square</ins></dd> </dl> <ins class="diff-chg">The</ins> <dfn id="filltext" title= "dom-context-2d-fillText"><code><ins class= "diff-chg">fillText()</ins></code></dfn> <ins class= "diff-chg">and</ins> <dfn id="stroketext" title= "dom-context-2d-strokeText"><code><ins class= "diff-chg">strokeText()</ins></code></dfn> <ins class= "diff-chg">methods take three or four arguments,</ins> <var title= ""><ins class="diff-chg">text</ins></var> ,<var title= ""><ins class="diff-chg">x</ins></var> ,<var title=""><ins class= "diff-chg">y</ins></var> ,<ins class="diff-chg">and optionally</ins> <var title=""><ins class= "diff-chg">maxWidth</ins></var> ,<ins class="diff-chg">and render the given</ins> <var title=""><ins class= "diff-chg">text</ins></var> <ins class="diff-chg">at the given (</ins> <var title=""><ins class="diff-chg">x</ins></var> ,<var title=""><ins class="diff-chg">y</ins></var> <ins class= "diff-chg">) coordinates ensuring that the text isn't wider than</ins> <var title=""><ins class="diff-chg">maxWidth</ins></var> <ins class="diff-chg">if specified, using the current</ins> <code title="dom-context-2d-font"><a href="#font"><ins class= "diff-chg">font</ins></a></code> ,<code title= "dom-context-2d-textAlign"><a href="#textalign"><ins class= "diff-chg">textAlign</ins></a></code> ,<ins class= "diff-chg">and</ins> <code title= "dom-context-2d-textBaseline"><a href="#textbaseline"><ins class= "diff-chg">textBaseline</ins></a></code> <ins class= "diff-chg">values. Specifically, when the methods are called, the user agent must run the following steps:</ins> <ol> <li> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">font</ins></var> <ins class="diff-chg">be the current font of the browsing context, as given by the</ins> <code title= "dom-context-2d-font"><a href="#font"><ins class= "diff-chg">font</ins></a></code> <ins class= "diff-chg">attribute.</ins> </li> <li> <ins class="diff-chg">Replace all the</ins> <a href="#space" title="space character"><ins class="diff-chg">space characters</ins></a> <ins class="diff-chg">in</ins> <var title= ""><ins class="diff-chg">text</ins></var> <ins class= "diff-chg">with U+0020 SPACE characters.</ins> </li> <li> <ins class="diff-chg">Form a hypothetical infinitely wide CSS line box containing a single inline box containing the text</ins> <var title=""><ins class="diff-chg">text</ins></var> ,<ins class= "diff-chg">with all the properties at their initial values except the 'font' property of the inline element set to</ins> <var title= ""><ins class="diff-chg">font</ins></var> <ins class="diff-chg">and the 'direction' property of the inline element set to the 'direction' property of the</ins> <code><a href= "#canvas"><ins class="diff-chg">canvas</ins></a></code> <ins class= "diff-chg">element.</ins> <a href="#references"><ins class= "diff-chg">[CSS]</ins></a> </li> <li> <ins class="diff-chg">If the</ins> <var title=""><ins class= "diff-chg">maxWidth</ins></var> <ins class= "diff-chg">argument</ins> was <ins class="diff-new">specified and the hypothetical width of the inline box in the hypothetical line box is greater than</ins> <var title=""><ins class= "diff-new">maxWidth</ins></var> <ins class="diff-new">CSS pixels, then change</ins> <var title=""><ins class= "diff-new">font</ins></var> to <ins class="diff-new">have a more condensed font (if one is available or if a reasonably readable one can</ins> be <del class="diff-old">filled;</del> <ins class= "diff-chg">synthesized by applying a horizontal scale factor to the font) or a smaller font, and return to the previous step.</ins> </li> <li> <ins class="diff-chg">Let the</ins> <var title=""><ins class= "diff-chg">anchor point</ins></var> <ins class="diff-chg">be a point on the inline box, determined by the</ins> <code title= "dom-context-2d-textAlign"><a href="#textalign"><ins class= "diff-chg">textAlign</ins></a></code> <ins class= "diff-chg">and</ins> <code title= "dom-context-2d-textBaseline"><a href="#textbaseline"><ins class= "diff-chg">textBaseline</ins></a></code> <ins class= "diff-chg">values, as follows:</ins> <ins class="diff-chg">Horizontal position:</ins> <dl> <dt><ins class="diff-chg">If</ins> <code title= "dom-context-2d-textAlign"><a href="#textalign"><ins class= "diff-chg">textAlign</ins></a></code> <ins class= "diff-chg">is</ins> <code title=""><ins class= "diff-chg">left</ins></code></dt> <dt><ins class="diff-chg">If</ins> <code title= "dom-context-2d-textAlign"><a href="#textalign"><ins class= "diff-chg">textAlign</ins></a></code> <ins class= "diff-chg">is</ins> <code title=""><ins class= "diff-chg">start</ins></code> <ins class="diff-chg">and the 'direction' property on the</ins> <code><a href= "#canvas"><ins class="diff-chg">canvas</ins></a></code> <ins class= "diff-chg">element has a computed value of 'ltr'</ins></dt> <dt><ins class="diff-chg">If</ins> <code title= "dom-context-2d-textAlign"><a href="#textalign"><ins class= "diff-chg">textAlign</ins></a></code> <ins class= "diff-chg">is</ins> <code title=""><ins class= "diff-chg">end</ins></code> <ins class="diff-chg">and the 'direction' property on the</ins> <code><a href= "#canvas"><ins class="diff-chg">canvas</ins></a></code> <ins class= "diff-chg">element has a computed value of 'rtl'</ins></dt> <dd><ins class="diff-chg">Let the</ins> <var title=""><ins class= "diff-chg">anchor point</ins></var> <ins class="diff-chg">'s horizontal position be the left edge of the inline box.</ins></dd> <dt><ins class="diff-chg">If</ins> <code title= "dom-context-2d-textAlign"><a href="#textalign"><ins class= "diff-chg">textAlign</ins></a></code> <ins class= "diff-chg">is</ins> <code title=""><ins class= "diff-chg">right</ins></code></dt> <dt><ins class="diff-chg">If</ins> <code title= "dom-context-2d-textAlign"><a href="#textalign"><ins class= "diff-chg">textAlign</ins></a></code> <ins class= "diff-chg">is</ins> <code title=""><ins class= "diff-chg">end</ins></code> <ins class="diff-chg">and the 'direction' property on the</ins> <code><a href= "#canvas"><ins class="diff-chg">canvas</ins></a></code> <ins class= "diff-chg">element has a computed value of 'ltr'</ins></dt> <dt><ins class="diff-chg">If</ins> <code title= "dom-context-2d-textAlign"><a href="#textalign"><ins class= "diff-chg">textAlign</ins></a></code> <ins class= "diff-chg">is</ins> <code title=""><ins class= "diff-chg">start</ins></code> <ins class="diff-chg">and the 'direction' property on the</ins> <code><a href= "#canvas"><ins class="diff-chg">canvas</ins></a></code> <ins class= "diff-chg">element has a computed value of 'rtl'</ins></dt> <dd><ins class="diff-chg">Let the</ins> <var title=""><ins class= "diff-chg">anchor point</ins></var> <ins class="diff-chg">'s horizontal position be the right edge of the inline box.</ins></dd> <dt><ins class="diff-chg">If</ins> <code title= "dom-context-2d-textAlign"><a href="#textalign"><ins class= "diff-chg">textAlign</ins></a></code> <ins class= "diff-chg">is</ins> <code title=""><ins class= "diff-chg">center</ins></code></dt> <dd><ins class="diff-chg">Let the</ins> <var title=""><ins class= "diff-chg">anchor point</ins></var> <ins class="diff-chg">'s horizontal position be half way between the left and right edges of the inline box.</ins></dd> </dl> <ins class="diff-chg">Vertical position:</ins> <dl> <dt><ins class="diff-chg">If</ins> <code title= "dom-context-2d-textBaseline"><a href="#textbaseline"><ins class= "diff-chg">textBaseline</ins></a></code> <ins class= "diff-chg">is</ins> <code title= "dom-context-2d-textBaseline-top"><a href="#top"><ins class= "diff-chg">top</ins></a></code></dt> <dd><ins class="diff-chg">Let the</ins> <var title=""><ins class= "diff-chg">anchor point</ins></var> <ins class="diff-chg">'s vertical position be the top of the em box of the first available font of the inline box.</ins></dd> <dt><ins class="diff-chg">If</ins> <code title= "dom-context-2d-textBaseline"><a href="#textbaseline"><ins class= "diff-chg">textBaseline</ins></a></code> <ins class= "diff-chg">is</ins> <code title= "dom-context-2d-textBaseline-hanging"><a href= "#hanging"><ins class="diff-chg">hanging</ins></a></code></dt> <dd><ins class="diff-chg">Let the</ins> <var title=""><ins class= "diff-chg">anchor point</ins></var> <ins class="diff-chg">'s vertical position be the hanging baseline of the first available font of the inline box.</ins></dd> <dt><ins class="diff-chg">If</ins> <code title= "dom-context-2d-textBaseline"><a href="#textbaseline"><ins class= "diff-chg">textBaseline</ins></a></code> <ins class= "diff-chg">is</ins> <code title= "dom-context-2d-textBaseline-middle"><a href="#middle"><ins class= "diff-chg">middle</ins></a></code></dt> <dd><ins class="diff-chg">Let the</ins> <var title=""><ins class= "diff-chg">anchor point</ins></var> <ins class="diff-chg">'s vertical position be half way between the bottom and the top of the em box of the first available font of the inline box.</ins></dd> <dt><ins class="diff-chg">If</ins> <code title= "dom-context-2d-textBaseline"><a href="#textbaseline"><ins class= "diff-chg">textBaseline</ins></a></code> <ins class= "diff-chg">is</ins> <code title= "dom-context-2d-textBaseline-alphabetic"><a href= "#alphabetic"><ins class= "diff-chg">alphabetic</ins></a></code></dt> <dd><ins class="diff-chg">Let the</ins> <var title=""><ins class= "diff-chg">anchor point</ins></var> <ins class="diff-chg">'s vertical position be the alphabetic baseline of the first available font of the inline box.</ins></dd> <dt><ins class="diff-chg">If</ins> <code title= "dom-context-2d-textBaseline"><a href="#textbaseline"><ins class= "diff-chg">textBaseline</ins></a></code> <ins class= "diff-chg">is</ins> <code title= "dom-context-2d-textBaseline-ideographic"><a href= "#ideographic"><ins class= "diff-chg">ideographic</ins></a></code></dt> <dd><ins class="diff-chg">Let the</ins> <var title=""><ins class= "diff-chg">anchor point</ins></var> <ins class="diff-chg">'s vertical position be the ideographic baseline of the first available font of the inline box.</ins></dd> <dt><ins class="diff-chg">If</ins> <code title= "dom-context-2d-textBaseline"><a href="#textbaseline"><ins class= "diff-chg">textBaseline</ins></a></code> <ins class= "diff-chg">is</ins> <code title= "dom-context-2d-textBaseline-bottom"><a href="#bottom"><ins class= "diff-chg">bottom</ins></a></code></dt> <dd><ins class="diff-chg">Let the</ins> <var title=""><ins class= "diff-chg">anchor point</ins></var> <ins class="diff-chg">'s vertical position be the bottom of the em box of the first available font of the inline box.</ins></dd> </dl> </li> <li> <ins class="diff-chg">Paint the hypothetical inline box as the shape given by the text's glyphs, as transformed by the</ins> <a href="#transformations0" title= "dom-context-2d-transformation"><ins class="diff-chg">current transformation matrix</ins></a> ,<ins class="diff-chg">and anchored and sized so that before applying the</ins> <a href= "#transformations0" title= "dom-context-2d-transformation"><ins class="diff-chg">current transformation matrix</ins></a> ,<ins class="diff-chg">the</ins> <var title=""><ins class="diff-chg">anchor point</ins></var> <ins class="diff-chg">is at (</ins> <var title=""><ins class= "diff-chg">x</ins></var> ,<var title=""><ins class= "diff-chg">y</ins></var> <ins class="diff-chg">) and each CSS pixel is mapped to one coordinate space unit.</ins> <ins class="diff-chg">For</ins> <code title= "dom-context-2d-fillText"><a href="#filltext"><ins class= "diff-chg">fillText()</ins></a></code> <code title= "dom-context-2d-fillStyle"><a href="#fillstyle"><ins class= "diff-chg">fillStyle</ins></a></code> <ins class="diff-chg">must be applied to the glyphs and</ins> <code title= "dom-context-2d-strokeStyle"><a href="#strokestyle"><ins class= "diff-chg">strokeStyle</ins></a></code> <ins class="diff-chg">must be ignored. For</ins> <code title= "dom-context-2d-strokeText"><a href="#stroketext"><ins class= "diff-chg">strokeText()</ins></a></code> <ins class="diff-chg">the reverse holds</ins> and <code title= "dom-context-2d-strokeStyle"><a href="#strokestyle"><ins class= "diff-new">strokeStyle</ins></a></code> must <ins class= "diff-new">be applied to the glyph outlines and</ins> <code title= "dom-context-2d-fillStyle"><a href="#fillstyle"><ins class= "diff-new">fillStyle</ins></a></code> <ins class="diff-new">must be ignored.</ins> <ins class="diff-new">Text is painted without affecting the current path, and is subject to</ins> <a href="#shadows0" title= "shadows"><ins class="diff-new">shadow effects</ins></a> ,<a href= "#globalalpha" title="dom-context-2d-globalAlpha"><ins class= "diff-new">global alpha</ins></a> ,<ins class="diff-new">the</ins> <a href="#clipping" title="clipping region"><ins class= "diff-new">clipping region</ins></a> ,<ins class= "diff-new">and</ins> <a href="#globalcompositeoperation" title= "dom-context-2d-globalCompositeOperation"><ins class= "diff-new">global composition operators</ins></a> . </li> </ol> <ins class="diff-new">The</ins> <dfn id="measuretext" title= "dom-context-2d-measureText"><code><ins class= "diff-new">measureText()</ins></code></dfn> <ins class= "diff-new">method takes one argument,</ins> <var title= ""><ins class="diff-new">text</ins></var> .<ins class= "diff-new">When the method is invoked, the user agent must replace all the</ins> <a href="#space" title="space character"><ins class= "diff-new">space characters</ins></a> <ins class= "diff-new">in</ins> <var title=""><ins class= "diff-new">text</ins></var> <ins class="diff-new">with U+0020 SPACE characters, and then must form a hypothetical infinitely wide CSS line box containing a single inline box containing the text</ins> <var title=""><ins class="diff-new">text</ins></var> ,<ins class= "diff-new">with all the properties at their initial values except the 'font' property of the inline element set to the current font of the browsing context, as given by the</ins> <code title= "dom-context-2d-font"><a href="#font"><ins class= "diff-new">font</ins></a></code> <ins class="diff-new">attribute, and must then</ins> return <del class="diff-old">false otherwise.</del> <ins class="diff-chg">a new</ins> <code><a href= "#textmetrics"><ins class="diff-chg">TextMetrics</ins></a></code> <ins class="diff-chg">object with its</ins> <code title= "dom-textmetrics-width"><a href="#width2"><ins class= "diff-chg">width</ins></a></code> <ins class="diff-chg">attribute set to the width of that inline box, in CSS pixels.</ins> <a href= "#references"><ins class="diff-chg">[CSS]</ins></a> <ins class="diff-chg">The</ins> <code><a href= "#textmetrics"><ins class="diff-chg">TextMetrics</ins></a></code> <ins class="diff-chg">interface is used for the objects returned from</ins> <code title="dom-context-2d-measureText"><a href= "#measuretext"><ins class="diff-chg">measureText()</ins></a></code> .<ins class="diff-chg">It has one attribute,</ins> <dfn id="width2" title="dom-textmetrics-width"><code><ins class= "diff-chg">width</ins></code></dfn> ,<ins class="diff-chg">which is set by the</ins> <code title="dom-context-2d-measureText"><a href= "#measuretext"><ins class="diff-chg">measureText()</ins></a></code> <ins class="diff-chg">method.</ins> <ins class="diff-chg">Glyphs rendered using</ins> <code title="dom-context-2d-fillText"><a href= "#filltext"><ins class="diff-chg">fillText()</ins></a></code> <ins class="diff-chg">and</ins> <code title= "dom-context-2d-strokeText"><a href="#stroketext"><ins class= "diff-chg">strokeText()</ins></a></code> <ins class="diff-chg">can spill out of the box given by the font size (the em square size) and the width returned by</ins> <code title= "dom-context-2d-measureText"><a href="#measuretext"><ins class= "diff-chg">measureText()</ins></a></code> <ins class= "diff-chg">(the text width). This version of the specification does not provide a way to obtain the bounding box dimensions of the text. If the text is to be rendered and removed, care needs to be taken to replace the entire area of the canvas that the clipping region covers, not just the box given by the em square height and measured text width.</ins> <ins class="diff-chg">A future version of the 2D context API may provide a way to render fragments of documents, rendered using CSS, straight to the canvas. This would be provided in preference to a dedicated way of doing multiline layout.</ins> <h6 id="images"><del class= "diff-old">3.14.11.1.9.</del> <ins class= "diff-chg">3.12.11.1.10.</ins> Images</h6> To draw images onto the canvas, the <dfn id="drawimage" title= "dom-context-2d-drawImage"><code>drawImage</code></dfn> method can be used. This method is overloaded with three variants: <code title= "">drawImage( <var title="">image</var> , <var title="">dx</var> , <var title="">dy</var> )</code> , <code title="">drawImage( <var title="">image</var> , <var title="">dx</var> , <var title= "">dy</var> , <var title="">dw</var> , <var title="">dh</var> )</code> , and <code title="">drawImage( <var title="">image</var> , <var title="">sx</var> , <var title="">sy</var> , <var title= "">sw</var> , <var title="">sh</var> , <var title="">dx</var> , <var title="">dy</var> , <var title="">dw</var> , <var title= "">dh</var> )</code> . (Actually it is overloaded with six; each of those three can take either an <code><a href= "#htmlimageelement">HTMLImageElement</a></code> or an <code><a href="#htmlcanvaselement">HTMLCanvasElement</a></code> for the <var title="">image</var> argument.) If not specified, the <var title="">dw</var> and <var title="">dh</var> arguments <ins class="diff-new">must</ins> default to the values of <var title="">sw</var> and <var title="">sh</var> , interpreted such that one CSS pixel in the image is treated as one unit in the canvas coordinate space. If the <var title="">sx</var> , <var title="">sy</var> , <var title="">sw</var> , and <var title= "">sh</var> arguments are omitted, they <ins class= "diff-new">must</ins> default to 0, 0, the image's intrinsic width in image pixels, and the image's intrinsic height in image pixels, respectively. The <var title="">image</var> argument must be an instance of an <code><a href="#htmlimageelement">HTMLImageElement</a></code> or <code><a href="#htmlcanvaselement">HTMLCanvasElement</a></code> . If the <var title="">image</var> is of the wrong <del class= "diff-old">type,</del> <ins class="diff-chg">type or null,</ins> the implementation must raise a <code>TYPE_MISMATCH_ERR</code> exception. If <del class="diff-old">one of</del> the <var title= ""><del class="diff-old">sy</del> <ins class= "diff-chg">image</ins></var> <ins class="diff-chg">argument is an</ins> <code><a href="#htmlimageelement"><ins class= "diff-chg">HTMLImageElement</ins></a></code> <ins class= "diff-chg">object whose</ins> <code title= "dom-img-complete"><a href="#complete"><ins class= "diff-chg">complete</ins></a></code> <ins class= "diff-chg">attribute is false, then the implementation must raise an</ins> <code><ins class="diff-chg">INVALID_STATE_ERR</ins></code> <ins class="diff-chg">exception.</ins> <ins class="diff-chg">The source rectangle is the rectangle whose corners are the four points (</ins> <var title=""><ins class= "diff-chg">sx</ins></var> , <var title=""><ins class= "diff-new">sy</ins></var> <ins class="diff-new">), (</ins> <var title=""><ins class="diff-new">sx</ins></var> <ins class="diff-new">+</ins> <var title="">sw <del class= "diff-old">,</del></var> , <var title=""><ins class= "diff-chg">sy</ins></var> <ins class="diff-chg">), (</ins> <var title=""><ins class="diff-chg">sx</ins></var> <ins class="diff-chg">+</ins> <var title="">sw</var> , <var title=""><ins class="diff-new">sy</ins></var> <ins class="diff-new">+</ins> <var title=""><ins class= "diff-new">sh</ins></var> <ins class="diff-new">), (</ins> <var title=""><ins class="diff-new">sx</ins></var> , <del class= "diff-old">and</del> <var title=""><ins class= "diff-chg">sy</ins></var> <ins class="diff-chg">+</ins> <var title= "">sh</var> <del class="diff-old">arguments is outside</del> <ins class="diff-chg">).</ins> <ins class="diff-chg">If</ins> the <del class="diff-old">size of</del> <ins class="diff-chg">source rectangle is not entirely within</ins> the <ins class="diff-new">source</ins> image, or if one of the <var title=""><del class="diff-old">dw</del> <ins class= "diff-chg">sw</ins></var> <del class="diff-old">and</del> <ins class="diff-chg">or</ins> <var title=""><del class= "diff-old">dh</del> <ins class="diff-chg">sh</ins></var> arguments is <del class="diff-old">negative,</del> <ins class= "diff-chg">zero,</ins> the implementation must raise an <code>INDEX_SIZE_ERR</code> exception. <del class= "diff-old">If</del> <ins class="diff-chg">The destination rectangle is</ins> the <ins class="diff-new">rectangle whose corners are the four points (</ins> <var title=""><del class="diff-old">image</del> <ins class= "diff-chg">dx</ins></var> ,<var title=""><ins class= "diff-chg">dy</ins></var> <del class="diff-old">argument is an</del> <ins class="diff-chg">), (</ins> <del class= "diff-old">HTMLImageElement</del> <var title=""><ins class= "diff-chg">dx</ins></var> <ins class="diff-chg">+</ins> <var title= ""><ins class="diff-chg">dw</ins></var> <del class= "diff-old">object whose complete attribute is false, then the implementation must raise an INVALID_STATE_ERR exception.</del> , <var title=""><ins class= "diff-chg">dy</ins></var> <ins class="diff-chg">), (</ins> <var title=""><ins class="diff-chg">dx</ins></var> <ins class="diff-chg">+</ins> <var title=""><ins class= "diff-chg">dw</ins></var> ,<var title=""><ins class= "diff-chg">dy</ins></var> <ins class="diff-chg">+</ins> <var title= ""><ins class="diff-chg">dh</ins></var> <ins class= "diff-chg">), (</ins> <var title=""><ins class= "diff-chg">dx</ins></var> ,<var title=""><ins class= "diff-chg">dy</ins></var> <ins class="diff-chg">+</ins> <var title= ""><ins class="diff-chg">dh</ins></var> <ins class= "diff-chg">).</ins> When <code title="dom-context-2d-drawImage"><a href= "#drawimage">drawImage()</a></code> is invoked, the <del class= "diff-old">specified</del> region of the image specified by the source rectangle <del class="diff-old">( sx , sy , sw , sh )</del> must be painted on the region of the canvas specified by the destination <del class="diff-old">rectangle ( dx , dy , dw , dh ),</del> <ins class="diff-chg">rectangle,</ins> after applying the <a href="#transformations0" title= "dom-context-2d-transformation">current transformation matrix <del class="diff-old">.</del></a> <ins class="diff-chg">to the points of the destination rectangle.</ins> <img alt="" src="images/drawImage.png"> When a canvas is drawn onto itself, the drawing model requires the source to be copied before the image is drawn back onto the canvas, so it is possible to copy parts of a canvas onto overlapping parts of itself. <ins class="diff-new">When the</ins> <code title= "dom-context-2d-drawImage"><a href="#drawimage"><ins class= "diff-new">drawImage()</ins></a></code> <ins class= "diff-new">method is passed, as its</ins> <var title=""><ins class= "diff-new">image</ins></var> <ins class="diff-new">argument, an animated image, the poster frame of the animation, or the first frame of the animation if there is no poster frame, must be used.</ins> Images are painted without affecting the current path, and are subject to <a href="#shadows0" title="shadows">shadow effects</a> , <a href="#globalalpha" title="dom-context-2d-globalAlpha">global alpha</a> , <ins class="diff-chg">the</ins> <a href="#clipping" title="clipping region">clipping <del class="diff-old">paths</del> <ins class="diff-chg">region</ins></a> , and <a href= "#globalcompositeoperation" title= "dom-context-2d-globalCompositeOperation">global composition operators</a> . <h6 id="pixel"><del class= "diff-old">3.14.11.1.10.</del> <ins class= "diff-chg">3.12.11.1.11.</ins> <dfn id="pixel1">Pixel manipulation</dfn></h6> The <dfn id="createimagedata" title= "dom-context-2d-createImageData"><code><ins class= "diff-new">createImageData(</ins> <var title=""><ins class= "diff-new">sw</ins></var> ,<var title=""><ins class= "diff-new">sh</ins></var> <ins class= "diff-new">)</ins></code></dfn> <ins class="diff-new">method must return an</ins> <code><a href="#imagedata"><ins class= "diff-new">ImageData</ins></a></code> <ins class="diff-new">object representing a rectangle with a width in CSS pixels equal to the absolute magnitude of</ins> <var title=""><ins class= "diff-new">sw</ins></var> <ins class="diff-new">and a height in CSS pixels equal to the absolute magnitude of</ins> <var title= ""><ins class="diff-new">sh</ins></var> ,<ins class= "diff-new">filled with transparent black.</ins> <ins class="diff-new">The</ins> <dfn id="getimagedata" title= "dom-context-2d-getImageData"><code>getImageData( <var title= "">sx</var> , <var title="">sy</var> , <var title="">sw</var> , <var title="">sh</var> )</code></dfn> method must return an <code><a href="#imagedata">ImageData</a></code> object representing the underlying pixel data for the area of the canvas denoted by the rectangle <del class="diff-old">which has its top left corner at</del> <ins class="diff-chg">whose corners are</ins> the <ins class="diff-new">four points</ins> ( <var title="">sx</var> , <var title="">sy</var> <del class="diff-old">) coordinate, and that has width</del> <ins class="diff-chg">), (</ins> <var title= ""><ins class="diff-chg">sx</ins></var> <ins class= "diff-chg">+</ins> <var title="">sw</var> <del class="diff-old">and height</del> , <var title=""><ins class= "diff-chg">sy</ins></var> <ins class="diff-chg">), (</ins> <var title=""><ins class="diff-chg">sx</ins></var> <ins class="diff-chg">+</ins> <var title=""><ins class= "diff-chg">sw</ins></var> ,<var title=""><ins class= "diff-chg">sy</ins></var> <ins class="diff-chg">+</ins> <var title= "">sh <del class="diff-old">.</del></var> <ins class= "diff-chg">), (</ins> <var title=""><ins class= "diff-chg">sx</ins></var> ,<var title=""><ins class= "diff-chg">sy</ins></var> <ins class="diff-chg">+</ins> <var title= ""><ins class="diff-chg">sh</ins></var> <ins class= "diff-chg">), in canvas coordinate space units.</ins> Pixels outside the canvas must be returned as transparent black. Pixels must be returned as non-premultiplied alpha values. <ins class="diff-new">If any of the arguments to</ins> <code title="dom-context-2d-createImageData"><a href= "#createimagedata"><ins class= "diff-new">createImageData()</ins></a></code> <ins class= "diff-new">or</ins> <code title= "dom-context-2d-getImageData"><a href="#getimagedata"><ins class= "diff-new">getImageData()</ins></a></code> <ins class= "diff-new">are infinite or NaN, or if either the</ins> <var title= ""><ins class="diff-new">sw</ins></var> <ins class= "diff-new">or</ins> <var title=""><ins class= "diff-new">sh</ins></var> <ins class="diff-new">arguments are zero, the method must instead raise an</ins> <code><ins class= "diff-new">INDEX_SIZE_ERR</ins></code> <ins class= "diff-new">exception.</ins> <code><a href="#imagedata">ImageData</a></code> objects must be <del class="diff-old">initialised</del> <ins class= "diff-chg">initialized</ins> so that their <dfn id="width3" title= "dom-imagedata-width"><code>width</code></dfn> attribute is set to <var title="">w</var> , the number of physical device pixels per row in the image data, their <dfn id="height2" title= "dom-imagedata-height"><code>height</code></dfn> attribute is set to <var title="">h</var> , the number of rows in the image data, and the <dfn id="data1" title= "dom-imagedata-data"><code>data</code></dfn> attribute is <del class="diff-old">initialised</del> <ins class= "diff-chg">initialized</ins> to an array of <var title="">h</var> × <var title="">w</var> ×4 integers. The pixels must be represented in this array in left-to-right order, row by row, starting at the top left, with each pixel's red, green, blue, and alpha components being given in that order. Each component of each device pixel represented in this array must be in the range 0..255, representing the 8 bit value for that component. At least one pixel must be returned. The values of the <code title="dom-imagedata-data"><a href= "#data1">data</a></code> array may be changed (the length of the array, and the other attributes in <code><a href= "#imagedata">ImageData</a></code> objects, are all read-only). On setting, JS <code>undefined</code> values must be converted to zero. Other values must first be converted to numbers using JavaScript's ToNumber algorithm, and if the result is <del class= "diff-old">not</del> a <del class="diff-old">number,</del> <ins class="diff-chg">NaN value,</ins> a <code>TYPE_MISMATCH_ERR</code> exception must be raised. If the result is less than 0, it must be clamped to zero. If the result is more than 255, it must be clamped to 255. If the number is not an integer, it must be rounded to the nearest integer using the IEEE 754r roundTiesToEven rounding mode. <a href= "#references">[ECMA262]</a> <a href= "#references">[IEEE754R]</a> The width and height ( <var title="">w</var> and <var title="">h</var> ) might be different from the <var title= "">sw</var> and <var title="">sh</var> arguments to the <del class= "diff-old">function,</del> <ins class="diff-chg">above methods,</ins> e.g. if the canvas is backed by a high-resolution <del class="diff-old">bitmap. If the getImageData( sx , sy , sw , sh ) method is called with either</del> <ins class= "diff-chg">bitmap, or if</ins> the <var title="">sw</var> <del class="diff-old">or</del> <ins class="diff-chg">and</ins> <var title="">sh</var> arguments <del class="diff-old">set to zero or negative values, the method must raise an INDEX_SIZE_ERR exception.</del> <ins class="diff-chg">are negative.</ins> The <dfn id="putimagedata" title= "dom-context-2d-putImageData"><code>putImageData( <var title= "">imagedata</var> , <var title="">dx</var> , <var title= "">dy</var> , <var title=""><ins class= "diff-new">dirtyX</ins></var> ,<var title=""><ins class= "diff-new">dirtyY</ins></var> ,<var title=""><ins class= "diff-new">dirtyWidth</ins></var> ,<var title=""><ins class= "diff-new">dirtyHeight</ins></var> )</code></dfn> method <del class="diff-old">must take the given</del> <ins class= "diff-chg">writes data from</ins> <code><a href= "#imagedata">ImageData</a></code> <del class="diff-old">structure, and place it at the specified location ( dx , dy ) in the canvas coordinate space, mapping each pixel represented by</del> <ins class="diff-chg">structures back to</ins> the <del class= "diff-old">ImageData structure into one device pixel.</del> <ins class="diff-chg">canvas.</ins> If the first argument to the method is <ins class= "diff-new">null or</ins> not an <del class="diff-old">object whose [[Class]] property is</del> <code><a href= "#imagedata">ImageData</a> <del class="diff-old">, but all of the following conditions are true,</del></code> <ins class= "diff-chg">object that was returned by</ins> <code title= "dom-context-2d-createImageData"><a href= "#createimagedata"><ins class= "diff-chg">createImageData()</ins></a></code> <ins class= "diff-chg">or</ins> <code title= "dom-context-2d-getImageData"><a href="#getimagedata"><ins class= "diff-chg">getImageData()</ins></a></code> then the <del class= "diff-old">method must treat the first argument as if it was an</del> <code title="dom-context-2d-putImageData"><del class= "diff-old">ImageData</del> <a href="#putimagedata"><ins class= "diff-chg">putImageData()</ins></a></code> <del class= "diff-old">object (and thus not</del> <ins class="diff-chg">method must</ins> raise <del class="diff-old">the</del> <ins class= "diff-chg">a</ins> <code>TYPE_MISMATCH_ERR</code> <del class= "diff-old">exception): The method's first argument is</del> <ins class="diff-chg">exception.</ins> <ins class="diff-chg">If any of the arguments to the method are infinite or NaN, the method must raise</ins> an <del class= "diff-old">object with</del> <code><ins class= "diff-chg">INDEX_SIZE_ERR</ins></code> <ins class= "diff-chg">exception.</ins> <ins class="diff-chg">When the last four arguments are omitted, they must be assumed to have the values 0, 0, the</ins> <code title="dom-imagedata-width"><a href= "#width3">width</a></code> <ins class="diff-new">member of the</ins> <var title=""><ins class="diff-new">imagedata</ins></var> <ins class="diff-new">structure,</ins> and <ins class= "diff-new">the</ins> <code title="dom-imagedata-height"><a href= "#height2">height</a></code> <del class="diff-old">attributes</del> <ins class="diff-chg">member of the</ins> <var title=""><ins class= "diff-chg">imagedata</ins></var> <ins class="diff-chg">structure, respectively.</ins> <ins class="diff-chg">When invoked</ins> with <del class= "diff-old">integer values and a</del> <ins class= "diff-chg">arguments that do not, per the last few paragraphs, cause an exception to be raised, the</ins> <code title= "dom-context-2d-putImageData"><del class="diff-old">data</del> <a href="#putimagedata"><ins class= "diff-chg">putImageData()</ins></a></code> <del class= "diff-old">attribute whose value</del> <ins class="diff-chg">method must act as follows:</ins> <ol> <li> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">dx</ins> <ins class= "diff-chg">device</ins></var> <ins class="diff-chg">be the x-coordinate of the device pixel in the underlying pixel data of the canvas corresponding to the</ins> <var title=""><ins class= "diff-chg">dx</ins></var> <ins class="diff-chg">coordinate in the canvas coordinate space.</ins> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">dy</ins> <ins class= "diff-chg">device</ins></var> <ins class="diff-chg">be the y-coordinate of the device pixel in the underlying pixel data of the canvas corresponding to the</ins> <var title=""><ins class= "diff-chg">dy</ins></var> <ins class="diff-chg">coordinate in the canvas coordinate space.</ins> </li> <li> <ins class="diff-chg">If</ins> <var title=""><ins class= "diff-chg">dirtyWidth</ins></var> is <del class="diff-old">an enumerable list</del> <ins class="diff-chg">negative, let</ins> <var title=""><ins class="diff-chg">dirtyX</ins></var> <ins class= "diff-chg">be</ins> <var title=""><ins class= "diff-chg">dirtyX</ins></var> <ins class="diff-chg">+</ins> <var title=""><ins class="diff-chg">dirtyWidth</ins></var> ,<ins class="diff-chg">and let</ins> <var title=""><ins class= "diff-chg">dirtyWidth</ins></var> <ins class="diff-chg">be equal to the absolute magnitude</ins> of <del class="diff-old">values that are either JS Numbers or</del> <var title=""><ins class= "diff-chg">dirtyWidth</ins></var> . <ins class="diff-chg">If</ins> <var title=""><ins class= "diff-chg">dirtyHeight</ins></var> <ins class="diff-chg">is negative, let</ins> <var title=""><ins class= "diff-chg">dirtyY</ins></var> <ins class="diff-chg">be</ins> <var title=""><ins class="diff-chg">dirtyY</ins></var> <ins class="diff-chg">+</ins> <var title=""><ins class= "diff-chg">dirtyHeight</ins></var> ,<ins class= "diff-chg">and let</ins> <var title=""><ins class= "diff-chg">dirtyHeight</ins></var> <ins class="diff-chg">be equal to</ins> the <del class="diff-old">JS value undefined .</del> <ins class="diff-chg">absolute magnitude of</ins> <var title= ""><ins class="diff-chg">dirtyHeight</ins></var> . </li> <li><del class="diff-old">The</del> <ins class="diff-chg">If</ins> <var title=""><ins class= "diff-chg">dirtyX</ins></var> <ins class="diff-chg">is negative, let</ins> <var title=""><ins class= "diff-chg">dirtyWidth</ins></var> <ins class="diff-chg">be</ins> <del class="diff-old">ImageData</del> <var title= ""><ins class="diff-chg">dirtyWidth</ins></var> <ins class= "diff-chg">+</ins> <var title=""><ins class= "diff-chg">dirtyX</ins></var> ,<ins class="diff-chg">and let</ins> <var title=""><ins class="diff-chg">dirtyX</ins></var> <ins class="diff-chg">be zero.</ins> <ins class="diff-chg">If</ins> <var title=""><ins class= "diff-chg">dirtyY</ins></var> <ins class="diff-chg">is negative, let</ins> <var title=""><ins class= "diff-chg">dirtyHeight</ins></var> <ins class="diff-chg">be</ins> <var title=""><ins class="diff-chg">dirtyHeight</ins></var> <ins class="diff-chg">+</ins> <var title=""><ins class= "diff-chg">dirtyY</ins></var> ,<ins class="diff-chg">and let</ins> <var title=""><ins class="diff-chg">dirtyY</ins></var> <ins class="diff-chg">be zero.</ins> </li> <li> <ins class="diff-chg">If</ins> <var title=""><ins class= "diff-chg">dirtyX</ins></var> <ins class="diff-chg">+</ins> <var title=""><ins class="diff-chg">dirtyWidth</ins></var> <ins class="diff-chg">is greater than the</ins> <code title= "dom-imagedata-width"><a href="#width3"><ins class= "diff-chg">width</ins></a></code> <del class= "diff-old">object's</del> <ins class="diff-chg">attribute of the</ins> <var title=""><ins class="diff-chg">imagedata</ins></var> <ins class="diff-chg">argument, let</ins> <var title=""><ins class= "diff-chg">dirtyWidth</ins></var> <ins class="diff-chg">be the value of that</ins> <code title="dom-imagedata-width"><a href= "#width3">width</a></code> <ins class="diff-new">attribute, minus the value of</ins> <var title=""><ins class= "diff-new">dirtyX</ins></var> . <ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">dirtyY</ins></var> <ins class="diff-new">+</ins> <var title=""><ins class="diff-new">dirtyHeight</ins></var> is greater than <del class="diff-old">zero. The</del> <ins class= "diff-chg">the</ins> <code title="dom-imagedata-height"><del class= "diff-old">ImageData</del> <a href="#height2"><ins class= "diff-chg">height</ins></a></code> <del class= "diff-old">object's</del> <ins class="diff-chg">attribute of the</ins> <var title=""><ins class="diff-chg">imagedata</ins></var> <ins class="diff-chg">argument, let</ins> <var title=""><ins class= "diff-chg">dirtyHeight</ins></var> <ins class="diff-chg">be the value of that</ins> <code title="dom-imagedata-height"><a href= "#height2">height</a></code> <ins class="diff-new">attribute, minus the value of</ins> <var title=""><ins class= "diff-new">dirtyY</ins></var> . </li> <li> <ins class="diff-new">If, after those changes, either</ins> <var title=""><ins class="diff-new">dirtyWidth</ins></var> <ins class="diff-new">or</ins> <var title=""><ins class= "diff-new">dirtyHeight</ins></var> is <del class="diff-old">greater than zero.</del> <ins class="diff-chg">negative or zero, stop these steps without affecting the canvas.</ins> </li> <li><del class="diff-old">The</del> <ins class="diff-chg">Otherwise, for all values of</ins> <var title=""><ins class="diff-chg">x</ins></var> <ins class= "diff-chg">and</ins> <var title=""><ins class= "diff-chg">y</ins></var> <ins class="diff-chg">where</ins> <del class="diff-old">ImageData</del> <var title= ""><ins class="diff-chg">dirtyX</ins></var> <ins class= "diff-chg"> ≤ </ins> <var title=""><ins class= "diff-chg">x</ins></var> <ins class= "diff-chg"> < </ins> <del class= "diff-old">object's</del> <var title=""><ins class= "diff-chg">dirtyX</ins></var> <ins class="diff-chg">+</ins> <var title=""><ins class="diff-chg">dirtyWidth</ins></var> <del class="diff-old">width</del> <del class= "diff-old">multiplied by its</del> <ins class= "diff-chg">and</ins> <del class="diff-old">height</del> <var title=""><ins class="diff-chg">dirtyY</ins></var> <ins class= "diff-chg"> ≤ </ins> <var title=""><ins class= "diff-chg">y</ins></var> <ins class= "diff-chg"> < </ins> <del class= "diff-old">multiplied by 4 is equal to</del> <var title= ""><ins class="diff-chg">dirtyY</ins></var> <ins class= "diff-chg">+</ins> <var title=""><ins class= "diff-chg">dirtyHeight</ins></var> ,<ins class= "diff-chg">copy</ins> the <del class="diff-old">number</del> <ins class="diff-chg">four channels</ins> of <del class= "diff-old">entries</del> <ins class="diff-chg">the pixel with coordinate (</ins> <var title=""><ins class= "diff-chg">x</ins></var> ,<var title=""><ins class= "diff-chg">y</ins></var> <ins class="diff-chg">)</ins> in the <var title=""><ins class="diff-chg">imagedata</ins></var> <ins class="diff-chg">data structure to the pixel with coordinate (</ins> <del class="diff-old">ImageData</del> <var title= ""><ins class="diff-chg">x</ins> <ins class= "diff-chg">device</ins> <del class= "diff-old">object's</del></var> <ins class="diff-chg">+</ins> <var title=""><ins class="diff-chg">x</ins></var> <del class= "diff-old">data</del> , <del class= "diff-old">property. In the</del> <var title=""><ins class= "diff-chg">y</ins> <ins class="diff-chg">device</ins> <del class="diff-old">data</del></var> <ins class= "diff-chg">+</ins> <var title=""><ins class= "diff-chg">y</ins></var> <del class="diff-old">property, undefined values must be treated as zero, any numbers below zero must be clamped to zero, any numbers above 255 must be clamped to 255, and any numbers that are not integers must be rounded to</del> <ins class="diff-chg">) in</ins> the <del class="diff-old">nearest integer using</del> <ins class="diff-chg">underlying pixel data of</ins> the <del class="diff-old">IEEE 754r roundTiesToEven rounding mode. [IEEE754R]</del> <ins class= "diff-chg">canvas.</ins> </li> </ol> The handling of pixel rounding when the specified coordinates do not exactly map to the device coordinate space is not defined by this specification, except that the following must result in no visible changes to the rendering: <pre> context.putImageData(context.getImageData(x, y, w, h), x, y); </pre> ...for any value of <var title="">x</var> and <var title= "">y</var> . In other words, while user agents may round the arguments of the two methods so that they map to device pixel boundaries, any rounding performed must be performed consistently for both the <code title="dom-context-2d-getImageData"><a href= "#getimagedata">getImageData()</a></code> and <code title= "dom-context-2d-putImageData"><a href= "#putimagedata">putImageData()</a></code> operations. The current path, <a href="#transformations0" title= "dom-context-2d-transformation">transformation matrix</a> , <a href="#shadows0" title="shadows">shadow attributes</a> , <a href="#globalalpha" title="dom-context-2d-globalAlpha">global alpha</a> , <ins class="diff-chg">the</ins> <a href="#clipping" title="clipping region">clipping <del class="diff-old">path</del> <ins class="diff-chg">region</ins></a> , and <a href= "#globalcompositeoperation" title= "dom-context-2d-globalCompositeOperation">global composition operator</a> must not affect the <code title= "dom-context-2d-getImageData"><a href= "#getimagedata">getImageData()</a></code> and <code title= "dom-context-2d-putImageData"><a href= "#putimagedata">putImageData()</a></code> methods. <div class="example"> The data returned by <code title= "dom-context-2d-getImageData"><a href= "#getimagedata">getImageData()</a></code> is at the resolution of the canvas backing store, which is likely to not be one device pixel to each CSS pixel if the display used is a high resolution display. Thus, while one could create an <code><a href= "#imagedata">ImageData</a></code> object, one would not necessarily know what resolution the canvas expected (how many pixels the canvas wants to paint over one coordinate space unit pixel). In the following example, the script first obtains the size of the canvas backing store, and then generates a few new <code><a href="#imagedata">ImageData</a></code> objects which can be used. <pre> // canvas is a reference to a <canvas> element <del class= "diff-old"> // (note: this example uses JavaScript 1.7 features) </del> var context = canvas.getContext('2d'); <del class= "diff-old"> var backingStore = context.getImageData(0, 0, canvas.width, canvas.height); var actualWidth = backingStore.width; var actualHeight = backingStore.height; function CreateImageData(w, h) { return { height: h, width: w, data: [i for (i in function (n) { for (let i = 0; i < n; i += 1) yield 0 }(w*h*4)) ] }; } </del> // create a blank slate <del class= "diff-old"> var data = CreateImageData(actualWidth, actualHeight); </del> <ins class= "diff-chg"> var data = context.createImageData(canvas.width, canvas.height); </ins> // create some plasma FillPlasma(data, 'green'); // green plasma // add a cloud to the plasma <del class= "diff-old"> AddCloud(data, actualWidth/2, actualHeight/2); // put a cloud in the middle </del> <ins class= "diff-chg"> AddCloud(data, data.width/2, data.height/2); // put a cloud in the middle </ins> // paint the plasma+cloud on the canvas context.putImageData(data, 0, 0); // support methods function FillPlasma(data, color) { ... } <del class="diff-old"> function AddCload(data, x, y) { ... } </del> <ins class="diff-chg"> function AddCloud(data, x, y) { ... } </ins> </pre></div> <div class="example"> Here is an example of using <code title= "dom-context-2d-getImageData"><a href= "#getimagedata">getImageData()</a></code> and <code title= "dom-context-2d-putImageData"><a href= "#putimagedata">putImageData()</a></code> to implement an edge detection filter. <pre> <!DOCTYPE HTML> <html> <head> <title>Edge detection demo</title> <script> var image = new Image(); function init() { image.onload = demo; image.src = "image.jpeg"; } function demo() { var canvas = document.getElementsByTagName('canvas')[0]; var context = canvas.getContext('2d'); // draw the image onto the canvas context.drawImage(image, 0, 0); // get the image data to manipulate var input = context.getImageData(0, 0, canvas.width, canvas.height); <del class="diff-old"> // edge detection </del> <ins class= "diff-chg"> // get an empty slate to put the data into var output = context.crateImageData(canvas.width, canvas.height); // alias some variables for convenience </ins> // notice that we are using input.width and input.height here // as they might not be the same as canvas.width and canvas.height // (in particular, they might be different on high-res displays) var w = input.width, h = input.height; var inputData = input.data; <del class="diff-old"> var outputData = new Array(w*h*4); </del> <ins class="diff-chg"> var outputData = output.data; // edge detection </ins> for (var y = 1; y < h-1; y += 1) { for (var x = 1; x < w-1; x += 1) { for (var c = 0; c < 3; c += 1) { var i = (y*w + x)*4 + c; outputData[i] = 127 + -inputData[i - w*4 - 4] - inputData[i - w*4] - inputData[i - w*4 + 4] + -inputData[i - 4] + 8*inputData[i] - inputData[i + 4] + -inputData[i + w*4 - 4] - inputData[i + w*4] - inputData[i + w*4 + 4]; } outputData[(y*w + x)*4 + 3] = 255; // alpha } } // put the image data back after manipulation <del class="diff-old"> var output = { width: w, height: h, data: outputData }; </del> context.putImageData(output, 0, 0); } </script> </head> <body onload="init()"> <canvas></canvas> </body> </html> </pre></div> <h6 id="drawing"><del class= "diff-old">3.14.11.1.11.</del> <ins class= "diff-chg">3.12.11.1.12.</ins> Drawing model</h6> When a shape or image is painted, user agents must follow these steps, in the order given (or act as if they do): <ol> <li> Render the shape or image, creating image <var title="">A</var> , as described in the previous sections. For shapes, the current fill, stroke, and line styles must be <del class= "diff-old">honoured,</del> <ins class="diff-chg">honored,</ins> and the stroke must itself also be subjected to the current transformation matrix. </li> <li> If shadows are supported: <ol> <li> Render the shadow from image <var title="">A</var> , using the current shadow styles, creating image <var title="">B</var> . </li> <li> Multiply the alpha component of every pixel in <var title= "">B</var> by <code title="dom-context-2d-globalAlpha"><a href= "#globalalpha">globalAlpha</a></code> . </li> <li> Within the clipping <del class="diff-old">path,</del> <ins class="diff-chg">region,</ins> composite <var title="">B</var> over the current canvas bitmap using the current composition operator. </li> </ol> </li> <li> Multiply the alpha component of every pixel in <var title= "">A</var> by <code title="dom-context-2d-globalAlpha"><a href= "#globalalpha">globalAlpha</a></code> . </li> <li> Within the clipping <del class="diff-old">path,</del> <ins class="diff-chg">region,</ins> composite <var title="">A</var> over the current canvas bitmap using the current composition operator. </li> </ol> <h5 id="color"><del class= "diff-old">3.14.11.2.</del> <ins class= "diff-chg">3.12.11.2.</ins> Color spaces and color correction</h5> The <code><a href="#canvas">canvas</a></code> APIs must perform <del class="diff-old">colour</del> <ins class= "diff-chg">color</ins> correction at only two points: when rendering images with their own gamma correction <ins class= "diff-new">and color space</ins> information onto the canvas, to convert the image to the color space used by the canvas (e.g. using the <code title="dom-context-2d-drawImage"><a href= "#drawimage">drawImage()</a></code> method with an <code><a href= "#htmlimageelement">HTMLImageElement</a></code> object), and when rendering the actual canvas bitmap to the output device. Thus, in the 2D context, colors used to draw shapes onto the canvas will exactly match colors obtained through the <code title="dom-context-2d-getImageData"><a href= "#getimagedata">getImageData()</a></code> method. The <code title="dom-canvas-toDataURL"><a href= "#todataurl">toDataURL()</a></code> method must not include color space information in the resource returned. <ins class= "diff-new">Where the output format allows it, the color of pixels in resources created by</ins> <code title= "dom-canvas-toDataURL"><a href="#todataurl"><ins class= "diff-new">toDataURL()</ins></a></code> <ins class="diff-new">must match those returned by the</ins> <code title= "dom-context-2d-getImageData"><a href="#getimagedata"><ins class= "diff-new">getImageData()</ins></a></code> <ins class= "diff-new">method.</ins> In user agents that support CSS, the color space used by a <code><a href="#canvas">canvas</a></code> element must match the color space used for processing any colors for that element in CSS. <ins class="diff-new">The gamma correction and color space information of images must be handled in such a way that an image rendered directly using an</ins> <code><a href="#img"><ins class= "diff-new">img</ins></a></code> <ins class="diff-new">element would use the same colors as one painted on a</ins> <code><a href= "#canvas"><ins class="diff-new">canvas</ins></a></code> <ins class= "diff-new">element that is then itself rendered. Furthermore, the rendering of images that have no color correction information (such as those returned by the</ins> <code title= "dom-canvas-toDataURL"><a href="#todataurl"><ins class= "diff-new">toDataURL()</ins></a></code> <ins class= "diff-new">method) must be rendered with no color correction.</ins> <ins class="diff-new">Thus, in the 2D context, calling the</ins> <code title="dom-context-2d-drawImage"><a href= "#drawimage"><ins class="diff-new">drawImage()</ins></a></code> <ins class="diff-new">method to render the output of the</ins> <code title="dom-canvas-toDataURL"><a href="#todataurl"><ins class= "diff-new">toDataURL()</ins></a></code> <ins class= "diff-new">method to the canvas, given the appropriate dimensions, has no visible effect.</ins> <h5 id="security1"><ins class= "diff-new">3.12.11.3.</ins> <ins class="diff-new">Security with</ins> <code><a href="#canvas"><ins class= "diff-new">canvas</ins></a></code> <ins class= "diff-new">elements</ins></h5> <ins class="diff-new">Information leakage</ins> <ins class="diff-new">can occur if scripts from one</ins> <a href= "#origin0"><ins class="diff-new">origin</ins></a> <ins class= "diff-new">are exposed to images from another origin (one that isn't the</ins> <a href="#same-origin" title= "same origin"><ins class="diff-new">same</ins></a> <ins class= "diff-new">).</ins> <ins class="diff-new">To mitigate this,</ins> <code><a href= "#canvas"><ins class="diff-new">canvas</ins></a></code> <ins class= "diff-new">elements are defined to have a flag indicating whether they are</ins> <ins class="diff-new">origin-clean</ins> .<ins class="diff-new">All</ins> <code><a href= "#canvas"><ins class="diff-new">canvas</ins></a></code> <ins class= "diff-new">elements must start with their</ins> <ins class= "diff-new">origin-clean</ins> <ins class="diff-new">set to true. The flag must be set to false if any of the following actions occur:</ins> <ul> <li> <ins class="diff-new">The element's 2D context's</ins> <code title="dom-context-2d-drawImage"><a href= "#drawimage"><ins class="diff-new">drawImage()</ins></a></code> <ins class="diff-new">method is called with an</ins> <code><a href= "#htmlimageelement"><ins class= "diff-new">HTMLImageElement</ins></a></code> <ins class= "diff-new">whose</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">is not the</ins> <a href="#same-origin" title="same origin"><ins class= "diff-new">same</ins></a> <ins class="diff-new">as that of the</ins> <code><ins class="diff-new">Document</ins></code> <ins class="diff-new">object that owns the</ins> <code><a href= "#canvas"><ins class="diff-new">canvas</ins></a></code> <ins class= "diff-new">element.</ins> </li> <li> <ins class="diff-new">The element's 2D context's</ins> <code title="dom-context-2d-drawImage"><a href= "#drawimage"><ins class="diff-new">drawImage()</ins></a></code> <ins class="diff-new">method is called with an</ins> <code><a href= "#htmlcanvaselement"><ins class= "diff-new">HTMLCanvasElement</ins></a></code> <ins class= "diff-new">whose</ins> <ins class= "diff-new">origin-clean</ins> <ins class="diff-new">flag is false.</ins> </li> <li> <ins class="diff-new">The element's 2D context's</ins> <code title="dom-context-2d-fillStyle"><a href= "#fillstyle"><ins class="diff-new">fillStyle</ins></a></code> <ins class="diff-new">attribute is set to a</ins> <code><a href= "#canvaspattern0"><ins class= "diff-new">CanvasPattern</ins></a></code> <ins class= "diff-new">object that was created from an</ins> <code><a href= "#htmlimageelement"><ins class= "diff-new">HTMLImageElement</ins></a></code> <ins class= "diff-new">whose</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">is not the</ins> <a href="#same-origin" title="same origin"><ins class= "diff-new">same</ins></a> <ins class="diff-new">as that of the</ins> <code><ins class="diff-new">Document</ins></code> <ins class="diff-new">object that owns the</ins> <code><a href= "#canvas"><ins class="diff-new">canvas</ins></a></code> <ins class= "diff-new">element.</ins> </li> <li> <ins class="diff-new">The element's 2D context's</ins> <code title="dom-context-2d-fillStyle"><a href= "#fillstyle"><ins class="diff-new">fillStyle</ins></a></code> <ins class="diff-new">attribute is set to a</ins> <code><a href= "#canvaspattern0"><ins class= "diff-new">CanvasPattern</ins></a></code> <ins class= "diff-new">object that was created from an</ins> <code><a href= "#htmlcanvaselement"><ins class= "diff-new">HTMLCanvasElement</ins></a></code> <ins class= "diff-new">whose</ins> <ins class= "diff-new">origin-clean</ins> <ins class="diff-new">flag is false.</ins> </li> <li> <ins class="diff-new">The element's 2D context's</ins> <code title="dom-context-2d-strokeStyle"><a href= "#strokestyle"><ins class="diff-new">strokeStyle</ins></a></code> <ins class="diff-new">attribute is set to a</ins> <code><a href= "#canvaspattern0"><ins class= "diff-new">CanvasPattern</ins></a></code> <ins class= "diff-new">object that was created from an</ins> <code><a href= "#htmlimageelement"><ins class= "diff-new">HTMLImageElement</ins></a></code> <ins class= "diff-new">whose</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">is not the</ins> <a href="#same-origin" title="same origin"><ins class= "diff-new">same</ins></a> <ins class="diff-new">as that of the</ins> <code><ins class="diff-new">Document</ins></code> <ins class="diff-new">object that owns the</ins> <code><a href= "#canvas"><ins class="diff-new">canvas</ins></a></code> <ins class= "diff-new">element.</ins> </li> <li> <ins class="diff-new">The element's 2D context's</ins> <code title="dom-context-2d-strokeStyle"><a href= "#strokestyle"><ins class="diff-new">strokeStyle</ins></a></code> <ins class="diff-new">attribute is set to a</ins> <code><a href= "#canvaspattern0"><ins class= "diff-new">CanvasPattern</ins></a></code> <ins class= "diff-new">object that was created from an</ins> <code><a href= "#htmlcanvaselement"><ins class= "diff-new">HTMLCanvasElement</ins></a></code> <ins class= "diff-new">whose</ins> <ins class= "diff-new">origin-clean</ins> <ins class="diff-new">flag is false.</ins> </li> </ul> <ins class="diff-new">Whenever the</ins> <code title= "dom-canvas-toDataURL"><a href="#todataurl"><ins class= "diff-new">toDataURL()</ins></a></code> <ins class= "diff-new">method of a</ins> <code><a href="#canvas"><ins class= "diff-new">canvas</ins></a></code> <ins class="diff-new">element whose</ins> <ins class="diff-new">origin-clean</ins> <ins class="diff-new">flag is set to false is called, the method must immediately raise a security exception.</ins> <ins class="diff-new">Whenever the</ins> <code title= "dom-context-2d-getImageData"><a href="#getimagedata"><ins class= "diff-new">getImageData()</ins></a></code> <ins class= "diff-new">method of the 2D context of a</ins> <code><a href= "#canvas"><ins class="diff-new">canvas</ins></a></code> <ins class= "diff-new">element whose</ins> <ins class= "diff-new">origin-clean</ins> <ins class="diff-new">flag is set to false is called, the method must immediately raise a security exception.</ins> <h4 id="the-map"><del class= "diff-old">3.14.12.</del> <ins class= "diff-chg">3.12.12</ins> The <dfn id= "map"><code>map</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><del class="diff-old">None, but the</del> <del class= "diff-old">id</del> <code title="attr-map-name"><a href= "#name7"><ins class="diff-chg">name</ins></a></code> <del class= "diff-old">global attribute has special requirements on this element.</del></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id="htmlmapelement">HTMLMapElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { <ins class="diff-new"> attribute DOMString <a href= "#name8" title="dom-map-name">name</a>; </ins> readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#areas" title= "dom-map-areas">areas</a>; readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#images1" title= "dom-map-images">images</a>; }; </pre></dd> </dl> The <code><a href="#map">map</a></code> element, in <del class= "diff-old">conjuction</del> <ins class="diff-chg">conjunction</ins> with any <code><a href="#area">area</a></code> element descendants, defines an <a href="#image">image map</a> . <del class="diff-old">There</del> <ins class= "diff-chg">The</ins> <dfn id="name7" title= "attr-map-name"><code><ins class="diff-chg">name</ins></code></dfn> <ins class="diff-chg">attribute gives the map a name so that it can be referenced. The attribute</ins> must <del class= "diff-old">always</del> be <del class="diff-old">an</del> <ins class="diff-chg">present and must have a non-empty value. Whitespace is significant in this attribute's value. If the</ins> <code title="attr-id"><a href="#id">id</a></code> attribute <del class="diff-old">present on map elements.</del> <ins class= "diff-chg">is also specified, both attributes must have the same value.</ins> The <dfn id="areas" title= "dom-map-areas"><code>areas</code></dfn> attribute must return an <code><a href="#htmlcollection0">HTMLCollection</a></code> rooted at the <code><a href="#map">map</a></code> element, whose filter matches only <code><a href="#area">area</a></code> elements. The <dfn id="images1" title= "dom-map-images"><code>images</code></dfn> attribute must return an <code><a href="#htmlcollection0">HTMLCollection</a></code> rooted at the <code>Document</code> node, whose filter matches only <code><a href="#img">img</a></code> and <code><a href= "#object">object</a></code> elements that are associated with this <code><a href="#map">map</a></code> element according to the <a href="#image">image map</a> processing model. <ins class="diff-new">The DOM attribute</ins> <dfn id="name8" title="dom-map-name"><code><ins class= "diff-new">name</ins></code></dfn> <ins class="diff-new">must</ins> <a href="#reflect"><ins class="diff-new">reflect</ins></a> <ins class="diff-new">the content attribute of the same name.</ins> <h4 id="the-area"><del class= "diff-old">3.14.13.</del> <ins class= "diff-chg">3.12.13</ins> The <dfn id= "area"><code>area</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#phrasing0">phrasing content</a> is expected, but only if there is a <code><a href="#map">map</a></code> element ancestor.</dd> <dt>Content model:</dt> <dd>Empty.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-area-alt"><a href="#alt1">alt</a></code></dd> <dd><code title="attr-area-coords"><a href= "#coords">coords</a></code></dd> <dd><code title="attr-area-shape"><a href= "#shape">shape</a></code></dd> <dd><code title="attr-hyperlink-href"><a href= "#href6">href</a></code></dd> <dd><code title="attr-hyperlink-target"><a href= "#target3">target</a></code></dd> <dd><code title="attr-hyperlink-ping"><a href= "#ping">ping</a></code></dd> <dd><code title="attr-hyperlink-rel"><a href= "#rel3">rel</a></code></dd> <dd><code title="attr-hyperlink-media"><a href= "#media12">media</a></code></dd> <dd><code title="attr-hyperlink-hreflang"><a href= "#hreflang3">hreflang</a></code></dd> <dd><code title="attr-hyperlink-type"><a href= "#type17">type</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlareaelement">HTMLAreaElement</dfn> : <a href="#htmlelement">HTMLElement</a> { attribute DOMString <a href="#alt2" title= "dom-area-alt">alt</a>; attribute DOMString <a href="#coords0" title= "dom-area-coords">coords</a>; attribute DOMString <a href="#shape0" title= "dom-area-shape">shape</a>; attribute DOMString <a href="#href4" title= "dom-area-href">href</a>; attribute DOMString <a href="#target2" title= "dom-area-target">target</a>; attribute DOMString <a href="#ping1" title= "dom-area-ping">ping</a>; attribute DOMString <a href="#rel2" title= "dom-area-rel">rel</a>; readonly attribute DOMTokenList <a href="#rellist1" title= "dom-area-relList">relList</a>; attribute DOMString <a href="#media11" title= "dom-area-media">media</a>; attribute DOMString <a href="#hreflang2" title= "dom-area-hreflang">hreflang</a>; attribute DOMString <a href="#type10" title= "dom-area-type">type</a>; }; </pre></dd> </dl> The <code><a href="#area">area</a></code> element represents either a hyperlink with some text and a corresponding area on an <a href="#image">image map</a> , or a dead area on an image map. If the <code><a href="#area">area</a></code> element has an <code title="attr-hyperlink-href"><a href="#href6">href</a></code> attribute, then the <code><a href="#area">area</a></code> element represents a <a href="#hyperlinks">hyperlink</a> ; the <dfn id= "alt1" title="attr-area-alt"><code>alt</code></dfn> attribute, which must then be present, specifies the text. However, if the <code><a href="#area">area</a></code> element has no <code title="attr-hyperlink-href"><a href= "#href6">href</a></code> attribute, then the area represented by the element cannot be selected, and the <code title= "attr-area-alt"><a href="#alt1">alt</a></code> attribute must be omitted. In both cases, the <code title="attr-area-shape"><a href= "#shape">shape</a></code> and <code title= "attr-area-coords"><a href="#coords">coords</a></code> attributes specify the area. The <dfn id="shape" title= "attr-area-shape"><code>shape</code></dfn> attribute is an <a href= "#enumerated">enumerated attribute</a> . The following table lists the keywords defined for this attribute. The states given in the first cell of the <del class="diff-old">the</del> rows with keywords give the states to which those keywords map. Some of the keywords are non-conforming, as noted in the last column. <table> <thead> <tr> <th>State</th> <th>Keywords</th> <th>Notes</th> </tr> </thead> <tbody> <tr> <td rowspan="2"><dfn id="circle" title= "attr-area-shape-circle">Circle state</dfn></td> <td><code title="">circ</code></td> <td>Non-conforming</td> </tr> <tr> <td><code title="">circle</code></td> <td></td> </tr> <tr> <td><dfn id="default0" title="attr-area-shape-default">Default state</dfn></td> <td><code title="">default</code></td> <td></td> </tr> <tr> <td rowspan="2"><dfn id="polygon" title= "attr-area-shape-poly">Polygon state</dfn></td> <td><code title="">poly</code></td> <td></td> </tr> <tr> <td><code title="">polygon</code></td> <td>Non-conforming</td> </tr> <tr> <td rowspan="2"><dfn id="rectangle" title= "attr-area-shape-rect">Rectangle state</dfn></td> <td><code title="">rect</code></td> <td></td> </tr> <tr> <td><code title="">rectangle</code></td> <td>Non-conforming</td> </tr> </tbody> </table> The attribute may be <del class="diff-old">ommited.</del> <ins class="diff-chg">omitted.</ins> The missing value default is the <a href="#rectangle" title= "attr-area-shape-rect">rectangle</a> state. The <dfn id="coords" title= "attr-area-coords"><code>coords</code></dfn> attribute must, if specified, contain a <a href="#valid4">valid list of integers</a> . This attribute gives the coordinates for the shape described by the <code title="attr-area-shape"><a href="#shape">shape</a></code> attribute. The processing for this attribute is described as part of the <a href="#image">image map</a> processing model. In the <a href="#circle" title="attr-area-shape-circle">circle state</a> , <code><a href="#area">area</a></code> elements must have a <code title="attr-area-coords"><a href= "#coords">coords</a></code> attribute present, with three integers, the last of which must be non-negative. The first integer must be the distance in CSS pixels from the left edge of the image to the center of the circle, the second integer must be the distance in CSS pixels from the top edge of the image to the center of the circle, and the third integer must be the radius of the circle, again in CSS pixels. In the <a href="#default0" title= "attr-area-shape-default">default state</a> state, <code><a href= "#area">area</a></code> elements must not have a <code title= "attr-area-coords"><a href="#coords">coords</a></code> attribute. In the <a href="#polygon" title="attr-area-shape-poly">polygon state</a> , <code><a href="#area">area</a></code> elements must have a <code title="attr-area-coords"><a href= "#coords">coords</a></code> attribute with at least six integers, and the number of integers must be even. Each pair of integers must represent a coordinate given as the distances from the left and the top of the image in CSS pixels respectively, and all the coordinates together must represent the points of the polygon, in order. In the <a href="#rectangle" title= "attr-area-shape-rect">rectangle state</a> , <code><a href= "#area">area</a></code> elements must have a <code title= "attr-area-coords"><a href="#coords">coords</a></code> attribute with exactly four integers, the first of which must be less than the third, and the second of which must be less than the fourth. The four points must represent, respectively, the distance from the left edge of the image to the top left side of the rectangle, the distance from the top edge to the top side, the distance from the left edge to the right side, and the distance from the top edge to the bottom side, all in CSS pixels. When user agents allow users to <a href="#following0" title= "following hyperlinks">follow hyperlinks</a> created using the <code><a href="#area">area</a></code> element, as described in the next section, the <code title="attr-hyperlink-href"><a href= "#href6">href</a></code> , <code title= "attr-hyperlink-target"><a href="#target3">target</a></code> and <code title="attr-hyperlink-ping"><a href="#ping">ping</a></code> attributes decide how the link is followed. The <code title= "attr-hyperlink-rel"><a href="#rel3">rel</a></code> , <code title= "attr-hyperlink-media"><a href="#media12">media</a></code> , <code title="attr-hyperlink-hreflang"><a href= "#hreflang3">hreflang</a></code> , and <code title= "attr-hyperlink-type"><a href="#type17">type</a></code> attributes may be used to indicate to the user the likely nature of the target resource before the user follows the link. The <code title="attr-hyperlink-target"><a href= "#target3">target</a></code> , <code title= "attr-hyperlink-ping"><a href="#ping">ping</a></code> , <code title="attr-hyperlink-rel"><a href="#rel3">rel</a></code> , <code title="attr-hyperlink-media"><a href= "#media12">media</a></code> , <code title= "attr-hyperlink-hreflang"><a href="#hreflang3">hreflang</a></code> , and <code title="attr-hyperlink-type"><a href= "#type17">type</a></code> attributes must be omitted if the <code title="attr-hyperlink-href"><a href="#href6">href</a></code> attribute is not present. The <a href="#activation0">activation behavior</a> of <code><a href="#area">area</a></code> elements is to run the following steps: <ol> <li>If the <code title="event-DOMActivate">DOMActivate</code> event in question is not trusted (i.e. a <code title= "dom-click"><a href="#click">click()</a></code> method call was the reason for the event being dispatched), and the <code><a href= "#area">area</a></code> element's <code title= "attr-area-target">target</code> attribute is ... then raise an <code>INVALID_ACCESS_ERR</code> exception.</li> <li>Otherwise, the user agent must <a href="#following0" title= "following hyperlinks">follow the hyperlink</a> defined by the <code><a href="#area">area</a></code> element, if any.</li> </ol> One way that a user agent can enable users to follow hyperlinks is by allowing <code><a href= "#area">area</a></code> elements to be clicked, or focussed and activated by the keyboard. This will cause the aforementioned <a href="#activation0">activation behavior</a> to be invoked. The DOM attributes <dfn id="alt2" title= "dom-area-alt"><code>alt</code></dfn> , <dfn id="coords0" title= "dom-area-coords"><code>coords</code></dfn> , <del class= "diff-old">shape ,</del> <dfn id="href4" title= "dom-area-href"><code>href</code></dfn> , <dfn id="target2" title= "dom-area-target"><code>target</code></dfn> , <dfn id="ping1" title="dom-area-ping"><code>ping</code></dfn> , <dfn id="rel2" title="dom-area-rel"><code>rel</code></dfn> , <dfn id="media11" title="dom-area-media"><code>media</code></dfn> , <dfn id= "hreflang2" title="dom-area-hreflang"><code>hreflang</code></dfn> , and <dfn id="type10" title="dom-area-type"><code>type</code></dfn> , each must <a href="#reflect">reflect</a> the respective content attributes of the same name. The DOM attribute <dfn id="shape0" title= "dom-area-shape"><code><ins class= "diff-new">shape</ins></code></dfn> <ins class= "diff-new">must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the</ins> <code title="attr-area-shape"><a href="#shape"><ins class= "diff-new">shape</ins></a></code> <ins class="diff-new">content attribute,</ins> <a href="#limited0"><ins class="diff-new">limited to only known values</ins></a> . <ins class="diff-new">The DOM attribute</ins> <dfn id="rellist1" title="dom-area-rellist"><code>relList</code></dfn> must <a href= "#reflect">reflect</a> the <code title= "attr-hyperlink-rel"><a href="#rel3">rel</a></code> content attribute. <h4 id="image-maps"><del class= "diff-old">3.14.14.</del> <ins class= "diff-chg">3.12.14</ins> Image maps</h4> An <dfn id="image">image map</dfn> allows geometric areas on an image to be associated with <a href="#hyperlinks" title= "hyperlink">hyperlinks</a> . An image, in the form of an <code><a href="#img">img</a></code> element or an <code><a href="#object">object</a></code> element representing an image, may be associated with an image map (in the form of a <code><a href="#map">map</a></code> element) by specifying a <dfn id="usemap1" title= "attr-hyperlink-usemap"><code>usemap</code></dfn> attribute on the <code><a href="#img">img</a></code> or <code><a href= "#object">object</a></code> element. The <code title= "attr-area-usemap">usemap</code> attribute, if specified, must be a <a href="#valid7">valid <del class="diff-old">hashed ID</del> <ins class="diff-chg">hash-name</ins> reference</a> to a <code><a href="#map">map</a></code> element. If an <code><a href="#img">img</a></code> element or an <code><a href="#object">object</a></code> element representing an image has a <code title="attr-area-usemap">usemap</code> attribute specified, user agents must process it as follows: <ol> <li> First, <a href="#rules5">rules for parsing a <del class= "diff-old">hashed ID</del> <ins class="diff-chg">hash-name</ins> reference</a> to a <code><a href="#map">map</a></code> element must be followed. This will return either an element (the <var title= "">map</var> ) or null. </li> <li> If that returned null, then abort these steps. The image is not associated with an image map after all. </li> <li> Otherwise, the user agent must collect all the <code><a href= "#area">area</a></code> elements that are descendants of the <var title="">map</var> . Let those be the <var title= "">areas</var> . </li> </ol> Having obtained the list of <code><a href= "#area">area</a></code> elements that form the image map (the <var title="">areas</var> ), interactive user agents must process the list in one of two ways. If the user agent intends to show the text that the <code><a href="#img">img</a></code> element represents, then it must use the following steps. In user agents that do not support images, or that have images disabled, <code><a href="#object">object</a></code> elements cannot represent images, and thus this section never applies (the <a href="#fallback">fallback content</a> is shown instead). The following steps therefore only apply to <code><a href="#img">img</a></code> elements. <ol> <li> Remove all the <code><a href="#area">area</a></code> elements in <var title="">areas</var> that have no <code title= "attr-hyperlink-href"><a href="#href6">href</a></code> attribute. </li> <li> Remove all the <code><a href="#area">area</a></code> elements in <var title="">areas</var> that have no <code title= "attr-area-alt"><a href="#alt1">alt</a></code> attribute, or whose <code title="attr-area-alt"><a href="#alt1">alt</a></code> attribute's value is the empty string, if there is another <code><a href="#area">area</a></code> element in <var title= "">areas</var> with the same value in the <code title= "attr-hyperlink-href"><a href="#href6">href</a></code> attribute and with a non-empty <code title="attr-area-alt"><a href= "#alt1">alt</a></code> attribute. </li> <li> Each remaining <code><a href="#area">area</a></code> element in <var title="">areas</var> represents a <a href= "#hyperlinks">hyperlink</a> . Those hyperlinks should all be made available to the user in a manner associated with the text of the <code><a href="#img">img</a> <del class="diff-old">or input element.</del></code> . In this context, user agents may represent <code><a href= "#area">area</a></code> and <code><a href="#img">img</a></code> elements with no specified <code title="">alt</code> attributes, or whose <code title="">alt</code> attributes are the empty string or some other non-visible text, in a user-agent-defined fashion intended to indicate the lack of suitable author-provided text. </li> </ol> If the user agent intends to show the image and allow interaction with the image to select hyperlinks, then the image must be associated with a set of layered shapes, taken from the <code><a href="#area">area</a></code> elements in <var title= "">areas</var> , in reverse tree order (so the last specified <code><a href="#area">area</a></code> element in the <var title= "">map</var> is the bottom-most shape, and the first element in the <var title="">map</var> , in tree order, is the top-most shape). Each <code><a href="#area">area</a></code> element in <var title="">areas</var> must be processed as follows to obtain a shape to layer onto the image: <ol> <li> Find the state that the element's <code title= "attr-area-shape"><a href="#shape">shape</a></code> attribute represents. </li> <li> Use the <a href="#rules3">rules for parsing a list of integers</a> to parse the element's <code title= "attr-area-coords"><a href="#coords">coords</a></code> attribute, if it is present, and let the result be the <var title= "">coords</var> list. If the attribute is absent, let the <var title="">coords</var> list be the empty list. </li> <li> If the number of items in the <var title="">coords</var> list is less than the minimum number given for the <code><a href= "#area">area</a></code> element's current state, as per the following table, then the shape is empty; abort these steps. <table> <thead> <tr> <th>State</th> <th>Minimum number of items</th> </tr> </thead> <tbody> <tr> <td><a href="#circle" title="attr-area-shape-circle">Circle state</a></td> <td>3</td> </tr> <tr> <td><a href="#default0" title="attr-area-shape-default">Default state</a></td> <td>0</td> </tr> <tr> <td><a href="#polygon" title="attr-area-shape-poly">Polygon state</a></td> <td>6</td> </tr> <tr> <td><a href="#rectangle" title="attr-area-shape-rect">Rectangle state</a></td> <td>4</td> </tr> </tbody> </table> </li> <li> Check for excess items in the <var title="">coords</var> list as per the entry in the following list corresponding to the <code title="attr-area-shape"><a href="#shape">shape</a></code> attribute's state: <dl class="switch"> <dt><a href="#circle" title="attr-area-shape-circle">Circle state</a></dt> <dd>Drop any items in the list beyond the third.</dd> <dt><a href="#default0" title="attr-area-shape-default">Default state</a></dt> <dd>Drop all items in the list.</dd> <dt><a href="#polygon" title="attr-area-shape-poly">Polygon state</a></dt> <dd>Drop the last item if there's an odd number of items.</dd> <dt><a href="#rectangle" title="attr-area-shape-rect">Rectangle state</a></dt> <dd>Drop any items in the list beyond the fourth.</dd> </dl> </li> <li> If the <code title="attr-area-shape"><a href= "#shape">shape</a></code> attribute represents the <a href= "#rectangle" title="attr-area-shape-rect">rectangle state</a> , and the first number in the list is numerically less than the third number in the list, then swap those two numbers around. </li> <li> If the <code title="attr-area-shape"><a href= "#shape">shape</a></code> attribute represents the <a href= "#rectangle" title="attr-area-shape-rect">rectangle state</a> , and the second number in the list is numerically less than the fourth number in the list, then swap those two numbers around. </li> <li> If the <code title="attr-area-shape"><a href= "#shape">shape</a></code> attribute represents the <a href= "#circle" title="attr-area-shape-circle">circle state</a> , and the third number in the list is less than or equal to zero, then the shape is empty; abort these steps. </li> <li> Now, the shape represented by the element is the one described for the entry in the list below corresponding to the state of the <code title="attr-area-shape"><a href="#shape">shape</a></code> attribute: <dl class="switch"> <dt><a href="#circle" title="attr-area-shape-circle">Circle state</a></dt> <dd> Let <var title="">x</var> be the first number in <var title= "">coords</var> , <var title="">y</var> be the second number, and <var title="">r</var> be the third number. The shape is a circle whose center is <var title="">x</var> CSS pixels from the left edge of the image and <var title="">x</var> CSS pixels from the top edge of the image, and whose radius is <var title="">r</var> pixels. </dd> <dt><a href="#default0" title="attr-area-shape-default">Default state</a></dt> <dd> The shape is a rectangle that exactly covers the entire image. </dd> <dt><a href="#polygon" title="attr-area-shape-poly">Polygon state</a></dt> <dd> Let <var title="">x <var title= "">i</var></var> be the (2 <var title="">i</var> ) th entry in <var title="">coords</var> , and <var title= "">y <var title="">i</var></var> be the (2 <var title="">i</var> +1) th entry in <var title= "">coords</var> (the first entry in <var title="">coords</var> being the one with index 0). Let <var title="">the coordinates</var> be ( <var title="">x <var title="">i</var></var> , <var title="">y <var title="">i</var></var> ), interpreted in CSS pixels measured from the top left of the image, for all integer values of <var title="">i</var> from 0 to ( <var title= "">N</var> /2)-1 , where <var title="">N</var> is the number of items in <var title="">coords</var> . The shape is a polygon whose vertices are given by <var title= "">the coordinates</var> , and whose interior is established using the even-odd rule. <a href="#references">[GRAPHICS]</a> </dd> <dt><a href="#rectangle" title="attr-area-shape-rect">Rectangle state</a></dt> <dd> Let <var title="">x1</var> be the first number in <var title= "">coords</var> , <var title="">y1</var> be the second number, <var title="">x2</var> be the third number, and <var title= "">y2</var> be the fourth number. The shape is a rectangle whose top-left corner is given by the coordinate ( <var title="">x1</var> , <var title="">y1</var> ) and whose bottom right corner is given by the coordinate ( <var title= "">x2</var> , <var title="">y2</var> ), those coordinates being interpreted as CSS pixels from the top left corner of the image. </dd> </dl> For historical reasons, the coordinates must be interpreted relative to the displayed image, even if it stretched using CSS or the image element's <code title="">width</code> and <code title="">height</code> attributes. </li> </ol> Mouse clicks on an image associated with a set of layered shapes per the above algorithm must be dispatched to the top-most shape covering the point that the pointing device indicated (if any), and then, must be dispatched again (with a new <code>Event</code> object) to the image element itself. User agents may also allow individual <code><a href="#area">area</a></code> elements representing <a href="#hyperlinks" title="hyperlink">hyperlinks</a> to be selected and activated (e.g. using a keyboard); events from this are not also propagated to the image. Because a <code><a href="#map">map</a></code> element (and its <code><a href="#area">area</a></code> elements) can be associated with multiple <code><a href="#img">img</a></code> and <code><a href="#object">object</a></code> elements, it is possible for an <code><a href="#area">area</a></code> element to correspond to multiple focusable areas of the document. Image maps are <a href="#live">live</a> ; if the DOM is mutated, then the user agent must act as if it had rerun the algorithms for image maps. <h4 id="mathml"><ins class= "diff-new">3.12.15</ins> <ins class= "diff-new">MathML</ins></h4> <ins class="diff-new">The</ins> <code><ins class= "diff-new">math</ins></code> <ins class="diff-new">element from the</ins> <a href="#mathml0"><ins class="diff-new">MathML namespace</ins></a> <ins class="diff-new">falls into the</ins> <a href="#embedded1"><ins class="diff-new">embedded content</ins></a> <ins class="diff-new">category for the purposes of the content models in this specification.</ins> <ins class="diff-new">User agents must handle text other than</ins> <a href="#inter-element"><ins class= "diff-new">inter-element whitespace</ins></a> <ins class= "diff-new">found in MathML elements whose content models do not allow raw text by pretending for the purposes of MathML content models, layout, and rendering that that text is actually wrapped in an</ins> <code title=""><ins class="diff-new">mtext</ins></code> <ins class="diff-new">element in the</ins> <a href= "#mathml0"><ins class="diff-new">MathML namespace</ins></a> .<ins class="diff-new">(Such text is not, however, conforming.)</ins> <ins class="diff-new">User agents must act as if any MathML element whose contents does not match the element's content model was replaced, for the purposes of MathML layout and rendering, by an</ins> <code title=""><ins class="diff-new">merror</ins></code> <ins class="diff-new">element in the</ins> <a href= "#mathml0"><ins class="diff-new">MathML namespace</ins></a> <ins class="diff-new">containing some appropriate error message.</ins> <ins class="diff-new">To enable authors to use MathML tools that only accept MathML in its XML form, interactive HTML user agents are encouraged to provide a way to export any MathML fragment as a namespace-well-formed XML fragment.</ins> <h4 id="svg"><ins class= "diff-new">3.12.16</ins> <ins class= "diff-new">SVG</ins></h4> <ins class="diff-new">The</ins> <code><ins class= "diff-new">svg</ins></code> <ins class="diff-new">element from the</ins> <a href="#svg-namespace"><ins class="diff-new">SVG namespace</ins></a> <ins class="diff-new">falls into the</ins> <a href="#embedded1"><ins class="diff-new">embedded content</ins></a> <ins class="diff-new">category for the purposes of the content models in this specification.</ins> <ins class="diff-new">To enable authors to use SVG tools that only accept SVG in its XML form, interactive HTML user agents are encouraged to provide a way to export any SVG fragment as a namespace-well-formed XML fragment.</ins> <h4 id="dimension"><del class= "diff-old">3.14.15.</del> <ins class= "diff-chg">3.12.17</ins> <dfn id="dimension0">Dimension attributes</dfn></h4> The <dfn id="width4" title= "attr-dim-width"><code>width</code></dfn> and <dfn id="height3" title="attr-dim-height"><code>height</code></dfn> attributes on <code><a href="#img">img</a></code> , <code><a href= "#embed">embed</a></code> , <code><a href= "#object">object</a></code> , and <code><a href= "#video1">video</a></code> elements may be specified to give the dimensions of the visual content of the element (the width and height respectively, relative to the nominal direction of the output medium), in CSS pixels. The attributes, if specified, must have values that are <a href="#valid3">valid positive non-zero integers</a> . The specified dimensions given may differ from the dimensions specified in the resource itself, since the resource may have a resolution that differs from the CSS pixel resolution. (On screens, CSS pixels have a resolution of 96ppi, but in general the CSS pixel resolution depends on the reading distance.) If both attributes are specified, then the ratio of the specified width to the specified height must be the same as the ratio of the logical width to the logical height in the resource. The two attributes must be omitted if the resource in question does not have both a logical width and a logical height. To parse the attributes, user agents must use the <a href= "#rules2">rules for parsing dimension values</a> . This will return either an integer length, a percentage value, or nothing. The user agent requirements for processing the values obtained from parsing these attributes are described <a href="#sizing" title= "sizing of embedded content">in the rendering section</a> . If one of these attributes, when parsing, returns no value, it must be treated, for the purposes of those requirements, as if it was not specified. The <dfn id="width5" title= "dom-dim-width"><code>width</code></dfn> and <dfn id="height4" title="dom-dim-height"><code>height</code></dfn> DOM attributes on the <code><a href="#embed">embed</a></code> , <code><a href= "#object">object</a></code> , and <code><a href= "#video1">video</a></code> elements must <a href= "#reflect">reflect</a> the content attributes of the same name. <h3 id="tabular"><del class= "diff-old">3.15.</del> <ins class="diff-chg">3.13</ins> Tabular data</h3> <h4 id="table-intro"><ins class= "diff-new">3.13.1</ins> <ins class= "diff-new">Introduction</ins></h4> <ins class="diff-new">This section is non-normative.</ins> ...examples,<ins class="diff-new">how to write tables accessibly, a brief mention of the table model, etc...</ins> <h4 id="the-table"><del class= "diff-old">3.15.1.</del> <ins class="diff-chg">3.13.2</ins> The <dfn id="table"><code>table</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd>In this order: optionally a <code><a href= "#caption0">caption</a></code> element, followed by either zero or more <code><a href="#colgroup">colgroup</a></code> elements, followed optionally by a <code><a href="#thead0">thead</a></code> element, followed optionally by a <code><a href= "#tfoot0">tfoot</a></code> element, followed by either zero or more <code><a href="#tbody">tbody</a></code> elements or one or more <code><a href="#tr">tr</a></code> elements, followed optionally by a <code><a href="#tfoot0">tfoot</a></code> element (but there can only be one <code><a href="#tfoot0">tfoot</a></code> element child in total).</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmltableelement">HTMLTableElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute HTMLTableCaptionElement <a href= "#caption" title="dom-table-caption">caption</a>; HTMLElement <a href="#createcaption" title= "dom-table-createCaption">createCaption</a>(); void <a href="#deletecaption" title= "dom-table-deleteCaption">deleteCaption</a>(); attribute <a href= "#htmltablesectionelement">HTMLTableSectionElement</a> <a href= "#thead" title="dom-table-tHead">tHead</a>; HTMLElement <a href="#createthead" title= "dom-table-createTHead">createTHead</a>(); void <a href="#deletethead" title= "dom-table-deleteTHead">deleteTHead</a>(); attribute <a href= "#htmltablesectionelement">HTMLTableSectionElement</a> <a href= "#tfoot" title="dom-table-tFoot">tFoot</a>; HTMLElement <a href="#createtfoot" title= "dom-table-createTFoot">createTFoot</a>(); void <a href="#deletetfoot" title= "dom-table-deleteTFoot">deleteTFoot</a>(); readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#tbodies" title= "dom-table-tBodies">tBodies</a>; <ins class="diff-new"> HTMLElement <a href="#createtbody" title= "dom-table-createTBody">createTBody</a>(); </ins> readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#rows" title= "dom-table-rows">rows</a>; HTMLElement <a href="#insertrow" title= "dom-table-insertRow">insertRow</a>(in long index); void <a href="#deleterow" title= "dom-table-deleteRow">deleteRow</a>(in long index); }; </pre></dd> </dl> The <code><a href="#table">table</a></code> element represents data with more than one dimension (a <a href="#table1" title= "concept-table">table</a> ). we need some editorial text on how layout tables are bad practice and non-conforming The children of a <code><a href="#table">table</a></code> element must be, in order: <ol> <li> Zero or one <code><a href="#caption0">caption</a></code> elements. </li> <li> Zero or more <code><a href="#colgroup">colgroup</a></code> elements. </li> <li> Zero or one <code><a href="#thead0">thead</a></code> elements. </li> <li> Zero or one <code><a href="#tfoot0">tfoot</a></code> elements, if the last element in the table is not a <code><a href= "#tfoot0">tfoot</a></code> element. </li> <li> Either: <ul> <li>Zero or more <code><a href="#tbody">tbody</a></code> elements, or</li> <li>One or more <code><a href="#tr">tr</a></code> elements. <ins class="diff-new">(Only expressible in the</ins> <ins class="diff-new">XML serialization</ins> .)</li> </ul> </li> <li> Zero or one <code><a href="#tfoot0">tfoot</a></code> element, if there are no other <code><a href="#tfoot0">tfoot</a></code> elements in the table. </li> </ol> The <code><a href="#table">table</a></code> element takes part in the <a href="#table0">table model</a> . The <dfn id="caption" title= "dom-table-caption"><code>caption</code></dfn> DOM attribute must return, on getting, the first <code><a href= "#caption0">caption</a></code> element child of the <code><a href= "#table">table</a></code> <del class="diff-old">element.</del> <ins class="diff-chg">element, if any, or null otherwise.</ins> On setting, if the new value is a <code><a href= "#caption0">caption</a></code> element, the first <code><a href= "#caption0">caption</a></code> element child of the <code><a href= "#table">table</a></code> element, if any, must be removed, and the new value must be inserted as the first node of the <code><a href= "#table">table</a></code> element. If the new value is not a <code><a href="#caption0">caption</a></code> element, then a <code>HIERARCHY_REQUEST_ERR</code> DOM exception must be raised instead. The <dfn id="createcaption" title= "dom-table-createCaption"><code>createCaption()</code></dfn> method must return the first <code><a href="#caption0">caption</a></code> element child of the <code><a href="#table">table</a></code> element, if any; otherwise a new <code><a href= "#caption0">caption</a></code> element must be created, inserted as the first node of the <code><a href="#table">table</a></code> element, and then returned. The <dfn id="deletecaption" title= "dom-table-deleteCaption"><code>deleteCaption()</code></dfn> method must remove the first <code><a href="#caption0">caption</a></code> element child of the <code><a href="#table">table</a></code> element, if any. The <dfn id="thead" title= "dom-table-tHead"><code>tHead</code></dfn> DOM attribute must return, on getting, the first <code><a href= "#thead0">thead</a></code> element child of the <code><a href= "#table">table</a></code> <del class="diff-old">element.</del> <ins class="diff-chg">element, if any, or null otherwise.</ins> On setting, if the new value is a <code><a href= "#thead0">thead</a></code> element, the first <code><a href= "#thead0">thead</a></code> element child of the <code><a href= "#table">table</a></code> element, if any, must be removed, and the new value must be inserted immediately before the first element in the <code><a href="#table">table</a></code> element that is neither a <code><a href="#caption0">caption</a></code> element nor a <code><a href="#colgroup">colgroup</a></code> element, if any, or at the end of the table otherwise. If the new value is not a <code><a href="#thead0">thead</a></code> element, then a <code>HIERARCHY_REQUEST_ERR</code> DOM exception must be raised instead. The <dfn id="createthead" title= "dom-table-createTHead"><code>createTHead()</code></dfn> method must return the first <code><a href="#thead0">thead</a></code> element child of the <code><a href="#table">table</a></code> element, if any; otherwise a new <code><a href= "#thead0">thead</a></code> element must be created and inserted immediately before the first element in the <code><a href= "#table">table</a></code> element that is neither a <code><a href= "#caption0">caption</a></code> element nor a <code><a href= "#colgroup">colgroup</a></code> element, if any, or at the end of the table otherwise, and then that new element must be returned. The <dfn id="deletethead" title= "dom-table-deleteTHead"><code>deleteTHead()</code></dfn> method must remove the first <code><a href="#thead0">thead</a></code> element child of the <code><a href="#table">table</a></code> element, if any. The <dfn id="tfoot" title= "dom-table-tFoot"><code>tFoot</code></dfn> DOM attribute must return, on getting, the first <code><a href= "#tfoot0">tfoot</a></code> element child of the <code><a href= "#table">table</a></code> <del class="diff-old">element.</del> <ins class="diff-chg">element, if any, or null otherwise.</ins> On setting, if the new value is a <code><a href= "#tfoot0">tfoot</a></code> element, the first <code><a href= "#tfoot0">tfoot</a></code> element child of the <code><a href= "#table">table</a></code> element, if any, must be removed, and the new value must be inserted immediately before the first element in the <code><a href="#table">table</a></code> element that is neither a <code><a href="#caption0">caption</a></code> element, a <code><a href="#colgroup">colgroup</a></code> element, nor a <code><a href="#thead0">thead</a></code> element, if any, or at the end of the table if there are no such elements. If the new value is not a <code><a href="#tfoot0">tfoot</a></code> element, then a <code>HIERARCHY_REQUEST_ERR</code> DOM exception must be raised instead. The <dfn id="createtfoot" title= "dom-table-createTFoot"><code>createTFoot()</code></dfn> method must return the first <code><a href="#tfoot0">tfoot</a></code> element child of the <code><a href="#table">table</a></code> element, if any; otherwise a new <code><a href= "#tfoot0">tfoot</a></code> element must be created and inserted immediately before the first element in the <code><a href= "#table">table</a></code> element that is neither a <code><a href= "#caption0">caption</a></code> element, a <code><a href= "#colgroup">colgroup</a></code> element, nor a <code><a href= "#thead0">thead</a></code> element, if any, or at the end of the table if there are no such elements, and then that new element must be returned. The <dfn id="deletetfoot" title= "dom-table-deleteTFoot"><code>deleteTFoot()</code></dfn> method must remove the first <code><a href="#tfoot0">tfoot</a></code> element child of the <code><a href="#table">table</a></code> element, if any. The <dfn id="tbodies" title= "dom-table-tBodies"><code>tBodies</code></dfn> attribute must return an <code><a href= "#htmlcollection0">HTMLCollection</a></code> rooted at the <code><a href="#table">table</a></code> node, whose filter matches only <code><a href="#tbody">tbody</a></code> elements that are children of the <code><a href="#table">table</a></code> element. The <dfn id="createtbody" title= "dom-table-createTBody"><code><ins class= "diff-new">createTBody()</ins></code></dfn> <ins class= "diff-new">method must create a new</ins> <code><a href= "#tbody"><ins class="diff-new">tbody</ins></a></code> <ins class= "diff-new">element, insert it immediately after the last</ins> <code><a href="#tbody"><ins class="diff-new">tbody</ins></a></code> <ins class="diff-new">element in the</ins> <code><a href= "#table"><ins class="diff-new">table</ins></a></code> <ins class= "diff-new">element, if any, or at the end of the</ins> <code><a href="#table"><ins class="diff-new">table</ins></a></code> <ins class="diff-new">element if the</ins> <code><a href= "#table"><ins class="diff-new">table</ins></a></code> <ins class= "diff-new">element has no</ins> <code><a href="#tbody"><ins class= "diff-new">tbody</ins></a></code> <ins class="diff-new">element children, and then must return the new</ins> <code><a href= "#tbody"><ins class="diff-new">tbody</ins></a></code> <ins class= "diff-new">element.</ins> <ins class="diff-new">The</ins> <dfn id="rows" title= "dom-table-rows"><code>rows</code></dfn> attribute must return an <code><a href="#htmlcollection0">HTMLCollection</a></code> rooted at the <code><a href="#table">table</a></code> node, whose filter matches only <code><a href="#tr">tr</a></code> elements that are either children of the <code><a href="#table">table</a></code> element, or children of <code><a href="#thead0">thead</a></code> , <code><a href="#tbody">tbody</a></code> , or <code><a href= "#tfoot0">tfoot</a></code> elements that are themselves children of the <code><a href="#table">table</a></code> element. The elements in the collection must be ordered such that those elements whose parent is a <code><a href="#thead0">thead</a></code> are included first, in tree order, followed by those elements whose parent is either a <code><a href="#table">table</a></code> or <code><a href= "#tbody">tbody</a></code> element, again in tree order, followed finally by those elements whose parent is a <code><a href= "#tfoot0">tfoot</a></code> element, still in tree order. The <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> of the <dfn id="insertrow" title= "dom-table-insertRow"><code>insertRow( <var title="">index</var> )</code></dfn> method depends on the state of the table. When it is called, the method must act as required by the first item in the following list of conditions that describes the state of the table and the <var title="">index</var> argument: <dl class="switch"> <dt>If <var title="">index</var> is less than <del class= "diff-old">-1</del> <ins class="diff-chg">−1</ins> or greater than the number of elements in <code title="dom-table-rows"><a href= "#rows">rows</a></code> collection:</dt> <dd>The method must raise an <code>INDEX_SIZE_ERR</code> exception.</dd> <dt>If the <code title="dom-table-rows"><a href= "#rows">rows</a></code> collection has zero elements in it, and the <code><a href="#table">table</a></code> has no <code><a href= "#tbody">tbody</a></code> elements in it:</dt> <dd>The method must create a <code><a href= "#tbody">tbody</a></code> element, then create a <code><a href= "#tr">tr</a></code> element, then append the <code><a href= "#tr">tr</a></code> element to the <code><a href= "#tbody">tbody</a></code> element, then append the <code><a href= "#tbody">tbody</a></code> element to the <code><a href= "#table">table</a></code> element, and finally return the <code><a href="#tr">tr</a></code> element.</dd> <dt>If the <code title="dom-table-rows"><a href= "#rows">rows</a></code> collection has zero elements in it:</dt> <dd>The method must create a <code><a href="#tr">tr</a></code> element, append it to the last <code><a href= "#tbody">tbody</a></code> element in the table, and return the <code><a href="#tr">tr</a></code> element.</dd> <dt>If <var title="">index</var> is equal to <del class= "diff-old">-1</del> <ins class="diff-chg">−1</ins> or equal to the number of items in <code title="dom-table-rows"><a href= "#rows">rows</a></code> collection:</dt> <dd>The method must create a <code><a href="#tr">tr</a></code> element, and append it to the parent of the last <code><a href= "#tr">tr</a></code> element in the <code title= "dom-table-rows"><a href="#rows">rows</a></code> collection. Then, the newly created <code><a href="#tr">tr</a></code> element must be returned.</dd> <dt>Otherwise:</dt> <dd>The method must create a <code><a href="#tr">tr</a></code> element, insert it immediately before the <var title="">index</var> th <code><a href="#tr">tr</a></code> element in the <code title= "dom-table-rows"><a href="#rows">rows</a></code> collection, in the same parent, and finally must return the newly created <code><a href="#tr">tr</a></code> element.</dd> </dl> <del class="diff-old">The</del> <ins class="diff-chg">When the</ins> <dfn id="deleterow" title= "dom-table-deleteRow"><code>deleteRow( <var title="">index</var> )</code></dfn> method <ins class="diff-new">is called, the user agent</ins> must <del class="diff-old">remove</del> <ins class= "diff-chg">run</ins> the <ins class="diff-new">following steps:</ins> <ol> <li> <ins class="diff-new">If</ins> <var title="">index</var> <del class="diff-old">th element</del> <ins class="diff-chg">is equal to −1, then</ins> <var title=""><ins class= "diff-chg">index</ins></var> <ins class="diff-chg">must be set to the number if items</ins> in the <code title= "dom-table-rows"><a href="#rows">rows</a></code> <del class= "diff-old">collection from its parent. If</del> <ins class= "diff-chg">collection, minus one.</ins> </li> <li> <ins class="diff-chg">Now, if</ins> <var title="">index</var> is less than <del class="diff-old">zero</del> <ins class= "diff-chg">zero,</ins> or greater than or equal to the number of elements in the <code title="dom-table-rows"><a href= "#rows">rows</a></code> collection, the method must instead raise an <code>INDEX_SIZE_ERR</code> <del class= "diff-old">exception.</del> <ins class="diff-chg">exception, and these steps must be aborted.</ins> </li> <li> <ins class="diff-chg">Otherwise, the method must remove the</ins> <var title=""><ins class="diff-chg">index</ins></var> <ins class="diff-chg">th element in the</ins> <code title= "dom-table-rows"><a href="#rows"><ins class= "diff-chg">rows</ins></a></code> <ins class="diff-chg">collection from its parent.</ins> </li> </ol> <h4 id="the-caption"><del class= "diff-old">3.15.2.</del> <ins class="diff-chg">3.13.3</ins> The <dfn id="caption0"><code>caption</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As the first element child of a <code><a href= "#table">table</a></code> element.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#caption0">caption</a></code> element represents the title of the <code><a href="#table">table</a></code> that is its parent, if it has a parent and that is a <code><a href= "#table">table</a></code> element. The <code><a href="#caption0">caption</a></code> element takes part in the <a href="#table0">table model</a> . <h4 id="the-colgroup"><del class= "diff-old">3.15.3.</del> <ins class="diff-chg">3.13.4</ins> The <dfn id="colgroup"><code>colgroup</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As a child of a <code><a href="#table">table</a></code> element, after any <code><a href="#caption0">caption</a></code> elements and before any <code><a href="#thead0">thead</a></code> , <code><a href="#tbody">tbody</a></code> , <code><a href= "#tfoot0">tfoot</a></code> , and <code><a href="#tr">tr</a></code> elements.</dd> <dt>Content model:</dt> <dd>Zero or more <code><a href="#col">col</a></code> elements.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-colgroup-span"><a href= "#span0">span</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmltablecolelement">HTMLTableColElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute unsigned long <a href="#span1" title= "dom-colgroup-span">span</a>; }; </pre></dd> </dl> The <code><a href="#colgroup">colgroup</a></code> element represents a <a href="#column0" title= "concept-column-group">group</a> of one or more <a href="#column" title="concept-column">columns</a> in the <code><a href= "#table">table</a></code> that is its parent, if it has a parent and that is a <code><a href="#table">table</a></code> element. If the <code><a href="#colgroup">colgroup</a></code> element contains no <code><a href="#col">col</a></code> elements, then the element may have a <dfn id="span0" title= "attr-colgroup-span"><code>span</code></dfn> content attribute specified, whose value must be a <a href="#valid">valid non-negative integer</a> greater than zero. <del class= "diff-old">Its default value, which must be used if parsing the attribute as a non-negative integer returns either an error or zero, is 1.</del> The <code><a href="#colgroup">colgroup</a></code> element and its <code title="attr-colgroup-span"><a href= "#span0">span</a></code> attribute take part in the <a href= "#table0">table model</a> . The <dfn id="span1" title= "dom-colgroup-span"><code>span</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the content attribute of the same <del class="diff-old">name, with the exception that on setting, if the new</del> <ins class="diff-chg">name. The</ins> value <del class="diff-old">is 0, then an INDEX_SIZE_ERR exception</del> must be <del class="diff-old">raised.</del> <a href= "#limited1"><ins class="diff-chg">limited to only positive non-zero numbers</ins></a> . <h4 id="the-col"><del class= "diff-old">3.15.4.</del> <ins class="diff-chg">3.13.5</ins> The <dfn id="col"><code>col</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As a child of a <code><a href="#colgroup">colgroup</a></code> element that doesn't have a <code title="attr-col-span"><a href= "#span2">span</a></code> attribute.</dd> <dt>Content model:</dt> <dd>Empty.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-col-span"><a href= "#span2">span</a></code></dd> <dt>DOM interface:</dt> <dd> <code><a href= "#htmltablecolelement">HTMLTableColElement</a></code> , same as for <code><a href="#colgroup">colgroup</a></code> elements. This interface defines one member, <code title="dom-col-span"><a href= "#span3">span</a></code> . </dd> </dl> If a <code><a href="#col">col</a></code> element has a parent and that is a <code><a href="#colgroup">colgroup</a></code> element that itself has a parent that is a <code><a href= "#table">table</a></code> element, then the <code><a href= "#col">col</a></code> element represents one or more <a href= "#column" title="concept-column">columns</a> in the <a href= "#column0" title="concept-column-group">column group</a> represented by that <code><a href="#colgroup">colgroup</a></code> . The element may have a <dfn id="span2" title= "attr-col-span"><code>span</code></dfn> content attribute specified, whose value must be a <a href="#valid">valid non-negative integer</a> greater than zero. <del class= "diff-old">Its default value, which must be used if parsing the attribute as a non-negative integer returns either an error or zero, is 1.</del> The <code><a href="#col">col</a></code> element and its <code title="attr-col-span"><a href="#span2">span</a></code> attribute take part in the <a href="#table0">table model</a> . The <dfn id="span3" title="dom-col-span"><code>span</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the content attribute of the same <del class="diff-old">name, with the exception that on setting, if the new</del> <ins class= "diff-chg">name. The</ins> value <del class="diff-old">is 0, then an INDEX_SIZE_ERR exception</del> must be <del class= "diff-old">raised.</del> <a href="#limited1"><ins class= "diff-chg">limited to only positive non-zero numbers</ins></a> . <h4 id="the-tbody"><del class= "diff-old">3.15.5.</del> <ins class="diff-chg">3.13.6</ins> The <dfn id="tbody"><code>tbody</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As a child of a <code><a href="#table">table</a></code> element, after any <code><a href="#caption0">caption</a></code> , <code><a href="#colgroup">colgroup</a></code> , and <code><a href= "#thead0">thead</a></code> elements, but only if there are no <code><a href="#tr">tr</a></code> elements that are children of the <code><a href="#table">table</a></code> element.</dd> <dt>Content model:</dt> <dd><del class="diff-old">One</del> <ins class= "diff-chg">Zero</ins> or more <code><a href="#tr">tr</a></code> elements</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmltablesectionelement">HTMLTableSectionElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#rows0" title= "dom-tbody-rows">rows</a>; <a href="#htmlelement">HTMLElement</a> <a href="#insertrow0" title="dom-tbody-insertRow">insertRow</a>(in long index); void <a href="#deleterow0" title= "dom-tbody-deleteRow">deleteRow</a>(in long index); }; </pre> The <code><a href= "#htmltablesectionelement">HTMLTableSectionElement</a></code> interface is also used for <code><a href="#thead0">thead</a></code> and <code><a href="#tfoot0">tfoot</a></code> elements. </dd> </dl> The <code><a href="#tbody">tbody</a></code> element represents a <a href="#row-group" title="concept-row-group">block</a> of <a href="#row0" title="concept-row">rows</a> that consist of a body of data for the parent <code><a href="#table">table</a></code> element, if the <code><a href="#tbody">tbody</a></code> element has a parent and it is a <code><a href="#table">table</a></code> . The <code><a href="#tbody">tbody</a></code> element takes part in the <a href="#table0">table model</a> . The <dfn id="rows0" title= "dom-tbody-rows"><code>rows</code></dfn> attribute must return an <code><a href="#htmlcollection0">HTMLCollection</a></code> rooted at the element, whose filter matches only <code><a href= "#tr">tr</a></code> elements that are children of the element. The <dfn id="insertrow0" title= "dom-tbody-insertRow"><code>insertRow( <var title="">index</var> )</code></dfn> method must, when invoked on an element <var title= "">table section</var> , act as follows: If <var title="">index</var> is less than <del class= "diff-old">-1</del> <ins class="diff-chg">−1</ins> or greater than the number of elements in the <code title="dom-tbody-rows"><a href= "#rows0">rows</a></code> collection, the method must raise an <code>INDEX_SIZE_ERR</code> exception. If <var title="">index</var> is equal to <del class= "diff-old">-1</del> <ins class="diff-chg">−1</ins> or equal to the number of items in the <code title="dom-tbody-rows"><a href= "#rows0">rows</a></code> collection, the method must create a <code><a href="#tr">tr</a></code> element, append it to the element <var title="">table section</var> , and return the newly created <code><a href="#tr">tr</a></code> element. Otherwise, the method must create a <code><a href= "#tr">tr</a></code> element, insert it as a child of the <var title="">table section</var> element, immediately before the <var title="">index</var> th <code><a href="#tr">tr</a></code> element in the <code title="dom-tbody-rows"><a href= "#rows0">rows</a></code> collection, and finally must return the newly created <code><a href="#tr">tr</a></code> element. The <dfn id="deleterow0" title= "dom-tbody-deleteRow"><code>deleteRow( <var title="">index</var> )</code></dfn> method must remove the <var title="">index</var> th element in the <code title="dom-tbody-rows"><a href= "#rows0">rows</a></code> collection from its parent. If <var title= "">index</var> is less than zero or greater than or equal to the number of elements in the <code title="dom-tbody-rows"><a href= "#rows0">rows</a></code> collection, the method must instead raise an <code>INDEX_SIZE_ERR</code> exception. <h4 id="the-thead"><del class= "diff-old">3.15.6.</del> <ins class="diff-chg">3.13.7</ins> The <dfn id="thead0"><code>thead</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As a child of a <code><a href="#table">table</a></code> element, after any <code><a href="#caption0">caption</a></code> , and <code><a href="#colgroup">colgroup</a></code> elements and before any <code><a href="#tbody">tbody</a></code> , <code><a href= "#tfoot0">tfoot</a></code> , and <code><a href="#tr">tr</a></code> elements, but only if there are no other <code><a href= "#thead0">thead</a></code> elements that are children of the <code><a href="#table">table</a></code> element.</dd> <dt>Content model:</dt> <dd><del class="diff-old">One</del> <ins class= "diff-chg">Zero</ins> or more <code><a href="#tr">tr</a></code> elements</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><code><a href= "#htmltablesectionelement">HTMLTableSectionElement</a></code> , as defined for <code><a href="#tbody">tbody</a></code> elements.</dd> </dl> The <code><a href="#thead0">thead</a></code> element represents the <a href="#row-group" title="concept-row-group">block</a> of <a href="#row0" title="concept-row">rows</a> that consist of the column labels (headers) for the parent <code><a href= "#table">table</a></code> element, if the <code><a href= "#thead0">thead</a></code> element has a parent and it is a <code><a href="#table">table</a></code> . The <code><a href="#thead0">thead</a></code> element takes part in the <a href="#table0">table model</a> . <h4 id="the-tfoot"><del class= "diff-old">3.15.7.</del> <ins class="diff-chg">3.13.8</ins> The <dfn id="tfoot0"><code>tfoot</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As a child of a <code><a href="#table">table</a></code> element, after any <code><a href="#caption0">caption</a></code> , <code><a href="#colgroup">colgroup</a></code> , and <code><a href= "#thead0">thead</a></code> elements and before any <code><a href= "#tbody">tbody</a></code> and <code><a href="#tr">tr</a></code> elements, but only if there are no other <code><a href= "#tfoot0">tfoot</a></code> elements that are children of the <code><a href="#table">table</a></code> element.</dd> <dd>As a child of a <code><a href="#table">table</a></code> element, after any <code><a href="#caption0">caption</a></code> , <code><a href="#colgroup">colgroup</a></code> , <code><a href= "#thead0">thead</a></code> , <code><a href= "#tbody">tbody</a></code> , and <code><a href="#tr">tr</a></code> elements, but only if there are no other <code><a href= "#tfoot0">tfoot</a></code> elements that are children of the <code><a href="#table">table</a></code> element.</dd> <dt>Content model:</dt> <dd><del class="diff-old">One</del> <ins class= "diff-chg">Zero</ins> or more <code><a href="#tr">tr</a></code> elements</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><code><a href= "#htmltablesectionelement">HTMLTableSectionElement</a></code> , as defined for <code><a href="#tbody">tbody</a></code> elements.</dd> </dl> The <code><a href="#tfoot0">tfoot</a></code> element represents the <a href="#row-group" title="concept-row-group">block</a> of <a href="#row0" title="concept-row">rows</a> that consist of the column summaries (footers) for the parent <code><a href= "#table">table</a></code> element, if the <code><a href= "#tfoot0">tfoot</a></code> element has a parent and it is a <code><a href="#table">table</a></code> . The <code><a href="#tfoot0">tfoot</a></code> element takes part in the <a href="#table0">table model</a> . <h4 id="the-tr"><del class= "diff-old">3.15.8.</del> <ins class="diff-chg">3.13.9</ins> The <dfn id="tr"><code>tr</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As a child of a <code><a href="#thead0">thead</a></code> element.</dd> <dd>As a child of a <code><a href="#tbody">tbody</a></code> element.</dd> <dd>As a child of a <code><a href="#tfoot0">tfoot</a></code> element.</dd> <dd>As a child of a <code><a href="#table">table</a></code> element, after any <code><a href="#caption0">caption</a></code> , <code><a href="#colgroup">colgroup</a></code> , and <code><a href= "#thead0">thead</a></code> elements, but only if there are no <code><a href="#tbody">tbody</a></code> elements that are children of the <code><a href="#table">table</a></code> element.</dd> <dt>Content model:</dt> <dd><del class="diff-old">One</del> <ins class= "diff-chg">Zero</ins> or more <code><a href="#td">td</a></code> or <code><a href="#th">th</a></code> elements</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmltablerowelement">HTMLTableRowElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { readonly attribute long <a href="#rowindex" title= "dom-tr-rowIndex">rowIndex</a>; readonly attribute long <a href="#sectionrowindex" title= "dom-tr-sectionRowIndex">sectionRowIndex</a>; readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#cells" title= "dom-tr-cells">cells</a>; <a href="#htmlelement">HTMLElement</a> <a href="#insertcell" title="dom-tr-insertCell">insertCell</a>(in long index); void deleteCell(in long index); }; </pre></dd> </dl> The <code><a href="#tr">tr</a></code> element represents a <a href="#row0" title="concept-row">row</a> of <a href="#cell" title="concept-cell">cells</a> in a <a href="#table1" title= "concept-table">table</a> . The <code><a href="#tr">tr</a></code> element takes part in the <a href="#table0">table model</a> . The <dfn id="rowindex" title= "dom-tr-rowIndex"><code>rowIndex</code></dfn> <del class= "diff-old">element</del> <ins class="diff-chg">attribute</ins> must, if the element has a parent <code><a href= "#table">table</a></code> element, or a parent <code><a href= "#tbody">tbody</a></code> , <code><a href= "#thead0">thead</a></code> , or <code><a href= "#tfoot0">tfoot</a></code> element and a grandparent <code><a href="#table">table</a></code> element, return the index of the <code><a href="#tr">tr</a></code> element in that <code><a href="#table">table</a></code> element's <code title= "dom-table-rows"><a href="#rows">rows</a></code> collection. If there is no such <code><a href="#table">table</a></code> element, then the attribute must return <del class="diff-old">0.</del> <ins class="diff-chg">−1.</ins> The <dfn id="sectionrowindex" title= "dom-tr-sectionRowIndex"><code>sectionRowIndex</code></dfn> <del class="diff-old">DOM</del> attribute must, if the element has a parent <code><a href="#table">table</a></code> , <code><a href= "#tbody">tbody</a></code> , <code><a href= "#thead0">thead</a></code> , or <code><a href= "#tfoot0">tfoot</a></code> element, return the index of the <code><a href="#tr">tr</a></code> element in the parent element's <code title="">rows</code> collection (for tables, that's the <code title="dom-table-rows"><a href="#rows">rows</a></code> collection; for table sections, that's the <code title= "dom-tbody-rows"><a href="#rows0">rows</a></code> collection). If there is no such parent element, then the attribute must return <del class="diff-old">0.</del> <ins class="diff-chg">−1.</ins> The <dfn id="cells" title= "dom-tr-cells"><code>cells</code></dfn> attribute must return an <code><a href="#htmlcollection0">HTMLCollection</a></code> rooted at the <code><a href="#tr">tr</a></code> element, whose filter matches only <code><a href="#td">td</a></code> and <code><a href= "#th">th</a></code> elements that are children of the <code><a href="#tr">tr</a></code> element. The <dfn id="insertcell" title= "dom-tr-insertCell"><code>insertCell( <var title="">index</var> )</code></dfn> method must act as follows: If <var title="">index</var> is less than <del class= "diff-old">-1</del> <ins class="diff-chg">−1</ins> or greater than the number of elements in the <code title="dom-tr-cells"><a href= "#cells">cells</a></code> collection, the method must raise an <code>INDEX_SIZE_ERR</code> exception. If <var title="">index</var> is equal to <del class= "diff-old">-1</del> <ins class="diff-chg">−1</ins> or equal to the number of items in <code title="dom-tr-cells"><a href= "#cells">cells</a></code> collection, the method must create a <code><a href="#td">td</a></code> element, append it to the <code><a href="#tr">tr</a></code> element, and return the newly created <code><a href="#td">td</a></code> element. Otherwise, the method must create a <code><a href= "#td">td</a></code> element, insert it as a child of the <code><a href="#tr">tr</a></code> element, immediately before the <var title="">index</var> th <code><a href="#td">td</a></code> or <code><a href="#th">th</a></code> element in the <code title= "dom-tr-cells"><a href="#cells">cells</a></code> collection, and finally must return the newly created <code><a href= "#td">td</a></code> element. The <dfn id="deletecell" title= "dom-tr-deleteCell"><code>deleteCell( <var title="">index</var> )</code></dfn> method must remove the <var title="">index</var> th element in the <code title="dom-tr-cells"><a href= "#cells">cells</a></code> collection from its parent. If <var title="">index</var> is less than zero or greater than or equal to the number of elements in the <code title= "dom-tr-cells"><a href="#cells">cells</a></code> collection, the method must instead raise an <code>INDEX_SIZE_ERR</code> exception. <h4 id="the-td"><del class= "diff-old">3.15.9.</del> <ins class="diff-chg">3.13.10</ins> The <dfn id="td"><code>td</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">None.</del> <a href= "#sectioning1"><ins class="diff-chg">Sectioning root</ins></a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>As a child of a <code><a href="#tr">tr</a></code> element.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-tdth-colspan"><a href= "#colspan">colspan</a></code></dd> <dd><code title="attr-tdth-rowspan"><a href= "#rowspan">rowspan</a></code></dd> <dd><code title="attr-td-headers"><a href="#headers"><ins class= "diff-new">headers</ins></a></code></dd> <dt>DOM interface:</dt> <dd> <pre> <del class="diff-old"> class=idl>interface { attribute long ; attribute long ; readonly attribute long ; </del> <ins class="diff-chg"> class=idl>interface <dfn id= "htmltabledatacellelement">HTMLTableDataCellElement</dfn> : <a href="#htmltablecellelement">HTMLTableCellElement</a> { attribute DOMString <a href="#headers0" title= "dom-td-headers">headers</a>; </ins> }; </pre></dd> </dl> The <code><a href="#td">td</a></code> element represents a data <a href="#cell" title="concept-cell">cell</a> in a table. The <code><a href="#td">td</a></code> element may have a <dfn id="headers" title="attr-td-headers"><code><del class= "diff-old">colspan</del> <ins class= "diff-chg">headers</ins></code></dfn> content attribute <ins class= "diff-new">specified. The</ins> <code title= "attr-td-headers"><a href="#headers"><ins class= "diff-new">headers</ins></a></code> <ins class= "diff-new">attribute, if</ins> specified, <del class= "diff-old">whose value</del> must <del class="diff-old">be</del> <ins class="diff-chg">contain</ins> a <del class="diff-old">valid non-negative integer greater than zero. Its default value,</del> <ins class="diff-chg">string consisting of an</ins> <a href= "#unordered"><ins class="diff-chg">unordered set of unique space-separated tokens</ins></a> ,<ins class="diff-chg">each of</ins> which must <del class="diff-old">be used if parsing</del> <ins class="diff-chg">have</ins> the <del class= "diff-old">attribute as</del> <ins class="diff-chg">value of an ID of</ins> a <del class="diff-old">non-negative integer</del> <code><a href="#th"><ins class="diff-chg">th</ins></a> <del class= "diff-old">returns either an error or zero, is 1. The</del></code> <ins class="diff-chg">element taking part in the same</ins> <a href="#table1" title="concept-table"><ins class= "diff-chg">table</ins></a> <ins class="diff-chg">as the</ins> <code><a href="#td">td</a></code> element <del class="diff-old">may also have a rowspan content</del> <ins class="diff-chg">(as defined by the</ins> <a href="#table0"><ins class="diff-chg">table model</ins></a> <ins class="diff-chg">).</ins> <ins class="diff-chg">The exact effect of the</ins> attribute <del class="diff-old">specified, whose value must be a valid non-negative integer . Its default value,</del> <ins class= "diff-chg">is described in detail in the</ins> <a href= "#algorithm3"><ins class="diff-chg">algorithm for assigning header cells to data cells</ins></a> , which <ins class="diff-new">user agents</ins> must <del class="diff-old">be used if parsing</del> <ins class="diff-chg">apply to determine</ins> the <del class= "diff-old">attribute as a non-negative integer returns an error, is also 1.</del> <ins class="diff-chg">relationships between data cells and header cells.</ins> The <code><a href="#td">td</a></code> element and its <code title="attr-tdth-colspan"><a href= "#colspan">colspan</a></code> and <code title= "attr-tdth-rowspan"><a href="#rowspan">rowspan</a></code> attributes take part in the <a href="#table0">table model</a> . The <del class="diff-old">colspan DOM attribute must reflect the content attribute of the same name, with the exception that on setting, if the new value is 0, then an INDEX_SIZE_ERR exception must be raised. The</del> <dfn id="headers0" title= "dom-td-headers"><code><del class="diff-old">rowspan</del> <ins class="diff-chg">headers</ins></code></dfn> DOM attribute must <a href="#reflect">reflect</a> the content attribute of the same name. <del class="diff-old">The cellIndex DOM attribute must, if the element has a parent tr element, return the index of the cell's element in the parent element's cells collection. If there is no such parent element, then the attribute must return 0. There has been some suggestion that the headers attribute from HTML4, or some other mechanism that is more powerful than scope="" , should be included. This has not yet been considered.</del> <h4 id="the-th"><del class= "diff-old">3.15.10.</del> <ins class= "diff-chg">3.13.11</ins> The <dfn id= "th"><code>th</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As a child of a <code><a href="#tr">tr</a></code> element.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-tdth-colspan"><a href= "#colspan">colspan</a></code></dd> <dd><code title="attr-tdth-rowspan"><a href= "#rowspan">rowspan</a></code></dd> <dd><code title="attr-th-scope"><a href= "#scope0">scope</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmltableheadercellelement">HTMLTableHeaderCellElement</dfn> : <a href="#htmltablecellelement">HTMLTableCellElement</a> { attribute DOMString <a href="#scope1" title= "dom-th-scope">scope</a>; }; </pre></dd> </dl> The <code><a href="#th">th</a></code> element represents a header <a href="#cell" title="concept-cell">cell</a> in a table. The <code><a href="#th">th</a></code> element may have a <del class="diff-old">colspan content attribute specified, whose value must be a valid non-negative integer greater than zero. Its default value, which must be used if parsing the attribute as a non-negative integer returns either an error or zero, is 1. The th element may also have a rowspan content attribute specified, whose value must be a valid non-negative integer . Its default value, which must be used if parsing the attribute as a non-negative integer returns an error, is also 1. The th element may have a</del> <dfn id="scope0" title= "attr-th-scope"><code>scope</code></dfn> content attribute specified. The <code title="attr-th-scope"><a href= "#scope0">scope</a></code> attribute is an <a href= "#enumerated">enumerated attribute</a> with five states, four of which have explicit keywords: <dl> <dt>The <dfn id="row" title= "attr-th-scope-row"><code>row</code></dfn> keyword, which maps to the row state</dt> <dd>The row state means the header cell applies to all the remaining cells in the row.</dd> <dt>The <dfn id="col0" title= "attr-th-scope-col"><code>col</code></dfn> keyword, which maps to the column state</dt> <dd>The column state means the header cell applies to all the remaining cells in the column.</dd> <dt>The <dfn id="rowgroup" title= "attr-th-scope-rowgroup"><code>rowgroup</code></dfn> keyword, which maps to the row group state</dt> <dd>The row group state means the header cell applies to all the remaining cells in the row group.</dd> <dt>The <dfn id="colgroup0" title= "attr-th-scope-colgroup"><code>colgroup</code></dfn> keyword, which maps to the column group state</dt> <dd>The column group state means the header cell applies to all the remaining cells in the column group.</dd> <dt>The auto state</dt> <dd>The auto state makes the header cell apply to a set of cells selected based on context.</dd> </dl> The <code title="attr-th-scope"><a href= "#scope0">scope</a></code> attribute's missing value default is the auto state. The exact effect of these values is described in detail in the <a href="#algorithm3">algorithm for assigning header cells to data cells</a> , which user agents must apply to determine the relationships between data cells and header cells. The <code><a href="#th">th</a></code> element and its <code title="attr-tdth-colspan"><a href="#colspan">colspan</a> <del class="diff-old">, rowspan ,</del></code> and <code title= "attr-tdth-rowspan"><del class="diff-old">scope</del> <a href= "#rowspan"><ins class="diff-chg">rowspan</ins></a></code> attributes take part in the <a href="#table0">table model</a> . The <dfn id="scope1" title= "dom-th-scope"><code>scope</code></dfn> DOM attribute must <a href= "#reflect">reflect</a> the content attribute of the same name. <h4 id="attributes0"><ins class= "diff-new">3.13.12</ins> <ins class="diff-new">Attributes common to</ins> <code><a href="#td"><ins class= "diff-new">td</ins></a></code> <ins class="diff-new">and</ins> <code><a href="#th"><ins class="diff-new">th</ins></a></code> <ins class="diff-new">elements</ins></h4> The <code><del class="diff-old">HTMLTableHeaderCellElement</del> <a href="#td"><ins class="diff-chg">td</ins></a></code> <del class= "diff-old">interface inherits</del> <ins class="diff-chg">and</ins> <code><a href="#th"><ins class="diff-chg">th</ins></a></code> <ins class="diff-chg">elements may have a</ins> <dfn id="colspan" title="attr-tdth-colspan"><code><ins class= "diff-chg">colspan</ins></code></dfn> <ins class="diff-chg">content attribute specified, whose value must be a</ins> <a href= "#valid"><ins class="diff-chg">valid non-negative integer</ins></a> <ins class="diff-chg">greater than zero.</ins> <ins class="diff-chg">The</ins> <code><a href="#td"><ins class= "diff-chg">td</ins></a></code> <ins class="diff-chg">and</ins> <code><a href="#th"><ins class="diff-chg">th</ins></a></code> <ins class="diff-chg">elements may also have a</ins> <dfn id= "rowspan" title="attr-tdth-rowspan"><code><ins class= "diff-chg">rowspan</ins></code></dfn> <ins class="diff-chg">content attribute specified, whose value must be a</ins> <a href= "#valid"><ins class="diff-chg">valid non-negative integer</ins></a> . <ins class="diff-chg">The</ins> <code><a href="#td"><ins class= "diff-chg">td</ins></a></code> <ins class="diff-chg">and</ins> <code><a href="#th"><ins class="diff-chg">th</ins></a></code> <ins class="diff-chg">elements implement interfaces that inherit</ins> from the <code><a href= "#htmltablecellelement">HTMLTableCellElement</a></code> <del class= "diff-old">interface and therefore</del> <ins class= "diff-chg">interface:</ins> <pre ins="" class="diff-chg"> class=idl>interface <dfn id= "htmltablecellelement">HTMLTableCellElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute long <a href="#colspan0" title= "dom-tdth-colSpan">colSpan</a>; attribute long <a href="#rowspan0" title= "dom-tdth-rowSpan">rowSpan</a>; readonly attribute long <a href="#cellindex" title= "dom-tdth-cellIndex">cellIndex</a>; }; </pre> <ins class="diff-chg">The</ins> <dfn id="colspan0" title= "dom-tdth-colSpan"><code><ins class= "diff-chg">colSpan</ins></code></dfn> <ins class="diff-chg">DOM attribute must</ins> <a href="#reflect"><ins class= "diff-chg">reflect</ins></a> <ins class="diff-chg">the content attribute of the same name. The value must be</ins> <a href= "#limited1"><ins class="diff-chg">limited to only positive non-zero numbers</ins></a> . <ins class="diff-chg">The</ins> <dfn id="rowspan0" title= "dom-tdth-rowSpan"><code><ins class= "diff-chg">rowSpan</ins></code></dfn> <ins class="diff-chg">DOM attribute must</ins> <a href="#reflect"><ins class= "diff-chg">reflect</ins></a> <ins class="diff-chg">the content attribute of the same name. Its default value, which must be used if</ins> <a href="#rules" title= "rules for parsing non-negative integers"><ins class= "diff-chg">parsing the attribute as a non-negative integer</ins></a> <ins class="diff-chg">returns an error, is</ins> also <ins class="diff-new">1.</ins> <ins class="diff-new">The</ins> <dfn id="cellindex" title= "dom-tdth-cellIndex"><code><ins class= "diff-new">cellIndex</ins></code></dfn> <ins class="diff-new">DOM attribute must, if the element</ins> has <ins class="diff-new">a parent</ins> <code><a href="#tr"><ins class= "diff-new">tr</ins></a></code> <ins class="diff-new">element, return</ins> the <del class="diff-old">DOM attributes defined above</del> <ins class="diff-chg">index of the cell's element</ins> in the <ins class="diff-chg">parent element's</ins> <code title= "dom-tr-cells"><del class="diff-old">td</del> <a href= "#cells"><ins class="diff-chg">cells</ins></a></code> <del class= "diff-old">section.</del> <ins class="diff-chg">collection. If there is no such parent element, then the attribute must return 0.</ins> <h4 id="processing"><del class= "diff-old">3.15.11.</del> <ins class= "diff-chg">3.13.13</ins> Processing model</h4> The various table elements and their content attributes together define the <dfn id="table0">table model</dfn> . A <dfn id="table1" title="concept-table">table</dfn> consists of cells aligned on a two-dimensional grid of <dfn id="slots" title= "concept-slots">slots</dfn> with coordinates ( <var title= "">x</var> , <var title="">y</var> ). The grid is finite, and is either empty or has one or more slots. If the grid has one or more slots, then the <var title="">x</var> coordinates are always in the range <del class="diff-old">1 ≤ </del> <ins class= "diff-chg">0 ≤ </ins> <var title="">x</var> <del class= "diff-old"> ≤ </del> <ins class= "diff-chg"> < </ins> <var title="">x <del class="diff-old">max</del> <ins class= "diff-chg">width</ins></var> , and the <var title= "">y</var> coordinates are always in the range <del class= "diff-old">1 ≤ </del> <ins class= "diff-chg">0 ≤ </ins> <var title="">y</var> <del class= "diff-old"> ≤ </del> <ins class= "diff-chg"> < </ins> <var title="">y <del class="diff-old">max</del> <ins class= "diff-chg">height</ins></var> . If one or both of <var title="">x <del class="diff-old">max</del> <ins class="diff-chg">width</ins></var> and <var title="">y <del class="diff-old">max</del> <ins class= "diff-chg">height</ins></var> are zero, then the table is empty (has no slots). Tables correspond to <code><a href= "#table">table</a></code> elements. A <dfn id="cell" title="concept-cell">cell</dfn> is a set of slots anchored at a slot ( <var title="">cell x</var> , <var title="">cell y</var> ), and with a particular <var title="">width</var> and <var title= "">height</var> such that the cell covers all the slots with coordinates ( <var title="">x</var> , <var title="">y</var> ) where <var title="">cell x</var>  ≤  <var title="">x</var>  <  <var title="">cell x</var> + <var title="">width</var> and <var title="">cell y</var>  ≤  <var title="">y</var>  <  <var title="">cell y</var> + <var title="">height</var> . <del class="diff-old">Cell</del> <ins class="diff-chg">Cells</ins> can either be data cells or header cells . Data cells correspond to <code><a href="#td">td</a></code> elements, and have zero or more associated header cells. Header cells correspond to <code><a href="#th">th</a></code> elements. A <dfn id="row0" title="concept-row">row</dfn> is a complete set of slots from <var title="">x</var> <del class= "diff-old">=1</del> <ins class="diff-chg">=0</ins> to <var title="">x</var> = <var title="">x <del class="diff-old">max</del> <ins class= "diff-chg">width</ins></var> <ins class= "diff-chg">-1</ins> , for a particular value of <var title= "">y</var> . Rows correspond to <code><a href="#tr">tr</a></code> elements. A <dfn id="column" title="concept-column">column</dfn> is a complete set of slots from <var title="">y</var> <del class= "diff-old">=1</del> <ins class="diff-chg">=0</ins> to <var title="">y</var> = <var title="">y <del class="diff-old">max</del> <ins class= "diff-chg">height</ins></var> <ins class= "diff-chg">-1</ins> , for a particular value of <var title= "">x</var> . Columns can correspond to <code><a href= "#col">col</a></code> elements, but in the <del class= "diff-old">absense</del> <ins class="diff-chg">absence</ins> of <code><a href="#col">col</a></code> elements are implied. A <dfn id="row-group" title="concept-row-group">row group</dfn> is a set of <a href="#row0" title="concept-row">rows</a> anchored at a slot <del class="diff-old">(1,</del> <ins class= "diff-chg">(0,</ins> <var title="">group y</var> ) with a particular <var title="">height</var> such that the row group covers all the slots with coordinates ( <var title="">x</var> , <var title="">y</var> ) where <del class="diff-old">1 ≤ </del> <ins class= "diff-chg">0 ≤ </ins> <var title="">x</var>  <  <var title="">x <del class= "diff-old">max</del> <ins class= "diff-chg">width</ins></var> and <var title= "">group y</var>  ≤  <var title= "">y</var>  <  <var title="">group y</var> + <var title="">height</var> . Row groups correspond to <code><a href="#tbody">tbody</a></code> , <code><a href="#thead0">thead</a></code> , and <code><a href= "#tfoot0">tfoot</a></code> elements. Not every row is necessarily in a row group. A <dfn id="column0" title="concept-column-group">column group</dfn> is a set of <a href="#column" title= "concept-column">columns</a> anchored at a slot ( <var title= "">group x</var> , <del class= "diff-old">1)</del> <ins class="diff-chg">0)</ins> with a particular <var title="">width</var> such that the column group covers all the slots with coordinates ( <var title="">x</var> , <var title="">y</var> ) where <var title="">group x</var>  ≤  <var title="">x</var>  <  <var title="">group x</var> + <var title="">width</var> and <del class= "diff-old">1 ≤ </del> <ins class= "diff-chg">0 ≤ </ins> <var title="">y</var>  <  <var title="">y <del class= "diff-old">max</del> <ins class= "diff-chg">height</ins></var> . Column groups correspond to <code><a href="#colgroup">colgroup</a></code> elements. Not every column is necessarily in a column group. <a href="#row-group" title="concept-row-group">Row groups</a> cannot overlap each other. Similarly, <a href="#column0" title= "concept-column-group">column groups</a> cannot overlap each other. A <a href="#cell" title="concept-cell">cell</a> cannot cover slots that are from two or more <a href="#row-group" title= "concept-row-group">row groups</a> . It is, however, possible for a cell to be in multiple <a href="#column0" title= "concept-column-group">column groups</a> . All the slots that form part of one cell are part of zero or one <a href="#row-group" title="concept-row-group">row groups</a> and zero or more <a href= "#column0" title="concept-column-group">column groups</a> . In addition to <a href="#cell" title="concept-cell">cells</a> , <a href="#column" title="concept-column">columns</a> , <a href= "#row0" title="concept-row">rows</a> , <a href="#row-group" title= "concept-row-group">row groups</a> , and <a href="#column0" title= "concept-column-group">column groups</a> , <a href="#table1" title= "concept-table">tables</a> can have a <code><a href= "#caption0">caption</a></code> element associated with them. This gives the table a heading, or legend. A <dfn id="table2">table model error</dfn> is an error with the data represented by <code><a href="#table">table</a></code> elements and their descendants. Documents must not have table model errors. <h5 id="forming"><del class= "diff-old">3.15.11.1.</del> <ins class= "diff-chg">3.13.13.1.</ins> Forming a table</h5> To determine which elements correspond to which slots in a <a href="#table1" title="concept-table">table</a> associated with a <code><a href="#table">table</a></code> element, to determine the dimensions of the table ( <var title="">x <del class= "diff-old">max</del> <ins class="diff-chg">width</ins></var> and <var title="">y <del class="diff-old">max</del> <ins class="diff-chg">height</ins></var> ), and to determine if there are any <a href="#table2" title="table model error">table model errors</a> , user agents must use the following algorithm: <ol> <li> Let <var title="">x <del class= "diff-old">max</del> <ins class="diff-chg">width</ins></var> be zero. </li> <li> Let <var title="">y <del class= "diff-old">max</del> <ins class="diff-chg">height</ins></var> be zero. </li> <li> Let <var title=""><ins class="diff-new">pending</ins> <code><a href="#tfoot0"><ins class= "diff-new">tfoot</ins></a></code> <ins class= "diff-new">elements</ins></var> <ins class="diff-new">be a list of</ins> <code><a href="#tfoot0"><ins class= "diff-new">tfoot</ins></a></code> <ins class="diff-new">elements, initially empty.</ins> </li> <li> <ins class="diff-new">Let</ins> <var title="">the table</var> be the <a href="#table1" title="concept-table">table</a> represented by the <code><a href="#table">table</a></code> element. The <var title="">x <del class="diff-old">max</del> <ins class="diff-chg">width</ins></var> and <var title="">y <del class="diff-old">max</del> <ins class= "diff-chg">height</ins></var> variables give <var title= "">the table</var> 's <del class="diff-old">extent.</del> <ins class="diff-chg">dimensions.</ins> <var title="">The table</var> is initially empty. </li> <li> If the <code><a href="#table">table</a></code> element has no <del class="diff-old">table children,</del> <ins class= "diff-chg">children elements,</ins> then return <var title="">the table</var> (which will be empty), and abort these steps. </li> <li> <ins class="diff-new">Associate the first</ins> <code><a href= "#caption0"><ins class="diff-new">caption</ins></a></code> <ins class="diff-new">element child of the</ins> <code><a href= "#table"><ins class="diff-new">table</ins></a></code> <ins class= "diff-new">element with</ins> <var title=""><ins class= "diff-new">the table</ins></var> .<ins class="diff-new">If there are no such children, then it has no associated</ins> <code><a href="#caption0"><ins class= "diff-new">caption</ins></a></code> <ins class= "diff-new">element.</ins> </li> <li> Let the <var title="">current element</var> be the first element child of the <code><a href="#table">table</a></code> element. If a step in this algorithm ever requires the <var title= "">current element</var> to be <dfn id="advanced" title= "concept-table-advance">advanced to the next child of the <code>table</code></dfn> when there is no such next child, then the <del class="diff-old">algorithm</del> <ins class="diff-chg">user agent</ins> must <del class="diff-old">be aborted at that point and</del> <ins class="diff-chg">jump to</ins> the <del class= "diff-old">algorithm must return</del> <ins class="diff-chg">step labeled</ins> <ins class="diff-chg">end</ins> ,<ins class= "diff-chg">near</ins> the <del class="diff-old">table .</del> <ins class="diff-chg">end of this algorithm.</ins> </li> <li> While the <var title="">current element</var> is not one of the following elements, <a href="#advanced" title= "concept-table-advance">advance <del class="diff-old">the current element to the next child of the table</del></a> <del class= "diff-old">: caption colgroup thead tbody tfoot tr If the current element is a caption , then that is the caption element associated with the table . Otherwise, it has no associated caption element. If the current element is a caption , then while the current element is not one of the following elements, advance</del> the <var title="">current element</var> to the next child of the <code><a href="#table">table</a></code> : <ul class="brief"> <li><code><a href="#colgroup">colgroup</a></code></li> <li><code><a href="#thead0">thead</a></code></li> <li><code><a href="#tbody">tbody</a></code></li> <li><code><a href="#tfoot0">tfoot</a></code></li> <li><code><a href="#tr">tr</a></code></li> </ul> <del class="diff-old">(Otherwise, the current element will already be one of those elements.)</del></li> <li> If the <var title="">current element</var> is a <code><a href= "#colgroup">colgroup</a></code> , follow these substeps: <ol> <li> Column <del class="diff-old">groups.</del> <ins class= "diff-chg">groups</ins> : Process the <var title="">current element</var> according to the appropriate <del class= "diff-old">one of the following two cases:</del> <ins class= "diff-chg">case below:</ins> <dl class="switch"> <dt>If the <var title="">current element</var> has any <code><a href="#col">col</a></code> element children</dt> <dd> Follow these steps: <ol> <li> Let <var title="">x start</var> have the value <ins class="diff-new">of</ins> <var title="">x <del class="diff-old">max</del> <ins class= "diff-chg">width</ins></var> <del class= "diff-old">+1</del> . </li> <li> Let the <var title="">current column</var> be the first <code><a href="#col">col</a></code> element child of the <code><a href="#colgroup">colgroup</a></code> element. </li> <li> <del class="diff-old">Columns.</del> <ins class= "diff-chg">Columns</ins> : If the <var title="">current column</var> <code><a href="#col">col</a></code> element has a <code title="attr-col-span"><a href="#span2">span</a></code> attribute, then parse its value using the <a href="#rules">rules for parsing non-negative integers</a> . If the result of parsing the value is not an error or zero, then let <var title="">span</var> be that value. Otherwise, if the <code><a href="#col">col</a></code> element has no <code title="attr-col-span"><a href="#span2">span</a></code> attribute, or if trying to parse the attribute's value resulted in an error, then let <var title="">span</var> be 1. </li> <li> Increase <var title="">x <del class= "diff-old">max</del> <ins class="diff-chg">width</ins></var> by <var title="">span</var> . </li> <li> Let the last <var title="">span</var> <a href="#column" title= "concept-column">columns</a> in <var title="">the table</var> correspond to the <var title="">current column</var> <code><a href= "#col">col</a></code> element. </li> <li> If <var title="">current column</var> is not the last <code><a href="#col">col</a></code> element child of the <code><a href="#colgroup">colgroup</a></code> element, then let the <var title="">current column</var> be the next <code><a href= "#col">col</a></code> element child of the <code><a href= "#colgroup">colgroup</a></code> element, and return to the <del class="diff-old">third</del> step <del class="diff-old">of this innermost group of steps (columns).</del> <ins class= "diff-chg">labeled</ins> <ins class="diff-chg">columns</ins> . </li> <li> Let all the last <a href="#column" title= "concept-column">columns</a> in <var title="">the table</var> from x= <var title="">x start</var> to x= <var title="">x <del class= "diff-old">max</del> <ins class="diff-chg">width</ins></var> <ins class="diff-chg">-1</ins> form a new <a href="#column0" title="concept-column-group">column group</a> , anchored at the slot ( <var title="">x start</var> , <del class="diff-old">1),</del> <ins class="diff-chg">0),</ins> with width <var title="">x <del class= "diff-old">max</del> <ins class="diff-chg">width</ins></var> - <var title="">x start</var> <del class= "diff-old">-1,</del> , corresponding to the <code><a href= "#colgroup">colgroup</a></code> element. </li> </ol> </dd> <dt>If the <var title="">current element</var> has no <code><a href="#col">col</a></code> element children</dt> <dd> <ol> <li> If the <code><a href="#colgroup">colgroup</a></code> element has a <code title="attr-colgroup-span"><a href="#span0">span</a></code> attribute, then parse its value using the <a href="#rules">rules for parsing non-negative integers</a> . If the result of parsing the value is not an error or zero, then let <var title="">span</var> be that value. Otherwise, if the <code><a href="#colgroup">colgroup</a></code> element has no <code title="attr-col-span"><a href= "#span2">span</a></code> attribute, or if trying to parse the attribute's value resulted in an error, then let <var title= "">span</var> be 1. </li> <li> Increase <var title="">x <del class= "diff-old">max</del> <ins class="diff-chg">width</ins></var> by <var title="">span</var> . </li> <li> Let the last <var title="">span</var> <a href="#column" title= "concept-column">columns</a> in <var title="">the table</var> form a new <a href="#column0" title="concept-column-group">column group</a> , anchored at the slot ( <var title="">x <del class="diff-old">max</del> <ins class= "diff-chg">width</ins></var> - <var title="">span</var> <del class="diff-old">+1, 1),</del> , <ins class= "diff-chg">0),</ins> with width <var title="">span</var> , corresponding to the <code><a href="#colgroup">colgroup</a></code> element. </li> </ol> </dd> </dl> </li> <li> <a href="#advanced" title="concept-table-advance">Advance</a> the <var title="">current element</var> to the next child of the <code><a href="#table">table</a></code> . </li> <li> While the <var title="">current element</var> is not one of the following elements, <a href="#advanced" title= "concept-table-advance">advance</a> the <var title="">current element</var> to the next child of the <code><a href= "#table">table</a></code> : <ul class="brief"> <li><code><a href="#colgroup">colgroup</a></code></li> <li><code><a href="#thead0">thead</a></code></li> <li><code><a href="#tbody">tbody</a></code></li> <li><code><a href="#tfoot0">tfoot</a></code></li> <li><code><a href="#tr">tr</a></code></li> </ul> </li> <li> If the <var title="">current element</var> is a <code><a href= "#colgroup">colgroup</a></code> element, jump to <ins class= "diff-new">the</ins> step <del class="diff-old">1 in these substeps (column groups).</del> <ins class="diff-chg">labeled</ins> <ins class="diff-chg">column groups</ins> <ins class= "diff-chg">above.</ins> </li> </ol> </li> <li> Let <var title="">y current</var> be zero. <del class="diff-old">When the algorithm is aborted, if y current does not equal y max , then that is a table model error .</del> </li> <li> Let the <var title="">list of downward-growing cells</var> be an empty list. </li> <li> <del class="diff-old">Rows.</del> <ins class= "diff-chg">Rows</ins> : While the <var title="">current element</var> is not one of the following elements, <a href= "#advanced" title="concept-table-advance">advance</a> the <var title="">current element</var> to the next child of the <code><a href="#table">table</a></code> : <ul class="brief"> <li><code><a href="#thead0">thead</a></code></li> <li><code><a href="#tbody">tbody</a></code></li> <li><code><a href="#tfoot0">tfoot</a></code></li> <li><code><a href="#tr">tr</a></code></li> </ul> </li> <li> If the <var title="">current element</var> is a <code><a href= "#tr">tr</a></code> , then run the <a href="#algorithm1">algorithm for processing rows</a> , <a href="#advanced" title= "concept-table-advance"><ins class="diff-new">advance</ins></a> <del class="diff-old">(defined below),</del> <ins class= "diff-chg">the</ins> <var title=""><ins class="diff-chg">current element</ins></var> <ins class="diff-chg">to the next child of the</ins> <code><a href="#table"><ins class= "diff-chg">table</ins></a></code> ,<ins class="diff-chg">and return to the step labeled</ins> <ins class="diff-chg">rows</ins> . </li> <li> <ins class="diff-chg">Run the</ins> <a href= "#algorithm0"><ins class="diff-chg">algorithm for ending a row group</ins></a> . </li> <li> <ins class="diff-chg">If the</ins> <var title=""><ins class= "diff-chg">current element</ins></var> <ins class="diff-chg">is a</ins> <code><a href="#tfoot0"><ins class= "diff-chg">tfoot</ins></a></code> , then <ins class="diff-new">add that element to the list of</ins> <var title=""><ins class= "diff-new">pending</ins> <code><a href="#tfoot0"><ins class= "diff-new">tfoot</ins></a></code> <ins class= "diff-new">elements</ins></var> ,<a href="#advanced" title= "concept-table-advance"><ins class="diff-new">advance</ins></a> <ins class="diff-new">the</ins> <var title=""><ins class= "diff-new">current element</ins></var> <ins class="diff-new">to the next child of the</ins> <code><a href="#table"><ins class= "diff-new">table</ins></a></code> ,<ins class="diff-new">and</ins> return to the <del class="diff-old">previous</del> step <del class= "diff-old">(rows).</del> <ins class="diff-chg">labeled</ins> <ins class="diff-chg">rows</ins> . </li> <li> <del class="diff-old">Otherwise,</del> <ins class= "diff-chg">The</ins> <var title=""><ins class="diff-chg">current element</ins></var> <ins class="diff-chg">is either a</ins> <code><a href="#thead0"><ins class= "diff-chg">thead</ins></a></code> <ins class="diff-chg">or a</ins> <code><a href="#tbody"><ins class="diff-chg">tbody</ins></a></code> . <ins class="diff-chg">Run the</ins> <a href= "#algorithm"><ins class="diff-chg">algorithm for processing row groups</ins></a> . </li> <li> <a href="#advanced" title="concept-table-advance"><ins class= "diff-chg">Advance</ins></a> <ins class="diff-chg">the</ins> <var title=""><ins class="diff-chg">current element</ins></var> <ins class="diff-chg">to the next child of the</ins> <code><a href= "#table"><ins class="diff-chg">table</ins></a></code> . </li> <li> <ins class="diff-chg">Return to the step labeled</ins> <ins class="diff-chg">rows</ins> . </li> <li> <ins class="diff-chg">End</ins> :<ins class= "diff-chg">For each</ins> <code><a href="#tfoot0"><ins class= "diff-chg">tfoot</ins></a></code> <ins class="diff-chg">element in the list of</ins> <var title=""><ins class="diff-chg">pending</ins> <code><a href="#tfoot0"><ins class= "diff-chg">tfoot</ins></a></code> <ins class= "diff-chg">elements</ins></var> ,<ins class="diff-chg">in tree order,</ins> run the <a href="#algorithm">algorithm for <del class= "diff-old">ending</del> <ins class="diff-chg">processing row groups</ins></a> . </li> <li> <ins class="diff-chg">If there exists</ins> a <a href="#row0" title="concept-row">row <del class="diff-old">group</del></a> <ins class="diff-chg">or</ins> <a href="#column" title= "concept-column"><ins class="diff-chg">column</ins></a> <ins class= "diff-chg">in the</ins> <a href="#table1" title= "concept-table"><ins class="diff-chg">table</ins></a> <var title= ""><ins class="diff-chg">the table</ins></var> <ins class= "diff-chg">containing only</ins> <ins class="diff-chg">slots</ins> <ins class= "diff-chg">that do not have a</ins> <a href="#cell" title= "concept-cell"><ins class="diff-chg">cell</ins></a> <ins class= "diff-chg">anchored to them, then this is a</ins> <a href= "#table2"><ins class="diff-chg">table model error</ins></a> . </li> <li> <ins class="diff-new">Return</ins> <var title=""><ins class= "diff-new">the table</ins></var> . </li> </ol> <ins class="diff-new">The</ins> <dfn id="algorithm"><ins class= "diff-new">algorithm for processing row groups</ins></dfn> ,<ins class="diff-new">which is invoked by the set of steps above for processing</ins> <code><a href="#thead0"><ins class= "diff-new">thead</ins></a></code> ,<code><a href= "#tbody"><ins class="diff-new">tbody</ins></a></code> ,<ins class= "diff-new">and</ins> <code><a href="#tfoot0"><ins class= "diff-new">tfoot</ins></a></code> <ins class="diff-new">elements, is:</ins> <ol> <li> Let <var title="">y start</var> have the value <ins class="diff-chg">of</ins> <var title="">y <del class="diff-old">max</del> <ins class= "diff-chg">height</ins> <del class="diff-old">+1 .</del></var> . </li> <li> For each <code><a href="#tr">tr</a></code> element that is a child of the <del class="diff-old">current</del> element <del class="diff-old">,</del> <ins class="diff-chg">being processed,</ins> in tree order, run the <a href= "#algorithm1">algorithm for processing rows <del class= "diff-old">(defined below).</del></a> . </li> <li> If <var title="">y <del class= "diff-old">max</del> <ins class="diff-chg">height</ins></var> <del class="diff-old"> ≥ </del> <ins class= "diff-chg"> > </ins> <var title="">y start</var> , then let all the last <a href="#row0" title="concept-row">rows</a> in <var title="">the table</var> from y= <var title="">y start</var> to y= <var title="">y <del class= "diff-old">max</del> <ins class="diff-chg">height</ins></var> <ins class="diff-chg">-1</ins> form a new <a href= "#row-group" title="concept-row-group">row group</a> , anchored at the slot with coordinate <del class="diff-old">(1,</del> <ins class="diff-chg">(0,</ins> <var title="">y start</var> ), with height <var title="">y <del class="diff-old">max</del> <ins class= "diff-chg">height</ins></var> - <var title="">y start</var> <del class="diff-old">+1,</del> , corresponding to the <var title="">current element</var> . </li> <li> Run the <a href="#algorithm0">algorithm for ending a row group <del class="diff-old">again. Return to step 12 (rows).</del></a> . </li> </ol> The <dfn id="algorithm0">algorithm for ending a row group</dfn> , which is invoked by the set of steps above when starting and ending a block of rows, is: <ol> <li> <del class="diff-old">If y current is less than y max , then this is a table model error .</del> While <var title="">y current</var> is less than <var title="">y <del class="diff-old">max</del> <ins class= "diff-chg">height</ins></var> , follow these steps: <ol> <li> <ins class="diff-new">Run the</ins> <a href= "#algorithm2"><ins class="diff-new">algorithm for growing downward-growing cells</ins></a> . </li> <li> Increase <var title="">y current</var> by 1. <del class="diff-old">Run the algorithm for growing downward-growing cells .</del></li> </ol> </li> <li> Empty the <var title="">list of downward-growing cells</var> . </li> </ol> The <dfn id="algorithm1">algorithm for processing rows</dfn> , which is invoked by the set of steps above for processing <code><a href="#tr">tr</a></code> elements, is: <ol> <li> <del class="diff-old">Increase</del> <ins class= "diff-chg">If</ins> <var title=""><ins class="diff-chg">y</ins> <ins class="diff-chg">height</ins></var> <ins class="diff-chg">is equal to</ins> <var title="">y current</var> , <ins class="diff-new">then increase</ins> <var title=""><ins class="diff-new">y</ins> <ins class="diff-new">height</ins></var> by 1. <del class= "diff-old">Run the algorithm for growing downward-growing cells .</del> <ins class="diff-chg">(</ins> <var title=""><ins class= "diff-chg">y</ins> <ins class= "diff-chg">current</ins></var> <ins class="diff-chg">is never</ins> <ins class="diff-chg">greater</ins> <ins class="diff-chg">than</ins> <var title=""><ins class= "diff-chg">y</ins> <ins class= "diff-chg">height</ins></var> .) </li> <li> Let <var title="">x current</var> be <del class="diff-old">1. If the tr element being processed contains no td or th elements, then abort this set of steps and return to the algorithm above.</del> <ins class="diff-chg">0.</ins> </li> <li> Let <var title="">current cell</var> be the first <code><a href= "#td">td</a></code> or <code><a href="#th">th</a></code> element in the <code><a href="#tr">tr</a></code> element being processed. </li> <li> <ins class="diff-new">Run the</ins> <a href= "#algorithm2"><ins class="diff-new">algorithm for growing downward-growing cells</ins></a> . </li> <li> <del class="diff-old">Cells.</del> <ins class= "diff-chg">Cells</ins> : While <var title="">x current</var> is less than <del class="diff-old">or equal to</del> <var title="">x <del class= "diff-old">max</del> <ins class="diff-chg">width</ins></var> and the slot with coordinate ( <var title="">x current</var> , <var title="">y current</var> ) already has a cell assigned to it, increase <var title="">x current</var> by 1. </li> <li> If <var title="">x current</var> is <del class="diff-old">greater than</del> <ins class= "diff-chg">equal to</ins> <var title="">x <del class= "diff-old">max</del> <ins class="diff-chg">width</ins></var> , increase <var title="">x <del class= "diff-old">max</del> <ins class="diff-chg">width</ins></var> by <del class="diff-old">1 (which will make them equal).</del> <ins class="diff-chg">1. (</ins> <var title=""><ins class= "diff-chg">x</ins> <ins class= "diff-chg">current</ins></var> <ins class="diff-chg">is never</ins> <ins class="diff-chg">greater</ins> <ins class="diff-chg">than</ins> <var title=""><ins class= "diff-chg">x</ins> <ins class= "diff-chg">width</ins></var> .) </li> <li> If the <var title="">current cell</var> has a <code title= "attr-tdth-colspan"><a href="#colspan">colspan</a></code> attribute, then <a href="#rules" title= "rules for parsing non-negative integers">parse that attribute's value <del class="diff-old">,</del></a> , and let <var title= "">colspan</var> be the result. If parsing that value failed, or returned zero, or if the attribute is absent, then let <var title="">colspan</var> be 1, instead. </li> <li> If the <var title="">current cell</var> has a <code title= "attr-tdth-rowspan"><a href="#rowspan">rowspan</a></code> attribute, then <a href="#rules" title= "rules for parsing non-negative integers">parse that attribute's value <del class="diff-old">,</del></a> , and let <var title= "">rowspan</var> be the result. If parsing that value failed or if the attribute is absent, then let <var title="">rowspan</var> be 1, instead. </li> <li> If <var title="">rowspan</var> is zero, then let <var title= "">cell grows downward</var> be true, and set <var title= "">rowspan</var> to 1. Otherwise, let <var title="">cell grows downward</var> be false. </li> <li> If <var title="">x <del class= "diff-old">max</del> <ins class="diff-chg">width</ins></var>  <  <var title="">x current</var> + <var title="">colspan</var> <del class="diff-old">-1</del> , then let <var title="">x <del class= "diff-old">max</del> <ins class="diff-chg">width</ins></var> be <var title="">x current</var> + <var title="">colspan</var> <del class="diff-old">-1.</del> . </li> <li> If <var title="">y <del class= "diff-old">max</del> <ins class="diff-chg">height</ins></var>  <  <var title="">y current</var> + <var title="">rowspan</var> <del class="diff-old">-1</del> , then let <var title="">y <del class= "diff-old">max</del> <ins class="diff-chg">height</ins></var> be <var title="">y current</var> + <var title="">rowspan</var> <del class="diff-old">-1.</del> . </li> <li> Let the slots with coordinates ( <var title="">x</var> , <var title="">y</var> ) such that <var title="">x current</var>  ≤  <var title="">x</var>  <  <var title="">x current</var> + <var title="">colspan</var> and <var title="">y current</var>  ≤  <var title= "">y</var>  <  <var title="">y current</var> + <var title="">rowspan</var> be covered by a new <a href="#cell" title="concept-cell">cell</a> <var title="">c</var> , anchored at ( <var title="">x current</var> , <var title="">y current</var> ), which has width <var title= "">colspan</var> and height <var title="">rowspan</var> , corresponding to the <var title="">current cell</var> element. If the <var title="">current cell</var> element is a <code><a href="#th">th</a></code> element, let this new cell <var title="">c</var> be a header cell; otherwise, let it be a data cell. To establish what header cells apply to a data cell, use the <a href="#algorithm3">algorithm for assigning header cells to data cells</a> described in the next section. If any of the slots involved already had a <a href="#cell" title="concept-cell">cell</a> covering them, then this is a <a href="#table2">table model error</a> . Those slots now have two cells overlapping. </li> <li> If <var title="">cell grows downward</var> is true, then add the tuple { <var title="">c</var> , <var title="">x current</var> , <var title="">colspan</var> } to the <var title="">list of downward-growing cells</var> . </li> <li> Increase <var title="">x current</var> by <var title="">colspan</var> . </li> <li> If <var title="">current cell</var> is the last <code><a href= "#td">td</a></code> or <code><a href="#th">th</a></code> element in the <code><a href="#tr">tr</a></code> element being processed, then <ins class="diff-new">increase</ins> <var title=""><ins class= "diff-new">y</ins> <ins class= "diff-new">current</ins></var> <ins class="diff-new">by 1,</ins> abort this set of <del class="diff-old">steps</del> <ins class="diff-chg">steps,</ins> and return to the algorithm above. </li> <li> Let <var title="">current cell</var> be the next <code><a href= "#td">td</a></code> or <code><a href="#th">th</a></code> element in the <code><a href="#tr">tr</a></code> element being processed. </li> <li> Return to step 5 (cells). </li> </ol> <del class="diff-old">The</del> <ins class="diff-chg">When the algorithms above require the user agent to run the</ins> <dfn id= "algorithm2">algorithm for growing downward-growing cells</dfn> , <del class="diff-old">used when adding a new row, is as follows: If the list of downward-growing cells is empty, do nothing. Abort these steps; return to</del> the <del class="diff-old">step that invoked this algorithm. Otherwise, if y max is less than y current , then increase y max by 1 (this will make it equal to y current ). For</del> <ins class="diff-chg">user agent must, for</ins> each { <var title="">cell</var> , <var title="">cell x</var> , <var title="">width</var> } tuple in the <var title="">list of downward-growing cells</var> , <ins class= "diff-new">if any,</ins> extend the <a href="#cell" title= "concept-cell">cell</a> <var title="">cell</var> so that it also covers the slots with coordinates ( <var title="">x</var> , <var title="">y current</var> ), where <var title="">cell x</var>  ≤  <var title="">x</var>  <  <var title="">cell x</var> + <var title="">width</var> <del class= "diff-old">-1</del> . <del class="diff-old">If, after establishing which elements correspond to which slots, there exists a column in the table containing only slots that do not have a cell anchored to them, then this is a table model error .</del> <h5 id="header-and-data-cell-semantics"><del class="diff-old">3.15.11.2.</del> <ins class= "diff-chg">3.13.13.2.</ins> Forming relationships between data cells and header cells</h5> Each data cell can be assigned zero or more header cells. The <dfn id="algorithm3">algorithm for assigning header cells to data cells</dfn> is as follows. <ol> <li> For each header cell in the table, in <a href="#tree-order">tree order <del class="diff-old">:</del></a> , <ins class="diff-chg">run these substeps:</ins> <ol> <li> Let ( <var title="">header x</var> , <var title="">header y</var> ) be the coordinate of the slot to which the header cell is anchored. </li> <li> <ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">header</ins> <ins class= "diff-new">width</ins></var> <ins class="diff-new">be the width of the header cell.</ins> </li> <li> <ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">header</ins> <ins class= "diff-new">height</ins></var> <ins class="diff-new">be the height of the header cell.</ins> </li> <li> <ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">data cells</ins></var> <ins class="diff-new">be a list of data cells, initially empty.</ins> </li> <li> Examine the <code title="attr-th-scope"><a href= "#scope0">scope</a></code> attribute of the <code><a href= "#th">th</a></code> element corresponding to the header cell, and, based on its state, apply the appropriate substep: <dl class="switch"> <dt>If it is in the <a href= "#row">row</a> state</dt> <dd> <del class="diff-old">Assign</del> <ins class="diff-chg">Add all</ins> the <del class="diff-old">header cell to any</del> data cells <del class="diff-old">anchored at</del> <ins class= "diff-chg">that cover</ins> slots with coordinates ( <var title= ""><del class="diff-old">data</del> <ins class= "diff-chg">slot</ins> x</var> , <var title= ""><del class="diff-old">data</del> <ins class= "diff-chg">slot</ins> y</var> <del class= "diff-old">)</del> <ins class="diff-chg">),</ins> where <var title="">header x</var> <del class= "diff-old"> < </del> <ins class="diff-chg">+</ins> <var title=""><del class="diff-old">data</del> <ins class= "diff-chg">header</ins> <del class="diff-old">x</del> <ins class="diff-chg">width</ins></var>  ≤  <var title=""><ins class="diff-new">slot</ins> <ins class="diff-new">x</ins></var> <ins class= "diff-new"> < </ins> <var title="">x <del class="diff-old">max</del> <ins class= "diff-chg">width</ins></var> and <var title= ""><del class="diff-old">data</del> <ins class= "diff-chg">header</ins> y</var> <del class= "diff-old"> = </del> <ins class= "diff-chg"> ≤ </ins> <var title=""><ins class= "diff-chg">slot</ins> <ins class= "diff-chg">y</ins></var> <ins class= "diff-chg"> < </ins> <var title="">header y</var> <ins class="diff-new">+</ins> <var title= ""><ins class="diff-new">header</ins> <ins class= "diff-new">height</ins></var> <del class= "diff-old">.</del> , <ins class="diff-chg">to the</ins> <var title=""><ins class="diff-chg">data cells</ins></var> <ins class="diff-chg">list.</ins> </dd> <dt>If it is in the <a href= "#col0">column</a> state</dt> <dd> <del class="diff-old">Assign</del> <ins class="diff-chg">Add all</ins> the <del class="diff-old">header cell to any</del> data cells <del class="diff-old">anchored at</del> <ins class= "diff-chg">that cover</ins> slots with coordinates ( <var title= ""><del class="diff-old">data</del> <ins class= "diff-chg">slot</ins> x</var> , <var title= ""><del class="diff-old">data</del> <ins class= "diff-chg">slot</ins> y</var> <del class= "diff-old">)</del> <ins class="diff-chg">),</ins> where <var title=""><del class="diff-old">data</del> <ins class= "diff-chg">header</ins> x</var> <del class= "diff-old"> = </del> <ins class= "diff-chg"> ≤ </ins> <var title=""><ins class= "diff-chg">slot</ins> <ins class= "diff-chg">x</ins></var> <ins class= "diff-chg"> < </ins> <var title="">header x</var> <ins class="diff-new">+</ins> <var title= ""><ins class="diff-new">header</ins> <ins class= "diff-new">width</ins></var> and <var title= "">header y</var> <del class= "diff-old"> < </del> <ins class="diff-chg">+</ins> <var title=""><del class="diff-old">data</del> <ins class= "diff-chg">header</ins> <del class="diff-old">y</del> <ins class="diff-chg">height</ins></var>  ≤  <var title=""><ins class="diff-new">slot</ins> <ins class="diff-new">y</ins></var> <ins class= "diff-new"> < </ins> <var title="">y <del class="diff-old">max</del> <ins class= "diff-chg">height</ins></var> <del class= "diff-old">.</del> , <ins class="diff-chg">to the</ins> <var title=""><ins class="diff-chg">data cells</ins></var> <ins class="diff-chg">list.</ins> </dd> <dt>If it is in the <a href= "#rowgroup">row group</a> state</dt> <dd> If the header cell is not in a <a href="#row-group" title= "concept-row-group">row group</a> , then <del class= "diff-old">don't assign the header cell to any data cells.</del> <ins class="diff-chg">do nothing.</ins> Otherwise, let <del class="diff-old">(1,</del> <ins class= "diff-chg">(0,</ins> <var title="">group y</var> ) be the slot at which the row group is anchored, let <var title="">height</var> be the number of rows in the row group, and <del class="diff-old">assign</del> <ins class= "diff-chg">add all</ins> the <del class="diff-old">header cell to any</del> data cells <del class="diff-old">anchored at</del> <ins class="diff-chg">that cover</ins> slots with coordinates ( <var title=""><del class="diff-old">data</del> <ins class= "diff-chg">slot</ins> x</var> , <var title= ""><del class="diff-old">data</del> <ins class= "diff-chg">slot</ins> y</var> <del class= "diff-old">)</del> <ins class="diff-chg">),</ins> where <var title="">header x</var>  ≤  <var title=""><del class="diff-old">data</del> <ins class="diff-chg">slot</ins> x</var> <del class="diff-old"> ≤ </del> <ins class= "diff-chg"> < </ins> <var title="">x <del class="diff-old">max</del> <ins class= "diff-chg">width</ins></var> and <var title= "">header y</var>  ≤  <var title= ""><del class="diff-old">data</del> <ins class= "diff-chg">slot</ins> y</var>  <  <var title="">group y</var> + <var title= "">height</var> <del class="diff-old">.</del> , <ins class= "diff-chg">to the</ins> <var title=""><ins class="diff-chg">data cells</ins></var> <ins class="diff-chg">list.</ins> </dd> <dt>If it is in the <a href= "#colgroup0">column group</a> state</dt> <dd> If the header cell is not <ins class="diff-new">anchored</ins> in a <a href="#column0" title="concept-column-group">column group</a> , then <del class="diff-old">don't assign the header cell to any data cells.</del> <ins class="diff-chg">do nothing.</ins> Otherwise, let ( <var title="">group x</var> , <del class="diff-old">1)</del> <ins class="diff-chg">0)</ins> be the slot at which <del class="diff-old">the</del> <ins class= "diff-chg">that</ins> column group is anchored, let <var title= "">width</var> be the number of columns in the column group, and <del class="diff-old">assign</del> <ins class="diff-chg">add all</ins> the <del class="diff-old">header cell to any</del> data cells <del class="diff-old">anchored at</del> <ins class= "diff-chg">that cover</ins> slots with coordinates ( <var title= ""><del class="diff-old">data</del> <ins class= "diff-chg">slot</ins> x</var> , <var title= ""><del class="diff-old">data</del> <ins class= "diff-chg">slot</ins> y</var> <del class= "diff-old">)</del> <ins class="diff-chg">),</ins> where <var title="">header x</var>  ≤  <var title=""><del class="diff-old">data</del> <ins class="diff-chg">slot</ins> x</var>  <  <var title="">group x</var> + <var title="">width</var> and <var title="">header y</var>  ≤  <var title=""><del class= "diff-old">data</del> <ins class="diff-chg">slot</ins> y</var> <del class="diff-old"> ≤ </del> <ins class="diff-chg"> < </ins> <var title="">y <del class="diff-old">max</del> <ins class= "diff-chg">height</ins></var> <del class= "diff-old">.</del> , <ins class="diff-chg">to the</ins> <var title=""><ins class="diff-chg">data cells</ins></var> <ins class="diff-chg">list.</ins> </dd> <dt>Otherwise, it is in the auto state</dt> <dd> <ins class="diff-new">Run these steps:</ins> <ol> <li> If the header cell is <del class="diff-old">not in the first row of the table, or not in the first cell of</del> <a href= "#equivalent"><ins class="diff-chg">equivalent to</ins> a <del class="diff-old">row,</del> <ins class="diff-chg">wide cell</ins></a> ,<ins class="diff-chg">let</ins> <var title= ""><ins class="diff-chg">header</ins> <ins class= "diff-chg">width</ins></var> <ins class= "diff-chg">equal</ins> <var title=""><ins class= "diff-chg">x</ins> <ins class= "diff-chg">width</ins></var> <ins class="diff-chg">-</ins> <var title=""><ins class="diff-chg">header</ins> <ins class="diff-chg">x</ins></var> .<a href= "#references"><ins class="diff-chg">[UNICODE]</ins></a> </li> <li> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">x</ins></var> <ins class="diff-chg">equal</ins> <var title=""><ins class="diff-chg">header</ins> <ins class="diff-chg">x</ins></var> <ins class= "diff-chg">+</ins> <var title=""><ins class="diff-chg">header</ins> <ins class="diff-chg">width</ins></var> . </li> <li> <ins class="diff-chg">Horizontal</ins> :<ins class= "diff-chg">If</ins> <var title=""><ins class= "diff-chg">x</ins></var> <ins class="diff-chg">is equal to</ins> <var title=""><ins class="diff-chg">x</ins> <ins class="diff-chg">width</ins></var> , then <del class= "diff-old">don't assign</del> <ins class="diff-chg">jump down to</ins> the <ins class="diff-new">step below labeled</ins> <ins class="diff-new">vertical</ins> . </li> <li> <ins class="diff-new">If there is a</ins> header cell <ins class="diff-new">anchored at (</ins> <var title=""><ins class= "diff-new">x</ins></var> ,<var title=""><ins class= "diff-new">header</ins> <ins class= "diff-new">y</ins></var> <ins class="diff-new">) with height</ins> <var title=""><ins class="diff-new">header</ins> <ins class="diff-new">height</ins></var> ,<ins class="diff-new">then jump down</ins> to <del class= "diff-old">any</del> <ins class="diff-chg">the step below labeled</ins> <ins class="diff-chg">vertical</ins> . </li> <li> <ins class="diff-chg">Add all the</ins> data <del class= "diff-old">cells.</del> <ins class="diff-chg">cells that cover slots with coordinates (</ins> <var title=""><ins class= "diff-chg">slot</ins> <ins class= "diff-chg">x</ins></var> ,<var title=""><ins class= "diff-chg">slot</ins> <ins class= "diff-chg">y</ins></var> <ins class="diff-chg">), where</ins> <var title=""><ins class="diff-chg">slot</ins> <ins class="diff-chg">x</ins></var> <ins class= "diff-chg"> = </ins> <var title=""><ins class= "diff-chg">x</ins></var> <ins class="diff-chg">and</ins> <var title=""><ins class="diff-chg">header</ins> <ins class="diff-chg">y</ins></var> <ins class= "diff-chg"> ≤ </ins> <var title=""><ins class= "diff-chg">slot</ins> <ins class= "diff-chg">y</ins></var> <ins class= "diff-chg"> < </ins> <var title=""><ins class= "diff-chg">header</ins> <ins class= "diff-chg">y</ins></var> <ins class="diff-chg">+</ins> <var title=""><ins class="diff-chg">header</ins> <ins class="diff-chg">height</ins></var> ,<ins class="diff-chg">to the</ins> <var title=""><ins class= "diff-chg">data cells</ins></var> <ins class= "diff-chg">list.</ins> </li> <li> <del class="diff-old">Otherwise, if</del> <ins class= "diff-chg">Increase</ins> <var title=""><ins class= "diff-chg">x</ins></var> <ins class="diff-chg">by 1.</ins> </li> <li> <ins class="diff-chg">Jump up to</ins> the <ins class= "diff-new">step above labeled</ins> <ins class= "diff-new">horizontal</ins> . </li> <li> <ins class="diff-new">Vertical</ins> :<ins class= "diff-new">Let</ins> <var title=""><ins class= "diff-new">y</ins></var> <ins class="diff-new">equal</ins> <var title="">header <ins class= "diff-new">y</ins></var> <ins class="diff-new">+</ins> <var title=""><ins class="diff-new">header</ins> <ins class="diff-new">height</ins></var> . </li> <li> <ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">y</ins></var> <ins class="diff-new">is equal to</ins> <var title=""><ins class="diff-new">y</ins> <ins class="diff-new">height</ins></var> ,<ins class= "diff-new">then jump to the step below labeled</ins> <ins class= "diff-new">end</ins> . </li> <li> <ins class="diff-new">If there is a header cell</ins> <var title=""><ins class="diff-new">cell</ins></var> <ins class= "diff-new">anchored at (</ins> <var title=""><ins class= "diff-new">header</ins> <ins class= "diff-new">x</ins></var> ,<var title=""><ins class= "diff-new">y</ins></var> <ins class="diff-new">), then follow these substeps:</ins> <ol> <li> <ins class="diff-new">If the header cell</ins> <var title= "">cell</var> is <del class="diff-old">in</del> <a href= "#equivalent"><ins class="diff-chg">equivalent to a wide cell</ins></a> ,<ins class="diff-chg">then let</ins> <var title= ""><ins class="diff-chg">width</ins></var> <ins class= "diff-chg">be</ins> <var title=""><ins class= "diff-chg">x</ins> <ins class= "diff-chg">width</ins></var> <ins class="diff-chg">-</ins> <var title=""><ins class="diff-chg">header</ins> <ins class="diff-chg">x</ins></var> .<ins class= "diff-chg">Otherwise, let</ins> <var title=""><ins class= "diff-chg">width</ins></var> <ins class="diff-chg">be</ins> the <del class="diff-old">first row</del> <ins class= "diff-chg">width</ins> of the <del class="diff-old">table, assign the</del> header cell <var title=""><ins class= "diff-new">cell</ins></var> . </li> <li> <ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">width</ins></var> <ins class="diff-new">is equal</ins> to <del class="diff-old">any</del> <var title=""><ins class= "diff-chg">header</ins> <ins class= "diff-chg">width</ins></var> ,<ins class="diff-chg">then jump to the step below labeled</ins> <ins class= "diff-chg">end</ins> . </li> </ol> </li> <li> <ins class="diff-chg">Add all the</ins> data cells <del class= "diff-old">anchored at</del> <ins class="diff-chg">that cover</ins> slots with coordinates ( <var title=""><del class= "diff-old">data</del> <ins class="diff-chg">slot</ins> x</var> , <var title=""><del class="diff-old">data</del> <ins class="diff-chg">slot</ins> y</var> <del class="diff-old">)</del> <ins class="diff-chg">),</ins> where <var title=""><del class="diff-old">data</del> <ins class= "diff-chg">header</ins> x</var> <del class= "diff-old"> = </del> <ins class= "diff-chg"> ≤ </ins> <var title=""><ins class= "diff-chg">slot</ins> <ins class= "diff-chg">x</ins></var> <ins class= "diff-chg"> < </ins> <var title="">header x</var> <ins class="diff-new">+</ins> <var title= ""><ins class="diff-new">header</ins> <ins class= "diff-new">width</ins></var> and <var title= ""><del class="diff-old">header</del> <ins class= "diff-chg">slot</ins> y</var> <del class= "diff-old"> < </del> <ins class= "diff-chg"> = </ins> <var title=""><del class= "diff-old">data</del> y</var> , <ins class="diff-new">to the</ins> <var title=""><ins class="diff-new">data cells</ins></var> <del class="diff-old"> ≤ </del> <ins class="diff-chg">list.</ins> </li> <li> <ins class="diff-chg">Increase</ins> <var title="">y <del class= "diff-old">max</del></var> <ins class="diff-chg">by 1.</ins> </li> <li> <ins class="diff-chg">Jump up to the step above labeled</ins> <ins class="diff-chg">vertical</ins> . </li> <li> <ins class="diff-new">End</ins> :<ins class= "diff-new">Coalesce all the duplicate entries in the</ins> <var title=""><ins class="diff-new">data cells</ins></var> <ins class="diff-new">list, so that each data cell is only present once, in tree order.</ins> </li> </ol> </dd> </dl> </li> <li> <ins class="diff-new">Assign the header cell to all the data cells in the</ins> <var title=""><ins class="diff-new">data cells</ins></var> <ins class="diff-new">list that correspond to</ins> <code><del class="diff-old">.</del> <a href= "#td"><ins class="diff-chg">td</ins></a></code> <ins class= "diff-chg">elements that do not have a</ins> <code title= "attr-td-headers"><a href="#headers"><ins class= "diff-chg">headers</ins></a></code> <ins class="diff-chg">attribute specified.</ins> </li> </ol> </li> <li> <ins class="diff-chg">For each data cell in the table, in</ins> <a href="#tree-order"><ins class="diff-chg">tree order</ins></a> ,<ins class="diff-chg">run these substeps:</ins> <ol> <li> <ins class="diff-chg">If the data cell corresponds to a</ins> <code><a href="#td"><ins class="diff-chg">td</ins></a></code> <ins class="diff-chg">element that does not have a</ins> <code title="attr-td-headers"><a href="#headers"><ins class= "diff-chg">headers</ins></a></code> <ins class="diff-chg">attribute specified, then skip these substeps and move on to the next data cell (if any).</ins> </li> <li> Otherwise, <ins class="diff-new">take the value of the</ins> <code title="attr-td-headers"><a href="#headers"><ins class= "diff-new">headers</ins></a></code> <ins class="diff-new">attribute and</ins> <a href="#split" title= "split a string on spaces"><ins class="diff-new">split it on spaces</ins></a> ,<ins class="diff-new">letting</ins> <var title= ""><ins class="diff-new">id list</ins></var> <ins class= "diff-new">be the list of tokens obtained.</ins> </li> <li> <ins class="diff-new">For each token in</ins> the <var title= ""><ins class="diff-new">id list</ins></var> ,<ins class= "diff-new">run the following steps:</ins> <ol> <li> <ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">id</ins></var> <ins class="diff-new">be the token.</ins> </li> <li> <ins class="diff-new">If there is a</ins> header cell <del class="diff-old">is</del> in the <del class="diff-old">first column of</del> <a href="#table1" title="concept-table"><ins class= "diff-chg">table</ins></a> <ins class="diff-chg">whose corresponding</ins> <code><a href="#th"><ins class= "diff-chg">th</ins></a></code> <ins class="diff-chg">element has an ID that is equal to</ins> the <del class="diff-old">table;</del> <ins class="diff-chg">value of</ins> <var title=""><ins class= "diff-chg">id</ins></var> ,<ins class="diff-chg">then</ins> assign <del class="diff-old">the</del> <ins class="diff-chg">that</ins> header cell to <del class="diff-old">any</del> <ins class= "diff-chg">the</ins> data <del class="diff-old">cells</del> <ins class="diff-chg">cell.</ins> </li> </ol> </li> </ol> </li> </ol> <ins class="diff-chg">A header cell</ins> anchored at <ins class="diff-new">(</ins> <var title=""><ins class= "diff-new">header</ins> <ins class= "diff-new">x</ins></var> ,<var title=""><ins class= "diff-new">header</ins> <ins class= "diff-new">y</ins></var> <ins class="diff-new">) with width</ins> <var title=""><ins class="diff-new">header</ins> <ins class="diff-new">width</ins></var> <ins class="diff-new">and height</ins> <var title=""><ins class= "diff-new">header</ins> <ins class= "diff-new">height</ins></var> <ins class="diff-new">is said to be</ins> <dfn id="equivalent"><ins class="diff-new">equivalent to a wide cell</ins></dfn> <ins class="diff-new">if all the</ins> slots with coordinates ( <var title=""><del class= "diff-old">data</del> <ins class="diff-chg">slot</ins> x</var> , <var title=""><del class="diff-old">data</del> <ins class="diff-chg">slot</ins> y</var> <del class="diff-old">)</del> <ins class="diff-chg">),</ins> where <var title="">header x</var> <del class= "diff-old"> < </del> <ins class="diff-chg">+</ins> <var title=""><del class="diff-old">data</del> <ins class= "diff-chg">header</ins> <del class="diff-old">x</del> <ins class="diff-chg">width</ins></var>  ≤  <var title=""><ins class="diff-new">slot</ins> <ins class="diff-new">x</ins></var> <ins class= "diff-new"> < </ins> <var title="">x <del class="diff-old">max</del> <ins class= "diff-chg">width</ins></var> and <var title= ""><del class="diff-old">data</del> <ins class= "diff-chg">header</ins> y</var> <del class= "diff-old"> = </del> <ins class= "diff-chg"> ≤ </ins> <var title=""><ins class= "diff-chg">slot</ins> <ins class= "diff-chg">y</ins></var> <ins class= "diff-chg"> < </ins> <var title="">header y</var> <ins class="diff-new">+</ins> <var title= ""><ins class="diff-new">header</ins> <ins class= "diff-new">height</ins> <del class= "diff-old">.</del></var> , <ins class="diff-chg">are all either empty or covered by</ins> <a href="#empty0" title= "empty data cell"><ins class="diff-chg">empty data cells</ins></a> . <ins class="diff-chg">A data cell is said to be an</ins> <dfn id="empty0"><ins class="diff-chg">empty data cell</ins></dfn> <ins class="diff-chg">if it contains no elements and its text content, if any, consists only of characters in the Unicode character class Zs.</ins> <a href="#references"><ins class= "diff-chg">[UNICODE]</ins></a> <ins class="diff-chg">User agents may remove</ins> <a href= "#empty0" title="empty data cell"><ins class="diff-chg">empty data cells</ins></a> <ins class="diff-chg">when analyzing data in a</ins> <a href="#table1" title="concept-table"><ins class= "diff-chg">table</ins></a> . <h3 id="forms"><del class= "diff-old">3.16.</del> <ins class="diff-chg">3.14</ins> Forms</h3> This section will contain definitions of the <code>form</code> element and so forth. This section will be a rewrite of the HTML4 Forms and Web Forms 2.0 specifications, with hopefully no normative changes. <h4 id="the-form"><del class= "diff-old">3.16.1.</del> <ins class="diff-chg">3.14.1</ins> The <code>form</code> element</h4> <h4 id="the-fieldset"><del class= "diff-old">3.16.2.</del> <ins class="diff-chg">3.14.2</ins> The <code>fieldset</code> element</h4> <h4 id="the-input"><del class= "diff-old">3.16.3.</del> <ins class="diff-chg">3.14.3</ins> The <code>input</code> element</h4> <h4 id="the-button"><del class= "diff-old">3.16.4.</del> <ins class="diff-chg">3.14.4</ins> The <code>button</code> element</h4> <h4 id="the-label"><del class= "diff-old">3.16.5.</del> <ins class="diff-chg">3.14.5</ins> The <code>label</code> element</h4> <h4 id="the-select"><del class= "diff-old">3.16.6.</del> <ins class="diff-chg">3.14.6</ins> The <code>select</code> element</h4> <h4 id="the-datalist"><del class= "diff-old">3.16.7.</del> <ins class="diff-chg">3.14.7</ins> The <code>datalist</code> element</h4> <h4 id="the-optgroup"><del class= "diff-old">3.16.8.</del> <ins class="diff-chg">3.14.8</ins> The <code>optgroup</code> element</h4> <h4 id="the-option"><del class= "diff-old">3.16.9.</del> <ins class="diff-chg">3.14.9</ins> The <code>option</code> element</h4> <h4 id="the-textarea"><del class= "diff-old">3.16.10.</del> <ins class= "diff-chg">3.14.10</ins> The <code>textarea</code> element</h4> <h4 id="the-output"><del class= "diff-old">3.16.11.</del> <ins class= "diff-chg">3.14.11</ins> The <code>output</code> element</h4> <h4 id="processing0"><del class= "diff-old">3.16.12.</del> <ins class= "diff-chg">3.14.12</ins> Processing model</h4> See <a href= "http://www.whatwg.org/specs/web-forms/current-work/#extend-form-controls"> WF2</a> for now <h5 id="form-submission"><del class= "diff-old">3.16.12.1.</del> <ins class= "diff-chg">3.14.12.1.</ins> Form submission</h5> See <a href= "http://www.whatwg.org/specs/web-forms/current-work/#form-submission"> WF2</a> for now <ins class= "diff-new">If a form is in a browsing context whose</ins> <a href= "#sandboxed3"><ins class="diff-new">sandboxed forms browsing context flag</ins></a> <ins class="diff-new">is set, it must not be submitted.</ins> <h3 id="scripting0"><del class= "diff-old">3.17.</del> <ins class="diff-chg">3.15</ins> Scripting</h3> <ins class="diff-new">Scripts allow authors to add interactivity to their documents.</ins> <ins class="diff-new">Authors are encouraged to use declarative alternatives to scripting where possible, as declarative mechanisms are often more maintainable, and many users disable scripting.</ins> <div class="example"> <ins class="diff-new">For example, instead of using script to show or hide a section to show more details, the</ins> <code><a href="#details"><ins class= "diff-new">details</ins></a></code> <ins class="diff-new">element could be used.</ins> </div> <ins class="diff-new">Authors are also encouraged to make their applications degrade gracefully in the absence of scripting support.</ins> <div class="example"> <ins class="diff-new">For example, if an author provides a link in a table header to dynamically resort the table, the link could also be made to function without scripts by requesting the sorted table from the server.</ins> </div> <h4 id="script"><del class= "diff-old">3.17.1.</del> <ins class="diff-chg">3.15.1</ins> The <dfn id="script1"><code>script</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#metadata0">Metadata content</a> .</dd> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#metadata0">metadata content</a> is expected.</dd> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd>If there is no <code title="attr-script-src"><a href= "#src9">src</a></code> attribute, depends on the value of the <code title="attr-script-type"><a href="#type11">type</a></code> attribute.</dd> <dd>If there is a <code title="attr-script-src"><a href= "#src9">src</a></code> attribute, the element must be empty.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-script-src"><a href= "#src9">src</a></code></dd> <dd><code title="attr-script-async"><a href= "#async">async</a></code></dd> <dd><code title="attr-script-defer"><a href= "#defer">defer</a></code></dd> <dd><code title="attr-script-type"><a href= "#type11">type</a></code></dd> <dd><code title="attr-script-charset"><a href= "#charset2"><ins class="diff-new">charset</ins></a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlscriptelement">HTMLScriptElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute DOMString <code title= "dom-script-src"><a href="#src10">src</a></code>; attribute boolean <code title= "dom-script-async"><a href="#async0">async</a></code>; attribute boolean <code title= "dom-script-defer"><a href="#defer0">defer</a></code>; attribute DOMString <code title= "dom-script-type"><a href="#type12">type</a></code>; <del class="diff-old"> attribute DOMString ; </del> <ins class="diff-chg"> attribute DOMString <code title= "dom-script-charset"><a href="#charset3">charset</a></code>; attribute DOMString <code title= "dom-script-text"><a href="#text1">text</a></code>; </ins> }; </pre></dd> </dl> The <code><a href="#script1">script</a></code> element allows authors to include dynamic script <ins class="diff-new">and script data</ins> in their documents. When <ins class="diff-new">used to include dynamic scripts,</ins> the <ins class="diff-chg">scripts may either be embedded inline or may be imported from an external file using the</ins> <code title="attr-script-src"><a href="#src9">src</a> <del class="diff-old">attribute</del></code> <ins class= "diff-chg">attribute. If the language</ins> is <del class= "diff-old">set,</del> <ins class="diff-chg">not that described by "</ins> <code title=""><ins class= "diff-chg">text/javascript</ins></code> <ins class="diff-chg">", then</ins> the <ins class="diff-chg">type of the script's language must be given using the</ins> <code title= "attr-script-type"><del class="diff-old">script</del> <a href= "#type11"><ins class="diff-chg">type</ins></a></code> <del class= "diff-old">element refers</del> <ins class= "diff-chg">attribute.</ins> <ins class="diff-chg">When used</ins> to <del class= "diff-old">an external file. The value</del> <ins class= "diff-chg">include script data, the script data must be embedded inline, the format</ins> of the <del class= "diff-old">attribute</del> <ins class="diff-chg">data</ins> must be <del class="diff-old">a URI (or IRI). If</del> <ins class= "diff-chg">given using the</ins> <code title= "attr-script-type"><a href="#type11"><ins class= "diff-chg">type</ins></a></code> <ins class="diff-chg">attribute, and</ins> the <code title="attr-script-src"><a href= "#src9">src</a></code> attribute <del class="diff-old">is</del> <ins class="diff-chg">must</ins> not <del class="diff-old">set, then</del> <ins class="diff-chg">be specified.</ins> <ins class="diff-chg">The</ins> <dfn id="type11" title= "attr-script-type"><code><ins class= "diff-chg">type</ins></code></dfn> <ins class="diff-chg">attribute gives</ins> the <del class="diff-old">script is given by</del> <ins class="diff-chg">language of</ins> the <del class= "diff-old">contents</del> <ins class="diff-chg">script or format</ins> of the <del class="diff-old">element.</del> <ins class="diff-chg">script data. If the attribute is present, its value must be a valid MIME type, optionally with parameters. The</ins> <code title=""><ins class="diff-chg">charset</ins></code> <ins class="diff-chg">parameter must not be specified. (The default, which is used if the attribute is absent, is "</ins> <code title=""><ins class="diff-chg">text/javascript</ins></code> <ins class="diff-chg">".)</ins> <a href="#references"><ins class= "diff-chg">[RFC2046]</ins></a> The <del class="diff-old">language</del> <dfn id="src9" title= "attr-script-src"><code><ins class= "diff-chg">src</ins></code></dfn> <ins class="diff-chg">attribute, if specified, gives the address</ins> of the <ins class= "diff-new">external</ins> script <del class="diff-old">may</del> <ins class="diff-chg">resource to use. The value of the attribute must</ins> be <ins class="diff-new">a URI (or IRI) to a script resource of the type</ins> given by the <code title= "attr-script-type"><a href="#type11"><ins class= "diff-chg">type</ins></a></code> <ins class="diff-chg">attribute, if the attribute is present, or of the</ins> type <ins class= "diff-new">"</ins> <code title=""><ins class= "diff-new">text/javascript</ins></code> <ins class="diff-new">", if the attribute is absent.</ins> <ins class="diff-new">The</ins> <dfn id="charset2" title= "attr-script-charset"><code><ins class= "diff-new">charset</ins></code></dfn> <del class= "diff-old">attribute.</del> <ins class="diff-chg">attribute gives the character encoding of the external script resource. The attribute must not be specified if the</ins> <code title= "attr-script-src"><a href="#src9"><ins class= "diff-chg">src</ins></a></code> <ins class="diff-chg">attribute is not present.</ins> If the attribute is <del class= "diff-old">present,</del> <ins class="diff-chg">set,</ins> its value must be a valid <del class="diff-old">MIME type, optionally with parameters.</del> <ins class="diff-chg">character encoding name, and must be the preferred name for that encoding.</ins> <a href="#references"><del class="diff-old">[RFC2046]</del> <ins class="diff-chg">[IANACHARSET]</ins></a> <ins class="diff-chg">The encoding specified must be the encoding used by the script resource. If the</ins> <code title= "attr-script-charset"><a href="#charset2"><ins class= "diff-chg">charset</ins></a></code> <ins class="diff-new">attribute is omitted, the character encoding of the document will be used. If the script resource uses a different encoding than the document, then the attribute must be specified.</ins> The <dfn id="async" title= "attr-script-async"><code>async</code></dfn> and <dfn id="defer" title="attr-script-defer"><code>defer</code></dfn> attributes are <a href="#boolean0" title="boolean attribute">boolean attributes</a> that indicate how the script should be executed. There are three possible modes that can be selected using these attributes. If the <code title="attr-script-async"><a href= "#async">async</a></code> attribute is present, then the script will be executed asynchronously, as soon as it is available. If the <code title="attr-script-async"><a href="#async">async</a></code> attribute is not present but the <code title= "attr-script-defer"><a href="#defer">defer</a></code> attribute is present, then the script is executed when the page has finished parsing. If neither attribute is present, then the script is downloaded and executed immediately, before the user agent continues parsing the page. The exact processing details for these attributes is described below. The <code title="attr-script-defer"><a href= "#defer">defer</a></code> attribute may be specified even if the <code title="attr-script-async"><a href="#async">async</a></code> attribute is specified, to cause legacy Web browsers that only support <code title="attr-script-defer"><a href= "#defer">defer</a></code> (and not <code title= "attr-script-async"><a href="#async">async</a></code> ) to fall back to the <code title="attr-script-defer"><a href= "#defer">defer</a></code> behavior instead of the synchronous blocking behavior that is the default. Changing the <code title="attr-script-src"><a href= "#src9">src</a></code> , <code title="attr-script-type"><a href= "#type11">type</a></code> , <code title= "attr-script-charset"><a href="#charset2"><ins class= "diff-new">charset</ins></a></code> , <code title= "attr-script-async"><a href="#async">async</a></code> , and <code title="attr-script-defer"><a href="#defer">defer</a></code> attributes dynamically has no direct effect; these attribute are only used at specific times described below (namely, when the element is inserted into the document). <code><a href="#script1">script</a></code> elements have <del class="diff-old">three</del> <ins class="diff-chg">four</ins> associated pieces of metadata. The first is a flag indicating whether or not the script block has been <dfn id="already">"already executed"</dfn> . Initially, <code><a href= "#script1">script</a></code> elements must have this flag unset (script blocks, when created, are not "already executed"). When a <code><a href="#script1">script</a></code> element is cloned, the "already executed" flag, if set, must be propagated to the clone when it is created. The second is a flag indicating whether the element was <dfn id="parser-inserted">"parser-inserted"</dfn> . This flag is set by the <a href="#html-0">HTML parser</a> and is used to handle <code title="dom-document-write-HTML"><a href= "#document.write...">document.write()</a></code> calls. The third <del class="diff-old">piece</del> <ins class="diff-chg">and fourth pieces</ins> of metadata <del class="diff-old">is</del> <ins class= "diff-chg">are</ins> <dfn id="the-scripts"><var>the script's type</var></dfn> <ins class="diff-new">and</ins> <dfn id= "the-scripts0"><var><ins class="diff-new">the script's character encoding</ins></var></dfn> . <del class="diff-old">It is</del> <ins class="diff-chg">They are</ins> determined when the script is run, based on the attributes on the element at that time. <dfn id="running" title="running a script">Running a script</dfn> : <del class="diff-old">when</del> <ins class= "diff-chg">When</ins> a script block is inserted into a document , the user agent must act as follows: <ol> <li> If the <code><a href="#script1">script</a></code> element has a <code title="attr-script-type"><a href="#type11">type</a></code> attribute <del class="diff-old">but</del> <ins class= "diff-chg">and</ins> its value is the empty string, or if the <code><a href="#script1">script</a></code> element has no <code title="attr-script-type"><a href="#type11">type</a></code> attribute but it has a <code title= "attr-script-language">language</code> <del class= "diff-old">attribute,</del> <ins class="diff-chg">attribute</ins> and that attribute's value is the empty string, <ins class="diff-new">or if the</ins> <code><a href= "#script1"><ins class="diff-new">script</ins></a></code> <ins class="diff-new">element has neither a</ins> <code title= "attr-script-type"><a href="#type11"><ins class= "diff-new">type</ins></a></code> <ins class="diff-new">attribute nor a</ins> <code title="attr-script-language"><ins class= "diff-new">language</ins></code> <ins class= "diff-new">attribute,</ins> let <var><a href="#the-scripts">the script's type</a></var> for this <code><a href= "#script1">script</a></code> element be " <code title= "">text/javascript</code> ". Otherwise, if the <code><a href="#script1">script</a></code> element has a <code title="attr-script-type"><a href= "#type11">type</a></code> attribute, let <var><a href= "#the-scripts">the script's type</a></var> for this <code><a href= "#script1">script</a></code> element be the value of that attribute. Otherwise, <del class="diff-old">if</del> the element has a <code title="attr-script-language">language</code> <del class= "diff-old">attribute,</del> <ins class="diff-chg">attribute;</ins> let <var><a href="#the-scripts">the script's type</a></var> for this <code><a href="#script1">script</a></code> element be the concatenation of the string " <code title="">text/</code> " followed by the value of the <code title= "attr-script-language">language</code> attribute. </li> <li> If <del class="diff-old">scripting is disabled , or if</del> the <code><del class="diff-old">Document</del> <a href= "#script1"><ins class="diff-chg">script</ins></a></code> <ins class="diff-new">element</ins> has <ins class= "diff-chg">a</ins> <code title="attr-script-charset"><del class= "diff-old">designMode</del> <a href="#charset2"><ins class= "diff-chg">charset</ins></a></code> <del class= "diff-old">enabled,</del> <ins class="diff-chg">attribute, then let</ins> <var><a href="#the-scripts0"><ins class="diff-chg">the script's character encoding</ins></a></var> <ins class= "diff-chg">for this</ins> <code><a href="#script1"><ins class= "diff-chg">script</ins></a></code> <ins class="diff-chg">element be the encoding given by the</ins> <code title= "attr-script-charset"><a href="#charset2"><ins class= "diff-chg">charset</ins></a></code> <ins class= "diff-chg">attribute.</ins> <ins class="diff-chg">Otherwise, let</ins> <var><a href= "#the-scripts0"><ins class="diff-chg">the script's character encoding</ins></a></var> <ins class="diff-chg">for this</ins> <code><a href="#script1"><ins class= "diff-chg">script</ins></a></code> <ins class="diff-chg">element be the same as</ins> <a href="#character1" title= "document's character encoding"><ins class="diff-chg">the encoding of the document itself</ins></a> . </li> <li> <ins class="diff-chg">If the</ins> <code><a href= "#script1"><ins class="diff-chg">script</ins></a></code> <ins class="diff-chg">element is</ins> <a href= "#without"><ins class="diff-chg">without script</ins></a> , or if the <code><a href="#script1">script</a></code> element was created by an XML parser that itself was created as part of the processing of the <code title="dom-innerHTML-XML"><a href= "#innerhtml1">innerHTML</a></code> attribute's setter , or if the user agent does not <a href="#support">support the scripting language</a> given by <var><a href="#the-scripts">the script's type</a></var> for this <code><a href="#script1">script</a></code> element, or if the <code><a href="#script1">script</a></code> element has its <a href="#already">"already executed"</a> flag set, then the user agent must abort these steps at this point. The script is not executed. </li> <li> The user agent must set the element's <a href= "#already">"already executed"</a> flag. </li> <li> If the element has a <code title="attr-script-src"><a href= "#src9">src</a></code> attribute, then a load for the specified content must be started. Later, once the load has completed, the user agent will have to complete <a href="#when-a" title= "when a script completes loading">the steps described below</a> . For performance reasons, user agents may start loading the script as soon as the attribute is set, instead, in the hope that the element will be inserted into the document. Either way, once the element is inserted into the document, the load must have started. If the UA performs such prefetching, but the element is never inserted in the document, or the <code title= "attr-script-src"><a href="#src9">src</a></code> attribute is dynamically changed, then the user agent will not execute the script, and the load will have been effectively wasted. </li> <li> Then, the first of the following options that describes the situation must be followed: <dl class="switch"> <dt>If the document is still being parsed, and the element has a <code title="attr-script-defer"><a href="#defer">defer</a></code> attribute, and the element does not have an <code title= "attr-script-async"><a href="#async">async</a></code> attribute</dt> <dd>The element must be added to the end of the <a href= "#list-of">list of scripts that will execute when the document has finished parsing</a> . The user agent must begin <a href="#when-a" title="when a script completes loading">the next set of steps</a> when the script is ready. This isn't compatible with IE for inline deferred scripts, but then what IE does is pretty hard to pin down exactly. Do we want to keep this like it is? Be more compatible?</dd> <dt>If the element has an <code title="attr-script-async"><a href= "#async">async</a></code> attribute and a <code title= "attr-script-src"><a href="#src9">src</a></code> attribute</dt> <dd>The element must be added to the end of the <a href= "#list-of0">list of scripts that will execute asynchronously</a> . The user agent must jump to <a href="#when-a" title= "when a script completes loading">the next set of steps</a> once the script is ready.</dd> <dt>If the element has an <code title="attr-script-async"><a href= "#async">async</a></code> attribute but no <code title= "attr-script-src"><a href="#src9">src</a></code> attribute, and the <a href="#list-of0">list of scripts that will execute asynchronously</a> is not empty</dt> <dd>The element must be added to the end of the <a href= "#list-of0">list of scripts that will execute asynchronously</a> .</dd> <dt>If the element has a <code title="attr-script-src"><a href= "#src9">src</a></code> attribute and has been flagged as <a href= "#parser-inserted">"parser-inserted"</a></dt> <dd>The element is <a href="#the-script">the script that will execute as soon as the parser resumes</a> . (There can only be one such script at a time.)</dd> <dt>If the element has a <code title="attr-script-src"><a href= "#src9">src</a></code> attribute</dt> <dd>The element must be added to the end of the <a href= "#list-of1">list of scripts that will execute as soon as possible</a> . The user agent must jump to <a href="#when-a" title= "when a script completes loading">the next set of steps</a> when the script is ready.</dd> <dt>Otherwise</dt> <dd>The user agent must immediately <a href="#executing0" title= "executing a script block">execute the script</a> , even if other scripts are already executing.</dd> </dl> </li> </ol> <dfn id="when-a" title="when a script completes loading">When a script completes loading</dfn> : If a script whose element was added to one of the lists mentioned above completes loading while the document is still being parsed, then the parser handles it. Otherwise, when a script completes loading, the UA must run the following steps as soon as as any other scripts that may be executing have finished executing: <dl class="switch"> <dt>If the script's element was added to the <dfn id="list-of">list of scripts that will execute when the document has finished parsing</dfn> :</dt> <dd> <ol> <li> If the script's element is not the first element in the list, then do nothing yet. Stop going through these steps. </li> <li> Otherwise, <a href="#executing0" title= "executing a script block">execute the script</a> (that is, the script associated with the first element in the list). </li> <li> Remove the script's element from the list (i.e. shift out the first entry in the list). </li> <li> If there are any more entries in the list, and if the script associated with the element that is now the first in the list is already loaded, then jump back to step two to execute it. </li> </ol> </dd> <dt>If the script's element was added to the <dfn id= "list-of0">list of scripts that will execute asynchronously</dfn> :</dt> <dd> <ol> <li> If the script is not the first element in the list, then do nothing yet. Stop going through these steps. </li> <li> <a href="#executing0" title="executing a script block">Execute the script</a> (the script associated with the first element in the list). </li> <li> Remove the script's element from the list (i.e. shift out the first entry in the list). </li> <li> If there are any more scripts in the list, and the element now at the head of the list had no <code title= "attr-script-src"><a href="#src9">src</a></code> attribute when it was added to the list, or had one, but its associated script has finished loading, then jump back to step two to execute the script associated with this element. </li> </ol> </dd> <dt>If the script's element was added to the <dfn id= "list-of1">list of scripts that will execute as soon as possible</dfn> :</dt> <dd> <ol> <li> <a href="#executing0" title="executing a script block">Execute the script</a> . </li> <li> Remove the script's element from the list. </li> </ol> </dd> <dt>If the script is <dfn id="the-script">the script that will execute as soon as the parser resumes</dfn> :</dt> <dd> The script will be handled <a href= "#scriptTagParserResumes">when the parser resumes</a> (amazingly enough). </dd> </dl> The download of an external script must <a href="#delays">delay the <code title="event-load">load</code> event</a> . <dfn id="executing0" title="executing a script block">Executing a script block</dfn> : <ins class="diff-new">When the steps above require that the script be executed, the user agent must act as follows:</ins> <dl class="switch"> <dt>If the load resulted in an error (for example a DNS error, or an HTTP 404 <del class="diff-old">error), then executing</del> <ins class="diff-chg">error)</ins></dt> <dd> <ins class="diff-chg">Executing</ins> the script must just consist of <a href="#firing5" title="fire an error event">firing an <code title="event-error">error</code> event</a> at the element. </dd> <dt>If the load was <del class="diff-old">successful, then first the user agent must fire a load event at the element, and then, if scripting is enabled , and</del> <ins class= "diff-chg">successful</ins></dt> <dd> <ol> <li> <ins class="diff-chg">If</ins> the <code><del class= "diff-old">Document does not have</del> <del class= "diff-old">designMode</del> <a href="#script1"><ins class= "diff-chg">script</ins></a></code> <del class="diff-old">enabled, and the</del> <ins class="diff-chg">element's</ins> <code>Document</code> is the <a href="#active">active document</a> in its <a href="#browsing1">browsing context</a> , the user agent must execute the script: <dl class="switch"> <dt>If the script is from an external <del class="diff-old">file, then that</del> <ins class="diff-chg">file</ins></dt> <dd> <ins class="diff-chg">That</ins> file must be used as the file to execute. <ins class="diff-new">The file must be interpreted using the character encoding given by</ins> <var><a href= "#the-scripts0"><ins class="diff-new">the script's character encoding</ins></a></var> ,<ins class="diff-new">regardless of any metadata given by the file's</ins> <a href="#content-type8" title= "Content-Type"><ins class="diff-new">Content-Type metadata</ins></a> . <ins class="diff-new">This means that a UTF-16 document will always assume external scripts are UTF-16...? This applies, e.g., to document's created using createDocument()... It also means changing document.charSet will affect the character encoding used to interpret scripts, is that really what happens?</ins> </dd> <dt>If the script is <del class="diff-old">inline, then, for</del> <ins class="diff-chg">inline</ins></dt> <dd> <ins class="diff-chg">For</ins> scripting languages that consist of pure text, user agents must use the value of the DOM <code title="dom-script-text"><a href="#text1">text</a></code> attribute (defined below) as the script to execute, and for XML-based scripting languages, user agents must use all the child nodes of the <code><a href="#script1">script</a></code> element as the script to execute. </dd> </dl> In any case, the user agent must execute the script according to the semantics defined by the language associated with <var><a href= "#the-scripts">the script's type</a></var> (see the <a href= "#scriptingLanguages">scripting languages</a> section below). <del class="diff-old">Scripts</del> <ins class= "diff-chg">The</ins> <a href="#script2"><ins class= "diff-chg">script execution context</ins></a> <ins class= "diff-chg">of the script</ins> must be <del class= "diff-old">executed in</del> the <del class="diff-old">scope</del> <code><a href="#window"><ins class= "diff-chg">Window</ins></a></code> <ins class= "diff-chg">object</ins> of <del class="diff-old">the</del> <ins class="diff-chg">that</ins> <a href="#browsing1">browsing context <del class="diff-old">of the element's Document .</del></a> . The element's attributes' values might have changed between when the element was inserted into the document and when the script has finished loading, as may its other attributes; similarly, the element itself might have been taken back out of the DOM, or had other changes made. These changes do not in any way affect the above steps; only the values of the attributes at the time the <code><a href="#script1">script</a></code> element is first inserted into the document matter. </li> <li> <ins class="diff-new">Then, the user agent must</ins> <a href= "#firing4"><ins class="diff-new">fire a</ins> <code title= "event-load"><ins class="diff-new">load</ins></code> <ins class= "diff-new">event</ins></a> <ins class="diff-new">at the</ins> <code><a href="#script1"><ins class= "diff-new">script</ins></a></code> <ins class= "diff-new">element.</ins> </li> </ol> </dd> </dl> The DOM attributes <dfn id="src10" title= "dom-script-src"><code>src</code></dfn> , <dfn id="type12" title= "dom-script-type"><code>type</code></dfn> , <dfn id="charset3" title="dom-script-charset"><code><ins class= "diff-new">charset</ins></code></dfn> , <dfn id="async0" title= "dom-script-async"><code>async</code></dfn> , and <dfn id="defer0" title="dom-script-defer"><code>defer</code></dfn> , each must <a href="#reflect">reflect</a> the respective content attributes of the same name. The DOM attribute <dfn id="text1" title= "dom-script-text"><code>text</code></dfn> must return a concatenation of the contents of all the <a href="#text-node" title="text node">text nodes</a> that are direct children of the <code><a href="#script1">script</a></code> element (ignoring any other nodes such as comments or elements), in tree order. On setting, it must act the same way as the <code><a href= "#textcontent">textContent</a></code> DOM attribute. <h5 id="scriptingLanguages"><del class= "diff-old">3.17.1.1.</del> <ins class= "diff-chg">3.15.1.1.</ins> Scripting languages</h5> A user agent is said to <dfn id="support">support the scripting language</dfn> if <var><a href="#the-scripts">the script's type</a></var> matches the MIME type of a scripting language that the user agent implements. The following lists some MIME types and the languages to which they refer: <dl> <dt><code>text/javascript</code></dt> <dd>ECMAScript. <a href="#references">[ECMA262]</a></dd> <dt><code>text/javascript;e4x=1</code></dt> <dd>ECMAScript with ECMAScript for XML. <a href= "#references">[ECMA357]</a></dd> </dl> User agents may support other MIME types and other languages. When examining types to determine if they support the language, user agents must not ignore unknown MIME parameters — types with unknown parameters must be assumed to be unsupported. <h4 id="the-noscript"><del class= "diff-old">3.17.2.</del> <ins class="diff-chg">3.15.2</ins> The <dfn id="noscript"><code>noscript</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#metadata0">Metadata content</a> .</dd> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>In a <code><a href="#head">head</a></code> element of an <a href="#html-" title="> HTML documents">HTML document</a> , if there are no ancestor <code><a href="#noscript">noscript</a></code> elements.</dd> <dd>Where <a href="#phrasing0">phrasing content</a> is expected in <a href="#html-">HTML documents</a> , if there are no ancestor <code><a href="#noscript">noscript</a></code> elements.</dd> <dt>Content model:</dt> <dd><del class="diff-old">When scripting is disabled</del> <a href= "#without"><ins class="diff-chg">Without script</ins></a> , in a <code><a href="#head">head</a></code> element: in any order, zero or more <code><a href="#link">link</a></code> elements, zero or more <code><a href="#style1">style</a></code> elements, and zero or more <code><a href="#meta0">meta</a></code> elements.</dd> <dd><del class="diff-old">When scripting is disabled</del> <a href= "#without"><ins class="diff-chg">Without script</ins></a> , not in a <code><a href="#head">head</a></code> element: <a href= "#transparent0">transparent</a> , but there must be no <code><a href="#noscript">noscript</a></code> element descendants.</dd> <dd><del class="diff-old">When scripting is enabled</del> <a href= "#with-script"><ins class="diff-chg">With script</ins></a> : text that conforms to the requirements given in the prose.</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#noscript">noscript</a></code> element does not represent anything. It is used to present different markup to user agents that support scripting and those that don't support scripting, by affecting how the document is parsed. The <code><a href="#noscript">noscript</a></code> element must not be used in <a href="#xml-documents">XML documents</a> . <ins class="diff-new">The</ins> <code><a href="#noscript"><ins class= "diff-new">noscript</ins></a></code> <ins class="diff-new">element is only effective in the</ins> <ins class= "diff-new">HTML serialization</ins> <ins class="diff-new">, it has no effect in the</ins> <ins class= "diff-new">XML serialization</ins> . When used in <a href="#html-">HTML documents</a> , the allowed content model <del class="diff-old">depends on whether scripting</del> is <del class="diff-old">enabled or not, and whether the element is in</del> <ins class="diff-chg">as follows:</ins> <ins class="diff-chg">In</ins> a <code><a href= "#head">head</a></code> <del class="diff-old">element or not. In a</del> <ins class="diff-chg">element, if the</ins> <code><del class="diff-old">head</del> <a href= "#noscript"><ins class="diff-chg">noscript</ins></a></code> <del class="diff-old">element, if scripting</del> <ins class= "diff-chg">element</ins> is <del class="diff-old">disabled</del> <a href="#without"><ins class="diff-chg">without script</ins></a> , then the content model of a <code><a href= "#noscript">noscript</a></code> element must contain only <code><a href="#link">link</a></code> , <code><a href= "#style1">style</a></code> , and <code><a href= "#meta0">meta</a></code> elements. If <del class= "diff-old">scripting</del> <ins class="diff-chg">the</ins> <code><a href="#noscript"><ins class= "diff-chg">noscript</ins></a></code> <ins class= "diff-chg">element</ins> is <del class="diff-old">enabled</del> <a href="#with-script"><ins class="diff-chg">with script</ins></a> , then the content model of a <code><a href= "#noscript">noscript</a></code> element is text, except that invoking the <a href="#html-fragment0">HTML fragment parsing algorithm</a> with the <code><a href= "#noscript">noscript</a></code> element as the <var title= "">context</var> <ins class="diff-new">element</ins> and the text contents as the <var title="">input</var> must result in a list of nodes that consists only of <code><a href="#link">link</a></code> , <code><a href="#style1">style</a></code> , and <code><a href= "#meta0">meta</a></code> elements. Outside of <code><a href="#head">head</a></code> elements, if <del class="diff-old">scripting</del> <ins class= "diff-chg">the</ins> <code><a href="#noscript"><ins class= "diff-chg">noscript</ins></a></code> <ins class= "diff-chg">element</ins> is <del class="diff-old">disabled</del> <a href="#without"><ins class="diff-chg">without script</ins></a> , then the content model of a <code><a href= "#noscript">noscript</a></code> element is <a href= "#transparent0">transparent</a> , with the additional restriction that a <code><a href="#noscript">noscript</a></code> element must not have a <code><a href="#noscript">noscript</a></code> element as an ancestor (that is, <code><a href="#noscript">noscript</a></code> can't be nested). Outside of <code><a href="#head">head</a></code> elements, if <del class="diff-old">scripting</del> <ins class= "diff-chg">the</ins> <code><a href="#noscript"><ins class= "diff-chg">noscript</ins></a></code> <ins class= "diff-chg">element</ins> is <del class="diff-old">enabled</del> <a href="#with-script"><ins class="diff-chg">with script</ins></a> , then the content model of a <code><a href= "#noscript">noscript</a></code> element is text, except that the text must be such that running the following algorithm results in a conforming document with no <code><a href= "#noscript">noscript</a></code> elements and no <code><a href= "#script1">script</a></code> elements, and such that no step in the algorithm causes an <a href="#html-0">HTML parser</a> to flag a <a href="#parse1">parse error</a> : <ol> <li>Remove every <code><a href="#script1">script</a></code> element from the document.</li> <li>Make a list of every <code><a href= "#noscript">noscript</a></code> element in the document. For every <code><a href="#noscript">noscript</a></code> element in that list, perform the following steps: <ol> <li>Let the <var title="">parent element</var> be the parent element of the <code><a href="#noscript">noscript</a></code> element.</li> <li>Take all the children of the <var title="">parent element</var> that come before the <code><a href="#noscript">noscript</a></code> element, and call these elements <var title="">the before children</var> .</li> <li>Take all the children of the <var title="">parent element</var> that come after the <code><a href= "#noscript">noscript</a></code> element, and call these elements <var title="">the after children</var> .</li> <li>Let <var title="">s</var> be the concatenation of all the <a href="#text-node">text node</a> children of the <code><a href= "#noscript">noscript</a></code> element.</li> <li>Set the <code title="dom-innerHTML-HTML"><a href= "#innerhtml0">innerHTML</a></code> attribute of the <var title= "">parent element</var> to the value of <var title="">s</var> . (This, as a side-effect, causes the <code><a href= "#noscript">noscript</a></code> element to be removed from the document.)</li> <li>Insert <var title="">the before children</var> at the start of the <var title="">parent element</var> , preserving their original relative order.</li> <li>Insert <var title="">the after children</var> at the end of the <var title="">parent element</var> , preserving their original relative order.</li> </ol> </li> </ol> The <code><a href="#noscript">noscript</a></code> element has no other requirements. In particular, children of the <code><a href= "#noscript">noscript</a></code> element are not exempt from form submission, scripting, and so forth, even when <del class= "diff-old">scripting</del> <ins class="diff-chg">the element</ins> is <del class="diff-old">enabled.</del> <a href= "#with-script"><ins class="diff-chg">with script</ins></a> . All these contortions are required because, for historical reasons, the <code><a href= "#noscript">noscript</a></code> element <del class= "diff-old">causes</del> <ins class="diff-chg">is handled differently by</ins> the <a href="#html-0">HTML parser</a> <del class="diff-old">to act differently</del> based on whether <a href="#scripting2" title="scripting flag">scripting <del class= "diff-old">is</del> <ins class="diff-chg">was</ins> enabled or <del class="diff-old">not.</del> <ins class= "diff-chg">not</ins></a> <ins class="diff-chg">when the parser was invoked.</ins> The element is not allowed in XML, because in XML the parser is not affected by such state, and thus the element would not have the desired effect. <ins class="diff-new">The</ins> <code><a href= "#noscript"><ins class="diff-new">noscript</ins></a></code> <ins class="diff-new">element interacts poorly with the</ins> <code title="dom-document-designMode"><a href= "#designMode"><ins class="diff-new">designMode</ins></a></code> <ins class="diff-new">feature. Authors are encouraged to not use</ins> <code><a href="#noscript"><ins class= "diff-new">noscript</ins></a></code> <ins class="diff-new">elements on pages that will have</ins> <code title= "dom-document-designMode"><a href="#designMode"><ins class= "diff-new">designMode</ins></a></code> <ins class= "diff-new">enabled.</ins> <h4 id="the-event-source"><del class= "diff-old">3.17.3.</del> <ins class="diff-chg">3.15.3</ins> The <dfn id="event-source"><code>event-source</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#metadata0">Metadata content</a> .</dd> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#metadata0">metadata content</a> is expected.</dd> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd>Empty.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-event-source-src"><a href= "#src11">src</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmleventsourceelement">HTMLEventSourceElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute DOMString <a href="#src12" title= "dom-event-source-src">src</a>; }; </pre></dd> </dl> The <code><a href="#event-source">event-source</a></code> element represents a target for events generated by a remote server. The <dfn id="src11" title= "attr-event-source-src"><code>src</code></dfn> attribute, if specified, must give a URI (or IRI) pointing to a resource that uses the <code><del class= "diff-old">application/x-dom-event-stream</del> <ins class= "diff-chg">text/event-stream</ins></code> format. When the element is inserted into the document, if it has the <code title="attr-event-source-src"><a href="#src11">src</a></code> attribute specified, the user agent must act as if the <code title= "dom-remoteEventTarget-addEventSource"><a href= "#addeventsource">addEventSource()</a></code> method on the <code><a href="#event-source">event-source</a></code> element had been invoked with the URI resulting from resolving the <code title= "attr-event-source-src"><a href="#src11">src</a></code> attribute's value to an absolute URI. While the element is in a document, if its <code title= "attr-event-source-src"><a href="#src11">src</a></code> attribute is mutated, the user agent must act as if first the <code title= "dom-remoteEventTarget-removeEventSource"><a href= "#removeeventsource">removeEventSource()</a></code> method on the <code><a href="#event-source">event-source</a></code> element had been invoked with the URI resulting from resolving the old value of the attribute to an absolute URI, and then as if the <code title= "dom-remoteEventTarget-addEventSource"><a href= "#addeventsource">addEventSource()</a></code> method on the element had been invoked with the URI resulting from resolving the new value of the <code title= "attr-event-source-src"><a href="#src11">src</a></code> attribute to an absolute URI. When the element is removed from the document, if it has the <code title="attr-event-source-src"><a href="#src11">src</a></code> attribute specified, or, when the <code title= "attr-event-source-src"><a href="#src11">src</a></code> attribute is about to be removed, the user agent must act as if the <code title="dom-remoteEventTarget-removeEventSource"><a href= "#removeeventsource">removeEventSource()</a></code> method on the <code><a href="#event-source">event-source</a></code> element had been invoked with the URI resulting from resolving the <code title= "attr-event-source-src"><a href="#src11">src</a></code> attribute's value to an absolute URI. There can be more than one <code><a href= "#event-source">event-source</a></code> element per document, but authors should take care to avoid opening multiple connections to the same server as HTTP recommends a limit to the number of simultaneous connections that a user agent can open per server. The <dfn id="src12" title= "dom-event-source-src"><code>src</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the content attribute of the same name. <h3 id="interactive-elements"><del class= "diff-old">3.18.</del> <ins class="diff-chg">3.16</ins> Interactive elements</h3> <h4 id="the-details"><del class= "diff-old">3.18.1.</del> <ins class="diff-chg">3.16.1</ins> The <dfn id="details"><code>details</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <ins class= "diff-chg">Flow</ins> element .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd>One <code><a href="#legend">legend</a></code> element followed by <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-details-open"><a href= "#open0">open</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmldetailselement">HTMLDetailsElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { <del class="diff-old"> attribute boolean ; </del> <ins class="diff-chg"> attribute boolean <a href="#open1" title="dom-details-open">open</a>; </ins> }; </pre></dd> </dl> The <code><a href="#details">details</a></code> element represents additional information or controls which the user can obtain on demand. The first element child of a <code><a href= "#details">details</a></code> element, if it is a <code><a href= "#legend">legend</a></code> element, represents the summary of the details. If the first element is not a <code><a href= "#legend">legend</a></code> element, the UA should provide its own legend (e.g. "Details"). The <dfn id="open0" title= "attr-details-open"><code>open</code></dfn> content attribute is a <a href="#boolean0">boolean attribute</a> . If present, it indicates that the details should be shown to the user. If the attribute is absent, the details should not be shown. If the attribute is removed, then the details should be hidden. If the attribute is added, the details should be shown. The user should be able to request that the details be shown or hidden. The <dfn id="open1" title= "dom-details-open"><code>open</code></dfn> attribute must <a href= "#reflect">reflect</a> the <code title="attr-details-open"><a href= "#open0">open</a></code> content attribute. Rendering will be described in the Rendering section in due course. Basically CSS :open and :closed match the element, it's a block-level element by default, and when it matches :closed it renders as if it had an XBL binding attached to it whose template was just <code><template> ▶<content includes="legend:first-child">Details</content> </template></code> , and when it's :open it acts as if it had an XBL binding attached to it whose template was just <code><template> ▼<content includes="legend:first-child">Details</content> <content/> </template></code> or some such. Clicking the legend would make it open/close (and would change the content attribute). Question: Do we want the content attribute to reflect the actual state like this? I think we do, the DOM not reflecting state has been a pain in the neck before. But is it semantically ok? <h4 id="datagrid"><del class= "diff-old">3.18.2.</del> <ins class="diff-chg">3.16.2</ins> The <dfn id="datagrid0"><code>datagrid</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <ins class= "diff-chg">Flow</ins> element .</dd> <dd>Interactive element .</dd> <dd><a href="#sectioning1"><ins class="diff-new">Sectioning root</ins></a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd>Either: Nothing.</dd> <dd>Or: <del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> , but where the first element child node, if any, is not a <code><a href= "#table">table</a></code> , <code><ins class= "diff-new">select</ins></code> ,<ins class="diff-new">or</ins> <code><ins class="diff-new">datalist</ins></code> element.</dd> <dd>Or: A single <code><a href="#table">table</a></code> element.</dd> <dd>Or: A single <code>select</code> element.</dd> <dd>Or: A single <code>datalist</code> element.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-datagrid-multiple"><a href= "#multiple0">multiple</a></code></dd> <dd><code title="attr-datagrid-disabled"><a href= "#disabled3">disabled</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmldatagridelement">HTMLDataGridElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute <a href= "#datagriddataprovider">DataGridDataProvider</a> <a href="#data2" title="dom-datagrid-data">data</a>; readonly attribute <a href= "#datagridselection">DataGridSelection</a> <a href="#selection0" title="dom-datagrid-selection">selection</a>; attribute boolean <a href="#multiple" title= "dom-datagrid-multiple">multiple</a>; attribute boolean <a href="#disabled2" title= "dom-datagrid-disabled">disabled</a>; void <a href="#updateeverything" title= "dom-datagrid-updateEverything">updateEverything</a>(); void <a href="#updaterowschanged" title= "dom-datagrid-updateRowsChanged">updateRowsChanged</a>(in <a href= "#rowspecification">RowSpecification</a> row, in unsigned long count); void <a href="#updaterowsinserted" title= "dom-datagrid-updateRowsInserted">updateRowsInserted</a>(in <a href="#rowspecification">RowSpecification</a> row, in unsigned long count); void <a href="#updaterowsremoved" title= "dom-datagrid-updateRowsRemoved">updateRowsRemoved</a>(in <a href= "#rowspecification">RowSpecification</a> row, in unsigned long count); void <a href="#updaterowchanged" title= "dom-datagrid-updateRowChanged">updateRowChanged</a>(in <a href= "#rowspecification">RowSpecification</a> row); void <a href="#updatecolumnchanged" title= "dom-datagrid-updateColumnChanged">updateColumnChanged</a>(in unsigned long column); void <a href="#updatecellchanged" title= "dom-datagrid-updateCellChanged">updateCellChanged</a>(in <a href= "#rowspecification">RowSpecification</a> row, in unsigned long column); }; </pre></dd> </dl> One possible thing to be added is a way to detect when a row/selection has been deleted, activated, etc, by the user (delete key, enter key, etc). This element is defined as interactive, which means it can't contain other interactive elements, despite the fact that we expect it to work with other interactive elements e.g. checkboxes and input fields. It should be called something like a Leaf Interactive Element or something, which counts for ancestors looking in and not descendants looking out. The <code><a href="#datagrid0">datagrid</a></code> element represents an interactive representation of tree, list, or tabular data. The data being presented can come either from the content, as elements given as children of the <code><a href= "#datagrid0">datagrid</a></code> element, or from a scripted data provider given by the <code title="dom-datagrid-data"><a href= "#data2">data</a></code> DOM attribute. The <code title="attr-datagrid-multiple"><a href= "#multiple0">multiple</a></code> and <code title= "attr-datagrid-disabled"><a href="#disabled3">disabled</a></code> attributes are <a href="#boolean0" title= "boolean attribute">boolean attributes</a> . Their effects are described in the processing model sections below. The <dfn id="multiple" title= "dom-datagrid-multiple"><code>multiple</code></dfn> and <dfn id= "disabled2" title= "dom-datagrid-disabled"><code>disabled</code></dfn> DOM attributes must <a href="#reflect">reflect</a> the <code title= "attr-datagrid-multiple"><a href="#multiple0">multiple</a></code> and <code title="attr-datagrid-disabled"><a href= "#disabled3">disabled</a></code> content attributes respectively. <h5 id="the-datagrid"><del class= "diff-old">3.18.2.1.</del> <ins class= "diff-chg">3.16.2.1.</ins> The <code><a href= "#datagrid0">datagrid</a></code> data model</h5> This section is non-normative. In the <code><a href="#datagrid0">datagrid</a></code> data model, data is structured as a set of rows representing a tree, each row being split into a number of columns. The columns are always present in the data model, although individual columns may be hidden in the presentation. Each row can have child rows. Child rows may be hidden or shown, by closing or opening (respectively) the parent row. Rows are referred to by the path along the tree that one would take to reach the row, using zero-based indices. Thus, the first row of a list is row "0", the second row is row "1"; the first child row of the first row is row "0,0", the second child row of the first row is row "0,1"; the fourth child of the seventh child of the third child of the tenth row is "9,2,6,3", etc. The columns can have captions. Those captions are not considered a row in their own right, they are obtained separately. Selection of data in a <code><a href= "#datagrid0">datagrid</a></code> operates at the row level. If the <code title="attr-datagrid-multiple"><a href= "#multiple0">multiple</a></code> attribute is present, multiple rows can be selected at once, otherwise the user can only select one row at a time. The <code><a href="#datagrid0">datagrid</a></code> element can be disabled entirely by setting the <code title= "attr-datagrid-disabled"><a href="#disabled3">disabled</a></code> attribute. Columns, rows, and cells can each have specific flags, known as classes, applied to them by the data provider. These classes <a href="#datagridClassSummary">affect the functionality</a> of the <code><a href="#datagrid0">datagrid</a></code> element, and are also <a href="#datagridPseudos">passed to the style system</a> . They are similar in concept to the <code title= "attr-class"><a href="#class">class</a></code> attribute, except that they are not specified on elements but are given by scripted data providers. <h5 id="how-rows"><del class= "diff-old">3.18.2.2.</del> <ins class= "diff-chg">3.16.2.2.</ins> How rows are identified</h5> The chains of numbers that give a row's path, or identifier, are represented by objects that implement the <a href= "#rowspecification">RowSpecification</a> interface. <del class= "diff-old">{</del> <pre> <ins class= "diff-chg"> class=idl>[NoInterfaceObject] interface <dfn id= "rowspecification">RowSpecification</dfn> { </ins> // binding-specific interface }; </pre> In ECMAScript, two classes of objects are said to implement this interface: Numbers representing non-negative integers, and homogeneous arrays of Numbers representing non-negative integers. Thus, <code>[1,0,9]</code> is a <a href= "#rowspecification">RowSpecification</a> , as is <code>1</code> on its own. However, <code>[1,0.2,9]</code> is not a <a href= "#rowspecification">RowSpecification</a> object, since its second value is not an integer. User agents must always represent <code><a href= "#rowspecification">RowSpecification</a></code> s in ECMAScript by using arrays, even if the path only has one number. The root of the tree is represented by the empty path; in ECMAScript, this is the empty array ( <code>[]</code> ). Only the <code title="dom-provider-getRowCount"><a href= "#getrowcount">getRowCount()</a></code> and <code title= "dom-provider-getChildAtPosition"><a href= "#getchildatposition">GetChildAtPosition()</a></code> methods ever get called with the empty path. <h5 id="the-data"><del class= "diff-old">3.18.2.3.</del> <ins class= "diff-chg">3.16.2.3.</ins> The data provider interface</h5> The conformance criteria in this section apply to any implementation of the <code><a href= "#datagriddataprovider">DataGridDataProvider</a></code> , including (and most commonly) the content author's implementation(s). <pre class="idl"> // To be implemented by Web authors as a JS object <del class="diff-old">interface { </del> <ins class="diff-chg">[NoInterfaceObject] interface <dfn id= "datagriddataprovider">DataGridDataProvider</dfn> { </ins> void <a href="#initialize" title= "dom-provider-initialize">initialize</a>(in HTMLDataGridElement datagrid); unsigned long <a href="#getrowcount" title= "dom-provider-getRowCount">getRowCount</a>(in <a href= "#rowspecification">RowSpecification</a> row); unsigned long <a href="#getchildatposition" title= "dom-provider-getChildAtPosition">getChildAtPosition</a>(in <a href="#rowspecification">RowSpecification</a> parentRow, in unsigned long position); unsigned long <a href="#getcolumncount" title= "dom-provider-getColumnCount">getColumnCount</a>(); DOMString <a href="#getcaptiontext" title= "dom-provider-getCaptionText">getCaptionText</a>(in unsigned long column); void <a href="#getcaptionclasses" title= "dom-provider-getCaptionClasses">getCaptionClasses</a>(in unsigned long column, in DOMTokenList classes); DOMString <a href="#getrowimage" title= "dom-provider-getRowImage">getRowImage</a>(in <a href= "#rowspecification">RowSpecification</a> row); <a href="#htmlmenuelement">HTMLMenuElement</a> <a href= "#getrowmenu" title= "dom-provider-getRowMenu">getRowMenu</a>(in <a href= "#rowspecification">RowSpecification</a> row); void <a href="#getrowclasses" title= "dom-provider-getRowClasses">getRowClasses</a>(in <a href= "#rowspecification">RowSpecification</a> row, in DOMTokenList classes); DOMString <a href="#getcelldata" title= "dom-provider-getCellData">getCellData</a>(in <a href= "#rowspecification">RowSpecification</a> row, in unsigned long column); void <a href="#getcellclasses" title= "dom-provider-getCellClasses">getCellClasses</a>(in <a href= "#rowspecification">RowSpecification</a> row, in unsigned long column, in DOMTokenList classes); void <a href="#togglecolumnsortstate" title= "dom-provider-toggleColumnSortState">toggleColumnSortState</a>(in unsigned long column); void <a href="#setcellcheckedstate" title= "dom-provider-setCellCheckedState">setCellCheckedState</a>(in <a href="#rowspecification">RowSpecification</a> row, in unsigned long column, in long state); void <a href="#cyclecell" title= "dom-provider-cycleCell">cycleCell</a>(in <a href= "#rowspecification">RowSpecification</a> row, in unsigned long column); void <a href="#editcell" title= "dom-provider-editCell">editCell</a>(in <a href= "#rowspecification">RowSpecification</a> row, in unsigned long column, in DOMString data); }; </pre> The <code><a href= "#datagriddataprovider">DataGridDataProvider</a></code> interface represents the interface that objects must implement to be used as custom data views for <code><a href= "#datagrid0">datagrid</a></code> elements. Not all the methods are required. The minimum number of methods that must be implemented in a useful view is two: the <code title= "dom-provider-getRowCount"><a href= "#getrowcount">getRowCount()</a></code> and <code title= "dom-provider-getCellData"><a href= "#getcelldata">getCellData()</a></code> methods. Once the object is written, it must be hooked up to the <code><a href="#datagrid0">datagrid</a></code> using the <dfn id= "data2" title="dom-datagrid-data"><code>data</code></dfn> DOM attribute. The following methods may be usefully implemented: <dl> <dt><dfn id="initialize" title= "dom-provider-initialize"><code>initialize( <var title= "">datagrid</var> )</code></dfn></dt> <dd>Called by the <code><a href="#datagrid0">datagrid</a></code> element (the one given by the <var title="">datagrid</var> argument) after it has first populated itself. This would typically be used to set the initial selection of the <code><a href= "#datagrid0">datagrid</a></code> element when it is first loaded. The data provider could also use this method call to register a <code title="event-select"><a href="#select">select</a></code> event handler on the <code><a href="#datagrid0">datagrid</a></code> in order to monitor selection changes.</dd> <dt><dfn id="getrowcount" title= "dom-provider-getRowCount"><code>getRowCount( <var title= "">row</var> )</code></dfn></dt> <dd>Must return the number of rows that are children of the specified <var title="">row</var> , including rows that are off-screen. If <var title="">row</var> is empty, then the number of rows at the top level must be returned. If the value that this method would return for a given <var title="">row</var> changes, the relevant update methods on the <code><a href= "#datagrid0">datagrid</a></code> must be called first. Otherwise, this method must always return the same number. For a list (as opposed to a tree), this method must return 0 whenever it is called with a <var title="">row</var> identifier that is not empty.</dd> <dt><dfn id="getchildatposition" title= "dom-provider-getChildAtPosition"><code>getChildAtPosition( <var title="">parentRow</var> , <var title="">position</var> )</code></dfn></dt> <dd>Must return the index of the row that is a child of <var title= "">parentRow</var> and that is to be positioned as the <var title= "">position</var> th row under <var title="">parentRow</var> when rendering the children of <var title="">parentRow</var> . If <var title="">parentRow</var> is empty, then <var title= "">position</var> refers to the <var title="">position</var> th row at the top level of the data grid. May be omitted if the rows are always to be sorted in the natural order. (The natural order is the one where the method always returns <var title="">position</var> .) For a given <var title="">parentRow</var> , this method must never return the same value for different values of <var title= "">position</var> . The returned value <var title="">x</var> must be in the range 0 ≤  <var title="">x</var>  <  <var title="">n</var> , where <var title= "">n</var> is the value returned by <code title= "dom-provider-getRowCount"><a href="#getrowcount">getRowCount( <var title="">parentRow</var> )</a></code> .</dd> <dt><dfn id="getcolumncount" title= "dom-provider-getColumnCount"><code>getColumnCount()</code></dfn></dt> <dd>Must return the number of columns currently in the data model (including columns that might be hidden). May be omitted if there is only one column. If the value that this method would return changes, the <code><a href="#datagrid0">datagrid</a></code> 's <code title="dom-datagrid-updateEverything"><a href= "#updateeverything">updateEverything()</a></code> method must be called.</dd> <dt><dfn id="getcaptiontext" title= "dom-provider-getCaptionText"><code>getCaptionText( <var title= "">column</var> )</code></dfn></dt> <dd>Must return the caption, or label, for column <var title= "">column</var> . May be omitted if the columns have no captions. If the value that this method would return changes, the <code><a href="#datagrid0">datagrid</a></code> 's <code title= "dom-datagrid-updateColumnChanged"><a href= "#updatecolumnchanged">updateColumnChanged()</a></code> method must be called with the appropriate column index.</dd> <dt><dfn id="getcaptionclasses" title= "dom-provider-getCaptionClasses"><code>getCaptionClasses( <var title="">column</var> , <var title="">classes</var> )</code></dfn></dt> <dd>Must add the classes that apply to column <var title= "">column</var> to the <var title="">classes</var> object. May be omitted if the columns have no special classes. If the classes that this method would add changes, the <code><a href= "#datagrid0">datagrid</a></code> 's <code title= "dom-datagrid-updateColumnChanged"><a href= "#updatecolumnchanged">updateColumnChanged()</a></code> method must be called with the appropriate column index. Some classes have <a href="#datagridClassSummary">predefined meanings</a> .</dd> <dt><dfn id="getrowimage" title= "dom-provider-getRowImage"><code>getRowImage( <var title= "">row</var> )</code></dfn></dt> <dd>Must return a URI to an image that represents row <var title= "">row</var> , or the empty string if there is no applicable image. May be omitted if no rows have associated images. If the value that this method would return changes, the <code><a href= "#datagrid0">datagrid</a></code> 's update methods must be called to update the row in question.</dd> <dt><dfn id="getrowmenu" title= "dom-provider-getRowMenu"><code>getRowMenu( <var title="">row</var> )</code></dfn></dt> <dd>Must return an <code><a href= "#htmlmenuelement">HTMLMenuElement</a></code> object that is to be used as a context menu for row <var title="">row</var> , or null if there is no particular context menu. May be omitted if none of the rows have a special context menu. As this method is called immediately before showing the menu in question, no precautions need to be taken if the return value of this method changes.</dd> <dt><dfn id="getrowclasses" title= "dom-provider-getRowClasses"><code>getRowClasses( <var title= "">row</var> , <var title="">classes</var> )</code></dfn></dt> <dd>Must add the classes that apply to row <var title="">row</var> to the <var title="">classes</var> object. May be omitted if the rows have no special classes. If the classes that this method would add changes, the <code><a href="#datagrid0">datagrid</a></code> 's update methods must be called to update the row in question. Some classes have <a href="#datagridClassSummary">predefined meanings</a> .</dd> <dt><dfn id="getcelldata" title= "dom-provider-getCellData"><code>getCellData( <var title= "">row</var> , <var title="">column</var> )</code></dfn></dt> <dd>Must return the value of the cell on row <var title= "">row</var> in column <var title="">column</var> . For text cells, this must be the text to show for that cell. For <a href= "#progress1" title="datagrid-cell-class-progress">progress bar cells</a> , this must be either a floating point number in the range 0.0 to 1.0 (converted to a string representation ), indicating the fraction of the progress bar to show as full (1.0 meaning complete), or the empty string, indicating an indeterminate progress bar. If the value that this method would return changes, the <code><a href="#datagrid0">datagrid</a></code> 's update methods must be called to update the rows that changed. If only one cell changed, the <code title= "dom-datagrid-updateCellChanged"><a href= "#updatecellchanged">updateCellChanged()</a></code> method may be used.</dd> <dt><dfn id="getcellclasses" title= "dom-provider-getCellClasses"><code>getCellClasses( <var title= "">row</var> , <var title="">column</var> , <var title= "">classes</var> )</code></dfn></dt> <dd>Must add the classes that apply to the cell on row <var title= "">row</var> in column <var title="">column</var> to the <var title="">classes</var> object. May be omitted if the cells have no special classes. If the classes that this method would add changes, the <code><a href="#datagrid0">datagrid</a></code> 's update methods must be called to update the rows or cells in question. Some classes have <a href= "#datagridClassSummary">predefined meanings</a> .</dd> <dt><dfn id="togglecolumnsortstate" title= "dom-provider-toggleColumnSortState"><code>toggleColumnSortState( <var title="">column</var> )</code></dfn></dt> <dd>Called by the <code><a href="#datagrid0">datagrid</a></code> when the user tries to sort the data using a particular column <var title="">column</var> . The data provider must update its state so that the <code title= "dom-provider-getChildAtPosition"><a href= "#getchildatposition">GetChildAtPosition()</a></code> method returns the new order, and the classes of the columns returned by <code title="dom-provider-getCaptionClasses"><a href= "#getcaptionclasses">getCaptionClasses()</a></code> represent the new sort status. There is no need to tell the <code><a href= "#datagrid0">datagrid</a></code> that it the data has changed, as the <code><a href="#datagrid0">datagrid</a></code> automatically assumes that the entire data model will need updating.</dd> <dt><dfn id="setcellcheckedstate" title= "dom-provider-setCellCheckedState"><code>setCellCheckedState( <var title="">row</var> , <var title="">column</var> , <var title= "">state</var> )</code></dfn></dt> <dd>Called by the <code><a href="#datagrid0">datagrid</a></code> when the user changes the state of a checkbox cell on row <var title="">row</var> , column <var title="">column</var> . The checkbox should be toggled to the state given by <var title= "">state</var> , which is a positive integer (1) if the checkbox is to be checked, zero (0) if it is to be unchecked, and a negative number <del class="diff-old">(-1)</del> <ins class= "diff-chg">(−1)</ins> if it is to be set to the indeterminate state. There is no need to tell the <code><a href= "#datagrid0">datagrid</a></code> that the cell has changed, as the <code><a href="#datagrid0">datagrid</a></code> automatically assumes that the given cell will need updating.</dd> <dt><dfn id="cyclecell" title= "dom-provider-cycleCell"><code>cycleCell( <var title="">row</var> , <var title="">column</var> )</code></dfn></dt> <dd>Called by the <code><a href="#datagrid0">datagrid</a></code> when the user changes the state of a cyclable cell on row <var title="">row</var> , column <var title="">column</var> . The data provider should change the state of the cell to the new state, as appropriate. There is no need to tell the <code><a href= "#datagrid0">datagrid</a></code> that the cell has changed, as the <code><a href="#datagrid0">datagrid</a></code> automatically assumes that the given cell will need updating.</dd> <dt><dfn id="editcell" title= "dom-provider-editCell"><code>editCell( <var title="">row</var> , <var title="">column</var> , <var title="">data</var> )</code></dfn></dt> <dd>Called by the <code><a href="#datagrid0">datagrid</a></code> when the user edits the cell on row <var title="">row</var> , column <var title="">column</var> . The new value of the cell is given by <var title="">data</var> . The data provider should update the cell accordingly. There is no need to tell the <code><a href= "#datagrid0">datagrid</a></code> that the cell has changed, as the <code><a href="#datagrid0">datagrid</a></code> automatically assumes that the given cell will need updating.</dd> </dl> The following classes (for rows, columns, and cells) may be usefully used in conjunction with this interface: <table id="datagridClassSummary"> <tbody> <tr> <th>Class name</th> <th>Applies to</th> <th>Description</th> </tr> <tr> <td><dfn id="checked" title= "datagrid-cell-class-checked"><code>checked</code></dfn></td> <td>Cells</td> <td>The cell has a checkbox and it is checked. (The <code title= "datagrid-cell-class-cyclable"><a href= "#cyclable">cyclable</a></code> and <code title= "datagrid-cell-class-progress"><a href= "#progress1">progress</a></code> classes override this, though.)</td> </tr> <tr> <td><dfn id="cyclable" title= "datagrid-cell-class-cyclable"><code>cyclable</code></dfn></td> <td>Cells</td> <td>The cell can be cycled through multiple values. (The <code title="datagrid-cell-class-progress"><a href= "#progress1">progress</a></code> class overrides this, though.)</td> </tr> <tr> <td><dfn id="editable" title= "datagrid-cell-class-editable"><code>editable</code></dfn></td> <td>Cells</td> <td>The cell can be edited. (The <code title= "datagrid-cell-class-cyclable"><a href= "#cyclable">cyclable</a></code> , <code title= "datagrid-cell-class-progress"><a href= "#progress1">progress</a></code> , <code title= "datagrid-cell-class-checked"><a href="#checked">checked</a></code> , <code title="datagrid-cell-class-checked"><a href= "#checked">unchecked</a></code> and <code title= "datagrid-cell-class-checked"><a href= "#checked">indeterminate</a></code> classes override this, though.)</td> </tr> <tr> <td><dfn id="header0" title= "datagrid-row-class-header"><code>header</code></dfn></td> <td>Rows</td> <td>The row is a heading, not a data row.</td> </tr> <tr> <td><dfn id="indeterminate" title= "datagrid-cell-class-indeterminate"><code>indeterminate</code></dfn></td> <td>Cells</td> <td>The cell has a checkbox, and it can be set to an indeterminate state. If neither the <code title= "datagrid-cell-class-checked"><a href="#checked">checked</a></code> nor <code title="datagrid-cell-class-checked"><a href= "#checked">unchecked</a></code> classes are present, then the checkbox is in that state, too. (The <code title= "datagrid-cell-class-cyclable"><a href= "#cyclable">cyclable</a></code> and <code title= "datagrid-cell-class-progress"><a href= "#progress1">progress</a></code> classes override this, though.)</td> </tr> <tr> <td><dfn id="initially-hidden" title= "datagrid-column-class-initially-hidden"><code>initially-hidden</code></dfn></td> <td>Columns</td> <td>The column will not be shown when the <code><a href= "#datagrid0">datagrid</a></code> is initially rendered. If this class is not present on the column when the <code><a href= "#datagrid0">datagrid</a></code> is initially rendered, the column will be visible if space allows.</td> </tr> <tr> <td><dfn id="initially-closed" title= "datagrid-row-class-initially-closed"><code>initially-closed</code></dfn></td> <td>Rows</td> <td>The row will be closed when the <code><a href= "#datagrid0">datagrid</a></code> is initially rendered. If neither this class nor the <code title= "datagrid-row-class-initially-open"><a href= "#initially-open">initially-open</a></code> class is present on the row when the <code><a href="#datagrid0">datagrid</a></code> is initially rendered, the initial state will depend on platform conventions.</td> </tr> <tr> <td><dfn id="initially-open" title= "datagrid-row-class-initially-open"><code>initially-open</code></dfn></td> <td>Rows</td> <td>The row will be opened when the <code><a href= "#datagrid0">datagrid</a></code> is initially rendered. If neither this class nor the <code title= "datagrid-row-class-initially-closed"><a href= "#initially-closed">initially-closed</a></code> class is present on the row when the <code><a href="#datagrid0">datagrid</a></code> is initially rendered, the initial state will depend on platform conventions.</td> </tr> <tr> <td><dfn id="progress1" title= "datagrid-cell-class-progress"><code>progress</code></dfn></td> <td>Cells</td> <td>The cell is a progress bar.</td> </tr> <tr> <td><dfn id="reversed1" title= "datagrid-column-class-reversed"><code>reversed</code></dfn></td> <td>Columns</td> <td>If the cell is sorted, the sort direction is descending, instead of ascending.</td> </tr> <tr> <td><dfn id="selectable-separator" title= "datagrid-row-class-selectable-separator"><code>selectable-separator</code></dfn></td> <td>Rows</td> <td>The row is a normal, selectable, data row, except that instead of having data, it only has a separator. (The <code title= "datagrid-row-class-header"><a href="#header0">header</a></code> and <code title="datagrid-row-class-separator"><a href= "#separator">separator</a></code> classes override this, though.)</td> </tr> <tr> <td><dfn id="separator" title= "datagrid-row-class-separator"><code>separator</code></dfn></td> <td>Rows</td> <td>The row is a separator row, not a data row. (The <code title= "datagrid-row-class-header"><a href="#header0">header</a></code> class overrides this, though.)</td> </tr> <tr> <td><dfn id="sortable" title= "datagrid-column-class-sortable"><code>sortable</code></dfn></td> <td>Columns</td> <td>The data can be sorted by this column.</td> </tr> <tr> <td><dfn id="sorted" title= "datagrid-column-class-sorted"><code>sorted</code></dfn></td> <td>Columns</td> <td>The data is sorted by this column. Unless the <code title= "datagrid-column-class-reversed"><a href= "#reversed1">reversed</a></code> class is also present, the sort direction is ascending.</td> </tr> <tr> <td><dfn id="unchecked" title= "datagrid-cell-class-unchecked"><code>unchecked</code></dfn></td> <td>Cells</td> <td>The cell has a checkbox and, unless the <code title= "datagrid-cell-class-checked"><a href="#checked">checked</a></code> class is present as well, it is unchecked. (The <code title= "datagrid-cell-class-cyclable"><a href= "#cyclable">cyclable</a></code> and <code title= "datagrid-cell-class-progress"><a href= "#progress1">progress</a></code> classes override this, though.)</td> </tr> </tbody> </table> <h5 id="the-default"><del class= "diff-old">3.18.2.4.</del> <ins class= "diff-chg">3.16.2.4.</ins> The default data provider</h5> The user agent must supply a default data provider for the case where the <code><a href="#datagrid0">datagrid</a></code> 's <code title="dom-datagrid-data"><a href="#data2">data</a></code> attribute is null. It must act as described in this section. The <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> of the default data provider depends on the nature of the first element child of the <code><a href= "#datagrid0">datagrid</a></code> . <dl class="switch"> <dt>While the first element child is a <code><a href= "#table">table</a></code> element</dt> <dd> <code title="dom-provider-getRowCount"><a href= "#getrowcount">getRowCount( <var title="">row</var> )</a></code> : The number of rows returned by the default data provider for the root of the tree (when <var title= "">row</var> is empty) must be the total number of <code><a href= "#tr">tr</a></code> elements that are children of <code><a href= "#tbody">tbody</a></code> elements that are children of the <code><a href="#table">table</a></code> , if there are any such child <code><a href="#tbody">tbody</a></code> elements. If there are no such <code><a href="#tbody">tbody</a></code> elements then the number of rows returned for the root must be the number of <code><a href="#tr">tr</a></code> elements that are children of the <code><a href="#table">table</a></code> . When <var title="">row</var> is not empty, the number of rows returned must be zero. The <code><a href="#table">table</a></code> -based default data provider cannot represent a tree. Rows in <code><a href="#thead0">thead</a></code> elements do not contribute to the number of rows returned, although they do affect the columns and column captions. Rows in <code><a href="#tfoot0">tfoot</a></code> elements are <a href= "#ignored" title="ignore">ignored</a> completely by this algorithm. <code title= "dom-provider-getChildAtPosition"><a href= "#getchildatposition">getChildAtPosition( <var title="">row</var> , <var title="">i</var> )</a></code> : The default data provider must return the mapping appropriate to the <a href= "#defaultDataProviderTableSort">current sort order</a> . <code title="dom-provider-getColumnCount"><a href= "#getcolumncount">getColumnCount()</a></code> : The number of columns returned must be the number of <code><a href= "#td">td</a></code> element children in the first <code><a href= "#tr">tr</a></code> element child of the first <code><a href= "#tbody">tbody</a></code> element child of the <code><a href= "#table">table</a></code> , if there are any such <code><a href= "#tbody">tbody</a></code> elements. If there are no such <code><a href="#tbody">tbody</a></code> elements, then it must be the number of <code><a href="#td">td</a></code> element children in the first <code><a href="#tr">tr</a></code> element child of the <code><a href="#table">table</a></code> , if any, or otherwise 1. If the number that would be returned by these rules is 0, then 1 must be returned instead. <code title="dom-provider-getCaptionText"><a href= "#getcaptiontext">getCaptionText( <var title="">i</var> )</a></code> : If the <code><a href= "#table">table</a></code> has no <code><a href= "#thead0">thead</a></code> element child, or if its first <code><a href="#thead0">thead</a></code> element child has no <code><a href="#tr">tr</a></code> element child, the default data provider must return the empty string for all captions. Otherwise, the value of the <code><a href= "#textcontent">textContent</a></code> attribute of the <var title= "">i</var> th <code><a href="#th">th</a></code> element child of the first <code><a href="#tr">tr</a></code> element child of the first <code><a href="#thead0">thead</a></code> element child of the <code><a href="#table">table</a></code> element must be returned. If there is no such <code><a href="#th">th</a></code> element, the empty string must be returned. <code title="dom-provider-getCaptionClasses"><a href= "#getcaptionclasses">getCaptionClasses( <var title="">i</var> , <var title="">classes</var> )</a></code> : If the <code><a href="#table">table</a></code> has no <code><a href= "#thead0">thead</a></code> element child, or if its first <code><a href="#thead0">thead</a></code> element child has no <code><a href="#tr">tr</a></code> element child, the default data provider must not add any classes for any of the captions. Otherwise, each class in the <code title="attr-class"><a href= "#class">class</a></code> attribute of the <var title="">i</var> th <code><a href="#th">th</a></code> element child of the first <code><a href="#tr">tr</a></code> element child of the first <code><a href="#thead0">thead</a></code> element child of the <code><a href="#table">table</a></code> element must be added to the <var title="">classes</var> . If there is no such <code><a href="#th">th</a></code> element, no classes must be added. The user agent must then: <ol> <li>Remove the <code title="datagrid-column-class-sorted"><a href= "#sorted">sorted</a></code> and <code title= "datagrid-column-class-reversed"><a href= "#reversed1">reversed</a></code> classes.</li> <li>If the <code><a href="#table">table</a></code> element has a <code title="attr-class"><a href="#class">class</a></code> attribute that includes the <code title="">sortable</code> class, add the <code title="datagrid-column-class-sortable"><a href= "#sortable">sortable</a></code> class.</li> <li>If the column is the one currently being used to sort the data, add the <code title="datagrid-column-class-sorted"><a href= "#sorted">sorted</a></code> class.</li> <li>If the column is the one currently being used to sort the data, and it is sorted in descending order, add the <code title= "datagrid-column-class-reversed"><a href= "#reversed1">reversed</a></code> class as well.</li> </ol> The various row- and cell- related methods operate relative to a particular element, the element of the row or cell specified by their arguments. For rows : Since the default data provider for a <code><a href="#table">table</a></code> always returns 0 as the number of children for any row other than the root, the path to the row passed to these methods will always consist of a single number. In the prose below, this number is referred to as <var title= "">i</var> . If the <code><a href="#table">table</a></code> has <code><a href="#tbody">tbody</a></code> element children, the element for the <var title="">i</var> th row is the <var title= "">i</var> th <code><a href="#tr">tr</a></code> element that is a child of a <code><a href="#tbody">tbody</a></code> element that is a child of the <code><a href="#table">table</a></code> element. If the <code><a href="#table">table</a></code> does not have <code><a href="#tbody">tbody</a></code> element children, then the element for the <var title="">i</var> th real row is the <var title="">i</var> th <code><a href="#tr">tr</a></code> element that is a child of the <code><a href="#table">table</a></code> element. For cells : Given a row and its element, the row's <var title="">i</var> th cell's element is the <var title= "">i</var> th <code><a href="#td">td</a></code> element child of the row element. The <code>colspan</code> and <code>rowspan</code> attributes are <a href="#ignored" title="ignore">ignored</a> by this algorithm. <code title="dom-provider-getRowImage"><a href= "#getrowimage">getRowImage( <var title="">i</var> )</a></code> : If the row's first cell's element has an <code><a href="#img">img</a></code> element child, then the URI of the row's image is the URI of the first <code><a href= "#img">img</a></code> element child of the row's first cell's element. Otherwise, the URI of the row's image is the empty string. <code title="dom-provider-getRowMenu"><a href= "#getrowmenu">getRowMenu( <var title="">i</var> )</a></code> : If the row's first cell's element has a <code><a href="#menu">menu</a></code> element child, then the row's menu is the first <code><a href="#menu">menu</a></code> element child of the row's first cell's element. Otherwise, the row has no menu. <code title="dom-provider-getRowClasses"><a href= "#getrowclasses">getRowClasses( <var title="">i</var> , <var title= "">classes</var> )</a></code> : The default data provider must never add a class to the row's classes. <code title= "dom-provider-toggleColumnSortState"><a href= "#togglecolumnsortstate">toggleColumnSortState( <var title= "">i</var> )</a></code> : If the data is already being sorted on the given column, then the user agent must change the current sort mapping to be the inverse of the current sort mapping; if the sort order was ascending before, it is now descending, otherwise it is now ascending. Otherwise, if the current sort column is another column, or the data model is currently not sorted, the user agent must create a new mapping, which maps rows in the data model to rows in the DOM so that the rows in the data model are sorted by the specified column, in ascending order. (Which sort comparison operator to use is left up to the UA to decide.) When the sort mapping is changed, the values returned by the <code title="dom-provider-getChildAtPosition"><a href= "#getchildatposition">getChildAtPosition()</a></code> method for the default data provider <a href= "#defaultDataProviderTableMapper">will change appropriately</a> . <code title="dom-provider-getCellData"><a href= "#getcelldata">getCellData( <var title="">i</var> , <var title= "">j</var> )</a></code> , <code title= "dom-provider-getCellClasses"><a href= "#getcellclasses">getCellClasses( <var title="">i</var> , <var title="">j</var> , <var title="">classes</var> )</a></code> , <code title="dom-provider-setCellCheckedState"><a href= "#setcellcheckedstate">getCellCheckedState( <var title="">i</var> , <var title="">j</var> , <var title="">state</var> )</a></code> , <code title="dom-provider-cycleCell"><a href= "#cyclecell">cycleCell( <var title="">i</var> , <var title= "">j</var> )</a></code> , and <code title= "dom-provider-editCell"><a href="#editcell">editCell( <var title= "">i</var> , <var title="">j</var> , <var title="">data</var> )</a></code> : See <a href= "#commonDefaultDataGridMethodDefinitions">the common definitions below</a> . The data provider must call the <code><a href= "#datagrid0">datagrid</a></code> 's update methods appropriately whenever the descendants of the <code><a href= "#datagrid0">datagrid</a></code> mutate. For example, if a <code><a href="#tr">tr</a></code> is removed, then the <code title= "dom-datagrid-updateRowsRemoved"><a href= "#updaterowsremoved">updateRowsRemoved()</a></code> methods would probably need to be invoked, and any change to a cell or its descendants must cause the cell to be updated. If the <code><a href="#table">table</a></code> element stops being the first child of the <code><a href="#datagrid0">datagrid</a></code> , then the data provider must call the <code title= "dom-datagrid-updateEverything"><a href= "#updateeverything">updateEverything()</a></code> method on the <code><a href="#datagrid0">datagrid</a></code> . Any change to a cell that is in the column that the data provider is currently using as its sort column must also cause the sort to be reperformed, with a call to <code title= "dom-datagrid-updateEverything"><a href= "#updateeverything">updateEverything()</a></code> if the change did affect the sort order. </dd> <dt>While the first element child is a <code>select</code> or <code>datalist</code> element</dt> <dd> The default data provider must return 1 for the column count, the empty string for the column's caption, and must not add any classes to the column's classes. For the rows, assume the existence of a node filter view of the descendants of the first element child of the <code><a href= "#datagrid0">datagrid</a></code> element (the <code>select</code> or <code>datalist</code> element), that skips all nodes other than <code>optgroup</code> and <code>option</code> elements, as well as any descendents of any <code>option</code> elements. Given a path <var title="">row</var> , the corresponding element is the one obtained by drilling into the view, taking the child given by the path each time. <div class="example"> Given the following XML markup: <pre> <datagrid> <select> <!-- the options and optgroups have had their labels and values removed to make the underlying structure clearer --> <optgroup> <option/> <option/> </optgroup> <optgroup> <option/> <optgroup id="a"> <option/> <option/> <bogus/> <option id="b"/> </optgroup> <option/> </optgroup> </select> </datagrid> </pre> The path "1,1,2" would select the element with ID "b". In the filtered view, the text nodes, comment nodes, and bogus elements are ignored; so for instance, the element with ID "a" (path "1,1") has only 3 child nodes in the view. </div> <code title="dom-provider-getRowCount"><a href= "#getrowcount">getRowCount( <var title="">row</var> )</a></code> must drill through the view to find the element corresponding to the method's argument, and return the number of child nodes in the filtered view that the corresponding element has. (If the <var title="">row</var> is empty, the corresponding element is the <code>select</code> element at the root of the filtered view.) <code title="dom-provider-getChildAtPosition"><a href= "#getchildatposition">getChildAtPosition( <var title="">row</var> , <var title="">position</var> )</a></code> must return <var title= "">position</var> . (The <code>select</code> / <code>datalist</code> default data provider does not support sorting the data grid.) <code title="dom-provider-getRowImage"><a href= "#getrowimage">getRowImage( <var title="">i</var> )</a></code> must return the empty string, <code title= "dom-provider-getRowMenu"><a href="#getrowmenu">getRowMenu( <var title="">i</var> )</a></code> must return null. <code title="dom-provider-getRowClasses"><a href= "#getrowclasses">getRowClasses( <var title="">row</var> , <var title="">classes</var> )</a></code> must add the classes from the following list to <var title="">classes</var> when their condition is met: <ul> <li>If the <var title="">row</var> 's corresponding element is an <code>optgroup</code> element: <code title= "datagrid-row-class-header"><a href= "#header0">header</a></code></li> <li>If the <var title="">row</var> 's corresponding element contains other elements that are also in the view, and the element's <code title="attr-class"><a href= "#class">class</a></code> attribute contains the <code title= "">closed</code> class: <code title= "datagrid-row-class-initially-closed"><a href= "#initially-closed">initially-closed</a></code></li> <li>If the <var title="">row</var> 's corresponding element contains other elements that are also in the view, and the element's <code title="attr-class"><a href= "#class">class</a></code> attribute contains the <code title= "">open</code> class: <code title= "datagrid-row-class-initially-open"><a href= "#initially-open">initially-open</a></code></li> </ul> The <code title="dom-provider-getCellData"><a href= "#getcelldata">getCellData( <var title="">row</var> , <var title= "">cell</var> )</a></code> method must return the value of the <code title="attr-optgroup-label">label</code> attribute if the <var title="">row</var> 's corresponding element is an <code>optgroup</code> element, otherwise, if the <var title= "">row</var> 's corresponding element is an <code>option</code> element, its <code title="attr-option-label">label</code> attribute if it has one, otherwise the value of its <code><a href= "#textcontent">textContent</a></code> DOM attribute. The <code title="dom-provider-getCellClasses"><a href= "#getcellclasses">getCellClasses( <var title="">row</var> , <var title="">cell</var> , <var title="">classes</var> )</a></code> method must add no classes. autoselect some rows when <del class= "diff-old">initialised,</del> <ins class= "diff-chg">initialized,</ins> reflect the selection in the select, reflect the multiple attribute somehow. The data provider must call the <code><a href= "#datagrid0">datagrid</a></code> 's update methods appropriately whenever the descendants of the <code><a href= "#datagrid0">datagrid</a></code> mutate. </dd> <dt>While the first element child is another element</dt> <dd> The default data provider must return 1 for the column count, the empty string for the column's caption, and must not add any classes to the column's classes. For the rows, assume the existence of a node filter view of the descendants of the <code><a href="#datagrid0">datagrid</a></code> that skips all nodes other than <code><a href="#li">li</a></code> , <code><a href="#h1">h1</a></code> <del class="diff-old">-</del> <ins class="diff-chg">–</ins> <code><a href="#h6">h6</a></code> , and <code><a href="#hr">hr</a></code> elements, and skips any descendants of <code><a href="#menu">menu</a></code> elements. Given this view, each element in the view represents a row in the data model. The element corresponding to a path <var title= "">row</var> is the one obtained by drilling into the view, taking the child given by the path each time. The element of the row of a particular method call is the element given by drilling into the view along the path given by the method's arguments. <code title="dom-provider-getRowCount"><a href= "#getrowcount">getRowCount( <var title="">row</var> )</a></code> must return the number of child elements in this view for the given row, or the number of elements at the root of the view if the <var title="">row</var> is empty. <div class="example"> In the following example, the elements are identified by the paths given by their child text nodes: <pre> <datagrid> <ol> <li> row 0 </li> <li> row 1 <ol> <li> row 1,0 </li> </ol> </li> <li> row 2 </li> </ol> </datagrid> </pre> In this example, only the <code><a href="#li">li</a></code> elements actually appear in the data grid; the <code><a href= "#ol">ol</a></code> element does not affect the data grid's processing model. </div> <code title="dom-provider-getChildAtPosition"><a href= "#getchildatposition">getChildAtPosition( <var title="">row</var> , <var title="">position</var> )</a></code> must return <var title= "">position</var> . (The generic default data provider does not support sorting the data grid.) <code title="dom-provider-getRowImage"><a href= "#getrowimage">getRowImage( <var title="">i</var> )</a></code> must return the URI of the image given by the first <code><a href= "#img">img</a></code> element descendant (in the real DOM) of the row's element, that is not also a descendant of another element in the filtered view that is a descendant of the row's element. <div class="example"> In the following example, the row with path "1,0" returns "http://example.com/a" as its image URI, and the other rows (including the row with path "1") return the empty string: <pre> <datagrid> <ol> <li> row 0 </li> <li> row 1 <ol> <li> row 1,0 <img src="http://example.com/a" alt=""> </li> </ol> </li> <li> row 2 </li> </ol> </datagrid> </pre></div> <code title="dom-provider-getRowMenu"><a href= "#getrowmenu">getRowMenu( <var title="">i</var> )</a></code> must return the first <code><a href="#menu">menu</a></code> element descendant (in the real DOM) of the row's element, that is not also a descendant of another element in the filtered view that is a <del class="diff-old">decsendant</del> <ins class= "diff-chg">descendant</ins> of the row's element. (This is analogous to the image case above.) <code title="dom-provider-getRowClasses"><a href= "#getrowclasses">getRowClasses( <var title="">i</var> , <var title= "">classes</var> )</a></code> must add the classes from the following list to <var title="">classes</var> when their condition is met: <ul> <li>If the row's element contains other elements that are also in the view, and the element's <code title="attr-class"><a href= "#class">class</a></code> attribute contains the <code title= "">closed</code> class: <code title= "datagrid-row-class-initially-closed"><a href= "#initially-closed">initially-closed</a></code></li> <li>If the row's element contains other elements that are also in the view, and the element's <code title="attr-class"><a href= "#class">class</a></code> attribute contains the <code title= "">open</code> class: <code title= "datagrid-row-class-initially-open"><a href= "#initially-open">initially-open</a></code></li> <li>If the row's element is an <code><a href="#h1">h1</a></code> <del class="diff-old">-</del> <ins class="diff-chg">–</ins> <code><a href="#h6">h6</a></code> element: <code title= "datagrid-row-class-header"><a href= "#header0">header</a></code></li> <li>If the row's element is an <code><a href="#hr">hr</a></code> element: <code title="datagrid-row-class-separator"><a href= "#separator">separator</a></code></li> </ul> The <code title="dom-provider-getCellData"><a href= "#getcelldata">getCellData( <var title="">i</var> , <var title= "">j</var> )</a></code> , <code title= "dom-provider-getCellClasses"><a href= "#getcellclasses">getCellClasses( <var title="">i</var> , <var title="">j</var> , <var title="">classes</var> )</a></code> , <code title="dom-provider-setCellCheckedState"><a href= "#setcellcheckedstate">getCellCheckedState( <var title="">i</var> , <var title="">j</var> , <var title="">state</var> )</a></code> , <code title="dom-provider-cycleCell"><a href= "#cyclecell">cycleCell( <var title="">i</var> , <var title= "">j</var> )</a></code> , and <code title= "dom-provider-editCell"><a href="#editcell">editCell( <var title= "">i</var> , <var title="">j</var> , <var title="">data</var> )</a></code> methods must act as described in <a href= "#commonDefaultDataGridMethodDefinitions">the common definitions below</a> , treating the row's element as being the cell's element. selection handling? The data provider must call the <code><a href= "#datagrid0">datagrid</a></code> 's update methods appropriately whenever the descendants of the <code><a href= "#datagrid0">datagrid</a></code> mutate. </dd> <dt>Otherwise, while there is no element child</dt> <dd> The data provider must return 0 for the number of rows, 1 for the number of columns, the empty string for the first column's caption, and must add no classes when asked for that column's classes. If the <code><a href="#datagrid0">datagrid</a></code> 's child list changes such that there is a first element child, then the data provider must call the <code title= "dom-datagrid-updateEverything"><a href= "#updateeverything">updateEverything()</a></code> method on the <code><a href="#datagrid0">datagrid</a></code> . </dd> </dl> <h6 id="commonDefaultDataGridMethodDefinitions"><del class="diff-old">3.18.2.4.1.</del> <ins class= "diff-chg">3.16.2.4.1.</ins> Common default data provider method definitions for cells</h6> These definitions are used for the cell-specific methods of the default data providers (other than in the <code>select</code> / <code>datalist</code> case). How they behave is based on the contents of an element that represents the cell given by their first two arguments. Which element that is is defined in the previous section. <dl> <dt>Cyclable cells</dt> <dd> If the first element child of a cell's element is a <code>select</code> element that has a no <code title= "attr-select-multiple">multiple</code> attribute and has at least one <code>option</code> element descendent, then the cell acts as a cyclable cell. The "current" <code>option</code> element is the selected <code>option</code> element, or the first <code>option</code> element if none is selected. The <code title="dom-provider-getCellData"><a href= "#getcelldata">getCellData()</a></code> method must return the <code><a href="#textcontent">textContent</a></code> of the current <code>option</code> element (the <code title= "attr-option-label">label</code> attribute is <a href="#ignored" title="ignore">ignored</a> in this context as the <code>optgroup</code> s are not displayed). The <code title="dom-provider-getCellClasses"><a href= "#getcellclasses">getCellClasses()</a></code> method must add the <code title="datagrid-cell-class-cyclable"><a href= "#cyclable">cyclable</a></code> class and then all the classes of the current <code>option</code> element. The <code title="dom-provider-cycleCell"><a href= "#cyclecell">cycleCell()</a></code> method must change the selection of the <code>select</code> element such that the next <code>option</code> element after the current <code>option</code> element is the only one that is selected (in <a href= "#tree-order">tree order</a> ). If the current <code>option</code> element is the last <code>option</code> element descendent of the <code>select</code> , then the first <code>option</code> element descendent must be selected instead. The <code title="dom-provider-setCellCheckedState"><a href= "#setcellcheckedstate">setCellCheckedState()</a></code> and <code title="dom-provider-editCell"><a href= "#editcell">editCell()</a></code> methods must do nothing. </dd> <dt>Progress bar cells</dt> <dd> If the first element child of a cell's element is a <code><a href="#progress">progress</a></code> element, then the cell acts as a progress bar cell. The <code title="dom-provider-getCellData"><a href= "#getcelldata">getCellData()</a></code> method must return the value returned by the <code><a href="#progress">progress</a></code> element's <code title="dom-progress-position"><a href= "#position">position</a></code> DOM attribute. The <code title="dom-provider-getCellClasses"><a href= "#getcellclasses">getCellClasses()</a></code> method must add the <code title="datagrid-cell-class-progress"><a href= "#progress1">progress</a></code> class. The <code title="dom-provider-setCellCheckedState"><a href= "#setcellcheckedstate">setCellCheckedState()</a></code> , <code title="dom-provider-cycleCell"><a href= "#cyclecell">cycleCell()</a></code> , and <code title= "dom-provider-editCell"><a href="#editcell">editCell()</a></code> methods must do nothing. </dd> <dt>Checkbox cells</dt> <dd> If the first element child of a cell's element is an <code>input</code> element that has a <code title= "attr-input-type">type</code> attribute with the value <code title= "">checkbox</code> , then the cell acts as a check box cell. The <code title="dom-provider-getCellData"><a href= "#getcelldata">getCellData()</a></code> method must return the <code><a href="#textcontent">textContent</a></code> of the cell element. The <code title="dom-provider-getCellClasses"><a href= "#getcellclasses">getCellClasses()</a></code> method must add the <code title="datagrid-cell-class-checked"><a href= "#checked">checked</a></code> class if the <code>input</code> element is checked , and the <code title="datagrid-cell-class-unchecked"><a href= "#unchecked">unchecked</a></code> class otherwise. The <code title="dom-provider-setCellCheckedState"><a href= "#setcellcheckedstate">setCellCheckedState()</a></code> method must set the <code>input</code> element's checkbox state to checked if the method's third argument is 1, and to unchecked otherwise. The <code title="dom-provider-cycleCell"><a href= "#cyclecell">cycleCell()</a></code> and <code title= "dom-provider-editCell"><a href="#editcell">editCell()</a></code> methods must do nothing. </dd> <dt>Editable cells</dt> <dd> If the first element child of a cell's element is an <code>input</code> element that has a <code title= "attr-input-type">type</code> attribute with the value <code title= "">text</code> or that has no <code title= "attr-input-type">type</code> attribute at all, then the cell acts as an editable cell. The <code title="dom-provider-getCellData"><a href= "#getcelldata">getCellData()</a></code> method must return the <code title="dom-input-value">value</code> of the <code>input</code> element. The <code title="dom-provider-getCellClasses"><a href= "#getcellclasses">getCellClasses()</a></code> method must add the <code title="datagrid-cell-class-editable"><a href= "#editable">editable</a></code> class. The <code title="dom-provider-editCell"><a href= "#editcell">editCell()</a></code> method must set the <code>input</code> element's <code title= "dom-input-value">value</code> DOM attribute to the value of the third argument to the method. The <code title="dom-provider-setCellCheckedState"><a href= "#setcellcheckedstate">setCellCheckedState()</a></code> and <code title="dom-provider-cycleCell"><a href= "#cyclecell">cycleCell()</a></code> methods must do nothing. </dd> </dl> <h5 id="populating"><del class= "diff-old">3.18.2.5.</del> <ins class= "diff-chg">3.16.2.5.</ins> Populating the <code><a href= "#datagrid0">datagrid</a></code> element</h5> A <code><a href="#datagrid0">datagrid</a></code> must be disabled until its end tag has been parsed (in the case of a <code><a href="#datagrid0">datagrid</a></code> element in the original document markup) or until it has been inserted into the document (in the case of a dynamically created element). After that point, the element must fire a single <code title= "event-load"><a href="#load0">load</a></code> event at itself, which doesn't bubble and cannot be canceled. The end-tag parsing thing should be moved to the parsing section. The <code><a href="#datagrid0">datagrid</a></code> must then populate itself using the data provided by the data provider assigned to the <code title="dom-datagrid-data"><a href= "#data2">data</a></code> DOM attribute. After the view is populated (using the methods described below), the <code><a href= "#datagrid0">datagrid</a></code> must invoke the <code title= "dom-provider-initialize"><a href= "#initialize">initialize()</a></code> method on the data provider specified by the <code title="dom-datagrid-data"><a href= "#data2">data</a></code> attribute, passing itself (the <code><a href="#htmldatagridelement">HTMLDataGridElement</a></code> object) as the only argument. When the <code title="dom-datagrid-data"><a href= "#data2">data</a></code> attribute is null, the <code><a href= "#datagrid0">datagrid</a></code> must use the default data provider described in the previous section. To obtain data from the data provider, the element must invoke methods on the data provider object in the following ways: <dl> <dt>To determine the total number of columns</dt> <dd>Invoke the <code title="dom-provider-getColumnCount"><a href= "#getcolumncount">getColumnCount()</a></code> method with no arguments. The return value is the number of columns. If the return value is zero or negative, not an integer, or simply not a numeric type, or if the method is not defined, then 1 must be used instead.</dd> <dt>To get the captions to use for the columns</dt> <dd>Invoke the <code title="dom-provider-getCaptionText"><a href= "#getcaptiontext">getCaptionText()</a></code> method with the index of the column in question. The index <var title="">i</var> must be in the range 0 ≤ <var title="">i</var> < <var title="">N</var> , where <var title="">N</var> is the total number of columns. The return value is the string to use when referring to that column. If the method returns null or the empty string, the column has no caption. If the method is not defined, then none of the columns have any captions.</dd> <dt>To establish what classes apply to a column</dt> <dd>Invoke the <code title= "dom-provider-getCaptionClasses"><a href="#getcaptionclasses">getCaptionClasses()</a></code> method with the index of the column in question, and an object implementing the <code><a href= "#domtokenlist0">DOMTokenList</a></code> interface, associated with an anonymous empty string. The index <var title="">i</var> must be in the range 0 ≤ <var title="">i</var> < <var title="">N</var> , where <var title="">N</var> is the total number of columns. The tokens contained in the string underlying <code><a href= "#domtokenlist0">DOMTokenList</a></code> object when the method returns represent the classes that apply to the given column. If the method is not defined, no classes apply to the column.</dd> <dt>To establish whether a column should be initially included in the visible columns</dt> <dd>Check whether the <code title= "datagrid-column-class-initially-hidden"><a href= "#initially-hidden">initially-hidden</a></code> class applies to the column. If it does, then the column should not be initially included; if it does not, then the column should be initially included.</dd> <dt id="columnType2">To establish whether the data can be sorted relative to a particular column</dt> <dd>Check whether the <code title= "datagrid-column-class-sortable"><a href= "#sortable">sortable</a></code> class applies to the column. If it does, then the user should be able to ask the UA to display the data sorted by that column; if it does not, then the user agent must not allow the user to ask for the data to be sorted by that column.</dd> <dt>To establish if a column is a sorted column</dt> <dd>If the user agent can handle multiple columns being marked as sorted simultaneously: Check whether the <code title= "datagrid-column-class-sorted"><a href="#sorted">sorted</a></code> class applies to the column. If it does, then that column is the sorted column, otherwise it is not.</dd> <dd>If the user agent can only handle one column being marked as sorted at a time: Check each column in turn, starting with the first one, to see whether the <code title= "datagrid-column-class-sorted"><a href="#sorted">sorted</a></code> class applies to that column. The first column that has that class, if any, is the sorted column. If none of the columns have that class, there is no sorted column.</dd> <dt>To establish the sort direction of a sorted column</dt> <dd>Check whether the <code title= "datagrid-column-class-reversed"><a href= "#reversed1">reversed</a></code> class applies to the column. If it does, then the sort direction is descending (down; first rows have the highest values), otherwise it is ascending (up; first rows have the lowest values).</dd> <dt>To determine the total number of rows</dt> <dd>Determine the number of rows for the root of the data grid, and determine the number of child rows for each open row. The total number of rows is the sum of all these numbers.</dd> <dt>To determine the number of rows for the root of the data grid</dt> <dd>Invoke the <code title="dom-provider-getRowCount"><a href= "#getrowcount">getRowCount()</a></code> method with a <code><a href="#rowspecification">RowSpecification</a></code> object representing the empty path as its only argument. The return value is the number of rows at the top level of the data grid. If the return value of the method is negative, not an integer, or simply not a numeric type, or if the method is not defined, then zero must be used instead.</dd> <dt>To determine the number of child rows for a row</dt> <dd>Invoke the <code title="dom-provider-getRowCount"><a href= "#getrowcount">getRowCount()</a></code> method with a <code><a href="#rowspecification">RowSpecification</a></code> object representing the path to the row in question. The return value is the number of child rows for the given row. If the return value of the method is negative, not an integer, or simply not a numeric type, or if the method is not defined, then zero must be used instead.</dd> <dt>To determine what order to render rows in</dt> <dd> Invoke the <code title= "dom-provider-getChildAtPosition"><a href="#getchildatposition">getChildAtPosition()</a></code> method with a <code><a href= "#rowspecification">RowSpecification</a></code> object representing the path to the parent of the rows that are being rendered as the first argument, and the position that is being rendered as the second argument. The return value is the index of the row to render in that position. <div class="example"> If the rows are: <ol> <li>Row "0" <ol> <li>Row "0,0"</li> <li>Row "0,1"</li> </ol> </li> <li>Row "1" <ol> <li>Row "1,0"</li> <li>Row "1,1"</li> </ol> </li> </ol> ...and the <code title= "dom-provider-getChildAtPosition"><a href="#getchildatposition">getChildAtPosition()</a></code> method is implemented as follows: <pre> function getChildAtPosition(parent, child) { // always return the reverse order return getRowCount(parent)-child-1; } </pre> ...then the rendering would actually be: <ol> <li>Row "1" <ol> <li>Row "1,1"</li> <li>Row "1,0"</li> </ol> </li> <li>Row "0" <ol> <li>Row "0,1"</li> <li>Row "0,0"</li> </ol> </li> </ol> </div> If the return value of the method is negative, larger than the number of rows that the <code title= "dom-provider-getRowCount"><a href= "#getrowcount">getRowCount()</a></code> method reported for that parent, not an integer, or simply not a numeric type, then the entire data grid should be disabled. Similarly, if the method returns the same value for two or more different values for the second argument (with the same first argument, and assuming that the data grid hasn't had relevant update methods invoked in the meantime), then the data grid should be disabled. Instead of disabling the data grid, the user agent may act as if the <code title="dom-provider-getChildAtPosition"><a href= "#getchildatposition">getChildAtPosition()</a></code> method was not defined on the data provider (thus disabling sorting for that data grid, but still letting the user interact with the data). If the method is not defined, then the return value must be assumed to be the same as the second argument (an <del class= "diff-old">indentity</del> <ins class="diff-chg">identity</ins> transform; the data is rendered in its natural order). </dd> <dt>To establish what classes apply to a row</dt> <dd>Invoke the <code title="dom-provider-getRowClasses"><a href= "#getrowclasses">getRowClasses()</a></code> method with a <code><a href="#rowspecification">RowSpecification</a></code> object representing the row in question, and a <code><a href= "#domtokenlist0">DOMTokenList</a></code> associated with an empty string. The tokens contained in the <code><a href= "#domtokenlist0">DOMTokenList</a></code> object's underlying string when the method returns represent the classes that apply to the row in question. If the method is not defined, no classes apply to the row.</dd> <dt>To establish whether a row is a data row or a special row</dt> <dd>Examine the classes that apply to the row. If the <code title= "datagrid-row-class-header"><a href="#header0">header</a></code> class applies to the row, then it is not a data row, it is a subheading. The data from the first cell of the row is the text of the subheading, the rest of the cells must be ignored. Otherwise, if the <code title="datagrid-row-class-separator"><a href= "#separator">separator</a></code> class applies to the row, then in the place of the row, a separator should be shown. Otherwise, if the <code title="datagrid-row-class-selectable-separator"><a href= "#selectable-separator">selectable-separator</a></code> class applies to the row, then the row should be a data row, but represented as a separator. (The difference between a <code title= "datagrid-row-class-separator"><a href= "#separator">separator</a></code> and a <code title= "datagrid-row-class-selectable-separator"><a href= "#selectable-separator">selectable-separator</a></code> is that the former is not an item that can be actually selected, whereas the second can be selected and thus has a context menu that applies to it, and so forth.) For both kinds of separator rows, the data of the rows' cells must all be ignored. If none of those three classes apply then the row is a simple data row.</dd> <dt id="rowType1">To establish whether a row is openable</dt> <dd>Determine the number of child rows for that row. If there are one or more child rows, then the row is openable.</dd> <dt>To establish whether a row should be initially open or closed</dt> <dd>If <a href="#rowType1">the row is openable</a> , examine the classes that apply to the row. If the <code title= "datagrid-row-class-initially-open"><a href= "#initially-open">initially-open</a></code> class applies to the row, then it should be initially open. Otherwise, if the <code title="datagrid-row-class-initially-closed"><a href= "#initially-closed">initially-closed</a></code> class applies to the row, then it must be initially closed. Otherwise, if neither class applies to the row, or if the row is not openable, then the initial state of the row <del class="diff-old">is entirely up to the UA.</del> <ins class="diff-chg">should be based on platform conventions.</ins></dd> <dt>To obtain a URI to an image representing a row</dt> <dd>Invoke the <code title="dom-provider-getRowImage"><a href= "#getrowimage">getRowImage()</a></code> method with a <code><a href="#rowspecification">RowSpecification</a></code> object representing the row in question. The return value is a string representing a URI (or IRI) to an image. Relative URIs must be interpreted relative to the <code><a href= "#datagrid0">datagrid</a></code> 's <a href="#elements2" title= "element's base URI">base <del class="diff-old">URI.</del> <ins class="diff-chg">URI</ins></a> . If the method returns the empty string, null, or if the method is not defined, then the row has no associated image.</dd> <dt>To obtain a context menu appropriate for a particular row</dt> <dd>Invoke the <code title="dom-provider-getRowMenu"><a href= "#getrowmenu">getRowMenu()</a></code> method with a <code><a href= "#rowspecification">RowSpecification</a></code> object representing the row in question. The return value is a reference to an object implementing the <code><a href= "#htmlmenuelement">HTMLMenuElement</a></code> interface, i.e. a <code><a href="#menu">menu</a></code> element DOM node. (This element must then be interpreted as described in the section on context menus to obtain the actual context menu to use. ) If the method returns something that is not an <code><a href= "#htmlmenuelement">HTMLMenuElement</a></code> , or if the method is not defined, then the row has no associated context menu. User agents may provide their own default context menu, and may add items to the author-provided context menu. For example, such a menu could allow the user to change the presentation of the <code><a href="#datagrid0">datagrid</a></code> element.</dd> <dt>To establish the value of a particular cell</dt> <dd>Invoke the <code title="dom-provider-getCellData"><a href= "#getcelldata">getCellData()</a></code> method with the first argument being a <code><a href= "#rowspecification">RowSpecification</a></code> object representing the row of the cell in question and the second argument being the index of the cell's column. The second argument must be a non-negative integer less than the total number of columns. The return value is the value of the cell. If the return value is null or the empty string, or if the method is not defined, then the cell has no data. (For progress bar cells, the cell's value must be further interpreted, as described below.)</dd> <dt>To establish what classes apply to a cell</dt> <dd>Invoke the <code title="dom-provider-getCellClasses"><a href= "#getcellclasses">getCellClasses()</a></code> method with the first argument being a <code><a href= "#rowspecification">RowSpecification</a></code> object representing the row of the cell in question, the second argument being the index of the cell's column, and the third being an object implementing the <code><a href= "#domtokenlist0">DOMTokenList</a></code> interface, associated with an empty string. The second argument must be a non-negative integer less than the total number of columns. The tokens contained in the <code><a href="#domtokenlist0">DOMTokenList</a></code> object's underlying string when the method returns represent the classes that apply to that cell. If the method is not defined, no classes apply to the cell.</dd> <dt id="cellType1">To establish how the type of a cell</dt> <dd>Examine the classes that apply to the cell. If the <code title= "datagrid-cell-class-progress"><a href= "#progress1">progress</a></code> class applies to the cell, it is a progress bar. Otherwise, if the <code title= "datagrid-cell-class-cyclable"><a href= "#cyclable">cyclable</a></code> class applies to the cell, it is a cycling cell whose value can be cycled between multiple states. Otherwise, none of these classes apply, and the cell is a simple text cell.</dd> <dt>To establish the value of a progress bar cell</dt> <dd>If the value <var title="">x</var> of the cell is a string that can be <a href="#rules1" title= "rules for parsing floating point number values">converted to a floating-point number</a> in the range 0.0 ≤  <var title= "">x</var>  ≤ 1.0, then the progress bar has that value (0.0 means no progress, 1.0 means complete). Otherwise, the progress bar is an indeterminate progress bar.</dd> <dt id="cellType2">To establish how a simple text cell should be presented</dt> <dd>Check whether one of the <code title= "datagrid-cell-class-checked"><a href="#checked">checked</a></code> , <code title="datagrid-cell-class-unchecked"><a href= "#unchecked">unchecked</a></code> , or <code title= "datagrid-cell-class-indeterminate"><a href= "#indeterminate">indeterminate</a></code> classes applies to the cell. If any of these are present, then the cell has a checkbox, otherwise none are present and the cell does not have a checkbox. If the cell has no checkbox, check whether the <code title= "datagrid-cell-class-editable"><a href= "#editable">editable</a></code> class applies to the cell. If it does, then the cell value is editable, otherwise the cell value is static.</dd> <dt>To establish the state of a cell's checkbox, if it has one</dt> <dd>Check whether the <code title= "datagrid-cell-class-checked"><a href="#checked">checked</a></code> class applies to the cell. If it does, the cell is checked. Otherwise, check whether the <code title= "datagrid-cell-class-unchecked"><a href= "#unchecked">unchecked</a></code> class applies to the cell. If it does, the cell is unchecked. Otherwise, the <code title= "datagrid-cell-class-indeterminate"><a href= "#indeterminate">indeterminate</a></code> class <del class= "diff-old">appplies</del> <ins class="diff-chg">applies</ins> to the cell and the cell's checkbox is in an indeterminate state. When the <code title="datagrid-cell-class-indeterminate"><a href= "#indeterminate">indeterminate</a></code> class <del class= "diff-old">appplies</del> <ins class="diff-chg">applies</ins> to the cell, the checkbox is a tristate checkbox, and the user can set it to the indeterminate state. Otherwise, only the <code title= "datagrid-cell-class-checked"><a href="#checked">checked</a></code> and/or <code title="datagrid-cell-class-unchecked"><a href= "#unchecked">unchecked</a></code> classes apply to the cell, and the cell can only be toggled <del class="diff-old">betwen</del> <ins class="diff-chg">between</ins> those two states.</dd> </dl> If the data provider ever raises an exception while the <code><a href="#datagrid0">datagrid</a></code> is invoking one of its methods, the <code><a href="#datagrid0">datagrid</a></code> must act, for the purposes of that particular method call, as if the relevant method had not been defined. A <code><a href="#rowspecification">RowSpecification</a></code> object <var title="">p</var> with <var title="">n</var> path components passed to a method of the data provider must fulfill the constraint 0 ≤  <var title="">p <var title="">i</var></var>  <  <var title= "">m</var> -1 for all integer values of <var title= "">i</var> in the range 0 ≤  <var title="">i</var>  <  <var title="">n</var> -1 , where <var title="">m</var> is the value that was last returned by the <code title="dom-provider-getRowCount"><a href= "#getrowcount">getRowCount()</a></code> method when it was passed the <code><a href="#rowspecification">RowSpecification</a></code> object <var title="">q</var> with <var title="">i</var> -1 items, where <var title="">p <var title="">i</var></var>  =  <var title="">q <var title="">i</var></var> for all integer values of <var title="">i</var> in the range 0 ≤  <var title="">i</var>  <  <var title="">n</var> -1 , with any changes implied by the update methods taken into account. The data model is considered stable: user agents may assume that subsequent calls to the data provider methods will return the same data, until one of the update methods is called on the <code><a href= "#datagrid0">datagrid</a></code> element. If a user agent is returned inconsistent data, for example if the number of rows returned by <code title="dom-provider-getRowCount"><a href= "#getrowcount">getRowCount()</a></code> varies in ways that do not match the calls made to the update methods, the user agent may disable the <code><a href="#datagrid0">datagrid</a></code> . User agents that do not disable the <code><a href= "#datagrid0">datagrid</a></code> in inconsistent cases must <del class="diff-old">honour</del> <ins class= "diff-chg">honor</ins> the most recently returned values. User agents may cache returned values so that the data provider is never asked for data that could contradict earlier data. User agents must not cache the return value of the <code title= "dom-provider-getRowMenu"><a href= "#getrowmenu">getRowMenu</a></code> method. The exact algorithm used to populate the data grid is not defined here, since it will differ based on the presentation used. However, the <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> of user agents must be consistent with the descriptions above. For example, it would be non-conformant for a user agent to make cells have both a checkbox and be editable, as the descriptions above state that cells that have a checkbox cannot be edited. <h5 id="updating"><del class= "diff-old">3.18.2.6.</del> <ins class= "diff-chg">3.16.2.6.</ins> Updating the <code><a href= "#datagrid0">datagrid</a></code></h5> Whenever the <code title="dom-datagrid-data"><a href= "#data2">data</a></code> attribute is set to a new value, the <code><a href="#datagrid0">datagrid</a></code> must clear the current selection, remove all the displayed rows, and plan to repopulate itself using the information from the new data provider at the earliest opportunity. There are a number of update methods that can be invoked on the <code><a href="#datagrid0">datagrid</a></code> element to cause it to refresh itself in slightly less drastic ways: When the <dfn id="updateeverything" title= "dom-datagrid-updateEverything"><code>updateEverything()</code></dfn> method is called, the user agent must repopulate the entire <code><a href="#datagrid0">datagrid</a></code> . If the number of rows decreased, the selection must be updated appropriately. If the number of rows increased, the new rows should be left unselected. When the <dfn id="updaterowschanged" title= "dom-datagrid-updateRowsChanged"><code>updateRowsChanged( <var title="">row</var> , <var title="">count</var> )</code></dfn> method is called, the user agent must refresh the rendering of the rows starting from the row specified by <var title="">row</var> , and including the <var title="">count</var> next siblings of the row (or as many next siblings as it has, if that is less than <var title="">count</var> ), including all descendant rows. When the <dfn id="updaterowsinserted" title= "dom-datagrid-updateRowsInserted"><code>updateRowsInserted( <var title="">row</var> , <var title="">count</var> )</code></dfn> method is called, the user agent must assume that <var title= "">count</var> new rows have been inserted, such that the first new row is <del class="diff-old">indentified</del> <ins class= "diff-chg">identified</ins> by <var title="">row</var> . The user agent must update its rendering and the selection accordingly. The new rows should not be selected. When the <dfn id="updaterowsremoved" title= "dom-datagrid-updateRowsRemoved"><code>updateRowsRemoved( <var title="">row</var> , <var title="">count</var> )</code></dfn> method is called, the user agent must assume that <var title= "">count</var> rows have been removed starting from the row that used to be identifier by <var title="">row</var> . The user agent must update its rendering and the selection accordingly. The <dfn id="updaterowchanged" title= "dom-datagrid-updateRowChanged"><code>updateRowChanged( <var title= "">row</var> )</code></dfn> method must be exactly equivalent to calling <code title="dom-datagrid-updateRowsChanged"><a href= "#updaterowschanged">updateRowsChanged( <var title="">row</var> , 1)</a></code> . When the <dfn id="updatecolumnchanged" title= "dom-datagrid-updateColumnChanged"><code>updateColumnChanged( <var title="">column</var> )</code></dfn> method is called, the user agent must refresh the rendering of the specified column <var title="">column</var> , for all rows. When the <dfn id="updatecellchanged" title= "dom-datagrid-updateCellChanged"><code>updateCellChanged( <var title="">row</var> , <var title="">column</var> )</code></dfn> method is called, the user agent must refresh the rendering of the cell on row <var title="">row</var> , in column <var title= "">column</var> . Any effects the update methods have on the <code><a href= "#datagrid0">datagrid</a></code> 's selection is not considered a change to the selection, and must therefore not fire the <code title="event-select"><a href="#select">select</a></code> event. These update methods should <del class="diff-old">only</del> be called <ins class="diff-new">only</ins> by the data provider, or code acting on behalf of the data provider. In particular, calling the <code title="dom-datagrid-updateRowsInserted"><a href= "#updaterowsinserted">updateRowsInserted()</a></code> and <code title="dom-datagrid-updateRowsRemoved"><a href= "#updaterowsremoved">updateRowsRemoved()</a></code> methods without actually inserting or removing rows from the data provider is <a href="#inconsistentDataProvider">likely to result in inconsistent renderings</a> , and the user agent is likely to disable the data grid. <h5 id="requirements"><del class= "diff-old">3.18.2.7.</del> <ins class= "diff-chg">3.16.2.7.</ins> Requirements for interactive user agents</h5> This section only applies to interactive user agents. If the <code><a href="#datagrid0">datagrid</a></code> element has a <dfn id="disabled3" title= "attr-datagrid-disabled"><code>disabled</code></dfn> attribute, then the user agent must disable the <code><a href= "#datagrid0">datagrid</a></code> , preventing the user from interacting with it. The <code><a href= "#datagrid0">datagrid</a></code> element should still continue to update itself when the data provider signals changes to the data, though. Obviously, conformance requirements stating that <code><a href="#datagrid0">datagrid</a></code> elements must react to users in particular ways do not apply when one is disabled. If <a href="#rowType1">a row is openable</a> , then the user should be able to toggle its open/closed state. When a row's open/closed state changes, the user agent must update the rendering to match the new state. If a cell is a cell whose value <a href="#cellType1">can be cycled between multiple states</a> , then the user must be able to activate the cell to cycle its value. When the user activates this "cycling" <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> of a cell, then the <code><a href= "#datagrid0">datagrid</a></code> must invoke the data provider's <code title="dom-provider-cycleCell"><a href= "#cyclecell">cycleCell()</a></code> method, with a <code><a href= "#rowspecification">RowSpecification</a></code> object representing the cell's row as the first argument and the cell's column index as the second. The <code><a href="#datagrid0">datagrid</a></code> must act as if the <code><a href="#datagrid0">datagrid</a></code> 's <code title="dom-datagrid-updateCellChanged"><a href= "#updatecellchanged">updateCellChanged()</a></code> method had been invoked with those same arguments immediately before the provider's method was invoked. When a cell <a href="#cellType2">has a checkbox</a> , the user must be able to set the checkbox's state. When the user changes the state of a checkbox in such a cell, the <code><a href= "#datagrid0">datagrid</a></code> must invoke the data provider's <code title="dom-provider-setCellCheckedState"><a href= "#setcellcheckedstate">setCellCheckedState()</a></code> method, with a <code><a href= "#rowspecification">RowSpecification</a></code> object representing the cell's row as the first argument, the cell's column index as the second, and the checkbox's new state as the third. The state should be represented by the number 1 if the new state is checked, 0 if the new state is unchecked, and <del class="diff-old">-1</del> <ins class="diff-chg">−1</ins> if the new state is indeterminate (which must <del class="diff-old">only</del> be possible <ins class="diff-new">only</ins> if the cell has the <code title= "datagrid-cell-class-indeterminate"><a href= "#indeterminate">indeterminate</a></code> class set). The <code><a href="#datagrid0">datagrid</a></code> must act as if the <code><a href="#datagrid0">datagrid</a></code> 's <code title= "dom-datagrid-updateCellChanged"><a href= "#updatecellchanged">updateCellChanged()</a></code> method had been invoked, specifying the same cell, immediately before the provider's method was invoked. If a cell <a href="#cellType2">is editable</a> , the user must be able to edit the data for that cell, and doing so must cause the user agent to invoke the <code title= "dom-provider-editCell"><a href="#editcell">editCell()</a></code> method of the data provider with three arguments: a <code><a href= "#rowspecification">RowSpecification</a></code> object representing the cell's row, the cell's column's index, and the new text entered by the user. The user agent must act as if the <code title= "dom-datagrid-updateCellChanged"><a href= "#updatecellchanged">updateCellChanged()</a></code> method had been invoked, with the same row and column specified, immediately before the provider's method was invoked. <h5 id="the-selection"><del class= "diff-old">3.18.2.8.</del> <ins class= "diff-chg">3.16.2.8.</ins> The selection</h5> This section only applies to interactive user agents. For other user agents, the <code title= "dom-datagrid-selection"><a href="#selection0">selection</a></code> attribute must return null. <pre class="idl"> interface <dfn id="datagridselection">DataGridSelection</dfn> { readonly attribute unsigned long length; <del class="diff-old"> (in unsigned long index); </del> <ins class="diff-chg"> [IndexGetter] <a href= "#rowspecification">RowSpecification</a> item(in unsigned long index); </ins> boolean <a href="#isselected" title= "dom-DataGridSelection-isSelected">isSelected</a>(in <a href= "#rowspecification">RowSpecification</a> row); void <a href="#setselected" title= "dom-DataGridSelection-setSelected">setSelected</a>(in <a href= "#rowspecification">RowSpecification</a> row, in boolean selected); void <a href="#selectall" title= "dom-DataGridSelection-selectAll">selectAll</a>(); void <a href="#invert" title= "dom-DataGridSelection-invert">invert</a>(); void <a href="#clear" title= "dom-DataGridSelection-clear">clear</a>(); }; </pre> Each <code><a href="#datagrid0">datagrid</a></code> element must keep track of which rows are currently selected. Initially no rows are selected, but this can be changed via the methods described in this section. The selection of a <code><a href= "#datagrid0">datagrid</a></code> is represented by its <dfn id= "selection0" title= "dom-datagrid-selection"><code>selection</code></dfn> DOM attribute, which must be a <code><a href= "#datagridselection">DataGridSelection</a></code> object. <code><a href="#datagridselection">DataGridSelection</a></code> objects represent the rows in the selection. In the selection the rows must be ordered in the natural order of the data provider (and not, e.g., the rendered order). Rows that are not rendered because one of their ancestors is closed must share the same selection state as their nearest rendered ancestor. Such rows are not considered part of the selection for the purposes of iterating over the selection. This selection API doesn't allow for hidden rows to be selected because it is trivial to create a data provider that has infinite depth, which would then require the selection to be infinite if every row, including every hidden row, was selected. The <dfn id="length5" title= "dom-DataGridSelection-length"><code>length</code></dfn> attribute must return the number of rows currently present in the selection. The <dfn id="itemindex3" title= "dom-DataGridSelection-item"><code>item( <var title="">index</var> )</code></dfn> method must return the <var title="">index</var> th row in the selection. If the argument is out of range (less than zero or greater than the number of selected rows minus one), then it must raise an <code>INDEX_SIZE_ERR</code> exception. <a href= "#references">[DOM3CORE]</a> The <dfn id="isselected" title= "dom-DataGridSelection-isSelected"><code>isSelected()</code></dfn> method must return the selected state of the row specified by its argument. If the specified row exists and is selected, it must return true, otherwise it must return false. The <dfn id="setselected" title= "dom-DataGridSelection-setSelected"><code>setSelected()</code></dfn> method takes two arguments, <var title="">row</var> and <var title= "">selected</var> . When invoked, it must set the selection state of row <var title="">row</var> to selected if <var title= "">selected</var> is true, and unselected if it is false. If <var title="">row</var> is not a row in the data grid, the method must raise an <code>INDEX_SIZE_ERR</code> exception. If the specified row is not rendered because one of its ancestors is closed, the method must do nothing. The <dfn id="selectall" title= "dom-DataGridSelection-selectAll"><code>selectAll()</code></dfn> method must mark all the rows in the data grid as selected. After a call to <code title="dom-DataGridSelection-selectAll"><a href= "#selectall">selectAll()</a></code> , the <code title= "dom-DataGridSelection-length"><a href="#length5">length</a></code> attribute will return the number of rows in the data grid, not counting children of closed rows. The <dfn id="invert" title= "dom-DataGridSelection-invert"><code>invert()</code></dfn> method must cause all the rows in the selection that were marked as selected to now be marked as not selected, and vice versa. The <dfn id="clear" title= "dom-DataGridSelection-clear"><code>clear()</code></dfn> method must mark all the rows in the data grid to be marked as not selected. After a call to <code title= "dom-DataGridSelection-clear"><a href="#clear">clear()</a></code> , the <code title="dom-DataGridSelection-length"><a href= "#length5">length</a></code> attribute will return zero. If the <code><a href="#datagrid0">datagrid</a></code> element has a <dfn id="multiple0" title= "attr-datagrid-multiple"><code>multiple</code></dfn> attribute, then the user must be able to select any number of rows (zero or more). If the attribute is not present, then the user must <del class="diff-old">only</del> <ins class="diff-chg">not</ins> be able to select <ins class="diff-new">more than</ins> a single row at a time, and selecting another one must unselect all the other rows. This only applies to the user. Scripts can select multiple rows even when the <code title= "attr-datagrid-multiple"><a href="#multiple0">multiple</a></code> attribute is absent. Whenever the selection of a <code><a href= "#datagrid0">datagrid</a></code> changes, whether due to the user interacting with the element, or as a result of calls to methods of the <code title="dom-datagrid-selection"><a href= "#selection0">selection</a></code> object, a <dfn id="select" title="event-select"><code>select</code></dfn> event that bubbles but is not cancelable must be fired on the <code><a href= "#datagrid0">datagrid</a></code> element. If changes are made to the selection via calls to the object's methods during the execution of a script, then the <code title="event-select"><a href= "#select">select</a></code> events must be coalesced into one, which must then be fired when the script execution has completed. The <code><a href= "#datagridselection">DataGridSelection</a></code> interface has no relation to the <code><a href="#selection1">Selection</a></code> interface. <h5 id="columns"><del class= "diff-old">3.18.2.9.</del> <ins class= "diff-chg">3.16.2.9.</ins> Columns and captions</h5> This section only applies to interactive user agents. Each <code><a href="#datagrid0">datagrid</a></code> element must keep track of which columns are currently being rendered. User agents should initially show all the columns except those with the <code title="datagrid-column-class-initially-hidden"><a href= "#initially-hidden">initially-hidden</a></code> class, but may allow users to hide or show columns. User agents should initially display the columns in the order given by the data provider, but may allow this order to be changed by the user. If columns are not being used, as might be the case if the data grid is being presented in an icon view, or if an overview of data is being read in an aural context, then the text of the first column of each row should be used to represent the row. If none of the columns have any captions (i.e. if the data provider does not provide a <code title= "dom-provider-getCaptionText"><a href= "#getcaptiontext">getCaptionText()</a></code> method), then user agents may avoid showing the column headers at all. This may prevent the user from performing actions on the columns (such as reordering them, changing the sort column, and so on). Whatever the order used for rendering, and irrespective of what columns are being shown or hidden, the "first column" as referred to in this specification is always the column with index zero, and the "last column" is always the column with the index one less than the value returned by the <code title= "dom-provider-getcolumnCount"><a href= "#getcolumncount">getColumnCount()</a></code> method of the data provider. If <a href="#columnType2">a column is sortable</a> , then the user must be able to invoke it to sort the data. When the user does so, then the <code><a href="#datagrid0">datagrid</a></code> must invoke the data provider's <code title= "dom-provider-toggleColumnSortState"><a href= "#togglecolumnsortstate">toggleColumnSortState()</a></code> method, with the column's index as the only argument. The <code><a href= "#datagrid0">datagrid</a></code> must then act as if the <code><a href="#datagrid0">datagrid</a></code> 's <code title= "dom-datagrid-updateEverything"><a href= "#updateeverything">updateEverything()</a></code> method had been invoked. <h4 id="the-command"><del class= "diff-old">3.18.3.</del> <ins class="diff-chg">3.16.3</ins> The <dfn id="command0"><code>command</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#metadata0">Metadata content</a> .</dd> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <a href="#metadata0">metadata content</a> is expected.</dd> <dd>Where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd>Empty.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-command-type"><a href= "#type13">type</a></code></dd> <dd><code title="attr-command-label"><a href= "#label">label</a></code></dd> <dd><code title="attr-command-icon"><a href= "#icon">icon</a></code></dd> <dd><code title="attr-command-hidden"><a href= "#hidden">hidden</a></code></dd> <dd><code title="attr-command-disabled"><a href= "#disabled4">disabled</a></code></dd> <dd><code title="attr-command-checked"><a href= "#checked0">checked</a></code></dd> <dd><code title="attr-command-radiogroup"><a href= "#radiogroup">radiogroup</a></code></dd> <dd><code title="attr-command-default"><a href= "#default1">default</a></code></dd> <dd>Also, the <code title="attr-command-title"><a href= "#title6">title</a></code> attribute has special semantics on this element.</dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlcommandelement">HTMLCommandElement</dfn> : <a href= "#htmlelement">HTMLElement</a> { attribute DOMString <a href="#type14" title= "dom-command-type">type</a>; attribute DOMString <a href="#label0" title= "dom-command-label">label</a>; attribute DOMString <a href="#icon0" title= "dom-command-icon">icon</a>; attribute boolean <a href="#hidden0" title= "dom-command-hidden">hidden</a>; attribute boolean <a href="#disabled5" title= "dom-command-disabled">disabled</a>; attribute boolean <a href="#checked1" title= "dom-command-checked">checked</a>; attribute DOMString <a href="#radiogroup0" title= "dom-command-radiogroup">radiogroup</a>; attribute boolean <a href="#default2" title= "dom-command-default">default</a>; void <a href="#click0" title= "dom-command-click">click</a>(); // shadows <code><a href= "#htmlelement">HTMLElement</a></code>.<code title= "dom-click"><a href="#click">click()</a></code> }; </pre> The <code title="command-ro"><a href= "#command2">Command</a></code> interface must also be implemented by this element. </dd> </dl> The <code><a href="#command0">command</a></code> element represents a command that the user can invoke. The <dfn id="type13" title= "attr-command-type"><code>type</code></dfn> attribute indicates the kind of command: either a normal command with an associated action, or a state or option that can be toggled, or a selection of one item from a list of items. The attribute's value must be either " <code title= "">command</code> ", " <code title="">checkbox</code> ", or " <code title="">radio</code> ", denoting each of these three types of commands respectively. The attribute may also be omitted if the element is to represent the first of these types, a simple command. The <dfn id="label" title= "attr-command-label"><code>label</code></dfn> attribute gives the name of the command, as shown to the user. The <dfn id="title6" title= "attr-command-title"><code>title</code></dfn> attribute gives a hint describing the command, which might be shown to the user to help him. The <dfn id="icon" title= "attr-command-icon"><code>icon</code></dfn> attribute gives a picture that represents the command. If the attribute is specified, the attribute's value must contain a URI (or IRI). The <dfn id="hidden" title= "attr-command-hidden"><code>hidden</code></dfn> attribute is a <a href="#boolean0">boolean attribute</a> that, if present, indicates that the command is not relevant and is to be hidden. The <dfn id="disabled4" title= "attr-command-disabled"><code>disabled</code></dfn> attribute is a <a href="#boolean0">boolean attribute</a> that, if present, indicates that the command is not available in the current state. The distinction between <a href="#disabled6" title= "command-facet-DisabledState">Disabled State</a> and <a href= "#hidden1" title="command-facet-HiddenState">Hidden State</a> is subtle. A command should be Disabled if, in the same context, it could be enabled if only certain aspects of the situation were changed. A command should be marked as Hidden if, in that situation, the command will never be enabled. For example, in the context menu for a water faucet, the command "open" might be Disabled if the faucet is already open, but the command "eat" would be marked Hidden since the faucet could never be eaten. The <dfn id="checked0" title= "attr-command-checked"><code>checked</code></dfn> attribute is a <a href="#boolean0">boolean attribute</a> that, if present, indicates that the command is selected. The <dfn id="radiogroup" title= "attr-command-radiogroup"><code>radiogroup</code></dfn> attribute gives the name of the group of commands that will be toggled when the command itself is toggled, for commands whose <code title= "attr-command-type"><a href="#type13">type</a></code> attribute has the value " <code title="">radio</code> ". The scope of the name is the child list of the parent element. If the <code><a href="#command0">command</a></code> element is used when generating a context menu , then the <dfn id="default1" title= "attr-command-default"><code>default</code></dfn> attribute indicates, if present, that the command is the one that would have been invoked if the user had directly activated the menu's subject instead of using its context menu. The <code title= "attr-command-default"><a href="#default1">default</a></code> attribute is a <a href="#boolean0">boolean attribute</a> . <div class="example"> Need an example that shows an element that, if double-clicked, invokes an action, but that also has a context menu, showing the various <code><a href= "#command0">command</a></code> attributes off, and that has a default command. </div> The <dfn id="type14" title= "dom-command-type"><code>type</code></dfn> , <dfn id="label0" title="dom-command-label"><code>label</code></dfn> , <dfn id= "icon0" title="dom-command-icon"><code>icon</code></dfn> , <dfn id= "hidden0" title="dom-command-hidden"><code>hidden</code></dfn> , <dfn id="disabled5" title= "dom-command-disabled"><code>disabled</code></dfn> , <dfn id= "checked1" title="dom-command-checked"><code>checked</code></dfn> , <dfn id="radiogroup0" title= "dom-command-radiogroup"><code>radiogroup</code></dfn> , and <dfn id="default2" title= "dom-command-default"><code>default</code></dfn> DOM attributes must <a href="#reflect">reflect</a> their respective namesake content attributes. The <dfn id="click0" title= "dom-command-click"><code>click()</code></dfn> method's <del class= "diff-old">behaviour</del> <ins class="diff-chg">behavior</ins> depends on the value of the <code title= "attr-command-type"><a href="#type13">type</a></code> attribute of the element, as follows: <dl class="switch"> <dt>If the <code title="attr-command-type"><a href= "#type13">type</a></code> attribute has the value <code title= "">checkbox</code></dt> <dd> If the element has a <code title="attr-command-checked"><a href= "#checked0">checked</a></code> attribute, the UA must remove that attribute. Otherwise, the UA must add a <code title= "attr-command-checked"><a href="#checked0">checked</a></code> attribute, with the literal value <code title="">checked</code> . The UA must then <a href="#firing">fire a <code title= "">click</code> event</a> at the element. </dd> <dt>If the <code title="attr-command-type"><a href= "#type13">type</a></code> attribute has the value <code title= "">radio</code></dt> <dd> If the element has a parent, then the UA must walk the list of child nodes of that parent element, and for each node that is a <code><a href="#command0">command</a></code> element, if that element has a <code title="attr-command-radiogroup"><a href= "#radiogroup">radiogroup</a></code> attribute whose value exactly matches the current element's (treating missing <code title= "attr-command-radiogroup"><a href= "#radiogroup">radiogroup</a></code> attributes as if they were the empty string), and has a <code title= "attr-command-checked"><a href="#checked0">checked</a></code> attribute, must remove that attribute and <a href="#firing">fire a <code title="">click</code> event</a> at the element. Then, the element's <code title="attr-command-checked"><a href= "#checked0">checked</a></code> attribute attribute must be set to the literal value <code title="">checked</code> and a <code title="">click</code> event must be fired at the element. </dd> <dt>Otherwise</dt> <dd> The UA must <a href="#firing">fire a <code title="">click</code> event</a> at the element. </dd> </dl> Firing a synthetic <code title= "event-click">click</code> event at the element does not cause any of the actions described above to happen. should change all the above so it actually is just <del class="diff-old">trigged</del> <ins class= "diff-chg">triggered</ins> by a click event, then we could remove the shadowing click() method and rely on actual events. Need to define the command="" attribute <code><a href="#command0">command</a></code> elements are not rendered unless they <a href="#menu" title= "menu">form part of a menu</a> . <h4 id="menus"><del class= "diff-old">3.18.4.</del> <ins class="diff-chg">3.16.4</ins> The <dfn id="menu"><code>menu</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dd>If there is a <code><a href="#menu">menu</a></code> element ancestor: <a href="#phrasing0">phrasing content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dd>If there is a <code><a href="#menu">menu</a></code> element ancestor: where <a href="#phrasing0">phrasing content</a> is expected.</dd> <dt>Content model:</dt> <dd>Either: Zero or more <code><a href="#li">li</a></code> elements.</dd> <dd>Or: <a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-menu-type"><a href= "#type15">type</a></code></dd> <dd><code title="attr-menu-label"><a href= "#label1">label</a></code></dd> <dd><code title="attr-menu-autosubmit"><a href= "#autosubmit">autosubmit</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlmenuelement">HTMLMenuElement</dfn> : <a href="#htmlelement">HTMLElement</a> { attribute DOMString type; attribute DOMString label; attribute boolean autosubmit; }; </pre></dd> </dl> The <code><a href="#menu">menu</a></code> element represents a list of commands. The <dfn id="type15" title= "attr-menu-type"><code>type</code></dfn> attribute is an <a href= "#enumerated">enumerated attribute</a> indicating the kind of menu being declared. The attribute has three states. The <code title= "attr-menu-type-context">context</code> keyword maps to the <dfn id="context1" title="context menu state">context menu</dfn> state, in which the element is declaring a context menu. The <code title="attr-menu-type-toolbar">toolbar</code> keyword maps to the <dfn id="tool-bar" title="tool bar state">tool bar</dfn> state, in which the element is <del class="diff-old">declaraing</del> <ins class="diff-chg">declaring</ins> a tool bar. The attribute may also be omitted. The missing value default is the <dfn id= "list" title="list state">list</dfn> state, which indicates that the element is merely a list of commands that is neither declaring a context menu nor defining a tool bar. If a <code><a href="#menu">menu</a></code> element's <code title="attr-menu-type"><a href="#type15">type</a></code> attribute is in the <a href="#context1" title= "context menu state">context menu</a> state, then the element represents the commands of a context menu, and the user can only interact with the commands if that context menu is activated. If a <code><a href="#menu">menu</a></code> element's <code title="attr-menu-type"><a href="#type15">type</a></code> attribute is in the <a href="#tool-bar" title="tool bar state">tool bar</a> state, then the element represents a list of active commands that the user can immediately interact with. If a <code><a href="#menu">menu</a></code> element's <code title="attr-menu-type"><a href="#type15">type</a></code> attribute is in the <a href="#list" title="list state">list</a> state, then the element either represents an unordered list of items (each represented by an <code><a href="#li">li</a></code> element), each of which represents a command that the user may perform or activate, or, if the element has no <code><a href= "#li">li</a></code> element children, <del class= "diff-old">prose</del> <a href="#flow-content0"><ins class= "diff-chg">flow</ins> content</a> describing available commands. The <dfn id="label1" title= "attr-menu-label"><code>label</code></dfn> attribute gives the label of the menu. It is used by user agents to display nested menus in the UI. For example, a context menu containing another menu would use the nested menu's <code title= "attr-menu-label"><a href="#label1">label</a></code> attribute for the submenu's menu label. The <dfn id="autosubmit" title= "attr-menu-autosubmit"><code>autosubmit</code></dfn> attribute is a <a href="#boolean0">boolean attribute</a> that, if present, indicates that selections made to form controls in this menu are to result in the control's form being immediately submitted. If a <code title="event-change">change</code> event bubbles through a <code><a href="#menu">menu</a></code> element, then, in addition to any other default action that that event might have, the UA must act as if the following was an additional default action for that event: if (when it comes time to execute the default action) the <code><a href="#menu">menu</a></code> element has an <code title="attr-menu-autosubmit"><a href= "#autosubmit">autosubmit</a></code> attribute, and the target of the event is an <code>input</code> element, and that element has a <code title="attr-input-type">type</code> attribute whose value is either <code title="">radio</code> or <code title= "">checkbox</code> , and the <code>input</code> element in question has a non-null <code title="dom-input-form">form</code> DOM attribute, then the UA must invoke the <code title= "dom-form-submit">submit()</code> method of the <code>form</code> element indicated by that DOM attribute. <h5 id="menus-intro"><del class= "diff-old">3.18.4.1.</del> <ins class= "diff-chg">3.16.4.1.</ins> Introduction</h5> This section is non-normative. ... <h5 id="building"><del class= "diff-old">3.18.4.2.</del> <ins class= "diff-chg">3.16.4.2.</ins> <dfn id="building0">Building menus and tool bars</dfn></h5> A menu (or tool bar) consists of a list of zero or more of the following components: <ul class="brief"> <li><a href="#command1" title="concept-command">Commands</a> , which can be marked as default commands</li> <li>Separators</li> <li>Other menus (which allows the list to be nested)</li> </ul> The list corresponding to a particular <code><a href= "#menu">menu</a></code> element is built by iterating over its child nodes. For each child node in <a href="#tree-order">tree order</a> , the required <del class="diff-old">behaviour</del> <ins class="diff-chg">behavior</ins> depends on what the node is, as follows: <dl class="switch"> <dt>An element that <a href="#command1" title= "concept-command">defines a command</a></dt> <dd>Append the command to the menu. If the element is a <code><a href="#command0">command</a></code> element with a <code title="attr-command-default"><a href= "#default1">default</a></code> attribute, mark the command as being a default command.</dd> <dt>An <code><a href="#hr">hr</a></code> element</dt> <dt>An <code>option</code> element that has a <code title= "attr-option-value">value</code> attribute set to the empty string, and has a <code title="attr-option-disabled">disabled</code> attribute, and whose <code><a href= "#textcontent">textContent</a></code> consists of a string of one or more hyphens (U+002D HYPHEN-MINUS)</dt> <dd>Append a separator to the menu.</dd> <dt>An <code><a href="#li">li</a></code> element</dt> <dd>Iterate over the children of the <code><a href= "#li">li</a></code> element.</dd> <dt>A <code><a href="#menu">menu</a></code> element with no <code title="attr-menu-label"><a href="#label1">label</a></code> attribute</dt> <dt>A <code>select</code> element</dt> <dd>Append a separator to the menu, then iterate over the children of the <code><a href="#menu">menu</a></code> or <code>select</code> element, then append another separator.</dd> <dt>A <code><a href="#menu">menu</a></code> element with a <code title="attr-menu-label"><a href="#label1">label</a></code> attribute</dt> <dt>An <code>optgroup</code> element</dt> <dd>Append a submenu to the menu, using the value of the element's <code title="">label</code> attribute as the label of the menu. The submenu must be constructed by taking the element and creating a new menu for it using the complete process described in this section.</dd> <dt>Any other node</dt> <dd><a href="#ignored">Ignore</a> the node.</dd> </dl> We should support <code>label</code> in the algorithm above -- just iterate through the contents like with <code><a href="#li">li</a></code> , to support <code>input</code> elements in <code>label</code> elements. Also, <code>optgroup</code> elements without labels should be ignored (maybe? or at least should say they have no label so that they are dropped below), and <code>select</code> elements inside <code>label</code> elements may need special processing. Once all the nodes have been processed as described above, the user agent must the post-process the menu as follows: <ol> <li>Any menu item with no label, or whose label is the empty string, must be removed.</li> <li>Any sequence of two or more separators in a row must be collapsed to a single separator.</li> <li>Any separator at the start or end of the menu must be removed.</li> </ol> <h5 id="context"><del class= "diff-old">3.18.4.3.</del> <ins class= "diff-chg">3.16.4.3.</ins> <dfn id="context2">Context menus</dfn></h5> The <dfn id="contextmenu" title= "attr-contextmenu"><code>contextmenu</code></dfn> attribute gives the element's <a href="#context2" title="context menus">context menu</a> . The value must be the ID of a <code><a href= "#menu">menu</a></code> element in the DOM. If the node that would be obtained by the invoking the <code>getElementById()</code> method using the attribute's value as the only argument is null or not a <code><a href="#menu">menu</a></code> element, then the element has no assigned context menu. Otherwise, the element's assigned context menu is the element so identified. When an element's context menu is requested (e.g. by the user right-clicking the element, or pressing a context menu key), the UA must <a href="#firing1">fire a <code title="">contextmenu</code> event</a> on the element for which the menu was requested. Typically, therefore, the firing of the <code title="event-contextmenu">contextmenu</code> event will be the default action of a <code title="mouseup">mouseup</code> or <code title="event-keyup">keyup</code> event. The exact sequence of events is UA-dependent, as it will vary based on platform conventions. The default action of the <code title= "event-contextmenu">contextmenu</code> event depends on whether the element has a context menu assigned (using the <code title= "attr-contextmenu"><a href="#contextmenu">contextmenu</a></code> attribute) or not. If it does not, the default action must be for the user agent to show its default context menu, if it has one. <ins class="diff-new">Context menus should inherit (so clicking on a span in a paragraph with a context menu should show the menu).</ins> If the element does have a context menu assigned, then the user agent must <a href="#firing3">fire a <code title= "">show</code> event</a> on the relevant <code><a href= "#menu">menu</a></code> element. The default action of this event is that the user agent must show a context menu <a href="#building0" title= "building menus and tool bars">built</a> from the <code><a href= "#menu">menu</a></code> element. The user agent may also provide access to its default context menu, if any, with the context menu shown. For example, it could merge the menu items from the two menus together, or provide the page's context menu as a submenu of the default menu. If the user dismisses the menu without making a selection, nothing in particular happens. If the user selects a menu item that represents a command , then the UA must invoke that command's <a href="#action" title="command-facet-Action">Action</a> . Context menus must not, while being shown, reflect changes in the DOM; they are constructed as the default action of the <code title="event-show">show</code> event and must remain like that until dismissed. User agents may provide means for bypassing the context menu processing model, ensuring that the user can always access the UA's default context menus. For example, the user agent could handle right-clicks that have the Shift key depressed in such a way that it does not fire the <code title= "event-contextmenu">contextmenu</code> event and instead always shows the default context menu. The <dfn id="contextmenu0" title= "dom-contextMenu"><code>contextMenu</code></dfn> attribute must <a href="#reflect">reflect</a> the <code title= "attr-contextmenu"><a href="#contextmenu">contextmenu</a></code> content attribute. <h5 id="toolbars"><del class= "diff-old">3.18.4.4.</del> <ins class= "diff-chg">3.16.4.4.</ins> Toolbars</h5> <dfn id="toolbars0">Toolbars</dfn> are a kind of menu that is always visible. When a <code><a href="#menu">menu</a></code> element has a <code title="attr-menu-type"><a href="#type15">type</a></code> attribute with the value <code title="">toolbar</code> , then the user agent must <a href="#building0" title= "building menus and tool bars">build</a> the menu for that <code><a href="#menu">menu</a></code> element and render it in the document in a position appropriate for that <code><a href="#menu">menu</a></code> element. The user agent must reflect changes made to the <code><a href= "#menu">menu</a></code> 's DOM immediately in the UI. <h4 id="commands"><del class= "diff-old">3.18.5.</del> <ins class="diff-chg">3.16.5</ins> Commands</h4> A <dfn id="command1" title="concept-command">command</dfn> is the abstraction behind menu items, buttons, and links. Once a command is defined, other parts of the interface can refer to the same command, allowing many access points to a single feature to share aspects such as the disabled state. Commands are defined to have the following facets : <dl> <dt><dfn id="type16" title="command-facet-Type">Type</dfn></dt> <dd>The kind of command: "command", meaning it is a normal command; "radio", meaning that triggering the command will, amongst other things, set the <a href="#checked2" title= "command-facet-CheckedState">Checked State</a> to true (and probably uncheck some other commands); or "checkbox", meaning that triggering the command will, amongst other things, toggle the value of the <a href="#checked2" title= "command-facet-CheckedState">Checked State</a> .</dd> <dt><dfn id="id1" title="command-facet-ID">ID</dfn></dt> <dd>The name of the command, for referring to the command from the markup or from script. If a command has no ID, it is an <dfn id= "anonymous">anonymous command</dfn> .</dd> <dt><dfn id="label2" title="command-facet-Label">Label</dfn></dt> <dd>The name of the command as seen by the user.</dd> <dt><dfn id="hint" title="command-facet-Hint">Hint</dfn></dt> <dd>A helpful or descriptive string that can be shown to the user.</dd> <dt><dfn id="icon1" title="command-facet-Icon">Icon</dfn></dt> <dd>A graphical image that represents the action.</dd> <dt><dfn id="hidden1" title="command-facet-HiddenState">Hidden State</dfn></dt> <dd>Whether the command is hidden or not (basically, whether it should be shown in menus).</dd> <dt><dfn id="disabled6" title= "command-facet-DisabledState">Disabled State</dfn></dt> <dd>Whether the command can be triggered or not. If the <a href= "#hidden1" title="command-facet-HiddenState">Hidden State</a> is true (hidden) then the <a href="#disabled6" title= "command-facet-DisabledState">Disabled State</a> will be true (disabled) regardless. We could make this into a string value that acts as a Hint for why the command is disabled.</dd> <dt><dfn id="checked2" title="command-facet-CheckedState">Checked State</dfn></dt> <dd>Whether the command is checked or not.</dd> <dt><dfn id="action" title="command-facet-Action">Action</dfn></dt> <dd>The actual effect that triggering the command will have. This could be a scripted event handler, a URI to which to navigate, or a form submission.</dd> <dt><dfn id="triggers" title= "command-facet-Triggers">Triggers</dfn></dt> <dd>The list of elements that can trigger the command. The element defining a command is always in the list of elements that can trigger the command. For anonymous commands, only the element defining the command is on the list, since other elements have no way to refer to it.</dd> </dl> Commands are represented by elements in the DOM. Any element that can define a command also implements the <code title= "command-ro"><a href="#command2">Command</a></code> interface: <ins class="diff-new">Actually even better would be to just mix it straight into those interfaces somehow.</ins> <pre> <del class="diff-old"> class=idl>interface { </del> <ins class= "diff-chg"> class=idl>[NoInterfaceObject] interface <dfn id= "command2" title="command-ro">Command</dfn> { </ins> readonly attribute DOMString <a href="#commandtype" title= "dom-command-ro-commandType">commandType</a>; readonly attribute DOMString <a href="#id2" title= "dom-command-ro-id">id</a>; readonly attribute DOMString <a href="#label3" title= "dom-command-ro-label">label</a>; readonly attribute DOMString <a href="#title7" title= "dom-command-ro-title">title</a>; readonly attribute DOMString <a href="#icon2" title= "dom-command-ro-icon">icon</a>; readonly attribute boolean <a href="#hidden2" title= "dom-command-ro-hidden">hidden</a>; readonly attribute boolean <a href="#disabled7" title= "dom-command-ro-disabled">disabled</a>; readonly attribute boolean <a href="#checked3" title= "dom-command-ro-checked">checked</a>; void <a href="#click1" title="dom-command-ro-click">click</a>(); readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#triggers0" title= "dom-command-ro-triggers">triggers</a>; readonly attribute <a href="#command0">Command</a> command; }; </pre> The <code title="command-ro"><a href= "#command2">Command</a></code> interface is implemented by any element capable of defining a command. (If an element can define a command, its definition will list this interface explicitly.) All the attributes of the <code title="command-ro"><a href= "#command2">Command</a></code> interface are read-only. Elements implementing this interface may implement other interfaces that have attributes with identical names but that are mutable; in bindings that <del class="diff-old">simply</del> flatten all supported interfaces on the object, the mutable attributes must shadow the readonly attributes defined in the <code title= "command-ro"><a href="#command2">Command</a></code> interface. The <dfn id="commandtype" title= "dom-command-ro-commandType"><code>commandType</code></dfn> attribute must return a string whose value is either " <code title= "">command</code> ", " <code title="">radio</code> ", or " <code title="">checked</code> ", depending on whether the <a href= "#type16" title="command-facet-Type">Type</a> of the command defined by the element is "command", "radio", or "checked" respectively. If the element does not define a command, it must return null. The <dfn id="id2" title= "dom-command-ro-id"><code>id</code></dfn> attribute must return the command's <a href="#id1" title="command-facet-ID">ID</a> , or null if the element does not define a command or defines an <a href= "#anonymous">anonymous command</a> . This attribute will be shadowed by the <code title="dom-id"><a href="#id0">id</a></code> DOM attribute on the <code><a href= "#htmlelement">HTMLElement</a></code> interface. The <dfn id="label3" title= "dom-command-ro-label"><code>label</code></dfn> attribute must return the command's <a href="#label2" title= "command-facet-Label">Label</a> , or null if the element does not define a command or does not specify a <a href="#label2" title= "command-facet-Label">Label</a> . This attribute will be shadowed by the <code title="">label</code> DOM attribute on <code>option</code> and <code><a href= "#command0">command</a></code> elements. The <dfn id="title7" title= "dom-command-ro-title"><code>title</code></dfn> attribute must return the command's <a href="#hint" title= "command-facet-Hint">Hint</a> , or null if the element does not define a command or does not specify a <a href="#hint" title= "command-facet-Hint">Hint</a> . This attribute will be shadowed by the <code title="dom-title"><a href="#title0">title</a></code> DOM attribute on the <code><a href= "#htmlelement">HTMLElement</a></code> interface. The <dfn id="icon2" title= "dom-command-ro-icon"><code>icon</code></dfn> attribute must return an absolute URI to the command's <a href="#icon1" title= "command-facet-Icon">Icon</a> . If the element does not specify an icon, or if the element does not define a command, then the attribute must return null. This attribute will be shadowed by the <code title="dom-command-icon"><a href="#icon0">icon</a></code> DOM attribute on <code><a href="#command0">command</a></code> elements. The <dfn id="hidden2" title= "dom-command-ro-hidden"><code>hidden</code></dfn> attribute must return true if the command's <a href="#hidden1" title= "command-facet-HiddenState">Hidden State</a> is that the command is hidden, and false if it is that the command is not hidden. If the element does not define a command, the attribute must return false. This attribute will be shadowed by the <code title= "dom-command-hidden"><a href="#hidden0">hidden</a></code> DOM attribute on <code><a href="#command0">command</a></code> elements. The <dfn id="disabled7" title= "dom-command-ro-disabled"><code>disabled</code></dfn> attribute must return true if the command's <a href="#disabled6" title= "command-facet-DisabledState">Disabled State</a> is that the command is disabled, and false if the command is not disabled. This attribute is not affected by the command's <a href="#hidden1" title="command-facet-HiddenState">Hidden State</a> . If the element does not define a command, the attribute must return false. This attribute will be shadowed by the <code title="">disabled</code> attribute on <code>button</code> , <code>input</code> , <code>option</code> , and <code><a href= "#command0">command</a></code> elements. The <dfn id="checked3" title= "dom-command-ro-checked"><code>checked</code></dfn> attribute must return true if the command's <a href="#checked2" title= "command-facet-CheckedState">Checked State</a> is that the command is checked, and false if it is that the command is not checked. If the element does not define a command, the attribute must return false. This attribute will be shadowed by the <code title= "">checked</code> attribute on <code>input</code> and <code><a href="#command0">command</a></code> elements. The <dfn id="click1" title= "dom-command-ro-click"><code>click()</code></dfn> method must trigger the <a href="#action" title= "command-facet-Action">Action</a> for the command. If the element does not define a command, this method must do nothing. This method will be shadowed by the <code title="dom-click"><a href= "#click">click()</a></code> method on <a href="#html-elements">HTML elements</a> , and is included only for completeness. The <dfn id="triggers0" title= "dom-command-ro-triggers"><code>triggers</code></dfn> attribute must return a list containing the elements that can trigger the command (the command's <a href="#triggers" title= "command-facet-Triggers">Triggers</a> ). The list must be <a href= "#live">live</a> . While the element does not define a command, the list must be empty. The <dfn id="commands0" title= "dom-document-commands"><code>commands</code></dfn> attribute of the document's <code><a href= "#htmldocument">HTMLDocument</a></code> interface must return an <code><a href="#htmlcollection0">HTMLCollection</a></code> rooted at the <code>Document</code> node, whose filter matches only elements that define commands and have IDs. The following elements can define commands: <code title= "a-command"><a href="#using4">a</a></code> , <code title= "button-command"><a href="#using5">button</a></code> , <code title= "input-command"><a href="#using6">input</a></code> , <code title= "option-command"><a href="#using7">option</a></code> , <code title= "command-element"><a href="#command3">command</a></code> . <h5 id="using"><del class= "diff-old">3.18.5.1.</del> <ins class= "diff-chg">3.16.5.1.</ins> <dfn id="using4" title= "a-command">Using the <code>a</code> element to define a command</dfn></h5> An <code><a href="#a">a</a></code> element with an <code title= "attr-hyperlink-href"><a href="#href6">href</a></code> attribute <a href="#command1" title="concept-command">defines a command</a> . The <a href="#type16" title="command-facet-Type">Type</a> of the command is "command". The <a href="#id1" title="command-facet-ID">ID</a> of the command is the value of the <code title="attr-id"><a href= "#id">id</a></code> attribute of the element, if the attribute is present and not empty. Otherwise the command is an <a href= "#anonymous">anonymous command</a> . The <a href="#label2" title="command-facet-Label">Label</a> of the command is the string given by the element's <code><a href= "#textcontent">textContent</a></code> DOM attribute. The <a href="#hint" title="command-facet-Hint">Hint</a> of the command is the value of the <code title="attr-title"><a href= "#title">title</a></code> attribute of the <code><a href= "#a">a</a></code> element. If the attribute is not present, the <a href="#hint" title="command-facet-Hint">Hint</a> is the empty string. The <a href="#icon1" title="command-facet-Icon">Icon</a> of the command is the absolute URI of the first image in the element. Specifically, in a depth-first search of the children of the element, the first element that is <code><a href= "#img">img</a></code> element with a <code>src</code> attribute is the one that is used as the image. The URI must be taken from the element's <code>src</code> attribute. Relative URIs must be resolved relative to the <a href="#elements2" title= "element's base URI">base URI</a> of the image element. If no image is found, then the Icon facet is left blank. The <a href="#hidden1" title="command-facet-HiddenState">Hidden State</a> and <a href="#disabled6" title= "command-facet-DisabledState">Disabled State</a> facets of the command are always false. (The command is always enabled.) The <a href="#checked2" title= "command-facet-CheckedState">Checked State</a> of the command is always false. (The command is never checked.) The <a href="#action" title="command-facet-Action">Action</a> of the command is to <a href="#firing" title="fire a click event">fire a <code title="">click</code> event</a> at the element. <h5 id="using0"><del class= "diff-old">3.18.5.2.</del> <ins class= "diff-chg">3.16.5.2.</ins> <dfn id="using5" title= "button-command">Using the <code>button</code> element to define a command</dfn></h5> A <code>button</code> element always <a href="#command1" title= "concept-command">defines a command</a> . The <a href="#type16" title="command-facet-Type">Type</a> , <a href="#id1" title="command-facet-ID">ID</a> , <a href="#label2" title="command-facet-Label">Label</a> , <a href="#hint" title= "command-facet-Hint">Hint</a> , <a href="#icon1" title= "command-facet-Icon">Icon</a> , <a href="#hidden1" title= "command-facet-HiddenState">Hidden State</a> , <a href="#checked2" title="command-facet-CheckedState">Checked State</a> , and <a href= "#action" title="command-facet-Action">Action</a> facets of the command are determined <a href="#using4" title="a-command">as for <code>a</code> elements</a> (see the previous section). The <a href="#disabled6" title= "command-facet-DisabledState">Disabled State</a> of the command mirrors the disabled state of the button. Typically this is given by the element's <code title="attr-button-disabled">disabled</code> attribute, but certain button types become disabled at other times too (for example, the <code>move-up</code> button type is disabled when it would have no effect). <h5 id="using1"><del class= "diff-old">3.18.5.3.</del> <ins class= "diff-chg">3.16.5.3.</ins> <dfn id="using6" title= "input-command">Using the <code>input</code> element to define a command</dfn></h5> An <code>input</code> element whose <code title= "attr-input-type">type</code> attribute is one of <code>submit</code> , <code>reset</code> , <code>button</code> , <code>radio</code> , <code>checkbox</code> , <code>move-up</code> , <code>move-down</code> , <code>add</code> , and <code>remove</code> <a href="#command1" title="concept-command">defines a command</a> . The <a href="#type16" title="command-facet-Type">Type</a> of the command is "radio" if the <code title="attr-input-type">type</code> attribute has the value <code>radio</code> , "checkbox" if the <code>type</code> attribute has the value <code>checkbox</code> , and "command" otherwise. The <a href="#id1" title="command-facet-ID">ID</a> of the command is the value of the <code title="attr-id"><a href= "#id">id</a></code> attribute of the element, if the attribute is present and not empty. Otherwise the command is an <a href= "#anonymous">anonymous command</a> . The <a href="#label2" title="command-facet-Label">Label</a> of the command depends on the Type of the command: If the <a href="#type16" title="command-facet-Type">Type</a> is "command", then it is the string given by the <code title= "attr-input-value">value</code> attribute, if any, and a UA-dependent value that the UA uses to label the button itself if the attribute is absent. Otherwise, the <a href="#type16" title= "command-facet-Type">Type</a> is "radio" or "checkbox". If the element has a <code>label</code> element associated with it, the <code><a href="#textcontent">textContent</a></code> of the first such element is the <a href="#label2" title= "command-facet-Label">Label</a> (in DOM terms, this the string given by <code><var title="">element</var> .labels[0].textContent</code> ). Otherwise, the value of the <code>value</code> attribute, if present, is the <a href="#label2" title="command-facet-Label">Label</a> . Otherwise, the <a href= "#label2" title="command-facet-Label">Label</a> is the empty string. The <a href="#hint" title="command-facet-Hint">Hint</a> of the command is the value of the <code title="attr-title"><a href= "#title">title</a></code> attribute of the <code>input</code> element. If the attribute is not present, the <a href="#hint" title="command-facet-Hint">Hint</a> is the empty string. There is no <a href="#icon1" title="command-facet-Icon">Icon</a> for the command. The <a href="#hidden1" title="command-facet-HiddenState">Hidden State</a> of the command is always false. (The command is never hidden.) The <a href="#disabled6" title= "command-facet-DisabledState">Disabled State</a> of the command mirrors the disabled state of the control. Typically this is given by the element's <code title="attr-input-disabled">disabled</code> attribute, but certain input types become disabled at other times too (for example, the <code>move-up</code> input type is disabled when it would have no effect). The <a href="#checked2" title= "command-facet-CheckedState">Checked State</a> of the command is true if the command is of <a href="#type16" title= "command-facet-Type">Type</a> "radio" or "checkbox" and the element has a <code title="attr-input-checked">checked</code> attribute, and false otherwise. The <a href="#action" title="command-facet-Action">Action</a> of the command is to <a href="#firing" title="fire a click event">fire a <code title="">click</code> event</a> at the element. <h5 id="using2"><del class= "diff-old">3.18.5.4.</del> <ins class= "diff-chg">3.16.5.4.</ins> <dfn id="using7" title= "option-command">Using the <code>option</code> element to define a command</dfn></h5> An <code>option</code> element with an ancestor <code>select</code> element and either no <code title= "attr-option-value">value</code> attribute or a <code title= "attr-option-value">value</code> attribute that is not the empty string <a href="#command1" title="concept-command">defines a command</a> . The <a href="#type16" title="command-facet-Type">Type</a> of the command is "radio" if the <code>option</code> 's nearest ancestor <code>select</code> element has no <code title= "attr-select-multiple">multiple</code> attribute, and "checkbox" if it does. The <a href="#id1" title="command-facet-ID">ID</a> of the command is the value of the <code title="attr-id"><a href= "#id">id</a></code> attribute of the element, if the attribute is present and not empty. Otherwise the command is an <a href= "#anonymous">anonymous command</a> . The <a href="#label2" title="command-facet-Label">Label</a> of the command is the value of the <code>option</code> element's <code title="attr-option-label">label</code> attribute, if there is one, or the value of the <code>option</code> element's <code><a href="#textcontent">textContent</a></code> DOM attribute if it doesn't. The <a href="#hint" title="command-facet-Hint">Hint</a> of the command is the string given by the element's <code title= "attr-title"><a href="#title">title</a></code> attribute, if any, and the empty string if the attribute is absent. There is no <a href="#icon1" title="command-facet-Icon">Icon</a> for the command. The <a href="#hidden1" title="command-facet-HiddenState">Hidden State</a> of the command is always false. (The command is never hidden.) The <a href="#disabled6" title= "command-facet-DisabledState">Disabled State</a> of the command is true (disabled) if the element has a <code title= "attr-option-disabled">disabled</code> attribute, and false otherwise. The <a href="#checked2" title= "command-facet-CheckedState">Checked State</a> of the command is true (checked) if the element's <code title= "dom-option-selected">selected</code> DOM attribute is true, and false otherwise. The <a href="#action" title="command-facet-Action">Action</a> of the command depends on its <a href="#type16" title= "command-facet-Type">Type</a> . If the command is of <a href= "#type16" title="command-facet-Type">Type</a> "radio" then this must set the <code title="dom-option-selected">selected</code> DOM attribute of the <code>option</code> element to true, otherwise it must toggle the state of the <code title= "dom-option-selected">selected</code> DOM attribute (set it to true if it is false and vice versa). Then <a href="#firing0" title= "fire a change event">a <code title="">change</code> event must be fired</a> on the <code>option</code> element's nearest ancestor <code>select</code> element (if there is one), as if the selection had been changed directly. <h5 id="using3"><del class= "diff-old">3.18.5.5.</del> <ins class= "diff-chg">3.16.5.5.</ins> Using the <dfn id="command3" title="command-element"><code>command</code></dfn> element to define a command</h5> A <code><a href="#command0">command</a></code> element <a href= "#command1" title="concept-command">defines a command</a> . The <a href="#type16" title="command-facet-Type">Type</a> of the command is "radio" if the <code><a href= "#command0">command</a></code> 's <code title= "attr-command-type"><a href="#type13">type</a></code> attribute is " <code>radio</code> ", "checkbox" if the attribute's value is " <code>checkbox</code> ", and "command" otherwise. The <a href="#id1" title="command-facet-ID">ID</a> of the command is the value of the <code title="attr-id"><a href= "#id">id</a></code> attribute of the element, if the attribute is present and not empty. Otherwise the command is an <a href= "#anonymous">anonymous command</a> . The <a href="#label2" title="command-facet-Label">Label</a> of the command is the value of the element's <code title= "attr-command-label"><a href="#label">label</a></code> attribute, if there is one, or the empty string if it doesn't. The <a href="#hint" title="command-facet-Hint">Hint</a> of the command is the string given by the element's <code title= "attr-command-title"><a href="#title6">title</a></code> attribute, if any, and the empty string if the attribute is absent. The <a href="#icon1" title="command-facet-Icon">Icon</a> for the command is the absolute URI resulting from resolving the value of the element's <code title="attr-command-icon"><a href= "#icon">icon</a></code> attribute as a URI relative to the <a href= "#elements2">element's base <del class="diff-old">URI.</del> <ins class="diff-chg">URI</ins></a> . If the element has no <code title="attr-command-icon"><a href="#icon">icon</a></code> attribute then the command has no <a href="#icon1" title= "command-facet-Icon">Icon</a> . The <a href="#hidden1" title="command-facet-HiddenState">Hidden State</a> of the command is true (hidden) if the element has a <code title="attr-command-hidden"><a href= "#hidden">hidden</a></code> attribute, and false otherwise. The <a href="#disabled6" title= "command-facet-DisabledState">Disabled State</a> of the command is true (disabled) if the element has either a <code title= "attr-command-disabled"><a href="#disabled4">disabled</a></code> attribute or a <code title="attr-command-hidden"><a href= "#hidden">hidden</a></code> attribute (or both), and false otherwise. The <a href="#checked2" title= "command-facet-CheckedState">Checked State</a> of the command is true (checked) if the element has a <code title= "attr-command-checked"><a href="#checked0">checked</a></code> attribute, and false otherwise. The <a href="#action" title="command-facet-Action">Action</a> of the command is to invoke the <del class="diff-old">behaviour</del> <ins class="diff-chg">behavior</ins> described in the definition of the <code title="dom-command-click"><a href= "#click0">click()</a></code> method of the <code><a href= "#htmlcommandelement">HTMLCommandElement</a></code> interface. <h3 id="datatemplate"><del class= "diff-old">3.19.</del> <ins class="diff-chg">3.17</ins> Data Templates</h3> <h4 id="introduction0"><del class= "diff-old">3.19.1.</del> <ins class="diff-chg">3.17.1</ins> Introduction</h4> <ins class="diff-new">This section is non-normative.</ins> ...examples... <h4 id="the-datatemplate"><del class= "diff-old">3.19.2.</del> <ins class="diff-chg">3.17.2</ins> The <dfn id="datatemplate0"><code>datatemplate</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd><a href="#metadata0">Metadata content</a> .</dd> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Contexts in which this element may be used:</dt> <dd>As the root element of an <a href="#xml-documents" title= "xml documents">XML document</a> .</dd> <dd>Where <a href="#metadata0">metadata content</a> is expected.</dd> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd>Zero or more <code><a href="#rule">rule</a></code> elements.</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#datatemplate0">datatemplate</a></code> element brings together the various rules that form a data template. The element doesn't itself do anything exciting. <h4 id="the-rule"><del class= "diff-old">3.19.3.</del> <ins class="diff-chg">3.17.3</ins> The <dfn id="rule"><code>rule</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As a child of a <code><a href= "#datatemplate0">datatemplate</a></code> element.</dd> <dt>Content model:</dt> <dd>Anything, regardless of the children's required contexts (but see prose).</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-rule-condition"><a href= "#condition">condition</a></code></dd> <dd><code title="attr-rule-mode"><a href= "#mode">mode</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlruleelement">HTMLRuleElement</dfn> : <a href="#htmlelement">HTMLElement</a> { attribute DOMString <a href="#condition0" title= "dom-rule-condition">condition</a>; attribute DOMString <a href="#mode0" title= "dom-rule-mode">mode</a>; readonly attribute DOMTokenString <a href="#modelist" title= "dom-rule-modeList">modeList</a>; }; </pre></dd> </dl> The <code><a href="#rule">rule</a></code> element represents a template of content that is to be used for elements when <a href= "#update" title="datatemplate-regen">updating an element's generated content</a> . The <dfn id="condition" title= "attr-rule-condition"><code>condition</code></dfn> attribute, if specified, must contain a valid selector. It specifies which nodes in the data tree will have the condition's template applied. <a href="#references">[SELECTORS]</a> If the <code title="attr-rule-condition"><a href= "#condition">condition</a></code> attribute is not specified, then the condition applies to all elements, text nodes, CDATA nodes, and processing instructions. The <dfn id="mode" title= "attr-rule-mode"><code>mode</code></dfn> attribute, if specified, must have a value that is an <a href="#unordered">unordered set of unique space-separated tokens</a> representing the various modes for which the rule applies. When, and only when, the <code title= "attr-rule-mode"><a href="#mode">mode</a></code> attribute is omitted, the rule applies if and only if the mode is the empty string. A mode is invoked by the <code><a href= "#nest">nest</a></code> element; for the first node (the root node) of the data tree, the mode is the empty string. The contents of <code><a href="#rule">rule</a></code> elements form a template, and may be anything that, when the parent <code><a href="#datatemplate0">datatemplate</a></code> is applied to some conforming data, results in a conforming DOM tree. The <dfn id="condition0" title= "dom-rule-condition"><code>condition</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the <code title= "attr-rule-condition"><a href="#condition">condition</a></code> content attribute. The <dfn id="mode0" title= "dom-rule-mode"><code>mode</code></dfn> and <dfn id="modelist" title="dom-rule-modeList"><code>modeList</code></dfn> DOM attributes must <a href="#reflect">reflect</a> the <code title= "attr-rule-mode"><a href="#mode">mode</a></code> content attribute. <h4 id="the-nest"><del class= "diff-old">3.19.4.</del> <ins class="diff-chg">3.17.4</ins> The <dfn id="nest"><code>nest</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As a child of a descendant of a <code><a href= "#rule">rule</a></code> element, regardless of the element's content model.</dd> <dt>Content model:</dt> <dd>Empty.</dd> <dt>Element-specific attributes:</dt> <dd><code title="attr-nest-filter"><a href= "#filter">filter</a></code></dd> <dd><code title="attr-nest-mode"><a href= "#mode1">mode</a></code></dd> <dt>DOM interface:</dt> <dd> <pre class="idl"> interface <dfn id= "htmlnestelement">HTMLNestElement</dfn> : <a href="#htmlelement">HTMLElement</a> { attribute DOMString <a href="#filter0" title= "dom-nest-filter">filter</a>; attribute DOMString <a href="#mode2" title= "dom-nest-mode">mode</a>; }; </pre></dd> </dl> The <code><a href="#nest">nest</a></code> element represents a point in a template where the user agent should recurse and start inserting the children of the data node that matches the <code><a href="#rule">rule</a></code> in which the <code><a href= "#nest">nest</a></code> element finds itself. The <dfn id="filter" title= "attr-nest-filter"><code>filter</code></dfn> attribute, if specified, must contain a valid selector. It specifies which of the child nodes in the data tree will be examined for further processing at this point. <a href="#references">[SELECTORS]</a> If the <code title="attr-nest-filter"><a href= "#filter">filter</a></code> attribute is not specified, then all elements, text nodes, CDATA nodes, and processing instructions are processed. The <dfn id="mode1" title= "attr-nest-mode"><code>mode</code></dfn> attribute, if specified, must have a value that is a word token consisting of one or more characters, none of which are <a href="#space" title= "space character">space characters</a> . It gives the mode which will be in effect when looking at the rules in the data template. The <dfn id="filter0" title= "dom-nest-filter"><code>filter</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the <code title= "attr-nest-filter"><a href="#filter">filter</a></code> content attribute. The <dfn id="mode2" title= "dom-nest-mode"><code>mode</code></dfn> DOM attribute must <a href= "#reflect">reflect</a> the <code title="attr-nest-mode"><a href= "#mode1">mode</a></code> content attribute. <h4 id="global0"><del class= "diff-old">3.19.5.</del> <ins class="diff-chg">3.17.5</ins> Global attributes for data templates</h4> The <dfn id="template" title= "attr-template"><code>template</code></dfn> attribute may be added to an element to indicate that the template processing model is to be applied to that element. The <code title="attr-template"><a href= "#template">template</a></code> attribute, when specified, must be a URI to an XML or HTML document, or a fragment identifier pointing at another part of the document. If there is a fragment identifier present, then the element with that ID in the target document must be a <code><a href="#datatemplate0">datatemplate</a></code> element, otherwise, the root element must be a <code><a href= "#datatemplate0">datatemplate</a></code> element. The <dfn id="template0" title= "dom-template"><code>template</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the <code title= "attr-template"><a href="#template">template</a></code> content attribute. The <dfn id="ref" title="attr-ref"><code>ref</code></dfn> attribute may be specified on any element on which the <code title= "attr-template"><a href="#template">template</a></code> attribute is specified. If it is specified, it must be a URI to an XML or HTML document, or a fragment identifier pointing at another part of the document. When an element has a <code title="attr-template"><a href= "#template">template</a></code> attribute but no <code title= "attr-ref"><a href="#ref">ref</a></code> attribute, the element may, instead of its usual content model, have a single element of any kind. That element is then used as the root node of the data for the template. The <dfn id="ref0" title="dom-ref"><code>ref</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the <code title= "attr-ref"><a href="#ref">ref</a></code> content attribute. The <dfn id="registrationmark" title= "attr-registrationmark"><code>registrationmark</code></dfn> attribute may be specified on any element that is a descendant of a <code><a href="#rule">rule</a></code> element, except <code><a href="#nest">nest</a></code> elements. Its value may be any string, including the empty string (which is the value that is assumed if the attribute is omitted). This attribute performs a role similar to registration marks in printing presses: when the generated content is regenerated, elements with the same <code title="attr-registrationmark"><a href= "#registrationmark">registrationmark</a></code> are lined up. This allows the author to disambiguate how elements should be moved around when generated content is regenerated in the face of changes to the data tree. The <dfn id="registrationmark0" title= "dom-registrationMark"><code>registrationMark</code></dfn> DOM attribute must <a href="#reflect">reflect</a> the <code title= "attr-registrationmark"><a href= "#registrationmark">registrationmark</a></code> content attribute. <h4 id="processing1"><del class= "diff-old">3.19.6.</del> <ins class="diff-chg">3.17.6</ins> Processing model</h4> <h5 id="the-originalcontent"><del class= "diff-old">3.19.6.1.</del> <ins class= "diff-chg">3.17.6.1.</ins> The <code title= "dom-originalContent"><a href= "#originalcontent">originalContent</a></code> DOM attribute</h5> The <dfn id="originalcontent" title= "dom-originalContent"><code>originalContent</code></dfn> is set to a <code>DocumentFragment</code> to hold the original children of an element that has been replaced by content generated for a data template. Initially, it must be null. Its value is set when the <code title="attr-template"><a href="#template">template</a></code> attribute is set to a usable value, and is unset when the attribute is removed. The <code title="dom-originalContent"><a href= "#originalcontent">originalContent</a></code> DOM attribute can thus be used as an indicator of whether a template is currently being applied, just as the <code title= "dom-templateElement"><a href= "#templateelement">templateElement</a></code> DOM attribute can. <h5 id="the-template"><del class= "diff-old">3.19.6.2.</del> <ins class= "diff-chg">3.17.6.2.</ins> The <code title= "attr-template"><a href="#template">template</a></code> attribute</h5> <dfn id="setting" title= "datatemplate-template-set">Setting</dfn> : When an <a href= "#html-elements" title="HTML elements">HTML element</a> without a <code title="attr-template"><a href="#template">template</a></code> attribute has its <code title="attr-template"><a href= "#template">template</a></code> attribute set, the user agent must fetch the specified file and parse it (without a <a href= "#browsing1">browsing context <del class="diff-old">, and with scripting disabled</del></a> ) to obtain a DOM. If the URI is the same as the URI of the current document, then the current document's DOM must be assumed to be that parsed DOM. While this loading and parsing is in progress, the element is said to be busy loading the template rules or data . If the resource specified by the <code title= "attr-template"><a href="#template">template</a></code> attribute is not the current document and does not have an XML MIME type, or if an XML parse error is found while parsing the resource, then the resource cannot be successfully parsed, and the user agent must jump to the <a href="#failed" title= "datatemplate-template-failed">failed to parse</a> steps below. Once the DOM in question has been parsed, assuming that it indeed can be parsed and does so successfully, the user agent must wait for no scripts to be executing, and as soon as that opportunity arises, run the following algorithm: <ol> <li> If the <code title="attr-template"><a href= "#template">template</a></code> attribute's value has a fragment identifier, and, in the DOM in question, it identifies a <code><a href="#datatemplate0">datatemplate</a></code> element, then set the <code title="dom-templateElement"><a href= "#templateelement">templateElement</a></code> DOM attribute to that element. Otherwise, if the <code title="attr-template"><a href= "#template">template</a></code> attribute value does not have a fragment identifier, and the root element of the DOM in question is a <code><a href="#datatemplate0">datatemplate</a></code> element, then set the <code title="dom-templateElement"><a href= "#templateelement">templateElement</a></code> DOM attribute to that element. Otherwise, jump to the <a href="#failed" title= "datatemplate-template-failed">failed to parse</a> steps below. </li> <li> Create a new <code>DocumentFragment</code> and move all the nodes that are children of the element to that <code>DocumentFragment</code> object. Set the <code title= "dom-originalContent"><a href= "#originalcontent">originalContent</a></code> DOM attribute on the element to this new <code>DocumentFragment</code> object. </li> <li> Jump to the steps below for <a href="#update" title= "datatemplate-regen">updating the generated content</a> . </li> </ol> If the resource has <dfn id="failed" title= "datatemplate-template-failed">failed to parse</dfn> , the user agent must <a href="#firing2">fire a simple event</a> with the name <code title="event-error"><a href="#error1">error</a></code> at the element on which the <code title="attr-template"><a href= "#template">template</a></code> attribute was found. <dfn id="unsetting" title= "datatemplate-template-unset">Unsetting</dfn> : When an <a href= "#html-elements" title="HTML elements">HTML element</a> with a <code title="attr-template"><a href="#template">template</a></code> attribute has its <code title="attr-template"><a href= "#template">template</a></code> attribute removed or dynamically changed from one value to another, the user agent must run the following algorithm: <ol> <li> Set the <code title="dom-templateElement"><a href= "#templateelement">templateElement</a></code> DOM attribute to null. </li> <li> If the <code title="dom-originalContent"><a href= "#originalcontent">originalContent</a></code> DOM attribute of the element is not null, run these substeps: <ol> <li> Remove all the nodes that are children of the element. </li> <li> Append the nodes in the <code title= "dom-originalContent"><a href= "#originalcontent">originalContent</a></code> <code>DocumentFragment</code> to the element. </li> <li> Set <code title="dom-originalContent"><a href= "#originalcontent">originalContent</a></code> to null. </li> </ol> (If the <code title="dom-originalContent"><a href= "#originalcontent">originalContent</a></code> DOM attribute of the element is null, then either there was an error loading or parsing the previous template, or the previous template never finished loading; in either case, there is nothing to undo.) </li> <li> If the <code title="attr-template"><a href= "#template">template</a></code> attribute was changed (as opposed to simply removed), then <a href="#setting" title= "datatemplate-template-set">act as if it was now set to its new value</a> (fetching the specified page, etc, as described above). </li> </ol> The <dfn id="templateelement" title= "dom-templateElement"><code>templateElement</code></dfn> DOM attribute is updated by the above algorithm to point to the currently active <code><a href= "#datatemplate0">datatemplate</a></code> element. Initially, the attribute must have the value null. <h5 id="the-ref"><del class= "diff-old">3.19.6.3.</del> <ins class= "diff-chg">3.17.6.3.</ins> The <code title= "attr-ref"><a href="#ref">ref</a></code> attribute</h5> <dfn id="setting0" title="datatemplate-ref-set">Setting</dfn> : When an <a href="#html-elements" title="HTML elements">HTML element</a> without a <code title="attr-ref"><a href= "#ref">ref</a></code> attribute has its <code title= "attr-ref"><a href="#ref">ref</a></code> attribute set, the user agent must fetch the specified file and parse it (without a <a href="#browsing1">browsing context <del class="diff-old">, and with scripting disabled</del></a> ) to obtain a DOM. If the URI is the same as the URI of the current <del class="diff-old">document ,</del> <ins class="diff-chg">document,</ins> then the current document's DOM is assumed to be that parsed DOM. While this loading and parsing is in progress, the element is said to be busy loading the template rules or data . If the resource specified by the <code title="attr-ref"><a href= "#ref">ref</a></code> attribute is not the current document and does not have an XML MIME type, or if an XML parse error is found while parsing the resource, then the resource cannot be successfully parsed, and the user agent must jump to the <a href= "#failed0" title="datatemplate-ref-failed">failed to parse</a> steps below. Once the DOM in question has been parsed, assuming that it indeed can be parsed and does so successfully, the user agent must wait for no scripts to be executing, and as soon as that opportunity arises, run the following algorithm: <ol> <li> If the <code title="attr-ref"><a href="#ref">ref</a></code> attribute value does not have a fragment identifier, then set the <code title="dom-refNode"><a href="#refnode">refNode</a></code> DOM attribute to the <code>Document</code> node of that DOM. Otherwise, if the <code title="attr-ref"><a href= "#ref">ref</a></code> attribute's value has a fragment identifier, and, in the DOM in question, that fragment identifier identifies an element, then set the <code title="dom-refNode"><a href= "#refnode">refNode</a></code> DOM attribute to that element. Otherwise, jump to the <a href="#failed0" title= "datatemplate-ref-failed">failed to parse</a> steps below. </li> <li> Jump to the steps below for <a href="#update" title= "datatemplate-regen">updating the generated content</a> . </li> </ol> If the resource has <dfn id="failed0" title= "datatemplate-ref-failed">failed to parse</dfn> , the user agent must <a href="#firing2">fire a simple event</a> with the name <code title="event-error"><a href="#error1">error</a></code> at the element on which the <code title="attr-ref"><a href= "#ref">ref</a></code> attribute was found, and must then jump to the steps below for <a href="#update" title= "datatemplate-regen">updating the generated content</a> (the contents of the element will be used instead of the specified resource). <dfn id="unsetting0" title= "datatemplate-ref-unset">Unsetting</dfn> : When an <a href= "#html-elements" title="HTML elements">HTML element</a> with a <code title="attr-ref"><a href="#ref">ref</a></code> attribute has its <code title="attr-ref"><a href="#ref">ref</a></code> attribute removed or dynamically changed from one value to another, the user agent must run the following algorithm: <ol> <li> Set the <code title="dom-refNode"><a href= "#refnode">refNode</a></code> DOM attribute to null. </li> <li> If the <code title="attr-ref"><a href="#ref">ref</a></code> attribute was changed (as opposed to simply removed), then <a href= "#setting0" title="datatemplate-ref-set">act as if it was now set to its new value</a> (fetching the specified page, etc, as described above). Otherwise, jump to the steps below for <a href= "#update" title="datatemplate-regen">updating the generated content</a> . </li> </ol> The <dfn id="refnode" title= "dom-refNode"><code>refNode</code></dfn> DOM attribute is updated by the above algorithm to point to the current data tree, if one is specified explicitly. If it is null, then the data tree is given by the <code title="dom-originalContent"><a href= "#originalcontent">originalContent</a></code> DOM attribute, unless that is also null, in which case no template is currently being applied. Initially, the attribute must have the value null. <h5 id="the-nodedatatemplate"><del class= "diff-old">3.19.6.4.</del> <ins class= "diff-chg">3.17.6.4.</ins> The <code><a href= "#nodedatatemplate">NodeDataTemplate</a></code> interface</h5> All objects that implement the <code>Node</code> interface must also implement the <code><a href= "#nodedatatemplate">NodeDataTemplate</a></code> interface, whose members must be accessible using binding-specific casting mechanisms. <pre class="idl"> interface <dfn id="nodedatatemplate">NodeDataTemplate</dfn> { readonly attribute Node <a href="#datanode" title= "dom-dataNode">dataNode</a>; }; </pre> The <dfn id="datanode" title= "dom-dataNode"><code>dataNode</code></dfn> DOM attribute returns the node for which this node was generated. It must initially be null. It is set on the nodes that form the content generated during the <a href="#update" title= "datatemplate-regen">algorithm for updating the generated content</a> of elements that are using the data template feature. <h5 id="mutations"><del class= "diff-old">3.19.6.5.</del> <ins class= "diff-chg">3.17.6.5.</ins> Mutations</h5> An element with a non-null <code title= "dom-templateElement"><a href= "#templateelement">templateElement</a></code> is said to be a <dfn id="data-tree">data tree user</dfn> of the node identified by the element's <code title="dom-refNode"><a href= "#refnode">refNode</a></code> attribute, as well as all of that node's children, or, if that attribute is null, of the node identified by the element's <code title= "dom-originalContent"><a href= "#originalcontent">originalContent</a></code> , as well as all that node's children. Nodes that have one or more <a href="#data-tree" title= "data tree user">data tree users</a> associated with them (as per the previous paragraph) are themselves termed <dfn id="data-tree0" title="data tree component node">data tree component nodes</dfn> . Whenever a <a href="#data-tree0">data tree component node</a> changes its name or value, or has one of its attributes change name or value, or has an attribute added or removed, or has a child added or removed, the user agent must update the generated content of all of that node's <a href="#data-tree" title= "data tree user">data tree users</a> . An element with a non-null <code title= "dom-templateElement"><a href= "#templateelement">templateElement</a></code> is also said to be a <dfn id="template1">template tree user</dfn> of the node identified by the element's <code title="dom-templateElement"><a href= "#templateelement">templateElement</a></code> attribute, as well as all of that node's children. Nodes that have one or more <a href="#template1" title= "template tree user">template tree users</a> associated with them (as per the previous paragraph) are themselves termed <dfn id= "template2" title="template tree component node">template tree component nodes</dfn> . Whenever a <a href="#template2">template tree component node</a> changes its name or value, or has one of its attributes change name or value, or has an attribute added or removed, or has a child added or removed, the user agent must update the generated content of all of that node's <a href="#template1" title= "template tree user">template tree users</a> . In other words, user agents update the content generated from a template whenever either the backing data changes or the template itself changes. <h5 id="updating0"><del class= "diff-old">3.19.6.6.</del> <ins class= "diff-chg">3.17.6.6.</ins> Updating the generated content</h5> When the user agent is to <dfn id="update" title= "datatemplate-regen">update the generated content</dfn> of an element that uses a template, the user agent must run the following steps: <ol> <li> Let <var title="">destination</var> be the element whose generated content is being updated. </li> <li> If the <var title="">destination</var> element is busy loading the template rules or data , then abort these steps. Either the steps will be invoked again once the loading has completed, or the loading will fail and the generated content will be removed at that point. </li> <li> Let <var title="">template tree</var> be the element given by <var title="">destination</var> 's <code title= "dom-templateElement"><a href= "#templateelement">templateElement</a></code> DOM attribute. If it is null, then abort these steps. There are no rules to apply. </li> <li> Let <var title="">data tree</var> be the node given by <var title="">destination</var> 's <code title= "dom-refNode"><a href="#refnode">refNode</a></code> DOM attribute. If it is null, then let <var title="">data tree</var> be the node given by the <code title="dom-originalContent"><a href= "#originalcontent">originalContent</a></code> DOM node. </li> <li> Let <var title="">existing nodes</var> be a set of ordered lists of nodes, each list being identified by a tuple consisting of a node, a node type and name, and a <a href="#registrationmark" title="attr-registrationmark">registration mark</a> (a string). </li> <li> For each node <var title="">node</var> that is a descendant of <var title="">destination</var> , if any, add <var title= "">node</var> to the list identified by the tuple given by: <var title="">node</var> 's <code title="dom-dataNode"><a href= "#datanode">dataNode</a></code> DOM attribute; the <var title= "">node</var> 's node type and, if it's an element, its qualified name (that is, its namespace and local name), or, if it's a processing instruction, its target name , and the value of the <var title="">node</var> 's <code title= "attr-registrationmark"><a href= "#registrationmark">registrationmark</a></code> attribute, if it has one, or the empty string otherwise. </li> <li> Remove all the child nodes of <var title="">destination</var> , so that its child node list is empty. </li> <li> Run the <a href="#levenberg">Levenberg data node algorithm</a> (described below) using <var title="">destination</var> as the destination node, <var title="">data tree</var> as the source node, <var title="">template tree</var> as the rule container, the empty string as the mode, and the <var title="">existing nodes</var> lists as the lists of existing nodes. </li> </ol> The Levenberg algorithm consists of two algorithms that invoke each other recursively, the <a href="#levenberg">Levenberg data node algorithm</a> and the <a href="#levenberg0">Levenberg template node algorithm</a> . These algorithms use the data structures <del class="diff-old">initialised</del> <ins class= "diff-chg">initialized</ins> by the set of steps described above. The <dfn id="levenberg">Levenberg data node algorithm</dfn> is as follows. It is always invoked with three DOM nodes, one string, and a set of lists as arguments: the <var title="">destination node</var> , the <var title="">source node</var> , the <var title= "">rule container</var> , the <var title="">mode string</var> , and the <var title="">existing nodes lists</var> respectively. <ol> <li> Let <var title="">condition</var> be the first <code><a href= "#rule">rule</a></code> element child of the <var title="">rule container</var> element, or null if there aren't any. </li> <li> If <var title="">condition</var> is null, follow these substeps: <ol> <li> If the <var title="">source node</var> is an element, then, for each child <var title="">child node</var> of the <var title= "">source node</var> element, in tree order, invoke the <a href= "#levenberg">Levenberg data node algorithm</a> recursively, with <var title="">destination node</var> , <var title="">child node</var> , <var title="">rule container</var> , the empty string, and <var title="">existing nodes lists</var> as the five arguments respectively. </li> <li> Abort the current instance of the <a href="#levenberg">Levenberg data node algorithm</a> , returning to whatever algorithm invoked it. </li> </ol> </li> <li> Let <var title="">matches</var> be a boolean with the value true. </li> <li> If the <var title="">condition</var> element has a <code title= "attr-rule-mode"><a href="#mode">mode</a></code> attribute, but the value of that attribute is not a mode match for the current mode string , then let <var title= "">matches</var> be false. </li> <li> If the <var title="">condition</var> element has a <code title= "attr-rule-condition"><a href="#condition">condition</a></code> attribute, and the attribute's value, when <a href= "#evaluated">evaluated as a selector</a> , does not match the current <var title="">source node</var> , then let <var title= "">matches</var> be false. </li> <li> If <var title="">matches</var> is true, then follow these substeps: <ol> <li> For each child <var title="">child node</var> of the <var title= "">condition</var> element, in tree order, invoke the <a href= "#levenberg0">Levenberg template node algorithm</a> recursively, with the five arguments being <var title="">destination node</var> , <var title="">source node</var> , <var title="">rule container</var> , <var title="">child node</var> , and <var title= "">existing nodes lists</var> respectively. </li> <li> Abort the current instance of the <a href="#levenberg">Levenberg data node algorithm</a> , returning to whatever algorithm invoked it. </li> </ol> </li> <li> Let <var title="">condition</var> be the next <code><a href= "#rule">rule</a></code> element that is a child of the <var title= "">rule container</var> element, after the <var title= "">condition</var> element itself, or null if there are no more <code><a href="#rule">rule</a></code> elements. </li> <li> Jump to step 2 in this set of steps. </li> </ol> The <dfn id="levenberg0">Levenberg template node algorithm</dfn> is as follows. It is always invoked with four DOM nodes and a set of lists as arguments: the <var title="">destination node</var> , the <var title="">source node</var> , the <var title="">rule container</var> , the <var title="">template node</var> , and the <var title="">existing nodes lists</var> respectively. <ol> <li> If <var title="">template node</var> is a comment node, abort the current instance of the <a href="#levenberg0">Levenberg template node algorithm</a> , returning to whatever algorithm invoked it. </li> <li> If <var title="">template node</var> is a <code><a href= "#nest">nest</a></code> element, then run these substeps: <ol> <li> If <var title="">source node</var> is not an element, then abort the current instance of the <a href="#levenberg0">Levenberg template node algorithm</a> , returning to whatever algorithm invoked it. </li> <li> If the <var title="">template node</var> has a <code title= "attr-nest-mode"><a href="#mode1">mode</a></code> attribute, then let <var title="">mode</var> be the value of that attribute; otherwise, let <var title="">mode</var> be the empty string. </li> <li> Let <var title="">child node</var> be the first child of the <var title="">source node</var> element, or null if <var title= "">source node</var> has no children. </li> <li> If <var title="">child node</var> is null, abort the current instance of the <a href="#levenberg0">Levenberg template node algorithm</a> , returning to whatever algorithm invoked it. </li> <li> If the <var title="">template node</var> element has a <code title="attr-nest-filter"><a href="#filter">filter</a></code> attribute, and the attribute's value, when <a href= "#evaluated">evaluated as a selector</a> , matches <var title= "">child node</var> , then invoke the <a href= "#levenberg">Levenberg data node algorithm</a> recursively, with <var title="">destination node</var> , <var title="">child node</var> , <var title="">rule container</var> , <var title= "">mode</var> , and <var title="">existing nodes lists</var> as the five arguments respectively. </li> <li> Let <var title="">child node</var> be <var title="">child node</var> 's next sibling, or null if <var title="">child node</var> was the last node of <var title="">source node</var> . </li> <li> Return to step 4 in this set of substeps. </li> </ol> </li> <li> If <var title="">template node</var> is an element, and that element has a <code title="attr-registrationmark"><a href= "#registrationmark">registrationmark</a></code> attribute, then let <var title="">registration mark</var> have the value of that attribute. Otherwise, let <var title="">registration mark</var> be the empty string. </li> <li> If there is a list in the <var title="">existing nodes lists</var> corresponding to the tuple ( <var title="">source node</var> , the node type and name of <var title="">template node</var> , <var title="">registration mark</var> ), and that list is not empty, then run the following substeps. (For an element node, the name of the node is its qualified tag name, i.e. its namespace and local name. For a processing instruction, its name is the target. For other types of nodes, there is no name.) <ol> <li> Let <var title="">new node</var> be the first node in that list. </li> <li> Remove <var title="">new node</var> from that list. </li> <li> If <var title="">new node</var> is an element, remove all the child nodes of <var title="">new node</var> , so that its child node list is empty. </li> </ol> Otherwise, if there is no matching list, or there was, but it is now empty, then run these steps instead: <ol> <li> Let <var title="">new node</var> be a shallow clone of <var title="">template node</var> . </li> <li> Let <var title="">new node</var> 's <code title= "dom-dataNode"><a href="#datanode">dataNode</a></code> DOM attribute be <var title="">source node</var> . </li> </ol> </li> <li> If <var title="">new node</var> is an element, run these substeps: <ol> <li> For each attribute on <var title="">new node</var> , if an attribute with the same qualified name is not present on <var title="">template node</var> , remove that attribute. </li> <li> For each attribute <var title="">attribute</var> on <var title= "">template node</var> , run these substeps: <ol> <li> Let <var title="">expanded</var> be the result of passing the value of <var title="">attribute</var> to the <a href= "#text-expansion">text expansion algorithm for templates</a> along with <var title="">source node</var> . </li> <li> If an attribute with the same qualified name as <var title= "">attribute</var> is already present on <var title="">new node</var> , then: if its value is different from <var title= "">expanded</var> , replace its value with <var title= "">expanded</var> . </li> <li> Otherwise, if there is no attribute with the same qualified name as <var title="">attribute</var> on <var title="">new node</var> , then add an attribute with the same namespace, prefix, and local name as <var title="">attribute</var> , with its value set to <var title="">expanded</var> 's. </li> </ol> </li> </ol> Otherwise, the <var title="">new node</var> is a text node, CDATA block, or PI. Run these substeps instead: <ol> <li> Let <var title="">expanded</var> be the result of passing the node value of <var title="">template node</var> (the content of the text node, CDATA block, or PI) to the <a href= "#text-expansion">text expansion algorithm for templates</a> along with <var title="">source node</var> . </li> <li> If the value of the <var title="">new node</var> is different from <var title="">expanded</var> , then set the value of <var title="">new node</var> to <var title="">expanded</var> . </li> </ol> </li> <li> Append <var title="">new node</var> to <var title= "">destination</var> . </li> <li> If <var title="">template node</var> is an element, then, for each child <var title="">child node</var> of the <var title= "">template node</var> element, in tree order, invoke the <a href= "#levenberg0">Levenberg template node algorithm</a> recursively, with the five arguments being <var title="">new child</var> , <var title="">source node</var> , <var title="">rule container</var> , <var title="">child node</var> , and <var title= "">existing nodes lists</var> respectively. </li> </ol> Define: <dfn id="evaluated">evaluated as a selector</dfn> Define: <dfn id="text-expansion">text expansion algorithm for templates</dfn> <h3 id="miscellaneous"><del class= "diff-old">3.20.</del> <ins class="diff-chg">3.18</ins> Miscellaneous elements</h3> <h4 id="the-legend"><del class= "diff-old">3.20.1.</del> <ins class="diff-chg">3.18.1</ins> The <dfn id="legend"><code>legend</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>As the first child of a <code>fieldset</code> element.</dd> <dd>As the first child of a <code><a href= "#details">details</a></code> element.</dd> <dd>As a child of a <code><a href="#figure">figure</a></code> element, if there are no other <code><a href= "#legend">legend</a></code> element children of that element.</dd> <dt>Content model:</dt> <dd><a href="#phrasing0">Phrasing content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#legend">legend</a></code> element represents a title or explanatory caption for the rest of the contents of the <code><a href="#legend">legend</a></code> element's parent element. <h4 id="the-div"><del class= "diff-old">3.20.2.</del> <ins class="diff-chg">3.18.2</ins> The <dfn id="div"><code>div</code></dfn> element</h4> <dl class="element"> <dt>Categories</dt> <dd>None.</dd> <dt>Contexts in which this element may be used:</dt> <dd>Where <del class="diff-old">prose</del> <a href= "#flow-content0"><ins class="diff-chg">flow</ins> content</a> is expected.</dd> <dt>Content model:</dt> <dd><del class="diff-old">Prose</del> <a href= "#flow-content0"><ins class="diff-chg">Flow</ins> content</a> .</dd> <dt>Element-specific attributes:</dt> <dd>None.</dd> <dt>DOM interface:</dt> <dd><del class="diff-old">No difference from</del> <ins class= "diff-chg">Uses</ins> <code><a href= "#htmlelement">HTMLElement</a></code> .</dd> </dl> The <code><a href="#div">div</a></code> element represents nothing at all. It can be used with the <code title= "attr-class"><a href="#class">class</a></code> , <code title= "attr-lang"><a href="#lang">lang</a></code> / <code title= "attr-xml-lang"><a href="#xmllang">xml:lang</a></code> , and <code title="attr-title"><a href="#title">title</a></code> attributes to mark up semantics common to a group of consecutive elements. Allowing <code><a href="#div">div</a></code> elements to contain phrasing content makes it easy for authors to abuse <code><a href="#div">div</a></code> , using it with the <code>class=""</code> attribute to the point of not having any other elements in the markup. This is a disaster from an accessibility point of view, and it would be nice if we could somehow make such pages non-compliant without preventing people from using <code><a href="#div">div</a></code> s as the extension mechanism that they are, to handle things the spec can't otherwise do (like making new widgets). <h2 id="web-browsers">4. Web browsers</h2> This section describes features that apply most directly to Web browsers. Having said that, unless specified elsewhere, the requirements defined in this section do apply to all user agents, whether they are Web browsers or not. <h3 id="windows"><del class= "diff-old">4.1.</del> <ins class="diff-chg">4.1</ins> Browsing contexts</h3> A <dfn id="browsing1">browsing context</dfn> is a collection of one or more <code>Document</code> objects, and one or more <a href= "#view" title="view">views</a> . At any one time, one of the <code>Document</code> s in a <a href="#browsing1">browsing context</a> is the <dfn id= "active">active document</dfn> . The collection of <code>Document</code> s is the <a href="#browsing1">browsing context</a> 's <a href="#session">session history</a> . A <dfn id="view">view</dfn> is a user agent interface tied to a particular media used for the presentation of <code>Document</code> objects in some media. A view may be interactive. Each view is represented by an <code>AbstractView</code> object. Each view belongs to a <a href="#browsing1">browsing context</a> . <a href= "#references">[DOM2VIEWS]</a> The <code title="">document</code> attribute of an <code>AbstractView</code> object representing a <a href= "#view">view</a> gives the <code>Document</code> object of the view's <a href="#browsing1">browsing context</a> 's <a href= "#active">active document</a> . <a href= "#references">[DOM2VIEWS]</a> Events that use the <code>UIEvent</code> interface are related to a specific <a href="#view">view</a> (the view in which the event happened); the <code>AbstractView</code> of that view is given in the event object's <code title="">view</code> attribute. <a href="#references">[DOM3EVENTS]</a> A typical Web browser has one obvious <a href= "#view">view</a> per <a href="#browsing1">browsing context</a> : the browser's window (screen media). If a page is printed, however, a second view becomes evident, that of the print media. The two views always share the same underlying <code>Document</code> , but they have a different presentation of that document. A speech browser also establishes a browsing context, one with a view in the speech media. A <code>Document</code> does not necessarily have a <a href="#browsing1">browsing context</a> associated with it. In particular, data mining tools are likely to never instantiate browsing contexts. The main <a href="#view">view</a> through which a user primarily interacts with a user agent is the <dfn id="default3">default view</dfn> . The <a href="#default3">default view</a> of a <code>Document</code> is given by the <code title= "">defaultView</code> attribute on the <code>Document</code> object's <code>DocumentView</code> interface. <a href= "#references">[DOM3VIEWS]</a> When a <a href="#browsing1">browsing context</a> is first created, it must be created with a single <code>Document</code> in its session history, whose address is <code>about:blank</code> , which is marked as being an <a href="#html-" title= "HTML documents">HTML <del class="diff-old">documents .</del> <ins class="diff-chg">document</ins></a> ,<ins class="diff-chg">and whose</ins> <a href="#character1" title= "document's character encoding"><ins class="diff-chg">character encoding</ins></a> <ins class="diff-chg">is UTF-8.</ins> The <code>Document</code> must have a single child <code><a href= "#html">html</a></code> node, which itself has a single child <code><a href="#body0">body</a></code> node. If the <a href= "#browsing1">browsing context</a> is created specifically to be immediately navigated, then that initial navigation will have <a href="#replacement">replacement enabled</a> . <ins class="diff-new">The</ins> <a href= "#origin0"><ins class="diff-new">origin</ins></a> <ins class= "diff-new">of the</ins> <code><ins class= "diff-new">about:blank</ins></code> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">is set when the</ins> <code><ins class="diff-new">Document</ins></code> <ins class="diff-new">is created, in a manner dependent on whether the</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">created is a</ins> <a href= "#nested0"><ins class="diff-new">nested browsing context</ins></a> ,<ins class="diff-new">as follows:</ins> <dl class="switch"> <dt><ins class="diff-new">If the new</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">is a</ins> <a href="#nested0"><ins class= "diff-new">nested browsing context</ins></a></dt> <dd><ins class="diff-new">The</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">of the</ins> <code><ins class="diff-new">about:blank</ins></code> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">is the</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">of the</ins> <a href="#active"><ins class="diff-new">active document</ins></a> <ins class="diff-new">of the new</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">'s</ins> <a href="#parent"><ins class= "diff-new">parent browsing context</ins></a> <ins class= "diff-new">at the time of its creation.</ins></dd> <dt><ins class="diff-new">If the new</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">is an</ins> <a href="#auxiliary0"><ins class= "diff-new">auxiliary browsing context</ins></a></dt> <dd><ins class="diff-new">The</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">of the</ins> <code><ins class="diff-new">about:blank</ins></code> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">is the</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">of the</ins> <a href="#active"><ins class="diff-new">active document</ins></a> <ins class="diff-new">of the new</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">'s</ins> <a href="#opener"><ins class= "diff-new">opener browsing context</ins></a> <ins class= "diff-new">at the time of the new browsing context's creation.</ins></dd> <dt><ins class="diff-new">Otherwise</ins></dt> <dd><ins class="diff-new">The</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">of the</ins> <code><ins class="diff-new">about:blank</ins></code> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">is a globally unique identifier assigned when the new</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">is created.</ins></dd> </dl> <h4 id="nested"><del class= "diff-old">4.1.1.</del> <ins class="diff-chg">4.1.1</ins> Nested browsing contexts</h4> Certain elements (for example, <code><a href= "#iframe">iframe</a></code> elements) can instantiate further <a href="#browsing1" title="browsing context">browsing contexts</a> . These are called <dfn id="nested0" title= "nested browsing context">nested browsing contexts</dfn> . If a browsing context <var title="">P</var> has an element in one of its <code>Document</code> s <var title="">D</var> that nests another browsing context <var title="">C</var> inside it, then <var title= "">P</var> is said to be the <dfn id="parent">parent browsing context</dfn> of <var title="">C</var> , <var title="">C</var> is said to be a <dfn id="child">child browsing context</dfn> of <var title="">P</var> , and <var title="">C</var> is said to be <dfn id="nested1" title="browsing context nested through">nested through</dfn> <var title="">D</var> . <ins class="diff-new">A browsing context</ins> <var title= ""><ins class="diff-new">A</ins></var> <ins class="diff-new">is said to be an ancestor of a browsing context</ins> <var title= ""><ins class="diff-new">B</ins></var> <ins class="diff-new">if there exists a browsing context</ins> <var title=""><ins class= "diff-new">A'</ins></var> <ins class="diff-new">that is a</ins> <a href="#child"><ins class="diff-new">child browsing context</ins></a> <ins class="diff-new">of</ins> <var title= ""><ins class="diff-new">A</ins></var> <ins class="diff-new">and that is itself an ancestor of</ins> <var title=""><ins class= "diff-new">B</ins></var> ,<ins class="diff-new">or if there is a browsing context</ins> <var title=""><ins class= "diff-new">P</ins></var> <ins class="diff-new">that is a</ins> <a href="#child"><ins class="diff-new">child browsing context</ins></a> <ins class="diff-new">of</ins> <var title= ""><ins class="diff-new">A</ins></var> <ins class="diff-new">and that is the</ins> <a href="#parent"><ins class="diff-new">parent browsing context</ins></a> <ins class="diff-new">of</ins> <var title=""><ins class="diff-new">B</ins></var> . The browsing context with no <a href="#parent">parent browsing context</a> is the <dfn id="top-level">top-level browsing context</dfn> of all the browsing contexts <a href="#nested0" title="nested browsing context">nested</a> within it (either directly or indirectly through other nested browsing contexts). <ins class="diff-new">The transitive closure of</ins> <a href= "#parent" title="parent browsing context"><ins class= "diff-new">parent browsing contexts</ins></a> <ins class= "diff-new">for a</ins> <a href="#nested0"><ins class= "diff-new">nested browsing context</ins></a> <ins class= "diff-new">gives the list of</ins> <dfn id="ancestor" title= "ancestor browsing context"><ins class="diff-new">ancestor browsing contexts</ins></dfn> . A <code>Document</code> is said to be <dfn id="fully">fully active</dfn> when it is the <a href="#active">active document</a> of its <a href="#browsing1">browsing context</a> , and either its browsing context is a <a href="#top-level">top-level browsing context</a> , or the <code>Document</code> <a href="#nested1" title="browsing context nested through">through which</a> that browsing context is <a href="#nested0" title= "nested browsing context">nested</a> is itself <a href= "#fully">fully active</a> . Because they are nested through an element, <a href="#child" title="child browsing context">child browsing contexts</a> are always tied to a specific <code>Document</code> in their <a href= "#parent">parent browsing context</a> . User agents must not allow the user to interact with <a href="#child" title= "child browsing context">child browsing contexts</a> of elements that are in <code>Document</code> s that are not themselves <a href="#fully">fully active</a> . <ins class="diff-new">A</ins> <a href="#nested0"><ins class= "diff-new">nested browsing context</ins></a> <ins class= "diff-new">can have a</ins> <a href="#seamless0"><ins class= "diff-new">seamless browsing context flag</ins></a> <ins class= "diff-new">set, if it is embedded through an</ins> <code><a href= "#iframe"><ins class="diff-new">iframe</ins></a></code> <ins class= "diff-new">element with a</ins> <code title= "attr-iframe-seamless"><a href="#seamless"><ins class= "diff-new">seamless</ins></a></code> <ins class= "diff-new">attribute.</ins> <h4 id="auxiliary"><del class= "diff-old">4.1.2.</del> <ins class="diff-chg">4.1.2</ins> Auxiliary browsing contexts</h4> It is possible to create new browsing contexts that are related to a top level browsing context without being nested through an element. Such browsing contexts are called <dfn id= "auxiliary0" title="auxiliary browsing context">auxiliary browsing contexts</dfn> . Auxiliary browsing contexts are always <a href= "#top-level" title="top-level browsing context">top-level browsing contexts</a> . An <a href="#auxiliary0">auxiliary browsing context</a> has an <dfn id="opener">opener browsing context</dfn> , which is the <a href="#browsing1">browsing context</a> from which the <a href= "#auxiliary0">auxiliary browsing context</a> was created, and it has a <dfn id="furthest">furthest ancestor browsing context</dfn> , which is the <a href="#top-level">top-level browsing context</a> of the <a href="#opener">opener browsing context</a> when the <a href= "#auxiliary0">auxiliary browsing context</a> was created. The <dfn id="opener0" title= "dom-opener"><code>opener</code></dfn> DOM attribute on the <code><a href="#window">Window</a></code> object must return the <code><a href="#window">Window</a></code> object of the <a href= "#browsing1">browsing context</a> from which the current browsing context was created (its <a href="#opener">opener browsing context</a> ), if there is one and it is still available. <h4 id="secondary"><del class= "diff-old">4.1.3.</del> <ins class="diff-chg">4.1.3</ins> Secondary browsing contexts</h4> User agents may support <dfn id="secondary0" title= "secondary browsing context">secondary browsing contexts</dfn> , which are <a href="#browsing1" title="browsing context">browsing contexts</a> that form part of the user agent's interface, apart from the main content area. <h4 id="security2"><ins class= "diff-new">4.1.4</ins> <ins class= "diff-new">Security</ins></h4> <ins class="diff-new">A</ins> <a href="#browsing1"><ins class= "diff-new">browsing context</ins></a> <var title=""><ins class= "diff-new">A</ins></var> <ins class="diff-new">is</ins> <dfn id= "allowed"><ins class="diff-new">allowed to navigate</ins></dfn> <ins class="diff-new">a second</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> <var title=""><ins class="diff-new">B</ins></var> <ins class= "diff-new">if one of the following conditions is true:</ins> <ul> <li><ins class="diff-new">Either the</ins> <a href= "#origin0"><ins class="diff-new">origin</ins></a> <ins class= "diff-new">of the</ins> <a href="#active"><ins class= "diff-new">active document</ins></a> <ins class="diff-new">of</ins> <var title=""><ins class="diff-new">A</ins></var> <ins class= "diff-new">is the</ins> <a href="#same-origin" title= "same origin"><ins class="diff-new">same</ins></a> <ins class= "diff-new">as the</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">of the</ins> <a href="#active"><ins class="diff-new">active document</ins></a> <ins class="diff-new">of</ins> <var title=""><ins class= "diff-new">B</ins></var> ,<ins class="diff-new">or</ins></li> <li><ins class="diff-new">The browsing context</ins> <var title= ""><ins class="diff-new">B</ins></var> <ins class= "diff-new">an</ins> <a href="#auxiliary0"><ins class= "diff-new">auxiliary browsing context</ins></a> <ins class= "diff-new">and either its</ins> <a href="#opener"><ins class= "diff-new">opener browsing context</ins></a> <ins class= "diff-new">is</ins> <var title=""><ins class= "diff-new">A</ins></var> <ins class="diff-new">or</ins> <var title= ""><ins class="diff-new">A</ins></var> <ins class= "diff-new">is</ins> <a href="#allowed"><ins class= "diff-new">allowed to navigate</ins></a> <var title=""><ins class= "diff-new">B</ins></var> <ins class="diff-new">'s</ins> <a href= "#opener"><ins class="diff-new">opener browsing context</ins></a> ,<ins class="diff-new">or</ins></li> <li><ins class="diff-new">The browsing context</ins> <var title= ""><ins class="diff-new">B</ins></var> <ins class="diff-new">is not a</ins> <a href="#top-level"><ins class="diff-new">top-level browsing context</ins></a> ,<ins class="diff-new">but there exists an</ins> <a href="#ancestor"><ins class="diff-new">ancestor browsing context</ins></a> <ins class="diff-new">of</ins> <var title=""><ins class="diff-new">B</ins></var> <ins class= "diff-new">whose</ins> <a href="#active"><ins class= "diff-new">active document</ins></a> <ins class="diff-new">has the</ins> <a href="#same-origin" title="same origin"><ins class= "diff-new">same</ins></a> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">as the</ins> <a href="#active"><ins class="diff-new">active document</ins></a> <ins class="diff-new">of</ins> <var title=""><ins class= "diff-new">A</ins></var> <ins class="diff-new">(possibly in fact being</ins> <var title=""><ins class="diff-new">A</ins></var> <ins class="diff-new">itself).</ins></li> </ul> <h4 id="threads"><del class= "diff-old">4.1.4.</del> <ins class="diff-chg">4.1.5</ins> Threads</h4> Each <a href="#browsing1">browsing context</a> is defined as having a list of zero or more <dfn id="directly">directly reachable browsing contexts</dfn> . These are: <ul> <li>All the <a href="#browsing1">browsing context</a> 's <a href= "#child" title="child browsing context">child browsing contexts</a> .</li> <li>The <a href="#browsing1">browsing context</a> 's <a href= "#parent">parent browsing context</a> .</li> <li>All the <a href="#browsing1" title="browsing context">browsing contexts</a> that have the <a href="#browsing1">browsing context</a> as their <a href="#opener">opener browsing context</a> .</li> <li>The <a href="#browsing1">browsing context</a> 's <a href= "#opener">opener browsing context</a> .</li> </ul> The transitive closure of all the <a href="#browsing1" title= "browsing context">browsing contexts</a> that are <a href= "#directly">directly reachable browsing contexts</a> <del class= "diff-old">consists of</del> <ins class="diff-chg">forms</ins> a <dfn id="unit-of">unit of related browsing contexts</dfn> . All the executable code in a <a href="#unit-of">unit of related browsing contexts</a> must execute on a single conceptual thread. The dispatch of events fired by the user agent (e.g. in response to user actions or network activity) and the execution of any scripts associated with timers must be <del class= "diff-old">serialised</del> <ins class="diff-chg">serialized</ins> so that for each <a href="#unit-of">unit of related browsing contexts</a> there is only one script being executed at a time. <h4 id="browsing"><del class= "diff-old">4.1.5.</del> <ins class="diff-chg">4.1.6</ins> Browsing context names</h4> Browsing contexts can have a <dfn id="browsing2">browsing context name</dfn> . By default, a browsing context has no name (its name is not set). A <dfn id="valid8">valid browsing context name</dfn> is any string <ins class="diff-new">with at least one character</ins> that does not start with a U+005F LOW LINE <del class= "diff-old">character, or, a</del> <ins class="diff-chg">character. (Names starting with an underscore are reserved for special keywords.)</ins> <ins class="diff-chg">A</ins> <dfn id="valid9"><ins class= "diff-chg">valid browsing context name or keyword</ins></dfn> <ins class="diff-chg">is any</ins> string that <ins class= "diff-new">is either a</ins> <a href="#valid8"><ins class= "diff-new">valid browsing context name</ins></a> <ins class= "diff-new">or that</ins> case-insensitively matches one of: <code title=""><ins class="diff-new">_blank</ins></code> ,<code title="">_self</code> , <code title="">_parent</code> , or <code title="">_top</code> . <del class="diff-old">(Names starting with an underscore are reserved for special keywords.)</del> <dfn id="the-rules">The rules for <del class= "diff-old">chosing</del> <ins class="diff-chg">choosing</ins> a browsing context given a browsing context name</dfn> are as follows. The rules assume that they are being applied in the context of a <a href="#browsing1">browsing context</a> . <ol> <li> If the given browsing context name is the empty string or <code title="">_self</code> , then the chosen browsing context must be the current one. </li> <li> If the given browsing context name is <code title= "">_parent</code> , then the chosen browsing context must be the <a href="#parent">parent browsing context</a> of the current one, unless there isn't one, in which case the chosen browsing context must be the current browsing context. </li> <li> If the given browsing context name is <code title="">_top</code> , then the chosen browsing context must be the most <a href= "#top-level">top-level browsing context</a> of the current one. </li> <li> If the given browsing context name is not <code title= "">_blank</code> and there exists a browsing context whose <a href= "#browsing2" title="browsing context name">name</a> is the same as the given browsing context name, and <del class="diff-old">one of the following is true: Either the origin of that browsing context's active document is the same as the origin of</del> the current browsing <del class="diff-old">context's active document , Or that browsing</del> context is <del class="diff-old">an auxiliary browsing context and its opener browsing context</del> <a href= "#allowed"><ins class="diff-chg">allowed to navigate</ins></a> <del class="diff-old">is either the current browsing context or a browsing context</del> that <del class="diff-old">the user agent considers is closely enough related to the current</del> browsing context, <del class="diff-old">Or that browsing context is not a top-level browsing context ,</del> and the <del class= "diff-old">origin of the active document of the parent browsing context of that browsing context is the same as the origin of the current browsing context's active document , ...and the</del> user agent determines that the two browsing contexts are related enough that it is ok if they reach each other, then that browsing context must be the chosen one. If there are multiple matching browsing contexts, the user agent should select one in some arbitrary consistent manner, such as the most recently opened, most recently focused, or more closely related. </li> <li> Otherwise, a new browsing context is being requested, and what happens depends on the user agent's configuration and/or abilities: <dl> <dt id="sandboxWindowOpen"><ins class="diff-new">If the current browsing context has the</ins> <a href="#sandboxed"><ins class= "diff-new">sandboxed navigation browsing context flag</ins></a> <ins class="diff-new">set.</ins></dt> <dd><ins class="diff-new">The user agent may offer to create a new</ins> <a href="#top-level"><ins class="diff-new">top-level browsing context</ins></a> <ins class="diff-new">or reuse an existing</ins> <a href="#top-level"><ins class="diff-new">top-level browsing context</ins></a> .<ins class="diff-new">If the user picks one of those options, then the designated browsing context must be the chosen one (the browsing context's name isn't set to the given browsing context name). Otherwise (if the user agent doesn't offer the option to the user, or if the user declines to allow a browsing context to be used) there must not be a chosen browsing context.</ins></dd> <dt>If the user agent has been configured such that in this instance it will create a new browsing context</dt> <dd>A new <a href="#auxiliary0">auxiliary browsing context</a> must be created, with the <a href="#opener">opener browsing context</a> being the current one. If the given browsing context name is not <code title="">_blank</code> , then the new auxiliary browsing context's name must be the given browsing context name (otherwise, it has no name). The chosen browsing context must be this new browsing context. If it is immediately <a href="#navigate" title= "navigate">navigated</a> , then the navigation will be done with <a href="#replacement">replacement enabled</a> .</dd> <dt>If the user agent has been configured such that in this instance it will reuse the current browsing context</dt> <dd>The chosen browsing context is the current browsing context.</dd> <dt>If the user agent has been configured such that in this instance it will not find a browsing context</dt> <dd>There must not be a chosen browsing context.</dd> </dl> <ins class="diff-new">User agent implementors are encouraged to provide a way for users to configure the user agent to always reuse the current browsing context.</ins> </li> </ol> <h3 id="the-default0"><del class= "diff-old">4.2.</del> <ins class="diff-chg">4.2</ins> The default view</h3> The <code>AbstractView</code> object of <a href="#default3" title="default view">default views</a> must also implement the <code><a href="#window">Window</a></code> object. <del class= "diff-old">{</del> <pre class="idl"> [NoInterfaceObject] interface <dfn id="window">Window</dfn> { // the current browsing context readonly attribute <a href="#window">Window</a> <a href= "#window0" title="dom-window">window</a>; readonly attribute <a href="#window">Window</a> <a href="#self" title="dom-self">self</a>; <del class="diff-old"> attribute DOMString ; readonly attribute ; readonly attribute ; </del> <ins class="diff-chg"> attribute DOMString <a href= "#name9" title="dom-name">name</a>; [PutForwards=href] readonly attribute <a href= "#location2">Location</a> <a href="#location0" title= "dom-document-location">location</a>; readonly attribute <a href="#history2">History</a> <a href= "#history1" title="dom-history">history</a>; </ins> readonly attribute <a href= "#undomanager">UndoManager</a> <a href="#undomanager0" title= "dom-undoManager">undoManager</a>; <a href="#selection1">Selection</a> <a href="#getselection" title="dom-getSelection">getSelection</a>(); // the user agent readonly attribute <a href= "#clientinformation">ClientInformation</a> <a href="#navigator" title="dom-navigator">navigator</a>; readonly attribute <a href="#storage0">Storage</a> <a href= "#sessionstorage" title="dom-sessionStorage">sessionStorage</a>; <del class="diff-old"> readonly attribute ; </del> <ins class="diff-chg"> readonly attribute <a href= "#storage0">Storage</a> <a href="#localstorage" title= "dom-localStorage">localStorage</a>; </ins> <a href="#database0">Database</a> <a href="#opendatabase" title= "dom-opendatabase">openDatabase</a>(in DOMString name, in DOMString version, in DOMString displayName, in unsigned long estimatedSize); <del class="diff-old"> // modal user prompts </del> <ins class="diff-chg"> // user prompts </ins> void <a href="#alert" title= "dom-alert">alert</a>(in DOMString message); boolean <a href="#confirm" title= "dom-confirm">confirm</a>(in DOMString message); DOMString <a href="#prompt" title= "dom-prompt">prompt</a>(in DOMString message); DOMString <a href="#prompt" title= "dom-prompt">prompt</a>(in DOMString message, in DOMString default); void <a href="#print" title="dom-print">print</a>(); <ins class="diff-new"> any <a href="#showmodaldialog" title= "dom-showModalDialog">showModalDialog</a>(in DOMString url); any <a href="#showmodaldialog" title= "dom-showModalDialog">showModalDialog</a>(in DOMString url, in any arguments); void <a href="#shownotification" title= "dom-showNotification">showNotification</a>(in DOMString title, in DOMString subtitle, in DOMString description); void <a href="#shownotification" title= "dom-showNotification">showNotification</a>(in DOMString title, in DOMString subtitle, in DOMString description, in VoidCallback onclick); </ins> // other browsing contexts readonly attribute <a href="#window">Window</a> <a href="#frames" title="dom-frames">frames</a>; <del class="diff-old"> readonly attribute unsigned long ; </del> <ins class="diff-chg"> readonly attribute unsigned long <a href= "#length6" title="dom-length">length</a>; [IndexGetter] <a href="#window">Window</a> <a href="#xxx4index" title="dom-XXX4">XXX4</a>(in unsigned long index); </ins> readonly attribute <a href="#window">Window</a> <a href= "#opener0" title="dom-opener">opener</a>; <a href="#window">Window</a> <a href="#open2" title= "dom-open">open</a>(); <a href="#window">Window</a> <a href="#open2" title= "dom-open">open</a>(in DOMString url); <a href="#window">Window</a> <a href="#open2" title= "dom-open">open</a>(in DOMString url, in DOMString target); <a href="#window">Window</a> <a href="#open2" title= "dom-open">open</a>(in DOMString url, in DOMString target, in DOMString features); <a href="#window">Window</a> <a href="#open2" title= "dom-open">open</a>(in DOMString url, in DOMString target, in DOMString features, in DOMString replace); // <a href="#cross-document">cross-document messaging</a> <del class="diff-old"> void (in DOMString message); </del> <ins class="diff-chg"> void <a href="#postmessage" title= "dom-window-postMessage">postMessage</a>(in DOMString message, in DOMString targetOrigin); </ins> <del class="diff-old"> // </del> <ins class="diff-chg"> // <a href= "#event4">event handler DOM attributes</a> </ins> attribute EventListener <a href="#onabort" title="handler-onabort">onabort</a>; attribute EventListener <a href= "#onbeforeunload" title= "handler-onbeforeunload">onbeforeunload</a>; attribute EventListener <a href="#onblur" title="handler-onblur">onblur</a>; attribute EventListener <a href="#onchange" title="handler-onchange">onchange</a>; attribute EventListener <a href="#onclick" title="handler-onclick">onclick</a>; attribute EventListener <a href= "#oncontextmenu" title="handler-oncontextmenu">oncontextmenu</a>; attribute EventListener <a href= "#ondblclick" title="handler-ondblclick">ondblclick</a>; attribute EventListener <a href="#ondrag" title="handler-ondrag">ondrag</a>; attribute EventListener <a href= "#ondragend" title="handler-ondragend">ondragend</a>; attribute EventListener <a href= "#ondragenter" title="handler-ondragenter">ondragenter</a>; attribute EventListener <a href= "#ondragleave" title="handler-ondragleave">ondragleave</a>; attribute EventListener <a href= "#ondragover" title="handler-ondragover">ondragover</a>; attribute EventListener <a href= "#ondragstart" title="handler-ondragstart">ondragstart</a>; attribute EventListener <a href="#ondrop" title="handler-ondrop">ondrop</a>; attribute EventListener <a href="#onerror" title="handler-onerror">onerror</a>; attribute EventListener <a href="#onfocus" title="handler-onfocus">onfocus</a>; attribute EventListener <a href= "#onkeydown" title="handler-onkeydown">onkeydown</a>; attribute EventListener <a href= "#onkeypress" title="handler-onkeypress">onkeypress</a>; attribute EventListener <a href="#onkeyup" title="handler-onkeyup">onkeyup</a>; attribute EventListener <a href="#onload" title="handler-onload">onload</a>; attribute EventListener <a href= "#onmessage" title="handler-onmessage">onmessage</a>; attribute EventListener <a href= "#onmousedown" title="handler-onmousedown">onmousedown</a>; attribute EventListener <a href= "#onmousemove" title="handler-onmousemove">onmousemove</a>; attribute EventListener <a href= "#onmouseout" title="handler-onmouseout">onmouseout</a>; attribute EventListener <a href= "#onmouseover" title="handler-onmouseover">onmouseover</a>; attribute EventListener <a href= "#onmouseup" title="handler-onmouseup">onmouseup</a>; attribute EventListener <a href= "#onmousewheel" title="handler-onmousewheel">onmousewheel</a>; attribute EventListener <a href="#onresize" title="handler-onresize">onresize</a>; attribute EventListener <a href="#onscroll" title="handler-onscroll">onscroll</a>; attribute EventListener <a href="#onselect" title="handler-onselect">onselect</a>; <ins class= "diff-new"> attribute EventListener <a href= "#onstorage" title="handler-onstorage">onstorage</a>; </ins> attribute EventListener <a href="#onsubmit" title="handler-onsubmit">onsubmit</a>; attribute EventListener <a href="#onunload" title="handler-onunload">onunload</a>; }; </pre> The <dfn id="window0" title= "dom-window"><code>window</code></dfn> , <dfn id="frames" title= "dom-frames"><code>frames</code></dfn> , and <dfn id="self" title= "dom-self"><code>self</code></dfn> DOM attributes must all return the <code><a href="#window">Window</a></code> object itself. The <code><a href="#window">Window</a></code> object also provides the scope for script execution. Each <code>Document</code> in a <a href="#browsing1">browsing context</a> has an associated <dfn id="list-of2">list of added properties</dfn> which, when a document is <a href="#active" title="active document">active</a> , are available on the <code>Document</code> 's <a href= "#default3">default view</a> <code><a href= "#window">Window</a></code> object. A <code>Document</code> object's <a href="#list-of2">list of added properties</a> must be empty when the <code>Document</code> object is created. Objects implementing the <code><a href= "#window">Window</a></code> interface must also implement the <code>EventTarget</code> interface. <code><a href="#window">Window</a></code> objects also have an implicit [[Get]] method which returns nested browsing contexts . <h4 id="security3"><del class= "diff-old">4.2.1.</del> <ins class="diff-chg">4.2.1</ins> Security</h4> User agents must raise a <a href="#security9">security exception</a> whenever any of the members of a <code><a href= "#window">Window</a></code> object are accessed by scripts whose <a href="#effective3"><ins class="diff-chg">effective script</ins> origin</a> is not the same as the <code><a href= "#window">Window</a></code> object's <a href="#browsing1">browsing context</a> 's <a href="#active">active document</a> 's <del class= "diff-old">origin,</del> <a href="#effective3"><ins class= "diff-chg">effective script origin</ins></a> , with the following exceptions: <ul> <li>The <code title="dom-location"><a href= "#location1">location</a></code> object</li> <li>The <code title="dom-window-postMessage"><a href= "#postmessage">postMessage()</a></code> method</li> <li><ins class="diff-new">The</ins> <code title= "dom-window-frames"><ins class="diff-new">frames</ins></code> <ins class="diff-new">attribute</ins></li> <li><ins class="diff-new">The</ins> <code title="dom-XXX4"><a href= "#xxx4index"><ins class="diff-new">XXX4</ins></a></code> <ins class="diff-new">method</ins></li> </ul> User agents must not allow scripts to override the <code title= "dom-location"><a href="#location1">location</a></code> object's setter. <h4 id="constructors"><del class= "diff-old">4.2.2.</del> <ins class="diff-chg">4.2.2</ins> Constructors</h4> All <code><a href="#window">Window</a></code> objects must provide the following constructors: <dl> <dt><dfn id="audio2" title= "dom-audio"><code>Audio()</code></dfn></dt> <dt><dfn id="audio3" title="dom-audio-s"><code>Audio( <var title= "">src</var> )</code></dfn></dt> <dd> When invoked as constructors, these must return a new <code><a href="#htmlaudioelement">HTMLAudioElement</a></code> object (a new <code><a href="#audio1">audio</a></code> element). If the <var title="src">src</var> argument is present, the object created must have its <code title="dom-media-src"><a href= "#src8">src</a></code> content attribute set to the provided value, and the user agent must invoke the <code title= "dom-media-load"><a href="#load">load()</a></code> method on the object before returning. </dd> <dt><dfn id="image0" title= "dom-image"><code>Image()</code></dfn></dt> <dt><dfn id="imagein" title="dom-image-w"><code>Image(in unsigned long <var title="">w</var> )</code></dfn></dt> <dt><dfn id="imagein0" title="dom-image-wh"><code>Image(in unsigned long <var title="">w</var> , in unsigned long <var title="">h</var> )</code></dfn></dt> <dd> When invoked as <del class="diff-old">corstructors,</del> <ins class="diff-chg">constructors,</ins> these must return a new <code><a href="#htmlimageelement">HTMLImageElement</a></code> object (a new <code><a href="#img">img</a></code> element). If the <var title="">h</var> argument is present, the new object's <code title="attr-img-height">height</code> content attribute must be set to <var title="">h</var> . If the <var title="">w</var> argument is present, the new object's <code title= "attr-img-width">width</code> content attribute must be set to <var title="">w</var> . </dd> <dt><dfn id="option" title= "dom-option"><code>Option()</code></dfn></dt> <dt><dfn id="optionin" title="dom-option-n"><code>Option(in DOMString <var title="">name</var> )</code></dfn></dt> <dt><dfn id="optionin0" title="dom-option-nv"><code>Option(in DOMString <var title="">name</var> , in DOMString <var title= "">value</var> )</code></dfn></dt> <dd> When invoked as constructors, these must return a new <code>HTMLOptionElement</code> object (a new <code>option</code> element). need to define argument processing </dd> </dl> And when constructors are invoked but without using the constructor syntax...? <h4 id="apis-for"><del class= "diff-old">4.2.3.</del> <ins class="diff-chg">4.2.3</ins> APIs for creating and navigating browsing contexts by name</h4> The <dfn id="open2" title="dom-open"><code>open()</code></dfn> method on <code><a href="#window">Window</a></code> objects provides a mechanism for <a href="#navigate" title= "navigate">navigating</a> an existing <a href="#browsing1">browsing context</a> or opening and navigating an <a href= "#auxiliary0">auxiliary browsing context</a> . The method has four arguments, though they are all optional. The first argument, <var title="">url</var> , gives a URI (or IRI) for a page to load in the browsing context. If no arguments are provided, then the <var title="">url</var> argument defaults to " <code>about:blank</code> ". The argument must be resolved to an absolute URI by ... The second argument, <var title="">target</var> , specifies the <a href="#browsing2" title="browsing context name">name</a> of the browsing context that is to be navigated. It must be a <a href= "#valid9">valid browsing context name <ins class="diff-new">or keyword</ins></a> . If fewer than two arguments are provided, then the <var title="">name</var> argument defaults to the value " <code>_blank</code> ". The third argument, <var title="">features</var> , has no effect and is supported for historical reasons only. The fourth argument, <var title="">replace</var> , specifies whether or not the new page will <a href="#replacement" title= "replacement enabled">replace</a> the page currently loaded in the browsing context, when <var title="">target</var> identifies an existing browsing context (as opposed to leaving the current page in the browsing context's <a href="#session">session history</a> ). When three or fewer arguments are provided, <var title= "">replace</var> defaults to false. When the method is invoked, the user agent must first select a <a href="#browsing1">browsing context</a> to navigate by applying <a href="#the-rules">the rules for <del class= "diff-old">chosing</del> <ins class="diff-chg">choosing</ins> a browsing context given a browsing context name</a> using the <var title="">target</var> argument as the name and the <a href= "#browsing1">browsing context</a> of the script as the context in which the algorithm is executed, unless the user has indicated a preference, in which case the browsing context to navigate may instead be the one indicated by the user. For example, suppose there is a user agent that supports control-clicking a link to open it in a new tab. If a user clicks in that user agent on an element whose <code title= "handler-onclick"><a href="#onclick">onclick</a></code> handler uses the <code title="dom-open"><a href= "#open2">window.open()</a></code> API to open a page in an iframe, but, while doing so, holds the control key down, the user agent could override the selection of the target browsing context to instead target a new tab. Then, the user agent must <a href="#navigate">navigate</a> the selected <a href="#browsing1">browsing context</a> to the URI given in <var title="">url</var> . If the <var title="">replace</var> is true, then <a href="#replacement" title= "replacement enabled">replacement must be enabled</a> ; otherwise, it must not be enabled unless the <a href="#browsing1">browsing context</a> was just created as part of the <a href= "#the-rules">the rules for <del class="diff-old">chosing</del> <ins class="diff-chg">choosing</ins> a browsing context given a browsing context name</a> . <ins class="diff-new">The navigation must be done with the</ins> <a href="#browsing1"><ins class= "diff-new">browsing context</ins></a> <ins class= "diff-new">corresponding to the</ins> <code><a href= "#window"><ins class="diff-new">Window</ins></a></code> <ins class= "diff-new">object that is the</ins> <a href="#script2"><ins class= "diff-new">script execution context</ins></a> <ins class= "diff-new">of the script that invoked the method as the</ins> <a href="#source0"><ins class="diff-new">source browsing context</ins></a> . <ins class="diff-new">If the</ins> <a href= "#script2"><ins class="diff-new">script execution context</ins></a> <ins class="diff-new">of a script isn't a</ins> <code><a href= "#window"><ins class="diff-new">Window</ins></a></code> <ins class= "diff-new">object, then it can't ever get to a</ins> <code><a href= "#window"><ins class="diff-new">Window</ins></a></code> <ins class= "diff-new">object to call this method.</ins> The method must return the <code><a href= "#window">Window</a></code> object of the default view of the <a href="#browsing1">browsing context</a> that was navigated, or null if no browsing context was navigated. The <dfn id="name9" title="dom-name"><code>name</code></dfn> attribute of the <code><a href="#window">Window</a></code> object must, on getting, return the current name of the <a href= "#browsing1">browsing context</a> , and, on setting, set the name of the <a href="#browsing1">browsing context</a> to the new value. The name <a href="#resetBCName">gets reset</a> when the browsing context is navigated to another domain. <h4 id="accessing"><del class= "diff-old">4.2.4.</del> <ins class="diff-chg">4.2.4</ins> Accessing other browsing contexts</h4> <del class="diff-old">In ECMAScript implementations, objects that implement</del> <ins class="diff-chg">The</ins> <dfn id= "length6" title="dom-length"><code><ins class= "diff-chg">length</ins></code></dfn> <ins class="diff-chg">DOM attribute on</ins> the <code><a href="#window">Window</a></code> interface must <del class="diff-old">have a [[Get]] method that, when invoked with a property name that is a number i , returns</del> <ins class="diff-chg">return</ins> the <del class= "diff-old">i th</del> <ins class="diff-chg">number of</ins> <a href="#child" title="child browsing context">child browsing <del class="diff-old">context</del> <ins class= "diff-chg">contexts</ins></a> of the <a href="#active" title= "active document">active</a> <code>Document <del class="diff-old">, sorted in document order of the elements nesting those browsing contexts.</del></code> . The <dfn id="xxx4index" title="dom-XXX4"><code><del class= "diff-old">length</del> <ins class="diff-chg">XXX4(</ins> <var title=""><ins class="diff-chg">index</ins></var> <ins class= "diff-chg">)</ins></code></dfn> <del class="diff-old">DOM attribute on the Window interface</del> <ins class="diff-chg">method</ins> must return the <del class="diff-old">number of</del> <var title= ""><ins class="diff-chg">index</ins></var> <ins class= "diff-chg">th</ins> <a href="#child">child browsing <del class= "diff-old">contexts</del> <ins class="diff-chg">context</ins></a> of the <a href="#active" title="active document">active</a> <code>Document <del class="diff-old">.</del></code> , <ins class= "diff-chg">sorted in document order of the elements nesting those browsing contexts.</ins> <h3 id="origin"><del class= "diff-old">4.3.</del> <ins class="diff-chg">4.3</ins> <del class="diff-old">Scripting</del> <ins class= "diff-chg">Origin</ins></h3> <del class="diff-old">4.3.1. Running executable code</del> <del class="diff-old">Various mechanisms can cause author-provided executable code to run in</del> <ins class= "diff-chg">The</ins> <dfn id="origin0"><ins class= "diff-chg">origin</ins></dfn> <ins class="diff-chg">of a resource and</ins> the <del class="diff-old">context</del> <dfn id= "effective3"><ins class="diff-chg">effective script origin</ins></dfn> of a <del class="diff-old">document. These mechanisms include, but</del> <ins class="diff-chg">resource</ins> are <del class="diff-old">probably not limited to: Processing</del> <ins class="diff-chg">both either opaque identifiers or tuples consisting</ins> of <ins class="diff-chg">a scheme component, a host component, and a port component.</ins> <ins class="diff-chg">These characteristics are defined as follows:</ins> <dl> <dt><ins class="diff-chg">For URIs</ins></dt> <dd> <ins class="diff-chg">The</ins> <a href="#origin0"><ins class= "diff-chg">origin</ins></a> <ins class="diff-chg">and</ins> <a href="#effective3"><ins class="diff-chg">effective</ins> script <ins class="diff-new">origin</ins></a> <del class= "diff-old">elements. Processing</del> of <del class= "diff-old">inline javascript:</del> <ins class="diff-chg">the URI is whatever is returned by the following algorithm:</ins> <ol> <li> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">uri</ins></var> <ins class="diff-chg">be the URI for which the</ins> <a href="#origin0"><ins class= "diff-chg">origin</ins></a> <del class="diff-old">URIs (e.g.</del> <ins class="diff-chg">is being determined.</ins> </li> <li> <ins class="diff-chg">Parse</ins> <var title=""><ins class= "diff-chg">uri</ins></var> <ins class="diff-chg">according to</ins> the <del class="diff-old">src</del> <ins class="diff-chg">rules described in RFC 3986 and RFC 3987.</ins> <a href= "#references"><ins class="diff-chg">[RFC3986]</ins></a> <del class= "diff-old">attribute of img</del> <a href="#references"><ins class= "diff-chg">[RFC3987]</ins></a> <del class="diff-old">elements, or an</del> </li> <li> <ins class="diff-chg">If</ins> <var title=""><ins class= "diff-chg">uri</ins></var> <ins class="diff-chg">does not use a server-based naming authority, then return a new globally unique identifier.</ins> </li> <li> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">scheme</ins></var> <ins class="diff-chg">be the <scheme> component of the URI, converted to lowercase. If the UA doesn't support the given protocol, then return a new globally unique identifier.</ins> </li> <li> <ins class="diff-chg">If the scheme is "</ins> <code title= ""><del class="diff-old">@import</del> <ins class= "diff-chg">file</ins></code> <del class="diff-old">rule in</del> <ins class="diff-chg">", then the user agent may return</ins> a <del class="diff-old">CSS style element block).</del> <ins class= "diff-chg">UA-specific value.</ins> </li> <li><del class="diff-old">Event handlers, whether registered through</del> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">host</ins></var> <ins class="diff-chg">be</ins> the <del class="diff-old">DOM using addEventListener() , by explicit event handler content attributes , by event handler DOM attributes , or otherwise.</del> <ins class= "diff-chg"><host>/<ihost> component of the URI.</ins> </li> <li><del class="diff-old">Processing</del> <ins class="diff-chg">Apply the IDNA ToASCII algorithm to</ins> <var title=""><ins class="diff-chg">host</ins></var> ,<ins class= "diff-chg">with both the AllowUnassigned and UseSTD3ASCIIRules flags set. Let</ins> <var title=""><ins class= "diff-chg">host</ins></var> <ins class="diff-chg">be the result</ins> of <del class="diff-old">technologies like XBL or SVG that have their own scripting features.</del> <ins class= "diff-chg">the ToASCII algorithm.</ins> <del class="diff-old">User agents may provide a mechanism</del> <ins class="diff-chg">If ToASCII fails</ins> to <del class= "diff-old">enable or disable</del> <ins class="diff-chg">convert one of</ins> the <del class="diff-old">execution</del> <ins class= "diff-chg">components</ins> of <del class= "diff-old">author-provided code. When</del> the <del class= "diff-old">user agent</del> <ins class="diff-chg">string, e.g. because it</ins> is <del class="diff-old">configured such that author-provided code does not execute,</del> <ins class= "diff-chg">too long</ins> or <del class="diff-old">if the user agent is implemented so as to never execute author-provided code,</del> <ins class="diff-chg">because</ins> it <del class= "diff-old">is said that scripting is disabled . When author-provided code does execute, scripting is enabled . A user agent with scripting disabled is</del> <ins class= "diff-chg">contains invalid characters, then return</ins> a <del class="diff-old">user agent with no scripting support</del> <ins class="diff-chg">new globally unique identifier.</ins> <a href="#references"><ins class="diff-chg">[RFC3490]</ins></a> <del class="diff-old">for the purposes of conformance.</del> <del class="diff-old">4.3.2. Origin</del> </li> <li> <del class="diff-old">Access</del> <ins class= "diff-chg">Let</ins> <var title=""><ins class= "diff-chg">host</ins></var> <ins class="diff-chg">be the result of converting</ins> <var title=""><ins class= "diff-chg">host</ins></var> to <del class="diff-old">certain APIs</del> <ins class="diff-chg">lowercase.</ins> </li> <li> <ins class="diff-chg">If no port</ins> is <del class= "diff-old">granted or denied to scripts based on</del> <ins class= "diff-chg">explicitly listed, then let</ins> <var title= ""><ins class="diff-chg">port</ins></var> <ins class= "diff-chg">be</ins> the <del class="diff-old">origin</del> <ins class="diff-chg">default port for the protocol given by</ins> <var title=""><ins class="diff-chg">scheme</ins></var> .<ins class= "diff-chg">Otherwise, let</ins> <var title=""><ins class= "diff-chg">port</ins></var> <ins class="diff-chg">be the <port> component</ins> of the <del class="diff-old">script and</del> <ins class="diff-chg">URI.</ins> </li> <li> <ins class="diff-chg">Return</ins> the <del class="diff-old">API being accessed.</del> <ins class="diff-chg">tuple (</ins> <var title=""><ins class="diff-chg">scheme</ins></var> ,<var title= ""><ins class="diff-chg">host</ins></var> ,<var title= ""><ins class="diff-chg">port</ins></var> <ins class= "diff-chg">).</ins> </li> </ol> </dd> <dt><ins class="diff-chg">For scripts</ins></dt> <dd> The <a href="#origin0"><ins class="diff-new">origin</ins></a> <ins class="diff-new">and</ins> <a href="#effective3"><ins class= "diff-new">effective script</ins> origin</a> of a script <del class="diff-old">depends on</del> <ins class="diff-chg">are determined from another resource, called</ins> the <del class= "diff-old">context of that script:</del> <ins class= "diff-chg">owner</ins> : <dl class="switch"> <dt>If a script is in a <code><a href="#script1">script</a></code> element</dt> <dd>The <del class="diff-old">origin of the script</del> <ins class="diff-chg">owner</ins> is the <del class= "diff-old">origin of the</del> <code>Document</code> to which the <code><a href="#script1">script</a></code> element belongs.</dd> <dt>If a script is a function or other code reference created by another script</dt> <dd>The <del class="diff-old">origin of</del> <ins class= "diff-chg">owner is</ins> the script <ins class="diff-new">that created it.</ins></dd> <dt><ins class="diff-new">If a script</ins> is <ins class= "diff-new">a</ins> <a href="#the-javascript" title= "javascript protocol"><code title=""><ins class= "diff-new">javascript:</ins></code> <ins class= "diff-new">URI</ins></a> <ins class="diff-new">that was returned as</ins> the <del class="diff-old">origin</del> <ins class= "diff-chg">location</ins> of <ins class="diff-new">an HTTP redirect (or equivalent in other protocols)</ins></dt> <dd><ins class="diff-new">The owner is</ins> the <del class= "diff-old">script</del> <ins class="diff-chg">URI</ins> that <del class="diff-old">created it.</del> <ins class= "diff-chg">redirected to the</ins> <a href="#the-javascript" title= "javascript protocol"><code title=""><ins class= "diff-chg">javascript:</ins></code> <ins class= "diff-chg">URI</ins></a> .</dd> <dt>If a script is a <a href="#the-javascript" title= "javascript protocol"><code title="">javascript:</code> URI</a> in an attribute</dt> <dd>The <del class="diff-old">origin</del> <ins class= "diff-chg">owner</ins> is the <del class="diff-old">origin of the</del> <code>Document</code> of the element on which the attribute is found.</dd> <dt>If a script is a <a href="#the-javascript" title= "javascript protocol"><code title="">javascript:</code> URI</a> in a style sheet</dt> <dd>The <del class="diff-old">origin</del> <ins class= "diff-chg">owner</ins> is the <del class="diff-old">origin</del> <ins class="diff-chg">URI</ins> of the <del class= "diff-old">Document to which the</del> style <del class= "diff-old">sheet applies.</del> <ins class= "diff-chg">sheet.</ins></dd> <dt>If a script is a <a href="#the-javascript" title= "javascript protocol"><code title="">javascript:</code> URI</a> to which a <a href="#browsing1">browsing context</a> is being <a href= "#navigate" title="navigate">navigated</a> , the URI having been provided by the user (e.g. by using a bookmarklet )</dt> <dd>The <del class="diff-old">origin</del> <ins class= "diff-chg">owner</ins> is the <del class="diff-old">origin of the</del> <code>Document</code> of the <a href= "#browsing1">browsing context</a> 's <a href="#active">active document</a> .</dd> <dt>If a script is a <a href="#the-javascript" title= "javascript protocol"><code title="">javascript:</code> URI</a> to which a <a href="#browsing1">browsing context</a> is being <a href= "#navigate" title="navigate">navigated</a> , the URI having been declared in markup</dt> <dd>The <del class="diff-old">origin</del> <ins class= "diff-chg">owner</ins> is the <del class="diff-old">origin of the</del> <code>Document</code> of the element (e.g. an <code><a href="#a">a</a></code> or <code><a href= "#area">area</a></code> element) that declared the URI.</dd> <dt>If a script is a <a href="#the-javascript" title= "javascript protocol"><code title="">javascript:</code> URI</a> to which a <a href="#browsing1">browsing context</a> is being <a href= "#navigate" title="navigate">navigated</a> , the URI having been provided by script</dt> <dd>The <del class="diff-old">origin</del> <ins class= "diff-chg">owner</ins> is the <del class="diff-old">origin of the</del> script that provided the URI.</dd> </dl> The <a href="#origin0">origin</a> of <del class= "diff-old">scripts thus comes down</del> <ins class="diff-chg">the script is then equal</ins> to <del class="diff-old">finding</del> the <a href="#origin0"><ins class="diff-new">origin</ins></a> <ins class="diff-new">of the owner, and the</ins> <a href= "#effective3"><ins class="diff-new">effective script origin</ins></a> <ins class="diff-new">of the script is equal to the</ins> <a href="#effective3"><ins class="diff-new">effective script</ins> origin</a> of <ins class="diff-new">the owner.</ins> </dd> <dt><ins class="diff-new">For</ins> <code>Document</code> <del class="diff-old">objects.</del> <ins class="diff-chg">objects and images</ins></dt> <dd> <dl class="switch"> <dt id="sandboxOrigin"><ins class="diff-chg">If a</ins> <code><ins class="diff-chg">Document</ins></code> <ins class= "diff-chg">is in a</ins> <a href="#browsing1"><ins class= "diff-chg">browsing context</ins></a> <ins class= "diff-chg">whose</ins> <a href="#sandboxed2"><ins class= "diff-chg">sandboxed origin browsing context flag</ins></a> <ins class="diff-chg">is set</ins></dt> <dd>The <a href="#origin0">origin</a> <ins class="diff-new">is a globally unique identifier assigned when the</ins> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">is created.</ins></dd> <dt><ins class="diff-new">If a</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">or image was returned by the</ins> <code><ins class= "diff-new">XMLHttpRequest</ins></code> <ins class= "diff-new">API</ins></dt> <dd><ins class="diff-new">The</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">and</ins> <a href="#effective3"><ins class="diff-new">effective script origin</ins></a> <ins class="diff-new">are equal to the</ins> <a href="#origin0"><ins class="diff-new">origin</ins></a> <ins class="diff-new">and</ins> <a href="#effective3"><ins class= "diff-new">effective script origin</ins></a> <ins class= "diff-new">of the</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">object that was the</ins> <a href="#active"><ins class="diff-new">active document</ins></a> of <ins class="diff-new">the</ins> <code><a href="#window"><ins class= "diff-new">Window</ins></a></code> <ins class="diff-new">object of the browsing context from which the</ins> <code><ins class= "diff-new">XMLHttpRequest</ins></code> <ins class= "diff-new">constructor was invoked. (That is, they track the</ins> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">to which the</ins> <code><ins class= "diff-new">XMLHttpRequest</ins></code> <ins class= "diff-new">object's</ins> <a href= "http://dev.w3.org/2006/webapi/XMLHttpRequest-2/Overview.html#document-pointer"> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">pointer</ins></a> <ins class="diff-new">pointed when it was created.)</ins> <a href="#references"><ins class= "diff-new">[XHR]</ins></a></dd> <dt><ins class="diff-new">If</ins> a <code>Document</code> or image <ins class="diff-new">was generated from a</ins> <a href= "#the-javascript" title="javascript protocol"><code><ins class= "diff-new">javascript:</ins></code> <ins class= "diff-new">URI</ins></a></dt> <dd><ins class="diff-new">The</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">is equal to the</ins> <a href="#origin0"><ins class="diff-new">origin</ins></a> <ins class="diff-new">of the script of</ins> that <a href= "#the-javascript" title="javascript protocol"><code><ins class= "diff-new">javascript:</ins></code> <ins class= "diff-new">URI</ins></a> .</dd> <dt><ins class="diff-new">If a</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">or image</ins> was served over the network and <del class= "diff-old">whose</del> <ins class="diff-chg">has an</ins> address <ins class="diff-new">that</ins> uses a URI scheme with a server-based naming authority</dt> <dd><ins class="diff-new">The</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> is the <del class="diff-old">tuple consisting</del> <a href="#origin0"><ins class= "diff-chg">origin</ins></a> of the <del class= "diff-old"><scheme>, <host>/<ihost>, and <port> parts</del> <ins class="diff-chg">full URI</ins> of the <code>Document</code> <del class="diff-old">'s full URI. [RFC3986] [RFC3987]</del> <ins class="diff-chg">or image.</ins></dd> <dt><ins class="diff-chg">If a</ins> <code><ins class= "diff-chg">Document</ins></code> <ins class="diff-chg">or image was generated from a</ins> <code title=""><ins class= "diff-chg">data:</ins></code> <ins class="diff-chg">URI that was returned as the location of an HTTP redirect (or equivalent in other protocols)</ins></dt> <dd>The <a href="#origin0">origin</a> <ins class="diff-new">is the</ins> <a href="#origin0"><ins class="diff-new">origin</ins></a> of <ins class="diff-new">the URI that redirected to the</ins> <code title=""><ins class="diff-new">data:</ins></code> <ins class= "diff-new">URI.</ins></dd> <dt><ins class="diff-new">If</ins> a <code>Document</code> or image <del class="diff-old">that</del> was generated from a <code title= "">data:</code> URI found in another <code>Document</code> or in a script</dt> <dd><ins class="diff-new">The</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> is the <a href="#origin0">origin</a> of the <code>Document</code> or <del class="diff-old">script.</del> <ins class="diff-chg">script in which the</ins> <code title= ""><ins class="diff-chg">data:</ins></code> <ins class= "diff-chg">URI was found.</ins></dd> <dt><ins class="diff-chg">If a</ins> <code><ins class= "diff-chg">Document</ins></code> <ins class="diff-chg">has the URI "</ins> <code><ins class="diff-chg">about:blank</ins></code> <ins class="diff-chg">"</ins></dt> <dd>The <a href="#origin0">origin</a> of <ins class= "diff-new">the</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">is</ins> <a href="#about-blank-origin"><ins class="diff-new">the</ins> <ins class="diff-new">origin</ins> <ins class= "diff-new">it was assigned when its browsing context was created</ins></a> .</dd> <dt><ins class="diff-new">If</ins> a <code>Document</code> or image <del class="diff-old">that</del> was <del class= "diff-old">generated from</del> <ins class="diff-chg">obtained in some other manner (e.g. a</ins> <code title=""><ins class= "diff-chg">data:</ins></code> <ins class="diff-chg">URI typed in by the user,</ins> a <code><ins class="diff-new">Document</ins></code> <ins class="diff-new">created using the</ins> <code title= ""><ins class="diff-new">createDocument()</ins></code> <ins class= "diff-new">API, a</ins> <code title="">data:</code> URI <del class= "diff-old">from another source</del> <ins class="diff-chg">returned as the location of an HTTP redirect, etc)</ins></dt> <dd><ins class="diff-chg">The</ins> <a href="#origin0"><ins class= "diff-chg">origin</ins></a> is a globally unique identifier assigned when the <del class="diff-old">document is created. The origin of a</del> <code>Document</code> or image <del class= "diff-old">that was generated from</del> <ins class="diff-chg">is created.</ins></dd> </dl> <ins class="diff-chg">When</ins> a <code><del class= "diff-old">javascript:</del> <ins class= "diff-chg">Document</ins></code> <del class="diff-old">URI</del> <ins class="diff-chg">is created, unless stated otherwise above, its</ins> <a href="#effective3"><ins class="diff-chg">effective script origin</ins></a> is <ins class="diff-new">initialized to</ins> the <del class="diff-old">same as the</del> <a href= "#origin0">origin</a> of <del class="diff-old">that</del> <ins class="diff-chg">the</ins> <code><del class= "diff-old">javascript:</del> <ins class= "diff-chg">Document</ins></code> .<ins class="diff-chg">However, the</ins> <code title="dom-document-domain"><a href= "#domain"><ins class="diff-chg">document.domain</ins></a></code> <del class="diff-old">URI.</del> <ins class="diff-chg">attribute can be used to change it.</ins> </dd> </dl> The <dfn id="serialization0"><ins class="diff-new">serialization of an origin</ins></dfn> <ins class="diff-new">is the</ins> string <del class="diff-old">representing</del> <ins class= "diff-chg">obtained by applying</ins> the <del class= "diff-old">script's domain</del> <ins class="diff-chg">following algorithm to the given</ins> <a href="#origin0"><ins class= "diff-chg">origin</ins></a> : <ol> <li><ins class="diff-chg">If the</ins> <a href= "#origin0"><ins class="diff-chg">origin</ins></a> in <del class= "diff-old">IDNA format</del> <ins class="diff-chg">question</ins> is <del class="diff-old">obtained as follows: take</del> <ins class="diff-chg">not a scheme/host/port tuple, then return</ins> the <del class="diff-old">domain</del> <ins class= "diff-chg">empty string.</ins></li> <li><ins class="diff-chg">Otherwise, let</ins> <var title= ""><ins class="diff-chg">result</ins></var> <ins class= "diff-chg">be the scheme</ins> part of the <del class= "diff-old">script's</del> <a href="#origin0">origin</a> <del class= "diff-old">tuple and apply</del> <ins class= "diff-chg">tuple.</ins></li> <li><ins class="diff-chg">Append</ins> the <del class= "diff-old">IDNA ToASCII algorithm and then</del> <ins class= "diff-chg">string "</ins> <code title="">://</code><ins class= "diff-chg">" to</ins> <var title=""><ins class= "diff-chg">result</ins></var> .</li> <li><ins class="diff-chg">Apply</ins> the IDNA ToUnicode algorithm to each component of the <del class="diff-old">domain name (with both</del> <ins class="diff-chg">host part of</ins> the <del class= "diff-old">AllowUnassigned and UseSTD3ASCIIRules flags set both times). [RFC3490]</del> <a href="#origin0"><ins class= "diff-chg">origin</ins></a> <del class="diff-old">If ToASCII fails</del> <ins class="diff-chg">tuple, and append the results — each component, in the same order, separated by U+002E FULL STOP characters (".") —</ins> to <del class="diff-old">convert one of</del> <var title=""><ins class="diff-chg">result</ins></var> .</li> <li><ins class="diff-chg">If</ins> the <del class= "diff-old">components</del> <ins class="diff-chg">port part</ins> of the <del class="diff-old">string, e.g. because it is too long or because it contains invalid characters, or if the</del> <a href= "#origin0">origin <del class="diff-old">of</del></a> <ins class= "diff-chg">tuple gives a port that is different from</ins> the <del class="diff-old">script has no domain part, then</del> <ins class="diff-chg">default port for</ins> the <del class= "diff-old">string representing</del> <ins class="diff-chg">protocol given by</ins> the <del class="diff-old">script's domain in IDNA format cannot be obtained. (ToUnicode is defined to never fail.) It's been suggested that we should put IP addresses into</del> <ins class="diff-chg">scheme part of</ins> the <a href= "#origin0">origin</a> tuple, <del class="diff-old">to mitigate DNS rebinding attacks. However that would kill multi-homed systems like GMail. Should we do something like have</del> <ins class= "diff-chg">then append</ins> a <del class="diff-old">DNS record say whether or not to include</del> <ins class="diff-chg">U+003A COLON character (":") and</ins> the <del class="diff-old">IP</del> <ins class="diff-chg">given port,</ins> in <del class= "diff-old">the origin for a host? 4.3.3. Unscripted same-origin checks</del> <ins class="diff-chg">base ten, to</ins> <var title= ""><ins class="diff-chg">result</ins></var> .</li> <li><ins class="diff-chg">Return</ins> <var title=""><ins class= "diff-chg">result</ins></var> .</li> </ol> <del class="diff-old">When two URIs</del> <ins class= "diff-chg">Two</ins> <a href="#origin0" title="origin"><ins class= "diff-chg">origins</ins></a> are <ins class="diff-new">said</ins> to be <del class="diff-old">compared to determine if they have</del> the <dfn id="same-origin">same <del class= "diff-old">scheme/host/port , it means that</del> <ins class= "diff-chg">origin</ins></dfn> <ins class="diff-chg">if</ins> the following algorithm <del class="diff-old">must be invoked, where uri 1 and uri 2 are the two URIs.</del> <ins class= "diff-chg">returns true:</ins> <ol> <li> <del class="diff-old">First, both</del> <ins class= "diff-chg">Let</ins> <var title=""><del class="diff-old">uri 1</del> <ins class="diff-chg">A</ins></var> <ins class= "diff-new">be the first</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">being compared,</ins> and <var title=""><del class="diff-old">uri 2</del> <ins class="diff-chg">B</ins></var> <del class= "diff-old">must</del> be <del class="diff-old">normalized to obtain</del> the <del class="diff-old">two tuples ( scheme 1 , host 1 ,</del> <ins class="diff-chg">second</ins> <a href= "#origin0"><ins class="diff-chg">origin</ins></a> <ins class= "diff-chg">being compared.</ins> </li> <li> <ins class="diff-chg">If</ins> <var title=""><del class= "diff-old">port 1</del> <ins class="diff-chg">A</ins></var> <del class="diff-old">)</del> and <del class="diff-old">( scheme 2 ,</del> <var title=""><del class="diff-old">host 2 , port 2</del> <ins class="diff-chg">B</ins></var> <del class="diff-old">), by applying the following subalgorithm to each URI:</del> <ins class= "diff-chg">are both opaque identifiers, and their value is equal, then return true.</ins> </li> <li> <del class="diff-old">Let</del> <ins class="diff-chg">Otherwise, if either</ins> <var title=""><del class="diff-old">uri</del> <ins class="diff-chg">A</ins></var> <del class="diff-old">be the URI being normalized.</del> <ins class="diff-chg">or</ins> <var title=""><ins class="diff-chg">B</ins></var> <ins class= "diff-chg">or both are opaque identifiers, return false.</ins> </li> <li> <del class="diff-old">Parse</del> <ins class="diff-chg">If</ins> <var title=""><del class="diff-old">uri</del> <ins class= "diff-chg">A</ins></var> <del class="diff-old">according to the rules described in RFC 3986</del> and <del class="diff-old">RFC 3987. [RFC3986] [RFC3987]</del> <var title=""><ins class= "diff-chg">B</ins></var> <ins class="diff-chg">have scheme components that are not identical, return false.</ins> </li> <li> If <var title=""><del class="diff-old">uri</del> <ins class= "diff-chg">A</ins></var> <ins class="diff-chg">and</ins> <var title=""><ins class="diff-chg">B</ins></var> <del class= "diff-old">does not use a server-based naming authority, then fail the overall algorithm — the two URIs do not</del> have <del class= "diff-old">the same scheme/host/port.</del> <ins class= "diff-chg">host components that are not identical, return false.</ins> </li> <li> <del class="diff-old">Let</del> <ins class="diff-chg">If</ins> <var title=""><del class="diff-old">scheme</del> <ins class= "diff-chg">A</ins></var> <del class="diff-old">be</del> <ins class= "diff-chg">and</ins> <var title=""><ins class= "diff-chg">B</ins></var> <ins class="diff-chg">have port components that are not identical, return false.</ins> </li> <li> <ins class="diff-chg">Return true.</ins> </li> </ol> <h4 id="relaxing"><ins class= "diff-chg">4.3.1</ins> <ins class="diff-chg">Relaxing</ins> the <del class="diff-old"><scheme> component of</del> <ins class="diff-chg">same-origin restriction</ins></h4> <ins class="diff-chg">The</ins> <dfn id="domain" title= "dom-document-domain"><code><ins class= "diff-chg">domain</ins></code></dfn> <ins class= "diff-chg">attribute on</ins> <code><ins class= "diff-chg">Document</ins></code> <ins class="diff-chg">objects must be initialized to</ins> <a href="#domain0">the <del class= "diff-old">URI. If</del> <ins class="diff-chg">document's domain</ins></a> ,<ins class="diff-chg">if it has one, and</ins> the <del class="diff-old">UA doesn't support</del> <ins class= "diff-chg">empty string otherwise. On getting,</ins> the <del class="diff-old">given protocol, then fail</del> <ins class= "diff-chg">attribute must return its current value, unless</ins> the <del class="diff-old">overall algorithm —</del> <ins class= "diff-chg">document was created by</ins> <code><ins class= "diff-chg">XMLHttpRequest</ins></code> ,<ins class="diff-chg">in which case it must throw an</ins> <code><ins class= "diff-chg">INVALID_ACCESS_ERR</ins></code> <ins class= "diff-chg">exception. On setting,</ins> the <del class= "diff-old">two URIs do not have</del> <ins class="diff-chg">user agent must run</ins> the <del class="diff-old">same scheme/host/port .</del> <ins class="diff-chg">following algorithm:</ins> <ol> <li> <del class="diff-old">Let host be the <host>/<ihost> component of</del> <ins class="diff-chg">If</ins> the <del class= "diff-old">URI.</del> <ins class="diff-chg">document was created by</ins> <code><ins class="diff-chg">XMLHttpRequest</ins></code> ,<ins class="diff-chg">throw an</ins> <code><ins class= "diff-chg">INVALID_ACCESS_ERR</ins></code> <ins class= "diff-chg">exception and abort these steps.</ins> </li> <li> Apply the IDNA ToASCII algorithm to <del class="diff-old">host ,</del> <ins class="diff-chg">the new value,</ins> with both the AllowUnassigned and UseSTD3ASCIIRules flags set. Let <var title= ""><del class="diff-old">host</del> <ins class="diff-chg">new value</ins></var> be the result of the ToASCII algorithm. If ToASCII fails to convert one of the components of the string, e.g. because it is too long or because it contains invalid characters, then <del class="diff-old">fail the overall algorithm — the two URIs do not have the same scheme/host/port.</del> <ins class="diff-chg">throw a</ins> <a href= "#security9"><ins class="diff-chg">security exception</ins></a> <ins class="diff-chg">and abort these steps.</ins> <a href= "#references">[RFC3490]</a> </li> <li> If <del class="diff-old">no port is explicitly listed, then let</del> <var title=""><del class="diff-old">port</del> <ins class="diff-chg">new value</ins></var> <del class= "diff-old">be</del> <ins class="diff-chg">is not exactly equal to</ins> the <del class="diff-old">default port for</del> <ins class="diff-chg">current value of</ins> the <del class= "diff-old">protocol given by scheme . Otherwise, let</del> <code title="dom-document-domain"><a href="#domain"><ins class= "diff-chg">document.domain</ins></a></code> <ins class= "diff-chg">attribute, then run these substeps:</ins> <ol> <li> <ins class="diff-chg">If the current value is an IP address, throw a</ins> <a href="#security9"><ins class="diff-chg">security exception</ins></a> <ins class="diff-chg">and abort these steps.</ins> </li> <li> <ins class="diff-chg">If</ins> <var title=""><del class= "diff-old">port be</del> <ins class="diff-chg">new value</ins></var> ,<ins class="diff-chg">prefixed by a U+002E FULL STOP ("."), does not exactly match</ins> the <del class= "diff-old"><port> component</del> <ins class= "diff-chg">end</ins> of the <del class="diff-old">URI.</del> <ins class="diff-chg">current value, throw a</ins> <a href= "#security9"><ins class="diff-chg">security exception</ins></a> <ins class="diff-chg">and abort these steps.</ins> </li> </ol> </li> <li> <del class="diff-old">Return</del> <ins class= "diff-chg">Set</ins> the <del class="diff-old">tuple ( scheme ,</del> <ins class="diff-chg">attribute's value to</ins> <var title=""><ins class="diff-new">new value</ins></var> . </li> <li> <ins class="diff-new">Set the</ins> host <del class= "diff-old">,</del> <ins class="diff-chg">part of the</ins> <a href= "#effective3"><ins class="diff-chg">effective script origin</ins></a> <ins class="diff-chg">tuple of the</ins> <code><ins class="diff-chg">Document</ins></code> <ins class= "diff-chg">to</ins> <var title=""><ins class="diff-new">new value</ins></var> . </li> <li> <ins class="diff-new">Set the</ins> port <del class= "diff-old">).</del> <ins class="diff-chg">part of the</ins> <a href="#effective3"><ins class="diff-chg">effective script origin</ins></a> <ins class="diff-chg">tuple of the</ins> <code><ins class="diff-chg">Document</ins></code> <ins class= "diff-chg">to "manual override" (a value that, for the purposes of</ins> <a href="#same-origin" title="same origin"><ins class= "diff-chg">comparing origins</ins></a> ,<ins class="diff-chg">is identical to "manual override" but not identical to any other value).</ins> </li> </ol> <ins class="diff-new">The</ins> <dfn id="domain0" title= "the document's domain"><ins class="diff-new">domain</ins></dfn> <ins class="diff-new">of a</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">is the host part of the document's</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> ,<ins class="diff-new">if that is a scheme/host/port tuple.</ins> If <del class="diff-old">scheme 1</del> <ins class="diff-chg">it isn't, then the document does not have a domain.</ins> <ins class="diff-chg">The</ins> <code title= "dom-document-domain"><a href="#domain"><ins class= "diff-chg">domain</ins></a></code> <ins class= "diff-chg">attribute</ins> is <del class="diff-old">not case-insensitively identical</del> <ins class="diff-chg">used</ins> to <del class="diff-old">scheme 2</del> <ins class= "diff-chg">enable pages on different hosts of a domain to access each others' DOMs.</ins> <h4 id="the-string"><del class="diff-old">,</del> <ins class="diff-chg">4.3.2</ins> <ins class= "diff-chg">The string representing the script's domain in IDNA format</ins></h4> <dfn id="the-string0"><ins class="diff-chg">The string representing the script's domain in IDNA format</ins></dfn> <ins class="diff-chg">is obtained as follows: take the host part of the script's</ins> <a href="#origin0"><ins class= "diff-chg">origin</ins></a> <ins class="diff-chg">tuple and apply the IDNA ToASCII algorithm and then the IDNA ToUnicode algorithm to each component of the domain name (with both the AllowUnassigned and UseSTD3ASCIIRules flags set both times).</ins> <a href= "#references"><ins class="diff-chg">[RFC3490]</ins></a> <ins class="diff-chg">If ToASCII fails to convert one of the components of the string, e.g. because it is too long or because it contains invalid characters,</ins> or if <del class="diff-old">host 1</del> <ins class="diff-chg">the</ins> <a href= "#origin0"><ins class="diff-chg">origin</ins></a> <ins class= "diff-chg">of the script</ins> is not <del class= "diff-old">case-insensitively identical</del> <ins class= "diff-chg">a scheme/host/port tuple, then the string representing the script's domain in IDNA format cannot be obtained. (ToUnicode is defined</ins> to <del class="diff-old">host 2</del> <ins class= "diff-chg">never fail.)</ins> <h3 id="scripting"><del class="diff-old">,</del> <ins class="diff-chg">4.4</ins> <ins class= "diff-chg">Scripting</ins></h3> <ins class="diff-chg">Various mechanisms can cause author-provided executable code to run in the context of a document. These mechanisms include, but are probably not limited to:</ins> <ul> <li><ins class="diff-chg">Processing of</ins> <code><a href= "#script1"><ins class="diff-chg">script</ins></a></code> <ins class="diff-chg">elements.</ins></li> <li><ins class="diff-chg">Processing of inline</ins> <code title= "javascript protocol"><a href="#the-javascript"><ins class= "diff-chg">javascript:</ins></a></code> <ins class="diff-chg">URIs (e.g. the</ins> <code title="attr-img-src"><a href= "#src"><ins class="diff-chg">src</ins></a></code> <ins class= "diff-chg">attribute of</ins> <code><a href="#img"><ins class= "diff-chg">img</ins></a></code> <ins class= "diff-chg">elements,</ins> or <del class="diff-old">if port 1</del> <ins class="diff-chg">an</ins> <code title=""><ins class= "diff-chg">@import</ins></code> <ins class="diff-chg">rule in a CSS</ins> <code><a href="#style1"><ins class= "diff-chg">style</ins></a></code> <ins class="diff-chg">element block).</ins></li> <li><ins class="diff-chg">Event handlers, whether registered through the DOM using</ins> <code title=""><ins class= "diff-chg">addEventListener()</ins></code> ,<ins class= "diff-chg">by explicit</ins> <a href="#event3"><ins class= "diff-chg">event handler content attributes</ins></a> ,<ins class= "diff-chg">by</ins> <a href="#event4"><ins class="diff-chg">event handler DOM attributes</ins></a> ,<ins class="diff-chg">or otherwise.</ins></li> <li><ins class="diff-chg">Processing of technologies like XBL or SVG that have their own scripting features.</ins></li> </ul> <h4 id="script0"><ins class= "diff-chg">4.4.1</ins> <ins class="diff-chg">Script execution contexts</ins></h4> <ins class="diff-chg">The</ins> <dfn id="script2"><ins class= "diff-chg">script execution context</ins></dfn> <ins class= "diff-chg">of a script</ins> is <ins class="diff-new">defined when that script is created. It is typically a</ins> <code><a href= "#window"><ins class="diff-new">Window</ins></a></code> <ins class= "diff-new">object.</ins> <ins class="diff-new">A</ins> <a href="#script2"><ins class= "diff-new">script execution context</ins></a> <ins class= "diff-new">always has an associated</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> .<ins class="diff-new">If the</ins> <a href="#script2"><ins class= "diff-new">script execution context</ins></a> <ins class= "diff-new">is a</ins> <code><a href="#window"><ins class= "diff-new">Window</ins></a></code> <ins class="diff-new">object, then that object's</ins> <a href="#browsing1"><ins class= "diff-new">browsing context</ins></a> <ins class="diff-new">is it. Otherwise, the</ins> <a href="#script2"><ins class= "diff-new">script execution context</ins></a> <ins class= "diff-new">is associated explicitly with a</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">when it is created.</ins> <ins class="diff-new">It is said that</ins> <dfn id= "scripting1"><ins class="diff-new">scripting is disabled</ins></dfn> <ins class="diff-new">in a</ins> <a href= "#script2"><ins class="diff-new">script execution context</ins></a> <ins class="diff-new">when any of the following conditions are true:</ins> <ul> <li><ins class="diff-new">The user agent does</ins> not <del class= "diff-old">identical</del> <ins class="diff-chg">support scripting.</ins></li> <li><ins class="diff-chg">The user has disabled scripting for this</ins> <a href="#script2"><ins class="diff-chg">script execution context</ins></a> .<ins class="diff-chg">(User agents may provide users with the option</ins> to <del class="diff-old">port 2</del> <ins class="diff-chg">disable scripting globally, on a per-origin basis, or in other ways down to the granularity of individual</ins> <a href="#script2" title= "script execution context"><ins class="diff-chg">script execution contexts</ins></a> .)</li> <li id="designModeScriptBlocked"><ins class="diff-chg">The</ins> <a href="#script2"><ins class="diff-chg">script execution context</ins></a> <ins class="diff-chg">'s associated</ins> <a href="#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">'s</ins> <a href= "#active"><ins class="diff-chg">active document</ins></a> <ins class="diff-chg">has</ins> <code title= "dom-document-designMode"><del class="diff-old">, then fail</del> <a href="#designMode"><ins class= "diff-chg">designMode</ins></a></code> <ins class= "diff-chg">enabled.</ins></li> <li id="sandboxScriptBlocked"><ins class="diff-chg">The</ins> <a href="#script2"><ins class="diff-chg">script execution context</ins></a> <ins class="diff-chg">'s associated</ins> <a href="#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">has</ins> the <del class= "diff-old">overall algorithm —</del> <a href= "#sandboxed4"><ins class="diff-chg">sandboxed scripts browsing context flag</ins></a> <ins class="diff-chg">set.</ins></li> </ul> <ins class="diff-chg">A node is said to be</ins> <dfn id= "without"><ins class="diff-chg">without script</ins></dfn> <ins class="diff-chg">if either</ins> the <del class="diff-old">two URIs do</del> <code><ins class="diff-chg">Document</ins></code> <ins class="diff-chg">object of the node (the node itself, it is itself a</ins> <code><ins class="diff-chg">Document</ins></code> <ins class="diff-chg">object) does</ins> not have <del class= "diff-old">the same scheme/host/port.</del> <ins class= "diff-chg">an associated</ins> <a href="#browsing1"><ins class= "diff-chg">browsing context</ins></a> ,<ins class= "diff-chg">or</ins> <a href="#scripting1"><ins class= "diff-chg">scripting is disabled</ins></a> <ins class="diff-chg">in that</ins> <a href="#browsing1"><ins class="diff-chg">browsing context</ins></a> . <del class="diff-old">Otherwise,</del> <ins class="diff-chg">A node is said to be</ins> <dfn id="with-script"><ins class= "diff-chg">with script</ins></dfn> <ins class="diff-chg">if it is not</ins> <a href="#without"><ins class="diff-chg">without script</ins></a> . <ins class="diff-chg">If you can find a better pair of terms than "with script" and "without script" let me know. The only things I can find that are less confusing are also way, way longer.</ins> <ins class="diff-chg">When a script is to be executed in a</ins> <a href="#script2"><ins class="diff-chg">script execution context</ins></a> <ins class="diff-chg">in which</ins> <a href= "#scripting1"><ins class="diff-chg">scripting is disabled</ins></a> , the <del class="diff-old">two URIs</del> <ins class= "diff-chg">script must</ins> do <del class="diff-old">have</del> <ins class="diff-chg">nothing and return nothing (a void return value).</ins> <ins class="diff-chg">Thus, for instance, enabling</ins> <code title="dom-document-designMode"><a href= "#designMode"><ins class="diff-chg">designMode</ins></a></code> <ins class="diff-chg">will disable any event handler attributes, event listeners, timeouts, etc, that were set by scripts in</ins> the <del class="diff-old">same scheme/host/port.</del> <ins class= "diff-chg">document.</ins> <h4 id="security4"><del class= "diff-old">4.3.4.</del> <ins class="diff-chg">4.4.2</ins> Security exceptions</h4> Define <dfn id="security9">security exception</dfn> . <h4 id="javascript-protocol"><del class= "diff-old">4.3.5.</del> <ins class="diff-chg">4.4.3</ins> <dfn id="the-javascript" title="javascript protocol">The <code title="">javascript:</code> protocol</dfn></h4> A URI using the <code title="">javascript:</code> protocol must, if <del class="diff-old">evaluated,</del> <ins class="diff-chg">and when dereferenced,</ins> be evaluated <ins class="diff-new">by executing the script obtained</ins> using the <del class= "diff-old">in-context evaluation</del> <ins class= "diff-chg">content retrieval</ins> operation defined for <code title="">javascript:</code> URIs. <a href= "#references">[JSURI]</a> When a <a href="#browsing1">browsing context</a> is <a href= "#navigate" title="navigate">navigated</a> to a <code>javascript:</code> URI, and the <a href="#active">active document</a> of that browsing context has the <a href= "#same-origin">same origin</a> as the <ins class="diff-new">script given by that</ins> URI, the <del class= "diff-old">dereference</del> <a href="#script2"><ins class= "diff-chg">script execution</ins> context</a> must be the <code><a href="#window"><ins class= "diff-chg">Window</ins></a></code> <ins class="diff-chg">object of the</ins> <a href="#browsing1">browsing context</a> being navigated. When a browsing context is <a href="#navigate" title= "navigate">navigated</a> to a <code>javascript:</code> URI, and the <a href="#active">active document</a> of that browsing context has <del class="diff-old">a different</del> <ins class= "diff-chg">an</ins> <a href="#origin0">origin</a> <del class= "diff-old">than</del> <ins class="diff-chg">that is</ins> <ins class="diff-chg">not</ins> <ins class= "diff-chg">the</ins> <a href="#same-origin" title= "same origin"><ins class="diff-chg">same</ins></a> <ins class= "diff-chg">as that of the script given by</ins> the URI, the <del class="diff-old">dereference</del> <a href= "#script2"><ins class="diff-chg">script execution</ins> context</a> must be an empty <del class="diff-old">object.</del> <ins class= "diff-chg">object, and the</ins> <a href="#script2"><ins class= "diff-chg">script execution context</ins></a> <ins class= "diff-chg">'s associated</ins> <a href="#browsing1"><ins class= "diff-chg">browsing context</ins></a> <ins class="diff-chg">must be the</ins> <a href="#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">being</ins> <a href= "#navigate" title="navigate"><ins class= "diff-chg">navigated</ins></a> . Otherwise, the <del class="diff-old">dereference</del> <a href= "#script2"><ins class="diff-chg">script execution</ins> context</a> must <ins class="diff-new">be an empty object, and</ins> the <a href="#script2"><ins class="diff-chg">script execution context</ins></a> <ins class="diff-chg">'s associated</ins> <a href="#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">must be the</ins> <a href= "#browsing1">browsing context</a> of the <code>Document</code> <del class="diff-old">to which belongs the element for which</del> <ins class="diff-chg">object of</ins> the <del class="diff-old">URI is being dereferenced,</del> <ins class="diff-chg">element, attribute,</ins> or <del class="diff-old">to which the</del> style sheet <del class="diff-old">for</del> <ins class= "diff-chg">from</ins> which the <del class="diff-old">URI is being dereferenced applies, whichever is appropriate. URIs using the</del> <code>javascript:</code> <del class="diff-old">protocol should be evaluated when the resource for that</del> URI <del class="diff-old">is needed, unless scripting is disabled or the Document corresponding to the dereference context (as defined above), if any, has designMode enabled.</del> <ins class= "diff-chg">was reached.</ins> If the <del class="diff-old">dereference by-product</del> <ins class="diff-chg">result of executing the script</ins> is void (there is no return value), then the URI must be treated in a manner equivalent to an HTTP resource with an HTTP 204 No Content response. Otherwise, the URI must be treated in a manner equivalent to an HTTP resource with a 200 OK response whose <a href="#content-type8" title="Content-Type">Content-Type metadata</a> is <code title= "">text/html</code> and whose response body is the <del class= "diff-old">dereference by-product,</del> <ins class= "diff-chg">return value</ins> converted to a string value. Certain contexts, in particular <code><a href= "#img">img</a></code> elements, ignore the <a href="#content-type8" title="Content-Type">Content-Type metadata</a> . <div class="example"> So for example a <code title="">javascript:</code> URI for a <code title="attr-img-src"><a href="#src">src</a></code> attribute of an <code><a href="#img">img</a></code> element would be evaluated in the context of <del class="diff-old">the page</del> <ins class="diff-chg">an empty object</ins> as soon as the attribute is set; it would then be sniffed to determine the image type and decoded as an image. A <code title="">javascript:</code> URI in an <code title= "attr-a-href">href</code> attribute of an <code><a href= "#a">a</a></code> element would only be evaluated when the link was <a href="#following0" title="following hyperlinks">followed</a> . The <code title="attr-iframe-src"><a href="#src1">src</a></code> attribute of an <code><a href="#iframe">iframe</a></code> element would be evaluated in the context of the <code><a href= "#iframe">iframe</a></code> 's own <a href="#browsing1">browsing context</a> ; once evaluated, its return value (if it was not void) would replace that <a href="#browsing1">browsing context</a> 's document, thus changing the variables visible in that <a href= "#browsing1">browsing context</a> . </div> <ins class="diff-new">The rules for handling script execution in a</ins> <a href="#script2"><ins class= "diff-new">script execution context</ins></a> <ins class= "diff-new">include making the script not execute (and just return void) in certain cases, e.g. in a sandbox or when the user has disabled scripting altogether.</ins> <h4 id="events"><del class= "diff-old">4.3.6.</del> <ins class="diff-chg">4.4.4</ins> Events</h4> We need to define how to handle events that are to be fired on a Document that is no longer the active document of its browsing context, and for Documents that have no browsing context. Do the events fire? Do the handlers in that document not fire? Do we just define scripting to be disabled when the document isn't active, with events still running as is? See also the <code><a href="#script1">script</a></code> element section, which says scripts don't run when the document isn't active. <h5 id="event-handler-attributes"><del class= "diff-old">4.3.6.1.</del> <ins class= "diff-chg">4.4.4.1.</ins> Event handler attributes</h5> <a href="#html-elements">HTML elements</a> can have <dfn id= "event2">event handler attributes</dfn> specified. These act as bubbling event listeners for the element on which they are specified. Each event handler attribute has two parts, an <a href="#event3" title="event handler content attributes">event handler content attribute</a> and an <a href="#event4" title= "event handler DOM attributes">event handler DOM attribute</a> . Event handler attributes must initially be set to null. When their value changes (through the changing of their event handler content attribute or their event handler DOM attribute), they will either be null, or have an <code>EventListener</code> object assigned to them. Objects other than <code>Element</code> objects, in particular <code><a href="#window">Window</a></code> , only have <a href= "#event4" title="event handler DOM attributes">event handler DOM attribute</a> (since they have no content attributes). <dfn id="event3">Event handler content attributes</dfn> , when specified, must contain valid ECMAScript code matching the ECMAScript <code title="">FunctionBody</code> production. <a href= "#references">[ECMA262]</a> When an event handler content attribute is set, its new value must be interpreted as the body of an anonymous function with a single argument called <code>event</code> , with the new function's scope chain being linked from the activation object of the handler, to the element, to the element's <code>form</code> element if it is a form control, to the <code>Document</code> object, to the <code><a href="#window"><ins class= "diff-chg">Window</ins></a></code> <ins class="diff-chg">object of the</ins> <a href="#browsing1">browsing context</a> of that <code>Document</code> . The function's <code>this</code> parameter must be the <code>Element</code> object representing the element. The resulting function must then be set as the value of the corresponding event handler attribute, and the new value must be set as the value of the content attribute. If the given function body fails to compile, then the corresponding event handler attribute must be set to null instead (the content attribute must still be updated to the new value, though). See ECMA262 Edition 3, sections 10.1.6 and 10.2.3, for more details on activation objects. <a href= "#references">[ECMA262]</a> <ins class="diff-chg">The</ins> <a href="#script2"><ins class= "diff-chg">script execution context</ins></a> <ins class= "diff-chg">of the event handler must be the</ins> <code><a href= "#window"><ins class="diff-chg">Window</ins></a></code> <ins class= "diff-chg">object at the end of the scope chain.</ins> How do we allow non-JS event handlers? <dfn id="event4">Event handler DOM attributes</dfn> , on setting, must set the corresponding event handler attribute to their new value, and on getting, must return whatever the current value of the corresponding event handler attribute is (possibly null). The following are the event handler attributes that must be supported by all <a href="#html-elements">HTML elements</a> , as both content attributes and DOM attributes, and on <code><a href= "#window">Window</a></code> objects, as DOM attributes: <dl> <dt><dfn id="onabort" title= "handler-onabort"><code>onabort</code></dfn></dt> <dd> Must be invoked whenever an <code title="event-abort"><a href= "#abort">abort</a></code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onbeforeunload" title= "handler-onbeforeunload"><code>onbeforeunload</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-beforeunload">beforeunload</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onblur" title= "handler-onblur"><code>onblur</code></dfn></dt> <dd> Must be invoked whenever a <code title="event-blur">blur</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onchange" title= "handler-onchange"><code>onchange</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-change">change</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onclick" title= "handler-onclick"><code>onclick</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-click">click</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="oncontextmenu" title= "handler-oncontextmenu"><code>oncontextmenu</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-contextmenu">contextmenu</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="ondblclick" title= "handler-ondblclick"><code>ondblclick</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-dblclick">dblclick</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="ondrag" title= "handler-ondrag"><code>ondrag</code></dfn></dt> <dd> Must be invoked whenever a <code title="event-drag"><a href= "#drag">drag</a></code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="ondragend" title= "handler-ondragend"><code>ondragend</code></dfn></dt> <dd> Must be invoked whenever a <code title="event-dragend"><a href= "#dragend">dragend</a></code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="ondragenter" title= "handler-ondragenter"><code>ondragenter</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-dragenter"><a href="#dragenter">dragenter</a></code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="ondragleave" title= "handler-ondragleave"><code>ondragleave</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-dragleave"><a href="#dragleave">dragleave</a></code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="ondragover" title= "handler-ondragover"><code>ondragover</code></dfn></dt> <dd> Must be invoked whenever a <code title="event-dragover"><a href= "#dragover">dragover</a></code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="ondragstart" title= "handler-ondragstart"><code>ondragstart</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-dragstart"><a href="#dragstart">dragstart</a></code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="ondrop" title= "handler-ondrop"><code>ondrop</code></dfn></dt> <dd> Must be invoked whenever a <code title="event-drop"><a href= "#drop">drop</a></code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onerror" title= "handler-onerror"><code>onerror</code></dfn></dt> <dd> Must be invoked whenever an <code title="event-error"><a href= "#error1">error</a></code> event is targeted at or bubbles through the element. The <code title="handler-onerror"><a href= "#onerror">onerror</a></code> handler is also used for <a href= "#runtime-script-errors">reporting script errors</a> . </dd> <dt><dfn id="onfocus" title= "handler-onfocus"><code>onfocus</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-focus">focus</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onkeydown" title= "handler-onkeydown"><code>onkeydown</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-keydown">keydown</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onkeypress" title= "handler-onkeypress"><code>onkeypress</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-keypress">keypress</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onkeyup" title= "handler-onkeyup"><code>onkeyup</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-keyup">keyup</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onload" title= "handler-onload"><code>onload</code></dfn></dt> <dd> Must be invoked whenever a <code title="event-load"><a href= "#load0">load</a></code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onmessage" title= "handler-onmessage"><code>onmessage</code></dfn></dt> <dd> Must be invoked whenever a <code title="event-message"><a href= "#message0">message</a></code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onmousedown" title= "handler-onmousedown"><code>onmousedown</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-mousedown">mousedown</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onmousemove" title= "handler-onmousemove"><code>onmousemove</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-mousemove">mousemove</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onmouseout" title= "handler-onmouseout"><code>onmouseout</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-mouseout">mouseout</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onmouseover" title= "handler-onmouseover"><code>onmouseover</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-mouseover">mouseover</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onmouseup" title= "handler-onmouseup"><code>onmouseup</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-mouseup">mouseup</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onmousewheel" title= "handler-onmousewheel"><code>onmousewheel</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-mousewheel">mousewheel</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onresize" title= "handler-onresize"><code>onresize</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-resize">resize</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onscroll" title= "handler-onscroll"><code>onscroll</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-scroll">scroll</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onselect" title= "handler-onselect"><code>onselect</code></dfn></dt> <dd> Must be invoked whenever a <code title="event-select"><a href= "#select">select</a></code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onstorage" title="handler-onstorage"><code><ins class= "diff-new">onstorage</ins></code></dfn></dt> <dd> <ins class="diff-new">Must be invoked whenever a</ins> <code title="event-storage"><a href="#storage1"><ins class= "diff-new">storage</ins></a></code> <ins class="diff-new">event is targeted at or bubbles through the element.</ins> </dd> <dt><dfn id="onsubmit" title= "handler-onsubmit"><code>onsubmit</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-submit">submit</code> event is targeted at or bubbles through the element. </dd> <dt><dfn id="onunload" title= "handler-onunload"><code>onunload</code></dfn></dt> <dd> Must be invoked whenever an <code title= "event-unload">unload</code> event is targeted at or bubbles through the element. </dd> </dl> When an event handler attribute is invoked, its argument must be set to the <code>Event</code> object of the event in question. If the function returns the exact boolean value false, the event's <code>preventDefault()</code> method must then invoked. Exception: for historical reasons, for the HTML <code>mouseover</code> event, the <code>preventDefault()</code> method must be called when the function returns true instead. <del class="diff-old">When scripting is disabled , event handler attributes must do nothing. When scripting is enabled , all</del> <ins class="diff-chg">All</ins> event handler attributes on an element, whether set to null or to a function, must be registered as event listeners on the element, as if the <code title= "dom-EventTarget-addEventListenerNS">addEventListenerNS()</code> method on the <code>Element</code> object's <code>EventTarget</code> interface had been invoked when the element was created, with the event type ( <var title= "dom-event-type">type</var> argument) equal to the type described for the event handler attribute in the list above, the namespace ( <var title="dom-event-namespaceURI">namespaceURI</var> argument) set to null, the listener set to be a target and bubbling phase listener ( <var title="dom-event-useCapture">useCapture</var> argument set to false), the event group set to the default group ( <var title="dom-event-evtGroup">evtGroup</var> argument set to null), and the event listener itself ( <var title= "dom-event-listener">listener</var> argument) set to do nothing while the event handler attribute is null, and set to invoke the function associated with the event handler attribute otherwise. <ins class="diff-new">(The</ins> <var title= "dom-event-listener"><ins class="diff-new">listener</ins></var> <ins class="diff-new">argument is emphatically</ins> <ins class="diff-new">not</ins> <ins class="diff-new">the event handler attribute itself.)</ins> <h5 id="event"><del class= "diff-old">4.3.6.2.</del> <ins class= "diff-chg">4.4.4.2.</ins> Event firing</h5> maybe this should be moved higher up (terminology? conformance? DOM?) Also, the whole terminology thing should be changed so that we don't define any specific events here, we only define 'simple event', 'progress event', 'mouse event', 'key event', and the like, and have the actual dispatch use those generic terms when firing events. Certain operations and methods are defined as firing events on elements. For example, the <code title="dom-click"><a href= "#click">click()</a></code> method on the <code><a href= "#htmlelement">HTMLElement</a></code> interface is defined as firing a <code title="event-click">click</code> event on the element. <a href="#references">[DOM3EVENTS]</a> <dfn id="firing" title="fire a click event">Firing a <code title="event-click">click</code> event</dfn> means that a <a href= "http://www.w3.org/TR/DOM-Level-3-Events/events.html#event-click"><code> click</code></a> event with no namespace, which bubbles and is cancelable, and which uses the <code>MouseEvent</code> interface, must be dispatched at the given element. The event object must have its <code title="">screenX</code> , <code title="">screenY</code> , <code title="">clientX</code> , <code title="">clientY</code> , and <code title="">button</code> attributes set to 0, its <code title= "">ctrlKey</code> , <code title="">shiftKey</code> , <code title= "">altKey</code> , and <code title="">metaKey</code> attributes set according to the current state of the key input device, if any (false for any keys that are not available), its <code title= "">detail</code> attribute set to 1, and its <code title= "">relatedTarget</code> attribute set to null. The <code title= "">getModifierState()</code> method on the object must return values appropriately describing the state of the key input device at the time the event is created. <dfn id="firing0" title="fire a change event">Firing a <code title="event-change">change</code> event</dfn> means that a <a href= "http://www.w3.org/TR/DOM-Level-3-Events/events.html#event-change"><code> change</code></a> event with no namespace, which bubbles but is not cancelable, and which uses the <code>Event</code> interface, must be dispatched at the given element. The event object must have its <code title="">detail</code> attribute set to 0. <dfn id="firing1" title="fire a contextmenu event">Firing a <code title="event-contextmenu">contextmenu</code> event</dfn> means that a <code title="event-contextmenu">contextmenu</code> event with no namespace, which bubbles and is cancelable, and which uses the <code>Event</code> interface, must be dispatched at the given element. The event object must have its <code title= "">detail</code> attribute set to 0. <dfn id="firing2" title="fire a simple event">Firing a simple event called <var title="">e</var></dfn> means that an event with the name <var title="">e</var> , with no namespace, which does not bubble but is <del class="diff-old">cancelable,</del> <ins class= "diff-chg">cancelable (unless otherwise stated),</ins> and which uses the <code>Event</code> interface, must be dispatched at the given element. <dfn id="firing3" title="fire a show event">Firing a <code title="event-show">show</code> event</dfn> means <a href= "#firing2" title="fire a simple event">firing a simple event called <code title="event-show">show</code></a> . Actually this should fire an event that has modifier information (shift/ctrl <del class="diff-old">etc).</del> <ins class="diff-chg">etc), as well as having a pointer to the node on which the menu was fired, and with which the menu was associated (which could be an ancestor of the former).</ins> <dfn id="firing4" title="fire a load event">Firing a <code title="event-load">load</code> event</dfn> means <a href= "#firing2" title="fire a simple event">firing a simple event called <code title="event-load">load</code></a> . <dfn id="firing5" title= "fire an error event">Firing an <code title= "event-error">error</code> event</dfn> means <a href="#firing2" title="fire a simple event">firing a simple event called <code title="event-error">error</code></a> . <dfn id="firing6" title= "fire a progress event">Firing a progress event called <var title= "">e</var></dfn> means something that hasn't yet been defined, in the <a href="#references">[PROGRESS]</a> spec. The default action of these event is to do nothing unless otherwise stated. If you dispatch a custom "click" event at an element that would normally have default actions, should they get triggered? If so, we need to go through the entire spec and make sure that any default actions are defined in terms of any event of the right type on that element, not those that are dispatched in expected ways. <h5 id="events0"><del class= "diff-old">4.3.6.3.</del> <ins class= "diff-chg">4.4.4.3.</ins> Events and the <code><a href= "#window">Window</a></code> object</h5> When an event is dispatched at a DOM node in a <code>Document</code> in a <a href="#browsing1">browsing context</a> , if the event is not a <code title= "event-load"><a href="#load0">load</a></code> event, the user agent must also dispatch the event to the <code><a href= "#window">Window</a></code> , as follows: <ol> <li>In the capture phase, the event must be dispatched to the <code><a href="#window">Window</a></code> object before being dispatched to any of the nodes.</li> <li>In the bubble phase, the event must be dispatched to the <code><a href="#window">Window</a></code> object at the end of the phase, unless bubbling has been prevented.</li> </ol> <h5 id="runtime-script-errors"><del class= "diff-old">4.3.6.4.</del> <ins class= "diff-chg">4.4.4.4.</ins> Runtime script errors</h5> This section only applies to user agents that support scripting in general and ECMAScript in particular. Whenever a runtime script error occurs in one of the scripts associated with the document, the value of the <code title= "handler-onerror"><a href="#onerror">onerror</a></code> event handler DOM attribute of the <code><a href= "#window">Window</a></code> object must be processed, as follows: <dl class="switch"> <dt>If the value is a function</dt> <dd> The function referenced by the <code title= "handler-onerror"><a href="#onerror">onerror</a></code> attribute must be invoked with three arguments, before notifying the user of the error. The three arguments passed to the function are all <code>DOMString</code> s; the first must give the message that the UA is considering reporting, the second must give the URI to the resource in which the error <del class="diff-old">occured,</del> <ins class="diff-chg">occurred,</ins> and the third must give the line number in that resource on which the error <del class= "diff-old">occured.</del> <ins class="diff-chg">occurred.</ins> If the function returns false, then the error should not be reported to the user. Otherwise, if the function returns another value (or does not return at all), the error should be reported to the user. Any exceptions thrown or errors caused by this function must be reported to the user immediately after the error that the function was called for, without calling the function again. </dd> <dt>If the value is <code>null</code></dt> <dd> The error should not reported to the user. </dd> <dt>If the value is anything else</dt> <dd> The error should be reported to the user. </dd> </dl> The initial value of <code title="handler-onerror"><a href= "#onerror">onerror</a></code> must be <code>undefined</code> . <h3 id="user-prompts"><del class= "diff-old">4.4.</del> <ins class="diff-chg">4.5</ins> User prompts</h3> <h4 id="simple0"><ins class= "diff-new">4.5.1</ins> <ins class="diff-new">Simple dialogs</ins></h4> The <dfn id="alert" title="dom-alert"><code>alert( <var title= "">message</var> )</code></dfn> method, when invoked, must show the given <var title="">message</var> to the user. The user agent may make the method wait for the user to acknowledge the message before returning; if so, the user agent must <a href="#pause">pause</a> while the method is waiting. The <dfn id="confirm" title="dom-confirm"><code>confirm( <var title="">message</var> )</code></dfn> method, when invoked, must show the given <var title="">message</var> to the user, and ask the user to respond with a positive or negative response. The user agent must then <a href="#pause">pause</a> as the <del class= "diff-old">the</del> method waits for the user's response. If the user responds positively, the method must return true, and if the user responds negatively, the method must return false. The <dfn id="prompt" title="dom-prompt"><code>prompt( <var title="">message</var> , <var title="">default</var> )</code></dfn> method, when invoked, must show the given <var title="">message</var> to the user, and ask the user to either respond with a string value or abort. The user agent must then <a href="#pause">pause</a> as the <del class="diff-old">the</del> method waits for the user's response. The second argument is optional. If the second argument ( <var title="">default</var> ) is present, then the response must be defaulted to the value given by <var title="">default</var> . If the user aborts, then the method must return null; otherwise, the method must return the string that the user responded with. <h4 id="printing"><ins class= "diff-new">4.5.2</ins> <ins class= "diff-new">Printing</ins></h4> The <dfn id="print" title="dom-print"><code>print()</code></dfn> method, when invoked, <ins class="diff-new">must run the</ins> <a href="#printing0"><ins class="diff-new">printing steps</ins></a> . <ins class="diff-new">User agents should also run the</ins> <a href="#printing0"><ins class="diff-new">printing steps</ins></a> <ins class="diff-new">whenever the user attempts to obtain a physical form (e.g. printed copy), or the representation of a physical form (e.g. PDF copy), of a document.</ins> <ins class="diff-new">The</ins> <dfn id="printing0"><ins class= "diff-new">printing steps</ins></dfn> <ins class="diff-new">are as follows:</ins> <ol> <li> <ins class="diff-new">The user agent may display a message to the user and/or may abort these steps.</ins> <ins class="diff-new">For instance, a kiosk browser could silently ignore any invocations of the</ins> <code title="dom-print"><a href="#print"><ins class= "diff-new">print()</ins></a></code> <ins class= "diff-new">method.</ins> <ins class="diff-new">For instance, a browser on a mobile device could detect that there are no printers in the vicinity and display a message saying so before continuing to offer a "save to PDF" option.</ins> </li> <li> <ins class="diff-new">The user agent must</ins> <a href= "#firing2"><ins class="diff-new">fire a simple event</ins></a> <ins class="diff-new">called</ins> <code title= "event-beforeprint"><ins class="diff-new">beforeprint</ins></code> <ins class="diff-new">at the</ins> <code><a href= "#window"><ins class="diff-new">Window</ins></a></code> <ins class= "diff-new">object of the browsing context of the</ins> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">that is being printed, as well as any</ins> <a href= "#nested0" title="nested browsing context"><ins class= "diff-new">nested browsing contexts</ins></a> <ins class= "diff-new">in it.</ins> <ins class="diff-new">The</ins> <code title= "event-beforeprint"><ins class="diff-new">beforeprint</ins></code> <ins class="diff-new">event can be used to annotate the printed copy, for instance adding the time at which the document was printed.</ins> </li> <li> <ins class="diff-new">The user agent</ins> should offer the user the opportunity to <a href="#obtain">obtain a physical form</a> <ins class="diff-new">(or the representation of a physical form)</ins> of the document. The user agent may <del class= "diff-old">make the method</del> wait for the user to either accept or decline before returning; if so, the user agent must <a href= "#pause">pause</a> while the method is waiting. <del class= "diff-old">(This</del> <ins class="diff-chg">Even if the user agent doesn't wait at this point, the user agent must use the state of the relevant documents as they are at this point in the algorithm if and when it eventually creates the alternate form.</ins> </li> <li> <ins class="diff-chg">The user agent must</ins> <a href= "#firing2"><ins class="diff-chg">fire a simple event</ins></a> <ins class="diff-chg">called</ins> <code title= "event-afterprint"><ins class="diff-chg">afterprint</ins></code> <ins class="diff-chg">at the</ins> <code><a href= "#window"><ins class="diff-chg">Window</ins></a></code> <ins class= "diff-chg">object of the browsing context of the</ins> <code><ins class="diff-chg">Document</ins></code> <ins class= "diff-chg">that is being printed, as well as any</ins> <a href= "#nested0" title="nested browsing context"><ins class= "diff-chg">nested browsing contexts</ins></a> <ins class= "diff-chg">in it.</ins> <ins class="diff-chg">The</ins> <code title= "event-afterprint"><ins class="diff-chg">afterprint</ins></code> <ins class="diff-chg">event can be used to revert annotations added in the earlier event, as well as showing post-printing UI. For instance, if a page is walking the user through the steps of applying for a home loan, the script could automatically advance to the next step after having printed a form or other.</ins> </li> </ol> <h4 id="dialogs"><ins class= "diff-chg">4.5.3</ins> <ins class="diff-chg">Dialogs implemented using separate documents</ins></h4> <ins class="diff-chg">The</ins> <dfn id="showmodaldialog" title= "dom-showModalDialog"><code><ins class= "diff-chg">showModalDialog(</ins> <var title=""><ins class= "diff-chg">url</ins></var> ,<var title=""><ins class= "diff-chg">arguments</ins></var> <ins class= "diff-chg">)</ins></code></dfn> <ins class="diff-chg">method, when invoked, must cause the user agent to run the following steps:</ins> <ol> <li> <ins class="diff-chg">If the user agent is configured such that this invocation of</ins> <code title="dom-showModalDialog"><a href= "#showmodaldialog"><ins class= "diff-chg">showModalDialog()</ins></a></code> <ins class= "diff-chg">is somehow disabled, then the method returns the empty string; abort these steps.</ins> <ins class="diff-chg">User agents are expected to disable this method in certain cases to avoid user annoyance. For instance, a user agent could require that a site be white-listed before enabling this method, or the user agent could be configured to only allow one modal dialog at a time.</ins> </li> <li> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">the list of background browsing contexts</ins></var> <ins class="diff-chg">be a list of all the browsing contexts that:</ins> <ul> <li><ins class="diff-chg">are part of the same</ins> <a href= "#unit-of"><ins class="diff-chg">unit of related browsing contexts</ins></a> <ins class="diff-chg">as the browsing context of the</ins> <code><a href="#window"><ins class= "diff-chg">Window</ins></a></code> <ins class="diff-chg">object on which the</ins> <code title="dom-showModalDialog"><a href= "#showmodaldialog"><ins class= "diff-chg">showModalDialog()</ins></a></code> <ins class= "diff-chg">method was called, and that</ins></li> <li><ins class="diff-chg">have an</ins> <a href= "#active"><ins class="diff-chg">active document</ins></a> <ins class="diff-chg">whose</ins> <a href="#origin0"><ins class= "diff-chg">origin</ins></a> <ins class="diff-chg">is the</ins> <a href="#same-origin" title="same origin"><ins class= "diff-chg">same</ins></a> <ins class="diff-chg">as the</ins> <a href="#origin0"><ins class="diff-chg">origin</ins></a> <ins class="diff-chg">of the script that called the</ins> <code title="dom-showModalDialog"><a href= "#showmodaldialog"><ins class= "diff-chg">showModalDialog()</ins></a></code> <ins class= "diff-chg">method at the time the method was called,</ins></li> </ul> ...as<ins class="diff-chg">well as any browsing contexts that are nested inside any of the browsing contexts matching those conditions.</ins> </li> <li> <ins class="diff-chg">Disable the user interface for all the browsing contexts in</ins> <var title=""><ins class="diff-chg">the list of background browsing contexts</ins></var> .<ins class= "diff-chg">This should prevent the user from navigating those browsing contexts, causing events to to be sent to those browsing context, or editing any content in those browsing contexts. However, it</ins> does <del class="diff-old">not,</del> <ins class= "diff-chg">not prevent those browsing contexts from receiving events from sources other than the user, from running scripts, from running animations, and so forth.</ins> </li> <li> <ins class="diff-chg">Create a new</ins> <a href= "#auxiliary0"><ins class="diff-chg">auxiliary browsing context</ins></a> ,<ins class="diff-chg">with the</ins> <a href= "#opener"><ins class="diff-chg">opener browsing context</ins></a> <ins class="diff-chg">being the browsing context</ins> of <del class="diff-old">course, preclude</del> the <code><a href= "#window"><ins class="diff-new">Window</ins></a></code> <ins class= "diff-new">object on which the</ins> <code title= "dom-showModalDialog"><a href="#showmodaldialog"><ins class= "diff-new">showModalDialog()</ins></a></code> <ins class= "diff-new">method was called. The new auxiliary browsing context has no name.</ins> <ins class="diff-new">This browsing context implements the</ins> <code><a href="#modalwindow"><ins class= "diff-new">ModalWindow</ins></a></code> <ins class= "diff-new">interface.</ins> </li> <li> <ins class="diff-new">Let the</ins> <a href= "#dialog0"><ins class="diff-new">dialog arguments</ins></a> <ins class="diff-new">of the new browsing context be set to the value of</ins> <var title=""><ins class= "diff-new">arguments</ins></var> . </li> <li> <ins class="diff-new">Let the</ins> <a href= "#dialog1"><ins class="diff-new">dialog arguments' origin</ins></a> <ins class="diff-new">be the</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">of the script that called the</ins> <code title="dom-showModalDialog"><a href= "#showmodaldialog"><ins class= "diff-new">showModalDialog()</ins></a></code> <ins class= "diff-new">method.</ins> </li> <li> <a href="#navigate"><ins class="diff-new">Navigate</ins></a> <ins class="diff-new">the new browsing context to</ins> <var title= ""><ins class="diff-new">url</ins></var> ,<ins class= "diff-new">with</ins> <a href="#replacement"><ins class= "diff-new">replacement enabled</ins></a> ,<ins class="diff-new">and with the</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">of the</ins> <code><a href= "#window"><ins class="diff-new">Window</ins></a></code> <ins class= "diff-new">object that is the</ins> <a href="#script2"><ins class= "diff-new">script execution context</ins></a> <ins class= "diff-new">of the script that invoked the method as the</ins> <a href="#source0"><ins class="diff-new">source browsing context</ins></a> . <ins class="diff-new">If the</ins> <a href= "#script2"><ins class="diff-new">script execution context</ins></a> <ins class="diff-new">of a script isn't a</ins> <code><a href= "#window"><ins class="diff-new">Window</ins></a></code> <ins class= "diff-new">object, then it can't ever get to a</ins> <code><a href= "#window"><ins class="diff-new">Window</ins></a></code> <ins class= "diff-new">object to call this method.</ins> </li> <li> <ins class="diff-new">Wait for the browsing context to be closed. (The</ins> user agent <ins class="diff-new">must allow the user to indicate that the browsing context is to be closed.)</ins> </li> <li> <ins class="diff-new">Reenable the user interface for all the browsing contexts in</ins> <var title=""><ins class="diff-new">the list of background browsing contexts</ins></var> . </li> <li> <ins class="diff-new">Return the</ins> <a href= "#auxiliary0"><ins class="diff-new">auxiliary browsing context</ins></a> <ins class="diff-new">'s</ins> <a href= "#return"><ins class="diff-new">return value</ins></a> . </li> </ol> <ins class="diff-new">Browsing contexts created by the above algorithm must implement the</ins> <code><a href= "#modalwindow"><ins class="diff-new">ModalWindow</ins></a></code> <ins class="diff-new">interface:</ins> <pre class="idl"> [XXX] interface <dfn id= "modalwindow">ModalWindow</dfn> {<ins class="diff-new"> readonly attribute any <a href="#dialogarguments" title= "dom-modalWindow-dialogArguments">dialogArguments</a>; attribute DOMString <a href="#returnvalue" title= "dom-modalWindow-returnValue">returnValue</a>; }; </ins> </pre> <ins class="diff-new">Such browsing contexts have associated</ins> <dfn id="dialog0"><ins class="diff-new">dialog arguments</ins></dfn> ,<ins class="diff-new">which are stored along with the</ins> <dfn id="dialog1"><ins class="diff-new">dialog arguments' origin</ins></dfn> .<ins class="diff-new">These values are set by the</ins> <code title="dom-showModalDialog"><a href= "#showmodaldialog"><ins class= "diff-new">showModalDialog()</ins></a></code> <ins class= "diff-new">method in the algorithm above, when the browsing context is created, based on the arguments provided to the method.</ins> <ins class="diff-new">The</ins> <dfn id="dialogarguments" title= "dom-modalWindow-dialogArguments"><code><ins class= "diff-new">dialogArguments</ins></code></dfn> <ins class= "diff-new">DOM attribute, on getting, must check whether its browsing context's</ins> <a href="#active"><ins class= "diff-new">active document</ins></a> <ins class="diff-new">'s</ins> <a href="#origin0"><ins class="diff-new">origin</ins></a> <ins class="diff-new">is the</ins> <a href="#same-origin" title= "same origin"><ins class="diff-new">same</ins></a> <ins class= "diff-new">as the</ins> <a href="#dialog1"><ins class= "diff-new">dialog arguments' origin</ins></a> .<ins class= "diff-new">If it is, then the browsing context's</ins> <a href= "#dialog0"><ins class="diff-new">dialog arguments</ins></a> <ins class="diff-new">must be returned unchanged. Otherwise, if the</ins> <a href="#dialog0"><ins class="diff-new">dialog arguments</ins></a> <ins class="diff-new">are an object, then the empty string must be returned, and if the</ins> <a href= "#dialog0"><ins class="diff-new">dialog arguments</ins></a> <ins class="diff-new">are not an object, then the stringification of the</ins> <a href="#dialog0"><ins class="diff-new">dialog arguments</ins></a> <ins class="diff-new">must be returned.</ins> <ins class="diff-new">These browsing contexts also have an associated</ins> <dfn id="return"><ins class="diff-new">return value</ins></dfn> .<ins class="diff-new">The</ins> <a href= "#return"><ins class="diff-new">return value</ins></a> <ins class= "diff-new">of a browsing context must be initialized to the empty string when the browsing context is created.</ins> <ins class="diff-new">The</ins> <dfn id="returnvalue" title= "dom-modalWindow-returnValue"><code><ins class= "diff-new">returnValue</ins></code></dfn> <ins class="diff-new">DOM attribute, on getting, must return the</ins> <a href= "#return"><ins class="diff-new">return value</ins></a> <ins class= "diff-new">of its browsing context, and on setting, must set the</ins> <a href="#return"><ins class="diff-new">return value</ins></a> <ins class="diff-new">to the given new value.</ins> <h4 id="notifications"><ins class= "diff-new">4.5.4</ins> <ins class= "diff-new">Notifications</ins></h4> <ins class="diff-new">Notifications are short, transient messages that bring the user's attention to new information, or remind the user of scheduled events.</ins> <ins class="diff-new">Since notifications can be annoying if abused, this specification defines a mechanism that scopes notifications to a site's existing rendering area unless the user explicitly indicates that the site can be trusted.</ins> <ins class="diff-new">To this end, each</ins> <a href= "#origin0"><ins class="diff-new">origin</ins></a> <ins class= "diff-new">can be flagged as being a</ins> <dfn id= "trusted"><ins class="diff-new">trusted notification source</ins></dfn> .<ins class="diff-new">By default origins should not be flagged as such, but user agents may allow users to whitelist origins or groups of origins as being</ins> <a href= "#trusted" title="trusted notification source"><ins class= "diff-new">trusted notification sources</ins></a> .<ins class= "diff-new">Only origins flagged as trusted in this way are allowed to show notification UI outside of their tab.</ins> <ins class="diff-new">For example, a user agent could allow a user to mark all subdomains and ports of example.org as trusted notification sources. Then, mail.example.org and calendar.example.org would both be able to show notifications, without the user having to flag them individually.</ins> <ins class="diff-new">The</ins> <dfn id="shownotification" title="dom-showNotification"><code><ins class= "diff-new">showNotification(</ins> <var title=""><ins class= "diff-new">title</ins></var> ,<var title=""><ins class= "diff-new">subtitle</ins></var> ,<var title=""><ins class= "diff-new">description</ins></var> ,<var title=""><ins class= "diff-new">onclick</ins></var> <ins class= "diff-new">)</ins></code></dfn> <ins class="diff-new">method, when invoked, must cause the user agent to show a notification.</ins> <ins class="diff-new">If the method was invoked</ins> from <ins class="diff-new">a script whose</ins> <a href="#script2"><ins class="diff-new">script execution context</ins></a> <ins class="diff-new">'s associated</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">has the</ins> <a href= "#sandboxed1"><ins class="diff-new">sandboxed annoyances browsing context flag</ins></a> <ins class="diff-new">set, then the notification must be shown within that</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> .<ins class="diff-new">The notification is said to be a</ins> <dfn id="sandboxed5"><ins class="diff-new">sandboxed notification</ins></dfn> . <ins class="diff-new">Otherwise, if the</ins> <a href= "#origin0"><ins class="diff-new">origin</ins></a> <ins class= "diff-new">of the</ins> <a href="#browsing1"><ins class= "diff-new">browsing context</ins></a> <ins class= "diff-new">associated with the</ins> <a href="#script2"><ins class= "diff-new">script execution context</ins></a> <ins class= "diff-new">of the script that invoked the method is</ins> <del class="diff-old">always</del> <ins class= "diff-chg">not</ins> <del class="diff-old">offering</del> <ins class="diff-chg">flagged as being a</ins> <a href= "#trusted"><ins class="diff-chg">trusted notification source</ins></a> ,<ins class="diff-chg">then the notification should be rendered within the</ins> <a href= "#top-level"><ins class="diff-chg">top-level browsing context</ins></a> <ins class="diff-chg">of the</ins> <a href= "#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">associated with the</ins> <a href= "#script2"><ins class="diff-chg">script execution context</ins></a> <ins class="diff-chg">of the script that invoked the method. The notification is said to be a</ins> <dfn id="normal"><ins class= "diff-chg">normal notification</ins></dfn> .<ins class= "diff-chg">User agents should provide a way to set the origin's</ins> <a href="#trusted"><ins class="diff-chg">trusted notification source</ins></a> <ins class="diff-chg">flag from the notification, so that the user can benefit from notifications even when the user agent is not the active application.</ins> <ins class="diff-chg">Otherwise, the</ins> <a href= "#origin0"><ins class="diff-chg">origin</ins></a> <ins class= "diff-chg">is flagged as a</ins> <a href="#trusted"><ins class= "diff-chg">trusted notification source</ins></a> ,<ins class= "diff-chg">and the notification should be shown using the platform conventions for system-wide notifications. The notification is said to be a</ins> <dfn id="trusted0"><ins class="diff-chg">trusted notification</ins></dfn> .<ins class="diff-chg">User agents may provide a way to unset the origin's</ins> <a href= "#trusted"><ins class="diff-chg">trusted notification source</ins></a> <ins class="diff-chg">flag from within the notification, so as to allow users to easily disable notifications from sites that abuse the privilege.</ins> <div class="example"> <ins class="diff-chg">For example, if a site contains a gadget of a mail application in a sandboxed</ins> <code><a href= "#iframe"><ins class="diff-chg">iframe</ins></a></code> <ins class= "diff-chg">and that frame triggers a notification upon the receipt of a new e-mail message, that notification would be displayed on top of the gadget only.</ins> <ins class="diff-chg">However, if the user then goes to the main site of that mail application, the notification would be displayed over the entire rendering area of the tab for the site.</ins> <ins class="diff-chg">The notification, in this case, would have a button on it to let the user indicate that he trusts the site. If the user clicked this button, the next notification would use the system-wide notification system, appearing even if the tab for the mail application was buried deep inside a minimised window.</ins> </div> <div class="example"> <ins class="diff-chg">The style of notifications varies from platform to platform. On some, it is typically displayed as a "toast" window that slides in from the bottom right corner. In others, notifications are shown as semi-transparent white-on-grey overlays centered over the screen. Other schemes could include simulated ticker tapes, and speech-synthesis playback.</ins> </div> <ins class="diff-chg">When a</ins> <a href="#normal"><ins class= "diff-chg">normal notification</ins></a> <ins class="diff-chg">(but not a</ins> <a href="#sandboxed5"><ins class="diff-chg">sandboxed notification</ins></a> <ins class="diff-chg">) is shown,</ins> the user <ins class="diff-new">agent may bring the user's attention to the</ins> <a href="#top-level"><ins class="diff-new">top-level browsing context</ins></a> <ins class="diff-new">of the</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">associated</ins> with the <del class="diff-old">opportunity</del> <a href= "#script2"><ins class="diff-chg">script execution context</ins></a> <ins class="diff-chg">of the script that invoked the method, if that would be useful; but user agents should not use system-wide notification mechanisms</ins> to <del class= "diff-old">convert</del> <ins class="diff-chg">do so.</ins> <ins class="diff-chg">When a</ins> <a href= "#trusted0"><ins class="diff-chg">trusted notification</ins></a> <ins class="diff-chg">is shown, the user agent should bring</ins> the <ins class="diff-new">user's attention to the notification and the</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">associated with the</ins> <a href="#script2"><ins class="diff-new">script execution context</ins></a> <ins class="diff-new">of the script that invoked the method, as per the platform conventions for attracting the user's attention to applications.</ins> <div class="example"> <ins class="diff-new">In the case of</ins> <a href="#normal" title="normal notification"><ins class="diff-new">normal notifications</ins></a> ,<ins class="diff-new">typically the only attention-grabbing device that would be employed would be something like flashing the tab's caption, or making it bold, or some such.</ins> <ins class="diff-new">In addition, in the case of a</ins> <a href="#trusted0"><ins class="diff-new">trusted notification</ins></a> ,<ins class="diff-new">the entire window could flash, or the browser's application icon could bounce or flash briefly, or a short sound effect could be played.</ins> </div> <ins class="diff-new">Notifications should include the following content:</ins> <ul> <li><ins class="diff-new">The</ins> <var title=""><ins class= "diff-new">title</ins></var> ,<var title=""><ins class= "diff-new">subtitle</ins></var> ,<ins class="diff-new">and</ins> <var title=""><ins class="diff-new">description</ins></var> <ins class="diff-new">strings passed to the method. They may be truncated or abbreviated if necessary.</ins></li> <li><ins class="diff-new">The</ins> <a href="#application-name" title="meta-application-name"><ins class="diff-new">application name</ins></a> ,<ins class="diff-new">if available, or else the</ins> <a href="#document.title" title= "dom-document-title"><ins class="diff-new">document title</ins></a> ,<ins class="diff-new">of the</ins> <a href="#active"><ins class= "diff-new">active</ins> document</a> <ins class="diff-new">of the</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">associated with the</ins> <a href="#script2"><ins class="diff-new">script execution context</ins></a> <ins class="diff-new">of the script that invoked the method.</ins></li> <li><ins class="diff-new">An icon chosen from the</ins> <a href= "#links1" title="external resource link"><ins class= "diff-new">external resource links</ins></a> <ins class= "diff-new">of type</ins> <code title="rel-icon"><a href= "#icon3"><ins class="diff-new">icon</ins></a></code> ,<ins class= "diff-new">if any are available.</ins></li> </ul> <ins class="diff-new">If a new notification from one</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">has</ins> <var title= ""><ins class="diff-new">title</ins></var> ,<var title= ""><ins class="diff-new">subtitle</ins></var> ,<ins class= "diff-new">and</ins> <var title=""><ins class= "diff-new">description</ins></var> <ins class="diff-new">strings that are identical</ins> to <del class="diff-old">whatever media</del> <ins class="diff-chg">the</ins> <var title= ""><ins class="diff-chg">title</ins></var> ,<var title= ""><ins class="diff-chg">subtitle</ins></var> ,<ins class= "diff-chg">and</ins> <var title=""><ins class= "diff-chg">description</ins></var> <ins class="diff-chg">strings of an already-active notification from the same</ins> <a href= "#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">or another</ins> <a href="#browsing1" title= "browsing context"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">with the same</ins> <a href= "#origin0"><ins class="diff-chg">origin</ins></a> , the user <del class="diff-old">might want.)</del> <ins class= "diff-chg">agent should not display the new notification, but should instead add an indicator to the already-active notification that another identical notification would otherwise have been shown.</ins> <div class="example"> <ins class="diff-chg">For instance, if a user has his mail application open in three windows, and thus the same "New Mail" notification is fired three times each time a mail is received, instead of displaying three identical notifications each time, the user agent could just show one, with the title "New Mail x3".</ins> </div> <ins class="diff-chg">Notifications should have a lifetime based on the platform conventions for notifications. However, the lifetime of a notification should not begin until the user has had the opportunity to see it, so if a notification is spawned for a</ins> <a href="#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">that is hidden, it should be shown for its complete lifetime once the user brings that</ins> <a href="#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">into view.</ins> <ins class="diff-chg">User agents should support multiple notifications at once.</ins> <ins class="diff-chg">User agents should support user interaction with notifications, if and as appropriate given the platform conventions. If a user activates a notification, and the</ins> <var title=""><ins class="diff-chg">onclick</ins></var> <ins class="diff-chg">callback argument was present and is not null, then the</ins> <a href="#browsing1"><ins class= "diff-chg">browsing context</ins></a> <ins class= "diff-chg">associated with the</ins> <a href="#script2"><ins class= "diff-chg">script execution context</ins></a> <ins class= "diff-chg">of the function given by</ins> <var title=""><ins class= "diff-chg">onclick</ins></var> <ins class="diff-chg">should be brought to the user's attention, and the</ins> <var title= ""><ins class="diff-chg">onclick</ins></var> <ins class= "diff-chg">callback should then be invoked.</ins> <h3 id="browser"><del class= "diff-old">4.5.</del> <ins class="diff-chg">4.6</ins> Browser state</h3> The <dfn id="navigator" title= "dom-navigator"><code>navigator</code></dfn> attribute of the <code><a href="#window">Window</a></code> interface must return an instance of the <code><a href= "#clientinformation">ClientInformation</a></code> interface, which represents the identity and state of the user agent (the client), and allows Web pages to register themselves as potential protocol and content handlers: <pre class="idl"> interface <dfn id="clientinformation">ClientInformation</dfn> { readonly attribute boolean <a href="#navigator.online" title= "dom-navigator-onLine">onLine</a>; void <a href="#registerprotocolhandler" title= "dom-navigator-registerProtocolHandler">registerProtocolHandler</a>(in DOMString protocol, in DOMString uri, in DOMString title); void <a href="#registercontenthandler" title= "dom-navigator-registerContentHandler">registerContentHandler</a>(in DOMString mimeType, in DOMString uri, in DOMString title); }; </pre> <h4 id="custom-handlers"><del class= "diff-old">4.5.1.</del> <ins class="diff-chg">4.6.1</ins> Custom protocol and content handlers</h4> The <dfn id="registerprotocolhandler" title= "dom-navigator-registerProtocolHandler"><code>registerProtocolHandler()</code></dfn> method allows Web sites to register themselves as possible handlers for particular protocols. For example, an online fax service could register itself as a handler of the <code>fax:</code> protocol ( <a href="#references">[RFC2806]</a> ), so that if the user clicks on such a link, he is given the opportunity to use that Web site. Analogously, the <dfn id="registercontenthandler" title= "dom-navigator-registerContentHandler"><code>registerContentHandler()</code></dfn> method allows Web sites to register themselves as possible handlers for content in a particular MIME type. For example, the same online fax service could register itself as a handler for <code>image/g3fax</code> files ( <a href= "#references">[RFC1494]</a> ), so that if the user has no native application capable of handling G3 Facsimile byte streams, his Web browser can instead suggest he use that site to view the image. User agents may, within the constraints described in this section, do whatever they like when the methods are called. A UA could, for instance, prompt the user and offer the user the opportunity to add the site to a shortlist of handlers, or make the handlers his default, or cancel the request. UAs could provide such a UI through modal UI or through a non-modal transient notification interface. UAs could also simply silently collect the information, providing it only when relevant to the user. There is <a href="#sample-handler-impl">an example of how these methods could be presented to the user</a> below. The arguments to the methods have the following meanings: <dl> <dt><var title="">protocol</var> ( <code title= "dom-navigator-registerProtocolHandler"><a href= "#registerprotocolhandler">registerProtocolHandler()</a></code> only)</dt> <dd> A scheme, such as <code>ftp</code> or <code>fax</code> . The scheme must be treated case-insensitively by user agents for the purposes of comparing with the scheme part of URIs that they consider against the list of registered handlers. The <var title="">protocol</var> value, if it contains a colon (as in " <code>ftp:</code> "), will never match anything, since schemes don't contain colons. </dd> <dt><var title="">mimeType</var> ( <code title= "dom-navigator-registerContentHandler"><a href= "#registercontenthandler">registerContentHandler()</a></code> only)</dt> <dd> A MIME type, such as <code>model/vrml</code> or <code>text/richtext</code> . The MIME type must be treated case-insensitively by user agents for the purposes of comparing with MIME types of documents that they consider against the list of registered handlers. User agents must compare the given values only to the MIME type/subtype parts of content types, not to the complete type including parameters. Thus, if <var title="">mimeType</var> values passed to this method include characters such as commas or whitespace, or include MIME parameters, then the handler being registered will never be used. </dd> <dt><var title="">uri</var></dt> <dd> The URI of the page that will handle the requests. When the user agent uses this URI, it must replace the first occurrence of the exact literal string " <code>%s</code> " with an escaped version of the URI of the content in question (as defined below), and then fetch the resulting URI using the GET method (or equivalent for non-HTTP URIs). To get the escaped version of the URI, first, the domain part of the URI (if any) must be converted to its punycode representation, and then, every character in the URI that is not in the ranges given in the next paragraph must be replaced by its UTF-8 byte representation, each byte being represented by a U+0025 (%) character and two digits in the range U+0030 (0) to U+0039 (9) and U+0041 (A) to U+0046 (F) giving the hexadecimal representation of the byte. The ranges of characters that must not be escaped are: U+002D (-), U+002E (.), U+0030 (0) to U+0039 (9), U+0041 (A) to U+005A (Z), U+005F (_), U+0061 (a) to U+007A (z), and U+007E (~). <div class="example"> If the user had visited a site that made the following call: <pre> navigator.registerContentHandler('application/x-soup', 'http://example.com/soup?url=%s', 'SoupWeb™') </pre> ...and then clicked on a link such as: <pre> <a href="http://www.example.net/chickenkïwi.soup"> Download our Chicken Kiwi soup!</a> </pre> ...then, assuming this <code>chickenkïwi.soup</code> file was served with the MIME type <code>application/x-soup</code> , the UA might navigate to the following URI: <pre> http://example.com/soup?url=https%3A%2F%2F2.zoppoz.workers.dev%3A443%2Fhttp%2Fwww.example.net%2Fchickenk%C3%AFwi.soup </pre> This site could then fetch the <code>chickenkïwi.soup</code> file and do whatever it is that it does with soup <del class= "diff-old">(synthesise</del> <ins class= "diff-chg">(synthesize</ins> it and ship it to the user, or whatever). </div> </dd> <dt><var title="">title</var></dt> <dd> A descriptive title of the handler, which the UA might use to remind the user what the site in question is. </dd> </dl> User agents should raise <a href="#security9" title= "security exception">security exceptions</a> if the methods are called with <var title="">protocol</var> or <var title= "">mimeType</var> values that the UA deems to be "privileged". For example, a site attempting to register a handler for <code>http</code> URIs or <code>text/html</code> content in a Web browser would likely cause an exception to be raised. User agents must raise a <code>SYNTAX_ERR</code> exception if the <var title="">uri</var> argument passed to one of these methods does not contain the exact literal string " <code>%s</code> ". User agents must not raise any other exceptions (other than binding-specific exceptions, such as for an incorrect number of arguments in an ECMAScript implementation). This section does not define how the pages registered by these methods are used, beyond the requirements on how to process the <var title="">uri</var> value (see above). To some extent, the <a href="#navigate" title="navigate">processing model for navigating across documents</a> defines some cases where these methods are relevant, but in general UAs may use this information wherever they would otherwise consider handing content to native plugins or helper applications. UAs must not use registered content handlers to handle content that was returned as part of a non-GET transaction (or rather, as part of any non-idempotent transaction), as the remote site would not be able to fetch the same data. <h5 id="security5"><del class= "diff-old">4.5.1.1.</del> <ins class= "diff-chg">4.6.1.1.</ins> Security and privacy</h5> These mechanisms can introduce a number of concerns, in particular privacy concerns. Hijacking all Web usage. User agents should not allow protocols that are key to its normal operation, such as <code>http</code> or <code>https</code> , to be rerouted through third-party sites. This would allow a user's activities to be trivially tracked, and would allow user information, even in secure connections, to be collected. Hijacking defaults. It is strongly recommended that user agents do not automatically change any defaults, as this could lead the user to send data to remote hosts that the user is not expecting. New handlers registering themselves should never automatically cause those sites to be used. Registration spamming. User agents should consider the possibility that a site will attempt to register a large number of handlers, possibly from multiple domains (e.g. by redirecting through a series of pages each on a different domain, and each registering a handler for <code>video/mpeg</code> — analogous practices abusing other Web browser features have been used by pornography Web sites for many years). User agents should gracefully handle such hostile attempts, protecting the user. Misleading titles. User agents should not rely <del class="diff-old">wholy</del> <ins class= "diff-chg">wholly</ins> on the <var title="">title</var> argument to the methods when presenting the registered handlers to the user, since sites could easily lie. For example, a site <code>hostile.example.net</code> could claim that it was registering the "Cuddly Bear Happy Content Handler". User agents should therefore use the handler's domain in any UI along with any title. Hostile handler metadata. User agents should protect against typical attacks against strings embedded in their interface, for example ensuring that markup or escape characters in such strings are not executed, that null bytes are properly handled, that over-long strings do not cause crashes or buffer overruns, and so forth. Leaking Intranet URIs. The mechanism described in this section can result in secret Intranet URIs being leaked, in the following manner: <ol> <li>The user registers a third-party content handler as the default handler for a content type.</li> <li>The user then browses his corporate Intranet site and accesses a document that uses that content type.</li> <li>The user agent contacts the third party and hands the third party the URI to the Intranet content.</li> </ol> No actual confidential file data is leaked in this manner, but the URIs themselves could contain confidential information. For example, the URI could be <code>https://www.corp.example.com/upcoming-aquisitions/samples.egf</code> , which might tell the third party that Example Corporation is intending to merge with Samples LLC. Implementors might wish to consider allowing administrators to disable this feature for certain subdomains, content types, or protocols. Leaking secure URIs. User agents should not send HTTPS URIs to third-party sites registered as content handlers, in the same way that user agents do not send <code>Referer</code> headers from secure sites to third-party sites. Leaking credentials. User agents must never send username or password information in the URIs that are escaped and included sent to the handler sites. User agents may even avoid attempting to pass to Web-based handlers the URIs of resources that are known to require authentication to access, as such sites would be unable to access the resources in question without prompting the user for credentials themselves (a practice that would require the user to know whether to trust the third-party handler, a decision many users are unable to make or even understand). <h5 id="sample-handler-impl"><del class= "diff-old">4.5.1.2.</del> <ins class= "diff-chg">4.6.1.2.</ins> Sample user interface</h5> This section is non-normative. A simple implementation of this feature for a desktop Web browser might work as follows. The <code title="dom-navigator-registerProtocolHandler"><a href= "#registerprotocolhandler">registerProtocolHandler()</a></code> method could display a modal dialog box: <pre> ||[ Protocol Handler Registration ]||||||||||||||||||||||||||| | | | This Web page: | | | | Kittens at work | | http://kittens.example.org/ | | | | ...would like permission to handle the protocol "x-meow:" | | using the following Web-based application: | | | | Kittens-at-work displayer | | http://kittens.example.org/?show=%s | | | | Do you trust the administrators of the "kittens.example. | | org" domain? | | | | ( Trust kittens.example.org ) (( Cancel )) | |____________________________________________________________| </pre> ...where "Kittens at work" is the title of the page that invoked the method, "http://kittens.example.org/" is the URI of that page, "x-meow" is the string that was passed to the <code title= "dom-navigator-registerProtocolHandler"><a href= "#registerprotocolhandler">registerProtocolHandler()</a></code> method as its first argument ( <var title="">protocol</var> ), "http://kittens.example.org/?show=%s" was the second argument ( <var title="">uri</var> ), and "Kittens-at-work displayer" was the third argument ( <var title="">title</var> ). If the user clicks the Cancel button, then nothing further happens. If the user clicks the "Trust" button, then the handler is remembered. When the user then attempts to fetch a URI that uses the "x-meow:" scheme, then it might display a dialog as follows: <pre> ||[ Unknown Protocol ]|||||||||||||||||||||||||||||||||||||||| | | | You have attempted to access: | | | | x-meow:S2l0dGVucyBhcmUgdGhlIGN1dGVzdCE%3D | | | | How would you like FerretBrowser to handle this resource? | | | | (o) Contact the FerretBrowser plugin registry to see if | | there is an official way to handle this resource. | | | | ( ) Pass this URI to a local application: | | [ /no application selected/ ] ( Choose ) | | | | ( ) Pass this URI to the "Kittens-at-work displayer" | | application at "kittens.example.org". | | | | [ ] Always do this for resources using the "x-meow" | | protocol in future. | | | | ( Ok ) (( Cancel )) | |____________________________________________________________| </pre> ...where the third option is the one that was primed by the site registering itself earlier. If the user does select that option, then the browser, in accordance with the requirements described in the previous two sections, will redirect the user to "http://kittens.example.org/?show=x-meow%3AS2l0dGVucyBhcmUgdGhlIGN1dGVzdCE%253D". The <code title="dom-navigator-registerContentHandler"><a href= "#registercontenthandler">registerContentHandler()</a></code> method would work equivalently, but for unknown MIME types instead of unknown protocols. <h3 id="offline"><del class= "diff-old">4.6.</del> <ins class="diff-chg">4.7</ins> Offline Web applications</h3> <h4 id="introduction1"><del class= "diff-old">4.6.1.</del> <ins class="diff-chg">4.7.1</ins> Introduction</h4> <ins class="diff-new">This section is non-normative.</ins> ... <h4 id="appcache"><del class= "diff-old">4.6.2.</del> <ins class="diff-chg">4.7.2</ins> Application caches</h4> An <dfn id="application0">application cache</dfn> is a collection of resources. An application cache is identified by the URI of a resource manifest which is used to populate the cache. Application caches are versioned, and there can be different instances of caches for the same manifest URI, each having a different version. A cache is newer than another if it was created after the other (in other words, caches in a group have a chronological order). Each group of application caches for the same manifest URI have a common <dfn id="update0" title="concept-appcache-status">update status</dfn> , which is one of the following: idle , checking , downloading . A <a href="#browsing1">browsing context</a> can be associated with an application cache. A <a href= "#child">child browsing context</a> is always associated with the same <del class="diff-old">browsing context</del> <ins class= "diff-chg">application cache</ins> as its <a href="#parent">parent browsing context</a> , if any. A <a href="#top-level">top-level browsing context</a> is associated with the application cache appropriate for its <a href="#active">active document</a> . (A browsing context's associated cache thus can <a href= "#appcache-history-2">change</a> during <a href="#traverse" title= "traverse the history">session history traversal</a> .) A <code>Document</code> initially has no appropriate cache, but steps <a href="#parser-appcache">in the parser</a> and in the <a href="#navigate" title="navigate">navigation</a> sections cause <a href="#application2" title= "concept-appcache-init-with-attribute">cache selection</a> to occur early in the page load process. An application cache consists of: <ul> <li> One of more resources (including their out-of-band metadata, such as HTTP headers, if any), identified by URIs, each falling into one (or more) of the following categories: <dl> <dt><dfn id="implicit" title="concept-appcache-implicit">Implicit entries</dfn></dt> <dd>Documents that were added to the cache because a <a href= "#top-level">top-level browsing context</a> was <a href="#navigate" title="navigate">navigated</a> to that document and the document indicated that this was its cache, using the <code title= "attr-html-manifest"><a href="#manifest">manifest</a></code> attribute.</dd> <dt><dfn id="the-manifest" title="concept-appcache-manifest">The manifest</dfn></dt> <dd>The resource corresponding to the URI that was given in an implicit entry's <code><a href="#html">html</a></code> element's <code title="attr-html-manifest"><a href= "#manifest">manifest</a></code> attribute. The manifest is downloaded and processed during the <a href= "#application1">application cache update process</a> . All the <a href="#implicit" title="concept-appcache-implicit">implicit entries</a> have the <a href="#same-origin" title= "same origin">same <del class="diff-old">scheme/host/port</del> <ins class="diff-chg">origin</ins></a> as the manifest.</dd> <dt><dfn id="explicit" title="concept-appcache-explicit">Explicit entries</dfn></dt> <dd>Resources that were listed in the cache's <a href= "#the-manifest" title="concept-appcache-manifest">manifest</a> . Explicit entries can also be marked as <dfn id="foreign" title= "concept-appcache-foreign">foreign</dfn> , which means that they have <del class="diff-old">an</del> <ins class="diff-chg">a</ins> <code title="attr-html-manifest"><a href= "#manifest">manifest</a></code> attribute but that it doesn't point at this cache's <a href="#the-manifest" title= "concept-appcache-manifest">manifest</a> .</dd> <dt><dfn id="fallback0" title="concept-appcache-fallback">Fallback entries</dfn></dt> <dd>Resources that were listed in the cache's <a href= "#the-manifest" title="concept-appcache-manifest">manifest</a> as fallback entries.</dd> <dt><dfn id="opportunistically" title= "concept-appcache-oppcache">Opportunistically cached entries</dfn></dt> <dd>Resources whose URIs <a href="#matches" title= "concept-appcache-matches-oppcache">matched</a> an <a href= "#opportunistic" title="concept-appcache-oppcache-ns">opportunistic caching namespace</a> when they were fetched, and were therefore cached in the application cache.</dd> <dt><dfn id="dynamic3" title="concept-appcache-dynamic">Dynamic entries</dfn></dt> <dd>Resources that were added to the cache by the <code title= "dom-appcache-add"><a href="#adduri">add()</a></code> method.</dd> </dl> A URI in the list can be flagged with multiple different types, and thus an entry can end up being <del class= "diff-old">categorised</del> <ins class= "diff-chg">categorized</ins> as multiple entries. For example, an entry can be an explicit entry and a dynamic entry at the same time. </li> <li>Zero or more <dfn id="opportunistic" title= "concept-appcache-oppcache-ns">opportunistic caching namespaces</dfn> : URIs, used as <a href="#matches" title= "concept-appcache-matches-oppcache">prefix match patterns</a> , each of which is mapped to a <a href="#fallback0" title= "concept-appcache-fallback">fallback entry</a> . Each namespace URI prefix, when parsed as a URI, has the <a href="#same-origin">same <del class="diff-old">scheme/host/port</del> <ins class= "diff-chg">origin</ins></a> as <a href="#the-manifest" title= "concept-appcache-manifest">the manifest</a> .</li> <li>Zero or more URIs that form the <dfn id="online" title= "concept-appcache-onlinewhitelist">online whitelist</dfn> .</li> </ul> Multiple application caches can contain the same resource, e.g. if their manifests all reference that resource. If the user agent is to <dfn id="select0" title="concept-appcache-selection">select an application cache</dfn> from a list of caches that contain a resource, that the user agent must use the application cache that the user most likely wants to see the resource from, taking into account the following: <ul> <li>which application cache was most recently updated,</li> <li>which application cache was being used to display the resource from which the user decided to look at the new resource, and</li> <li>which application cache the user prefers.</li> </ul> <h4 id="manifests"><del class= "diff-old">4.6.3.</del> <ins class="diff-chg">4.7.3</ins> The cache manifest syntax</h4> <h5 id="writing"><del class= "diff-old">4.6.3.1.</del> <ins class= "diff-chg">4.7.3.1.</ins> Writing cache manifests</h5> Manifests must be served using the <code title= "">text/cache-manifest</code> MIME type. All resources served using the <code title="">text/cache-manifest</code> MIME type must follow the syntax of application cache manifests, as described in this section. An application cache manifest is a text file, whose text is encoded using UTF-8. Data in application cache manifests is line-based. Newlines must be represented by U+000A LINE FEED (LF) characters, U+000D CARRIAGE RETURN (CR) characters, or U+000D CARRIAGE RETURN (CR) U+000A LINE FEED (LF) pairs. This is a willful double violation of RFC2046. <a href="#references"><ins class="diff-new">[RFC2046]</ins></a> The first line of an application cache manifest must consist of the string "CACHE", a single U+0020 SPACE character, the string "MANIFEST", and zero or more U+0020 SPACE and U+0009 CHARACTER TABULATION (tab) characters. <ins class="diff-new">The first line may optionally be preceded by a U+FEFF BYTE ORDER MARK (BOM) character.</ins> If any other text is found on the first line, the user agent will ignore the entire file. <del class="diff-old">The first line may optionally be preceded by a U+FEFF BYTE ORDER MARK (BOM) character.</del> Subsequent lines, if any, must all be one of the following: <dl> <dt>A blank line</dt> <dd> Blank lines must consist of zero or more U+0020 SPACE and U+0009 CHARACTER TABULATION (tab) characters only. </dd> <dt>A comment</dt> <dd> Comment lines must consist of zero or more U+0020 SPACE and U+0009 CHARACTER TABULATION (tab) characters, followed by a single U+0023 NUMBER SIGN (#) character, followed by zero or more characters other than U+000A LINE FEED (LF) and U+000D CARRIAGE RETURN (CR) characters. Comments must be on a line on their own. If they were to be included on a line with a URI, the "#" would be mistaken for part of a fragment identifier. </dd> <dt>A section header</dt> <dd> Section headers change the current section. There are three possible section headers: <dl> <dt><code>CACHE:</code></dt> <dd>Switches to the explicit section.</dd> <dt><code>FALLBACK:</code></dt> <dd>Switches to the fallback section.</dd> <dt><code>NETWORK:</code></dt> <dd>Switches to the online whitelist section.</dd> </dl> Section header lines must consist of zero or more U+0020 SPACE and U+0009 CHARACTER TABULATION (tab) characters, followed by one of the names above (including the U+003A COLON (:) character) followed by zero or more U+0020 SPACE and U+0009 CHARACTER TABULATION (tab) characters. Ironically, by default, the current section is the explicit section. </dd> <dt>Data for the current section</dt> <dd> The format that data lines must take depends on the current section. When the current section is the explicit section or the online whitelist section, data lines must consist of zero or more U+0020 SPACE and U+0009 CHARACTER TABULATION (tab) characters, a valid URI reference or IRI <del class="diff-old">reference,</del> <ins class= "diff-chg">reference to a resource other than the manifest itself,</ins> and then zero or more U+0020 SPACE and U+0009 CHARACTER TABULATION (tab) characters. <a href= "#references">[RFC3986]</a> <a href="#references">[RFC3987]</a> When the current section is the fallback section, data lines must consist of zero or more U+0020 SPACE and U+0009 CHARACTER TABULATION (tab) characters, a valid URI reference or IRI <del class="diff-old">reference,</del> <ins class= "diff-chg">reference to a resource other than the manifest itself,</ins> one or more U+0020 SPACE and U+0009 CHARACTER TABULATION (tab) characters, another valid URI reference or IRI <del class="diff-old">reference,</del> <ins class= "diff-chg">reference to a resource other than the manifest itself,</ins> and then zero or more U+0020 SPACE and U+0009 CHARACTER TABULATION (tab) characters. <a href= "#references">[RFC3986]</a> <a href="#references">[RFC3987]</a> <ins class="diff-new">The URI or IRI references in data lines can't be empty strings, since those would be relative URIs to the manifest itself. Such lines would be confused with blank or invalid lines, anyway.</ins> </dd> </dl> Manifests may contain sections more than once. Sections may be empty. URIs that are to be fallback pages associated with <a href= "#opportunistic" title="concept-appcache-oppcache-ns">opportunistic caching namespaces</a> , and those namespaces themselves, must be given in fallback sections, with the namespace being the first URI of the data line, and the corresponding fallback page being the second URI. All the other pages to be cached must be listed in explicit sections. <a href="#opportunistic" title= "concept-appcache-oppcache-ns">Opportunistic caching namespaces</a> must have the <a href="#same-origin">same <del class= "diff-old">scheme/host/port</del> <ins class= "diff-chg">origin</ins></a> as the manifest itself. An opportunistic caching namespace must not be listed more than once. URIs that the user agent is to put into the <a href="#online" title="concept-appcache-onlinewhitelist">online whitelist</a> must all be specified in online whitelist sections. (This is needed for any URI that the page is intending to use to communicate back to the server.) URIs in the online whitelist section must not also be listed in explicit section, and must not be listed as fallback entries in the fallback section. (URIs in the online whitelist section may match opportunistic caching namespaces, however.) Relative URIs must be given relative to the manifest's own URI. URIs in manifests must not have fragment identifiers. <h5 id="parsing0"><del class= "diff-old">4.6.3.2.</del> <ins class= "diff-chg">4.7.3.2.</ins> Parsing cache manifests</h5> When a user agent is to <dfn id="parse0">parse a manifest</dfn> , it means that the user agent must run the following steps: <ol> <li> The user agent must decode the <del class= "diff-old">bytestream</del> <ins class="diff-chg">byte stream</ins> corresponding with the manifest to be parsed, treating it as UTF-8. Bytes or sequences of bytes that are not valid UTF-8 sequences must be interpreted as a U+FFFD REPLACEMENT CHARACTER. <del class= "diff-old">All U+0000 NULL characters must be replaced by U+FFFD REPLACEMENT CHARACTERs.</del> </li> <li> Let <var title="">explicit URIs</var> be an initially empty list of <a href="#explicit" title="concept-appcache-explicit">explicit entries</a> . </li> <li> Let <var title="">fallback URIs</var> be an initially empty mapping of <a href="#opportunistic" title= "concept-appcache-oppcache-ns">opportunistic caching namespaces</a> to <a href="#fallback0" title="concept-appcache-fallback">fallback entries</a> . </li> <li> Let <var title="">online whitelist URIs</var> be an initially empty list of URIs for a <a href="#online" title= "concept-appcache-onlinewhitelist">online whitelist</a> . </li> <li> Let <var title="">input</var> be the decoded text of the manifest's <del class="diff-old">bytestream.</del> <ins class= "diff-chg">byte stream.</ins> </li> <li> Let <var title="">position</var> be a pointer into <var title= "">input</var> , initially pointing at the first character. </li> <li> If <var title="">position</var> is pointing at a U+FEFF BYTE ORDER MARK (BOM) character, then advance <var title= "">position</var> to the next character. </li> <li> If the characters starting from <var title="">position</var> are "CACHE", followed by a U+0020 SPACE character, followed by "MANIFEST", then advance <var title="">position</var> to the next character after those. Otherwise, this isn't a cache manifest; abort this algorithm with a failure while checking for the magic signature. </li> <li> <a href="#collect">Collect a sequence of characters</a> that are U+0020 SPACE or U+0009 CHARACTER TABULATION (tab) characters. </li> <li> If <var title="">position</var> is not past the end of <var title="">input</var> and the character at <var title= "">position</var> is neither a U+000A LINE FEED (LF) characters nor a U+000D CARRIAGE RETURN (CR) character, then this isn't a cache manifest; abort this algorithm with a failure while checking for the magic signature. </li> <li> This is a cache manifest. The algorithm cannot fail beyond this point (though bogus lines can get ignored). </li> <li> Let <var title="">mode</var> be "explicit". </li> <li> Start of line : If <var title="">position</var> is past the end of <var title="">input</var> , then jump to the last step. Otherwise, <a href="#collect">collect a sequence of characters</a> that are U+000A LINE FEED (LF), U+000D CARRIAGE RETURN (CR), U+0020 SPACE, or U+0009 CHARACTER TABULATION (tab) characters. </li> <li> Now, <a href="#collect">collect a sequence of characters</a> that are not U+000A LINE FEED (LF) or U+000D CARRIAGE RETURN (CR) characters, and let the result be <var title= "">line</var> . </li> <li> <ins class="diff-new">Drop any trailing U+0020 SPACE, or U+0009 CHARACTER TABULATION (tab) characters at the end of</ins> <var title=""><ins class="diff-new">line</ins></var> . </li> <li> <ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">line</ins></var> <ins class="diff-new">is the empty string, then jump back to the step labeled "start of line".</ins> </li> <li> If the first character in <var title="">line</var> is a U+0023 NUMBER SIGN (#) character, then jump back to the step <del class= "diff-old">labelled</del> <ins class="diff-chg">labeled</ins> "start of line". </li> <li> <del class="diff-old">Drop any trailing U+0020 SPACE, or U+0009 CHARACTER TABULATION (tab) characters at the end of line .</del> If <var title="">line</var> equals "CACHE:" (the word "CACHE" followed by a U+003A COLON (:) character), then set <var title="">mode</var> to "explicit" and jump back to the step <del class= "diff-old">labelled</del> <ins class="diff-chg">labeled</ins> "start of line". </li> <li> If <var title="">line</var> equals "FALLBACK:" (the word "FALLBACK" followed by a U+003A COLON (:) character), then set <var title="">mode</var> to "fallback" and jump back to the step <del class="diff-old">labelled</del> <ins class= "diff-chg">labeled</ins> "start of line". </li> <li> If <var title="">line</var> equals "NETWORK:" (the word "NETWORK" followed by a U+003A COLON (:) character), then set <var title="">mode</var> to "online whitelist" and jump back to the step <del class="diff-old">labelled</del> <ins class= "diff-chg">labeled</ins> "start of line". </li> <li> This is either a data line or it is syntactically incorrect. <dl class="switch"> <dt>If <var title="">mode</var> is "explicit"</dt> <dd> If <var title="">line</var> is not a syntactically <del class= "diff-old">valid</del> <ins class="diff-chg">correct</ins> URI reference or IRI reference, then jump back to the step <del class= "diff-old">labelled</del> <ins class="diff-chg">labeled</ins> "start of line". Otherwise, resolve the URI reference or IRI reference to an absolute URI or IRI, and drop the fragment identifier, if any. Now, if the resource's URI has a different <scheme> component than the manifest's <del class="diff-old">URI,</del> <ins class="diff-chg">URI (compared case-insensitively),</ins> then jump back to the step <del class="diff-old">labelled</del> <ins class="diff-chg">labeled</ins> "start of line". Otherwise, add this URI to the <var title="">explicit URIs</var> . </dd> <dt>If <var title="">mode</var> is "fallback"</dt> <dd> If <var title="">line</var> does not contain at least one U+0020 SPACE or U+0009 CHARACTER TABULATION (tab) character, then jump back to the step <del class="diff-old">labelled</del> <ins class= "diff-chg">labeled</ins> "start of line". Otherwise, let everything before the first U+0020 SPACE or U+0009 CHARACTER TABULATION (tab) character in <var title= "">line</var> be <var title="">part one</var> , and let everything after the first U+0020 SPACE or U+0009 CHARACTER TABULATION (tab) character in <var title="">line</var> be <var title="">part two</var> . Strip any leading U+0020 SPACE or U+0009 CHARACTER TABULATION (tab) characters in <var title="">part two</var> . If <var title="">part one</var> and <var title="">part two</var> are not both syntactically <del class="diff-old">valid</del> <ins class="diff-chg">correct</ins> URI or IRI references, then jump back to the step <del class="diff-old">labelled</del> <ins class="diff-chg">labeled</ins> "start of line". Resolve the URI or IRI references in <var title="">part one</var> and <var title="">part two</var> to absolute URIs or <del class="diff-old">IRIs.</del> <ins class="diff-chg">IRIs, and drop the fragment identifiers, if any.</ins> If the absolute URI or IRI corresponding to <var title="">part one</var> is already in the <var title="">fallback URIs</var> mapping as an <a href="#opportunistic" title= "concept-appcache-oppcache-ns">opportunistic caching namespace</a> , then jump back to the step <del class="diff-old">labelled</del> <ins class="diff-chg">labeled</ins> "start of line". If the absolute URI or IRI corresponding to <var title="">part one</var> does not have the <a href="#same-origin">same <del class= "diff-old">scheme/host/port</del> <ins class= "diff-chg">origin</ins></a> as the manifest's URI, then jump back to the step <del class="diff-old">labelled</del> <ins class= "diff-chg">labeled</ins> "start of line". If the absolute URI or IRI corresponding to <var title="">part two</var> has a different <scheme> component than the manifest's <del class="diff-old">URI,</del> <ins class= "diff-chg">URI (compared case-insensitively ),</ins> then jump back to the step <del class="diff-old">labelled</del> <ins class= "diff-chg">labeled</ins> "start of line". Otherwise, add the absolute URI or IRI corresponding to <var title="">part one</var> to the <var title="">fallback URIs</var> mapping as an <a href="#opportunistic" title= "concept-appcache-oppcache-ns">opportunistic caching namespace</a> , mapped to the absolute URI corresponding to <var title="">part two</var> as the <a href="#fallback0" title= "concept-appcache-fallback">fallback entry</a> . </dd> <dt>If <var title="">mode</var> is "online whitelist"</dt> <dd> If <var title="">line</var> is not a syntactically <del class= "diff-old">valid</del> <ins class="diff-chg">correct</ins> URI reference or IRI reference, then jump back to the step <del class= "diff-old">labelled</del> <ins class="diff-chg">labeled</ins> "start of line". Otherwise, resolve the URI reference or IRI reference to an absolute URI or IRI, and drop the fragment identifier, if any. Now, if the resource's URI has a different <scheme> component than the manifest's URI, then jump back to the step <del class="diff-old">labelled</del> <ins class= "diff-chg">labeled</ins> "start of line". Otherwise, add this URI to the <var title="">online whitelist URIs</var> . </dd> </dl> </li> <li> Jump back to the step <del class="diff-old">labelled</del> <ins class="diff-chg">labeled</ins> "start of line". (That step jumps to the next, and last, step when the end of the file is reached.) </li> <li> Return the <var title="">explicit URIs</var> list, the <var title="">fallback URIs</var> mapping, and the <var title= "">online whitelist URIs</var> . </li> </ol> Relative URI references and IRI references resolved to absolute URIs or IRIs in the above algorithm must <del class= "diff-old">use</del> <ins class="diff-chg">be resolved according to section 5.1 of RFC3986 (i.e. relative to</ins> the <del class= "diff-old">manifest's</del> <ins class="diff-chg">base</ins> URI <del class="diff-old">as</del> <ins class="diff-chg">from the encapsulating entity or</ins> the <del class="diff-old">Base</del> URI <del class="diff-old">from</del> <ins class="diff-chg">used to retrieve</ins> the <del class="diff-old">Retrieval</del> <ins class="diff-chg">entity, since there is no way to embed a base</ins> URI <del class="diff-old">for</del> <ins class= "diff-chg">in</ins> the <del class="diff-old">purposes reference resolution as defined by RFC 3986.</del> <ins class= "diff-chg">manifest itself).</ins> <a href= "#references">[RFC3986]</a> If a resource is listed in both the online whitelist and in the explicit section, then that resource will be downloaded and cached, but when the page tries to use this resource, the user agent will ignore the cached copy and attempt to fetch the file from the network. Indeed, the cached copy will only be used if it is opened from a top-level browsing context. <h4 id="updating1"><del class= "diff-old">4.6.4.</del> <ins class="diff-chg">4.7.4</ins> Updating an application cache</h4> When the user agent is required (by other parts of this specification) to start the <dfn id="application1">application cache update process</dfn> , the user agent must run the following steps: the event stuff needs to be more consistent -- something about showing every step of the ui or no steps or something; and we need to deal with showing ui for browsing contexts that open when an update is already in progress, and we may need to give applications control over the ui the first time they cache themselves (right now the original cache is done without notifications to the browsing contexts) <ol> <li> Let <var title="">manifest URI</var> be the URI of the <a href= "#the-manifest" title="concept-appcache-manifest">manifest</a> of the cache to be updated. </li> <li> Let <var title="">cache group</var> be the group of <a href= "#application0" title="application cache">application caches</a> identified by <var title="">manifest URI</var> . </li> <li> Let <var title="">cache</var> be the most recently updated <a href="#application0">application cache</a> identified by <var title="">manifest URI</var> (that is, the newest version found in <var title="">cache group</var> ). </li> <li> If the <a href="#update0" title= "concept-appcache-status">status</a> of the <var title="">cache group</var> is either checking or downloading , then abort these steps, as an update is already in progress for them. Otherwise, set the <a href="#update0" title= "concept-appcache-status">status</a> of this group of caches to checking . This entire step must be performed as one atomic operation so as to avoid race conditions. </li> <li> If there is already a resource with the URI of <var title= "">manifest URI</var> in <var title="">cache</var> , and that resource is <del class="diff-old">categorised</del> <ins class= "diff-chg">categorized</ins> as a <a href="#the-manifest" title= "concept-appcache-manifest">manifest</a> , then this is an <dfn id= "upgrade" title="concept-appcache-upgrade">upgrade attempt</dfn> . Otherwise, this is a <dfn id="cache" title= "concept-appcache-cache">cache attempt</dfn> . If this is a <a href="#cache" title= "concept-appcache-cache">cache attempt</a> , then <var title= "">cache</var> is forcibly the only application cache in <var title="">cache group</var> , and it hasn't ever been populated from its manifest (i.e. this update is an attempt to download the application for the first time). It also can't have any browsing contexts associated with it. </li> <li> <a href="#firing2">Fire a simple event</a> called <code title= "event-checking">checking</code> at the <code><a href= "#applicationcache">ApplicationCache</a></code> singleton of each <a href="#top-level">top-level browsing context</a> that is associated with a cache in <var title="">cache group</var> . The default action of this event should be the display of some sort of user interface indicating to the user that the user agent is checking for the availability of updates. </li> <li> Fetch the resource from <var title="">manifest URI</var> , and let <var title="">manifest</var> be that resource. If the resource is <del class="diff-old">labelled</del> <ins class="diff-chg">labeled</ins> with the MIME type <code title= "">text/cache-manifest</code> , parse <var title="">manifest</var> according to the <a href="#parse0" title="parse a manifest">rules for parsing manifests</a> , obtaining a list of <a href="#explicit" title="concept-appcache-explicit">explicit entries</a> , <a href= "#fallback0" title="concept-appcache-fallback">fallback entries</a> and the <a href="#opportunistic" title= "concept-appcache-oppcache-ns">opportunistic caching namespaces</a> that map to them, and entries for the <a href="#online" title= "concept-appcache-onlinewhitelist">online whitelist</a> . </li> <li> If the previous step fails (e.g. the server returns a 4xx or 5xx response or equivalent, or there is a DNS error, or the connection times out, or the <ins class="diff-new">user cancels the download, or the</ins> parser for manifests fails when checking the magic signature), or if the resource is <del class= "diff-old">labelled</del> <ins class="diff-chg">labeled</ins> with a MIME type other than <code title="">text/cache-manifest</code> , then run <del class="diff-old">these substeps: Fire a simple event called error at the ApplicationCache singleton of each top-level browsing context that is associated with a cache in cache group . The default action of this event should be the display of some sort of user interface indicating to the user that the user agent failed to save</del> the <del class="diff-old">application for offline use. If this is a cache attempt , then discard</del> <a href= "#cache0">cache <del class="diff-old">and abort the update process, optionally alerting the user to the failure. Otherwise, jump to the last step in the overall set of</del> <ins class= "diff-chg">failure</ins> steps <del class="diff-old">of the update process.</del></a> . </li> <li> If this is an <a href="#upgrade" title= "concept-appcache-upgrade">upgrade attempt</a> and the newly downloaded <var title="">manifest</var> is byte-for-byte identical to the manifest found in <var title="">cache</var> , or if the server reported it as "304 Not Modified" or equivalent, then <ins class="diff-new">run these substeps:</ins> <ol> <li> <a href="#firing2"><del class="diff-old">fire</del> <ins class= "diff-chg">Fire</ins> a simple event</a> called <code title= "event-noupdate">noupdate</code> at the <code><a href= "#applicationcache">ApplicationCache</a></code> singleton of each <a href="#top-level">top-level browsing context</a> that is associated with a cache in <var title="">cache group</var> . The default action of this event should be the display of some sort of user interface indicating to the user that the application is up to date. <del class="diff-old">Then, jump</del> </li> <li> <ins class="diff-chg">If there are any pending downloads of</ins> <ins class= "diff-chg">implicit entries</ins> <ins class="diff-chg">that are being stored in the cache, then wait for all of them</ins> to <ins class="diff-new">have completed. If any of these downloads fail (e.g.</ins> the <del class="diff-old">last step</del> <ins class="diff-chg">server returns a 4xx or 5xx response or equivalent, or there is a DNS error, or the connection times out, or the user cancels the download), then run the</ins> <a href= "#cache0"><ins class="diff-chg">cache failure steps</ins></a> . </li> <li> <ins class="diff-chg">Let the</ins> <a href="#update0" title= "concept-appcache-status"><ins class="diff-chg">status</ins></a> of the <ins class="diff-new">group of caches to which</ins> <var title=""><ins class="diff-new">cache</ins></var> <ins class= "diff-new">belongs be</ins> <ins class="diff-new">idle</ins> .<ins class="diff-new">If appropriate, remove any user interface indicating that an update for this cache is in progress.</ins> </li> <li> <ins class="diff-new">Abort the</ins> update process. </li> </ol> </li> <li> Set the <a href="#update0" title= "concept-appcache-status">status</a> of <var title="">cache group</var> to downloading . </li> <li> <a href="#firing2">Fire a simple event</a> called <code title= "event-downloading">downloading</code> at the <code><a href= "#applicationcache">ApplicationCache</a></code> singleton of each <a href="#top-level">top-level browsing context</a> that is associated with a cache in <var title="">cache group</var> . The default action of this event should be the display of some sort of user interface indicating to the user that a new version is being downloaded. </li> <li> If this is an <a href="#upgrade" title= "concept-appcache-upgrade">upgrade attempt</a> , then let <var title="">new cache</var> be a newly created <a href= "#application0">application cache</a> identified by manifest URI , being a new version in <var title="">cache group</var> . Otherwise, let <var title="">new cache</var> and <var title="">cache</var> be the same version of the application cache. </li> <li> Let <var title="">file list</var> be an empty list of URIs with flags. </li> <li> Add all the URIs in the list of <a href="#explicit" title= "concept-appcache-explicit">explicit entries</a> obtained by parsing <var title="">manifest</var> to <var title="">file list</var> , each flagged with "explicit entry". </li> <li> Add all the URIs in the list of <a href="#fallback0" title= "concept-appcache-fallback">fallback entries</a> obtained by parsing <var title="">manifest</var> to <var title="">file list</var> , each flagged with "fallback entry". </li> <li> If this is an <a href="#upgrade" title= "concept-appcache-upgrade">upgrade attempt</a> , then add all the URIs of <a href="#opportunistically" title= "concept-appcache-oppcache">opportunistically cached entries</a> in <var title="">cache</var> that <a href="#matches" title= "concept-appcache-matches-oppcache">match</a> the <a href= "#opportunistic" title="concept-appcache-oppcache-ns">opportunistic caching namespaces</a> obtained by parsing <var title= "">manifest</var> to <var title="">file list</var> , each flagged with "opportunistic entry". </li> <li> If this is an <a href="#upgrade" title= "concept-appcache-upgrade">upgrade attempt</a> , then add all the URIs of <a href="#implicit" title= "concept-appcache-implicit">implicit entries</a> in <var title= "">cache</var> to <var title="">file list</var> , each flagged with "implicit entry". </li> <li> If this is an <a href="#upgrade" title= "concept-appcache-upgrade">upgrade attempt</a> , then add all the URIs of <a href="#dynamic3" title= "concept-appcache-dynamic">dynamic entries</a> in <var title= "">cache</var> to <var title="">file list</var> , each flagged with "dynamic entry". </li> <li> If any URI is in <var title="">file list</var> more than once, then merge the entries into one entry for that URI, that entry having all the flags that the original entries had. </li> <li> For each URI in <var title="">file list</var> , run the following <del class="diff-old">steps:</del> <ins class= "diff-chg">steps. These steps may be run in parallel for two or more of the URIs at a time.</ins> <ol> <li> <a href="#firing2">Fire a simple event</a> called <code title= "event-progress"><a href="#progress0">progress</a></code> at the <code><a href="#applicationcache">ApplicationCache</a></code> singleton of each <a href="#top-level">top-level browsing context</a> that is associated with a cache in <var title="">cache group</var> . The default action of this event should be the display of some sort of user interface indicating to the user that a file is being downloaded in preparation for updating the application. </li> <li> Fetch the resource. If this is an <a href="#upgrade" title= "concept-appcache-upgrade">upgrade attempt</a> , then use <var title="">cache</var> as an HTTP cache, and <del class= "diff-old">honour</del> <ins class="diff-chg">honor</ins> HTTP caching semantics (such as expiration, ETags, and so forth) with respect to that cache. User agents may also have other caches in place that are also honored. <ins class="diff-new">If the resource in question is already being downloaded for other reasons then the existing download process may be used for the purposes of this step.</ins> <ins class="diff-new">An example of a resource that might already be being downloaded is a large image on a Web page that is being seen for the first time. The image would get downloaded to satisfy the</ins> <code><a href="#img"><ins class= "diff-new">img</ins></a></code> <ins class="diff-new">element on the page, as well as being listed in the cache manifest. According to the previous paragraph, that image only need be downloaded once, and it can be used both for the cache and for the rendered Web page.</ins> </li> <li> If the previous steps fails (e.g. the server returns a 4xx or 5xx response or equivalent, or there is a DNS error, or the connection times <del class="diff-old">out), then run these substeps: Fire a simple event called error at the ApplicationCache singleton of each top-level browsing context that is associated with a cache in cache group . The default action of this event should be the display of some sort of user interface indicating to the user that</del> <ins class="diff-chg">out, or</ins> the user <del class="diff-old">agent failed to save</del> <ins class= "diff-chg">cancels</ins> the <del class="diff-old">application for offline use. If this is a cache attempt ,</del> <ins class= "diff-chg">download),</ins> then <del class="diff-old">discard cache and abort the update process, optionally alerting the user to the failure. Otherwise, jump to the last step in</del> <ins class= "diff-chg">run</ins> the <del class="diff-old">overall set of</del> <a href="#cache0"><ins class="diff-chg">cache failure</ins> steps <del class="diff-old">of the update process.</del></a> . </li> <li> Otherwise, the fetching succeeded. Store the resource in the <var title="">new cache</var> . </li> <li> If the URI being processed was flagged as an "explicit entry" in <var title="">file list</var> , then <del class= "diff-old">categorise</del> <ins class="diff-chg">categorize</ins> the entry as an <a href="#explicit" title= "concept-appcache-explicit">explicit entry</a> . </li> <li> If the URI being processed was flagged as a "fallback entry" in <var title="">file list</var> , then <del class= "diff-old">categorise</del> <ins class="diff-chg">categorize</ins> the entry as a <a href="#fallback0" title= "concept-appcache-fallback">fallback entry</a> . </li> <li> If the URI being processed was flagged as a "opportunistic entry" in <var title="">file list</var> , then <del class= "diff-old">categorise</del> <ins class="diff-chg">categorize</ins> the entry as an <a href="#opportunistically" title= "concept-appcache-oppcache">opportunistically cached entry</a> . </li> <li> If the URI being processed was flagged as an "implicit entry" in <var title="">file list</var> , then <del class= "diff-old">categorise</del> <ins class="diff-chg">categorize</ins> the entry as a <a href="#implicit" title= "concept-appcache-implicit">implicit entry</a> . </li> <li> If the URI being processed was flagged as an "dynamic entry" in <var title="">file list</var> , then <del class= "diff-old">categorise</del> <ins class="diff-chg">categorize</ins> the entry as a <a href="#dynamic3" title= "concept-appcache-dynamic">dynamic entry</a> . </li> </ol> </li> <li> Store <var title="">manifest</var> in <var title="">new cache</var> , if it's not there already, and <del class= "diff-old">categorise</del> <ins class="diff-chg">categorize</ins> this entry (whether newly added or not) as <a href="#the-manifest" title="concept-appcache-manifest">the manifest</a> . </li> <li> Store the list of <a href="#opportunistic" title= "concept-appcache-oppcache-ns">opportunistic caching namespaces</a> , and the URIs of the <a href="#fallback0" title= "concept-appcache-fallback">fallback entries</a> that they map to, in the new cache. </li> <li> Store the URIs that form the new <a href="#online" title= "concept-appcache-onlinewhitelist">online whitelist</a> in the new cache. </li> <li> <ins class="diff-new">Wait for all pending downloads of</ins> <ins class="diff-new">implicit entries</ins> <ins class="diff-new">that are being stored in the cache to have completed.</ins> <ins class="diff-new">For example, if the</ins> <a href="#top-level"><ins class="diff-new">top-level browsing context</ins></a> <ins class="diff-new">'s</ins> <a href= "#active"><ins class="diff-new">active document</ins></a> <ins class="diff-new">isn't itself listed in the cache manifest, then it might still be being downloaded.</ins> <ins class="diff-new">If any of these downloads fail (e.g. the server returns a 4xx or 5xx response or equivalent, or there is a DNS error, or the connection times out, or the user cancels the download), then run the</ins> <a href="#cache0"><ins class= "diff-new">cache failure steps</ins></a> . </li> <li> If this is a <a href="#cache" title= "concept-appcache-cache">cache attempt</a> , then: <del class="diff-old">Set the status of cache group to idle .</del> Associate any <code>Document</code> objects that were <a href= "#flagAsCandidateForCache">flagged as candidates</a> for this manifest URI's caches with <var title="">cache</var> . <a href="#firing2">Fire a simple event</a> called <code title= "event-cached">cached</code> at the <code><a href= "#applicationcache">ApplicationCache</a></code> singleton of each <a href="#top-level">top-level browsing context</a> that is associated with a cache in <var title="">cache group</var> . The default action of this event should be the display of some sort of user interface indicating to the user that the application has been cached and that they can now use it offline. <del class="diff-old">Otherwise, this is an upgrade attempt :</del> Set the <a href="#update0" title= "concept-appcache-status">status</a> of <var title="">cache group</var> to idle . </li> <li> <ins class="diff-new">Otherwise, this is an</ins> <a href= "#upgrade" title="concept-appcache-upgrade"><ins class= "diff-new">upgrade attempt</ins></a> : <a href="#firing2">Fire a simple event</a> called <code title= "event-updateready">updateready</code> at the <code><a href= "#applicationcache">ApplicationCache</a></code> singleton of each <a href="#top-level">top-level browsing context</a> that is associated with a cache in <var title="">cache group</var> . The default action of this event should be the display of some sort of user interface indicating to the user that a new version is available and that they can activate it by reloading the page. <del class="diff-old">Abort these steps.</del> <ins class= "diff-chg">Set the</ins> <a href="#update0" title= "concept-appcache-status"><ins class="diff-chg">status</ins></a> <ins class="diff-chg">of</ins> <var title=""><ins class= "diff-chg">cache group</ins></var> <ins class="diff-chg">to</ins> <ins class="diff-chg">idle</ins> . </li> </ol> The <del class="diff-old">following step</del> <dfn id= "cache0"><ins class="diff-chg">cache failure steps</ins></dfn> <ins class="diff-chg">are as follows:</ins> <ol> <li> <a href="#firing2"><ins class="diff-chg">Fire a simple event</ins></a> <ins class="diff-chg">called</ins> <code title= "event-error"><a href="#error1"><ins class= "diff-chg">error</ins></a></code> <ins class="diff-chg">at the</ins> <code><a href="#applicationcache"><ins class= "diff-chg">ApplicationCache</ins></a></code> <ins class= "diff-chg">singleton of each</ins> <a href="#top-level"><ins class= "diff-chg">top-level browsing context</ins></a> <ins class= "diff-chg">that</ins> is <del class="diff-old">jumped to by various parts</del> <ins class="diff-chg">associated with a cache in</ins> <var title=""><ins class="diff-chg">cache group</ins></var> .<ins class="diff-chg">The default action</ins> of <ins class= "diff-new">this event should be</ins> the <del class= "diff-old">algorithm above when they have</del> <ins class= "diff-chg">display of some sort of user interface indicating</ins> to <del class="diff-old">cancel</del> the <del class= "diff-old">update.</del> <ins class="diff-chg">user that the user agent failed to save the application for offline use.</ins> </li> <li> <del class="diff-old">Let</del> <ins class="diff-chg">If this is a</ins> <a href="#cache" title="concept-appcache-cache"><ins class= "diff-chg">cache attempt</ins></a> ,<ins class="diff-chg">then discard</ins> <var title=""><ins class="diff-chg">cache</ins></var> <ins class="diff-chg">and abort the update process.</ins> </li> <li> <ins class="diff-chg">Otherwise, let</ins> the <a href= "#update0" title="concept-appcache-status">status</a> of the group of caches to which <var title="">cache</var> belongs be idle . If appropriate, remove any user interface indicating that an update for this cache is in progress. <ins class="diff-new">Abort the update process.</ins> </li> </ol> <h4 id="processing2"><del class= "diff-old">4.6.5.</del> <ins class="diff-chg">4.7.5</ins> Processing model</h4> The processing model of application caches for offline support in Web applications is part of the <a href="#navigate" title= "navigate">navigation</a> model, but references the algorithms defined in this section. A URI <dfn id="matches" title= "concept-appcache-matches-oppcache">matches an opportunistic caching namespace</dfn> if there exists an <a href= "#application0">application cache</a> whose <a href="#the-manifest" title="concept-appcache-manifest">manifest</a> 's URI has the <a href="#same-origin">same <del class= "diff-old">scheme/host/port</del> <ins class= "diff-chg">origin</ins></a> as the URI in question, and if that application cache has an <a href="#opportunistic" title= "concept-appcache-oppcache-ns">opportunistic caching namespace</a> with a <path> component that exactly matches the start of the <path> component of the URI being examined. If multiple opportunistic caching namespaces match the same URI, the one with the longest <path> component is the one that matches. A URI looking for an opportunistic caching namespace can match more than one application cache at a time, but only matches one namespace in each cache. <div class="example"> If a manifest <code title= "">http://example.com/app1/manifest</code> declares that <code title="">http://example.com/resources/images</code> should be opportunistically cached, and the user navigates to <code title= "">http://example.com/resources/images/cat.png</code> , then the user agent will decide that the application cache identified by <code title="">http://example.com/app1/manifest</code> contains a namespace with a match for that URI. </div> When the <dfn id="application2" title= "concept-appcache-init-with-attribute">application cache selection algorithm</dfn> algorithm is invoked with a manifest URI, the user agent must run the first applicable set of steps from the following list: <dl class="switch"> <dt>If the resource is not being loaded as part of navigation of a <a href="#top-level">top-level browsing context</a></dt> <dd> As an <del class="diff-old">optimisation,</del> <ins class= "diff-chg">optimization,</ins> if the resource was loaded from an <a href="#application0">application cache</a> , and the manifest URI of that cache doesn't match the manifest URI with which the algorithm was invoked, then the user agent should mark the entry in that application cache corresponding to the resource that was just loaded as being <a href="#foreign" title= "concept-appcache-foreign">foreign</a> . Other than that, nothing special happens with respect to application caches. </dd> <dt>If the resource being loaded was loaded from an application cache and the URI of that application cache's manifest is the same as the manifest URI with which the algorithm was invoked</dt> <dd> Associate the <code>Document</code> with the cache from which it was loaded. Invoke the <a href="#application1">application cache update process</a> . </dd> <dt>If the resource being loaded was loaded from an application cache and the URI of that application cache's manifest is not the same as the manifest URI with which the algorithm was invoked</dt> <dd> Mark the entry for this resource in the application cache from which it was loaded as <a href="#foreign" title= "concept-appcache-foreign">foreign</a> . Restart the current navigation from the top of the <a href= "#navigate" title="navigate">navigation algorithm</a> , undoing any changes that were made as part of the initial load (changes can be avoided by ensuring that the step to <a href="#update2">update the session history with the new page</a> is only ever completed after the application cache selection algorithm is run, though this is not required). The navigation will not result in the same resource being loaded, because "foreign" entries are never picked during navigation. User agents may notify the user of the inconsistency between the cache manifest and the resource's own metadata, to aid in application development. </dd> <dt>If the resource being loaded was not loaded from an application cache, but it was loaded using HTTP GET or equivalent</dt> <dd> <ol> <li> If the manifest URI does not have the <a href= "#same-origin">same <del class="diff-old">scheme/host/port</del> <ins class="diff-chg">origin</ins></a> as the resource's own URI, then invoke the <a href="#application3" title= "concept-appcache-init-no-attribute">application cache selection algorithm</a> again, but without a manifest, and abort these steps. </li> <li> If there is already an <a href="#application0">application cache</a> identified by this manifest URI, and <ins class= "diff-new">the most up to date version of</ins> that <a href= "#application0">application cache</a> contains a resource with the URI of the manifest, and that resource is <del class= "diff-old">categorised</del> <ins class= "diff-chg">categorized</ins> as a <a href="#the-manifest" title= "concept-appcache-manifest">manifest</a> , then: store the resource in the matching <del class="diff-old">cache with the most up to date version, categorised</del> <ins class="diff-chg">cache, categorized</ins> as an <a href="#implicit" title= "concept-appcache-implicit">implicit entry</a> , associate the <code>Document</code> with that cache, invoke the <a href= "#application1">application cache update process</a> , and abort these steps. </li> <li id="flagAsCandidateForCache"> Flag the resource's <code>Document</code> as a candidate for this manifest URI's <del class="diff-old">caches.</del> <ins class= "diff-chg">caches, so that it will be</ins> <a href= "#flagAsCandidateForCache-result"><ins class="diff-chg">associated with an application cache identified by this manifest URI</ins></a> <ins class="diff-chg">later, when such an</ins> <a href= "#application0"><ins class="diff-chg">application cache</ins></a> <ins class="diff-chg">is ready.</ins> </li> <li> If there is already an <a href="#application0">application cache</a> identified by this manifest URI, then <ins class= "diff-new">the most up to date version of</ins> that <a href= "#application0">application cache</a> does not yet contain a resource with the URI of the manifest, or it does but that resource is not yet <del class="diff-old">categorised</del> <ins class= "diff-chg">categorized</ins> as a <a href="#the-manifest" title= "concept-appcache-manifest">manifest</a> : store the resource in that cache, <del class="diff-old">categorised</del> <ins class= "diff-chg">categorized</ins> as an <a href="#implicit" title= "concept-appcache-implicit">implicit entry</a> (replacing the file's previous contents if it was already in the cache, but not removing any other categories it might have), and abort these steps. <ins class="diff-new">(An</ins> <a href= "#application1"><ins class="diff-new">application cache update process</ins></a> <ins class="diff-new">is already in progress.)</ins> </li> <li> Otherwise, there is no matching <a href= "#application0">application cache</a> : create a new application cache identified by this manifest URI, store the resource in that cache, <del class="diff-old">categorised</del> <ins class= "diff-chg">categorized</ins> as an <a href="#implicit" title= "concept-appcache-implicit">implicit entry</a> , and then invoke the <a href="#application1">application cache update process</a> . </li> </ol> </dd> <dt>Otherwise</dt> <dd> Invoke the <a href="#application3" title= "concept-appcache-init-no-attribute">application cache selection algorithm</a> again, but without a manifest. </dd> </dl> When the <dfn id="application3" title= "concept-appcache-init-no-attribute">application cache selection algorithm</dfn> is invoked without a manifest, then: if the resource is being loaded as part of navigation of a <a href= "#top-level">top-level browsing context</a> , and the resource was fetched from a particular <a href="#application0">application cache</a> , then the user agent must associate the <code>Document</code> with that application cache and invoke the <a href="#application1">application cache update process</a> for that cache; otherwise, nothing special happens with respect to application caches. <h5 id="changes"><del class= "diff-old">4.6.5.1.</del> <ins class= "diff-chg">4.7.5.1.</ins> Changes to the networking model</h5> When a browsing context is associated with an <a href= "#application0">application cache</a> , any and all resource loads must go through the following steps instead of immediately invoking the mechanisms appropriate to that resource's scheme: <ol> <li> If the resource is not to be fetched using the HTTP GET mechanism or equivalent, then fetch the resource normally and abort these steps. </li> <li> If the resource's URI, ignoring its fragment identifier if any, is listed in the <a href="#application0">application cache</a> 's <a href="#online" title="concept-appcache-onlinewhitelist">online whitelist</a> , then fetch the resource normally and abort these steps. </li> <li> If the resource's URI is <a href="#implicit" title= "concept-appcache-implicit">an implicit entry</a> , <a href= "#the-manifest" title="concept-appcache-manifest">the manifest</a> , <a href="#explicit" title="concept-appcache-explicit">an explicit entry</a> , <a href="#fallback0" title= "concept-appcache-fallback">a fallback entry</a> , <a href= "#opportunistically" title="concept-appcache-oppcache">an opportunistically cached entry</a> , or a <a href="#dynamic3" title="concept-appcache-dynamic">dynamic entry</a> in the <a href= "#application0">application cache</a> , then fetch the resource from the cache and abort these steps. </li> <li> If the resource's URI has the <a href="#same-origin">same <del class="diff-old">scheme/host/port</del> <ins class= "diff-chg">origin</ins></a> as the manifest's URI, and the start of the resource's URI's <path> component is exactly matched by the <path> component of an <a href="#opportunistic" title= "concept-appcache-oppcache-ns">opportunistic caching namespace</a> in the <a href="#application0">application cache</a> , then: Fetch the resource normally. If this results 4xx or 5xx status codes or equivalent, or if there were network <del class= "diff-old">errors,</del> <ins class="diff-chg">errors (but not if the user canceled the download),</ins> then instead fetch, from the cache, the resource of the <a href="#fallback0" title= "concept-appcache-fallback">fallback entry</a> corresponding to the namespace with the longest matching <path> component. Abort these steps. </li> <li> Fail the resource load. </li> </ol> The above algorithm ensures that resources that are not present in the manifest will always fail to load (at least, after the cache has been primed the first time), making the testing of offline applications simpler. <h4 id="application"><del class= "diff-old">4.6.6.</del> <ins class="diff-chg">4.7.6</ins> Application cache API</h4> <pre class="idl"> interface <dfn id="applicationcache">ApplicationCache</dfn> { // <a href="#update0" title= "concept-appcache-status">update status</a> const unsigned short <a href="#uncached" title= "dom-appcache-UNCACHED">UNCACHED</a> = 0; const unsigned short <a href="#idle" title= "dom-appcache-IDLE">IDLE</a> = 1; const unsigned short <a href="#checking" title= "dom-appcache-CHECKING">CHECKING</a> = 2; const unsigned short <a href="#downloading" title= "dom-appcache-DOWNLOADING">DOWNLOADING</a> = 3; const unsigned short <a href="#updateready" title= "dom-appcache-UPDATEREADY">UPDATEREADY</a> = 4; readonly attribute unsigned short <a href="#status0" title= "dom-appcache-status">status</a>; // updates void <a href="#update1" title="dom-appcache-update">update</a>(); void <a href="#swapcache" title= "dom-appcache-swapCache">swapCache</a>(); // dynamic entries <del class="diff-old"> readonly attribute unsigned long ; </del> <ins class="diff-chg"> readonly attribute unsigned long <a href= "#length7" title="dom-appcache-length">length</a>; </ins> DOMString <a href="#itemindex4" title= "dom-appcache-item">item</a>(in unsigned long index); void <a href="#adduri" title= "dom-appcache-add">add</a>(in DOMString uri); void <a href="#remove1" title= "dom-appcache-remove">remove</a>(in DOMString uri); // events attribute EventListener <a href= "#onchecking" title="handler-appcache-onchecking">onchecking</a>; attribute EventListener <a href="#onerror0" title="handler-appcache-onerror">onerror</a>; attribute EventListener <a href= "#onnoupdate" title="handler-appcache-onnoupdate">onnoupdate</a>; attribute EventListener <a href= "#ondownloading" title= "handler-appcache-ondownloading">ondownloading</a>; attribute EventListener <a href= "#onprogress" title="handler-appcache-onprogress">onprogress</a>; attribute EventListener <a href= "#onupdateready" title= "handler-appcache-onupdateready">onupdateready</a>; attribute EventListener <a href="#oncached" title="handler-appcache-oncached">oncached</a>; }; </pre> Objects implementing the <code><a href= "#applicationcache">ApplicationCache</a></code> interface must also implement the <code>EventTarget</code> interface. There is a one-to-one mapping from <code>Document</code> objects to <code><a href="#applicationcache">ApplicationCache</a></code> objects. The <dfn id="applicationcache0" title= "dom-applicationCache"><code>applicationCache</code></dfn> attribute on <code><a href="#window">Window</a></code> objects must return the <code><a href= "#applicationcache">ApplicationCache</a></code> object associated with the <a href="#active">active document</a> of the <code><a href="#window">Window</a></code> 's <a href= "#browsing1">browsing context</a> . An <code><a href="#applicationcache">ApplicationCache</a></code> object might be associated with an <a href= "#application0">application cache</a> . When the <code>Document</code> object that the <code><a href= "#applicationcache">ApplicationCache</a></code> object maps to is associated with an application cache, then that is the application cache with which the <code><a href= "#applicationcache">ApplicationCache</a></code> object is associated. Otherwise, the <code><a href= "#applicationcache">ApplicationCache</a></code> object is associated with the application cache that the <code>Document</code> object's <a href="#browsing1">browsing context</a> is associated with, if any. The <dfn id="status0" title= "dom-appcache-status"><code>status</code></dfn> attribute, on getting, must return the current state of the <a href= "#application0">application cache</a> <code><a href= "#applicationcache">ApplicationCache</a></code> object is associated with, if any. This must be the appropriate value from the following list: <dl> <dt><dfn id="uncached" title= "dom-appcache-UNCACHED"><code>UNCACHED</code></dfn> (numeric value 0)</dt> <dd> The <code><a href= "#applicationcache">ApplicationCache</a></code> object is not associated with an <a href="#application0">application cache</a> at this time. </dd> <dt><dfn id="idle" title= "dom-appcache-IDLE"><code>IDLE</code></dfn> (numeric value 1)</dt> <dd> The <code><a href= "#applicationcache">ApplicationCache</a></code> object is associated with an <a href="#application0">application cache</a> whose group is in the idle update status , and that application cache is the newest cache in its group that contains a resource <del class="diff-old">categorised</del> <ins class= "diff-chg">categorized</ins> as a <a href="#the-manifest" title= "concept-appcache-manifest">manifest</a> . </dd> <dt><dfn id="checking" title= "dom-appcache-CHECKING"><code>CHECKING</code></dfn> (numeric value 2)</dt> <dd> The <code><a href= "#applicationcache">ApplicationCache</a></code> object is associated with an <a href="#application0">application cache</a> whose group is in the checking update status . </dd> <dt><dfn id="downloading" title= "dom-appcache-DOWNLOADING"><code>DOWNLOADING</code></dfn> (numeric value 3)</dt> <dd> The <code><a href= "#applicationcache">ApplicationCache</a></code> object is associated with an <a href="#application0">application cache</a> whose group is in the downloading update status . </dd> <dt><dfn id="updateready" title= "dom-appcache-UPDATEREADY"><code>UPDATEREADY</code></dfn> (numeric value 4)</dt> <dd> The <code><a href= "#applicationcache">ApplicationCache</a></code> object is associated with an <a href="#application0">application cache</a> whose group is in the idle update status , but that application cache is not the newest cache in its group that contains a resource <del class="diff-old">categorised</del> <ins class="diff-chg">categorized</ins> as a <a href= "#the-manifest" title="concept-appcache-manifest">manifest</a> . </dd> </dl> The <dfn id="length7" title= "dom-appcache-length"><code>length</code></dfn> attribute must return the number of <a href="#dynamic3" title= "concept-appcache-dynamic">dynamic entries</a> in the <a href= "#application0">application cache</a> with which the <code><a href= "#applicationcache">ApplicationCache</a></code> object is associated, if any, and zero if the object is not associated with any application cache. The <a href="#dynamic3" title="concept-appcache-dynamic">dynamic entries</a> in the <a href="#application0">application cache</a> are ordered in the same order as they were added to the cache by the <code title="dom-appcache-add"><a href= "#adduri">add()</a></code> method, with the oldest entry being the zeroth entry, and the most recently added entry having the index <code title="dom-appcache-length"><a href= "#length7">length</a></code> -1 . The <dfn id="itemindex4" title="dom-appcache-item"><code>item( <var title="">index</var> )</code></dfn> method must return the <ins class="diff-new">absolute URI of the</ins> <a href="#dynamic3" title="concept-appcache-dynamic">dynamic <del class= "diff-old">entries</del> <ins class="diff-chg">entry</ins></a> with index <var title="">index</var> from the <a href= "#application0">application cache</a> , if one is associated with the <code><a href="#applicationcache">ApplicationCache</a></code> object. If the object is not associated with any application cache, or if the <var title="">index</var> argument is lower than zero or greater than <code title="dom-appcache-length"><a href= "#length7">length</a></code> -1 , the method must instead raise an <code>INDEX_SIZE_ERR</code> exception. The <dfn id="adduri" title="dom-appcache-add"><code>add( <var title="">uri</var> )</code></dfn> method must run the following steps: <ol> <li> If the <code><a href= "#applicationcache">ApplicationCache</a></code> object is not associated with any application cache, then raise an <code>INVALID_STATE_ERR</code> exception and abort these steps. </li> <li> If <var title=""><ins class="diff-new">uri</ins></var> <ins class="diff-new">is not a valid URI reference, then raise a</ins> <code><ins class="diff-new">SYNTAX_ERR</ins></code> <ins class="diff-new">exception and abort these steps.</ins> <a href="#references"><ins class="diff-new">[RFC3986]</ins></a> <a href="#references"><ins class="diff-new">[RFC3987]</ins></a> </li> <li> <ins class="diff-new">resolve relative URIs; on failure, raise a</ins> <code><ins class= "diff-new">SYNTAX_ERR</ins></code> <ins class= "diff-new">exception</ins> </li> <li> <ins class="diff-new">If</ins> there is already a resource in in the <a href="#application0">application cache</a> with which the <code><a href="#applicationcache">ApplicationCache</a></code> object is associated that has the address <var title="">uri</var> , then ensure that entry is <del class="diff-old">categorised</del> <ins class="diff-chg">categorized</ins> as a <a href="#dynamic3" title="concept-appcache-dynamic">dynamic entry</a> and return and abort these steps. </li> <li> If <var title="">uri</var> has a different <scheme> component than the manifest's URI, then raise a <a href= "#security9">security exception</a> . </li> <li> Return, but do not abort these steps. </li> <li> Fetch the resource referenced by <var title="">uri</var> . </li> <li> If this results 4xx or 5xx status codes or equivalent, or if there were network errors, <ins class="diff-new">or if the user canceled the download,</ins> then abort these steps. </li> <li> Wait for there to be no running scripts, or at least no running scripts that can reach an <code><a href= "#applicationcache">ApplicationCache</a></code> object associated with the <a href="#application0">application cache</a> with which this <code><a href="#applicationcache">ApplicationCache</a></code> object is associated. Add the fetched resource to the <a href= "#application0">application cache</a> and <del class= "diff-old">categorise</del> <ins class="diff-chg">categorize</ins> it as a <a href="#dynamic3" title= "concept-appcache-dynamic">dynamic entry</a> before letting any such scripts resume. </li> </ol> We can make the add() API more usable (i.e. make it possible to detect progress and distinguish success from errors without polling and timeouts) if we have the method return an object that is a target of Progress Events, much like the <a href= "http://dev.w3.org/cvsweb/~checkout~/2006/webapi/XMLHttpRequest-2/Overview.html?content-type=text/html;%20charset=utf-8#xmlhttprequesteventtarget-interface"> XMLHttpRequestEventTarget</a> interface. This would also make this far more complex to spec and implement. The <dfn id="remove1" title="dom-appcache-remove"><code>remove( <var title="">uri</var> )</code></dfn> method must remove the <a href="#dynamic3" title="concept-appcache-dynamic">dynamic entry</a> <del class="diff-old">categorisation</del> <ins class= "diff-chg">categorization</ins> of any entry with the address <var title="">uri</var> in the <a href="#application0">application cache</a> with which the <code><a href= "#applicationcache">ApplicationCache</a></code> object is associated. <ins class="diff-new">Resolve relative URIs... (ignore syntax errors)</ins> If this removes the last <del class="diff-old">categorisation</del> <ins class="diff-chg">categorization</ins> of an entry in that cache, then the entry must be removed entirely (such that if it is re-added, it will be loaded from the network again). If the <code><a href="#applicationcache">ApplicationCache</a></code> object is not associated with any application cache, then the method must raise an <code>INVALID_STATE_ERR</code> exception instead. If the <dfn id="update1" title= "dom-appcache-update"><code>update()</code></dfn> method is invoked, the user agent must invoke the <a href= "#application1">application cache update process</a> , in the background, for the <a href="#application0">application cache</a> with which the <code><a href= "#applicationcache">ApplicationCache</a></code> object is associated. If there is no such application cache, then the method must raise an <code>INVALID_STATE_ERR</code> exception instead. If the <dfn id="swapcache" title= "dom-appcache-swapCache"><code>swapCache()</code></dfn> method is invoked, the user agent must run the following steps: <ol> <li> Let <var title="">document</var> be the <code>Document</code> with which the <code><a href= "#applicationcache">ApplicationCache</a></code> object is associated. </li> <li> Check that <var title="">document</var> is associated with an <a href="#application0">application cache</a> . If it is not, then raise an <code>INVALID_STATE_ERR</code> exception and abort these steps. This is not the same thing as the <code><a href= "#applicationcache">ApplicationCache</a></code> object being itself associated with an <a href="#application0">application cache</a> ! In particular, the <code>Document</code> with which the <code><a href="#applicationcache">ApplicationCache</a></code> object is associated can only itself be associated with an application cache if it is in a <a href="#top-level">top-level browsing context</a> . </li> <li> Let <var title="">cache</var> be the <a href= "#application0">application cache</a> with which the <code><a href= "#applicationcache">ApplicationCache</a></code> object is associated. (By definition, this is the same as the one that was found in the previous step.) </li> <li> Check that there is an application cache in the same group as <var title="">cache</var> which has an entry <del class= "diff-old">categorised</del> <ins class= "diff-chg">categorized</ins> as a <a href="#the-manifest" title= "concept-appcache-manifest">manifest</a> that has is newer than <var title="">cache</var> . If there is not, then raise an <code>INVALID_STATE_ERR</code> exception and abort these steps. </li> <li> Let <var title="">new cache</var> be the newest <a href= "#application0">application cache</a> in the same group as <var title="">cache</var> which has an entry <del class= "diff-old">categorised</del> <ins class= "diff-chg">categorized</ins> as a <a href="#the-manifest" title= "concept-appcache-manifest">manifest</a> . </li> <li> Unassociate <var title="">document</var> from <var title= "">cache</var> and instead associate it with <var title="">new cache</var> . </li> </ol> The following are the <a href="#event4">event handler DOM attributes</a> that must be supported by objects implementing the <code><a href="#applicationcache">ApplicationCache</a></code> interface: <dl> <dt><dfn id="onchecking" title= "handler-appcache-onchecking"><code>onchecking</code></dfn></dt> <dd> Must be invoked whenever an <code title= "event-checking">checking</code> event is targeted at or bubbles through the <code><a href= "#applicationcache">ApplicationCache</a></code> object. </dd> <dt><dfn id="onerror0" title= "handler-appcache-onerror"><code>onerror</code></dfn></dt> <dd> Must be invoked whenever an <code title="event-error"><a href= "#error1">error</a></code> event is targeted at or bubbles through the <code><a href="#applicationcache">ApplicationCache</a></code> object. </dd> <dt><dfn id="onnoupdate" title= "handler-appcache-onnoupdate"><code>onnoupdate</code></dfn></dt> <dd> Must be invoked whenever an <code title= "event-noupdate">noupdate</code> event is targeted at or bubbles through the <code><a href= "#applicationcache">ApplicationCache</a></code> object. </dd> <dt><dfn id="ondownloading" title= "handler-appcache-ondownloading"><code>ondownloading</code></dfn></dt> <dd> Must be invoked whenever an <code title= "event-downloading">downloading</code> event is targeted at or bubbles through the <code><a href= "#applicationcache">ApplicationCache</a></code> object. </dd> <dt><dfn id="onprogress" title= "handler-appcache-onprogress"><code>onprogress</code></dfn></dt> <dd> Must be invoked whenever an <code title= "event-progress"><a href="#progress0">progress</a></code> event is targeted at or bubbles through the <code><a href= "#applicationcache">ApplicationCache</a></code> object. </dd> <dt><dfn id="onupdateready" title= "handler-appcache-onupdateready"><code>onupdateready</code></dfn></dt> <dd> Must be invoked whenever an <code title= "event-updateready">updateready</code> event is targeted at or bubbles through the <code><a href= "#applicationcache">ApplicationCache</a></code> object. </dd> <dt><dfn id="oncached" title= "handler-appcache-oncached"><code>oncached</code></dfn></dt> <dd> Must be invoked whenever a <code title= "event-cached">cached</code> event is targeted at or bubbles through the <code><a href= "#applicationcache">ApplicationCache</a></code> object. </dd> </dl> <h4 id="browser0"><del class= "diff-old">4.6.7.</del> <ins class="diff-chg">4.7.7</ins> Browser state</h4> The <dfn id="navigator.online" title= "dom-navigator-onLine"><code>navigator.onLine</code></dfn> attribute must return false if the user agent will not contact the network when the user follows links or when a script requests a remote page (or knows that such an attempt would fail), and must return true otherwise. When the value that would be returned by the <code title= "dom-navigator-onLine"><a href= "#navigator.online">navigator.onLine</a></code> attribute of the <code><a href="#window">Window</a></code> changes from true to false, the user agent must <a href="#firing2">fire a simple event</a> called <dfn id="offline0" title= "event-offline"><code>offline</code></dfn> at <a href= "#the-body1">the body element</a> . On the other hand, when the value that would be returned by the <code title="dom-navigator-onLine"><a href= "#navigator.online">navigator.onLine</a></code> attribute of the <code><a href="#window">Window</a></code> changes from false to true, the user agent must <a href="#firing2">fire a simple event</a> called <dfn id="online0" title= "event-online"><code>online</code></dfn> at <a href= "#the-body1">the body element</a> . <h3 id="history"><del class= "diff-old">4.7.</del> <ins class="diff-chg">4.8</ins> Session history and navigation</h3> <h4 id="the-session"><del class= "diff-old">4.7.1.</del> <ins class="diff-chg">4.8.1</ins> The session history of browsing contexts</h4> The sequence of <code>Document</code> s in a <a href= "#browsing1">browsing context</a> is its <dfn id="session">session history</dfn> . <code><a href="#history2">History</a></code> objects provide a representation of the pages in the session history of <a href= "#browsing1" title="browsing context">browsing contexts</a> . Each browsing context has a distinct session history. Each <code>Document</code> object in a browsing context's session history is associated with a unique instance of the <code><a href="#history2">History</a></code> object, although they all must model the same underlying session history. The <dfn id="history1" title= "dom-history"><code>history</code></dfn> attribute of the <code><a href="#window">Window</a></code> interface must return the object implementing the <code><a href= "#history2">History</a></code> interface for that <code><a href= "#window">Window</a></code> object's <a href="#active">active document</a> . <code><a href="#history2">History</a></code> objects represent their <a href="#browsing1">browsing context</a> 's session history as a flat list of <a href="#session0" title= "session history entry">session history entries</a> . Each <dfn id= "session0">session history entry</dfn> consists of either a URI or a <a href="#state">state object</a> , or both, and may in addition have a title, a <code>Document</code> object, form data, a scroll position, and other information associated with it. This does not imply that the user interface need be linear. See the <a href="#history-notes">notes below</a> . URIs without <del class="diff-old">assaciated</del> <ins class= "diff-chg">associated</ins> <a href="#state" title= "state object">state objects</a> are added to the session history as the user (or script) navigates from page to page. A <dfn id="state">state object</dfn> is an object representing a user interface state. Pages can <a href="#pushstate" title= "dom-history-pushState">add</a> <a href="#state" title= "state object">state objects</a> between their entry in the session history and the next ("forward") entry. These are then <a href= "#popstate" title="event-popstate">returned to the script</a> when the user (or script) goes back in the history, thus enabling authors to use the "navigation" metaphor even in one-page applications. <ins class="diff-new">Every</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">in the session history is defined to have a</ins> <dfn id= "last-activated"><ins class="diff-new">last activated entry</ins></dfn> ,<ins class="diff-new">which is the</ins> <a href="#state"><ins class="diff-new">state object</ins></a> <ins class="diff-new">entry associated with that</ins> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">which was most recently activated. Initially, the</ins> <a href="#last-activated"><ins class="diff-new">last activated entry</ins></a> <ins class="diff-new">of a</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">must be the first entry for the</ins> <code><ins class= "diff-new">Document</ins></code> ,<ins class= "diff-new">representing the fact that no</ins> <a href= "#state"><ins class="diff-new">state object</ins></a> <ins class= "diff-new">entry has yet been activated.</ins> At any point, one of the entries in the session history is the <dfn id="current1">current entry</dfn> . This is the entry representing the <a href="#active">active document</a> of the <a href="#browsing1">browsing context</a> . The <a href= "#current1">current entry</a> is usually an entry for the <a href= "#href5" title="dom-location-href">location</a> of the <code>Document</code> . However, it can also be one of the entries for <a href="#state" title="state object">state objects</a> added to the history by that document. Entries that consist of <a href="#state" title= "state object">state objects</a> share the same <code>Document</code> as the entry for the page that was active when they were added. Contiguous entries that differ just by fragment identifier also share the same <code>Document</code> . All entries that share the same <code>Document</code> (and that are therefore merely different states of one particular document) are contiguous by definition. User agents may <dfn id="discard">discard</dfn> the DOMs of entries other than the <a href="#current1">current entry</a> that are not referenced from any script, reloading the pages afresh when the user or script navigates back to such pages. This specification does not specify when user agents should discard pages' DOMs and when they should cache them. See the section on the <code title= "event-load"><a href="#load0">load</a></code> and <code title= "event-unload">unload</code> events for more details. Entries that have had their DOM discarded must, for the purposes of the algorithms given below, act as if they had not. When the user or script navigates back or forwards to a page which has no in-memory DOM objects, any other entries that shared the same <code>Document</code> object with it must share the new object as well. When state object entries are added, a URI can be provided. This URI is used to replace the state object entry if the <code>Document</code> is evicted. When a user agent discards the DOM from an entry in the session history, it must also discard all the entries that share that <code>Document</code> but do not have an associated URI (i.e. entries that only have a <a href="#state">state object</a> ). Entries that shared that <code>Document</code> object but had a state object and have a different URI must then have their state objects removed. Removed entries are not recreated if the user or script navigates back to the page. If there are no state object entries for that <code>Document</code> object then no entries are removed. <ins class="diff-new">when an entry is discarded, any frozen timers, intervals, XMLHttpRequests, database transactions, etc, must be killed</ins> <h4 id="the-history"><del class= "diff-old">4.7.2.</del> <ins class="diff-chg">4.8.2</ins> The <code><a href="#history2">History</a></code> interface</h4> <del class="diff-old">{ readonly attribute long ;</del> <pre class="idl"> interface <dfn id="history2">History</dfn> { <ins class="diff-chg"> readonly attribute long <a href="#length8" title="dom-history-length">length</a>; </ins> void <a href="#godelta" title= "dom-history-go">go</a>(in long delta); void <a href="#go" title="dom-history-go-0">go</a>(); void <a href="#back" title="dom-history-back">back</a>(); void <a href="#forward" title= "dom-history-forward">forward</a>(); void <a href="#pushstate" title= "dom-history-pushState">pushState</a>(in DOMObject data, in DOMString title); void <a href="#pushstate" title= "dom-history-pushState">pushState</a>(in DOMObject data, in DOMString title, in DOMString url); void <a href="#clearstate" title= "dom-history-clearState">clearState</a>(); }; </pre> The <dfn id="length8" title= "dom-history-length"><code>length</code></dfn> attribute of the <code><a href="#history2">History</a></code> interface must return the number of entries in this <a href="#session">session history</a> . The actual entries are not accessible from script. The <dfn id="godelta" title="dom-history-go"><code>go( <var title="">delta</var> )</code></dfn> method causes the UA to move the number of steps specified by <var title="">delta</var> in the session history. If the index of the <a href="#current1">current entry</a> plus <var title="">delta</var> is less than zero or greater than or equal to the <a href="#length8" title="dom-history-length">number of items in the session history</a> , then the user agent must do nothing. If the <var title="">delta</var> is zero, then the user agent must act as if the <code title= "dom-location-reload">location.reload()</code> method was called instead. Otherwise, the user agent must cause the current <a href= "#browsing1">browsing context</a> to <a href="#traverse">traverse the history</a> to the specified <del class="diff-old">entry, as described below.</del> <ins class="diff-chg">entry.</ins> The specified entry is the one whose index equals the index of the <a href="#current1">current entry</a> plus <var title= "">delta</var> . When <del class="diff-old">a user agent is required to traverse the history to a specified entry, the user agent must act as follows: If there is no longer a Document object for the entry in question, the user agent must navigate the browsing context to the location for that entry to preform an entry update of that entry, and abort these steps. The " navigate " algorithm reinvokes this "traverse" algorithm to complete the traversal, at which point there is a Document object and so this step gets skipped. If appropriate, update the current entry in the browsing context 's Document object's History object to reflect any state that the user agent wishes to persist. For example, some user agents might want to persist the scroll position, or the values of form controls. If there are any entries with state objects between the current entry and the specified entry (not inclusive), then the user agent must iterate through every entry between the current entry and the specified entry, starting with the entry closest to the current entry, and ending with the one closest to the specified entry. For each entry, if the entry is a state object, the user agent must activate the state object . If the specified entry has a different Document object than the current entry then the user agent must run the following substeps: The user agent must move any properties that have been added to the browsing context's default view's Window object to the active document 's Document 's list of added properties . If the browsing context is a top-level browsing context (and not an auxiliary browsing context ), and the origin of the Document of the specified entry is not the same as the origin of the Document of the current entry , then the following sub-sub-steps must be run: The current browsing context name must be stored with all the entries in the history that are associated with Document objects with the same origin as the active document and that are contiguous with the current entry . The browsing context's browsing context name must be unset. The user agent must make the specified entry 's Document object the active document of the browsing context . (If it is a top-level browsing context , this might change which application cache it is associated with.) If the specified entry has a browsing context name stored with it, then the following sub-sub-steps must be run: The browsing context's browsing context name must be set to the name stored with the specified entry. Any browsing context name stored with the entries in the history that are associated with Document objects with the same origin as the new active document , and that are contiguous with the specified entry, must be cleared. The user agent must move any properties that have been added to the active document 's Document 's list of added properties to browsing context's default view's Window object. If the specified entry is a state object, the user agent must activate that state object . If the specified entry has a URI that differs from the current entry 's only by its fragment identifier, and the two share the same Document object, then fire a simple event with the name hashchanged at the body element , and, if the new URI has a fragment identifier, scroll to the fragment identifier . User agents may also update other aspects of the document view when the location changes in this way, for instance the scroll position, values of form fields, etc. The current entry is now the specified entry . how does the changing of the global attributes affect .watch() when seen from other Windows? When</del> the user navigates through a <a href="#browsing1">browsing context</a> , e.g. using a browser's back and forward buttons, the user agent must translate this action into the equivalent invocations of the <code title= "dom-history-go"><a href="#godelta">history.go( <var title= "">delta</var> )</a></code> method on the various affected <code title="dom-window"><a href="#window0">window</a></code> objects. Some of the other members of the <code><a href= "#history2">History</a></code> interface are defined in terms of the <code title="dom-history-go"><a href="#godelta">go()</a></code> method, as follows: <table> <tbody> <tr> <th>Member</th> <th>Definition</th> </tr> <tr> <td><dfn id="go" title= "dom-history-go-0"><code>go()</code></dfn></td> <td>Must do the same as <code title="dom-history-go"><a href= "#godelta">go(0)</a></code></td> </tr> <tr> <td><dfn id="back" title= "dom-history-back"><code>back()</code></dfn></td> <td>Must do the same as <code title="dom-history-go"><a href= "#godelta">go(-1)</a></code></td> </tr> <tr> <td><dfn id="forward" title= "dom-history-forward"><code>forward()</code></dfn></td> <td>Must do the same as <code title="dom-history-go"><a href= "#godelta">go(1)</a></code></td> </tr> </tbody> </table> The <dfn id="pushstate" title= "dom-history-pushState"><code>pushState( <var title="">data</var> , <var title="">title</var> , <var title="">url</var> )</code></dfn> method adds a state object to the history. When this method is invoked, the user agent must first check the third argument. If a third argument is specified, then the user agent must verify that the third argument is a valid URI or IRI (as defined by RFC 3986 and 3987), and if so, that, after resolving it to an absolute URI, it is either identical to the document's URI, or that it differs from the document's URI only in the <query>, <abs_path>, and/or <fragment> parts, as applicable (the <query> and <abs_path> parts can only be the same if the document's URI uses a hierarchical <scheme>). If the verification fails (either because the argument is syntactically incorrect, or differs in a way not described as acceptable in the previous sentence) then the user agent must raise a <a href="#security9">security exception</a> . <a href="#references">[RFC3986]</a> <a href= "#references">[RFC3987]</a> If the third argument passes its verification step, or if the third argument was omitted, then the user agent must remove from the <a href="#session">session history</a> any entries for that <code>Document</code> from the entry after the <a href= "#current1">current entry</a> up to the last entry in the session history that references the same <code>Document</code> object, if any. If the <a href="#current1">current entry</a> is the last entry in the session history, or if there are no entries after the <a href="#current1">current entry</a> that reference the same <code>Document</code> object, then no entries are removed. Then, the user agent must add a state object entry to the session history, after the <a href="#current1">current entry</a> , with the specified <var title="">data</var> as the state object, the given <var title="">title</var> as the title, and, if the third argument is present, the given <var title="">url</var> as the URI of the entry. <ins class="diff-new">Then, the user agent must set this new entry as being the</ins> <a href="#last-activated"><ins class= "diff-new">last activated entry</ins></a> <ins class="diff-new">for the</ins> <code><ins class="diff-new">Document</ins></code> . Finally, the user agent must update the <a href= "#current1">current entry</a> to be the this newly added entry. The <var title="">title</var> is purely advisory. User agents might use the title in the user interface. User agents may limit the number of state objects added to the session history per page. If a page hits the UA-defined limit, user agents must remove the entry immediately after the first entry for that <code>Document</code> object in the session history after having added the new entry. (Thus the state history acts as a FIFO buffer for eviction, but as a LIFO buffer for navigation.) The <dfn id="clearstate" title= "dom-history-clearState"><code>clearState()</code></dfn> method removes all the state objects for the <code>Document</code> object from the session history. When this method is invoked, the user agent must remove from the session history all the entries from the first state object entry for that <code>Document</code> object up to the last entry that references that same <code>Document</code> object, if any. Then, if the <a href="#current1">current entry</a> was removed in the previous step, the <a href="#current1">current entry</a> must be set to the last entry for that <code>Document</code> object in the session history. <h4 id="activating"><del class= "diff-old">4.7.3.</del> <ins class="diff-chg">4.8.3</ins> <dfn id="activating0" title="activate the state object">Activating state <del class="diff-old">objects</del> <ins class= "diff-chg">object entries</ins></dfn></h4> When <del class="diff-old">a state object</del> <ins class= "diff-chg">an entry</ins> in the session history is activated (which happens <del class="diff-old">in the cases</del> <ins class= "diff-chg">during</ins> <a href="#traverse" title= "traverse the history"><ins class="diff-chg">session traversal</ins></a> ,<ins class="diff-chg">as</ins> described above), the user agent must <ins class="diff-new">run the following steps:</ins> <ol> <li> <ins class="diff-new">First, the user agent must set this new entry as being the</ins> <a href="#last-activated"><ins class= "diff-new">last activated entry</ins></a> <ins class="diff-new">for the</ins> <code><ins class="diff-new">Document</ins></code> <ins class="diff-new">to which the entry belongs.</ins> </li> <li> <ins class="diff-new">If the entry is a</ins> <a href= "#state"><ins class="diff-new">state object</ins></a> <ins class= "diff-new">entry, let</ins> <var title=""><ins class= "diff-new">state</ins></var> <ins class="diff-new">be that state object. Otherwise, the entry is the first entry for the</ins> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">; let</ins> <var title=""><ins class= "diff-new">state</ins></var> <ins class="diff-new">be null.</ins> </li> <li> <ins class="diff-new">The user agent must then</ins> fire a <dfn id="popstate" title= "event-popstate"><code>popstate</code></dfn> event in no namespace on <del class="diff-old">the</del> <a href="#the-body1">the body element</a> using the <code><a href= "#popstateevent">PopStateEvent</a></code> interface, with the <del class="diff-old">state object in the</del> <code title= "dom-PopStateEvent-state"><a href="#state0">state</a></code> <del class="diff-old">attribute.</del> <ins class= "diff-chg">attribute set to the value of</ins> <var title= ""><ins class="diff-chg">state</ins></var> . This event bubbles but is not cancelable and has no default action. </li> </ol> <pre class="idl"> interface <dfn id="popstateevent">PopStateEvent</dfn> : Event { readonly attribute DOMObject <a href="#state0" title= "dom-PopStateEvent-state">state</a>; <del class= "diff-old"> void (in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMObject statetArg); </del> <ins class="diff-chg"> void <a href="#initpopstateevent" title= "dom-PopStateEvent-initPopStateEvent">initPopStateEvent</a>(in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMObject stateArg); </ins> void <a href="#initpopstateeventns" title= "dom-PopStateEvent-initPopStateEventNS">initPopStateEventNS</a>(in DOMString namespaceURIArg, in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMObject stateArg); }; </pre> The <dfn id="initpopstateevent" title= "dom-PopStateEvent-initPopStateEvent"><code>initPopStateEvent()</code></dfn> and <dfn id="initpopstateeventns" title= "dom-PopStateEvent-initPopStateEventNS"><code>initPopStateEventNS()</code></dfn> methods must initialise the event in a manner analogous to the similarly-named methods in the DOM3 Events interfaces. <a href= "#references">[DOM3EVENTS]</a> The <dfn id="state0" title= "dom-PopStateEvent-state"><code>state</code></dfn> attribute represents the context information for the <del class= "diff-old">event. Should we coalesce these events</del> <ins class= "diff-chg">event, or null,</ins> if <del class="diff-old">they occur while</del> the <del class="diff-old">page</del> <ins class= "diff-chg">state represented</ins> is <del class="diff-old">away? (e.g. during traversal -- see above)</del> <ins class= "diff-chg">the initial state of the</ins> <code><ins class= "diff-chg">Document</ins></code> . <h4 id="the-location"><del class= "diff-old">4.7.4.</del> <ins class="diff-chg">4.8.4</ins> The <code><a href="#location2">Location</a></code> interface</h4> Each <code>Document</code> object in a browsing context's session history is associated with a unique instance of a <code><a href="#location2">Location</a></code> object. The <dfn id="location0" title= "dom-document-location"><code>location</code></dfn> attribute of the <code><a href="#htmldocument">HTMLDocument</a></code> interface must return the <code><a href="#location2">Location</a></code> object for that <code>Document</code> object. The <dfn id="location1" title= "dom-location"><code>location</code></dfn> attribute of the <code><a href="#window">Window</a></code> interface must return the <code><a href="#location2">Location</a></code> object for that <code><a href="#window">Window</a></code> object's <a href= "#active">active document</a> . <code><a href="#location2">Location</a></code> objects provide a representation of the URI of their document, and allow the <a href= "#current1">current entry</a> of the <a href="#browsing1">browsing context</a> 's session history to be changed, by adding or replacing entries in the <code title="dom-history"><a href= "#history1">history</a></code> object. <pre class="idl"> interface <dfn id="location2">Location</dfn> { readonly attribute DOMString <a href="#href5" title= "dom-location-href">href</a>; void <a href="#assign" title= "dom-location-assign">assign</a>(in DOMString url); void <a href="#replace" title= "dom-location-replace">replace</a>(in DOMString url); void reload(); // <a href="#uri-decomposition">URI decomposition attributes</a> attribute DOMString <a href="#protocol" title= "dom-location-protocol">protocol</a>; attribute DOMString <a href="#host" title= "dom-location-host">host</a>; attribute DOMString <a href="#hostname" title= "dom-location-hostname">hostname</a>; attribute DOMString <a href="#port" title= "dom-location-port">port</a>; attribute DOMString <a href="#pathname" title= "dom-location-pathname">pathname</a>; attribute DOMString <a href="#search" title= "dom-location-search">search</a>; attribute DOMString <a href="#hash" title= "dom-location-hash">hash</a>; }; </pre> <del class="diff-old">In the ECMAScript DOM binding, objects implementing this interface must stringify to the same value as the href attribute. In the ECMAScript DOM binding, the location members of the HTMLDocument and Window interfaces behave as if they had a setter: user agents must treats attempts to set these location attribute as attempts at setting the href attribute of the relevant Location object instead.</del> The <dfn id="href5" title= "dom-location-href"><code>href</code></dfn> attribute returns the address of the page represented by the associated <code>Document</code> object, as an absolute IRI reference. On setting, the user agent must act as if the <code title= "dom-location-assign"><a href="#assign">assign()</a></code> method had been called with the new value as its argument. When the <dfn id="assign" title= "dom-location-assign"><code>assign( <var title="">url</var> )</code></dfn> method is invoked, the UA must <a href= "#navigate">navigate</a> the <a href="#browsing1">browsing context</a> to the specified <var title="">url</var> . When the <dfn id="replace" title= "dom-location-replace"><code>replace( <var title="">url</var> )</code></dfn> method is invoked, the UA must <a href= "#navigate">navigate</a> <ins class="diff-new">the</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> to the specified <var title="">url</var> with <a href= "#replacement">replacement enabled</a> . <ins class="diff-new">Navigation for the</ins> <code title= "dom-location-assign"><a href="#assign"><ins class= "diff-new">assign()</ins></a></code> <ins class= "diff-new">and</ins> <code title="dom-location-replace"><a href= "#replace"><ins class="diff-new">replace()</ins></a></code> <ins class="diff-new">methods must be done with the</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">of the</ins> <code><a href= "#window"><ins class="diff-new">Window</ins></a></code> <ins class= "diff-new">object that is the</ins> <a href="#script2"><ins class= "diff-new">script execution context</ins></a> <ins class= "diff-new">of the script that invoked the method as the</ins> <a href="#source0"><ins class="diff-new">source browsing context</ins></a> . <ins class="diff-new">If the</ins> <a href= "#script2"><ins class="diff-new">script execution context</ins></a> <ins class="diff-new">of a script isn't a</ins> <code><a href= "#window"><ins class="diff-new">Window</ins></a></code> <ins class= "diff-new">object, then it can't ever get to a</ins> <code><a href= "#location2"><ins class="diff-new">Location</ins></a></code> <ins class="diff-new">object to call these methods.</ins> Relative <var title="">url</var> arguments for <code title= "dom-location-assign"><a href="#assign">assign()</a></code> and <code title="dom-location-replace"><a href= "#replace">replace()</a></code> must be resolved relative to the <a href="#scripts0" title="script's base URI">base URI of the script</a> that made the method call. The <code><a href="#location2">Location</a></code> interface also has the complement of <a href="#uri-decomposition">URI decomposition attributes</a> , <dfn id="protocol" title= "dom-location-protocol"><code>protocol</code></dfn> , <dfn id= "host" title="dom-location-host"><code>host</code></dfn> , <dfn id= "port" title="dom-location-port"><code>port</code></dfn> , <dfn id= "hostname" title= "dom-location-hostname"><code>hostname</code></dfn> , <dfn id= "pathname" title= "dom-location-pathname"><code>pathname</code></dfn> , <dfn id= "search" title="dom-location-search"><code>search</code></dfn> , and <dfn id="hash" title= "dom-location-hash"><code>hash</code></dfn> . These must follow the rules given for URI decomposition attributes, with the <a href= "#input" title="concept-uda-input">input</a> being the address of the page represented by the associated <code>Document</code> object, as an absolute IRI reference (same as the <code title= "dom-location-href"><a href="#href5">href</a></code> attribute), and the <a href="#common3" title="concept-uda-setter">common setter action</a> being the same as setting the <code title= "dom-location-href"><a href="#href5">href</a></code> attribute to the new output value. <h5 id="security6"><del class= "diff-old">4.7.4.1.</del> <ins class= "diff-chg">4.8.4.1.</ins> Security</h5> User agents must raise a <a href="#security9">security exception</a> whenever any of the members of a <code><a href= "#location2">Location</a></code> object are accessed by scripts whose <a href="#effective3"><ins class="diff-chg">effective script</ins> origin</a> is not the <a href="#same-origin" title= "same origin">same</a> as the <code><a href= "#location2">Location</a></code> object's associated <code>Document</code> 's <del class="diff-old">origin,</del> <a href="#effective3"><ins class="diff-chg">effective script origin</ins></a> , with the following exceptions: <ul> <li>The <code title="dom-location-href"><a href= "#href5">href</a></code> <del class="diff-old">setter</del> <ins class="diff-chg">setter, if the script is running in a</ins> <a href="#browsing1"><ins class="diff-chg">browsing context</ins></a> <ins class="diff-chg">that is</ins> <a href= "#allowed"><ins class="diff-chg">allowed to navigate</ins></a> <ins class="diff-chg">the browsing context with which the</ins> <code><a href="#location2"><ins class= "diff-chg">Location</ins></a></code> <ins class="diff-chg">object is associated</ins></li> </ul> User agents must not allow scripts to override the <code title= "dom-location-href"><a href="#href5">href</a></code> attribute's setter. <h4 id="history-notes"><del class= "diff-old">4.7.5.</del> <ins class="diff-chg">4.8.5</ins> Implementation notes for session history</h4> This section is non-normative. The <code><a href="#history2">History</a></code> interface is not meant to place restrictions on how implementations represent the session history to the user. For example, session history could be implemented in a tree-like manner, with each page having multiple "forward" pages. This specification doesn't define how the linear list of pages in the <code title="dom-history"><a href="#history1">history</a></code> object are derived from the actual session history as seen from the user's perspective. Similarly, a page containing two <code><a href= "#iframe">iframe</a></code> s has a <code title= "dom-history"><a href="#history1">history</a></code> object distinct from the <code><a href="#iframe">iframe</a></code> s' <code title="dom-history"><a href="#history1">history</a></code> objects, despite the fact that typical Web browsers present the user with just one "Back" button, with a session history that interleaves the navigation of the two inner frames and the outer page. Security: It is suggested that to avoid letting a page "hijack" the history navigation facilities of a UA by abusing <code title="dom-history-pushState"><a href= "#pushstate">pushState()</a></code> , the UA provide the user with a way to jump back to the previous page (rather than just going back to the previous state). For example, the back button could have a drop down showing just the pages in the session history, and not showing any of the states. Similarly, an aural browser could have two "back" commands, one that goes back to the previous state, and one that jumps straight back to the previous page. In addition, a user agent could ignore calls to <code title= "dom-history-pushState"><a href="#pushstate">pushState()</a></code> that are invoked on a timer, or from event handlers that do not represent a clear user action, or that are invoked in rapid succession. <h3 id="browsing0"><del class= "diff-old">4.8.</del> <ins class="diff-chg">4.9</ins> <ins class="diff-chg">Browsing the Web</ins></h3> <h4 id="navigating"><ins class= "diff-chg">4.9.1</ins> Navigating across documents</h4> Certain actions cause the <a href="#browsing1">browsing context</a> to <dfn id="navigate">navigate</dfn> . <ins class= "diff-new">Navigation always involves a</ins> <dfn id= "source0"><ins class="diff-new">source browsing context</ins></dfn> ,<ins class="diff-new">which is the browsing context which was responsible for starting the navigation.</ins> For example, <a href="#following0" title= "following hyperlinks">following a hyperlink</a> , form submission , and the <code title="dom-open"><a href= "#open2">window.open()</a></code> and <code title= "dom-location-assign"><a href= "#assign">location.assign()</a></code> methods can all cause a browsing context to navigate. A user agent may also provide various ways for the user to explicitly cause a browsing context to navigate. When a browsing context is navigated, the user agent must run the following steps: <ol> <li id="sandboxLinks"> <ins class="diff-new">If the</ins> <a href= "#source0"><ins class="diff-new">source browsing context</ins></a> <ins class="diff-new">is not the same as the</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">being navigated, and the</ins> <a href= "#source0"><ins class="diff-new">source browsing context</ins></a> <ins class="diff-new">is not one of the</ins> <a href="#ancestor" title="ancestor browsing context"><ins class="diff-new">ancestor browsing contexts</ins></a> <ins class="diff-new">of the</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">being navigated, and the</ins> <a href="#source0"><ins class="diff-new">source browsing context</ins></a> <ins class="diff-new">has its</ins> <a href= "#sandboxed"><ins class="diff-new">sandboxed navigation browsing context flag</ins></a> <ins class="diff-new">set, then abort these steps. The user agent may offer to open the specified resource in a new</ins> <a href="#top-level"><ins class="diff-new">top-level browsing context</ins></a> <ins class="diff-new">or in the</ins> <a href="#top-level"><ins class="diff-new">top-level browsing context</ins></a> <ins class="diff-new">of the</ins> <a href= "#source0"><ins class="diff-new">source browsing context</ins></a> ,<ins class="diff-new">at the user's option, in which case the user agent must</ins> <a href="#navigate"><ins class= "diff-new">navigate</ins></a> <ins class="diff-new">that designated</ins> <a href="#top-level"><ins class= "diff-new">top-level browsing context</ins></a> <ins class= "diff-new">to the specified resource as if the user had requested it independently.</ins> </li> <li id="seamlessLinks"> <ins class="diff-new">If the</ins> <a href= "#source0"><ins class="diff-new">source browsing context</ins></a> <ins class="diff-new">is the same as the</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">being navigated, and this browsing context has its</ins> <a href="#seamless0"><ins class="diff-new">seamless browsing context flag</ins></a> <ins class="diff-new">set, then find the nearest</ins> <a href="#ancestor"><ins class= "diff-new">ancestor browsing context</ins></a> <ins class= "diff-new">that does not have its</ins> <a href= "#seamless0"><ins class="diff-new">seamless browsing context flag</ins></a> <ins class="diff-new">set, and continue these steps as if</ins> <ins class="diff-new">that</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">was the one that was going to be</ins> <a href="#navigate" title="navigate"><ins class= "diff-new">navigated</ins></a> <ins class= "diff-new">instead.</ins> </li> <li> Cancel any preexisting attempt to navigate the browsing context. </li> <li> If the new resource is the same as the current resource, but a fragment identifier has been specified, <ins class= "diff-new">changed, or removed,</ins> then <a href="#navigating0" title="navigate-fragid">navigate to that fragment identifier</a> and abort these steps. </li> <li> If the new resource is to be handled by displaying some sort of inline content, e.g. an error message because the specified scheme is not one of the supported protocols, or an inline prompt to allow the user to select <a href="#registerprotocolhandler" title= "dom-navigator-registerProtocolHandler">a registered handler</a> for the given scheme, then <a href="#page-load4" title= "navigate-ua-inline">display the inline content</a> and abort these steps. </li> <li> If the new resource is to be handled using a mechanism that does not affect the browsing context, then abort these steps and proceed with that mechanism instead. </li> <li> If the new resource is to be fetched using HTTP GET or equivalent, and if the browsing context being navigated is a <a href="#top-level">top-level browsing context</a> , then check if there are any <a href="#application0" title= "application cache">application caches</a> that have a <a href= "#the-manifest" title="concept-appcache-manifest">manifest</a> with the <a href="#same-origin">same <del class= "diff-old">scheme/host/port</del> <ins class= "diff-chg">origin</ins></a> as the URI in question, and that have this URI as one of their entries (excluding entries marked as <a href="#foreign" title="concept-appcache-foreign"><del class= "diff-old">manifest</del> <ins class="diff-chg">foreign</ins></a> ), and that already contain their manifest, <del class= "diff-old">categorised</del> <ins class= "diff-chg">categorized</ins> as a <a href="#the-manifest" title= "concept-appcache-manifest">manifest</a> . If so, then the user agent must then fetch the resource from the <a href="#select0" title="concept-appcache-selection">most appropriate application cache</a> of those that match. Otherwise, start fetching the specified resource in the appropriate manner (e.g. performing an HTTP GET or POST operation, or reading the file from disk, or executing script in the case of a <a href="#the-javascript" title="javascript protocol"><code title= "">javascript:</code> URI</a> ). If this results in a redirect, return to step 2 with the new resource. For example, imagine an HTML page with an associated application cache displaying an image and a form, where the image is also used by several other application caches. If the user right-clicks on the image and chooses "View Image", then the user agent could decide to show the image from any of those caches, but it is likely that the most useful cache for the user would be the one that was used for the aforementioned HTML page. On the other hand, if the user submits the form, and the form does a POST submission, then the user agent will not use an application cache at all; the submission will be made to the network. </li> <li> Wait for one or more bytes to be available or for the user agent to establish that the resource in question is empty. During this time, the user agent may allow the user to cancel this navigation attempt or start other navigation attempts. </li> <li> If the resource was not fetched from an <a href= "#application0">application cache</a> , and was to be fetched using HTTP GET or equivalent, and its URI <a href="#matches" title= "concept-appcache-matches-oppcache">matches the opportunistic caching namespace</a> of one or more application caches, <ins class="diff-new">and the user didn't cancel the navigation attempt during the previous step,</ins> then: <dl class="switch"> <dt>If the <del class="diff-old">file was successfully downloaded The user agent must cache</del> <ins class="diff-chg">browsing context being navigated is a</ins> <a href="#top-level"><ins class= "diff-chg">top-level browsing context</ins></a> ,<ins class= "diff-chg">and</ins> the <del class="diff-old">resource in all those application caches, categorised as opportunistically cached entries . If</del> <ins class="diff-chg">navigation attempt failed (e.g.</ins> the server returned a 4xx or 5xx status code or equivalent, or there <del class="diff-old">were network errors If the browsing context being navigated is</del> <ins class= "diff-chg">was</ins> a <del class="diff-old">top-level browsing context , then the user agent must discard the failed load and instead use</del> <ins class="diff-chg">DNS error)</ins></dt> <dd> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">candidate</ins></var> <ins class="diff-chg">be</ins> the <a href="#fallback0" title="concept-appcache-fallback">fallback resource</a> specified for the opportunistic caching namespace in question. If multiple application caches match, the user agent must use the fallback of the <a href="#select0" title= "concept-appcache-selection">most appropriate application cache</a> of those that match. <ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">candidate</ins></var> <ins class="diff-new">is not marked as</ins> <a href="#foreign" title= "concept-appcache-foreign"><ins class="diff-new">foreign</ins></a> ,<ins class="diff-new">then the user agent must discard the failed load and instead continue along these steps using</ins> <var title= ""><ins class="diff-new">candidate</ins></var> <ins class= "diff-new">as the resource.</ins> For the purposes of session history (and features that depend on session history, e.g. bookmarking) the user agent must use the URI of the resource that was requested (the one that matched the opportunistic caching namespace), not the fallback resource. However, the user agent may indicate to the user that the original page load failed, that the page used was a fallback resource, and what the URI of the fallback resource actually is. </dd> <dt><ins class="diff-new">Otherwise</ins></dt> <dd> <ins class="diff-new">Once the download is complete, if there were no errors and the user didn't cancel the request, the user agent must cache the resource in all the application caches that have a</ins> <a href="#matches" title= "concept-appcache-matches-oppcache"><ins class="diff-new">matching opportunistic caching namespace</ins></a> ,<ins class= "diff-new">categorized as</ins> <a href="#opportunistically" title= "concept-appcache-oppcache"><ins class="diff-new">opportunistically cached entries</ins></a> .<ins class="diff-new">Meanwhile, the user must continue along these steps.</ins> </dd> </dl> </li> <li> If the document's out-of-band metadata (e.g. HTTP headers), not counting any <a href="#content-type8" title="Content-Type">type information</a> (such as the Content-Type HTTP header), requires some sort of processing that will not affect the browsing context, then perform that processing and abort these steps. <div class="note"> Such processing might be triggered by, amongst other things, the following: <ul class="brief"> <li>HTTP status codes (e.g. 204 No Content or 205 Reset Content)</li> <li>HTTP Content-Disposition headers</li> <li>Network errors</li> </ul> </div> </li> <li> Let <var title="">type</var> be <a href="#sniffed" title= "Content-Type sniffing">the sniffed type of the resource</a> . </li> <li> If the user agent has been configured to process resources of the given <var title="">type</var> using some mechanism other than rendering the content in a <a href="#browsing1">browsing context</a> , then skip this step. Otherwise, if the <var title= "">type</var> is one of the following types, jump to the appropriate entry in the following list, and process the resource as described there: <dl class="switch"> <dt>"text/html"</dt> <dd>Follow the steps given in the <a href="#page-load" title= "navigate-html">HTML document</a> section, and abort these steps.</dd> <dt>Any type ending in "+xml"</dt> <dt>"application/xml"</dt> <dt>"text/xml"</dt> <dd>Follow the steps given in the <a href="#page-load0" title= "navigate-xml">XML document</a> section. If that section determines that the content is not to be displayed as a generic XML document, then proceed to the next step in this overall set of steps. Otherwise, abort these steps.</dd> <dt>"text/plain"</dt> <dd>Follow the steps given in the <a href="#page-load1" title= "navigate-text">plain text file</a> section, and abort these steps.</dd> <dt>A supported image type</dt> <dd>Follow the steps given in the <a href="#page-load2" title= "navigate-image">image</a> section, and abort these steps.</dd> <dt>A type that will use an external application to render the content in the <a href="#browsing1">browsing context</a></dt> <dd>Follow the steps given in the <a href="#page-load3" title= "navigate-plugin">plugin</a> section, and abort these steps.</dd> </dl> </li> <li id="navigate-non-Document"> If, given <var title="">type</var> , the new resource is to be handled by displaying some sort of inline content, e.g. a native rendering of the content, an error message because the specified type is not supported, or an inline prompt to allow the user to select <a href="#registercontenthandler" title= "dom-navigator-registerContentHandler">a registered handler</a> for the given type, then <a href="#page-load4" title= "navigate-ua-inline">display the inline content</a> and abort these steps. </li> <li> Otherwise, the document's <var title="">type</var> is such that the resource will not affect the browsing context, e.g. because the resource is to be handed to an external application. Process the resource appropriately. </li> </ol> Some of the sections below, to which the above algorithm defers in certain cases, require the user agent to <dfn id= "update2">update the session history with the new page</dfn> . When a user agent is required to do this, it must follows the set of steps given below that is appropriate for the situation at hand. From the point of view of any script, these steps must occur atomically. <ol> <li> pause for scripts </li> <li> <del class="diff-old">onbeforeunload</del> <ins class="diff-chg">onbeforeunload, and if present set flag that we will kill document</ins> </li> <li> <del class="diff-old">onunload</del> <ins class="diff-chg">onunload, and if present set flag that we will kill document</ins> </li> <li> <ins class="diff-chg">if flag is set: reset timers, empty event queue, kill any pending transactions, kill XMLHttpRequests, etc, and set things up so that the document will be discarded asap</ins> </li> <li> <dl> <dt>If the navigation was initiated for <dfn id="entry">entry update</dfn> of an entry</dt> <dd> <ol> <li> Replace the entry being updated with a new entry representing the new resource and its <code>Document</code> object and related state. The user agent may propagate state from the old entry to the new entry (e.g. scroll position). </li> <li> <a href="#traverse">Traverse the history</a> to the new entry. </li> </ol> </dd> <dt>Otherwise</dt> <dd> <ol> <li> Remove all the entries after the <a href="#current1">current entry</a> in the <a href="#browsing1">browsing context</a> 's <code>Document</code> object's <code><a href= "#history2">History</a></code> object. This <a href="#history-notes">doesn't necessarily have to affect</a> the user agent's user interface. </li> <li> Append a new entry at the end of the <code><a href= "#history2">History</a></code> object representing the new resource and its <code>Document</code> object and related state. </li> <li> <a href="#traverse">Traverse the history</a> to the new entry. </li> <li> If the navigation was initiated with <dfn id= "replacement">replacement enabled</dfn> , remove the entry immediately before the new <a href="#current1">current entry</a> in the session history. </li> </ol> </dd> </dl> </li> </ol> <h4 id="read-html"><del class= "diff-old">4.8.1.</del> <ins class="diff-chg">4.9.2</ins> <dfn id="page-load" title="navigate-html">Page load processing model for HTML files</dfn></h4> When an HTML document is to be loaded in a <a href= "#browsing1">browsing context</a> , the user agent must create a <code>Document</code> object, mark it as being an <a href="#html-" title="HTML documents">HTML document</a> , create an <a href= "#html-0">HTML parser</a> , associate it with the document, and begin to use the bytes provided for the document as the <a href= "#input0">input stream</a> for that parser. The <a href="#input0">input stream</a> converts bytes into characters for use in the tokeniser . This process relies, in part, on character encoding information found in the real <a href="#content-type8" title="Content-Type">Content-Type metadata</a> of the resource; the "sniffed type" is not used for this purpose. When no more bytes are available, an EOF character is implied, which eventually causes a <code title="event-load"><a href= "#load0">load</a></code> event to be fired. After creating the <code>Document</code> object, but potentially before the page has finished parsing, the user agent must <a href= "#update2">update the session history with the new page</a> . <a href="#application2" title= "concept-appcache-init-with-attribute">Application cache selection</a> happens <a href="#parser-appcache">in the HTML parser</a> . <h4 id="read-xml"><del class= "diff-old">4.8.2.</del> <ins class="diff-chg">4.9.3</ins> <dfn id="page-load0" title="navigate-xml">Page load processing model for XML files</dfn></h4> When faced with displaying an XML file inline, user agents must first create a <code>Document</code> object, following the requirements of the XML and Namespaces in XML recommendations, RFC 3023, DOM3 Core, and other relevant specifications. <a href= "#references">[XML]</a> <a href="#references">[XMLNS]</a> <a href= "#references">[RFC3023]</a> <a href= "#references">[DOM3CORE]</a> The actual HTTP headers and other metadata, not the headers as mutated or implied by the algorithms given in this specification, are the ones that must be used when determining the character encoding according to the rules given in the above specifications. <ins class="diff-new">Once the character encoding is established, the</ins> <a href="#character1"><ins class="diff-new">document's character encoding</ins></a> <ins class="diff-new">must be set to that character encoding.</ins> If the root element, as parsed according to the XML specifications cited above, is found to be an <code><a href= "#html">html</a></code> element with an attribute <code title= "attr-html-manifest"><a href="#manifest">manifest</a></code> , then, as soon as the element is inserted into the DOM, the user agent must run the <a href="#application2" title= "concept-appcache-init-with-attribute">application cache selection algorithm</a> with the value of that <del class= "diff-old">attribute</del> <ins class="diff-chg">attribute, resolved relative to the</ins> <a href="#elements2"><ins class= "diff-chg">element's base URI</ins></a> , as the manifest URI. Otherwise, as soon as the root element is inserted into the DOM, the user agent must run the <a href="#application3" title= "concept-appcache-init-no-attribute">application cache selection algorithm</a> with no manifest. Because the processing of the <code title= "attr-html-manifest"><a href="#manifest">manifest</a></code> attribute happens only once the root element is parsed, any URIs referenced by processing instructions before the root element (such as <code title=""><?xml-styleesheet?></code> and <code title= ""><?xbl?></code> PIs) will be fetched from the network and cannot be cached. User agents may examine the namespace of the root <code>Element</code> node of this <code>Document</code> object to perform namespace-based dispatch to alternative processing tools, e.g. determining that the content is actually a syndication feed and passing it to a feed handler. If such processing is to take place, abort the steps in this section, and jump to <a href= "#navigate-non-Document">step 10</a> in the <a href= "#navigate">navigate</a> steps above. Otherwise, then, with the newly created <code>Document</code> , the user agents must <a href="#update2">update the session history with the new page</a> . User agents may do this before the complete document has been parsed (thus achieving incremental rendering ). Error messages from the parse process (e.g. namespace well-formedness errors) may be reported inline by mutating the <code>Document</code> . <h4 id="read-text"><del class= "diff-old">4.8.3.</del> <ins class="diff-chg">4.9.4</ins> <dfn id="page-load1" title="navigate-text">Page load processing model for text files</dfn></h4> When a plain text document is to be loaded in a <a href= "#browsing1">browsing context</a> , the user agent should create a <code>Document</code> object, mark it as being an <a href="#html-" title="HTML documents">HTML document</a> , create an <a href= "#html-0">HTML parser</a> , associate it with the document, act as if the tokeniser had emitted a start tag token with the tag name "pre", set the <a href="#tokenisation0">tokenisation</a> stage's <a href="#content2">content model flag</a> to PLAINTEXT , and begin to pass the stream of characters in the plain text document to that tokeniser. The rules for how to convert the bytes of the plain text document into actual characters are defined in RFC 2046, RFC 2646, and subsequent versions thereof. <a href= "#references">[RFC2046]</a> <a href="#references">[RFC2646]</a> <ins class="diff-new">The</ins> <a href= "#character1"><ins class="diff-new">document's character encoding</ins></a> <ins class="diff-new">must be set to the character encoding used to decode the document.</ins> Upon creation of the <code>Document</code> object, the user agent must run the <a href="#application3" title= "concept-appcache-init-no-attribute">application cache selection algorithm</a> with no manifest. When no more character are available, an EOF character is implied, which eventually causes a <code title= "event-load"><a href="#load0">load</a></code> event to be fired. After creating the <code>Document</code> object, but potentially before the page has finished parsing, the user agent must <a href= "#update2">update the session history with the new page</a> . User agents may add content to the <code><a href= "#head">head</a></code> element of the <code>Document</code> , e.g. linking to stylesheet or an XBL binding, providing script, giving the document a <code><a href="#title1">title</a></code> , etc. <h4 id="read-image"><del class= "diff-old">4.8.4.</del> <ins class="diff-chg">4.9.5</ins> <dfn id="page-load2" title="navigate-image">Page load processing model for images</dfn></h4> When an image resource is to be loaded in a <a href= "#browsing1">browsing context</a> , the user agent should create a <code>Document</code> object, mark it as being an <a href="#html-" title="HTML documents">HTML document</a> , append an <code><a href= "#html">html</a></code> element to the <code>Document</code> , append a <code><a href="#head">head</a></code> element and a <code><a href="#body0">body</a></code> element to the <code><a href="#html">html</a></code> element, append an <code><a href="#img">img</a></code> to the <code><a href= "#body0">body</a></code> element, and set the <code title= "attr-img-src"><a href="#src">src</a></code> attribute of the <code><a href="#img">img</a></code> element to the address of the image. Then, the user agent must act as if it had <a href="#stops" title="stop parsing">stopped parsing</a> . Upon creation of the <code>Document</code> object, the user agent must run the <a href="#application3" title= "concept-appcache-init-no-attribute">application cache selection algorithm</a> with no manifest. After creating the <code>Document</code> object, but potentially before the page has finished fully loading, the user agent must <a href="#update2">update the session history with the new page</a> . User agents may add content to the <code><a href= "#head">head</a></code> element of the <code>Document</code> , or attributes to the <code><a href="#img">img</a></code> element, e.g. to link to stylesheet or an XBL binding, to provide a script, to give the document a <code><a href="#title1">title</a></code> , etc. <h4 id="read-plugin"><del class= "diff-old">4.8.5.</del> <ins class="diff-chg">4.9.6</ins> <dfn id="page-load3" title="navigate-plugin">Page load processing model for content that uses plugins</dfn></h4> When a resource that requires an external resource to be rendered is to be loaded in a <a href="#browsing1">browsing context</a> , the user agent should create a <code>Document</code> object, mark it as being an <a href="#html-" title= "HTML documents">HTML document</a> , append an <code><a href= "#html">html</a></code> element to the <code>Document</code> , append a <code><a href="#head">head</a></code> element and a <code><a href="#body0">body</a></code> element to the <code><a href="#html">html</a></code> element, append an <code><a href="#embed">embed</a></code> to the <code><a href= "#body0">body</a></code> element, and set the <code title= "attr-img-src"><a href="#src">src</a></code> attribute of the <code><a href="#img">img</a></code> element to the address of the image. Then, the user agent must act as if it had <a href="#stops" title="stop parsing">stopped parsing</a> . Upon creation of the <code>Document</code> object, the user agent must run the <a href="#application3" title= "concept-appcache-init-no-attribute">application cache selection algorithm</a> with no manifest. After creating the <code>Document</code> object, but potentially before the page has finished fully loading, the user agent must <a href="#update2">update the session history with the new page</a> . User agents may add content to the <code><a href= "#head">head</a></code> element of the <code>Document</code> , or attributes to the <code><a href="#embed">embed</a></code> element, e.g. to link to stylesheet or an XBL binding, or to give the document a <code><a href="#title1">title</a></code> . <ins class="diff-new">If the</ins> <a href="#sandboxed0"><ins class="diff-new">sandboxed plugins browsing context flag</ins></a> <ins class="diff-new">is set on the</ins> <a href="#browsing1"><ins class= "diff-new">browsing context</ins></a> ,<ins class="diff-new">the synthesized</ins> <code><a href="#embed"><ins class= "diff-new">embed</ins></a></code> <ins class="diff-new">element will</ins> <a href="#sandboxPluginEmbed"><ins class="diff-new">fail to render the content</ins></a> . <h4 id="read-ua-inline"><del class= "diff-old">4.8.6.</del> <ins class="diff-chg">4.9.7</ins> <dfn id="page-load4" title="navigate-ua-inline">Page load processing model for inline content that doesn't have a DOM</dfn></h4> When the user agent is to display a user agent page inline in a <a href="#browsing1">browsing context</a> , the user agent should create a <code>Document</code> object, mark it as being an <a href= "#html-" title="HTML documents">HTML document</a> , and then either associate that <code>Document</code> with a custom rendering that is not rendered using the normal <code>Document</code> rendering rules, or mutate that <code>Document</code> until it represents the content the user agent wants to render. Once the page has been set up, the user agent must act as if it had <a href="#stops" title="stop parsing">stopped parsing</a> . Upon creation of the <code>Document</code> object, the user agent must run the <a href="#application3" title= "concept-appcache-init-no-attribute">application cache selection algorithm</a> with no manifest. After creating the <code>Document</code> object, but potentially before the page has been completely set up, the user agent must <a href="#update2">update the session history with the new page</a> . <h4 id="scroll-to-fragid"><del class= "diff-old">4.8.7.</del> <ins class="diff-chg">4.9.8</ins> <dfn id="navigating0" title="navigate-fragid">Navigating to a fragment identifier</dfn></h4> When a user agent is supposed to navigate to a fragment identifier, then the user agent must <a href="#update2">update the session history with the new page</a> , where "the new page" has the same <code>Document</code> as before but with the URI having the newly specified fragment identifier. Part of that algorithm involves the user agent having to <a href="#scroll">scroll to the fragment identifier</a> , which is the important part for this step. When the user agent is required to <dfn id="scroll">scroll to the fragment identifier</dfn> , it must change the scrolling position of the document, or perform some other action, such that <a href="#the-indicated">the indicated part of the document</a> is brought to the user's attention. If there is no indicated part, then the user agent must not scroll anywhere. The <dfn id="the-indicated">the indicated part of the document</dfn> is the one that the fragment <del class= "diff-old">identifier</del> <ins class="diff-chg">identifier, if any,</ins> identifies. The semantics of the fragment identifier in terms of mapping it to a specific DOM Node is defined by the MIME type specification of the document's MIME Type (for example, the processing of fragment identifiers for XML MIME types is the responsibility of RFC3023). For HTML documents (and the <code>text/html</code> MIME type), the following processing model must be followed to determine what <a href="#the-indicated">the indicated part of the document</a> is. <ol> <li> Let fragid be the <fragment> part of the URI. <a href="#references">[RFC3987]</a> </li> <li> If fragid is the empty string, then the <del class= "diff-old">the</del> indicated part of the document is the top of the document. </li> <li> If there is an element in the DOM that has an ID exactly equal to fragid , then the first such element in tree order is <a href="#the-indicated">the indicated part of the document</a> ; stop the algorithm here. </li> <li> If there is an <code><a href="#a">a</a></code> element in the DOM that has a <code title="attr-a-name">name</code> attribute whose value is exactly equal to fragid , then the first such element in tree order is <a href="#the-indicated">the indicated part of the document</a> ; stop the algorithm here. </li> <li> Otherwise, there is no indicated part of the document. </li> </ol> For the purposes of the interaction of HTML with Selectors' <del class="diff-old">:target</del> <code title="">:target</code> pseudo-class, the target element is <a href= "#the-indicated">the indicated part of the document</a> , if that is an element; otherwise there is no target element . <a href="#references">[SELECTORS]</a> <h4 id="history0"><ins class= "diff-new">4.9.9</ins> <ins class="diff-new">History traversal</ins></h4> <ins class="diff-new">When a user agent is required to</ins> <dfn id="traverse"><ins class="diff-new">traverse the history</ins></dfn> <ins class="diff-new">to a</ins> <ins class= "diff-new">specified entry</ins> ,<ins class="diff-new">the user agent must act as follows:</ins> <ol> <li> <ins class="diff-new">If there is no longer a</ins> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">object for the entry in question, the user agent must</ins> <a href="#navigate"><ins class= "diff-new">navigate</ins></a> <ins class="diff-new">the browsing context to the location for that entry to perform an</ins> <a href= "#entry"><ins class="diff-new">entry update</ins></a> <ins class= "diff-new">of that entry, and abort these steps. The "</ins> <a href="#navigate"><ins class="diff-new">navigate</ins></a> <ins class="diff-new">" algorithm reinvokes this "traverse" algorithm to complete the traversal, at which point there</ins> <ins class="diff-new">is</ins> <ins class= "diff-new">a</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">object and so this step gets skipped. The navigation must be done using the same</ins> <a href="#source0"><ins class="diff-new">source browsing context</ins></a> <ins class="diff-new">as was used the first time this entry was created.</ins> </li> <li> <ins class="diff-new">If appropriate, update the</ins> <a href= "#current1"><ins class="diff-new">current entry</ins></a> <ins class="diff-new">in the</ins> <a href="#browsing1"><ins class= "diff-new">browsing context</ins></a> <ins class= "diff-new">'s</ins> <code><ins class= "diff-new">Document</ins></code> <ins class= "diff-new">object's</ins> <code><a href="#history2"><ins class= "diff-new">History</ins></a></code> <ins class="diff-new">object to reflect any state that the user agent wishes to persist.</ins> <ins class="diff-new">For example, some user agents might want to persist the scroll position, or the values of form controls.</ins> </li> <li> <ins class="diff-new">If the</ins> <ins class= "diff-new">specified entry</ins> <ins class="diff-new">has a different</ins> <code><ins class="diff-new">Document</ins></code> <ins class="diff-new">object than the</ins> <a href= "#current1"><ins class="diff-new">current entry</ins></a> <ins class="diff-new">then the user agent must run the following substeps:</ins> <ol> <li class="big-issue"><ins class="diff-new">freeze any timers, intervals, XMLHttpRequests, database transactions, etc</ins></li> <li><ins class="diff-new">The user agent must move any properties that have been added to the browsing context's default view's</ins> <code><a href="#window"><ins class= "diff-new">Window</ins></a></code> <ins class="diff-new">object to the</ins> <a href="#active"><ins class="diff-new">active document</ins></a> <ins class="diff-new">'s</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">'s</ins> <a href="#list-of2"><ins class="diff-new">list of added properties</ins></a> .</li> <li><ins class="diff-new">If the browsing context is a</ins> <a href="#top-level"><ins class="diff-new">top-level browsing context</ins></a> <ins class="diff-new">(and not an</ins> <a href= "#auxiliary0"><ins class="diff-new">auxiliary browsing context</ins></a> <ins class="diff-new">), and the</ins> <a href= "#origin0"><ins class="diff-new">origin</ins></a> <ins class= "diff-new">of the</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">of the</ins> <ins class="diff-new">specified entry</ins> <ins class= "diff-new">is not the</ins> <a href="#same-origin" title= "same origin"><ins class="diff-new">same</ins></a> <ins class= "diff-new">as the</ins> <a href="#origin0"><ins class= "diff-new">origin</ins></a> <ins class="diff-new">of the</ins> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">of the</ins> <a href="#current1"><ins class= "diff-new">current entry</ins></a> ,<ins class="diff-new">then the following sub-sub-steps must be run:</ins> <ol> <li><ins class="diff-new">The current</ins> <a href= "#browsing2"><ins class="diff-new">browsing context name</ins></a> <ins class="diff-new">must be stored with all the entries in the history that are associated with</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">objects with the</ins> <a href="#same-origin"><ins class="diff-new">same origin</ins></a> <ins class="diff-new">as the</ins> <a href= "#active"><ins class="diff-new">active document</ins></a> <ins class="diff-new">and</ins> <ins class="diff-new">that are contiguous with the</ins> <a href="#current1"><ins class= "diff-new">current entry</ins></a> .</li> <li id="resetBCName"><ins class="diff-new">The browsing context's</ins> <a href="#browsing2"><ins class="diff-new">browsing context name</ins></a> <ins class="diff-new">must be unset.</ins></li> </ol> </li> <li id="appcache-history-2"><ins class="diff-new">The user agent must make the</ins> <ins class="diff-new">specified entry</ins> <ins class="diff-new">'s</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">object the</ins> <a href="#active"><ins class="diff-new">active document</ins></a> <ins class="diff-new">of the</ins> <a href= "#browsing1"><ins class="diff-new">browsing context</ins></a> .<ins class="diff-new">(If it is a</ins> <a href= "#top-level"><ins class="diff-new">top-level browsing context</ins></a> ,<ins class="diff-new">this might</ins> <a href= "#appcache-history-1"><ins class="diff-new">change</ins></a> <ins class="diff-new">which</ins> <a href= "#application0"><ins class="diff-new">application cache</ins></a> <ins class="diff-new">it is associated with.)</ins></li> <li><ins class="diff-new">If the</ins> <ins class= "diff-new">specified entry</ins> <ins class="diff-new">has a</ins> <a href="#browsing2"><ins class="diff-new">browsing context name</ins></a> <ins class="diff-new">stored with it, then the following sub-sub-steps must be run:</ins> <ol> <li><ins class="diff-new">The browsing context's</ins> <a href= "#browsing2"><ins class="diff-new">browsing context name</ins></a> <ins class="diff-new">must be set to the name stored with the specified entry.</ins></li> <li><ins class="diff-new">Any</ins> <a href= "#browsing2"><ins class="diff-new">browsing context name</ins></a> <ins class="diff-new">stored with the entries in the history that are associated with</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">objects with the</ins> <a href="#same-origin"><ins class="diff-new">same origin</ins></a> <ins class="diff-new">as the new</ins> <a href= "#active"><ins class="diff-new">active document</ins></a> ,<ins class="diff-new">and that are contiguous with the specified entry, must be cleared.</ins></li> </ol> </li> <li><ins class="diff-new">The user agent must move any properties that have been added to the</ins> <a href="#active"><ins class= "diff-new">active document</ins></a> <ins class="diff-new">'s</ins> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">'s</ins> <a href="#list-of2"><ins class="diff-new">list of added properties</ins></a> <ins class="diff-new">to browsing context's default view's</ins> <code><a href="#window"><ins class= "diff-new">Window</ins></a></code> <ins class= "diff-new">object.</ins></li> <li class="big-issue"><ins class="diff-new">unfreeze any timers, intervals, XMLHttpRequests, database transactions, etc</ins></li> </ol> </li> <li> <ins class="diff-new">If there are any entries with state objects between the</ins> <a href="#last-activated"><ins class= "diff-new">last activated entry</ins></a> <ins class="diff-new">for the</ins> <code><ins class="diff-new">Document</ins></code> <ins class="diff-new">of the</ins> <ins class= "diff-new">specified entry</ins> <ins class="diff-new">and the</ins> <ins class="diff-new">specified entry</ins> <ins class="diff-new">itself (not inclusive), then the user agent must iterate through every entry between that</ins> <a href= "#last-activated"><ins class="diff-new">last activated entry</ins></a> <ins class="diff-new">and the</ins> <ins class= "diff-new">specified entry</ins> ,<ins class= "diff-new">starting with the entry closest to the</ins> <a href= "#current1"><ins class="diff-new">current entry</ins></a> ,<ins class="diff-new">and ending with the one closest to the</ins> <ins class="diff-new">specified entry</ins> .<ins class= "diff-new">For each entry, if the entry is a state object, the user agent must</ins> <a href="#activating0"><ins class= "diff-new">activate the state object</ins></a> . </li> <li> <ins class="diff-new">If the</ins> <ins class= "diff-new">specified entry</ins> <ins class="diff-new">is a state object or the first entry for a</ins> <code><ins class= "diff-new">Document</ins></code> ,<ins class="diff-new">the user agent must</ins> <a href="#activating0" title= "activate the state object"><ins class="diff-new">activate that entry</ins></a> . </li> <li> <ins class="diff-new">If the</ins> <ins class= "diff-new">specified entry</ins> <ins class="diff-new">has a URI that differs from the</ins> <a href="#current1"><ins class= "diff-new">current entry</ins></a> <ins class="diff-new">'s only by its fragment identifier, and the two share the same</ins> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">object, then</ins> <a href="#firing2"><ins class= "diff-new">fire a simple event</ins></a> <ins class="diff-new">with the name</ins> <code><ins class="diff-new">hashchanged</ins></code> <ins class="diff-new">at</ins> <a href="#the-body1"><ins class= "diff-new">the</ins> <code><ins class="diff-new">body</ins></code> <ins class="diff-new">element</ins></a> ,<ins class="diff-new">and, if the new URI has a fragment identifier,</ins> <a href= "#scroll"><ins class="diff-new">scroll to the fragment identifier</ins></a> . </li> <li> <ins class="diff-new">User agents may also update other aspects of the document view when the location changes in this way, for instance the scroll position, values of form fields, etc.</ins> </li> <li> <ins class="diff-new">The</ins> <a href="#current1"><ins class= "diff-new">current entry</ins></a> <ins class="diff-new">is now the</ins> <ins class="diff-new">specified entry</ins> . </li> </ol> <ins class="diff-new">how does the changing of the global attributes affect .watch() when seen from other Windows?</ins> <h3 id="content-type-sniffing"><del class= "diff-old">4.9.</del> <ins class="diff-chg">4.10</ins> Determining the type of a new resource in a browsing context</h3> It is imperative that the rules in this section be followed exactly. When <del class="diff-old">two</del> <ins class="diff-chg">a</ins> user <del class="diff-old">agents use</del> <ins class="diff-chg">agent uses</ins> different heuristics for content type <del class="diff-old">detection,</del> <ins class="diff-chg">detection than the server expects,</ins> security problems can occur. For example, if a server believes <ins class="diff-new">that the client will treat</ins> a contributed file <del class="diff-old">to be</del> <ins class= "diff-chg">as</ins> an image (and thus <ins class="diff-new">treat it as</ins> benign), but a Web browser believes the content to be HTML (and thus <del class="diff-old">capable of executing script),</del> <ins class="diff-chg">execute any scripts contained therein),</ins> the end user can be exposed to malicious content, making the user vulnerable to cookie theft attacks and other cross-site scripting attacks. The <dfn id="sniffed" title="Content-Type sniffing">sniffed type of a resource</dfn> must be found as follows: <ol> <li> <ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">official type</ins></var> <ins class="diff-new">be the type given by the</ins> <a href="#content-type8" title= "Content-Type"><ins class="diff-new">Content-Type metadata</ins></a> <ins class="diff-new">for the resource (in lowercase, ignoring any parameters). If there is no such type, jump to the</ins> <a href= "#content-type5"><ins class="diff-new">unknown type</ins></a> <ins class="diff-new">step below.</ins> </li> <li> <ins class="diff-new">If the user agent is configured to strictly obey Content-Type headers for this resource, then jump to the last step in this set of steps.</ins> </li> <li> If the resource was fetched over an HTTP <del class= "diff-old">protocol,</del> <ins class="diff-chg">protocol</ins> and there is <del class="diff-old">no HTTP Content-Encoding header, but there is</del> an HTTP Content-Type header and <del class= "diff-old">it has a</del> <ins class="diff-chg">the</ins> value <del class="diff-old">whose</del> <ins class="diff-chg">of the first such header has</ins> bytes <ins class="diff-new">that</ins> exactly match one of the following <del class= "diff-old">three</del> lines: <table> <thead> <tr> <th>Bytes in Hexadecimal</th> <th>Textual representation</th> </tr> </thead> <tbody> <tr> <td>74 65 78 74 2f 70 6c 61 69 6e</td> <td><code title="">text/plain</code></td> </tr> <tr> <td>74 65 78 74 2f 70 6c 61 69 6e 3b 20 63 68 61 72 73 65 74 3d 49 53 4f 2d 38 38 35 39 2d 31</td> <td><code title="">text/plain; charset=ISO-8859-1</code></td> </tr> <tr> <td>74 65 78 74 2f 70 6c 61 69 6e 3b 20 63 68 61 72 73 65 74 3d 69 73 6f 2d 38 38 35 39 2d 31</td> <td><code title="">text/plain; charset=iso-8859-1</code></td> </tr> <tr> <td><ins class="diff-new">74 65 78 74 2f 70 6c 61 69 6e 3b 20 63 68 61 72 73 65 74 3d 55 54 46 2d 38</ins></td> <td><code title=""><ins class= "diff-new">text/plain; charset=UTF-8</ins></code></td> </tr> </tbody> </table> ...then jump to the <a href= "#content-type4">text or binary</a> section below. </li> <li> <del class="diff-old">Let official type be the type given by the Content-Type metadata for the resource (in lowercase, ignoring any parameters). If there is no such type, jump to the unknown type step below.</del> If <var title="">official type</var> is "unknown/unknown" or "application/unknown", jump to the <a href= "#content-type5">unknown type</a> step below. </li> <li> If <var title="">official type</var> ends in "+xml", or if it is either "text/xml" or "application/xml", then the <del class= "diff-old">the</del> sniffed type of the resource is <var title= "">official type</var> ; return that and abort these steps. </li> <li> If <var title="">official type</var> is an image type supported by the user agent (e.g. "image/png", "image/gif", "image/jpeg", etc), then jump to the <a href= "#content-type6">images</a> section below. </li> <li> If <var title="">official type</var> is "text/html", then jump to the <a href= "#content-type7">feed or HTML</a> section below. </li> <li> <del class="diff-old">Otherwise, the</del> <ins class= "diff-chg">The</ins> sniffed type of the resource is <var title= "">official type</var> . </li> </ol> <h4 id="content-type0"><del class= "diff-old">4.9.1.</del> <ins class="diff-chg">4.10.1</ins> <dfn id="content-type4">Content-Type sniffing: text or binary</dfn></h4> <ol> <li> The user agent may wait for 512 or more bytes of the resource to be available. </li> <li> Let <var title="">n</var> be the smaller of either 512 or the number of bytes already available. </li> <li> If <var title="">n</var> is 4 or more, and the first bytes of the file match one of the following byte sets: <table> <thead> <tr> <th>Bytes in Hexadecimal</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td>FE FF</td> <td>UTF-16BE BOM <del class="diff-old">or UTF-32LE BOM</del></td> </tr> <tr> <td>FF FE</td> <td>UTF-16LE BOM</td> </tr> <tr> <td><del class="diff-old">00 00 FE FF UTF-32BE BOM</del> EF BB BF</td> <td>UTF-8 BOM</td> </tr> </tbody> </table> ...then the sniffed type of the resource is "text/plain". <del class="diff-old">Should we remove UTF-32 from the above?</del> </li> <li> Otherwise, if any of the first <var title="">n</var> bytes of the resource are in one of the following byte ranges: <ul class="brief"> <li>0x00 - 0x08</li> <li>0x0E - 0x1A</li> <li>0x1C - 0x1F</li> </ul> ...then the sniffed type of the resource is "application/octet-stream". maybe we should invoke the "Content-Type sniffing: image" section now, falling back on "application/octet-stream". </li> <li> Otherwise, the sniffed type of the resource is "text/plain". </li> </ol> <h4 id="content-type1"><del class= "diff-old">4.9.2.</del> <ins class="diff-chg">4.10.2</ins> <dfn id="content-type5">Content-Type sniffing: unknown type</dfn></h4> <ol> <li> The user agent may wait for 512 or more bytes of the resource to be available. </li> <li> Let <var title="">stream length</var> be the smaller of either 512 or the number of bytes already available. </li> <li> For each row in the table below: <dl class="switch"> <dt>If the row has no " WS " bytes:</dt> <dd> <ol> <li>Let <var title="">pattern length</var> be the length of the pattern (number of bytes described by the cell in the second column of the row).</li> <li>If <var title="">pattern length</var> is smaller than <var title="">stream length</var> then skip this row.</li> <li>Apply the "and" operator to the first <var title="">pattern length</var> bytes of the resource and the given mask (the bytes in the cell of first column of that row), and let the result be the <var title="">data</var> .</li> <li>If the bytes of the <var title="">data</var> matches the given pattern bytes exactly, then the sniffed type of the resource is the type given in the cell of the third column in that row; abort these steps.</li> </ol> </dd> <dt>If the row has a " WS " byte:</dt> <dd> <ol> <li> Let <var title="">index pattern</var> be an index into the mask and pattern byte strings of the row. </li> <li> Let <var title="">index stream</var> be an index into the byte stream being examined. </li> <li> Loop : If <var title="">index stream</var> points beyond the end of the byte stream, then this row doesn't match, skip this row. </li> <li> Examine the <var title="">index stream</var> th byte of the byte stream as follows: <dl class="switch"> <dt>If the <var title="">index stream</var> th byte of the pattern is a normal hexadecimal byte and not a " WS " byte:</dt> <dd> If the "and" operator, applied to the <var title="">index stream</var> th byte of the stream and the <var title= "">index pattern</var> th byte of the mask, yield a value different that the <var title="">index pattern</var> th byte of the pattern, then skip this row. Otherwise, increment <var title="">index pattern</var> to the next byte in the mask and pattern and <var title="">index stream</var> to the next byte in the byte stream. </dd> <dt><del class="diff-old">Otherwies,</del> <ins class= "diff-chg">Otherwise,</ins> if the <var title="">index stream</var> th byte of the pattern is a " WS " byte:</dt> <dd> " WS " means "whitespace", and allows insignificant whitespace to be skipped when sniffing for a type signature. If the <var title="">index stream</var> th byte of the stream is one of 0x09 (ASCII TAB), 0x0A (ASCII LF), 0x0B (ASCII VT), 0x0C (ASCII FF), 0x0D (ASCII CR), or 0x20 (ASCII space), then increment only the <var title="">index stream</var> to the next byte in the byte stream. Otherwise, increment only the <var title="">index pattern</var> to the next byte in the mask and pattern. </dd> </dl> </li> <li> If <var title="">index pattern</var> does not point beyond the end of the mask and pattern byte strings, then jump back to the loop step in this algorithm. </li> <li> Otherwise, the sniffed type of the resource is the type given in the cell of the third column in that row; abort these steps. </li> </ol> </dd> </dl> </li> <li> As a last-ditch effort, jump to the <a href="#content-type4" title="content-type sniffing: text or binary">text or binary</a> section. </li> </ol> <table> <thead> <tr> <th colspan="2">Bytes in Hexadecimal</th> <th rowspan="2">Sniffed type</th> <th rowspan="2">Comment</th> </tr> <tr> <th>Mask</th> <th>Pattern</th> </tr> </thead> <tbody> <tr> <td>FF FF DF DF DF DF DF DF DF FF DF DF DF DF</td> <td>3C 21 44 4F 43 54 59 50 45 20 48 54 4D 4C</td> <td>text/html</td> <td>The string " <code title=""><!DOCTYPE HTML</code> " in US-ASCII or compatible encodings, case-insensitively.</td> </tr> <tr> <td>FF FF DF DF DF DF</td> <td>WS 3C 48 54 4D 4C</td> <td>text/html</td> <td>The string " <code title=""><HTML</code> " in US-ASCII or compatible encodings, case-insensitively, possibly with leading spaces.</td> </tr> <tr> <td>FF FF DF DF DF DF</td> <td>WS 3C 48 45 41 44</td> <td>text/html</td> <td>The string " <code title=""><HEAD</code> " in US-ASCII or compatible encodings, case-insensitively, possibly with leading spaces.</td> </tr> <tr> <td>FF FF DF DF DF DF DF DF</td> <td>WS 3C 53 43 52 49 50 54</td> <td>text/html</td> <td>The string " <code title=""><SCRIPT</code> " in US-ASCII or compatible encodings, case-insensitively, possibly with leading spaces.</td> </tr> <tr> <td>FF FF FF FF FF</td> <td>25 50 44 46 2D</td> <td>application/pdf</td> <td>The string " <code title="">%PDF-</code> ", the PDF signature.</td> </tr> <tr> <td>FF FF FF FF FF FF FF FF FF FF FF</td> <td>25 21 50 53 2D 41 64 6F 62 65 2D</td> <td>application/postscript</td> <td>The string " <code title="">%!PS-Adobe-</code> ", the PostScript signature.</td> </tr> </tbody> <tbody> <tr> <td>FF FF FF FF FF FF</td> <td>47 49 46 38 37 61</td> <td>image/gif</td> <td>The string " <code title="">GIF87a</code> ", a GIF signature.</td> </tr> <tr> <td>FF FF FF FF FF FF</td> <td>47 49 46 38 39 61</td> <td>image/gif</td> <td>The string " <code title="">GIF89a</code> ", a GIF signature.</td> </tr> <tr> <td>FF FF FF FF FF FF FF FF</td> <td>89 50 4E 47 0D 0A 1A 0A</td> <td>image/png</td> <td>The PNG signature.</td> </tr> <tr> <td>FF FF FF</td> <td>FF D8 FF</td> <td>image/jpeg</td> <td>A JPEG SOI marker followed by the first byte of another marker.</td> </tr> <tr> <td>FF FF</td> <td>42 4D</td> <td>image/bmp</td> <td>The string " <code title="">BM</code> ", a BMP signature.</td> </tr> <tr> <td><ins class="diff-new">FF FF FF FF</ins></td> <td><ins class="diff-new">00 00 01 00</ins></td> <td><ins class="diff-new">image/vnd.microsoft.icon</ins></td> <td><ins class="diff-new">A 0 word following by a 1 word, a Windows Icon file format signature.</ins></td> </tr> </tbody> </table> User agents may support further types if desired, by implicitly adding to the above table. However, user agents should not use any other patterns for types already mentioned in the table above, as this could then be used for privilege escalation (where, e.g., a server uses the above table to determine that content is not HTML and thus safe from XSS attacks, but then a user agent detects it as HTML anyway and allows script to execute). <h4 id="content-type2"><del class= "diff-old">4.9.3.</del> <ins class="diff-chg">4.10.3</ins> <dfn id="content-type6">Content-Type sniffing: image</dfn></h4> If the first bytes of the file match one of the byte sequences in the first columns of the following table, then the sniffed type of the resource is the type given in the corresponding cell in the second column on the same row: <table> <thead> <tr> <th>Bytes in Hexadecimal</th> <th>Sniffed type</th> <th>Comment</th> </tr> </thead> <tbody> <tr> <td>47 49 46 38 37 61</td> <td>image/gif</td> <td>The string " <code title="">GIF87a</code> ", a GIF signature.</td> </tr> <tr> <td>47 49 46 38 39 61</td> <td>image/gif</td> <td>The string " <code title="">GIF89a</code> ", a GIF signature.</td> </tr> <tr> <td>89 50 4E 47 0D 0A 1A 0A</td> <td>image/png</td> <td>The PNG signature.</td> </tr> <tr> <td>FF D8 FF</td> <td>image/jpeg</td> <td>A JPEG SOI marker followed by the first byte of another marker.</td> </tr> <tr> <td>42 4D</td> <td>image/bmp</td> <td>The string " <code title="">BM</code> ", a BMP signature.</td> </tr> <tr> <td><ins class="diff-new">00 00 01 00</ins></td> <td><ins class="diff-new">image/vnd.microsoft.icon</ins></td> <td><ins class="diff-new">A 0 word following by a 1 word, a Windows Icon file format signature.</ins></td> </tr> </tbody> </table> User agents must ignore any rows for image types that they do not support. Otherwise, the sniffed type of the resource is the same as its <var title="">official type</var> . <h4 id="content-type3"><del class= "diff-old">4.9.4.</del> <ins class="diff-chg">4.10.4</ins> <dfn id="content-type7">Content-Type sniffing: feed or HTML</dfn></h4> <ol> <li> The user agent may wait for 512 or more bytes of the resource to be available. </li> <li> Let <var title="">s</var> be the stream of bytes, and let <var title="">s</var> [ <var title="">i</var> ] represent the byte in <var title="">s</var> with position <var title="">i</var> , treating <var title="">s</var> as zero-indexed (so the first byte is at <var title="">i</var> =0 ). </li> <li> If at any point this algorithm requires the user agent to determine the value of a byte in <var title="">s</var> which is not yet available, or which is past the first 512 bytes of the resource, or which is beyond the end of the resource, the user agent must stop this algorithm, and assume that the sniffed type of the resource is "text/html". User agents are allowed, by the first step of this algorithm, to wait until the first 512 bytes of the resource are available. </li> <li> Initialise <var title="">pos</var> to 0. </li> <li> <ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">s</ins></var> <ins class="diff-new">[0]</ins> <ins class="diff-new">is 0xEF,</ins> <var title= ""><ins class="diff-new">s</ins></var> <ins class= "diff-new">[1]</ins> <ins class="diff-new">is 0xBB, and</ins> <var title=""><ins class="diff-new">s</ins></var> <ins class="diff-new">[2]</ins> <ins class="diff-new">is 0xBF, then set</ins> <var title=""><ins class= "diff-new">pos</ins></var> <ins class="diff-new">to 3. (This skips over a leading UTF-8 BOM, if any.)</ins> </li> <li> <ins class="diff-new">Loop start:</ins> Examine <var title="">s</var> [ <var title="">pos</var> ] . <dl class="switch"> <dt>If it is 0x09 (ASCII tab), 0x20 (ASCII space), 0x0A (ASCII LF), or 0x0D (ASCII CR)</dt> <dd>Increase <var title="">pos</var> by 1 and repeat this step.</dd> <dt>If it is 0x3C (ASCII " <code title=""><</code> ")</dt> <dd>Increase <var title="">pos</var> by 1 and go to the next step.</dd> <dt>If it is anything else</dt> <dd>The sniffed type of the resource is "text/html". Abort these steps.</dd> </dl> </li> <li> If the bytes with positions <var title="">pos</var> to <var title="">pos</var> +2 in <var title="">s</var> are exactly equal to 0x21, 0x2D, 0x2D respectively (ASCII for " <code title="">!--</code> "), then: <ol> <li>Increase <var title="">pos</var> by 3.</li> <li>If the bytes with positions <var title= "">pos</var> to <var title="">pos</var> +2 in <var title="">s</var> are exactly equal to 0x2D, 0x2D, 0x3E respectively (ASCII for " <code title="">--></code> "), then increase <var title="">pos</var> by 3 and jump back to the previous step <del class="diff-old">(step 5)</del> <ins class= "diff-chg">(the step labeled</ins> <ins class="diff-chg">loop start</ins> <ins class="diff-chg">)</ins> in the overall algorithm in this section.</li> <li>Otherwise, increase <var title="">pos</var> by 1.</li> <li><del class="diff-old">Otherwise, return</del> <ins class= "diff-chg">Return</ins> to step 2 in these substeps.</li> </ol> </li> <li> If <var title="">s</var> [ <var title="">pos</var> ] is 0x21 (ASCII " <code title="">!</code> "): <ol> <li>Increase <var title="">pos</var> by 1.</li> <li>If <var title="">s</var> [ <var title="">pos</var> ] equal 0x3E, then increase <var title="">pos</var> by 1 and jump back to <ins class="diff-new">the</ins> step <del class= "diff-old">5</del> <ins class="diff-chg">labeled</ins> <ins class="diff-chg">loop start</ins> in the overall algorithm in this section.</li> <li>Otherwise, return to step 1 in these substeps.</li> </ol> </li> <li> If <var title="">s</var> [ <var title="">pos</var> ] is 0x3F (ASCII " <code title="">?</code> "): <ol> <li>Increase <var title="">pos</var> by 1.</li> <li>If <var title="">s</var> [ <var title="">pos</var> ] and <var title="">s</var> [ <var title="">pos</var> +1] equal 0x3F and 0x3E respectively, then increase <var title="">pos</var> by 1 and jump back to <ins class= "diff-new">the</ins> step <del class="diff-old">5</del> <ins class= "diff-chg">labeled</ins> <ins class="diff-chg">loop start</ins> in the overall algorithm in this section.</li> <li>Otherwise, return to step 1 in these substeps.</li> </ol> </li> <li> Otherwise, if the bytes in <var title="">s</var> starting at <var title="">pos</var> match any of the sequences of bytes in the first column of the following table, then the user agent must follow the steps given in the corresponding cell in the second column of the same row. <table> <thead> <tr> <th>Bytes in Hexadecimal</th> <th>Requirement</th> <th>Comment</th> </tr> </thead> <tbody> <tr> <td>72 73 73</td> <td>The sniffed type of the resource is "application/rss+xml"; abort these steps</td> <td>The three ASCII characters " <code title="">rss</code> "</td> </tr> <tr> <td>66 65 65 64</td> <td>The sniffed type of the resource is "application/atom+xml"; abort these steps</td> <td>The four ASCII characters " <code title="">feed</code> "</td> </tr> <tr> <td>72 64 66 3A 52 44 46</td> <td>Continue to the next step in this algorithm</td> <td>The ASCII characters " <code title="">rdf:RDF</code> "</td> </tr> </tbody> </table> If none of the byte sequences above match the bytes in <var title="">s</var> starting at <var title="">pos</var> , then the sniffed type of the resource is "text/html". Abort these steps. </li> <li> If, before the next "> ", you find two xmlns* attributes with http://www.w3.org/1999/02/22-rdf-syntax-ns# and http://purl.org/rss/1.0/ as the namespaces, then the sniffed type of the resource is "application/rss+xml", abort these steps. (maybe we only need to check for http://purl.org/rss/1.0/ actually) </li> <li> Otherwise, the sniffed type of the resource is "text/html". </li> </ol> For efficiency <del class="diff-old">reaons,</del> <ins class="diff-chg">reasons,</ins> implementations may wish to implement this algorithm and the algorithm for detecting the character encoding of HTML documents in parallel. <h4 id="content-type"><del class= "diff-old">4.9.5.</del> <ins class="diff-chg">4.10.5</ins> Content-Type metadata</h4> What explicit <dfn id="content-type8" title= "Content-Type">Content-Type metadata</dfn> is associated with the resource (the resource's type information) depends on the protocol that was used to fetch the resource. For HTTP resources, only the <ins class="diff-new">first</ins> Content-Type HTTP <del class="diff-old">header</del> <ins class= "diff-chg">header, if any,</ins> contributes any <del class= "diff-old">data;</del> <ins class="diff-chg">type information;</ins> the explicit type of the resource is then the value of that header, interpreted as described by the HTTP specifications. If the Content-Type HTTP header is present but <del class="diff-old">it</del> <ins class="diff-chg">the value of the first such header</ins> cannot be interpreted as described by the HTTP specifications (e.g. because its value doesn't contain a U+002F SOLIDUS ('/') character), then the resource has no type <del class="diff-old">information.</del> <ins class= "diff-chg">information (even if there are multiple Content-Type HTTP headers and one of the other ones is syntactically correct).</ins> <a href="#references">[HTTP]</a> For resources fetched from the <del class= "diff-old">filesystem,</del> <ins class="diff-chg">file system,</ins> user agents should use platform-specific conventions, e.g. operating system extension/type mappings. Extensions must not be used for determining resource types for resources fetched over HTTP. For resources fetched over most other protocols, e.g. FTP, there is no type information. The <dfn id="algorithm4">algorithm for extracting an encoding from a Content-Type</dfn> , given a string <var title="">s</var> , is as follows. It either returns <del class="diff-old">a</del> <ins class="diff-chg">an</ins> encoding or nothing. <ol> <li> <del class="diff-old">Skip</del> <ins class="diff-chg">Find the first seven</ins> characters in <var title="">s</var> <del class= "diff-old">up to and including the first U+003B SEMICOLON ( ; ) character. Skip any U+0009, U+000A, U+000B, U+000C, U+000D, or U+0020 characters (i.e. spaces)</del> that <del class= "diff-old">immediately follow</del> <ins class="diff-chg">are a case-insensitive match for</ins> the <del class= "diff-old">semicolon.</del> <ins class="diff-chg">word 'charset'.</ins> If <del class="diff-old">the next six characters are not 'charset',</del> <ins class="diff-chg">no such match is found,</ins> return nothing. </li> <li> Skip any U+0009, U+000A, U+000B, U+000C, U+000D, or U+0020 characters that immediately follow the word 'charset' (there might not be any). </li> <li> If the next character is not a U+003D EQUALS SIGN ('='), return nothing. </li> <li> Skip any U+0009, U+000A, U+000B, U+000C, U+000D, or U+0020 characters that immediately follow the <del class= "diff-old">word</del> equals sign (there might not be any). </li> <li> Process the next character as follows: <dl class="switch"> <dt>If it is a U+0022 QUOTATION MARK ('"') and there is a later U+0022 QUOTATION MARK ('"') in <var title="">s</var> <del class= "diff-old">Return string between the two quotation marks.</del></dt> <dt>If it is a U+0027 APOSTROPHE ("'") and there is a later U+0027 APOSTROPHE ("'") in <var title="">s</var></dt> <dd> Return the string between <ins class="diff-new">this character and</ins> the <del class="diff-old">two apostrophes.</del> <ins class="diff-chg">next earliest occurrence of this character.</ins> </dd> <dt>If it is an unmatched U+0022 QUOTATION MARK ('"')</dt> <dt>If it is an unmatched U+0027 APOSTROPHE ("'")</dt> <dt><ins class="diff-new">If there is no next character</ins></dt> <dd> Return nothing. </dd> <dt>Otherwise</dt> <dd> Return the string from this character to the first U+0009, U+000A, U+000B, U+000C, U+000D, <ins class="diff-new">U+0020,</ins> or <del class="diff-old">U+0020</del> <ins class= "diff-chg">U+003B</ins> character or the end of <var title= "">s</var> , whichever comes first. </dd> </dl> </li> </ol> <ins class="diff-chg">The above algorithm is a willful violation of the HTTP specification.</ins> <a href= "#references"><ins class="diff-chg">[RFC2616]</ins></a> <h3 id="structured"><del class= "diff-old">4.10.</del> <ins class="diff-chg">4.11</ins> <del class="diff-old">Client-side session and persistent</del> <ins class="diff-chg">Structured client-side</ins> storage <del class="diff-old">of</del></h3> <h4 id="storage"><ins class= "diff-chg">4.11.1</ins> <ins class="diff-chg">Storing</ins> name/value pairs</h4> <h5 id="introduction2"><del class= "diff-old">4.10.1.</del> <ins class= "diff-chg">4.11.1.1.</ins> Introduction</h5> This section is non-normative. This specification introduces two related mechanisms, similar to HTTP session cookies <a href="#references">[RFC2965]</a> , for storing structured data on the client side. The first is designed for scenarios where the user is carrying out a single transaction, but could be carrying out multiple transactions in different windows at the same time. Cookies don't really handle this case well. For example, a user could be buying plane tickets in two different windows, using the same site. If the site used cookies to keep track of which ticket the user was buying, then as the user clicked from page to page in both windows, the ticket currently being purchased would "leak" from one window to the other, potentially causing the user to buy two tickets for the same flight without really noticing. To address this, this specification introduces the <code title= "dom-sessionStorage"><a href= "#sessionstorage">sessionStorage</a></code> DOM attribute. Sites can add data to the session storage, and it will be accessible to any page from <del class="diff-old">that origin</del> <ins class= "diff-chg">the same site</ins> opened in that window. <div class="example"> For example, a page could have a checkbox that the user ticks to indicate that he wants insurance: <pre> <label> <input type="checkbox" onchange="sessionStorage.insurance = checked"> I want insurance on this trip. </label> </pre> A later page could then check, from script, whether the user had checked the checkbox or not: <pre> if (sessionStorage.insurance) { ... } </pre> If the user had multiple windows opened on the site, each one would have its own individual copy of the session storage object. </div> The second storage mechanism is designed for storage that spans multiple windows, and lasts beyond the current session. In particular, Web applications may wish to store megabytes of user data, such as entire user-authored documents or a user's mailbox, on the <del class="diff-old">clientside</del> <ins class= "diff-chg">client side</ins> for performance reasons. Again, cookies do not handle this case well, because they are transmitted with every request. The <code title="dom-localStorage"><del class= "diff-old">globalStorage</del> <a href="#localstorage"><ins class= "diff-chg">localStorage</ins></a></code> DOM attribute is used to access a page's <del class="diff-old">global</del> <ins class= "diff-chg">local</ins> storage area. <div class="example"> The site at example.com can display a count of how many times the user has loaded its page by putting the following at the bottom of its page: <pre> <p> You have viewed this page <span id="count">an untold number of time(s). </p> <script> <del class="diff-old"> if (!globalStorage.pageLoadCount) globalStorage.pageLoadCount = 0; globalStorage.pageLoadCount = parseInt(globalStorage.pageLoadCount, 10) + 1; document.getElementById('count').textContent = globalStorage.pageLoadCount; </del> <ins class="diff-chg"> if (!localStorage.pageLoadCount) localStorage.pageLoadCount = 0; localStorage.pageLoadCount = parseInt(localStorage.pageLoadCount, 10) + 1; document.getElementById('count').textContent = localStorage.pageLoadCount; </ins> </script> </pre></div> Each <del class="diff-old">origin</del> <ins class= "diff-chg">site</ins> has its own separate storage area. Storage areas (both session storage and <del class= "diff-old">global</del> <ins class="diff-chg">local</ins> storage) store strings. To store structured data in a storage area, you must first convert it to a string. <h5 id="the-storage"><del class= "diff-old">4.10.2.</del> <ins class= "diff-chg">4.11.1.2.</ins> The <code><a href= "#storage0">Storage</a></code> interface <del class= "diff-old">interface { readonly attribute unsigned long ; DOMString (in unsigned long index); DOMString (in DOMString key); void (in DOMString key, in DOMString data); void (in DOMString key);</del></h5> <pre class="idl"> interface <dfn id="storage0">Storage</dfn> { <ins class="diff-chg"> readonly attribute unsigned long <a href= "#length9" title="dom-Storage-length">length</a>; [IndexGetter] DOMString <a href="#keyn" title= "dom-Storage-key">key</a>(in unsigned long index); [NameGetter] DOMString <a href="#getitem" title= "dom-Storage-getItem">getItem</a>(in DOMString key); [NameSetter] void <a href="#setitem" title= "dom-Storage-setItem">setItem</a>(in DOMString key, in DOMString data); [XXX] void <a href="#removeitem" title= "dom-Storage-removeItem">removeItem</a>(in DOMString key); void <a href="#clear0" title="dom-Storage-clear">clear</a>(); </ins> }; </pre> Each <code><a href="#storage0">Storage</a></code> object provides access to a list of key/value pairs, which are sometimes called items. Keys and values are strings. Any string (including the empty string) is a valid key. To store more structured data, authors may consider using the <a href="#sql">SQL interfaces</a> instead. Each <code><a href="#storage0">Storage</a></code> object is associated with a list of key/value pairs when it is created, as defined in the sections on the <code title= "dom-sessionStorage"><a href= "#sessionstorage">sessionStorage</a></code> and <code title= "dom-localStorage"><del class="diff-old">globalStorage</del> <a href="#localstorage"><ins class= "diff-chg">localStorage</ins></a></code> attributes. Multiple separate objects implementing the <code><a href= "#storage0">Storage</a></code> interface can all be associated with the same list of key/value pairs simultaneously. The <dfn id="length9" title= "dom-Storage-length"><code>length</code></dfn> attribute must return the number of key/value pairs currently present in the list associated with the object. The <dfn id="keyn" title="dom-Storage-key"><code>key( <var title="">n</var> )</code></dfn> method must return the name of the <var title="">n</var> th key in the list. The order of keys is user-agent defined, but must be consistent within an object between changes to the number of keys. (Thus, <a href="#setitem" title= "dom-Storage-setItem">adding</a> or <a href="#removeitem" title= "dom-Storage-removeItem">removing</a> a key may change the order of the keys, but merely changing the value of an existing key must not.) If <var title="">n</var> is less than zero or greater than or equal to the number of key/value pairs in the object, then this method must raise an <code>INDEX_SIZE_ERR</code> exception. The <dfn id="getitem" title="dom-Storage-getItem"><code>getItem( <var title="">key</var> )</code></dfn> method must return the current value associated with the given <var title="">key</var> . If the given <var title="">key</var> does not exist in the list associated with the object then this method must return null. The <dfn id="setitem" title="dom-Storage-setItem"><code>setItem( <var title="">key</var> , <var title="">value</var> )</code></dfn> method must first check if a key/value pair with the given <var title="">key</var> already exists in the list associated with the object. If it does not, then a new key/value pair must be added to the list, with the given <var title="">key</var> and <var title= "">value</var> . If the given <var title="">key</var> does exist in the list, then it must have its value updated to the value given in the <var title="">value</var> argument. <del class="diff-old">When</del> <ins class="diff-chg">If it couldn't set the new value,</ins> the <del class= "diff-old">setItem()</del> method <del class="diff-old">is invoked, events are fired on other</del> <ins class="diff-chg">must raise an</ins> <code><del class="diff-old">HTMLDocument</del> <ins class= "diff-chg">INVALID_ACCESS_ERR</ins></code> <del class= "diff-old">objects that can access</del> <ins class= "diff-chg">exception. (Setting could fail if, e.g.,</ins> the <del class="diff-old">newly stored data, as defined in</del> <ins class="diff-chg">user has disabled storage for</ins> the <del class="diff-old">sections on</del> <ins class= "diff-chg">domain, or if</ins> the <del class= "diff-old">sessionStorage and globalStorage attributes.</del> <ins class="diff-chg">quota has been exceeded.)</ins> The <dfn id="removeitem" title= "dom-Storage-removeItem"><code>removeItem( <var title="">key</var> )</code></dfn> method must cause the key/value pair with the given <var title="">key</var> to be removed from the list associated with the object, if it exists. If no item with that key exists, the method must do nothing. The <code title="dom-Storage-setItem"><a href= "#setitem">setItem()</a></code> and <code title= "dom-Storage-removeItem"><a href= "#removeitem">removeItem()</a></code> methods must be atomic with respect to failure. That is, changes to the data storage area must either be successful, or the data storage area must not be changed at all. <del class="diff-old">In the ECMAScript DOM binding, enumerating a Storage</del> <ins class="diff-chg">The</ins> <dfn id="clear0" title="dom-Storage-clear"><code><ins class= "diff-new">clear()</ins></code> <del class= "diff-old">object</del></dfn> <ins class="diff-chg">method</ins> must <del class="diff-old">enumerate through the currently stored keys in</del> <ins class="diff-chg">atomically cause</ins> the list <del class="diff-old">the object is</del> associated <del class= "diff-old">with. (It must not enumerate the values or</del> <ins class="diff-chg">with</ins> the <del class="diff-old">actual members</del> <ins class="diff-chg">object to be emptied</ins> of <ins class="diff-new">all key/value pairs.</ins> <ins class="diff-new">When</ins> the <del class= "diff-old">interface). In the ECMAScript DOM binding,</del> <code title="dom-Storage-setItem"><del class= "diff-old">Storage</del> <a href="#setitem"><ins class= "diff-chg">setItem()</ins></a> <del class="diff-old">objects must support dereferencing such that getting a property that is not a member of the object (i.e. is neither a member of the</del></code> , <code title="dom-Storage-removeItem"><del class= "diff-old">Storage</del> <a href="#removeitem"><ins class= "diff-chg">removeItem()</ins></a></code> ,<ins class= "diff-chg">and</ins> <code title="dom-Storage-clear"><a href= "#clear0"><ins class="diff-chg">clear()</ins></a></code> <del class="diff-old">interface nor of Object ) must invoke the</del> <ins class="diff-chg">methods are invoked, events are fired on other</ins> <code><del class="diff-old">getItem()</del> <a href="#htmldocument"><ins class= "diff-chg">HTMLDocument</ins></a></code> <del class= "diff-old">method with</del> <ins class="diff-chg">objects that can access</ins> the <del class="diff-old">property's name</del> <ins class="diff-chg">newly stored or removed data,</ins> as <ins class="diff-new">defined in</ins> the <del class= "diff-old">argument, and setting such a property must invoke</del> <ins class="diff-chg">sections on</ins> the <code title= "dom-sessionStorage"><del class="diff-old">setItem()</del> <a href= "#sessionstorage"><ins class= "diff-chg">sessionStorage</ins></a></code> <del class= "diff-old">method with the property's name as the first argument</del> and <del class="diff-old">the given value as the second argument.</del> <code title="dom-localStorage"><a href= "#localstorage"><ins class="diff-chg">localStorage</ins></a></code> <ins class="diff-chg">attributes.</ins> <h5 id="the-sessionstorage"><del class= "diff-old">4.10.3.</del> <ins class= "diff-chg">4.11.1.3.</ins> The <code title= "dom-sessionStorage"><a href= "#sessionstorage">sessionStorage</a></code> attribute</h5> The <dfn id="sessionstorage" title= "dom-sessionStorage"><code>sessionStorage</code></dfn> attribute represents the set of storage areas specific to the current <a href="#top-level">top-level browsing context</a> . Each <a href="#top-level">top-level browsing context</a> has a unique set of session storage areas, one for each <a href= "#origin0">origin</a> . User agents should not expire data from a browsing context's session storage areas, but may do so when the user requests that such data be deleted, or when the UA detects that it has limited storage space, or for security reasons. User agents should always avoid deleting data while a script that could access that data is running. When a top-level browsing context is destroyed (and therefore permanently inaccessible to the user) the data stored in its session storage areas can be discarded with it, as the API described in this specification provides no way for that data to ever be subsequently retrieved. The lifetime of a browsing context can be unrelated to the lifetime of the actual user agent process itself, as the user agent may support resuming sessions after a restart. When a new <code><a href="#htmldocument">HTMLDocument</a></code> is created, the user agent must check to see if the document's <a href="#top-level">top-level browsing context</a> has allocated a session storage area for that document's <a href= "#origin0">origin</a> . If it has not, a new storage area for that document's <a href="#origin0">origin</a> must be created. The <code><a href="#storage0">Storage</a></code> object for the document's associated <code><a href="#window">Window</a></code> object's <code title="dom-sessionStorage"><a href= "#sessionstorage">sessionStorage</a></code> attribute must then be associated with that <a href="#origin0">origin</a> 's session storage area for that <a href="#top-level">top-level browsing context</a> . When a new <a href="#top-level">top-level browsing context</a> is created by cloning an existing <a href="#browsing1">browsing context</a> , the new browsing context must start with the same session storage areas as the original, but the two sets must from that point on be considered separate, not affecting each other in any way. When a new <a href="#top-level">top-level browsing context</a> is created by a script in an existing <a href="#browsing1">browsing context</a> , or by the user following a link in an existing browsing context, or in some other way related to a specific <code><a href="#htmldocument">HTMLDocument</a></code> , then the session storage area of the <a href="#origin0">origin</a> of that <code><a href="#htmldocument">HTMLDocument</a></code> must be copied into the new browsing context when it is created. From that point on, however, the two session storage areas must be considered separate, not affecting each other in any way. When the <code title= "dom-Storage-setItem"><a href="#setitem">setItem()</a></code> , <code title="dom-Storage-removeItem"><a href= "#removeitem"><ins class="diff-new">removeItem()</ins></a></code> ,<ins class="diff-new">and</ins> <code title= "dom-Storage-clear"><a href="#clear0"><ins class= "diff-new">clear()</ins></a></code> <del class="diff-old">method is</del> <ins class="diff-chg">methods are</ins> called on a <code><a href="#storage0">Storage</a></code> object <var title= "">x</var> that is associated with a session storage area, then in every <code><a href="#htmldocument">HTMLDocument</a></code> object whose <code><a href="#window">Window</a></code> object's <code title="dom-sessionStorage"><a href= "#sessionstorage">sessionStorage</a></code> attribute's <code><a href="#storage0">Storage</a></code> object is associated with the same storage area, other than <var title="">x</var> , a <code title="event-storage"><a href="#storage1">storage</a></code> event must be fired, as <a href="#storage1" title= "event-storage">described below</a> . <h5 id="the-localstorage"><del class= "diff-old">4.10.4.</del> <ins class= "diff-chg">4.11.1.4.</ins> The <code title= "dom-localStorage"><del class="diff-old">globalStorage</del> <a href="#localstorage"><ins class= "diff-chg">localStorage</ins></a></code> attribute</h5> The <dfn id="localstorage" title= "dom-localStorage"><code><del class="diff-old">globalStorage</del> <ins class="diff-chg">localStorage</ins></code></dfn> object provides a <code><a href="#storage0">Storage</a></code> object for <ins class="diff-new">an</ins> <a href="#origin0">origin</a> . User agents must have a set of <del class= "diff-old">global</del> <ins class="diff-chg">local</ins> storage areas, one for each <a href="#origin0">origin</a> . User agents should <del class="diff-old">only</del> expire data from the <del class="diff-old">global</del> <ins class= "diff-chg">local</ins> storage areas <ins class= "diff-new">only</ins> for security reasons or when requested to do so by the user. User agents should always avoid deleting data while a script that could access that data is running. Data stored in <del class="diff-old">global</del> <ins class= "diff-chg">local</ins> storage areas should be considered potentially user-critical. It is expected that Web applications will use the <del class="diff-old">global</del> <ins class= "diff-chg">local</ins> storage areas for storing user-written documents. When the <code title="dom-localStorage"><del class= "diff-old">globalStorage</del> <a href="#localstorage"><ins class= "diff-chg">localStorage</ins></a></code> attribute is accessed, the user agent must check to see if it has allocated <del class= "diff-old">global</del> <ins class="diff-chg">local</ins> storage area for the <a href="#origin0">origin</a> of the <a href= "#browsing1">browsing context</a> within which the script is running. If it has not, a new storage area for that <a href= "#origin0">origin</a> must be created. The user agent must then create a <code><a href= "#storage0">Storage</a></code> object associated with that origin's <del class="diff-old">global</del> <ins class= "diff-chg">local</ins> storage area, and return it. When the <code title= "dom-Storage-setItem"><a href="#setitem">setItem()</a></code> , <code title="dom-Storage-removeItem"><a href= "#removeitem"><ins class="diff-new">removeItem()</ins></a></code> ,<ins class="diff-new">and</ins> <code title= "dom-Storage-clear"><a href="#clear0"><ins class= "diff-new">clear()</ins></a></code> <del class="diff-old">method is</del> <ins class="diff-chg">methods are</ins> called on a <code><a href="#storage0">Storage</a></code> object <var title= "">x</var> that is associated with a <del class= "diff-old">global</del> <ins class="diff-chg">local</ins> storage area, then in every <code><a href= "#htmldocument">HTMLDocument</a></code> object whose <code><a href= "#window">Window</a></code> object's <code title= "dom-localStorage"><del class="diff-old">globalStorage</del> <a href="#localstorage"><ins class= "diff-chg">localStorage</ins></a></code> attribute's <code><a href= "#storage0">Storage</a></code> object is associated with the same storage area, other than <var title="">x</var> , a <code title= "event-storage"><a href="#storage1">storage</a></code> event must be fired, as <a href="#storage1" title="event-storage">described below</a> . <h5 id="the-storage0"><del class= "diff-old">4.10.5.</del> <ins class= "diff-chg">4.11.1.5.</ins> The <code title= "event-storage"><a href="#storage1">storage</a></code> event</h5> The <dfn id="storage1" title= "event-storage"><code>storage</code></dfn> event is fired in an <code><a href="#htmldocument">HTMLDocument</a></code> when a storage area changes, as described in the previous two sections ( <a href="#sessionStorageEvent">for session storage</a> , <a href= "#localStorageEvent">for <del class="diff-old">global</del> <ins class="diff-chg">local</ins> storage</a> ). When this happens, the user agent must <del class= "diff-old">fire a simple</del> <ins class="diff-chg">dispatch an</ins> event <del class="diff-old">called</del> <ins class= "diff-chg">with the name</ins> <code><a href= "#storage0">storage</a> <del class="diff-old">on</del></code> , <ins class="diff-chg">with no namespace, which does not bubble but is cancelable, and which uses the</ins> <code><a href= "#storageevent"><ins class="diff-chg">StorageEvent</ins></a></code> ,<ins class="diff-chg">at</ins> <a href="#the-body1">the body element <del class="diff-old">. However, it is possible (indeed, for session storage areas, likely) that the target's</del></a> <ins class="diff-chg">of each</ins> <a href="#active" title= "active document"><ins class="diff-chg">active</ins></a> <code><a href="#htmldocument">HTMLDocument</a></code> object <ins class="diff-new">affected.</ins> <ins class="diff-new">If the event</ins> is <del class= "diff-old">not</del> <ins class="diff-chg">being fired due to</ins> an <del class="diff-old">active document</del> <ins class= "diff-chg">invocation of the</ins> <code title= "dom-Storage-setItem"><a href="#setitem"><ins class= "diff-chg">setItem()</ins></a> <del class="diff-old">at that time. In such cases,</del></code> <ins class="diff-chg">or</ins> <code title="dom-Storage-removeItem"><a href= "#removeitem"><ins class="diff-chg">removeItem()</ins></a></code> <ins class="diff-chg">methods,</ins> the <del class="diff-old">user agent</del> <ins class="diff-chg">event</ins> must <del class= "diff-old">instead delay</del> <ins class="diff-chg">have its</ins> <code title="dom-StorageEvent-key"><a href="#key"><ins class= "diff-chg">key</ins></a></code> <ins class="diff-chg">attribute set to</ins> the <del class="diff-old">firing</del> <ins class= "diff-chg">name</ins> of the <del class="diff-old">event until such time as the</del> <ins class="diff-chg">key in question, its</ins> <code title="dom-StorageEvent-oldValue"><del class= "diff-old">HTMLDocument</del> <a href="#oldvalue"><ins class= "diff-chg">oldValue</ins></a></code> <del class= "diff-old">object</del> <ins class="diff-chg">attribute set to the old value of the key</ins> in <del class="diff-old">question becomes an active document again.</del> <ins class= "diff-chg">question, or null if the key is newly added, and its</ins> <code title="dom-StorageEvent-newValue"><ins class= "diff-chg">newValue</ins></code> <ins class="diff-chg">attribute set to the new value of the key in question, or null if the key was removed.</ins> <del class="diff-old">When there are multiple delayed</del> <ins class="diff-chg">Otherwise, if the event is being fired due to an invocation of the</ins> <code title= "dom-Storage-clear"><del class="diff-old">storage</del> <a href= "#clear0"><ins class="diff-chg">clear()</ins></a></code> <del class="diff-old">events for</del> <ins class= "diff-chg">method,</ins> the <del class="diff-old">same</del> <ins class="diff-chg">event must have its</ins> <code title= "dom-StorageEvent-key"><del class="diff-old">HTMLDocument</del> <a href="#key"><ins class="diff-chg">key</ins></a></code> , <code title="dom-StorageEvent-oldValue"><a href= "#oldvalue"><ins class="diff-new">oldValue</ins></a></code> ,<ins class="diff-new">and</ins> <code title= "dom-StorageEvent-newValue"><ins class= "diff-new">newValue</ins></code> <del class="diff-old">object, user agents must coalesce those events such that only one event fires when the document becomes active again.</del> <ins class= "diff-chg">attributes set to null.</ins> <del class="diff-old">If</del> <ins class="diff-chg">In addition,</ins> the <del class="diff-old">DOM</del> <ins class= "diff-chg">event must have its</ins> <code title= "dom-StorageEvent-uri"><a href="#uri"><ins class= "diff-chg">uri</ins></a></code> <ins class="diff-chg">attribute set to the address</ins> of <del class="diff-old">a</del> <ins class= "diff-chg">the</ins> page <del class="diff-old">that has delayed</del> <ins class="diff-chg">whose</ins> <code><a href= "#storage0"><del class="diff-old">storage</del> <ins class= "diff-chg">Storage</ins></a></code> <del class="diff-old">events queued up</del> <ins class="diff-chg">object was affected, and its</ins> <code title="dom-StorageEvent-source"><a href= "#source1"><ins class="diff-chg">source</ins></a></code> <ins class="diff-chg">attribute set to the</ins> <code><a href= "#window"><ins class="diff-chg">Window</ins></a></code> <ins class= "diff-chg">object of the</ins> <a href="#browsing1"><ins class= "diff-chg">browsing context</ins></a> <ins class="diff-chg">that that document</ins> is <del class="diff-old">discarded , then</del> <ins class="diff-chg">in, if</ins> the <del class= "diff-old">delayed events</del> <ins class="diff-chg">two documents</ins> are <del class="diff-old">dropped as well. 4.10.6. Miscellaneous implementation requirements for storage areas</del> <ins class="diff-chg">in the same</ins> <a href= "#unit-of"><ins class="diff-chg">unit of related browsing contexts</ins></a> ,<ins class="diff-chg">or null otherwise.</ins> <h6 id="event0"><del class= "diff-old">4.10.6.1.</del> <ins class= "diff-chg">4.11.1.5.1.</ins> <del class="diff-old">Disk space</del> <ins class="diff-chg">Event definition</ins></h6> <pre class="idl"> interface <dfn id= "storageevent">StorageEvent</dfn> : Event {<ins class="diff-chg"> readonly attribute DOMString <a href="#key" title= "dom-StorageEvent-key">key</a>; readonly attribute DOMString <a href="#oldvalue" title= "dom-StorageEvent-oldValue">oldValue</a>; readonly attribute DOMString newValue; readonly attribute DOMString <a href="#uri" title= "dom-StorageEvent-uri">uri</a>; readonly attribute <a href="#window">Window</a> <a href= "#source1" title="dom-StorageEvent-source">source</a>; void <a href="#initstorageevent" title= "dom-StorageEvent-initStorageEvent">initStorageEvent</a>(in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMString keyArg, in DOMString oldValueArg, in DOMString newValueArg, in DOMString uriArg, in Window sourceArg); void <a href="#initstorageeventns" title= "dom-StorageEvent-initStorageEventNS">initStorageEventNS</a>(in DOMString namespaceURI, in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMString keyArg, in DOMString oldValueArg, in DOMString newValueArg, in DOMString uriArg, in Window sourceArg); }; </ins> </pre> <del class="diff-old">User agents should limit</del> <ins class= "diff-chg">The</ins> <dfn id="initstorageevent" title= "dom-StorageEvent-initStorageEvent"><code><ins class= "diff-chg">initStorageEvent()</ins></code></dfn> <ins class= "diff-chg">and</ins> <dfn id="initstorageeventns" title= "dom-StorageEvent-initStorageEventNS"><code><ins class= "diff-chg">initStorageEventNS()</ins></code></dfn> <ins class= "diff-chg">methods must initialise</ins> the <del class= "diff-old">total amount of space allowed for</del> <ins class= "diff-chg">event in</ins> a <del class="diff-old">storage area based on</del> <ins class="diff-chg">manner analogous to</ins> the <del class="diff-old">domain of</del> <ins class= "diff-chg">similarly-named methods in</ins> the <del class= "diff-old">page setting</del> <ins class="diff-chg">DOM3 Events interfaces.</ins> <a href="#references"><ins class= "diff-chg">[DOM3EVENTS]</ins></a> <ins class="diff-chg">The</ins> <dfn id="key" title= "dom-StorageEvent-key"><code><ins class= "diff-chg">key</ins></code></dfn> <ins class="diff-chg">attribute represents</ins> the <del class="diff-old">value.</del> <ins class= "diff-chg">key being changed.</ins> <del class="diff-old">User agents should not limit</del> <ins class="diff-chg">The</ins> <dfn id="oldvalue" title= "dom-StorageEvent-oldValue"><code><ins class= "diff-chg">oldValue</ins></code></dfn> <ins class= "diff-chg">attribute represents</ins> the <del class= "diff-old">total amount</del> <ins class="diff-chg">old value</ins> of <del class="diff-old">space allowed on a per-storage-area basis, otherwise a site could just store data in any number</del> <ins class="diff-chg">the key being changed.</ins> <ins class="diff-chg">The</ins> <dfn id="newvalue" title= "dom-StorageEvent-vnewValue"><code><ins class= "diff-chg">newValue</ins></code></dfn> <ins class= "diff-chg">attribute represents the new value</ins> of <del class= "diff-old">subdomains or ports, e.g. storing up to</del> the <del class="diff-old">limit in a1.example.com, a2.example.com, a3.example.com, etc, circumventing per-domain limits.</del> <ins class="diff-chg">key being changed.</ins> <del class="diff-old">User agents may prompt</del> <ins class= "diff-chg">The</ins> <dfn id="uri" title= "dom-StorageEvent-uri"><code><ins class= "diff-chg">uri</ins></code></dfn> <ins class="diff-chg">attribute represents</ins> the <del class="diff-old">user when per-domain space quotas are reached, allowing</del> <ins class= "diff-chg">address of</ins> the <del class="diff-old">user to grant a site more space. This enables sites to store many user-created documents on</del> <ins class="diff-chg">document that changed</ins> the <del class="diff-old">user's computer, for instance. User agents should allow users to see how much space each domain is using.</del> <ins class="diff-chg">key.</ins> <del class="diff-old">If</del> <ins class="diff-chg">The</ins> <dfn id="source1" title="dom-StorageEvent-source"><code><ins class= "diff-chg">source</ins></code></dfn> <ins class= "diff-chg">attribute represents</ins> the <del class= "diff-old">storage area space limit is reached during a</del> <code><del class="diff-old">setItem()</del> <a href= "#window"><ins class="diff-chg">Window</ins></a></code> <del class= "diff-old">call,</del> <ins class="diff-chg">that changed</ins> the <del class="diff-old">user agent must raise an INVALID_ACCESS_ERR exception. A mostly arbitrary limit of five megabytes per domain is recommended. Implementation feedback is welcome and will be used to update this suggestion in future.</del> <ins class= "diff-chg">key.</ins> <h5 id="threads0"><del class= "diff-old">4.10.6.2.</del> <ins class= "diff-chg">4.11.1.6.</ins> Threads</h5> Multiple browsing contexts must be able to access the <del class="diff-old">global</del> <ins class= "diff-chg">local</ins> storage areas simultaneously in a predictable manner. Scripts must not be able to detect any concurrent script execution. This is required to <del class="diff-old">guarentee</del> <ins class="diff-chg">guarantee</ins> that the <code title= "dom-Storage-length"><a href="#length9">length</a></code> attribute of a <code><a href="#storage0">Storage</a></code> object never changes while a script is executing, other than in a way that is predictable by the script itself. There are various ways of implementing this requirement. One is that if a script running in one browsing context accesses a <del class="diff-old">global</del> <ins class= "diff-chg">local</ins> storage area, the UA blocks scripts in other browsing contexts when they try to access the <del class= "diff-old">global</del> <ins class="diff-chg">local</ins> storage area for the <a href="#same-origin">same origin</a> until the first script has executed to completion. (Similarly, when a script in one browsing context accesses its session storage area, any scripts that have the same top level browsing context and the <a href= "#same-origin">same origin</a> would block when accessing their session storage area until the first script has executed to completion.) Another (potentially more efficient but probably more complex) implementation strategy is to use optimistic transactional script execution. This specification does not require any particular implementation strategy, so long as the requirement above is met. <del class="diff-old">4.10.7. Security and privacy 4.10.7.1. User tracking A third-party advertiser (or any entity capable of getting content distributed to multiple sites) could use a unique identifier stored in its global storage area to track a user across multiple sessions, building a profile of the user's interests to allow for highly targeted advertising. In conjunction with a site that is aware of the user's real identity (for example an e-commerce site that requires authenticated credentials), this could allow oppressive groups to target individuals with greater accuracy than in a world with purely anonymous Web usage. There are a number of techniques that can be used to mitigate the risk of user tracking: Blocking third-party storage: user agents may restrict access to the globalStorage object to scripts originating at the domain of the top-level document of the browsing context . Expiring stored data: user agents may automatically delete stored data after a period of time. For example, a user agent could treat third-party global storage areas as session-only storage, deleting the data once the user had closed all the browsing contexts that could access it. This can restrict the ability of a site to track a user, as the site would then only be able to track the user across multiple sessions when he authenticates with the site itself (e.g. by making a purchase or logging in to a service). However, this also puts the user's data at risk. Treating persistent storage as cookies: user agents may present the persistent storage feature to the user in a way that does not distinguish it from HTTP session cookies. [RFC2965] This might encourage users to view persistent storage with healthy suspicion. Site-specific white-listing of access to global storage areas: user agents may allow sites to access session storage areas in an unrestricted manner, but require the user to authorise access to global storage areas. Origin-tracking of persistent storage data: user agents may record the origins of sites that contained content from third-party origins that caused data to be stored. If this information is then used to present the view of data currently in persistent storage, it would allow the user to make informed decisions about which parts of the persistent storage to prune. Combined with a blacklist ("delete this data and prevent this domain from ever storing data again"), the user can restrict the use of persistent storage to sites that he trusts. Shared blacklists: user agents may allow users to share their persistent storage domain blacklists. This would allow communities to act together to protect their privacy. While these suggestions prevent trivial use of this API for user tracking, they do not block it altogether. Within a single domain, a site can continue to track the user during a session, and can then pass all this information to the third party along with any identifying information (names, credit card numbers, addresses) obtained by the site. If a third party cooperates with multiple sites to obtain such information, a profile can still be created. However, user tracking is to some extent possible even with no cooperation from the user agent whatsoever, for instance by using session identifiers in URIs, a technique already commonly used for innocuous purposes but easily repurposed for user tracking (even retroactively). This information can then be shared with other sites, using using visitors' IP addresses and other user-specific data (e.g. user-agent headers and configuration settings) to combine separate sessions into coherent user profiles. 4.10.7.2. Cookie resurrection If the user interface for persistent storage presents data in the persistent storage feature separately from data in HTTP session cookies, then users are likely to delete data in one and not the other. This would allow sites to use the two features as redundant backup for each other, defeating a user's attempts to protect his privacy.</del> <h4 id="sql"><del class= "diff-old">4.10.7.3.</del> <ins class= "diff-chg">4.11.2</ins> <del class="diff-old">DNS spoofing attacks Because of the potential for DNS spoofing attacks, one cannot guarentee that a host claiming to be in a certain domain really is from that domain. To mitigate this, pages can use SSL. Pages using SSL can be sure that only pages using SSL that have certificates identifying them as being from the same domain can access their global</del> <ins class="diff-chg">Database</ins> storage <del class="diff-old">areas.</del></h4> <h5 id="introduction3"><del class= "diff-old">4.10.7.4.</del> <ins class= "diff-chg">4.11.2.1.</ins> <del class= "diff-old">Cross-directory attacks</del> <ins class= "diff-chg">Introduction</ins></h5> <del class="diff-old">Different authors sharing one host name, for example users hosting content on geocities.com , all share one persistent storage object. There is no feature to restrict the access by pathname. Authors on shared hosts are therefore recommended to avoid using the persistent storage feature, as it would be trivial for other authors to read from and write to the same storage area. Even if a path-restriction feature was made available, the usual DOM scripting security model would make it trivial to bypass this protection and access the data from any path.</del> <del class="diff-old">4.10.7.5. Implementation risks The two primary risks when implementing this persistent storage feature are letting hostile sites read information from other domains, and letting hostile sites write information that is then read from other domains. Letting third-party sites read data that is not supposed to be read from their domain causes</del> <del class="diff-old">information leakage , For example, a user's shopping wishlist on one domain could be used by another domain for targeted advertising; or a user's work-in-progress confidential documents stored by a word-processing site could be examined by the site of a competing company. Letting third-party sites write data to the storage areas of other domains can result in information spoofing , which is equally dangerous. For example, a hostile site could add items to a user's wishlist; or a hostile site could set a user's session identifier to a known ID that the hostile site can then use to track the user's actions on the victim site. Thus, strictly following the model described in this specification</del> <ins class="diff-chg">This section</ins> is <del class="diff-old">important for user security. 4.11. Client-side database storage 4.11.1. Introduction</del> <ins class= "diff-chg">non-normative.</ins> ... <h5 id="databases"><del class= "diff-old">4.11.2.</del> <ins class= "diff-chg">4.11.2.2.</ins> Databases</h5> Each <a href="#origin0">origin</a> has an associated set of databases. Each database has a name and a current version. There is no way to enumerate or delete the databases available for a domain from this API. Each database has one version at a time, a database can't exist in multiple versions at once. Versions are intended to allow authors to manage schema changes incrementally and non-destructively, and without running the risk of old code (e.g. in another browser window) trying to write to a database with incorrect assumptions. The <dfn id="opendatabase" title= "dom-opendatabase"><code>openDatabase()</code></dfn> method returns a <code><a href="#database0">Database</a></code> object. The method takes four arguments: a database name, a database version, a display name, and an estimated size, in bytes, of the data that will be stored in the database. <ins class="diff-new">The</ins> <code title= "dom-opendatabase"><a href="#opendatabase"><ins class= "diff-new">openDatabase()</ins></a></code> <ins class= "diff-new">method must use and create databases from the</ins> <a href="#origin0"><ins class="diff-new">origin</ins></a> <ins class="diff-new">of the</ins> <a href="#active"><ins class= "diff-new">active document</ins></a> <ins class="diff-new">of the</ins> <code><a href="#window"><ins class= "diff-new">Window</ins></a></code> <ins class="diff-new">object on which the method was invoked.</ins> If the database version provided is not the empty string, and the database already exists but has a different version, then the method must raise an <code>INVALID_STATE_ERR</code> exception. <ins class="diff-new">The user agent may also raise a</ins> <a href="#security9"><ins class="diff-new">security exception</ins></a> <ins class="diff-new">in case the request violates a policy decision (e.g. if the user agent is configured to not allow the page to open databases).</ins> Otherwise, if the database <ins class="diff-new">version</ins> provided is the empty string, or if the database doesn't yet exist, or if the database exists and the version provided to the <code title="dom-opendatabase"><a href= "#opendatabase">openDatabase()</a></code> method is the same as the current version associated with the database, then the method must return a <code><a href="#database0">Database</a></code> object representing the database <del class="diff-old">associated with the origin of the active document of the browsing context of the Window object on which the method was called</del> that has the name that was given. If no such database exists, it must be created first. All strings including the empty string are valid database names. Database names are case-sensitive. Implementations can support this even in environments that only support a subset of all strings as database names by mapping database names (e.g. using a hashing algorithm) to the supported set of names. User agents are expected to use the display name and the estimated database size to <del class="diff-old">optimise</del> <ins class="diff-chg">optimize</ins> the user experience. For example, a user agent could use the estimated size to suggest an initial quota to the user. This allows a site that is aware that it will try to use hundreds of megabytes to declare this upfront, instead of the user agent prompting the user for permission to increase the quota every five megabytes. <pre class="idl"> interface <dfn id="database0">Database</dfn> { void <a href="#transaction" title= "dom-database-transaction">transaction</a>(in <a href= "#sqltransactioncallback">SQLTransactionCallback</a> callback); void <a href="#transaction" title= "dom-database-transaction">transaction</a>(in <a href= "#sqltransactioncallback">SQLTransactionCallback</a> callback, in <a href="#sqltransactionerrorcallback">SQLTransactionErrorCallback</a> errorCallback); void <a href="#transaction" title= "dom-database-transaction">transaction</a>(in <a href= "#sqltransactioncallback">SQLTransactionCallback</a> callback, in <a href="#sqltransactionerrorcallback">SQLTransactionErrorCallback</a> errorCallback, in <a href="#voidcallback">VoidCallback</a> successCallback); readonly attribute DOMString <a href="#version" title= "dom-database-version">version</a>; void <a href="#changeversion" title= "dom-database-changeVersion">changeVersion</a>(in DOMString oldVersion, in DOMString newVersion, in <a href="#sqltransactioncallback">SQLTransactionCallback</a> callback, in <a href="#sqltransactionerrorcallback">SQLTransactionErrorCallback</a> errorCallback, in <a href="#voidcallback">VoidCallback</a> successCallback); }; interface <dfn id= "sqltransactioncallback">SQLTransactionCallback</dfn> { void handleEvent(in <a href="#sqltransaction">SQLTransaction</a> transaction); }; interface <dfn id= "sqltransactionerrorcallback">SQLTransactionErrorCallback</dfn> { <del class="diff-old"> boolean error); </del> <ins class="diff-chg"> void handleEvent(in <a href="#sqlerror">SQLError</a> error); </ins> }; </pre> The <dfn id="transaction" title= "dom-database-transaction"><code>transaction()</code></dfn> method takes one or two arguments. When called, the method must immediately return and then asynchronously run the <a href= "#transaction0">transaction steps</a> with the transaction callback being the first argument, the error callback being the second argument, if any, the success callback being the third argument, if any, and with no preflight operation or postflight operation . The version that the database was opened with is the <dfn id= "expected" title="concept-database-expected-version">expected version</dfn> of this <code><a href= "#database0">Database</a></code> object. It can be the empty string, in which case there is no expected version — any version is fine. On getting, the <dfn id="version" title= "dom-database-version"><code>version</code></dfn> attribute must return the current version of the database (as opposed to the <a href="#expected" title= "concept-database-expected-version">expected version</a> of the <code><a href="#database0">Database</a></code> object). The <dfn id="changeversion" title= "dom-database-changeVersion"><code>changeVersion()</code></dfn> method allows scripts to atomically verify the version number and change it at the same time as doing a schema update. When the method is invoked, it must immediately return, and then asynchronously run the <a href="#transaction0">transaction steps</a> with the transaction callback being the third argument, the error callback being the fourth argument, the success callback being the fifth argument, the preflight operation being the following: <ol> <li> Check that the value of the first argument to the <code title= "dom-database-changeVersion"><a href= "#changeversion">changeVersion()</a></code> method exactly matches the database's actual version. If it does not, then the preflight operation fails. </li> </ol> ...and the postflight operation being the following: <ol> <li>Change the database's actual version to the value of the second argument to the <code title="dom-database-changeVersion"><a href= "#changeversion">changeVersion()</a></code> method.</li> <li>Change the <code><a href="#database0">Database</a></code> object's expected version to the value of the second argument to the <code title="dom-database-changeVersion"><a href= "#changeversion">changeVersion()</a></code> method.</li> </ol> <h5 id="executing"><del class= "diff-old">4.11.3.</del> <ins class= "diff-chg">4.11.2.3.</ins> Executing SQL statements</h5> The <code title="dom-database-transaction"><a href= "#transaction">transaction()</a></code> and <code title= "dom-database-changeVersion"><a href= "#changeversion">changeVersion()</a></code> methods invoke callbacks with <code><a href= "#sqltransaction">SQLTransaction</a></code> objects. <pre class="idl"> typedef sequence<Object> <dfn id= "objectarray">ObjectArray</dfn>; interface <dfn id="sqltransaction">SQLTransaction</dfn> { <del class="diff-old"> void (in DOMString sqlStatement); void arguments); void callback); void errorCallback); </del> <ins class="diff-chg"> void <a href="#executesql" title= "dom-sqltransaction-executeSql">executeSql</a>(in DOMString sqlStatement); void <a href="#executesql" title= "dom-sqltransaction-executeSql">executeSql</a>(in DOMString sqlStatement, in <a href="#objectarray">ObjectArray</a> arguments); void <a href="#executesql" title= "dom-sqltransaction-executeSql">executeSql</a>(in DOMString sqlStatement, in <a href="#objectarray">ObjectArray</a> arguments, in <a href="#sqlstatementcallback">SQLStatementCallback</a> callback); void <a href="#executesql" title= "dom-sqltransaction-executeSql">executeSql</a>(in DOMString sqlStatement, in <a href="#objectarray">ObjectArray</a> arguments, in <a href="#sqlstatementcallback">SQLStatementCallback</a> callback, in <a href="#sqlstatementerrorcallback">SQLStatementErrorCallback</a> errorCallback); </ins> }; interface <dfn id= "sqlstatementcallback">SQLStatementCallback</dfn> { void handleEvent(in <a href="#sqltransaction">SQLTransaction</a> transaction, in <a href="#sqlresultset">SQLResultSet</a> resultSet); }; interface <dfn id= "sqlstatementerrorcallback">SQLStatementErrorCallback</dfn> { boolean handleEvent(in <a href="#sqltransaction">SQLTransaction</a> transaction, in <a href="#sqlerror">SQLError</a> error);Or should these arguments be the other way around? Either way we're inconsistent with _something_. What should we be consistent with? }; </pre> When the <dfn id="executesql" title= "dom-sqltransaction-executeSql"><code>executeSql( <var title= "">sqlStatement</var> , <var title="">arguments</var> , <var title= "">callback</var> , <var title="">errorCallback</var> )</code></dfn> method is invoked, the user agent must run the following algorithm. (This algorithm is relatively simple and doesn't actually execute any SQL — the bulk of the work is actually done as part of the <a href="#transaction0">transaction steps</a> .) <ol> <li> If the method was not invoked during the execution of a <code><a href= "#sqltransactioncallback">SQLTransactionCallback</a></code> , <code><a href= "#sqlstatementcallback">SQLStatementCallback</a></code> , or <code><a href= "#sqlstatementerrorcallback">SQLStatementErrorCallback</a></code> then raise an <code>INVALID_STATE_ERR</code> exception. (Calls from inside a <code><a href= "#sqltransactionerrorcallback">SQLTransactionErrorCallback</a></code> thus raise an exception. The <code><a href= "#sqltransactionerrorcallback">SQLTransactionErrorCallback</a></code> handler is only called once a transaction has failed, and no SQL statements can be added to a failed transaction.) </li> <li> Parse the first argument to the method ( <var title= "">sqlStatement</var> ) as an SQL statement, with the exception that <code title="">?</code> characters can be used in place of literals in the statement. <a href="#references">[SQL]</a> </li> <li> Replace each <code title="">?</code> placeholder with the value of the argument in the <var title="">arguments</var> array with the same position. (So the first <code title="">?</code> placeholder gets replaced by the first value in the <var title= "">arguments</var> array, and generally the <var title="">n</var> th <code title="">?</code> placeholder gets replaced by the <var title="">n</var> th value in the <var title="">arguments</var> array.) If the second argument is <del class="diff-old">ommitted</del> <ins class="diff-chg">omitted</ins> or null, then treat the <var title="">arguments</var> array as empty. The result is the statement . <ins class="diff-new">Implementation feedback is requested on what to do with arguments that are of types that are not supported by the underlying SQL backend. For example, SQLite doesn't support booleans, so what should the UA do if passed a boolean? The Gears team suggests failing, not silently converting types.</ins> </li> <li> If the syntax of <var title="">sqlStatement</var> is not valid (except for the use of <code title="">?</code> characters in the place of literals), or the statement uses features that are not supported (e.g. due to security reasons), or the number of items in the <var title="">arguments</var> array is not equal to the number of <code title="">?</code> placeholders in the statement, or the statement cannot be parsed for some other reason, then mark the statement as bogus. </li> <li> If the <code><a href="#database0">Database</a></code> object that the <code><a href="#sqltransaction">SQLTransaction</a></code> object was created from has an <a href="#expected" title= "concept-database-expected-version">expected version</a> that is neither the empty string nor the actual version of the database, then mark the statement as bogus. ( <a href="#x1" title= "dom-sqlerror-code-2">Error code 2</a> .) </li> <li> Queue up the statement in the transaction, along with the third argument (if any) as the statement's result set callback and the fourth argument (if any) as the error callback. </li> </ol> The user agent must act as if the database was hosted in an otherwise completely empty environment with no resources. For example, attempts to read from or write to the <del class= "diff-old">filesystem</del> <ins class="diff-chg">file system</ins> will fail. <del class="diff-old">User agents should limit the total amount of space allowed for each origin, but may prompt the user and extend the limit if a database is reaching its quota. User agents should allow users to see how much space each database is using. A mostly arbitrary limit of five megabytes per origin is recommended. Implementation feedback is welcome and will be used to update this suggestion in future.</del> SQL inherently supports multiple concurrent connections. Authors should make appropriate use of the transaction features to handle the case of multiple scripts interacting with the same database simultaneously (as could happen if the same page was opened in two different <a href="#browsing1" title="browsing context">browsing contexts</a> ). User agents must consider statements that use the <code title= "">BEGIN</code> , <code title="">COMMIT</code> , and <code title= "">ROLLBACK</code> SQL features as being unsupported (and thus will mark them as bogus), so as to not let these statements interfere with the explicit transactions managed by the database API itself. A future version of this specification will probably define the exact SQL subset required in more detail. <h5 id="database"><del class= "diff-old">4.11.4.</del> <ins class= "diff-chg">4.11.2.4.</ins> Database query results</h5> The <code title="dom-transaction-executeSql">executeSql()</code> method invokes its callback with a <code><a href= "#sqlresultset">SQLResultSet</a></code> object as an argument. <pre class="idl"> interface <dfn id="sqlresultset">SQLResultSet</dfn> { readonly attribute int <a href="#insertid" title= "dom-SQLResultSet-insertId">insertId</a>; readonly attribute int <a href="#rowsaffected" title= "dom-SQLResultSet-rowsAffected">rowsAffected</a>; readonly attribute <a href= "#sqlresultsetrowlist">SQLResultSetRowList</a> <a href="#rows1" title="dom-SQLResultSet-rows">rows</a>; }; </pre> The <dfn id="insertid" title= "dom-SQLResultSet-insertId"><code>insertId</code></dfn> attribute must return the row ID of the row that the <code><a href= "#sqlresultset">SQLResultSet</a></code> object's SQL statement inserted into the database, if the statement inserted a row. If the statement inserted multiple rows, the ID of the last row must be the one returned. If the statement did not insert a row, then the attribute must instead raise an <code>INVALID_ACCESS_ERR</code> exception. The <dfn id="rowsaffected" title= "dom-SQLResultSet-rowsAffected"><code>rowsAffected</code></dfn> attribute must return the number of rows that were affected by the SQL statement. If the statement did not affected any rows, then the attribute must return zero. For "SELECT" statements, this returns zero (querying the database doesn't affect any rows). The <dfn id="rows1" title= "dom-SQLResultSet-rows"><code>rows</code></dfn> attribute must return a <code><a href= "#sqlresultsetrowlist">SQLResultSetRowList</a></code> representing the rows returned, in the order returned by the database. If no rows were returned, then the object will be <del class= "diff-old">empty.</del> <ins class="diff-chg">empty (its</ins> <code title="dom-SQLResultSetRowList-length"><a href= "#length10"><ins class="diff-chg">length</ins></a></code> <ins class="diff-chg">will be zero).</ins> <pre class="idl"> interface <dfn id="sqlresultsetrowlist">SQLResultSetRowList</dfn> { <del class="diff-old"> readonly attribute unsigned long ; (in unsigned long index); </del> <ins class="diff-chg"> readonly attribute unsigned long <a href= "#length10" title="dom-SQLResultSetRowList-length">length</a>; [IndexGetter] DOMObject <a href="#itemindex5" title= "dom-SQLResultSetRowList-item">item</a>(in unsigned long index); </ins> }; </pre> <code><a href= "#sqlresultsetrowlist">SQLResultSetRowList</a></code> objects have a <dfn id="length10" title= "dom-SQLResultSetRowList-length"><code>length</code></dfn> attribute that must return the number of rows it represents (the number of rows returned by the database). The <dfn id="itemindex5" title= "dom-SQLResultSetRowList-item"><code>item( <var title= "">index</var> )</code></dfn> attribute must return the row with the given index <var title="">index</var> . If there is no such row, then the method must raise an <code>INDEX_SIZE_ERR</code> exception. Each row must be represented by a native ordered dictionary data type. In the ECMAScript binding, this must be <code><a href= "#object">Object</a></code> . Each row object must have one property (or dictionary entry) per column, with those properties enumerating in the order that these columns were returned by the database. Each property must have the name of the column and the value of the cell, as they were returned by the database. <h5 id="errors"><del class= "diff-old">4.11.5.</del> <ins class= "diff-chg">4.11.2.5.</ins> Errors</h5> Errors in the database API are reported using callbacks that have a <code><a href="#sqlerror">SQLError</a></code> object as one of their arguments. <pre class="idl"> interface <dfn id="sqlerror">SQLError</dfn> { readonly attribute unsigned int <a href="#code1" title= "dom-SQLError-code">code</a>; readonly attribute DOMString <a href="#message" title= "dom-SQLError-message">message</a>; }; </pre> The <dfn id="code1" title= "dom-SQLError-code"><code>code</code></dfn> DOM attribute must return the most appropriate code from the following table: <table> <thead> <tr> <th>Code</th> <th>Situation</th> </tr> </thead> <tbody> <tr> <td><dfn id="x" title="dom-sqlerror-code-0">0</dfn></td> <td>The transaction failed for reasons unrelated to the database itself and not covered by any other error code.</td> </tr> <tr> <td><dfn id="x0" title="dom-sqlerror-code-1">1</dfn></td> <td>The statement failed for database reasons not covered by any other error code.</td> </tr> <tr> <td><dfn id="x1" title="dom-sqlerror-code-2">2</dfn></td> <td>The statement failed because the <a href="#expected" title= "concept-database-expected-version">expected version</a> of the database didn't match the actual database version.</td> </tr> <tr> <td><dfn id="x2" title="dom-sqlerror-code-3">3</dfn></td> <td>The statement failed because the data returned from the database was too large. The SQL "LIMIT" modifier might be useful to reduce the size of the result set.</td> </tr> <tr> <td><dfn id="x3" title="dom-sqlerror-code-4">4</dfn></td> <td>The statement failed because there was not enough remaining storage space, or the storage quota was reached and the user declined to give more space to the database.</td> </tr> <tr> <td><dfn id="x4" title="dom-sqlerror-code-5">5</dfn></td> <td>The statement failed because the transaction's first statement was a read-only statement, and a subsequent statement in the same transaction tried to modify the database, but the transaction failed to obtain a write lock before another transaction obtained a write lock and changed a part of the database that the former transaction was <del class="diff-old">dependending</del> <ins class="diff-chg">depending</ins> upon.</td> </tr> <tr> <td><dfn id="x5" title="dom-sqlerror-code-6">6</dfn></td> <td>An <code title="">INSERT</code> , <code title="">UPDATE</code> , or <code title="">REPLACE</code> statement failed due to a constraint failure. For example, because a row was being inserted and the value given for the primary key column duplicated the value of an existing row.</td> </tr> </tbody> </table> We should define a more thorough list of codes. Implementation feedback is requested to determine what codes are needed. The <dfn id="message" title= "dom-SQLError-message"><code>message</code></dfn> DOM attribute must return an error message describing the error encountered. The message should be <del class="diff-old">localised</del> <ins class= "diff-chg">localized</ins> to the user's language. <h5 id="processing3"><del class= "diff-old">4.11.6.</del> <ins class= "diff-chg">4.11.2.6.</ins> Processing model</h5> The <dfn id="transaction0">transaction steps</dfn> are as follows. These steps must be run asynchronously. These steps are invoked with a transaction callback , optionally an error callback , optionally a success callback , optionally a preflight operation , and optionally a postflight operation . <ol> <li> Open a new SQL transaction to the database, and create a <code><a href="#sqltransaction">SQLTransaction</a></code> object that represents that transaction. </li> <li> If an error <del class="diff-old">occured</del> <ins class= "diff-chg">occurred</ins> in the opening of the transaction, jump to the last step. </li> <li> If a preflight operation was defined for this instance of the transaction steps, run that. If it fails, then jump to the last step. (This is basically a hook for the <code title= "dom-database-changeVersion"><a href= "#changeversion">changeVersion()</a></code> method.) </li> <li> Invoke the transaction callback with the aforementioned <code><a href="#sqltransaction">SQLTransaction</a></code> object as its only argument. </li> <li> If the callback couldn't be called (e.g. it was null), or if the callback was invoked and raised an exception, jump to the last step. </li> <li> While there are any statements queued up in the transaction, perform the following steps for each queued up statement in the transaction, oldest first. Each statement has a statement, <ins class="diff-new">optionally</ins> a result set callback, and optionally an error callback. <ol> <li> If the statement is marked as bogus, jump to the "in case of error" steps below. </li> <li> Execute the statement in the context of the transaction. <a href="#references">[SQL]</a> </li> <li> If the statement failed, jump to the "in case of error" steps below. </li> <li> Create a <code><a href="#sqlresultset">SQLResultSet</a></code> object that represents the result of the statement. </li> <li> <del class="diff-old">Invoke</del> <ins class= "diff-chg">If</ins> the <del class="diff-old">statement's</del> <ins class="diff-chg">statement has a</ins> result set <del class= "diff-old">callback</del> <ins class="diff-chg">callback, invoke it</ins> with the <code><a href= "#sqltransaction">SQLTransaction</a></code> object as its first argument and the new <code><a href= "#sqlresultset">SQLResultSet</a></code> object as its second argument. </li> <li> If the callback was invoked and raised an exception, jump to the last step in the overall steps. </li> <li> Move on to the next statement, if any, or onto the next overall step otherwise. </li> </ol> In case of error (or more specifically, if the above substeps say to jump to the "in case of error" steps), run the following substeps: <ol> <li> If the statement had an associated error callback, then invoke that error callback with the <code><a href= "#sqltransaction">SQLTransaction</a></code> object and a newly constructed <code><a href="#sqlerror">SQLError</a></code> object that represents the error that caused these substeps to be run as the two arguments, respectively. </li> <li> If the error callback returns false, then move on to the next statement, if any, or onto the next overall step otherwise. </li> <li> Otherwise, the error callback did not return false, or there was no error callback. Jump to the last step in the overall steps. </li> </ol> </li> <li> If a postflight operation was defined for <del class= "diff-old">his</del> <ins class="diff-chg">this</ins> instance of the transaction steps, run that. If it fails, then jump to the last step. (This is basically a hook for the <code title= "dom-database-changeVersion"><a href= "#changeversion">changeVersion()</a></code> method.) </li> <li> Commit the transaction. </li> <li> If an error <del class="diff-old">occured</del> <ins class= "diff-chg">occurred</ins> in the committing of the transaction, jump to the last step. </li> <li> Invoke the success callback . </li> <li> End these steps. The next step is only used when something goes wrong. </li> <li> Call the error callback with a newly constructed <code><a href="#sqlerror">SQLError</a></code> object that represents the last error to have <del class= "diff-old">occured</del> <ins class="diff-chg">occurred</ins> in this transaction. <del class="diff-old">If the error callback returned false, and the last error wasn't itself a failure when committing the transaction, then try to commit the transaction. If that fails, or if the callback couldn't be called (e.g. the method was called with only one argument), or if it didn't return false, then rollback</del> <ins class="diff-chg">Rollback</ins> the transaction. Any still-pending statements in the transaction are discarded. </li> </ol> <h4 id="disk-space"><ins class= "diff-new">4.11.3</ins> <ins class="diff-new">Disk space</ins></h4> <ins class="diff-new">User agents should limit the total amount of space allowed for storage areas and databases.</ins> <ins class="diff-new">User agents should guard against sites storing data in the storage areas or databases of subdomains, e.g. storing up to the limit in a1.example.com, a2.example.com, a3.example.com, etc, circumventing the main example.com storage limit.</ins> <ins class="diff-new">User agents may prompt the user when quotas are reached, allowing the user to grant a site more space. This enables sites to store many user-created documents on the user's computer, for instance.</ins> <ins class="diff-new">User agents should allow users to see how much space each domain is using.</ins> <ins class="diff-new">A mostly arbitrary limit of five megabytes per domain is recommended. Implementation feedback is welcome and will be used to update this suggestion in future.</ins> <h4 id="privacy"><del class= "diff-old">4.11.7.</del> <ins class="diff-chg">4.11.4</ins> Privacy</h4> <h5 id="user-tracking"><ins class= "diff-new">4.11.4.1.</ins> <ins class="diff-new">User tracking</ins></h5> <ins class="diff-new">A third-party advertiser (or any entity capable of getting content distributed to multiple sites) could use a unique identifier stored in its local storage area or in its client-side database to track a user across multiple sessions, building a profile of the user's interests to allow for highly targeted advertising.</ins> In <del class="diff-old">contrast</del> <ins class="diff-chg">conjunction</ins> with <ins class= "diff-new">a site that is aware of</ins> the <ins class= "diff-chg">user's real identity (for example an e-commerce site that requires authenticated credentials), this could allow oppressive groups to target individuals with greater accuracy than in a world with purely anonymous Web usage.</ins> <ins class="diff-chg">There are a number of techniques that can be used to mitigate the risk of user tracking:</ins> <ul> <li> <ins class="diff-chg">Blocking third-party storage: user agents may restrict access to the</ins> <code title= "dom-localStorage"><del class="diff-old">globalStorage</del> <a href="#localstorage"><ins class= "diff-chg">localStorage</ins></a></code> <del class= "diff-old">feature, which intentionally allows</del> <ins class= "diff-chg">and database objects to scripts originating at the domain of the top-level document of the</ins> <a href= "#browsing1"><ins class="diff-chg">browsing context</ins></a> ,<ins class="diff-chg">for instance denying access to the API for pages from other domains running in</ins> <code><a href= "#iframe"><ins class="diff-chg">iframe</ins></a></code> <ins class= "diff-chg">s.</ins> </li> <li> <ins class="diff-chg">Expiring stored data: user agents may automatically delete stored data after a period of time.</ins> <ins class="diff-chg">For example, a user agent could treat third-party local storage areas as session-only storage, deleting the</ins> data <ins class="diff-new">once the user had closed all the</ins> <ins class="diff-new">browsing contexts</ins> <ins class="diff-new">that could access it.</ins> <ins class="diff-new">This can restrict the ability of a site</ins> to <ins class="diff-new">track a user, as the site would then only</ins> be <del class="diff-old">accessed</del> <ins class= "diff-chg">able to track the user</ins> across multiple <del class= "diff-old">domains, protocols, and ports (albeit</del> <ins class= "diff-chg">sessions when he authenticates with the site itself (e.g. by making a purchase or logging</ins> in <ins class= "diff-new">to</ins> a <del class="diff-old">controlled fashion),</del> <ins class="diff-chg">service).</ins> <ins class="diff-chg">However,</ins> this <ins class= "diff-new">also puts the user's data at risk.</ins> </li> <li> <ins class="diff-new">Treating persistent storage as cookies: user agents should present the persistent storage and</ins> database <del class="diff-old">feature is limited</del> <ins class= "diff-chg">features</ins> to <del class="diff-old">scripts running</del> <ins class="diff-chg">the user in a way that does not distinguish them from HTTP session cookies.</ins> <a href= "#references"><ins class="diff-chg">[RFC2965]</ins></a> <ins class="diff-chg">This might encourage users to view persistent storage</ins> with <ins class="diff-new">healthy suspicion.</ins> </li> <li> <ins class="diff-new">Site-specific white-listing of access to local storage areas and databases: user agents may allow sites to access session storage areas in an unrestricted manner, but require</ins> the <del class="diff-old">same</del> <ins class= "diff-chg">user to authorize access to local storage areas and databases.</ins> </li> <li> <a href="#origin0"><del class="diff-old">origin</del> <ins class="diff-chg">Origin</ins></a> <del class= "diff-old">as</del> <ins class="diff-chg">-tracking of persistent storage data: user agents may record</ins> the <del class= "diff-old">database. Thus, it is expected</del> <ins class= "diff-chg">origins of sites</ins> that <del class="diff-old">the privacy implications</del> <ins class="diff-chg">contained content from third-party origins that caused data to</ins> be <del class= "diff-old">equivalent</del> <ins class="diff-chg">stored.</ins> <ins class="diff-chg">If this information is then used</ins> to <del class="diff-old">those already</del> present <ins class= "diff-new">the view of data currently</ins> in <del class= "diff-old">allowing scripts</del> <ins class="diff-chg">persistent storage, it would allow the user</ins> to <del class= "diff-old">communicate</del> <ins class="diff-chg">make informed decisions about which parts of the persistent storage to prune. Combined</ins> with <del class="diff-old">their originating host.</del> <ins class="diff-chg">a blacklist ("delete this data and prevent this domain from ever storing data again"), the user can restrict the use of persistent storage to sites that he trusts.</ins> </li> <li> <del class="diff-old">User</del> <ins class="diff-chg">Shared blacklists: user</ins> agents <del class="diff-old">are encouraged</del> <ins class="diff-chg">may allow users</ins> to <del class="diff-old">treat</del> <ins class="diff-chg">share their persistent storage domain blacklists.</ins> <ins class="diff-chg">This would allow communities to act together to protect their privacy.</ins> </li> </ul> <ins class="diff-chg">While these suggestions prevent trivial use of these APIs for user tracking, they do not block it altogether. Within a single domain, a site can continue to track the user during a session, and can then pass all this information to the third party along with any identifying information (names, credit card numbers, addresses) obtained by the site. If a third party cooperates with multiple sites to obtain such information, a profile can still be created.</ins> <ins class="diff-chg">However, user tracking is to some extent possible even with no cooperation from the user agent whatsoever, for instance by using session identifiers in URIs, a technique already commonly used for innocuous purposes but easily repurposed for user tracking (even retroactively). This information can then be shared with other sites, using using visitors' IP addresses and other user-specific data (e.g. user-agent headers and configuration settings) to combine separate sessions into coherent user profiles.</ins> <h5 id="cookie"><ins class= "diff-chg">4.11.4.2.</ins> <ins class="diff-chg">Cookie resurrection</ins></h5> <ins class="diff-chg">If the user interface for persistent storage presents</ins> data <del class="diff-old">stored</del> in <del class="diff-old">databases</del> <ins class="diff-chg">the persistent storage features separately from data</ins> in <ins class="diff-new">HTTP session cookies, then users are likely to delete data in one and not</ins> the <del class="diff-old">same way</del> <ins class="diff-chg">other. This would allow sites to use the two features</ins> as <del class="diff-old">cookies</del> <ins class="diff-chg">redundant backup</ins> for <del class= "diff-old">the purposes</del> <ins class="diff-chg">each other, defeating a user's attempts to protect his privacy.</ins> <h4 id="security7"><ins class= "diff-chg">4.11.5</ins> <ins class= "diff-chg">Security</ins></h4> <h5 id="dns-spoofing"><ins class= "diff-chg">4.11.5.1.</ins> <ins class="diff-chg">DNS spoofing attacks</ins></h5> <ins class="diff-chg">Because</ins> of <del class= "diff-old">user interfaces,</del> <ins class="diff-chg">the potential for DNS spoofing attacks, one cannot guarantee that a host claiming</ins> to <del class="diff-old">reduce</del> <ins class="diff-chg">be in a certain domain really is from that domain. To mitigate this, pages can use SSL. Pages using SSL can be sure that only pages using SSL that have certificates identifying them as being from</ins> the <del class="diff-old">risk</del> <ins class="diff-chg">same domain can access their local storage areas and databases.</ins> <h5 id="cross-directory"><ins class= "diff-chg">4.11.5.2.</ins> <ins class= "diff-chg">Cross-directory attacks</ins></h5> <ins class="diff-chg">Different authors sharing one host name, for example users hosting content on</ins> <code><ins class= "diff-chg">geocities.com</ins></code> ,<ins class="diff-chg">all share one persistent storage object and one set</ins> of <del class="diff-old">using this</del> <ins class= "diff-chg">databases. There is no</ins> feature <ins class= "diff-new">to restrict the access by pathname. Authors on shared hosts are therefore recommended to avoid using the persistent storage features, as it would be trivial</ins> for <del class= "diff-old">cookie resurrection.</del> <ins class="diff-chg">other authors to read from and write to the same storage area or database.</ins> <ins class="diff-chg">Even if a path-restriction feature was made available, the usual DOM scripting security model would make it trivial to bypass this protection and access the data from any path.</ins> <h5 id="implementation"><del class= "diff-old">4.11.8.</del> <ins class= "diff-chg">4.11.5.3.</ins> <del class= "diff-old">Security</del> <ins class="diff-chg">Implementation risks</ins></h5> <ins class="diff-chg">The two primary risks when implementing these persistent storage features are letting hostile sites read information from other domains, and letting hostile sites write information that is then read from other domains.</ins> <ins class="diff-chg">Letting third-party sites read data that is not supposed to be read from their domain causes</ins> <ins class="diff-chg">information leakage</ins> ,<ins class="diff-chg">For example, a user's shopping wishlist on one domain could be used by another domain for targeted advertising; or a user's work-in-progress confidential documents stored by a word-processing site could be examined by the site of a competing company.</ins> <ins class="diff-chg">Letting third-party sites write data to the storage areas of other domains can result in</ins> <ins class="diff-chg">information spoofing</ins> ,<ins class="diff-chg">which is equally dangerous. For example, a hostile site could add items to a user's wishlist; or a hostile site could set a user's session identifier to a known ID that the hostile site can then use to track the user's actions on the victim site.</ins> <ins class="diff-chg">Thus, strictly following the</ins> <a href="#origin0"><ins class="diff-chg">origin</ins></a> <ins class="diff-chg">model described in this specification is important for user security.</ins> <h5 id="sql-and"><del class= "diff-old">4.11.8.1.</del> <ins class= "diff-chg">4.11.5.4.</ins> <del class="diff-old">User</del> <ins class="diff-chg">SQL and user</ins> agents</h5> User agent implementors are strongly encouraged to audit all their supported SQL statements for security implications. For example, <code title="">LOAD DATA INFILE</code> is likely to pose security risks and there is little reason to support it. In general, it is recommended that user agents not support features that control how databases are stored on disk. For example, there is little reason to allow Web authors to control the character encoding used in the disk representation of the data, as all data in ECMAScript is implicitly UTF-16. <h5 id="sql-injection"><del class= "diff-old">4.11.8.2.</del> <ins class= "diff-chg">4.11.5.5.</ins> SQL injection</h5> Authors are strongly recommended to make use of the <code title= "">?</code> placeholder feature of the <code title= "dom-sqltransaction-executeSql"><a href= "#executesql">executeSql()</a></code> method, and to never construct SQL statements on the fly. <h3 id="links"><del class= "diff-old">4.12.</del> <ins class="diff-chg">4.12</ins> Links</h3> <h4 id="hyperlink"><del class= "diff-old">4.12.1.</del> <ins class="diff-chg">4.12.1</ins> Hyperlink elements</h4> The <code><a href="#a">a</a></code> , <code><a href= "#area">area</a></code> , and <code><a href="#link">link</a></code> elements can, in certain situations described in the definitions of those elements, represent <dfn id="hyperlinks" title= "hyperlink">hyperlinks</dfn> . The <dfn id="href6" title= "attr-hyperlink-href"><code>href</code></dfn> attribute on a hyperlink element must have a value that is a URI (or IRI). This URI is the destination resource of the hyperlink. <div class="note"> The <code title="attr-hyperlink-href"><a href= "#href6">href</a></code> attribute on <code><a href= "#a">a</a></code> and <code><a href="#area">area</a></code> elements is not required; when those elements do not have <code title="attr-hyperlink-href"><a href="#href6">href</a></code> attributes they do not represent hyperlinks. The <code title="attr-link-href"><a href= "#href1">href</a></code> attribute on the <code><a href= "#link">link</a></code> element is required, but whether a <code><a href="#link">link</a></code> element represents a hyperlink or not depends on the value of the <code title= "attr-link-rel"><a href="#rel">rel</a></code> attribute of that element. </div> The <dfn id="target3" title= "attr-hyperlink-target"><code>target</code></dfn> attribute, if present, must be a <a href="#valid9">valid browsing context name <ins class="diff-new">or keyword</ins></a> . User agents use this name when <a href="#following0">following hyperlinks</a> . The <dfn id="ping" title= "attr-hyperlink-ping"><code>ping</code></dfn> attribute, if present, gives the URIs of the resources that are interested in being notified if the user follows the hyperlink. The value must be a space separated list of one or more URIs (or IRIs). The value is used by the user agent when <a href="#following0">following hyperlinks</a> . For <code><a href="#a">a</a></code> and <code><a href= "#area">area</a></code> elements that represent hyperlinks, the relationship between the document containing the hyperlink and the destination resource indicated by the hyperlink is given by the value of the element's <dfn id="rel3" title= "attr-hyperlink-rel"><code>rel</code></dfn> attribute, which must be a <a href="#set-of">set of space-separated tokens</a> . The <a href="#linkTypes">allowed values and their meanings</a> are defined below. The <code title="attr-hyperlink-rel"><a href= "#rel3">rel</a></code> attribute has no default value. If the attribute is omitted or if none of the values in the attribute are <del class="diff-old">recognised</del> <ins class= "diff-chg">recognized</ins> by the UA, then the document has no particular relationship with the destination resource other than there being a hyperlink between the two. The <dfn id="media12" title= "attr-hyperlink-media"><code>media</code></dfn> attribute describes for which media the target document was designed. It is purely advisory. The value must be a valid <a href="#mq">media <del class= "diff-old">query.</del> <ins class="diff-chg">query</ins></a> . <a href="#references">[MQ]</a> The default, if the <code title= "attr-hyperlink-media"><a href="#media12">media</a></code> attribute is omitted, is <code>all</code> . The <dfn id="hreflang3" title= "attr-hyperlink-hreflang"><code>hreflang</code></dfn> attribute on hyperlink elements, if present, gives the language of the linked resource. It is purely advisory. The value must be a valid RFC 3066 language code. <a href="#references">[RFC3066]</a> User agents must not consider this attribute authoritative — upon fetching the resource, user agents must <del class="diff-old">only</del> use <ins class="diff-new">only</ins> language information associated with the resource to determine its language, not metadata included in the link to the resource. The <dfn id="type17" title= "attr-hyperlink-type"><code>type</code></dfn> attribute, if present, gives the MIME type of the linked resource. It is purely advisory. The value must be a valid MIME type, optionally with parameters. <a href="#references">[RFC2046]</a> User agents must not consider the <code title="attr-hyperlink-type"><a href= "#type17">type</a></code> attribute authoritative — upon fetching the resource, user agents must not use metadata included in the link to the resource to determine its type. <h4 id="following"><del class= "diff-old">4.12.2.</del> <ins class="diff-chg">4.12.2</ins> <dfn id="following0">Following hyperlinks</dfn></h4> When a user follows a hyperlink , the user agent must <a href="#navigate">navigate</a> a <a href="#browsing1">browsing context</a> to the URI of the hyperlink. The URI of the hyperlink is URI given by resolving the <del class="diff-old">the</del> <code title= "attr-hyperlink-href"><a href="#href6">href</a></code> attribute of that hyperlink relative to the hyperlink's element. In the case of server-side image maps, the URI of the hyperlink must further have its <var><a href="#hyperlink2">hyperlink suffix</a></var> appended to it. If the user indicated a specific browsing context when following the hyperlink, or if the user agent is configured to follow hyperlinks by navigating a particular browsing context, then that must be the browsing context that is navigated. Otherwise, if the hyperlink element is an <code><a href= "#a">a</a></code> or <code><a href="#area">area</a></code> element that has a <code title="attr-hyperlink-target"><a href= "#target3">target</a></code> attribute, then the browsing context that is navigated must be chosen by applying <a href= "#the-rules">the rules for <del class="diff-old">chosing</del> <ins class="diff-chg">choosing</ins> a browsing context given a browsing context name</a> , using the value of the <code title= "attr-hyperlink-target"><a href="#target3">target</a></code> attribute as the browsing context name. If these rules result in the creation of a new <a href="#browsing1">browsing context</a> , it must be navigated with <a href="#replacement">replacement enabled</a> . Otherwise, if the hyperlink element is a <a href="#sidebar0" title="rel-sidebar-hyperlink">sidebar hyperlink</a> and the user agent implements a feature that can be considered a secondary browsing context, such a secondary browsing context may be selected as the browsing context to be navigated. Otherwise, if the hyperlink element is an <code><a href= "#a">a</a></code> or <code><a href="#area">area</a></code> element with no <code title="attr-hyperlink-target"><a href= "#target3">target</a></code> attribute, but one of the child nodes of <a href="#the-head0">the <code>head</code> element</a> is a <code><a href="#base">base</a></code> element with a <code title= "attr-base-target"><a href="#target">target</a></code> attribute, then the browsing context that is navigated must be chosen by applying <a href="#the-rules">the rules for <del class= "diff-old">chosing</del> <ins class="diff-chg">choosing</ins> a browsing context given a browsing context name</a> , using the value of the <code title="attr-base-target"><a href= "#target">target</a></code> attribute of the first such <code><a href="#base">base</a></code> element as the browsing context name. If these rules result in the creation of a new <a href="#browsing1">browsing context</a> , it must be navigated with <a href="#replacement">replacement enabled</a> . Otherwise, the browsing context that must be navigated is the same browsing context as the one which the hyperlink element itself is in. <ins class="diff-new">The navigation must be done with the</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">that contains the</ins> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">object with which the hyperlink's element in question is associated as the</ins> <a href="#source0"><ins class= "diff-new">source browsing context</ins></a> . <h5 id="hyperlink0">4.12.2.1. Hyperlink auditing</h5> If an <code><a href="#a">a</a></code> or <code><a href= "#area">area</a></code> hyperlink element has a <code title= "attr-hyperlink-ping"><a href="#ping">ping</a></code> attribute and the user follows the hyperlink, the user agent must take the <code title="attr-hyperlink-ping"><a href="#ping">ping</a></code> attribute's value, split that string on spaces , treat each resulting token as a URI (resolving relative URIs according to <a href= "#elements2">element's base <del class="diff-old">URI)</del> <ins class="diff-chg">URI</ins></a> <ins class="diff-chg">)</ins> and then should send a request <ins class="diff-new">(as described below)</ins> to each of the resulting URIs. This may be done in parallel with the primary request, and is independent of the result of that request. User agents should allow the user to adjust this <del class= "diff-old">behaviour,</del> <ins class="diff-chg">behavior,</ins> for example in conjunction with a setting that disables the sending of HTTP <code title="">Referer</code> headers. Based on the user's preferences, UAs may either <a href="#ignored">ignore</a> the <code title="attr-hyperlink-ping"><a href="#ping">ping</a></code> attribute altogether, or selectively ignore URIs in the list (e.g. ignoring any third-party URIs). For URIs that are HTTP URIs, the requests must be performed using the POST method (with an empty entity body in the request). <ins class="diff-new">All relevant cookie and HTTP authentication headers must be included in the request. Which other headers are required depends on the URIs involved.</ins> <dl class="switch"> <dt><ins class="diff-new">If both the URI of the</ins> <code><ins class="diff-new">Document</ins></code> <ins class= "diff-new">object containing the hyperlink being audited and the ping URI have the</ins> <a href="#same-origin"><ins class= "diff-new">same origin</ins></a></dt> <dd><ins class="diff-new">The request must include a</ins> <code title=""><ins class="diff-new">Ping-From</ins></code> <ins class="diff-new">HTTP header with, as its value, the location of the document containing the hyperlink, and a</ins> <code title= ""><ins class="diff-new">Ping-To</ins></code> <ins class= "diff-new">HTTP header with, as its value, the address of the target of the hyperlink. The request must not include a</ins> <code title=""><ins class="diff-new">Referer</ins></code> <ins class="diff-new">HTTP header.</ins></dd> <dt><ins class="diff-new">Otherwise, if the origins are different, but the document containing the hyperlink being audited was not retrieved over an encrypted connection</ins></dt> <dd><ins class="diff-new">The request must include a</ins> <code title=""><ins class="diff-new">Referer</ins></code> <ins class="diff-new">HTTP header [sic] with, as its value, the location of the document containing the hyperlink, a</ins> <code title=""><ins class="diff-new">Ping-From</ins></code> <ins class="diff-new">HTTP header with the same value, and a</ins> <code title=""><ins class="diff-new">Ping-To</ins></code> <ins class="diff-new">HTTP header with, as its value, the address of the target of the hyperlink.</ins></dd> <dt><ins class="diff-new">Otherwise, the origins are different and the document containing the hyperlink being audited was retrieved over an encrypted connection</ins></dt> <dd><ins class="diff-new">The request must include a</ins> <code title=""><ins class="diff-new">Ping-To</ins></code> <ins class="diff-new">HTTP header with, as its value, the address of the target of the hyperlink. The request must neither include a</ins> <code title=""><ins class="diff-new">Referer</ins></code> <ins class="diff-new">HTTP header nor include a</ins> <code title= ""><ins class="diff-new">Ping-From</ins></code> <ins class= "diff-new">HTTP header.</ins></dd> </dl> <ins class="diff-new">To save bandwidth, implementors might also wish to consider omitting optional headers such as</ins> <code><ins class="diff-new">Accept</ins></code> <ins class="diff-new">from these requests.</ins> User agents must ignore any entity bodies returned in the responses, but must, unless otherwise specified by the user, <del class="diff-old">honour</del> <ins class= "diff-chg">honor</ins> the HTTP headers <del class= "diff-old">—</del> <ins class="diff-chg">(including,</ins> in particular, <ins class="diff-new">redirects and</ins> HTTP cookie <del class="diff-old">headers.</del> <ins class= "diff-chg">headers).</ins> <a href="#references">[RFC2965]</a> <del class="diff-old">To save bandwidth, implementors might wish to consider omitting optional headers such as Accept from these requests.</del> When the <code title="attr-hyperlink-ping"><a href= "#ping">ping</a></code> attribute is present, user agents should clearly indicate to the user that following the hyperlink will also cause secondary requests to be sent in the background, possibly including listing the actual target URIs. <div class="note"> The <code title="attr-hyperlink-ping"><a href= "#ping">ping</a></code> attribute is redundant with pre-existing technologies like HTTP redirects and JavaScript in allowing Web pages to track which off-site links are most popular or allowing advertisers to track click-through rates. However, the <code title="attr-hyperlink-ping"><a href= "#ping">ping</a></code> attribute provides these advantages to the user over those alternatives: <ul> <li>It allows the user to see the final target URI unobscured.</li> <li>It allows the UA to inform the user about the out-of-band notifications.</li> <li>It allows the paranoid user to disable the notifications without losing the underlying link functionality.</li> <li>It allows the UA to <del class="diff-old">optimise</del> <ins class="diff-chg">optimize</ins> the use of available network bandwidth so that the target page loads faster.</li> </ul> Thus, while it is possible to track users without this feature, authors are encouraged to use the <code title= "attr-hyperlink-ping"><a href="#ping">ping</a></code> attribute so that the user agent can improve the user experience. </div> <h4 id="linkTypes"><del class= "diff-old">4.12.3.</del> <ins class="diff-chg">4.12.3</ins> Link types</h4> The following table <del class="diff-old">summarises</del> <ins class="diff-chg">summarizes</ins> the link types that are defined by this specification. This table is non-normative; the actual definitions for the link types are given in the next few sections. In this section, the term referenced document refers to the resource identified by the element representing the link, and the term current document refers to the resource within which the element representing the link finds itself. To determine which link types apply to a <code><a href= "#link">link</a></code> , <code><a href="#a">a</a></code> , or <code><a href="#area">area</a></code> element, the element's <code title="">rel</code> attribute must be <a href="#split" title= "split a string on spaces">split on spaces</a> . The resulting tokens are the link types that apply to that element. Unless otherwise specified, a keyword must not be specified more than once per <code title="attr-rel-hyperlink">rel</code> attribute. <table> <thead> <tr> <th rowspan="2">Link type</th> <th colspan="2">Effect on...</th> <th rowspan="2">Brief description</th> </tr> <tr> <th><code><a href="#link">link</a></code></th> <th><code><a href="#a">a</a></code> and <code><a href= "#area">area</a></code></th> </tr> </thead> <tbody> <tr> <td><code title="rel-alternate"><a href= "#alternate">alternate</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Gives alternate representations of the current document.</td> </tr> <tr> <td><code title="rel-archives"><a href= "#archives">archives</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Provides a link to a collection of records, documents, or other materials of historical interest.</td> </tr> <tr> <td><code title="rel-author"><a href= "#author">author</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Gives a link to the current document's author.</td> </tr> <tr> <td><code title="rel-bookmark"><a href= "#bookmark">bookmark</a></code></td> <td>not allowed</td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Gives the permalink for the nearest ancestor section. <del class="diff-old">contact Hyperlink Hyperlink Gives a link to contact information for the current document.</del></td> </tr> <tr> <td><code title="rel-external"><a href= "#external">external</a></code></td> <td>not allowed</td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Indicates that the referenced document is not part of the same site as the current document.</td> </tr> <tr> <td><code title="rel-feed"><a href="#feed">feed</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Gives the address of a syndication feed for the current document.</td> </tr> <tr> <td><code title="rel-first"><a href="#first">first</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Indicates that the current document is a part of a series, and that the first document in the series is the referenced document.</td> </tr> <tr> <td><code title="rel-help"><a href="#help">help</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Provides a link to context-sensitive help.</td> </tr> <tr> <td><code title="rel-icon"><a href="#icon3">icon</a></code></td> <td><a href="#links1" title="external resource link">External Resource</a></td> <td>not allowed</td> <td>Imports an icon to represent the current document.</td> </tr> <tr> <td><code title="rel-index"><a href="#index0">index</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Gives a link to the document that provides a table of contents or index listing the current document.</td> </tr> <tr> <td><code title="rel-last"><a href="#last">last</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Indicates that the current document is a part of a series, and that the last document in the series is the referenced document.</td> </tr> <tr> <td><code title="rel-license"><a href= "#license">license</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Indicates that the current document is covered by the copyright license described by the referenced document.</td> </tr> <tr> <td><code title="rel-next"><a href="#next">next</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Indicates that the current document is a part of a series, and that the next document in the series is the referenced document.</td> </tr> <tr> <td><code title="rel-nofollow"><a href= "#nofollow">nofollow</a></code></td> <td>not allowed</td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Indicates that the current document's original author or publisher does not endorse the referenced document.</td> </tr> <tr> <td><code title="rel-noreferrer"><a href= "#noreferrer">noreferrer</a></code></td> <td>not allowed</td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Requires that the user agent not send an HTTP <code title= "">Referer</code> header if the user follows the hyperlink.</td> </tr> <tr> <td><code title="rel-pingback"><a href= "#pingback">pingback</a></code></td> <td><a href="#links1" title="external resource link">External Resource</a></td> <td>not allowed</td> <td>Gives the address of the pingback server that handles pingbacks to the current document.</td> </tr> <tr> <td><code title="rel-prefetch"><a href= "#prefetch">prefetch</a></code></td> <td><a href="#links1" title="external resource link">External Resource</a></td> <td>not allowed</td> <td>Specifies that the target resource should be <del class= "diff-old">pre-emptively</del> <ins class= "diff-chg">preemptively</ins> cached.</td> </tr> <tr> <td><code title="rel-prev"><a href="#prev">prev</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Indicates that the current document is a part of a series, and that the previous document in the series is the referenced document.</td> </tr> <tr> <td><code title="rel-search"><a href= "#search0">search</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Gives a link to a resource that can be used to search through the current document and its related pages.</td> </tr> <tr> <td><code title="rel-stylesheet"><a href= "#stylesheet">stylesheet</a></code></td> <td><a href="#links1" title="external resource link">External Resource</a></td> <td>not allowed</td> <td>Imports a stylesheet.</td> </tr> <tr> <td><code title="rel-sidebar"><a href= "#sidebar">sidebar</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Specifies that the referenced document, if retrieved, is intended to be shown in the browser's sidebar (if it has one).</td> </tr> <tr> <td><code title="rel-tag"><a href="#tag">tag</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Gives a tag (identified by the given address) that applies to the current document.</td> </tr> <tr> <td><code title="rel-up"><a href="#up">up</a></code></td> <td><a href="#hyperlink1" title="hyperlink link">Hyperlink</a></td> <td><a href="#hyperlinks">Hyperlink</a></td> <td>Provides a link to a document giving the context for the current document.</td> </tr> </tbody> </table> Some of the types described below list synonyms for these values. These are to be handled as specified by user agents, but must not be used in documents. <h5 id="link-type">4.12.3.1. Link type " <dfn id="alternate" title= "rel-alternate"><code>alternate</code></dfn> "</h5> The <code title="rel-alternate"><a href= "#alternate">alternate</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href= "#a">a</a></code> , and <code><a href="#area">area</a></code> elements. For <code><a href="#link">link</a></code> elements, if the <code title="attr-link-rel"><a href="#rel">rel</a></code> attribute does not also contain the keyword <code title= "rel-stylesheet"><a href="#stylesheet">stylesheet</a></code> , it creates a <a href="#hyperlink1" title= "hyperlink link">hyperlink</a> ; but if it does also <del class="diff-old">contains</del> <ins class= "diff-chg">contain</ins> the keyword <code title= "rel-stylesheet"><a href="#stylesheet">stylesheet</a></code> , the <code title="rel-alternate"><a href= "#alternate">alternate</a></code> keyword instead modifies the meaning of the <code title="rel-stylesheet"><a href= "#stylesheet">stylesheet</a></code> keyword in the way described for that keyword, and the rest of this subsection doesn't apply. The <code title="rel-alternate"><a href= "#alternate">alternate</a></code> keyword indicates that the referenced document is an alternate representation of the current document. The nature of the referenced document is given by the <code title="attr-hyperlink-media"><a href= "#media12">media</a></code> , <code title= "attr-hyperlink-hreflang"><a href="#hreflang3">hreflang</a></code> , and <code title="attr-hyperlink-type"><a href= "#type17">type</a></code> attributes. If the <code title="rel-alternate"><a href= "#alternate">alternate</a></code> keyword is used with the <code title="attr-hyperlink-media"><a href= "#media12">media</a></code> attribute, it indicates that the referenced document is intended for use with the media specified. If the <code title="rel-alternate"><a href= "#alternate">alternate</a></code> keyword is used with the <code title="attr-hyperlink-hreflang"><a href= "#hreflang3">hreflang</a></code> attribute, and that attribute's value differs from the <a href="#root-element">root element</a> 's <a href="#language">language</a> , it indicates that the referenced document is a translation. If the <code title="rel-alternate"><a href= "#alternate">alternate</a></code> keyword is used with the <code title="attr-hyperlink-type"><a href="#type17">type</a></code> attribute, it indicates that the referenced document is a reformulation of the current document in the specified format. The <code title="attr-hyperlink-media"><a href= "#media12">media</a></code> , <code title= "attr-hyperlink-hreflang"><a href="#hreflang3">hreflang</a></code> , and <code title="attr-hyperlink-type"><a href= "#type17">type</a></code> attributes can be combined when specified with the <code title="rel-alternate"><a href= "#alternate">alternate</a></code> keyword. <div class="example"> For example, the following link is a French translation that uses the PDF format: <pre> <link rel=alternate type=application/pdf hreflang=fr href=manual-fr> </pre></div> If the <code title="rel-alternate"><a href= "#alternate">alternate</a></code> keyword is used with the <code title="attr-hyperlink-type"><a href="#type17">type</a></code> attribute set to the value <code title= "">application/rss+xml</code> or the value <code title= "">application/atom+xml</code> , then the user agent must treat the link as it would if it had the <code title="rel-feed"><a href= "#feed">feed</a></code> keyword specified as well. The <code title="rel-alternate"><a href= "#alternate">alternate</a></code> link relationship is transitive — that is, if a document links to two other documents with the link type " <code title="rel-alternate"><a href= "#alternate">alternate</a></code> ", then, in addition to implying that those documents are alternative representations of the first document, it is also implying that those two documents are alternative representations of each other. <h5 id="link-type0">4.12.3.2. Link type " <dfn id="archives" title= "rel-archives"><code>archives</code></dfn> "</h5> The <code title="rel-archives"><a href= "#archives">archives</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href= "#a">a</a></code> , and <code><a href="#area">area</a></code> elements. For <code><a href="#link">link</a></code> elements, it creates a <a href="#hyperlink1" title= "hyperlink link">hyperlink</a> . The <code title="rel-archives"><a href= "#archives">archives</a></code> keyword indicates that the referenced document describes a collection of records, documents, or other materials of historical interest. A blog's index page could link to an index of the blog's past posts with <code title="">rel="archives"</code> . Synonyms : For historical reasons, user agents must also treat the keyword " <code title="">archive</code> " like the <code title="rel-archives"><a href= "#archives">archives</a></code> keyword. <h5 id="link-type1">4.12.3.3. Link type " <dfn id="author" title="rel-author"><code>author</code></dfn> "</h5> The <code title="rel-author"><a href="#author">author</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href="#a">a</a></code> , and <code><a href= "#area">area</a></code> elements. For <code><a href= "#link">link</a></code> elements, it creates a <a href= "#hyperlink1" title="hyperlink link">hyperlink</a> . For <code><a href="#a">a</a></code> and <code><a href= "#area">area</a></code> elements, the <code title= "rel-author"><a href="#author">author</a></code> keyword indicates that the referenced document provides further information about the author of the section that the element defining the hyperlink <a href="#applyToSection">applies</a> to. For <code><a href="#link">link</a></code> elements, the <code title="rel-author"><a href="#author">author</a></code> keyword indicates that the referenced document provides further information about the author for the page as a whole. The "referenced document" can be, and often is, a <code title="">mailto:</code> URI giving the e-mail address of the author. <a href="#references">[MAILTO]</a> Synonyms : For historical reasons, user agents must also treat <code><a href="#link">link</a></code> , <code><a href="#a">a</a></code> , and <code><a href= "#area">area</a></code> elements that have a <code title= "">rev</code> attribute with the value " <code>made</code> " as having the <code title="rel-author"><a href= "#author">author</a></code> keyword specified as a link relationship. <h5 id="link-type2">4.12.3.4. Link type " <dfn id="bookmark" title= "rel-bookmark"><code>bookmark</code></dfn> "</h5> The <code title="rel-bookmark"><a href= "#bookmark">bookmark</a></code> keyword may be used with <code><a href="#a">a</a></code> and <code><a href= "#area">area</a></code> elements. The <code title="rel-bookmark"><a href= "#bookmark">bookmark</a></code> keyword gives a permalink for the nearest ancestor <code><a href="#article">article</a></code> element of the linking element in question, or of <a href= "#associatedSection">the section the linking element is most closely associated with</a> , if there are no ancestor <code><a href="#article">article</a></code> elements. <div class="example"> The following snippet has three permalinks. A user agent could determine which permalink applies to which part of the spec by looking at where the permalinks are given. <pre> ... <body> <h1>Example of permalinks</h1> <div id="a"> <h2>First example</h2> <p><a href="a.html" rel="bookmark">This</a> permalink applies to only the content from the first H2 to the second H2. The DIV isn't exactly that section, but it roughly corresponds to it. </div> <h2>Second example</h2> <article id="b"> <p><a href="b.html" rel="bookmark">This</a> permalink applies to the outer ARTICLE element (which could be, e.g., a blog post). <article id="c"> <p><a href="c.html" rel="bookmark">This</a> permalink applies to the inner ARTICLE element (which could be, e.g., a blog comment). </article> </article> </body> ... </pre></div> <h5 id="link-type3">4.12.3.5. Link type " <del class="diff-old">contact " The contact keyword may be used with link , a , and area elements. For link elements, it creates a hyperlink . For a and area elements, the contact keyword indicates that the referenced document provides further contact information for the section that the element defining the hyperlink applies to. User agents must treat any hyperlink in an address element as having the contact link type specified. For link elements, the contact keyword indicates that the referenced document provides further contact information for the page as a whole. 4.12.3.6. Link type "</del> <dfn id="external" title= "rel-external"><code>external</code></dfn> "</h5> The <code title="rel-external"><a href= "#external">external</a></code> keyword may be used with <code><a href="#a">a</a></code> and <code><a href= "#area">area</a></code> elements. The <code title="rel-external"><a href= "#external">external</a></code> keyword indicates that the link is leading to a document that is not part of the site that the current document forms a part of. <h5 id="link-type4"><del class= "diff-old">4.12.3.7.</del> <ins class= "diff-chg">4.12.3.6.</ins> Link type " <dfn id="feed" title= "rel-feed"><code>feed</code></dfn> "</h5> The <code title="rel-feed"><a href="#feed">feed</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href="#a">a</a></code> , and <code><a href= "#area">area</a></code> elements. For <code><a href= "#link">link</a></code> elements, it creates a <a href= "#hyperlink1" title="hyperlink link">hyperlink</a> . The <code title="rel-feed"><a href="#feed">feed</a></code> keyword indicates that the referenced document is a syndication feed. If the <code title="rel-alternate"><a href= "#alternate">alternate</a></code> link type is also specified, then the feed is specifically the feed for the current document; otherwise, the feed is just a syndication feed, not necessarily associated with a particular Web page. The first <code><a href="#link">link</a></code> , <code><a href= "#a">a</a></code> , or <code><a href="#area">area</a></code> element in the document (in tree order) that creates a hyperlink with the link type <code title="rel-feed"><a href= "#feed">feed</a></code> must be treated as the default syndication feed for the purposes of feed autodiscovery. The <code title="rel-feed"><a href= "#feed">feed</a></code> keyword is implied by the <code title= "rel-alternate"><a href="#alternate">alternate</a></code> link type in certain cases (q.v.). <div class="example"> The following two <code><a href="#link">link</a></code> elements are equivalent: both give the syndication feed for the current page: <pre> <link rel="alternate" type="application/atom+xml" href="data.xml"> </pre> <pre> <link rel="feed alternate" href="data.xml"> </pre> The following extract offers various different syndication feeds: <pre> <p>You can access the planets database using Atom feeds:</p> <ul> <li><a href="recently-visited-planets.xml" rel="feed">Recently Visited Planets</a></li> <li><a href="known-bad-planets.xml" rel="feed">Known Bad Planets</a></li> <li><a href="unexplored-planets.xml" rel="feed">Unexplored Planets</a></li> </ul> </pre></div> <h5 id="link-type5"><del class= "diff-old">4.12.3.8.</del> <ins class= "diff-chg">4.12.3.7.</ins> Link type " <dfn id="help" title= "rel-help"><code>help</code></dfn> "</h5> The <code title="rel-help"><a href="#help">help</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href="#a">a</a></code> , and <code><a href= "#area">area</a></code> elements. For <code><a href= "#link">link</a></code> elements, it creates a <a href= "#hyperlink1" title="hyperlink link">hyperlink</a> . For <code><a href="#a">a</a></code> and <code><a href= "#area">area</a></code> elements, the <code title= "rel-help"><a href="#help">help</a></code> keyword indicates that the referenced document provides further help information for the parent of the element defining the hyperlink, and its children. <div class="example"> In the following example, the form control has associated context-sensitive help. The user agent could use this information, for example, displaying the referenced document if the user presses the "Help" or "F1" key. <pre> <p> <label> Topic: <input name=topic> <a href="help/topic.html" rel="help"> (Help)</a> </label> </p> </pre></div> For <code><a href="#link">link</a></code> elements, the <code title="rel-help"><a href="#help">help</a></code> keyword indicates that the referenced document provides help for the page as a whole. <h5 id="rel-icon"><del class= "diff-old">4.12.3.9.</del> <ins class= "diff-chg">4.12.3.8.</ins> Link type " <dfn id="icon3" title="rel-icon"><code>icon</code></dfn> "</h5> The <code title="rel-icon"><a href="#icon3">icon</a></code> keyword may be used with <code><a href="#link">link</a></code> elements, for which it creates an <a href="#links1" title= "external resource link">external resource link</a> . The specified resource is an icon representing the page or site, and should be used by the user agent when representing the page in the user interface. Icons could be auditory icons, visual icons, or other kinds of icons. If multiple icons are provided, the user agent must select the most appropriate icon according to the <code title= "attr-link-type"><a href="#type"><ins class= "diff-new">type</ins></a></code> , <code title= "attr-link-media"><a href="#media0">media</a></code> , <ins class= "diff-new">and</ins> <code title="attr-link-sizes"><a href= "#sizes0"><ins class="diff-new">sizes</ins></a></code> <ins class= "diff-new">attributes. If there are multiple equally appropriate icons, user agents must use the last one declared in</ins> <a href= "#tree-order"><ins class="diff-new">tree order</ins></a> .<ins class="diff-new">If the user agent tries to use an icon but that icon is determined, upon closer examination, to in fact be inappropriate (e.g. because it uses an unsupported format), then the user agent must try the next-most-appropriate icon as determined by the attributes.</ins> <ins class="diff-new">There is no default type for resources given by the</ins> <code title="rel-icon"><a href= "#icon3"><ins class="diff-new">icon</ins></a></code> <ins class= "diff-new">keyword.</ins> <ins class="diff-new">The</ins> <dfn id="sizes0" title= "attr-link-sizes"><code><ins class= "diff-new">sizes</ins></code></dfn> <ins class="diff-new">attribute gives the sizes of icons for visual media.</ins> <ins class="diff-new">If specified, the attribute must have a value that is an</ins> <a href="#unordered"><ins class= "diff-new">unordered set of unique space-separated tokens</ins></a> .<ins class="diff-new">The values must all be either</ins> <code title="attr-link-sizes-any"><a href="#any"><ins class= "diff-new">any</ins></a></code> <ins class="diff-new">or a value that consists of two</ins> <a href="#valid" title= "valid non-negative integer"><ins class="diff-new">valid non-negative integers</ins></a> <ins class="diff-new">that do not have a leading U+0030 DIGIT ZERO (0) character and that are separated by a single U+0078 LATIN SMALL LETTER X character.</ins> <ins class="diff-new">The keywords represent icon sizes.</ins> <ins class="diff-new">To parse and process the attribute's value, the user agent must first</ins> <a href="#split" title= "split a string on spaces"><ins class="diff-new">split the attribute's value on spaces</ins></a> ,<ins class="diff-new">and must then parse each resulting keyword to determine what it represents.</ins> <ins class="diff-new">The</ins> <dfn id="any" title= "attr-link-sizes-any"><code><ins class="diff-new">any</ins></code> <del class="diff-old">attribute.</del></dfn> <ins class= "diff-chg">keyword represents that the resource contains a scalable icon, e.g. as provided by an SVG image.</ins> <ins class="diff-chg">Other keywords must be further parsed as follows to determine what they represent:</ins> <ul> <li> <ins class="diff-chg">If the keyword doesn't contain exactly one U+0078 LATIN SMALL LETTER X character, then this keyword doesn't represent anything. Abort these steps for that keyword.</ins> </li> <li> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">width string</ins></var> <ins class="diff-chg">be the string before the "</ins> <code title=""><ins class= "diff-chg">x</ins></code> <ins class="diff-chg">".</ins> </li> <li> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">height string</ins></var> <ins class="diff-chg">be the string after the "</ins> <code title=""><ins class= "diff-chg">x</ins></code> <ins class="diff-chg">".</ins> </li> <li> <ins class="diff-chg">If either</ins> <var title=""><ins class= "diff-chg">width string</ins></var> <ins class="diff-chg">or</ins> <var title=""><ins class="diff-chg">height string</ins></var> <ins class="diff-chg">start with a U+0030 DIGIT ZERO (0) character or contain any characters other than characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), then this keyword doesn't represent anything. Abort these steps for that keyword.</ins> </li> <li> <ins class="diff-chg">Apply the</ins> <a href= "#rules"><ins class="diff-chg">rules for parsing non-negative integers</ins></a> <ins class="diff-chg">to</ins> <var title= ""><ins class="diff-chg">width string</ins></var> <ins class= "diff-chg">to obtain</ins> <var title=""><ins class= "diff-chg">width</ins></var> . </li> <li> <ins class="diff-chg">Apply the</ins> <a href= "#rules"><ins class="diff-chg">rules for parsing non-negative integers</ins></a> <ins class="diff-chg">to</ins> <var title= ""><ins class="diff-chg">height string</ins></var> <ins class= "diff-chg">to obtain</ins> <var title=""><ins class= "diff-chg">height</ins></var> . </li> <li> <ins class="diff-chg">The keyword represents that the resource contains a bitmap icon with a width of</ins> <var title= ""><ins class="diff-chg">width</ins></var> <ins class= "diff-chg">device pixels and a height of</ins> <var title= ""><ins class="diff-chg">height</ins></var> <ins class= "diff-chg">device pixels.</ins> </li> </ul> <ins class="diff-chg">The keywords specified on the</ins> <code title="attr-link-sizes"><a href="#sizes0"><ins class= "diff-chg">sizes</ins></a></code> <ins class="diff-chg">attribute must not represent icon sizes that are not actually available in the linked resource.</ins> <ins class="diff-chg">If the attribute is not specified, then the user agent must assume that the given icon is appropriate, but less appropriate than an icon of a known and appropriate size.</ins> <div class="example"> <ins class="diff-chg">The following snippet shows the top part of an application with several icons.</ins> <pre> <!DOCTYPE HTML><ins class="diff-chg"> <html> <head> <title>lsForums — Inbox</title> <link rel=icon href=favicon.png sizes="16x16"> <link rel=icon href=windows.ico sizes="32x32 48x48"> <link rel=icon href=mac.icns sizes="128x128 512x512 8192x8192 32768x32768"> <link rel=icon href=iphone.png sizes="59x60"> <link rel=icon href=gnome.svg sizes="any"> <link rel=stylesheet href=lsforums.css> <script src=lsforums.js></script> <meta name=application-name content="lsForums"> </head> <body> ... </ins> </pre></div> <h5 id="link-type6"><del class= "diff-old">4.12.3.10.</del> <ins class= "diff-chg">4.12.3.9.</ins> Link type " <dfn id="license" title="rel-license"><code>license</code></dfn> "</h5> The <code title="rel-license"><a href= "#license">license</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href= "#a">a</a></code> , and <code><a href="#area">area</a></code> elements. For <code><a href="#link">link</a></code> elements, it creates a <a href="#hyperlink1" title= "hyperlink link">hyperlink</a> . The <code title="rel-license"><a href= "#license">license</a></code> keyword indicates that the referenced document provides the copyright license terms under which the current document is provided. Synonyms : For historical reasons, user agents must also treat the keyword " <code title="">copyright</code> " like the <code title="rel-license"><a href= "#license">license</a></code> keyword. <h5 id="link-type7"><del class= "diff-old">4.12.3.11.</del> <ins class= "diff-chg">4.12.3.10.</ins> Link type " <dfn id="nofollow" title="rel-nofollow"><code>nofollow</code></dfn> "</h5> The <code title="rel-nofollow"><a href= "#nofollow">nofollow</a></code> keyword may be used with <code><a href="#a">a</a></code> and <code><a href= "#area">area</a></code> elements. The <code title="rel-nofollow"><a href= "#nofollow">nofollow</a></code> keyword indicates that the link is not endorsed by the original author or publisher of the <del class= "diff-old">page.</del> <ins class="diff-chg">page, or that the link to the referenced document was included primarily because of a commercial relationship between people affiliated with the two pages.</ins> <h5 id="link-type8"><del class= "diff-old">4.12.3.12.</del> <ins class= "diff-chg">4.12.3.11.</ins> Link type " <dfn id="noreferrer" title="rel-noreferrer"><code>noreferrer</code></dfn> "</h5> The <code title="rel-noreferrer"><a href= "#noreferrer">noreferrer</a></code> keyword may be used with <code><a href="#a">a</a></code> and <code><a href= "#area">area</a></code> elements. If a user agent follows a link defined by an <code><a href= "#a">a</a></code> or <code><a href="#area">area</a></code> element that has the <code title="rel-noreferrer"><a href= "#noreferrer">noreferrer</a></code> keyword, the user agent must not include a <code title="">Referer</code> HTTP header (or equivalent for other protocols) in the request. <h5 id="link-type9"><del class= "diff-old">4.12.3.13.</del> <ins class= "diff-chg">4.12.3.12.</ins> Link type " <dfn id="pingback" title="rel-pingback"><code>pingback</code></dfn> "</h5> The <code title="rel-pingback"><a href= "#pingback">pingback</a></code> keyword may be used with <code><a href="#link">link</a></code> elements, for which it creates an <a href="#links1" title= "external resource link">external resource link</a> . For the semantics of the <code title="rel-pingback"><a href= "#pingback">pingback</a></code> keyword, see the Pingback 1.0 specification. <a href="#references">[PINGBACK]</a> <h5 id="link-type10"><del class= "diff-old">4.12.3.14.</del> <ins class= "diff-chg">4.12.3.13.</ins> Link type " <dfn id="prefetch" title="rel-prefetch"><code>prefetch</code></dfn> "</h5> The <code title="rel-prefetch"><a href= "#prefetch">prefetch</a></code> keyword may be used with <code><a href="#link">link</a></code> elements, for which it creates an <a href="#links1" title= "external resource link">external resource link</a> . The <code title="rel-prefetch"><a href= "#prefetch">prefetch</a></code> keyword indicates that preemptively fetching and caching the specified resource is likely to be beneficial, as it is highly likely that the user will require this resource. <ins class="diff-chg">There is no default type for resources given by the</ins> <code title="rel-prefetch"><a href= "#prefetch"><ins class="diff-chg">prefetch</ins></a></code> <ins class="diff-chg">keyword.</ins> <h5 id="link-type11"><del class= "diff-old">4.12.3.15.</del> <ins class= "diff-chg">4.12.3.14.</ins> Link type " <dfn id="search0" title="rel-search"><code>search</code></dfn> "</h5> The <code title="rel-search"><a href= "#search0">search</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href= "#a">a</a></code> , and <code><a href="#area">area</a></code> elements. For <code><a href="#link">link</a></code> elements, it creates a <a href="#hyperlink1" title= "hyperlink link">hyperlink</a> . The <code title="rel-search"><a href= "#search0">search</a></code> keyword indicates that the referenced document provides an interface specifically for searching the document and its related resources. OpenSearch description documents can be used with <code><a href="#link">link</a></code> elements and the <code title= "rel-search"><a href="#search0">search</a></code> link type to enable user agents to autodiscover search interfaces. <a href= "#references">[OPENSEARCH]</a> <h5 id="link-type12"><del class= "diff-old">4.12.3.16.</del> <ins class= "diff-chg">4.12.3.15.</ins> Link type " <dfn id="stylesheet" title="rel-stylesheet"><code>stylesheet</code></dfn> "</h5> The <code title="rel-stylesheet"><a href= "#stylesheet">stylesheet</a></code> keyword may be used with <code><a href="#link">link</a></code> elements, for which it creates an <a href="#links1" title= "external resource link">external resource link</a> that contributes to the <a href="#styling0">styling processing model</a> . The specified resource is a resource that describes how to present the document. Exactly how the resource is to be processed depends on the actual type of the resource. If the <code title="rel-alternate"><a href= "#alternate">alternate</a></code> keyword is also specified on the <code><a href="#link">link</a></code> element, then the link is an alternative stylesheet. <ins class="diff-chg">The default type for resources given by the</ins> <code title="rel-stylesheet"><a href= "#stylesheet"><ins class="diff-chg">stylesheet</ins></a></code> <ins class="diff-chg">keyword is</ins> <code title=""><ins class= "diff-chg">text/css</ins></code> . <ins class="diff-chg">Quirk:</ins> <ins class= "diff-chg">If the document has been set to</ins> <a href= "#quirks"><ins class="diff-chg">quirks mode</ins></a> <ins class= "diff-chg">and the</ins> <a href="#content-type8" title= "Content-Type"><ins class="diff-chg">Content-Type metadata</ins></a> <ins class="diff-chg">of the external resource is not a supported style sheet type, the user agent must instead assume it to be</ins> <code title=""><ins class= "diff-chg">text/css</ins></code> . <h5 id="link-type13"><del class= "diff-old">4.12.3.17.</del> <ins class= "diff-chg">4.12.3.16.</ins> Link type " <dfn id="sidebar" title="rel-sidebar"><code>sidebar</code></dfn> "</h5> The <code title="rel-sidebar"><a href= "#sidebar">sidebar</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href= "#a">a</a></code> , and <code><a href="#area">area</a></code> elements. For <code><a href="#link">link</a></code> elements, it creates a <a href="#hyperlink1" title= "hyperlink link">hyperlink</a> . The <code title="rel-sidebar"><a href= "#sidebar">sidebar</a></code> keyword indicates that the referenced document, if retrieved, is intended to be shown in a <a href= "#secondary0">secondary browsing context</a> (if possible), instead of in the current <a href="#browsing1">browsing context</a> . A <a href="#hyperlinks" title="hyperlink">hyperlink element</a> with with the <code title="rel-sidebar"><a href= "#sidebar">sidebar</a></code> keyword specified is a <dfn id= "sidebar0" title="rel-sidebar-hyperlink">sidebar hyperlink</dfn> . <h5 id="link-type14"><del class= "diff-old">4.12.3.18.</del> <ins class= "diff-chg">4.12.3.17.</ins> Link type " <dfn id="tag" title= "rel-tag"><code>tag</code></dfn> "</h5> The <code title="rel-tag"><a href="#tag">tag</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href="#a">a</a></code> , and <code><a href= "#area">area</a></code> elements. For <code><a href= "#link">link</a></code> elements, it creates a <a href= "#hyperlink1" title="hyperlink link">hyperlink</a> . The <code title="rel-tag"><a href="#tag">tag</a></code> keyword indicates that the tag that the referenced document represents applies to the current document. <h5 id="hierarchical"><del class= "diff-old">4.12.3.19.</del> <ins class= "diff-chg">4.12.3.18.</ins> Hierarchical link types</h5> Some documents form part of a hierarchical structure of documents. A hierarchical structure of documents is one where each document can have various subdocuments. The document of which a document is a subdocument is said to be the document's parent . A document with no parent forms the top of the hierarchy. A document may be part of multiple hierarchies. <h6 id="link-type15"><del class= "diff-old">4.12.3.19.1.</del> <ins class= "diff-chg">4.12.3.18.1.</ins> Link type " <dfn id="index0" title="rel-index"><code>index</code></dfn> "</h6> The <code title="rel-index"><a href="#index0">index</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href="#a">a</a></code> , and <code><a href= "#area">area</a></code> elements. For <code><a href= "#link">link</a></code> elements, it creates a <a href= "#hyperlink1" title="hyperlink link">hyperlink</a> . The <code title="rel-index"><a href="#index0">index</a></code> keyword indicates that the document is part of a hierarchical structure, and that the link is leading to the document that is the top of the hierarchy. It conveys more information when used with the <code title="rel-up"><a href="#up">up</a></code> keyword (q.v.). Synonyms : For historical reasons, user agents must also treat the keywords " <code title="">top</code> ", " <code title="">contents</code> ", and " <code title="">toc</code> " like the <code title="rel-index"><a href="#index0">index</a></code> keyword. <h6 id="link-type16"><del class= "diff-old">4.12.3.19.2.</del> <ins class= "diff-chg">4.12.3.18.2.</ins> Link type " <dfn id="up" title="rel-up"><code>up</code></dfn> "</h6> The <code title="rel-up"><a href="#up">up</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href= "#a">a</a></code> , and <code><a href="#area">area</a></code> elements. For <code><a href="#link">link</a></code> elements, it creates a <a href="#hyperlink1" title= "hyperlink link">hyperlink</a> . The <code title="rel-up"><a href="#up">up</a></code> keyword indicates that the document is part of a hierarchical structure, and that the link is leading to the document that is the parent of the current document. The <code title="rel-up"><a href="#up">up</a></code> keyword may be repeated within a <code title="attr-hyperlink-rel"><a href= "#rel3">rel</a></code> attribute to indicate the hierarchical distance from the current document to the referenced document. Each <del class="diff-old">occurance</del> <ins class= "diff-chg">occurrence</ins> of the keyword represents one further level. If the <code title="rel-index"><a href= "#index0">index</a></code> keyword is also present, then the number of <code title="rel-up"><a href="#up">up</a></code> keywords is the depth of the current page relative to the top of the hierarchy. <ins class="diff-new">Only one link is created for the set of one or more</ins> <code title="rel-up"><a href="#up"><ins class= "diff-new">up</ins></a></code> <ins class="diff-new">keywords and, if present, the</ins> <code title="rel-index"><a href= "#index0"><ins class="diff-new">index</ins></a></code> <ins class= "diff-new">keyword.</ins> If the page is part of multiple hierarchies, then they should be described in different <a href="#paragraph" title= "paragraph">paragraphs</a> . User agents must scope any interpretation of the <code title="rel-up"><a href= "#up">up</a></code> and <code title="rel-index"><a href= "#index0">index</a></code> keywords together indicating the depth of the hierarchy to the <a href="#paragraph">paragraph</a> in which the link finds itself, if any, or to the document otherwise. When two links have both the <code title="rel-up"><a href= "#up">up</a></code> and <code title="rel-index"><a href= "#index0">index</a></code> keywords specified together in the same scope and contradict each other by having a different number of <code title="rel-up"><a href="#up">up</a></code> keywords, the link with the greater number of <code title="rel-up"><a href= "#up">up</a></code> keywords must be taken as giving the depth of the document. <div class="example"> This can be used to mark up a navigation style sometimes known as <del class="diff-old">breadcrumbs.</del> <ins class= "diff-chg">bread crumbs.</ins> In the following example, the current page can be reached via two paths. <pre> <nav> <p> <a href="/" rel="index up up up">Main</a> > <a href="/products/" rel="up up">Products</a> > <a href="/products/dishwashers/" rel="up">Dishwashers</a> > <a>Second hand</a> </p> <p> <a href="/" rel="index up up">Main</a> > <a href="/second-hand/" rel="up">Second hand</a> > <a>Dishwashers</a> </p> </nav> </pre></div> The <code title="dom-a-relList"><a href= "#rellist0">relList</a></code> DOM attribute (e.g. on the <code><a href="#a">a</a></code> element) does not currently represent multiple <code title="rel-up"><a href="#up">up</a></code> keywords (the interface hides duplicates). <h5 id="sequential0"><del class= "diff-old">4.12.3.20.</del> <ins class= "diff-chg">4.12.3.19.</ins> Sequential link types</h5> Some documents form part of a sequence of documents. A sequence of documents is one where each document can have a previous sibling and a next sibling . A document with no previous sibling is the start of its sequence, a document with no next sibling is the end of its sequence. A document may be part of multiple sequences. <h6 id="link-type17"><del class= "diff-old">4.12.3.20.1.</del> <ins class= "diff-chg">4.12.3.19.1.</ins> Link type " <dfn id="first" title="rel-first"><code>first</code></dfn> "</h6> The <code title="rel-first"><a href="#first">first</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href="#a">a</a></code> , and <code><a href= "#area">area</a></code> elements. For <code><a href= "#link">link</a></code> elements, it creates a <a href= "#hyperlink1" title="hyperlink link">hyperlink</a> . The <code title="rel-first"><a href="#first">first</a></code> keyword indicates that the document is part of a sequence, and that the link is leading to the document that is the first logical document in the sequence. Synonyms : For historical reasons, user agents must also treat the keywords " <code title="">begin</code> " and " <code title="">start</code> " like the <code title= "rel-first"><a href="#first">first</a></code> keyword. <h6 id="link-type18"><del class= "diff-old">4.12.3.20.2.</del> <ins class= "diff-chg">4.12.3.19.2.</ins> Link type " <dfn id="last" title="rel-last"><code>last</code></dfn> "</h6> The <code title="rel-last"><a href="#last">last</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href="#a">a</a></code> , and <code><a href= "#area">area</a></code> elements. For <code><a href= "#link">link</a></code> elements, it creates a <a href= "#hyperlink1" title="hyperlink link">hyperlink</a> . The <code title="rel-last"><a href="#last">last</a></code> keyword indicates that the document is part of a sequence, and that the link is leading to the document that is the last logical document in the sequence. Synonyms : For historical reasons, user agents must also treat the keyword " <code title="">end</code> " like the <code title="rel-last"><a href="#last">last</a></code> keyword. <h6 id="link-type19"><del class= "diff-old">4.12.3.20.3.</del> <ins class= "diff-chg">4.12.3.19.3.</ins> Link type " <dfn id="next" title="rel-next"><code>next</code></dfn> "</h6> The <code title="rel-next"><a href="#next">next</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href="#a">a</a></code> , and <code><a href= "#area">area</a></code> elements. For <code><a href= "#link">link</a></code> elements, it creates a <a href= "#hyperlink1" title="hyperlink link">hyperlink</a> . The <code title="rel-next"><a href="#next">next</a></code> keyword indicates that the document is part of a sequence, and that the link is leading to the document that is the next logical document in the sequence. <h6 id="link-type20"><del class= "diff-old">4.12.3.20.4.</del> <ins class= "diff-chg">4.12.3.19.4.</ins> Link type " <dfn id="prev" title="rel-prev"><code>prev</code></dfn> "</h6> The <code title="rel-prev"><a href="#prev">prev</a></code> keyword may be used with <code><a href="#link">link</a></code> , <code><a href="#a">a</a></code> , and <code><a href= "#area">area</a></code> elements. For <code><a href= "#link">link</a></code> elements, it creates a <a href= "#hyperlink1" title="hyperlink link">hyperlink</a> . The <code title="rel-prev"><a href="#prev">prev</a></code> keyword indicates that the document is part of a sequence, and that the link is leading to the document that is the previous logical document in the sequence. Synonyms : For historical reasons, user agents must also treat the keyword " <code title="">previous</code> " like the <code title="rel-prev"><a href="#prev">prev</a></code> keyword. <h5 id="other0"><del class= "diff-old">4.12.3.21.</del> <ins class= "diff-chg">4.12.3.20.</ins> Other link types</h5> Other than the types defined above, only types defined as extensions in the <a href= "http://wiki.whatwg.org/wiki/RelExtensions">WHATWG Wiki RelExtensions page</a> may be used with the <code title= "">rel</code> attribute on <code><a href="#link">link</a></code> , <code><a href="#a">a</a></code> , and <code><a href= "#area">area</a></code> elements. <a href= "#references">[WHATWGWIKI]</a> Anyone is free to edit the WHATWG Wiki RelExtensions page at any time to add a type. Extension types must be specified with the following information: <dl> <dt>Keyword</dt> <dd> The actual value being defined. The value should not be confusingly similar to any other defined value (e.g. differing only in case). </dd> <dt>Effect on... <code><a href="#link">link</a></code></dt> <dd> One of the following: <dl> <dt>not allowed</dt> <dd>The keyword is not allowed to be specified on <code><a href= "#link">link</a></code> elements.</dd> <dt>Hyperlink</dt> <dd>The keyword may be specified on a <code><a href= "#link">link</a></code> element; it creates a <a href="#hyperlink1" title="hyperlink link">hyperlink link</a> .</dd> <dt>External Resource</dt> <dd>The keyword may be specified on a <code><a href= "#link">link</a></code> element; it creates a <a href="#links1" title="external resource link">external resource link</a> .</dd> </dl> </dd> <dt>Effect on... <code><a href="#a">a</a></code> and <code><a href= "#area">area</a></code></dt> <dd> One of the following: <dl> <dt>not allowed</dt> <dd>The keyword is not allowed to be specified on <code><a href= "#a">a</a></code> and <code><a href="#area">area</a></code> elements.</dd> <dt>Hyperlink</dt> <dd>The keyword may be specified on <code><a href="#a">a</a></code> and <code><a href="#area">area</a></code> elements.</dd> </dl> </dd> <dt>Brief description</dt> <dd> A short description of what the keyword's meaning is. </dd> <dt>Link to more details</dt> <dd> A link to a more detailed description of the keyword's semantics and requirements. It could be another page on the Wiki, or a link to an external page. </dd> <dt>Synonyms</dt> <dd> A list of other keyword values that have exactly the same processing requirements. Authors must not use the values defined to be synonyms, they are only intended to allow user agents to support legacy content. </dd> <dt>Status</dt> <dd> One of the following: <dl> <dt>Proposal</dt> <dd>The keyword has not received wide peer review and approval. It is included for completeness because pages use the keyword. Pages should not use the keyword.</dd> <dt>Accepted</dt> <dd>The keyword has received wide peer review and approval. It has a specification that unambiguously defines how to handle pages that use the keyword, including when they use them in incorrect ways. Pages may use the keyword.</dd> <dt>Rejected</dt> <dd>The keyword has received wide peer review and it has been found to have significant problems. Pages must not use the keyword. When a keyword has this status, the "Effect on... <code><a href= "#link">link</a></code> " and "Effect on... <code><a href= "#a">a</a></code> and <code><a href="#area">area</a></code> " information should be set to "not allowed".</dd> </dl> If a keyword is added with the "proposal" status and found to be redundant with existing values, it should be removed and listed as a synonym for the existing value. If a keyword is added with the "proposal" status and found to be harmful, then it should be changed to "rejected" status, and its "Effect on..." information should be changed accordingly. </dd> </dl> Conformance checkers must use the information given on the WHATWG Wiki RelExtensions page to establish if a value not explicitly defined in this specification is allowed or not. When an author uses a new type not defined by either this specification or the Wiki page, conformance checkers should offer to add the value to the Wiki, with the details described above, with the "proposal" status. This specification does not define how new values will get approved. It is expected that the Wiki will have a community that addresses this. <h3 id="interfaces"><del class= "diff-old">4.13.</del> <ins class="diff-chg">4.13</ins> Interfaces for URI manipulation</h3> An interface that has a complement of <dfn id= "uri-decomposition">URI decomposition attributes</dfn> will have seven attributes with the following definitions: <pre class="idl"> attribute DOMString <a href="#protocol0" title= "dom-uda-protocol">protocol</a>; attribute DOMString <a href="#host0" title= "dom-uda-host">host</a>; attribute DOMString <a href="#hostname0" title= "dom-uda-hostname">hostname</a>; attribute DOMString <a href="#port0" title= "dom-uda-port">port</a>; attribute DOMString <a href="#pathname0" title= "dom-uda-pathname">pathname</a>; attribute DOMString <a href="#search1" title= "dom-uda-search">search</a>; attribute DOMString <a href="#hash0" title= "dom-uda-hash">hash</a>; </pre> The attributes defined to be URI decomposition attributes must act as described for the attributes with the same corresponding names in this section. In addition, an interface with a complement of URI decomposition attributes will define an <dfn id="input" title= "concept-uda-input">input</dfn> , which is a URI that the attributes act on, and a <dfn id="common3" title= "concept-uda-setter">common setter action</dfn> , which is a set of steps invoked when any of the attributes' setters are invoked. The seven URI decomposition attributes have similar requirements. On getting, if the <a href="#input" title= "concept-uda-input">input</a> fulfills the condition given in the "getter condition" column corresponding to the attribute in the table below, the user agent must return the part of the <a href= "#input" title="concept-uda-input">input</a> URI given in the "component" column, with any prefixes specified in the "prefix" column appropriately added to the start of the string and any suffixes specified in the "suffix" column appropriately added to the end of the string. Otherwise, the attribute must return the empty string. On setting, the new value must first be mutated as described by the "setter preprocessor" column, then mutated by %-escaping any characters in the new value that are not valid in the relevant component as given by the "component" column. Then, if the resulting new value fulfills the condition given in the "setter condition" column, the user agent must make a new string <var title="">output</var> by replacing the component of the URI given by the "component" column in the <a href="#input" title= "concept-uda-input">input</a> URI with the new value; otherwise, the user agent must let <var title="">output</var> be equal to the <a href="#input" title="concept-uda-input">input</a> . Finally, the user agent must invoke the <a href="#common3" title= "concept-uda-setter">common setter action</a> with the value of <var title="">output</var> . <ins class="diff-new">When replacing a component in the URI, if the component is part of an optional group in the URI syntax consisting of a character followed by the component, the component (including its prefix character) must be included even if the new value is the empty string.</ins> <ins class="diff-new">The previous paragraph applies in particular to the "</ins> <code title= "">:</code><ins class="diff-new">" before a <port> component, the "</ins> <code title=""><ins class="diff-new">?</ins></code> <ins class="diff-new">" before a <query> component, and the "</ins> <code title=""><ins class="diff-new">#</ins></code> <ins class="diff-new">" before a <fragment> component.</ins> The rules for parsing and constructing URIs are described in RFC 3986 and RFC 3987. <a href="#references">[RFC3986]</a> <a href= "#references">[RFC3987]</a> <table> <thead> <tr> <th>Attribute</th> <th>Component</th> <th>Getter Condition</th> <th>Prefix</th> <th>Suffix</th> <th>Setter Preprocessor</th> <th>Setter Condition</th> </tr> </thead> <tbody> <tr> <td><dfn id="protocol0" title= "dom-uda-protocol"><code>protocol</code></dfn></td> <td><scheme></td> <td>—</td> <td>—</td> <td>U+003A COLON (" <code title="">:</code> ")</td> <td>Remove all trailing U+003A COLON (" <code title="">:</code> ") characters</td> <td>The new value is not the empty string</td> </tr> <tr> <td><dfn id="host0" title= "dom-uda-host"><code>host</code></dfn></td> <td><a href="#lthostportgt"><hostport></a></td> <td><a href="#input" title="concept-uda-input">input</a> is hierarchical and uses a server-based naming authority</td> <td>—</td> <td>—</td> <td>—</td> <td>—</td> </tr> <tr> <td><dfn id="hostname0" title= "dom-uda-hostname"><code>hostname</code></dfn></td> <td><host>/<ihost></td> <td><a href="#input" title="concept-uda-input">input</a> is hierarchical and uses a server-based naming authority</td> <td>—</td> <td>—</td> <td>Remove all leading U+002F SOLIDUS (" <code title="">/</code> ") characters</td> <td>—</td> </tr> <tr> <td><dfn id="port0" title= "dom-uda-port"><code>port</code></dfn></td> <td><port></td> <td><a href="#input" title="concept-uda-input">input</a> is hierarchical and uses a server-based naming authority</td> <td>—</td> <td>—</td> <td>Remove any characters in the new value that are not in the range U+0030 DIGIT ZERO .. U+0039 DIGIT <del class="diff-old">NINE The new value is not</del> <ins class="diff-chg">NINE. If</ins> the <del class="diff-old">empty</del> <ins class= "diff-chg">resulting</ins> string <ins class="diff-new">is empty, set it to a single U+0030 DIGIT ZERO character ('0').</ins></td> <td><ins class="diff-new">—</ins></td> </tr> <tr> <td><dfn id="pathname0" title= "dom-uda-pathname"><code>pathname</code></dfn></td> <td><abs_path></td> <td><a href="#input" title="concept-uda-input">input</a> is hierarchical</td> <td>—</td> <td>—</td> <td>If it has no leading U+002F SOLIDUS (" <code title="">/</code> ") character, prepend a U+002F SOLIDUS (" <code title="">/</code> ") character to the new value</td> <td>—</td> </tr> <tr> <td><dfn id="search1" title= "dom-uda-search"><code>search</code></dfn></td> <td><query></td> <td><a href="#input" title="concept-uda-input">input</a> is hierarchical</td> <td>U+003F QUESTION MARK (" <code title="">?</code> ")</td> <td>—</td> <td>Remove one leading U+003F QUESTION MARK (" <code title= "">?</code> ") character, if any</td> <td>—</td> </tr> <tr> <td><dfn id="hash0" title= "dom-uda-hash"><code>hash</code></dfn></td> <td><fragment></td> <td>Fragment identifier is longer than zero characters</td> <td>U+0023 NUMBER SIGN (" <code title="">#</code> ")</td> <td>—</td> <td>Remove one leading U+0023 NUMBER SIGN (" <code title= "">#</code> ") character, if any</td> <td>—</td> </tr> </tbody> </table> The <dfn id="lthostportgt"><hostport></dfn> component is defined as being the <host>/<ihost> component, followed by a colon and the <port> component, but with the colon and <port> component omitted if the given port matches the default port for the protocol given by the <scheme> component. <h2 id="editing">5. <dfn id= "editing0">Editing</dfn></h2> This section describes various features that allow authors to enable users to edit documents and parts of documents interactively. <h3 id="editing-intro"><del class= "diff-old">5.1.</del> <ins class="diff-chg">5.1</ins> Introduction</h3> This section is non-normative. Would be nice to explain how these features work together. <h3 id="contenteditable"><del class= "diff-old">5.2.</del> <ins class="diff-chg">5.2</ins> The <code title="attr-contenteditable"><a href= "#contenteditable0">contenteditable</a></code> attribute</h3> The <dfn id="contenteditable0" title= "attr-contenteditable"><code>contenteditable</code></dfn> attribute is a common attribute. User agents must support this attribute on all <a href="#html-elements">HTML elements</a> . The <code title="attr-contenteditable"><a href= "#contenteditable0">contenteditable</a></code> attribute is an <a href="#enumerated">enumerated attribute</a> whose keywords are the empty string, <code title="">true</code> , and <code title= "">false</code> . The empty string and the <code title= "">true</code> keyword map to the true state. The <code title="">false</code> keyword maps to the false <ins class="diff-new">state. In addition, there is a third state, the</ins> <ins class="diff-new">inherit</ins> state, which is <del class="diff-old">also</del> the <del class= "diff-old">invalid</del> <ins class="diff-chg">missing</ins> value default <del class="diff-old">. There is no</del> <ins class= "diff-chg">(and the</ins> <del class="diff-old">missing</del> <ins class="diff-chg">invalid</ins> value default <del class= "diff-old">.</del> <ins class="diff-chg">).</ins> If an <a href="#html-elements" title="HTML elements">HTML element</a> has a <code title="attr-contenteditable"><a href= "#contenteditable0">contenteditable</a></code> attribute set to the true state, or <ins class="diff-new">it has its</ins> <code title= "attr-contenteditable"><a href="#contenteditable0"><ins class= "diff-new">contenteditable</ins></a></code> <ins class= "diff-new">attribute set to the inherit state and</ins> if its nearest ancestor <a href="#html-elements" title= "HTML elements">HTML element</a> with the <code title= "attr-contenteditable"><a href= "#contenteditable0">contenteditable</a></code> attribute set <ins class="diff-new">to a state other than the inherit state</ins> has its attribute set to the true state, or if it <del class= "diff-old">has no</del> <ins class="diff-chg">and its</ins> ancestors <del class="diff-old">with the</del> <ins class= "diff-chg">all have their</ins> <code title= "attr-contenteditable"><a href= "#contenteditable0">contenteditable</a></code> attribute set <ins class="diff-new">to the inherit state</ins> but the <code>Document</code> has <code title= "dom-document-designMode"><a href= "#designMode">designMode</a></code> enabled, then the UA must treat the element as <dfn id="editable0">editable</dfn> (as described below). Otherwise, either the <a href="#html-elements" title= "HTML elements">HTML element</a> has a <code title= "attr-contenteditable"><a href= "#contenteditable0">contenteditable</a></code> attribute set to the false state, or its <code title="attr-contenteditable"><a href= "#contenteditable0"><ins class= "diff-new">contenteditable</ins></a></code> <ins class= "diff-new">attribute is set to the inherit state and its</ins> nearest ancestor <a href="#html-elements" title= "HTML elements">HTML element</a> with the <code title= "attr-contenteditable"><a href= "#contenteditable0">contenteditable</a></code> attribute set <del class="diff-old">is not editable , or it</del> <ins class= "diff-chg">to a state other than the inherit state</ins> has <del class="diff-old">no ancestor with</del> <ins class= "diff-chg">its attribute set to</ins> the <ins class= "diff-new">false state, or all its ancestors have their</ins> <code title="attr-contenteditable"><a href= "#contenteditable0">contenteditable</a></code> attribute set <ins class="diff-new">to the inherit state</ins> and the <code>Document</code> itself has <code title= "dom-document-designMode"><a href= "#designMode">designMode</a></code> <del class="diff-old">disabled, and</del> <ins class="diff-chg">disabled; either way,</ins> the element is <del class="diff-old">thus</del> not editable. The <dfn id="contenteditable1" title= "dom-contentEditable"><code>contentEditable</code></dfn> DOM attribute, on getting, must return the string " <code title= ""><del class="diff-old">inherit</del> <ins class= "diff-chg">true</ins></code> " if the content attribute <del class= "diff-old">isn't set, "</del> <ins class="diff-chg">is set to the</ins> true <ins class="diff-new">state,</ins> <code title= ""><ins class="diff-new">false</ins></code> " if the <ins class= "diff-new">content</ins> attribute is set <del class="diff-old">and has</del> <ins class="diff-chg">to</ins> the <del class= "diff-old">true</del> <ins class="diff-chg">false</ins> state, and " <code title=""><del class="diff-old">false</del> <ins class= "diff-chg">inherit</ins></code> " otherwise. On setting, if the new value is case-insensitively equal to the string " <code title= "">inherit</code> " then the content attribute must be removed, if the new value is case-insensitively equal to the string " <code title="">true</code> <ins class="diff-new">"</ins> then the content attribute must be set to the string " <code title="">true <del class="diff-old">,</del></code> <ins class="diff-chg">",</ins> if the new value is case-insensitively equal to the string " <code title="">false</code> <ins class="diff-new">"</ins> then the content attribute must be set to the string " <code title="">false <del class="diff-old">,</del></code> <ins class="diff-chg">",</ins> and otherwise the attribute setter must raise a <code>SYNTAX_ERR</code> exception. <ins class="diff-new">The</ins> <dfn id="iscontenteditable" title="dom-isContentEditable"><code><ins class= "diff-new">isContentEditable</ins></code></dfn> <ins class= "diff-new">DOM attribute, on getting, must return true if the element is</ins> <a href="#editable0"><ins class= "diff-new">editable</ins></a> ,<ins class="diff-new">and false otherwise.</ins> If an element is <a href="#editable0">editable</a> and its parent element is not, or if an element is <a href= "#editable0">editable</a> and it has no parent element, then the element is an <dfn id="editing1">editing host</dfn> . Editable elements can be nested. User agents must make editing hosts focusable (which <del class="diff-old">typicially</del> <ins class= "diff-chg">typically</ins> means they enter the <a href="#tabindex" title="attr-tabindex">tab order</a> ). An editing host can contain non-editable sections, these are handled as described below. An editing host can contain non-editable sections that contain further editing hosts. When an editing host has focus, it must have a <dfn id= "caret">caret position</dfn> that specifies where the current editing position is. It may also have a <a href="#a-selection" title="the selection">selection</a> . How the caret and selection are represented depends entirely on the UA. <h4 id="user-editing"><del class= "diff-old">5.2.1.</del> <ins class="diff-chg">5.2.1</ins> User editing actions</h4> There are several actions that the user agent should allow the user to perform while the user is interacting with an editing host. How exactly each action is triggered is not defined for every action, but when it is not defined, suggested key bindings are provided to guide implementors. <dl> <dt>Move the caret</dt> <dd> User agents must allow users to move the caret to any position within an editing host, even into nested editable elements. This could be triggered as the default action of <code title= "event-keydown">keydown</code> events with various key identifiers and as the default action of <code title= "event-mousedown">mousedown</code> events. </dd> <dt>Change the selection</dt> <dd> User agents must allow users to change <a href= "#a-selection">the selection</a> within an editing host, even into nested editable elements. <ins class="diff-new">User agents may prevent selections from being made in ways that cross from editable elements into non-editable elements (e.g. by making each non-editable descendant atomically selectable, but not allowing text selection within them).</ins> This could be triggered as the default action of <code title="event-keydown">keydown</code> events with various key identifiers and as the default action of <code title="event-mousedown">mousedown</code> events. </dd> <dt id="contenteditable-insertText">Insert text</dt> <dd> This action must be triggered as the default action of a <code title="event-textInput">textInput</code> event, and may be triggered by other commands as well. It must cause the user agent to insert the specified text (given by the event object's <code title="">data</code> attribute in the case of the <code title="event-textInput">textInput</code> event) at the caret. If the caret is positioned somewhere where <a href= "#phrasing0">phrasing content</a> is not allowed (e.g. inside an empty <code><a href="#ol">ol</a></code> element), then the user agent must not insert the text directly at the caret position. In such cases the <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> is UA-dependent, but user agents must not, in response to a request to insert text, generate a DOM that is less conformant than the DOM prior to the request. User agents should allow users to insert new paragraphs into elements that contains only content other than paragraphs. <div class="example"> For example, given the markup: <pre> <section> <dl> <dt> Ben </dt> <dd> Goat </dd> </dl> </section> </pre> ...the user agent should allow the user to insert <code><a href= "#p">p</a></code> elements before and after the <code><a href= "#dl">dl</a></code> element, as children of the <code><a href= "#section">section</a></code> element. </div> </dd> <dt id="contenteditable-breakBlock">Break block</dt> <dd> UAs should offer a way for the user to request that the current paragraph be broken at the caret, e.g. as the default action of a <code title="event-keydown">keydown</code> event whose identifier is the "Enter" key and that has no modifiers set. The exact <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> is UA-dependent, but user agents must not, in response to a request to break a paragraph, generate a DOM that is less conformant than the DOM prior to the request. </dd> <dt id="contenteditable-br">Insert a line separator</dt> <dd> UAs should offer a way for the user to request an explicit line break at the caret position without breaking the paragraph, e.g. as the default action of a <code title="event-keydown">keydown</code> event whose identifier is the "Enter" key and that has a shift modifier set. Line separators are typically found within a poem verse or an address. To insert a line break, the user agent must insert a <code><a href="#br">br</a></code> element. If the caret is positioned somewhere where <a href= "#phrasing0">phrasing content</a> is not allowed (e.g. in an empty <code><a href="#ol">ol</a></code> element), then the user agent must not insert the <code><a href="#br">br</a></code> element directly at the caret position. In such cases the <del class= "diff-old">behaviour</del> <ins class="diff-chg">behavior</ins> is UA-dependent, but user agents must not, in response to a request to insert a line separator, generate a DOM that is less conformant than the DOM prior to the request. </dd> <dt id="contenteditable-delete">Delete</dt> <dd> UAs should offer a way for the user to delete text and elements, <ins class="diff-new">including non-editable descendants,</ins> e.g. as the default action of <code title= "event-keydown">keydown</code> events whose identifiers are "U+0008" or "U+007F". Five edge cases in particular need to be considered carefully when implementing this feature: backspacing at the start of an element, backspacing when the caret is immediately after an element, forward-deleting at the end of an element, forward-deleting when the caret is immediately before an element, and deleting a <a href="#a-selection" title= "the selection">selection</a> whose start and end points do not share a common parent node. In any case, the exact <del class="diff-old">behaviour</del> <ins class="diff-chg">behavior</ins> is UA-dependent, but user agents must not, in response to a request to delete text or an element, generate a DOM that is less conformant than the DOM prior to the request. </dd> <dt id="contenteditable-wrapSemantic">Insert, and wrap text in, semantic elements</dt> <dd> UAs should offer <del class="diff-old">a way for the user to mark text as having stress emphasis and as being important , and may offer</del> the user the ability to mark text and paragraphs with <del class="diff-old">other semantics.</del> <ins class= "diff-chg">semantics that HTML can express.</ins> UAs should similarly offer a way for the user to insert empty semantic elements <del class="diff-old">(such as, again, em , strong , and others)</del> to subsequently fill by entering text manually. UAs should also offer a way to remove those semantics from marked up text, and to remove empty semantic element that have been inserted. <ins class="diff-new">In response to a request from a user to mark text up in italics, user agents should use the</ins> <code><a href="#i"><ins class="diff-new">i</ins></a></code> <ins class="diff-new">element to represent the semantic. The</ins> <code><a href="#em"><ins class="diff-new">em</ins></a></code> <ins class="diff-new">element should be used only if the user agent is sure that the user means to indicate stress emphasis.</ins> <ins class="diff-new">In response to a request from a user to mark text up in bold, user agents should use the</ins> <code><a href="#b"><ins class="diff-new">b</ins></a></code> <ins class="diff-new">element to represent the semantic. The</ins> <code><a href="#strong"><ins class= "diff-new">strong</ins></a></code> <ins class="diff-new">element should be used only if the user agent is sure that the user means to indicate importance.</ins> The exact <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> is UA-dependent, but user agents must not, in response to a request to wrap semantics around some text or to insert or remove a semantic element, generate a DOM that is less conformant than the DOM prior to the request. </dd> <dt>Select and move non-editable elements nested inside editing hosts</dt> <dd> UAs should offer a way for the user to move images and other non-editable parts around the content within an editing host. This may be done using the <a href="#drag-and">drag and drop</a> mechanism. User agents must not, in response to a request to move non-editable elements nested inside editing hosts, generate a DOM that is less conformant than the DOM prior to the request. </dd> <dt>Edit form controls nested inside editing hosts</dt> <dd> When an <a href="#editable0">editable</a> form control is edited, the changes must be reflected in both its current value and its default value. For <code>input</code> elements this means updating the <code title= "dom-input-defaultValue">defaultValue</code> DOM attribute as well as the <code title="dom-input-value">value</code> DOM attribute; for <code>select</code> elements it means updating the <code>option</code> elements' <code title= "dom-option-defaultSelected">defaultSelected</code> DOM attribute as well as the <code title="dom-option-selected">selected</code> DOM attribute; for <code>textarea</code> elements this means updating the <code title= "dom-textarea-defaultValue">defaultValue</code> DOM attribute as well as the <code title="dom-textarea-value">value</code> DOM attribute. (Updating the <code title="">default*</code> DOM attributes causes content attributes to be updated as well.) </dd> </dl> User agents may perform several commands per user request; for example if the user selects a block of text and hits <kbd><kbd>Enter</kbd></kbd> , the UA might interpret that as a request to delete the content of <a href="#a-selection">the selection</a> followed by a request to break the paragraph at that position. <h4 id="making"><del class= "diff-old">5.2.2.</del> <ins class="diff-chg">5.2.2</ins> Making entire documents editable</h4> Documents have a <dfn id="designMode" title= "dom-document-designMode"><code>designMode</code></dfn> , which can be either enabled or disabled. The <code title="dom-document-designMode"><a href= "#designMode">designMode</a></code> DOM attribute on the <code>Document</code> object takes <del class= "diff-old">takes</del> two values, " <code title="">on</code> " and " <code title="">off</code> ". When it is set, the new value must be case-insensitively compared to these two values. If it matches the " <code title="">on</code> " value, then <code title= "dom-document-designMode"><a href= "#designMode">designMode</a></code> must be enabled, and if it matches the " <code title="">off</code> " value, then <code title= "dom-document-designMode"><a href= "#designMode">designMode</a></code> must be disabled. Other values must be ignored. When <code title="dom-document-designMode"><a href= "#designMode">designMode</a></code> is enabled, the DOM attribute must return the value " <code title="">on</code> ", and when it is disabled, it must return the value " <code title="">off</code> ". The last state set must persist until the document is destroyed or the state is changed. Initially, documents must have their <code title="dom-document-designMode"><a href= "#designMode">designMode</a></code> disabled. Enabling <code title="dom-document-designMode"><a href= "#designMode">designMode</a></code> <a href= "#designModeScriptBlocked">causes scripts in general to be disabled</a> and the document to become editable. <del class= "diff-old">When the Document has designMode enabled, event listeners registered on the document or any elements owned by the document must do nothing.</del> <h3 id="dnd"><del class="diff-old">5.3.</del> <ins class="diff-chg">5.3</ins> <dfn id="drag-and">Drag and drop</dfn></h3> This section defines an event-based drag-and-drop mechanism. This specification does not define exactly what a drag-and-drop operation actually is. On a visual medium with a pointing device, a drag operation could be the default action of a <code title= "event-mousedown">mousedown</code> event that is followed by a series of <code title="event-mousemove">mousemove</code> events, and the drop could be triggered by the mouse being released. On media without a pointing device, the user would probably have to explicitly indicate his intention to perform a drag-and-drop operation, stating what he wishes to drag and what he wishes to drop, respectively. However it is implemented, drag-and-drop operations must have a starting point (e.g. where the mouse was clicked, or the start of <a href="#a-selection">the selection</a> or element that was selected for the drag), may have any number of intermediate steps (elements that the mouse moves over during a drag, or elements that the user picks as possible drop points as he cycles through possibilities), and must either have an end point (the element above which the mouse button was released, or the element that was finally selected), or be canceled. The end point must be the last element selected as a possible drop point before the drop occurs (so if the operation is not canceled, there must be at least one element in the middle step). <h4 id="introduction4"><ins class= "diff-new">5.3.1</ins> <ins class= "diff-new">Introduction</ins></h4> <ins class="diff-new">This section is non-normative.</ins> <ins class="diff-new">It's also currently non-existent.</ins> <h4 id="the-dragevent"><del class= "diff-old">5.3.1.</del> <ins class="diff-chg">5.3.2</ins> The <code><a href="#dragevent">DragEvent</a></code> and <code><a href="#datatransfer0">DataTransfer</a></code> interfaces</h4> The drag-and-drop processing model involves several events. They all use the <code><a href="#dragevent">DragEvent</a></code> interface. <pre class="idl"> interface <dfn id="dragevent">DragEvent</dfn> : UIEvent { readonly attribute <a href= "#datatransfer0">DataTransfer</a> <a href="#datatransfer" title= "dom-DragEvent-dataTransfer">dataTransfer</a>; void <a href="#initdragevent" title= "dom-DragEvent-initDragEvent">initDragEvent</a>(in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in AbstractView viewArg, in long detailArg, in <a href="#datatransfer0">DataTransfer</a> dataTransferArg); void <a href="#initdrageventns" title= "dom-DragEvent-initDragEventNS">initDragEventNS</a>(in DOMString namespaceURIArg, in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in AbstractView viewArg, in long detailArg, in <a href="#datatransfer0">DataTransfer</a> dataTransferArg); }; </pre> We should have modifier key information in here too (shift/ctrl, etc), like with mouse events and like with the context menu event. The <dfn id="initdragevent" title= "dom-DragEvent-initDragEvent"><code>initDragEvent()</code></dfn> and <dfn id="initdrageventns" title= "dom-DragEvent-initDragEventNS"><code>initDragEventNS()</code></dfn> methods must initialise the event in a manner analogous to the similarly-named methods in the DOM3 Events interfaces. <a href= "#references">[DOM3EVENTS]</a> The <dfn id="datatransfer" title= "dom-DragEvent-dataTransfer"><code>dataTransfer</code></dfn> attribute of the <code><a href="#dragevent">DragEvent</a></code> interface represents the context information for the event. <del class="diff-old">When a DragEvent object is created, a new DataTransfer object must be created and assigned to the dataTransfer context information field of the event object.</del> <pre class="idl"> interface <dfn id="datatransfer0">DataTransfer</dfn> { attribute DOMString <a href="#dropeffect" title= "dom-DataTransfer-dropEffect">dropEffect</a>; attribute DOMString <a href="#effectallowed" title= "dom-DataTransfer-effectAllowed">effectAllowed</a>; <ins class="diff-new"> readonly attribute DOMStringList <a href= "#types" title="dom-DataTransfer-types">types</a>; </ins> void <a href="#cleardata" title= "dom-DataTransfer-clearData">clearData</a>(in DOMString format); void <a href="#setdata" title= "dom-DataTransfer-setData">setData</a>(in DOMString format, in DOMString data); DOMString <a href="#getdata" title= "dom-DataTransfer-getData">getData</a>(in DOMString format); void <a href="#setdragimage" title= "dom-DataTransfer-setDragImage">setDragImage</a>(in Element image, in long x, in long y); void <a href="#addelement" title= "dom-DataTransfer-addElement">addElement</a>(in Element element); }; </pre> <code><a href="#datatransfer0">DataTransfer</a></code> objects can conceptually contain various kinds of data. When a <code><del class="diff-old">DragEvent event object is initialised, the</del> <a href= "#datatransfer0">DataTransfer</a></code> object <del class= "diff-old">created for the event's dataTransfer member</del> <ins class="diff-chg">is created, it</ins> must be <del class= "diff-old">initialised</del> <ins class= "diff-chg">initialized</ins> as follows: <ul> <li>The <code><a href="#datatransfer0">DataTransfer</a></code> object must initially contain no data, no elements, and have no associated image.</li> <li>The <code><a href="#datatransfer0">DataTransfer</a></code> object's <code title="dom-DataTransfer-effectAllowed"><a href= "#effectallowed">effectAllowed</a></code> attribute must be set to " <code title="">uninitialized</code> ".</li> <li>The <code title="dom-DataTransfer-dropEffect"><a href= "#dropeffect">dropEffect</a></code> attribute must be set to " <code title="">none</code> ".</li> </ul> The <dfn id="dropeffect" title= "dom-DataTransfer-dropEffect"><code>dropEffect</code></dfn> attribute controls the drag-and-drop feedback that the user is given during a drag-and-drop operation. The attribute must ignore any attempts to set it to a value other than <code title="">none</code> , <code title="">copy</code> , <code title="">link</code> , and <code title="">move</code> . On getting, the attribute must return the last of those four values that it was set to. The <dfn id="effectallowed" title= "dom-DataTransfer-effectAllowed"><code>effectAllowed</code></dfn> attribute is used in the drag-and-drop processing model to initialise the <code title="dom-DataTransfer-dropEffect"><a href= "#dropeffect">dropEffect</a></code> attribute during the <code title="event-dragenter"><a href= "#dragenter">dragenter</a></code> and <code title= "event-dragover"><a href="#dragover">dragover</a></code> events. The attribute must ignore any attempts to set it to a value other than <code title="">none</code> , <code title="">copy</code> , <code title="">copyLink</code> , <code title="">copyMove</code> , <code title="">link</code> , <code title="">linkMove</code> , <code title="">move</code> , <code title="">all</code> , and <code title="">uninitialized</code> . On getting, the attribute must return the last of those values that it was set to. <code><a href="#datatransfer0">DataTransfer</a></code> objects can hold pieces of data, each associated with a unique format. Formats are generally given by MIME types, with some values special-cased for legacy reasons. The <dfn id="cleardata" title= "dom-DataTransfer-clearData"><code>clearData( <var title= "">format</var> )</code></dfn> method must clear the <code><a href= "#datatransfer0">DataTransfer</a></code> object of any data associated with the given <var title="">format</var> . If <var title="">format</var> is the value " <code title= "">Text</code> ", then it must be treated as " <code title= "">text/plain</code> ". If the <var title="">format</var> is " <code title="">URL</code> ", then it must be treated as " <code title="">text/uri-list</code> ". The <dfn id="setdata" title= "dom-DataTransfer-setData"><code>setData( <var title= "">format</var> , <var title="">data</var> )</code></dfn> method must add <var title="">data</var> to the data stored in the <code><a href="#datatransfer0">DataTransfer</a></code> object, <del class="diff-old">labelled</del> <ins class= "diff-chg">labeled</ins> as being of the type <var title= "">format</var> . This must replace any previous data that had been set for that format. If <var title="">format</var> is the value " <code title="">Text</code> ", then it must be treated as " <code title="">text/plain</code> ". If the <var title= "">format</var> is " <code title="">URL</code> ", then it must be treated as " <code title="">text/uri-list</code> ". The <dfn id="getdata" title= "dom-DataTransfer-getData"><code>getData( <var title= "">format</var> )</code></dfn> method must return the data that is associated with the type <var title="">format</var> , if any, and must return the empty string otherwise. If <var title= "">format</var> is the value " <code title="">Text</code> ", then it must be treated as " <code title="">text/plain</code> ". If the <var title="">format</var> is " <code title="">URL</code> ", then the data associated with the " <code title="">text/uri-list</code> " format must be parsed as appropriate for <code title= "">text/uri-list</code> data, and the first URI from the list must be returned. If there is no data with that format, or if there is but it has no URIs, then the method must return the empty string. <a href="#references">[RFC2483]</a> The <dfn id="types" title= "dom-DataTransfer-types"><code><ins class= "diff-new">types</ins></code></dfn> <ins class="diff-new">attribute must return a live</ins> <code><ins class= "diff-new">DOMStringList</ins></code> <ins class="diff-new">that contains the list of formats that are stored in the</ins> <code><a href="#datatransfer0"><ins class= "diff-new">DataTransfer</ins></a></code> <ins class= "diff-new">object.</ins> <ins class="diff-new">The</ins> <dfn id="setdragimage" title= "dom-DataTransfer-setDragImage"><code>setDragImage( <var title= "">element</var> , <var title="">x</var> , <var title="">y</var> )</code></dfn> method sets which element to use <a href= "#base-dnd-feedback">to generate the drag feedback</a> . The <var title="">element</var> argument can be any <code>Element</code> ; if it is an <code><a href= "#img">img</a></code> element, then the user agent should use the element's image (at its intrinsic size) to generate the feedback, otherwise the user agent should base the feedback on the given element (but the exact mechanism for doing so is not specified). The <dfn id="addelement" title= "dom-DataTransfer-addElement"><code>addElement( <var title= "">element</var> )</code></dfn> method is an alternative way of specifying how the user agent is to <a href= "#base-dnd-feedback">render the drag feedback</a> . It adds an element to the <code><a href= "#datatransfer0">DataTransfer</a></code> object. <h4 id="events1"><del class= "diff-old">5.3.2.</del> <ins class="diff-chg">5.3.3</ins> Events fired during a drag-and-drop action</h4> The following events are involved in the drag-and-drop model. Whenever the processing model described below causes one of these events to be fired, the event fired must use the <code><a href= "#dragevent">DragEvent</a></code> interface defined above, must have the bubbling and cancelable <del class= "diff-old">behaviours</del> <ins class="diff-chg">behaviors</ins> given in the table below, and must have the context information set up as described after the table, with the <code title= "dom-UIEvent-view">view</code> attribute set to the view with which the user interacted to trigger the drag-and-drop event, and the <code title="dom-UIEvent-detail">detail</code> attribute set to zero. <table> <thead> <tr> <th>Event Name</th> <th>Target</th> <th>Bubbles?</th> <th>Cancelable?</th> <th><code title="dom-DataTransfer-addElement"><a href= "#addelement">dataTransfer</a></code></th> <th><code title="dom-DataTransfer-effectAllowed"><a href= "#effectallowed">effectAllowed</a></code></th> <th><code title="dom-DataTransfer-dropEffect"><a href= "#dropeffect">dropEffect</a></code></th> <th>Default Action</th> </tr> </thead> <tbody> <tr> <td><dfn id="dragstart" title= "event-dragstart"><code>dragstart</code></dfn></td> <td><a href="#source2">Source node</a></td> <td>✓ Bubbles</td> <td>✓ Cancelable</td> <td>Contains <a href="#source2">source node</a> unless a selection is being dragged, in which case it is empty</td> <td><code title="">uninitialized</code></td> <td><code title="">none</code></td> <td>Initiate the drag-and-drop operation</td> </tr> <tr> <td><dfn id="drag" title="event-drag"><code>drag</code></dfn></td> <td><a href="#source2">Source node</a></td> <td>✓ Bubbles</td> <td>✓ Cancelable</td> <td>Empty</td> <td><a href="#effectAllowed-initialization">Same as last event</a></td> <td><code title="">none</code></td> <td>Continue the drag-and-drop operation</td> </tr> <tr> <td><dfn id="dragenter" title= "event-dragenter"><code>dragenter</code></dfn></td> <td><a href="#immediate">Immediate user selection</a> or <a href= "#the-body1">the body element</a></td> <td>✓ Bubbles</td> <td>✓ Cancelable</td> <td>Empty</td> <td><a href="#effectAllowed-initialization">Same as last event</a></td> <td><a href="#dropEffect-initialization">Based on <code>effectAllowed</code> value</a></td> <td>Reject <a href="#immediate">immediate user selection</a> as potential <a href="#current2" title="current target element">target element</a></td> </tr> <tr> <td><dfn id="dragleave" title= "event-dragleave"><code>dragleave</code></dfn></td> <td><a href="#current2" title="current target element">Previous target element</a></td> <td>✓ Bubbles</td> <td>—</td> <td>Empty</td> <td><a href="#effectAllowed-initialization">Same as last event</a></td> <td><code title="">none</code></td> <td>None</td> </tr> <tr> <td><dfn id="dragover" title= "event-dragover"><code>dragover</code></dfn></td> <td><a href="#current2">Current target element</a></td> <td>✓ Bubbles</td> <td>✓ Cancelable</td> <td>Empty</td> <td><a href="#effectAllowed-initialization">Same as last event</a></td> <td><a href="#dropEffect-initialization">Based on <code>effectAllowed</code> value</a></td> <td>Reset the <a href="#current3">current drag operation</a> to "none"</td> </tr> <tr> <td><dfn id="drop" title="event-drop"><code>drop</code></dfn></td> <td><a href="#current2">Current target element</a></td> <td>✓ Bubbles</td> <td>✓ Cancelable</td> <td><code>getData()</code> returns data set in <code title= "dom-dragstart">dragstart</code> event</td> <td><a href="#effectAllowed-initialization">Same as last event</a></td> <td><a href="#current3">Current drag operation</a></td> <td>Varies</td> </tr> <tr> <td><dfn id="dragend" title= "event-dragend"><code>dragend</code></dfn></td> <td><a href="#source2">Source node</a></td> <td>✓ Bubbles</td> <td>—</td> <td>Empty</td> <td><a href="#effectAllowed-initialization">Same as last event</a></td> <td><a href="#current3">Current drag operation</a></td> <td>Varies</td> </tr> </tbody> </table> The <code title="dom-DragEvent-dataTransfer"><a href= "#datatransfer">dataTransfer</a></code> object's contents are empty except for <code title="event-dragstart"><a href= "#dragstart">dragstart</a></code> events and <code title= "event-drop"><a href="#drop">drop</a></code> events, for which the contents are set as described in the processing model, below. The <code title= "dom-DataTransfer-effectAllowed"><a href= "#effectallowed">effectAllowed</a></code> attribute must be set to " <code title="">uninitialized</code> " for <code title= "event-dragstart"><a href="#dragstart">dragstart</a></code> events, and to whatever value the field had after the last drag-and-drop event was fired for all other events (only counting events fired by the user agent for the purposes of the drag-and-drop model described below). The <code title= "dom-DataTransfer-dropEffect"><a href= "#dropeffect">dropEffect</a></code> attribute must be set to " <code title="">none</code> " for <code title= "event-dragstart"><a href="#dragstart">dragstart</a></code> , <code title="event-drag"><a href="#drag">drag</a></code> , and <code title="event-dragleave"><a href= "#dragleave">dragleave</a></code> events (except when stated otherwise in the algorithms given in the sections below), to the value corresponding to the <a href="#current3">current drag operation</a> for <code title="event-drop"><a href= "#drop">drop</a></code> and <code title="event-dragend"><a href= "#dragend">dragend</a></code> events, and to a value based on the <code title="dom-DataTransfer-effectAllowed"><a href= "#effectallowed">effectAllowed</a></code> attribute's value and to the drag-and-drop source, as given by the following table, for the remaining events ( <code title="event-dragenter"><a href= "#dragenter">dragenter</a></code> and <code title= "event-dragover"><a href="#dragover">dragover</a></code> ): <table> <thead> <tr> <th><code title="dom-DataTransfer-effectAllowed"><a href= "#effectallowed">effectAllowed</a></code></th> <th><code title="dom-DataTransfer-dropEffect"><a href= "#dropeffect">dropEffect</a></code></th> </tr> </thead> <tbody> <tr> <td><code title="">none</code></td> <td><code title="">none</code></td> </tr> <tr> <td><code title="">copy</code> , <code title="">copyLink</code> , <code title="">copyMove</code> , <code title="">all</code></td> <td><code title="">copy</code></td> </tr> <tr> <td><code title="">link</code> , <code title= "">linkMove</code></td> <td><code title="">link</code></td> </tr> <tr> <td><code title="">move</code></td> <td><code title="">move</code></td> </tr> <tr> <td><code title="">uninitialized</code> when what is being dragged is a selection from a text field</td> <td><code title="">move</code></td> </tr> <tr> <td><code title="">uninitialized</code> when what is being dragged is a selection</td> <td><code title="">copy</code></td> </tr> <tr> <td><code title="">uninitialized</code> when what is being dragged is an <code><a href="#a">a</a></code> element with an <code>href</code> attribute</td> <td><code title="">link</code></td> </tr> <tr> <td>Any other case</td> <td><code title="">copy</code></td> </tr> </tbody> </table> <h4 id="drag-and-drop"><del class= "diff-old">5.3.3.</del> <ins class="diff-chg">5.3.4</ins> Drag-and-drop processing model</h4> When the user attempts to begin a drag operation, the user agent must first determine what is being dragged. If the drag operation was invoked on a selection, then it is the selection that is being dragged. Otherwise, it is the first element, going up the ancestor chain, starting at the node that the user tried to drag, that has the DOM attribute <code title="dom-draggable"><a href= "#draggable0">draggable</a></code> set to true. If there is no such element, then nothing is being dragged, the drag-and-drop operation is never started, and the user agent must not continue with this algorithm. <code><a href="#img">img</a></code> elements and <code><a href="#a">a</a></code> elements with an <code title= "attr-hyperlink-href"><a href="#href6">href</a></code> attribute have their <code title="dom-draggable"><a href= "#draggable0">draggable</a></code> attribute set to true by default. If the user agent determines that something can be dragged, a <code title="event-dragstart"><a href= "#dragstart">dragstart</a></code> event must then be fired. If it is a selection that is being dragged, then this event must be fired on the node that the user started the drag on (typically the text node that the user originally clicked). If the user did not specify a particular node, for example if the user just told the user agent to begin a drag of "the selection", then the event must be fired on the deepest node that is a common ancestor of all parts of the selection. We should look into how browsers do other types (e.g. Firefox apparently also adds text/html for internal drag and drop of a selection). If it is not a selection that is being dragged, then the event must be fired on the element that is being dragged. The node on which the event is fired is the <dfn id= "source2">source node</dfn> . Multiple events are fired on this node during the course of the drag-and-drop operation. If it is a selection that is being dragged, the <code title= "dom-DragEvent-dataTransfer"><a href= "#datatransfer">dataTransfer</a></code> member of the event must be created with no nodes. Otherwise, it must be created containing just the <a href="#source2">source node</a> . Script can use the <code title="dom-DataTransfer-addElement"><a href= "#addelement">addElement()</a></code> method to add further elements to the list of what is being dragged. If it is a selection that is being dragged, the <code title= "dom-DragEvent-dataTransfer"><a href= "#datatransfer">dataTransfer</a></code> member of the event must have the text of the selection added to it as the data associated with the <code title="">text/plain</code> format. Otherwise, if it is an <code><a href="#img">img</a></code> element being dragged, then the value of the element's <code title="dom-img-src"><a href= "#src0">src</a></code> DOM attribute must be added, associated with the <code title="">text/uri-list</code> format. Otherwise, if it is an <code><a href="#a">a</a></code> element being dragged, then the value of the element's <code title="dom-a-href"><a href= "#href3">href</a></code> DOM attribute must be added, associated with the <code title="">text/uri-list</code> format. Otherwise, no data is added to the object by the user agent. If the event is canceled, then the drag-and-drop operation must not occur; the user agent must not continue with this algorithm. If it is not canceled, then the drag-and-drop operation must be initiated. Since events with no event handlers registered are, almost by definition, never canceled, drag-and-drop is always available to the user if the author does not specifically prevent it. The drag-and-drop feedback must be generated from the first of the following sources that is available: <ol> <li>The element specified in the last call to the <code title= "dom-DataTransfer-setDragImage"><a href= "#setdragimage">setDragImage()</a></code> method of the <code title="dom-DragEvent-dataTransfer"><a href= "#datatransfer">dataTransfer</a></code> object of the <code title= "event-dragstart"><a href="#dragstart">dragstart</a></code> event, if the method was called. In visual media, if this is used, the <var title="">x</var> and <var title="">y</var> arguments that were passed to that method should be used as hints for where to put the cursor relative to the resulting image. The values are expressed as distances in CSS pixels from the left side and from the top side of the image respectively. <a href="#references">[CSS21]</a></li> <li>The elements that were added to the <code title= "dom-DragEvent-dataTransfer"><a href= "#datatransfer">dataTransfer</a></code> object, both before the event was fired, and during the handling of the event using the <code title="dom-DataTransfer-addElement"><a href= "#addelement">addElement()</a></code> method, if any such elements were indeed added.</li> <li>The selection that the user is dragging.</li> </ol> The user agent must take a note of <a href="#setdata" title= "dom-DataTransfer-setData">the data that was placed</a> in the <code title="dom-DragEvent-dataTransfer"><a href= "#datatransfer">dataTransfer</a></code> object. This data will be made available again when the <code title="event-drop"><a href= "#drop">drop</a></code> event is fired. From this point until the end of the drag-and-drop operation, device input events (e.g. mouse and keyboard events) must be suppressed. In addition, the user agent must track all DOM changes made during the drag-and-drop operation, and add them to its <a href="#undo">undo history</a> as one atomic operation once the drag-and-drop operation has ended. During the drag operation, the element directly indicated by the user as the drop target is called the <dfn id="immediate">immediate user selection</dfn> . (Only elements can be selected by the user; other nodes must not be made available as drop targets.) However, the <a href="#immediate">immediate user selection</a> is not necessarily the <dfn id="current2">current target element</dfn> , which is the element currently selected for the drop part of the drag-and-drop operation. The <a href="#immediate">immediate user selection</a> changes as the user selects different elements (either by pointing at them with a pointing device, or by selecting them in some other way). The <a href="#current2">current target element</a> changes when the <a href="#immediate">immediate user selection</a> changes, based on the results of event handlers in the document, as described below. Both the <a href="#current2">current target element</a> and the <a href="#immediate">immediate user selection</a> can be null, which means no target element is selected. They can also both be elements in other (DOM-based) documents, or other (non-Web) programs altogether. (For example, a user could drag text to a word-processor.) The <a href="#current2">current target element</a> is initially null. In addition, there is also a <dfn id="current3">current drag operation</dfn> , which can take on the values "none", "copy", "link", and "move". Initially it has the value "none". It is updated by the user agent as described in the steps below. User agents must, every 350ms (±200ms), perform the following steps in sequence. (If the user agent is still performing the previous iteration of the sequence when the next iteration becomes due, the user agent must not execute the overdue iteration, effectively "skipping missed frames" of the drag-and-drop operation.) <ol> <li> First, the user agent must fire a <code title= "event-drag"><a href="#drag">drag</a></code> event at the <a href= "#source2">source node</a> . If this event is canceled, the user agent must set the <a href="#current3">current drag operation</a> to none (no drag operation). </li> <li> Next, if the <code title="event-drag"><a href= "#drag">drag</a></code> event was not canceled and the user has not ended the drag-and-drop operation, the user agent must check the state of the drag-and-drop operation, as follows: <ol> <li> First, if the user is indicating a different <a href= "#immediate">immediate user selection</a> than during the last iteration (or if this is the first iteration), and if this <a href= "#immediate">immediate user selection</a> is not the same as the <a href="#current2">current target element</a> , then the <a href= "#current2">current target element</a> must be updated, as follows: <ol> <li> If the new <a href="#immediate">immediate user selection</a> is null, or is in a non-DOM document or application, then set the <a href="#current2">current target element</a> to the same value. </li> <li> Otherwise, the user agent must fire a <code title= "event-dragenter"><a href="#dragenter">dragenter</a></code> event at the <a href="#immediate">immediate user selection</a> . </li> <li> If the event is canceled, then the <a href="#current2">current target element</a> must be set to the <a href= "#immediate">immediate user selection</a> . </li> <li> Otherwise, if the <a href="#current2">current target element</a> is not <a href="#the-body1">the body element</a> , the user agent must fire a <code title="event-dragenter"><a href= "#dragenter">dragenter</a></code> event at <a href="#the-body1">the body element</a> , and the <a href="#current2">current target element</a> must be set to <a href="#the-body1">the body element</a> , regardless of whether that event was canceled or not. (If <a href="#the-body1">the body element</a> is null, then the <a href="#current2">current target element</a> would be set to null too in this case, it wouldn't be set to the <code>Document</code> object.) </li> </ol> </li> <li> If the previous step caused the <a href="#current2">current target element</a> to change, and if the previous target element was not null or a part of a non-DOM document, the user agent must fire a <code title="event-dragleave"><a href= "#dragleave">dragleave</a></code> event at the previous target element. </li> <li> If the <a href="#current2">current target element</a> is a DOM element, the user agent must fire a <code title= "event-dragover"><a href="#dragover">dragover</a></code> event at this <a href="#current2">current target element</a> . If the <code title="event-dragover"><a href= "#dragover">dragover</a></code> event is <ins class= "diff-new">not</ins> canceled, the <a href="#current3">current drag operation</a> must be reset to "none". Otherwise, the <a href="#current3">current drag operation</a> must be set based on the values the <code title= "dom-DataTransfer-effectAllowed"><a href= "#effectallowed">effectAllowed</a></code> and <code title= "dom-DataTransfer-dropEffect"><a href= "#dropeffect">dropEffect</a></code> attributes of the <code title= "dom-DragEvent-dataTransfer"><a href= "#datatransfer">dataTransfer</a></code> object had after the event was handled, as per the following table: <table> <thead> <tr> <th><code title="dom-DataTransfer-effectAllowed"><a href= "#effectallowed">effectAllowed</a></code></th> <th><code title="dom-DataTransfer-dropEffect"><a href= "#dropeffect">dropEffect</a></code></th> <th>Drag operation</th> </tr> </thead> <tbody> <tr> <td><code title="">uninitialized</code> , <code title= "">copy</code> , <code title="">copyLink</code> , <code title= "">copyMove</code> , or <code title="">all</code></td> <td><code title="">copy</code></td> <td>"copy"</td> </tr> <tr> <td><code title="">uninitialized</code> , <code title= "">link</code> , <code title="">copyLink</code> , <code title= "">linkMove</code> , or <code title="">all</code></td> <td><code title="">link</code></td> <td>"link"</td> </tr> <tr> <td><code title="">uninitialized</code> , <code title= "">move</code> , <code title="">copyMove</code> , <code title= "">linkMove</code> , or <code title="">all</code></td> <td><code title="">move</code></td> <td>"move"</td> </tr> <tr> <td colspan="2">Any other case</td> <td>"none"</td> </tr> </tbody> </table> Then, regardless of whether the <code title= "event-dragover"><a href="#dragover">dragover</a></code> event was canceled or not, the drag feedback (e.g. the mouse cursor) must be updated to match the <a href="#current3">current drag operation</a> , as follows: <table> <thead> <tr> <th>Drag operation</th> <th>Feedback</th> </tr> </thead> <tbody> <tr> <td>"copy"</td> <td>Data will be copied if dropped here.</td> </tr> <tr> <td>"link"</td> <td>Data will be linked if dropped here.</td> </tr> <tr> <td>"move"</td> <td>Data will be moved if dropped here.</td> </tr> <tr> <td>"none"</td> <td>No operation allowed, dropping here will cancel the drag-and-drop operation.</td> </tr> </tbody> </table> </li> <li> Otherwise, if the <a href="#current2">current target element</a> is not a DOM element, the user agent must use platform-specific mechanisms to determine what drag operation is being performed (none, copy, link, or move). This sets the <a href= "#current3">current drag operation</a> . </li> </ol> </li> <li> Otherwise, if the user ended the drag-and-drop operation (e.g. by releasing the mouse button in a mouse-driven drag-and-drop interface), or if the <code title="event-drag"><a href= "#drag">drag</a></code> event was canceled, then this will be the last iteration. The user agent must execute the following steps, then stop looping. <ol> <li> If the <a href="#current3">current drag operation</a> is none (no drag operation), or, if the user ended the drag-and-drop operation by canceling it (e.g. by hitting the <kbd>Escape</kbd> key), or if the <a href="#current2">current target element</a> is null, then the drag operation failed. If the <a href= "#current2">current target element</a> is a DOM element, the user agent must fire a <code title="event-dragleave"><a href= "#dragleave">dragleave</a></code> event at it; otherwise, if it is not null, it must use platform-specific conventions for drag cancellation. </li> <li> Otherwise, the drag operation was as success. If the <a href= "#current2">current target element</a> is a DOM element, the user agent must fire a <code title="event-drop"><a href= "#drop">drop</a></code> event at it; otherwise, it must use platform-specific conventions for indicating a drop. When the target is a DOM element, the <code title= "dom-DataTransfer-dropEffect"><a href= "#dropeffect">dropEffect</a></code> attribute of the event's <code title="dom-DragEvent-dataTransfer"><a href= "#datatransfer">dataTransfer</a></code> object must be given the value representing the <a href="#current3">current drag operation</a> ( <code title="">copy</code> , <code title= "">link</code> , or <code title="">move</code> ), and the object must be set up so that the <code title= "dom-DataTransfer-getData"><a href="#getdata">getData()</a></code> method will return the data that was added during the <code title= "event-dragstart"><a href="#dragstart">dragstart</a></code> event. If the event is canceled, the <a href="#current3">current drag operation</a> must be set to the value of the <code title= "dom-DataTransfer-dropEffect"><a href= "#dropeffect">dropEffect</a></code> attribute of the event's <code title="dom-DragEvent-dataTransfer"><a href= "#datatransfer">dataTransfer</a></code> object as it stood after the event was handled. Otherwise, the event is not canceled, and the user agent must perform the event's default action, which depends on the exact target as follows: <dl class="switch"> <dt>If the <a href="#current2">current target element</a> is a text field (e.g. <code>textarea</code> , or an <code>input</code> element with <code title="">type="text"</code> )</dt> <dd>The user agent must insert the data associated with the <code>text/plain</code> format, if any, into the text field in a manner consistent with platform-specific conventions (e.g. inserting it at the current mouse cursor position, or inserting it at the end of the field).</dd> <dt>Otherwise</dt> <dd>Reset the <a href="#current3">current drag operation</a> to "none".</dd> </dl> </li> <li> Finally, the user agent must fire a <code title= "event-dragend"><a href="#dragend">dragend</a></code> event at the <a href="#source2">source node</a> , with the <code title= "dom-DataTransfer-dropEffect"><a href= "#dropeffect">dropEffect</a></code> attribute of the event's <code title="dom-DragEvent-dataTransfer"><a href= "#datatransfer">dataTransfer</a></code> object being set to the value corresponding to the <a href="#current3">current drag operation</a> . The <a href="#current3">current drag operation</a> can change during the processing of the <code title= "event-drop"><a href="#drop">drop</a></code> event, if one was fired. The event is not cancelable. After the event has been handled, the user agent must act as follows: <dl class="switch"> <dt>If the <a href="#current2">current target element</a> is a text field (e.g. <code>textarea</code> , or an <code>input</code> element with <code title="">type="text"</code> ), and a <code title="event-drop"><a href="#drop">drop</a></code> event was fired in the previous step, and the <a href="#current3">current drag operation</a> is "move", and the source of the drag-and-drop operation is a selection in the DOM</dt> <dd>The user agent should delete the range representing the dragged selection from the DOM.</dd> <dt>If the <a href="#current2">current target element</a> is a text field (e.g. <code>textarea</code> , or an <code>input</code> element with <code title="">type="text"</code> ), and a <code title="event-drop"><a href="#drop">drop</a></code> event was fired in the previous step, and the <a href="#current3">current drag operation</a> is "move", and the source of the drag-and-drop operation is a selection in a text field</dt> <dd>The user agent should delete the dragged selection from the relevant text field.</dd> <dt>Otherwise</dt> <dd>The event has no default action.</dd> </dl> </li> </ol> </li> </ol> <h5 id="when-the"><del class= "diff-old">5.3.3.1.</del> <ins class= "diff-chg">5.3.4.1.</ins> When the drag-and-drop operation starts or ends in another document</h5> The model described above is independent of which <code>Document</code> object the nodes involved are from; the events must be fired as described above and the rest of the processing model must be followed as described above, irrespective of how many documents are involved in the operation. <h5 id="when-the0"><del class= "diff-old">5.3.3.2.</del> <ins class= "diff-chg">5.3.4.2.</ins> When the drag-and-drop operation starts or ends in another application</h5> If the drag is initiated in another application, the <a href= "#source2">source node</a> is not a DOM node, and the user agent must use platform-specific conventions instead when the requirements above involve the source node. User agents in this situation must act as if the dragged data had been added to the <code><a href="#datatransfer0">DataTransfer</a></code> object when the drag started, even though no <code title= "event-dragstart"><a href="#dragstart">dragstart</a></code> event was actually fired; user agents must similarly use platform-specific conventions when deciding on what drag feedback to use. If a drag is started in a document but ends in another application, then the user agent must instead replace the parts of the processing model relating to handling the target according to platform-specific conventions. In any case, scripts running in the context of the document must not be able to distinguish the case of a drag-and-drop operation being started or ended in another application from the case of a drag-and-drop operation being started or ended in another document from another domain. <h4 id="the-draggable"><del class= "diff-old">5.3.4.</del> <ins class="diff-chg">5.3.5</ins> The <dfn id="draggable" title= "attr-draggable"><code>draggable</code></dfn> attribute</h4> All elements may have the <code title="attr-draggable"><a href= "#draggable">draggable</a></code> content attribute set. The <code title="attr-draggable"><a href= "#draggable">draggable</a></code> attribute is an <a href= "#enumerated">enumerated attribute</a> . It has three states. The first state is true and it has the keyword <code title= "">true</code> . The second state is false and it has the keyword <code title="">false</code> . The third state is auto ; it has no keywords but it is the missing value default . The <dfn id="draggable0" title= "dom-draggable"><code>draggable</code></dfn> DOM attribute, whose value depends on the content attribute's in the way described below, controls whether or not the element is draggable. Generally, only text selections are draggable, but elements whose <code title= "dom-draggable"><a href="#draggable0">draggable</a></code> DOM attribute is true become draggable as well. If an element's <code title="attr-draggable"><a href= "#draggable">draggable</a></code> content attribute has the state true , the <code title="dom-draggable"><a href= "#draggable0">draggable</a></code> DOM attribute must return true. Otherwise, if the element's <code title= "attr-draggable"><a href="#draggable">draggable</a></code> content attribute has the state false , the <code title= "dom-draggable"><a href="#draggable0">draggable</a></code> DOM attribute must return false. Otherwise, the element's <code title="attr-draggable"><a href= "#draggable">draggable</a></code> content attribute has the state auto . If the element is an <code><a href= "#img">img</a></code> element, or, if the element is an <code><a href="#a">a</a></code> element with an <code title= "attr-hyperlink-href"><a href="#href6">href</a></code> content attribute, the <code title="dom-draggable"><a href= "#draggable0">draggable</a></code> DOM attribute must return true. Otherwise, the <code title="dom-draggable"><a href= "#draggable0">draggable</a></code> DOM must return false. If the <code title="dom-draggable"><a href= "#draggable0">draggable</a></code> DOM attribute is set to the value false, the <code title="attr-draggable"><a href= "#draggable">draggable</a></code> content attribute must be set to the literal value <code title="">false</code> . If the <code title= "dom-draggable"><a href="#draggable0">draggable</a></code> DOM attribute is set to the value true, the <code title= "attr-draggable"><a href="#draggable">draggable</a></code> content attribute must be set to the literal value <code title= "">true</code> . <h4 id="copy-and"><del class= "diff-old">5.3.5.</del> <ins class="diff-chg">5.3.6</ins> Copy and paste</h4> Copy-and-paste is a form of drag-and-drop: the "copy" part is equivalent to dragging content to another application (the "clipboard"), and the "paste" part is equivalent to dragging content from another application. Select-and-paste (a model used by mouse operations in the X Window System) is equivalent to a drag-and-drop operation where the source is the selection. <h5 id="copy-to"><del class= "diff-old">5.3.5.1.</del> <ins class= "diff-chg">5.3.6.1.</ins> Copy to clipboard</h5> When the user invokes a copy operation, the user agent must act as if the user had invoked a drag on the current selection. If the drag-and-drop operation initiates, then the user agent must act as if the user had indicated (as the <a href="#immediate">immediate user selection</a> ) a hypothetical application representing the <del class="diff-old">clipbroad.</del> <ins class= "diff-chg">clipboard.</ins> Then, the user agent must act as if the user had ended the drag-and-drop operation without canceling it. If the drag-and-drop operation didn't get canceled, the user agent should then follow the relevant platform-specific conventions for copy operations (e.g. updating the clipboard). <h5 id="cut-to"><del class= "diff-old">5.3.5.2.</del> <ins class= "diff-chg">5.3.6.2.</ins> Cut to clipboard</h5> When the user invokes a cut operation, the user agent must act as if the user had invoked a copy operation (see the previous section), followed, if the copy was completed successfully, by <a href="#contenteditable-delete">a selection delete operation</a> . <h5 id="paste"><del class= "diff-old">5.3.5.3.</del> <ins class= "diff-chg">5.3.6.3.</ins> Paste from clipboard</h5> When the user invokes a clipboard paste operation, the user agent must act as if the user had invoked a drag on a hypothetical application representing the clipboard, setting the data associated with the drag as the <del class="diff-old">text from the keyboard (either as text/plain or text/uri-list ). If the contents of</del> <ins class="diff-chg">content on</ins> the clipboard <del class= "diff-old">cannot be represented as text or URIs, then the paste operation must not have any effect.</del> <ins class="diff-chg">(in whatever formats are available).</ins> Then, the user agent must act as if the user had indicated (as the <a href="#immediate">immediate user selection</a> ) the element with the keyboard focus, and then ended the drag-and-drop operation without canceling it. <h5 id="paste0"><del class= "diff-old">5.3.5.4.</del> <ins class= "diff-chg">5.3.6.4.</ins> Paste from selection</h5> When the user invokes a selection paste operation, the user agent must act as if the user had invoked a drag on the current selection, then indicated (as the <a href="#immediate">immediate user selection</a> ) the element with the keyboard focus, and then ended the drag-and-drop operation without canceling it. <del class= "diff-old">If the contents of the selection cannot be represented as text or URIs, then the paste operation must not have any effect.</del> <h4 id="security8"><del class= "diff-old">5.3.6.</del> <ins class="diff-chg">5.3.7</ins> Security risks in the drag-and-drop model</h4> User agents must not make the data added to the <code><a href= "#datatransfer0">DataTransfer</a></code> object during the <code title="event-dragstart"><a href= "#dragstart">dragstart</a></code> event available to scripts until the <code title="event-drop"><a href="#drop">drop</a></code> event, because otherwise, if a user were to drag sensitive information from one document to a second document, crossing a hostile third document in the process, the hostile document could intercept the data. For the same reason, user agents must <del class= "diff-old">only</del> consider a drop to be successful <ins class= "diff-new">only</ins> if the user specifically ended the drag operation — if any scripts end the drag operation, it must be considered unsuccessful (canceled) and the <code title= "event-drop"><a href="#drop">drop</a></code> event must not be fired. User agents should take care to not start drag-and-drop operations in response to script actions. For example, in a mouse-and-window environment, if a script moves a window while the user has his mouse button depressed, the UA would not consider that to start a drag. This is important because otherwise UAs could cause data to be dragged from sensitive sources and dropped into hostile documents without the user's consent. <h3 id="undo"><del class="diff-old">5.4.</del> <ins class="diff-chg">5.4</ins> <dfn id="undo-history">Undo history</dfn></h3> There has got to be a better way of doing this, surely. The user agent must associate an <dfn id="undo-transaction">undo transaction history</dfn> with each <code><a href= "#htmldocument">HTMLDocument</a></code> object. The <a href="#undo-transaction">undo transaction history</a> is a list of entries. The entries are of two type: <a href= "#dom-changes">DOM changes</a> and <a href="#undo-object" title= "undo object">undo objects</a> . Each <dfn id="dom-changes">DOM changes</dfn> entry in the <a href="#undo-transaction">undo transaction history</a> consists of batches of one or more of the following: <ul> <li>Changes to the <a href="#content">content attributes</a> of an <code>Element</code> node.</li> <li>Changes to the <a href="#dom-attributes">DOM attributes</a> of a <code>Node</code> .</li> <li>Changes to the DOM hierarchy of nodes that are descendants of the <code><a href="#htmldocument">HTMLDocument</a></code> object ( <code>parentNode</code> , <code>childNodes</code> ).</li> </ul> <dfn id="undo-object">Undo object</dfn> entries consist of objects representing state that scripts running in the document are managing. For example, a Web mail application could use an <a href= "#undo-object">undo object</a> to keep track of the fact that a user has moved an e-mail to a particular folder, so that the user can undo the action and have the e-mail return to its former location. Broadly speaking, <a href="#dom-changes">DOM changes</a> entries are handled by the UA in response to user edits of form controls and editing hosts on the page, and <a href= "#undo-object">undo object</a> entries are handled by script in response to higher-level user actions (such as interactions with server-side state, or in the implementation of a drawing tool). <h4 id="the-undomanager"><del class= "diff-old">5.4.1.</del> <ins class="diff-chg">5.4.1</ins> The <code><a href="#undomanager">UndoManager</a></code> interface</h4> <div class="big-issue"> This API sucks. Seriously. It's a terrible API. Really bad. I hate it. Here are the requirements: <ul> <li>Has to cope with cases where the server has undo state already when the page is loaded, that can be stuffed into the undo buffer onload.</li> <li>Has to support undo/redo.</li> <li>Has to cope with the "undo" action being "contact the server and tell it to undo", rather than it being the opposite of the "redo" action.</li> <li>Has to cope with some undo states expiring from the undo history (e.g. server can only remember one undelete action) but other states not expiring (e.g. client can undo arbitrary amounts of local edits).</li> </ul> </div> To manage <a href="#undo-object">undo object</a> entries in the <a href="#undo-transaction">undo transaction history</a> , the <code><a href="#undomanager">UndoManager</a></code> interface can be used: <pre class="idl"> interface <dfn id="undomanager">UndoManager</dfn> { <del class= "diff-old"> unsigned long (in DOMObject data, in DOMStrong title); void (in unsigned long index); </del> <ins class="diff-chg"> unsigned long <a href="#adddata" title= "dom-UndoManager-add">add</a>(in DOMObject data, in DOMString title); [XXX] void <a href="#remove2" title= "dom-UndoManager-remove">remove</a>(in unsigned long index); </ins> void <a href="#clearundo" title= "dom-UndoManager-clearUndo">clearUndo</a>(); void <a href="#clearredo" title= "dom-UndoManager-clearRedo">clearRedo</a>(); <del class="diff-old"> DOMObject (in unsigned long index); readonly attribute unsigned long ; </del> <ins class="diff-chg"> [IndexGetter] DOMObject <a href="#itemn" title="dom-UndoManager-item">item</a>(in unsigned long index); readonly attribute unsigned long <a href="#length11" title= "dom-UndoManager-length">length</a>; </ins> readonly attribute unsigned long <a href="#position0" title= "dom-UndoManager-position">position</a>; }; </pre> The <dfn id="undomanager0" title= "dom-undoManager"><code>undoManager</code></dfn> attribute of the <code><a href="#window">Window</a></code> interface must return the object implementing the <code><a href= "#undomanager">UndoManager</a></code> interface for that <code><a href="#window">Window</a></code> object's associated <code><a href="#htmldocument">HTMLDocument</a></code> object. <del class="diff-old">In the ECMAScript DOM binding, objects implementing this interface must also support being dereferenced using the square bracket notation, such that dereferencing with an integer index is equivalent to invoking the item() method with that index (e.g. undoManager[1] returns the same as undoManager.item(1) ).</del> <code><a href="#undomanager">UndoManager</a></code> objects represent their document's <a href="#undo-transaction">undo transaction history</a> . Only <a href="#undo-object">undo object</a> entries are visible with this API, but this does not mean that <a href="#dom-changes">DOM changes</a> entries are absent from the <a href="#undo-transaction">undo transaction history</a> . The <dfn id="length11" title= "dom-UndoManager-length"><code>length</code></dfn> attribute must return the number of <a href="#undo-object">undo object</a> entries in the <a href="#undo-transaction">undo transaction history</a> . The <dfn id="itemn" title="dom-UndoManager-item"><code>item( <var title="">n</var> )</code></dfn> method must return the <var title="">n</var> th <a href="#undo-object">undo object</a> entry in the <a href="#undo-transaction">undo transaction history</a> . The <a href="#undo-transaction">undo transaction history</a> has a <dfn id="current4" title="undo position">current position</dfn> . This is the position between two entries in the <a href= "#undo-transaction">undo transaction history</a> 's list where the previous entry represents what needs to happen if the user invokes the "undo" command (the "undo" side, lower numbers), and the next entry represents what needs to happen if the user invokes the "redo" command (the "redo" side, higher numbers). The <dfn id="position0" title= "dom-UndoManager-position"><code>position</code></dfn> attribute must return the index of the <a href="#undo-object">undo object</a> entry nearest to the <a href="#current4">undo position</a> , on the "redo" side. If there are no <a href="#undo-object">undo object</a> entries on the "redo" side, then the attribute must return the same as the <code title="dom-UndoManager-length"><a href= "#length11">length</a></code> attribute. If there are no <a href= "#undo-object">undo object</a> entries on the "undo" side of the <a href="#current4">undo position</a> , the <code title= "dom-UndoManager-position"><a href="#position0">position</a></code> attribute returns zero. Since the <a href="#undo-transaction">undo transaction history</a> contains both <a href="#undo-object">undo object</a> entries and <a href="#dom-changes">DOM changes</a> entries, but the <code title="dom-UndoManager-position"><a href= "#position0">position</a></code> attribute only returns indices relative to <a href="#undo-object">undo object</a> entries, it is possible for several "undo" or "redo" actions to be performed without the value of the <code title= "dom-UndoManager-position"><a href="#position0">position</a></code> attribute changing. The <dfn id="adddata" title="dom-UndoManager-add"><code>add( <var title="">data</var> , <var title="">title</var> )</code></dfn> method's <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> depends on the current state. Normally, it must insert the <var title="">data</var> object passed as an argument into the <a href="#undo-transaction">undo transaction history</a> immediately before the <a href="#current4">undo position</a> , optionally remembering the given <var title= "">title</var> to use in the UI. If the method is called <a href= "#undo-moving0" title="do-undo">during an undo operation</a> , however, the object must instead be added immediately after the <a href="#current4">undo position</a> . If the method is called and there is neither <a href= "#undo-moving0" title="do-undo">an undo operation in progress</a> nor <a href="#redo-moving0" title="do-redo">a redo operation in progress</a> then any entries in the <a href= "#undo-transaction">undo transaction history</a> after the <a href= "#current4">undo position</a> must be removed (as if <code title= "dom-UndoManager-clearRedo"><a href= "#clearredo">clearRedo()</a></code> had been called). We could fire events when someone adds something to the undo history -- one event per undo object entry before the position (or after, during redo addition), allowing the script to decide if that entry should remain or not. Or something. Would make it potentially easier to expire server-held state when the server limitations come into play. The <dfn id="remove2" title= "dom-UndoManager-remove"><code>remove( <var title="">index</var> )</code></dfn> method must remove the <a href="#undo-object">undo object</a> entry with the specified <var title="">index</var> . If the index is less than zero or greater than or equal to <code title="dom-UndoManager-length"><a href= "#length11">length</a></code> then the method must raise an <code>INDEX_SIZE_ERR</code> exception. <a href="#dom-changes">DOM changes</a> entries are unaffected by this method. The <dfn id="clearundo" title= "dom-UndoManager-clearUndo"><code>clearUndo()</code></dfn> method must remove all entries in the <a href="#undo-transaction">undo transaction history</a> before the <a href="#current4">undo position</a> , be they <a href="#dom-changes">DOM changes</a> entries or <a href="#undo-object">undo object</a> entries. The <dfn id="clearredo" title= "dom-UndoManager-clearRedo"><code>clearRedo()</code></dfn> method must remove all entries in the <a href="#undo-transaction">undo transaction history</a> after the <a href="#current4">undo position</a> , be they <a href="#dom-changes">DOM changes</a> entries or <a href="#undo-object">undo object</a> entries. Another idea is to have a way for scripts to say "startBatchingDOMChangesForUndo()" and after that the changes to the DOM go in as if the user had done them. <h4 id="undo-moving"><del class= "diff-old">5.4.2.</del> <ins class="diff-chg">5.4.2</ins> <dfn id="undo-moving0" title="do-undo">Undo: moving back in the undo transaction history</dfn></h4> When the user invokes an undo operation, or when the <code title="dom-document-execCommand"><a href= "#execCommand">execCommand()</a></code> method is called with the <code title="command-undo"><a href="#undo1">undo</a></code> command, the user agent must perform an undo operation. If the <a href="#current4">undo position</a> is at the start of the <a href="#undo-transaction">undo transaction history</a> , then the user agent must do nothing. If the entry immediately before the <a href="#current4">undo position</a> is a <a href="#dom-changes">DOM changes</a> entry, then the user agent must remove that <a href="#dom-changes">DOM changes</a> entry, reverse the DOM changes that were listed in that entry, and, if the changes were reversed with no problems, add a new <a href="#dom-changes">DOM changes</a> entry (consisting of the opposite of those DOM changes) to the <a href= "#undo-transaction">undo transaction history</a> on the other side of the <a href="#current4">undo position</a> . If the DOM changes cannot be undone (e.g. because the DOM state is no longer consistent with the changes represented in the entry), then the user agent must simply remove the <a href= "#dom-changes">DOM changes</a> entry, without doing anything else. If the entry immediately before the <a href="#current4">undo position</a> is an <a href="#undo-object">undo object</a> entry, then the user agent must first remove that <a href= "#undo-object">undo object</a> entry from the <a href= "#undo-transaction">undo transaction history</a> , and then must fire an <code title="event-undo"><a href="#undo0">undo</a></code> event on the <code>Document</code> object, using the <a href= "#undo-object">undo object</a> entry's associated undo object as the event's data. Any calls to <code title="dom-undoManager-add"><a href= "#adddata">add()</a></code> while the event is being handled will be used to populate the redo history, and will then be used if the user invokes the "redo" command to undo his undo. <h4 id="redo-moving"><del class= "diff-old">5.4.3.</del> <ins class="diff-chg">5.4.3</ins> <dfn id="redo-moving0" title="do-redo">Redo: moving forward in the undo transaction history</dfn></h4> When the user invokes a redo operation, or when the <code title= "dom-document-execCommand"><a href= "#execCommand">execCommand()</a></code> method is called with the <code title="command-redo"><a href="#redo0">redo</a></code> command, the user agent must perform a redo operation. This is mostly the opposite of an <a href="#undo-moving0" title= "do-undo">undo operation</a> , but the full definition is included here for completeness. If the <a href="#current4">undo position</a> is at the end of the <a href="#undo-transaction">undo transaction history</a> , then the user agent must do nothing. If the entry immediately after the <a href="#current4">undo position</a> is a <a href="#dom-changes">DOM changes</a> entry, then the user agent must remove that <a href="#dom-changes">DOM changes</a> entry, reverse the DOM changes that were listed in that entry, and, if the changes were reversed with no problems, add a new <a href="#dom-changes">DOM changes</a> entry (consisting of the opposite of those DOM changes) to the <a href= "#undo-transaction">undo transaction history</a> on the other side of the <a href="#current4">undo position</a> . If the DOM changes cannot be redone (e.g. because the DOM state is no longer consistent with the changes represented in the entry), then the user agent must simply remove the <a href= "#dom-changes">DOM changes</a> entry, without doing anything else. If the entry immediately after the <a href="#current4">undo position</a> is an <a href="#undo-object">undo object</a> entry, then the user agent must first remove that <a href= "#undo-object">undo object</a> entry from the <a href= "#undo-transaction">undo transaction history</a> , and then must fire a <code title="event-undo"><a href="#undo0">redo</a></code> event on the <code>Document</code> object, using the <a href= "#undo-object">undo object</a> entry's associated undo object as the event's data. <h4 id="the-undomanagerevent"><del class= "diff-old">5.4.4.</del> <ins class="diff-chg">5.4.4</ins> The <code><a href="#undomanagerevent">UndoManagerEvent</a></code> interface and the <code title="event-undo"><a href= "#undo0">undo</a></code> and <code title="event-redo"><a href= "#redo">redo</a></code> events</h4> <pre class="idl"> interface <dfn id= "undomanagerevent">UndoManagerEvent</dfn> : Event { readonly attribute DOMObject <a href="#data3" title= "dom-UndoManagerEvent-data">data</a>; void <a href="#initundomanagerevent" title= "dom-UndoManagerEvent-initUndoManagerEvent">initUndoManagerEvent</a>(in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMObject dataArg); void initUndoManagerEventNS(in DOMString namespaceURIArg, in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMObject dataArg); }; </pre> The <dfn id="initundomanagerevent" title= "dom-UndoManagerEvent-initUndoManagerEvent"><code>initUndoManagerEvent()</code></dfn> and <dfn id="initundomanagereventns"><code title= "dom-UndoManagerEvent-initUndoManagerEventNS">initUndoManagerEventNS()</code></dfn> methods must initialise the event in a manner analogous to the similarly-named methods in the DOM3 Events interfaces. <a href= "#references">[DOM3EVENTS]</a> The <dfn id="data3" title= "dom-UndoManagerEvent-data"><code>data</code></dfn> attribute represents the <a href="#undo-object">undo object</a> for the event. The <dfn id="undo0" title="event-undo"><code>undo</code></dfn> and <dfn id="redo" title="event-redo"><code>redo</code></dfn> events do not bubble, cannot be canceled, and have no default action. When the user agent fires one of these events it must use the <code><a href="#undomanagerevent">UndoManagerEvent</a></code> interface, with the <code title= "dom-UndoManagerEvent-data"><a href="#data3">data</a></code> field containing the relevant <a href="#undo-object">undo object</a> . <h4 id="implementation0"><del class= "diff-old">5.4.5.</del> <ins class="diff-chg">5.4.5</ins> Implementation notes</h4> How user agents present the above conceptual model to the user is not defined. The undo interface could be a filtered view of the <a href="#undo-transaction">undo transaction history</a> , it could manipulate the <a href="#undo-transaction">undo transaction history</a> in ways not described above, and so forth. For example, it is possible to design a UA that appears to have separate <a href="#undo-transaction" title="undo transaction history">undo transaction histories</a> for each form control; similarly, it is possible to design systems where the user has access to more undo information than is present in the <del class= "diff-old">offical</del> <ins class="diff-chg">official</ins> (as described above) <a href="#undo-transaction">undo transaction history</a> (such as providing a tree-based approach to document state). Such UI models should be based upon the single <a href= "#undo-transaction">undo transaction history</a> described in this section, however, such that to a script there is no detectable difference. <del class="diff-old">5.5. Command APIs The execCommand( commandId , doShowUI , value ) method on the HTMLDocument interface allows scripts to perform actions on the current selection or at the current caret position. Generally, these commands would be used to implement editor UI, for example having a "delete" button on a toolbar. There are three variants to this method, with one, two, and three arguments respectively. The doShowUI and value parameters, even if specified, are ignored unless otherwise stated. In this specification, in fact, the doShowUI parameter is always ignored, regardless of its value. It is included for historical reasons only. When any of these methods are invoked, user agents must act as described in the list below. For actions marked " editing hosts only ", if the selection is not entirely within an editing host , of if there is no selection and the caret is not inside an editing host , then the user agent must do nothing. If the commandId is undo The user agent must move back one step in its undo transaction history , restoring the associated state. If there is no further undo information the user agent must do nothing. See the undo history . If the commandId is redo The user agent must move forward one step in its undo transaction history , restoring the associated state. If there is no further undo (well, "redo") information the user agent must do nothing. See the undo history . If the commandId is selectAll The user agent must change the selection so that all the content in the currently focused editing host is selected. If no editing host is focused, then the content of the entire document must be selected. If the commandId is unselect The user agent must change the selection so that nothing is selected. We need some sort of way in which the user can make a selection without risk of script clobbering it. If the commandId is superscript Editing hosts only. The user agent must act as if the user had requested that the selection be wrapped in the semantics of the sup element (or unwrapped, or, if there is no selection, have that semantic inserted or removed — the exact behaviour is UA-defined). If the commandId is subscript Editing hosts only. The user agent must act as if the user had requested that the selection be wrapped in the semantics of the sub element (or, again, unwrapped, or have that semantic inserted or removed, as defined by the UA). If the commandId is formatBlock Editing hosts only. This command changes the semantics of the blocks containing the selection. If there is no selection, then, where in the description below refers to the selection, the user agent must act as if the selection was an empty range at the caret position. If the value parameter is not specified or has a value other than one of the following literal strings: <address> <aside> <h1> <h2> <h3> <h4> <h5> <h6> <nav> <p> <pre> ...then the user agent must do nothing. Otherwise, the user agent must, for every position in the selection, take the furthest prose content ancestor element of that position that contains only phrasing content , and, if that element is a descendant of the editing host, rename it (as if the Element.renameNode() method had been used) according to the value , by stripping the leading < character and the trailing > character and using the rest as the new tag name, using the HTML namespace. If the commandId is delete Editing hosts only. The user agent must act as if the user had performed a backspace operation . If the commandId is forwardDelete Editing hosts only. The user agent must act as if the user had performed a forward delete operation . If the commandId is insertLineBreak Editing hosts only. The user agent must act as if the user had requested a line separator . If the commandId is insertParagraph Editing hosts only. The user agent must act as if the user had performed a break block editing action. If the commandId is insertText Editing hosts only. The user agent must act as if the user had inserted text corresponding to the value parameter. If the commandId is vendorID - customCommandID User agents may implement vendor-specific extensions to this API. Vendor-specific extensions to the list of commands should use the syntax vendorID - customCommandID so as to prevent clashes between extensions from different vendors and future additions to this specification. If the commandId is something else User agents must do nothing.</del> <h3 id="selection"><del class= "diff-old">5.6.</del> <ins class="diff-chg">5.5</ins> The text selection APIs</h3> Every <a href="#browsing1">browsing context</a> has <dfn id= "a-selection" title="the selection">a selection</dfn> . The selection can be empty, and the selection can have more than one range (a disjointed selection). The user should be able to change the selection. User agents are not required to let the user select more than one range, and may collapse multiple ranges in the selection to a single range when the user interacts with the selection. (But, of course, the user agent may let the user create selections with multiple ranges.) This one selection must be shared by all the content of the browsing context (though not by nested <a href="#browsing1" title= "browsing context">browsing contexts</a> ), including any editing hosts in the document. (Editing hosts that are not inside a document cannot have a selection.) If the selection is empty (collapsed, so that it has only one segment and that segment's start and end points are the same) then the selection's position should equal the caret position. When the selection is not empty, this specification does not define the caret position; user agents should follow platform conventions in deciding whether the caret is at the start of the selection, the end of the selection, or somewhere else. On some platforms (such as those using Wordstar editing conventions), the caret position is totally independent of the start and end of the selection, even when the selection is empty. On such platforms, user agents may ignore the requirement that the cursor position be linked to the position of the selection altogether. Mostly for historical reasons, in addition to the <a href= "#browsing1">browsing context</a> 's <a href="#a-selection" title= "the selection">selection</a> , each <code>textarea</code> and <code>input</code> element has an independent selection. These are the <dfn id="text-field" title="text field selection">text field selections</dfn> . <ins class="diff-new">User agents may selectively ignore attempts to use the API to adjust the selection made after the user has modified the selection. For example, if the user has just selected part of a word, the user agent could ignore attempts to use the API call to immediately unselect the selection altogether, but could allow attempts to change the selection to select the entire word.</ins> <ins class="diff-new">User agents may also allow the user to create selections that are not exposed to the API.</ins> The <code><a href="#datagrid0">datagrid</a></code> and <code>select</code> elements also have selections, indicating which items have been picked by the user. These are not discussed in this section. This specification does not specify how selections are presented to the user. The Selectors specification, in conjunction with CSS, can be used to style text selections using the <code><a href="#selection1">::selection</a></code> pseudo-element. <a href="#references">[SELECTORS]</a> <a href= "#references">[CSS21]</a> <h4 id="documentSelection"><del class= "diff-old">5.6.1.</del> <ins class="diff-chg">5.5.1</ins> APIs for the browsing context selection</h4> The <dfn id="getselection" title= "dom-getSelection"><code>getSelection()</code></dfn> method on the <code><a href="#window">Window</a></code> interface must return the <code><a href="#selection1">Selection</a></code> object representing <a href="#a-selection">the selection</a> of that <code><a href="#window">Window</a></code> object's <a href= "#browsing1">browsing context</a> . For historical reasons, the <dfn id="getselection0" title= "dom-document-getSelection"><code>getSelection()</code></dfn> method on the <code><a href="#htmldocument">HTMLDocument</a></code> interface must return the same <code><a href= "#selection1">Selection</a></code> object. <del class= "diff-old">{</del> <pre> <ins class="diff-chg"> class=idl>[<a href="#stringify0" title= "dom-selection-toString">Stringifies</a>] interface <dfn id= "selection1">Selection</dfn> { </ins> readonly attribute Node <a href="#anchornode" title= "dom-selection-anchorNode">anchorNode</a>; readonly attribute long <a href="#anchoroffset" title= "dom-selection-anchorOffset">anchorOffset</a>; readonly attribute Node <a href="#focusnode" title= "dom-selection-focusNode">focusNode</a>; readonly attribute long <a href="#focusoffset" title= "dom-selection-focusOffset">focusOffset</a>; readonly attribute boolean <a href="#iscollapsed" title= "dom-selection-isCollapsed">isCollapsed</a>; void <a href="#collapse" title= "dom-selection-collapse">collapse</a>(in Node parentNode, in long offset); void <a href="#collapsetostart" title= "dom-selection-collapseToStart">collapseToStart</a>(); void <a href="#collapsetoend" title= "dom-selection-collapseToEnd">collapseToEnd</a>(); void <a href="#selectallchildren" title= "dom-selection-selectAllChildren">selectAllChildren</a>(in Node parentNode); void <a href="#deletefromdocument" title= "dom-selection-deleteFromDocument">deleteFromDocument</a>(); readonly attribute long <a href="#rangecount" title= "dom-selection-rangeCount">rangeCount</a>; Range <a href="#getrangeat" title= "dom-selection-getRangeAt">getRangeAt</a>(in long index); void <a href="#addrange" title= "dom-selection-addRange">addRange</a>(in Range range); void <a href="#removerange" title= "dom-selection-removeRange">removeRange</a>(in Range range); void <a href="#removeallranges" title= "dom-selection-removeAllRanges">removeAllRanges</a>(); <del class="diff-old"> DOMString (); </del> }; </pre> The <code><a href="#selection1">Selection</a></code> interface is represents a list of <code>Range</code> objects. The first item in the list has index 0, and the last item has index <var title= "">count</var> -1, where <var title="">count</var> is the number of ranges in the list. <a href="#references">[DOM2RANGE]</a> All of the members of the <code><a href= "#selection1">Selection</a></code> interface are defined in terms of operations on the <code>Range</code> objects represented by this object. These operations can raise exceptions, as defined for the <code>Range</code> interface; this can therefore result in the members of the <code><a href="#selection1">Selection</a></code> interface raising exceptions as well, in addition to any explicitly called out below. The <dfn id="anchornode" title= "dom-selection-anchorNode"><code>anchorNode</code></dfn> attribute must return the value returned by the <code title= "">startContainer</code> attribute of the last <code>Range</code> object in the list, or null if the list is empty. The <dfn id="anchoroffset" title= "dom-selection-anchorOffset"><code>anchorOffset</code></dfn> attribute must return the value returned by the <code title= "">startOffset</code> attribute of the last <code>Range</code> object in the list, or 0 if the list is empty. The <dfn id="focusnode" title= "dom-selection-focusNode"><code>focusNode</code></dfn> attribute must return the value returned by the <code title= "">endContainer</code> attribute of the last <code>Range</code> object in the list, or null if the list is empty. The <dfn id="focusoffset" title= "dom-selection-focusOffset"><code>focusOffset</code></dfn> attribute must return the value returned by the <code title= "">endOffset</code> attribute of the last <code>Range</code> object in the list, or 0 if the list is empty. The <dfn id="iscollapsed" title= "dom-selection-isCollapsed"><code>isCollapsed</code></dfn> attribute must return true if there are zero ranges, or if there is exactly one range and its <code title="">collapsed</code> attribute is itself true. Otherwise it must return false. The <dfn id="collapse" title= "dom-selection-collapse"><code>collapse( <var title= "">parentNode</var> , <var title="">offset</var> )</code></dfn> method must raise a <code>WRONG_DOCUMENT_ERR</code> DOM exception if <var title="">parentNode</var> 's <code title= "">ownerDocument</code> is not the <code><a href= "#htmldocument">HTMLDocument</a></code> object with which the <code><a href="#selection1">Selection</a></code> object is associated. Otherwise it is, and the method must remove all the ranges in the <code><a href="#selection1">Selection</a></code> list, then create a new <code>Range</code> object, add it to the list, and invoke its <code title="">setStart()</code> and <code title="">setEnd()</code> methods with the <var title= "">parentNode</var> and <var title="">offset</var> values as their arguments. The <dfn id="collapsetostart" title= "dom-selection-collapseToStart"><code>collapseToStart()</code></dfn> method must raise an <code>INVALID_STATE_ERR</code> DOM exception if there are no ranges in the list. Otherwise, it must invoke the <code title="dom-selection-collapse"><a href= "#collapse">collapse()</a></code> method with the <code title= "">startContainer</code> and <code title="">startOffset</code> values of the first <code>Range</code> object in the list as the arguments. The <dfn id="collapsetoend" title= "dom-selection-collapseToEnd"><code>collapseToEnd()</code></dfn> method must raise an <code>INVALID_STATE_ERR</code> DOM exception if there are no ranges in the list. Otherwise, it must invoke the <code title="dom-selection-collapse"><a href= "#collapse">collapse()</a></code> method with the <code title= "">endContainer</code> and <code title="">endOffset</code> values of the last <code>Range</code> object in the list as the arguments. The <dfn id="selectallchildren" title= "dom-selection-selectAllChildren"><code>selectAllChildren( <var title="">parentNode</var> )</code></dfn> method must invoke the <code title="dom-selection-collapse"><a href= "#collapse">collapse()</a></code> method with the <var title= "">parentNode</var> value as the first argument and 0 as the second argument, and must then invoke the <code title= "">selectNodeContents()</code> method on the first (and only) range in the list with the <var title="">parentNode</var> value as the argument. The <dfn id="deletefromdocument" title= "dom-selection-deleteFromDocument"><code>deleteFromDocument()</code></dfn> method must invoke the <code title="">deleteContents()</code> method on each range in the list, if any, from first to last. The <dfn id="rangecount" title= "dom-selection-rangeCount"><code>rangeCount</code></dfn> attribute must return the number of ranges in the list. The <dfn id="getrangeat" title= "dom-selection-getRangeAt"><code>getRangeAt( <var title= "">index</var> )</code></dfn> method must return the <var title= "">index</var> th range in the list. If <var title="">index</var> is less than zero or greater or equal to the value returned by the <code title="dom-selection-rangeCount"><a href= "#rangecount">rangeCount</a></code> attribute, then the method must raise an <code>INDEX_SIZE_ERR</code> DOM exception. The <dfn id="addrange" title= "dom-selection-addRange"><code>addRange( <var title="">range</var> )</code></dfn> method must add the given <var title="">range</var> Range object to the list of selections, at the end (so the newly added range is the new last range). Duplicates are not prevented; a range may be added more than once in which case it appears in the list more than once, which (for example) will cause <del class= "diff-old">toString()</del> <a href="#stringify0" title= "dom-selection-toString"><ins class= "diff-chg">stringification</ins></a> to return the range's text twice. The <dfn id="removerange" title= "dom-selection-removeRange"><code>removeRange( <var title= "">range</var> )</code></dfn> method must remove the first occurrence of <var title="">range</var> in the list of ranges, if it appears at all. The <dfn id="removeallranges" title= "dom-selection-removeAllRanges"><code>removeAllRanges()</code></dfn> method must remove all the ranges from the list of ranges, such that the <code title="dom-selection-rangeCount"><a href= "#rangecount">rangeCount</a></code> attribute returns 0 after the <code title="dom-selection-removeAllRanges"><a href= "#removeallranges">removeAllRanges()</a></code> method is invoked (and until a new range is added to the list, either through this interface or via user interaction). <del class="diff-old">The toString() method</del> <ins class= "diff-chg">Objects implementing this interface</ins> must <del class="diff-old">return</del> <dfn id="stringify0" title= "dom-selection-toString"><ins class= "diff-chg">stringify</ins></dfn> <ins class="diff-chg">to</ins> a concatenation of the results of invoking the <code title= "">toString()</code> method of the <code>Range</code> object on each of the ranges of the selection, in the order they appear in the list (first to last). <del class="diff-old">In language bindings where this is supported, objects implementing the Selection interface must stringify to the value returned by the object's toString() method.</del> <div class="example"> In the following document fragment, the emphasised parts indicate the selection. <pre> <p> The cute girl likes  the  <cite>  Oxford English  Dictionary</cite>. </pre> If a script invoked <code title= "">window.getSelection().toString()</code> , the return value would be " <code>the Oxford English</code> ". </div> The <code><a href= "#selection1">Selection</a></code> interface has no relation to the <code><a href="#datagridselection">DataGridSelection</a></code> interface. <h4 id="textFieldSelection"><del class= "diff-old">5.6.2.</del> <ins class="diff-chg">5.5.2</ins> APIs for the text field selections</h4> When we define HTMLTextAreaElement and HTMLInputElement we will have to add the IDL given below to both of their IDLs. The <code>input</code> and <code>textarea</code> elements define four members in their DOM interfaces for handling their text selection: <pre class="idl"> void <a href="#select1" title= "dom-textarea/input-select">select</a>(); attribute unsigned long <a href="#selectionstart" title= "dom-textarea/input-selectionStart">selectionStart</a>; attribute unsigned long <a href="#selectionend" title= "dom-textarea/input-selectionEnd">selectionEnd</a>; void <a href="#setselectionrange" title= "dom-textarea/input-setSelectionRange"> setSelectionRange </a> (in unsigned long start, in unsigned long end); </pre> These methods and attributes expose and control the selection of <code>input</code> and <code>textarea</code> text fields. The <dfn id="select1" title= "dom-textarea/input-select"><code>select()</code></dfn> method must cause the contents of the text field to be fully selected. The <dfn id="selectionstart" title= "dom-textarea/input-selectionStart"><code>selectionStart</code></dfn> attribute must, on getting, return the offset (in logical order) to the character that immediately follows the start of the selection. If there is no selection, then it must return the offset (in logical order) to the character that immediately follows the text entry cursor. On setting, it must act as if the <code title= "dom-textarea/input-setSelectionRange"><a href= "#setselectionrange">setSelectionRange()</a></code> method had been called, with the new value as the first argument, and the current value of the <code title="dom-textarea/input-selectionEnd"><a href= "#selectionend">selectionEnd</a></code> attribute as the second argument, unless the current value of the <code title= "dom-textarea/input-selectionEnd"><a href= "#selectionend">selectionEnd</a></code> is less than the new value, in which case the second argument must also be the new value. The <dfn id="selectionend" title= "dom-textarea/input-selectionEnd"><code>selectionEnd</code></dfn> attribute must, on getting, return the offset (in logical order) to the character that immediately follows the end of the selection. If there is no selection, then it must return the offset (in logical order) to the character that immediately follows the text entry cursor. On setting, it must act as if the <code title= "dom-textarea/input-setSelectionRange"><a href= "#setselectionrange">setSelectionRange()</a></code> method had been called, with the current value of the <code title= "dom-textarea/input-selectionStart"><a href= "#selectionstart">selectionStart</a></code> attribute as the first argument, and new value as the second argument. The <dfn id="setselectionrange" title= "dom-textarea/input-setSelectionRange"><code>setSelectionRange( <var title="">start</var> , <var title="">end</var> )</code></dfn> method must set the selection of the text field to the sequence of characters starting with the character at the <var title= "">start</var> th position (in logical order) and ending with the character at the ( <var title="">end</var> -1) th position. Arguments greater than the length of the value in the text field must be treated as pointing at the end of the text field. If <var title="">end</var> is less than or equal to <var title="">start</var> then the start of the selection and the end of the selection must both be placed immediately before the character with offset <var title="">end</var> . In UAs where there is no concept of an empty selection, this must set the cursor to be just before the character with offset <var title="">end</var> . <div class="example"> To obtain the currently selected text, the following JavaScript suffices: <pre> var selectionText = control.value.substring(control.selectionStart, control.selectionEnd); </pre> ...where <var title="">control</var> is the <code>input</code> or <code>textarea</code> element. </div> Characters with no visible rendering, such as U+200D ZERO WIDTH JOINER, still count as characters. Thus, for instance, the selection can include just an invisible character, and the text insertion cursor can be placed to one side or another of such a character. When these methods and attributes are used with <code>input</code> elements that are not displaying simple text fields, they must raise an <code>INVALID_STATE_ERR</code> exception. <h3 id="command"><ins class= "diff-new">5.6</ins> <ins class="diff-new">Command APIs</ins></h3> <ins class="diff-new">The</ins> <dfn id="execCommand" title= "dom-document-execCommand"><code><ins class= "diff-new">execCommand(</ins> <var title=""><ins class= "diff-new">commandId</ins></var> ,<var title=""><ins class= "diff-new">showUI</ins></var> ,<var title=""><ins class= "diff-new">value</ins></var> <ins class= "diff-new">)</ins></code></dfn> <ins class="diff-new">method on the</ins> <code><a href="#htmldocument"><ins class= "diff-new">HTMLDocument</ins></a></code> <ins class= "diff-new">interface allows scripts to perform actions on the</ins> <a href="#a-selection" title="the selection"><ins class= "diff-new">current selection</ins></a> <ins class="diff-new">or at the current caret position. Generally, these commands would be used to implement editor UI, for example having a "delete" button on a toolbar.</ins> <ins class="diff-new">There are three variants to this method, with one, two, and three arguments respectively. The</ins> <var title=""><ins class="diff-new">showUI</ins></var> <ins class= "diff-new">and</ins> <var title=""><ins class= "diff-new">value</ins></var> <ins class="diff-new">parameters, even if specified, are ignored unless otherwise stated.</ins> <ins class="diff-new">When</ins> <code title= "dom-document-execCommand"><a href="#execCommand"><ins class= "diff-new">execCommand()</ins></a></code> <ins class="diff-new">is invoked, the user agent must follow the following steps:</ins> <ol> <li><ins class="diff-new">If the given</ins> <var title= ""><ins class="diff-new">commandId</ins></var> <ins class= "diff-new">maps to an entry in the list below whose "Enabled When" entry has a condition that is currently false, do nothing; abort these steps.</ins></li> <li><ins class="diff-new">Otherwise, execute the "Action" listed below for the given</ins> <var title=""><ins class= "diff-new">commandId</ins></var> .</li> </ol> <ins class="diff-new">A document is</ins> <dfn id= "ready"><ins class="diff-new">ready for editing host commands</ins></dfn> <ins class="diff-new">if it has a selection that is entirely within an</ins> <a href="#editing1"><ins class= "diff-new">editing host</ins></a> ,<ins class="diff-new">or if it has no selection but its caret is inside an</ins> <a href= "#editing1"><ins class="diff-new">editing host</ins></a> . <ins class="diff-new">The</ins> <dfn id="querycommandenabled" title="dom-document-queryCommandEnabled"><code><ins class= "diff-new">queryCommandEnabled(</ins> <var title=""><ins class= "diff-new">commandId</ins></var> <ins class= "diff-new">)</ins></code></dfn> <ins class="diff-new">method, when invoked, must return true if the condition listed below under "Enabled When" for the given</ins> <var title=""><ins class= "diff-new">commandId</ins></var> <ins class="diff-new">is true, and false otherwise.</ins> <ins class="diff-new">The</ins> <dfn id="querycommandindeterm" title="dom-document-queryCommandIndeterm"><code><ins class= "diff-new">queryCommandIndeterm(</ins> <var title=""><ins class= "diff-new">commandId</ins></var> <ins class= "diff-new">)</ins></code></dfn> <ins class="diff-new">method, when invoked, must return true if the condition listed below under "Indeterminate When" for the given</ins> <var title=""><ins class= "diff-new">commandId</ins></var> <ins class="diff-new">is true, and false otherwise.</ins> <ins class="diff-new">The</ins> <dfn id="querycommandstate" title="dom-document-queryCommandState"><code><ins class= "diff-new">queryCommandState(</ins> <var title=""><ins class= "diff-new">commandId</ins></var> <ins class= "diff-new">)</ins></code></dfn> <ins class="diff-new">method, when invoked, must return the value expressed below under "State" for the given</ins> <var title=""><ins class= "diff-new">commandId</ins></var> . <ins class="diff-new">The</ins> <dfn id="querycommandsupported" title="dom-document-queryCommandSupported"><code><ins class= "diff-new">queryCommandSupported(</ins> <var title=""><ins class= "diff-new">commandId</ins></var> <ins class= "diff-new">)</ins></code></dfn> <ins class="diff-new">method, when invoked, must return true if the given</ins> <var title= ""><ins class="diff-new">commandId</ins></var> <ins class= "diff-new">is in the list below, and false otherwise.</ins> <ins class="diff-new">The</ins> <dfn id="querycommandvalue" title="dom-document-queryCommandValue"><code><ins class= "diff-new">queryCommandValue(</ins> <var title=""><ins class= "diff-new">commandId</ins></var> <ins class= "diff-new">)</ins></code></dfn> <ins class="diff-new">method, when invoked, must return the value expressed below under "Value" for the given</ins> <var title=""><ins class= "diff-new">commandId</ins></var> . <ins class="diff-new">The possible values for</ins> <var title= ""><ins class="diff-new">commandId</ins></var> ,<ins class= "diff-new">and their corresponding meanings, are as follows. These values are case-insensitive.</ins> <dl> <dt><dfn id="bold" title="command-bold"><code><ins class= "diff-new">bold</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must act as if the user had requested that the selection</ins> <a href= "#contenteditable-wrapSemantic"><ins class="diff-new">be wrapped in the semantics</ins></a> <ins class="diff-new">of the</ins> <code><a href="#b"><ins class= "diff-new">b</ins></a></code> <ins class="diff-new">element (or, again, unwrapped, or have that semantic inserted or removed, as defined by the UA).</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">True if the selection, or the caret, if there is no selection, is, or is contained within, a</ins> <code><a href= "#b"><ins class="diff-new">b</ins></a></code> <ins class= "diff-new">element. False otherwise.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">The string "</ins> <code title=""><ins class= "diff-new">true</ins></code> <ins class="diff-new">" if the expression given for the "State" above is true, the string "</ins> <code title=""><ins class="diff-new">false</ins></code> <ins class= "diff-new">" otherwise.</ins></dd> <dt><dfn id="createlink" title= "command-createLink"><code><ins class= "diff-new">createLink</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must act as if the user had requested that the selection</ins> <a href= "#contenteditable-wrapSemantic"><ins class="diff-new">be wrapped in the semantics</ins></a> <ins class="diff-new">of the</ins> <code><a href="#a"><ins class= "diff-new">a</ins></a></code> <ins class="diff-new">element (or, again, unwrapped, or have that semantic inserted or removed, as defined by the UA). If the user agent creates an</ins> <code><a href="#a"><ins class="diff-new">a</ins></a></code> <ins class="diff-new">element or modifies an existing</ins> <code><a href="#a"><ins class="diff-new">a</ins></a></code> <ins class="diff-new">element, then if the</ins> <var title= ""><ins class="diff-new">showUI</ins></var> <ins class= "diff-new">argument is present and has the value false, then the value of the</ins> <var title=""><ins class= "diff-new">value</ins></var> <ins class="diff-new">argument must be used as the URI of the link. Otherwise, the user should be prompted for the URI of the link.</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="delete" title="command-delete"><code><ins class= "diff-new">delete</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must act as if the user had performed</ins> <a href="#contenteditable-delete"><ins class= "diff-new">a backspace operation</ins></a> .</dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="formatblock" title= "command-formatBlock"><code><ins class= "diff-new">formatBlock</ins></code></dfn></dt> <dd> <ins class="diff-new">Action:</ins> <ins class= "diff-new">The user agent must run the following steps:</ins> <ol> <li> <ins class="diff-new">If the</ins> <var title=""><ins class= "diff-new">value</ins></var> <ins class="diff-new">argument wasn't specified, abort these steps without doing anything.</ins> </li> <li> <ins class="diff-new">If the</ins> <var title=""><ins class= "diff-new">value</ins></var> <ins class="diff-new">argument has a leading U+003C LESS-THAN SIGN character ('<') and a trailing U+003E GREATER-THAN SIGN character ('> '), then remove the first and last characters from</ins> <var title=""><ins class= "diff-new">value</ins></var> . </li> <li> <ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">value</ins></var> <ins class="diff-new">is (now) a case-insensitive match for the tag name of an element defined by this specification that is defined to be a</ins> <ins class= "diff-new">prose element</ins> <ins class="diff-new">but not a</ins> <ins class="diff-new">phrasing element</ins> ,<ins class="diff-new">then, for every position in the selection, take the furthest</ins> <a href="#flow-content0"><ins class= "diff-new">flow content</ins></a> <ins class="diff-new">ancestor element of that position that contains only</ins> <a href= "#phrasing0"><ins class="diff-new">phrasing content</ins></a> ,<ins class="diff-new">and, if that element is</ins> <a href= "#editable0"><ins class="diff-new">editable</ins></a> ,<ins class= "diff-new">and has a content model that allows it to contain</ins> <ins class="diff-new">prose content</ins> <ins class= "diff-new">other than</ins> <a href="#phrasing0"><ins class= "diff-new">phrasing content</ins></a> ,<ins class="diff-new">and has a parent element whose content model allows that parent to contain any</ins> <ins class="diff-new">prose content</ins> ,<ins class="diff-new">rename the element (as if the</ins> <code title=""><ins class= "diff-new">Element.renameNode()</ins></code> <ins class= "diff-new">method had been used) to</ins> <var title=""><ins class= "diff-new">value</ins></var> ,<ins class="diff-new">using the HTML namespace.</ins> <ins class="diff-new">If there is no selection, then, where in the description above refers to the selection, the user agent must act as if the selection was an empty range (with just one position) at the caret position.</ins> </li> </ol> </dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="forwarddelete" title= "command-forwardDelete"><code><ins class= "diff-new">forwardDelete</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must act as if the user had performed</ins> <a href="#contenteditable-delete"><ins class= "diff-new">a forward delete operation</ins></a> .</dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="insertimage" title= "command-insertImage"><code><ins class= "diff-new">insertImage</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must act as if the user had requested that the selection</ins> <a href= "#contenteditable-wrapSemantic"><ins class="diff-new">be wrapped in the semantics</ins></a> <ins class="diff-new">of the</ins> <code><a href="#img"><ins class= "diff-new">img</ins></a></code> <ins class="diff-new">element (or, again, unwrapped, or have that semantic inserted or removed, as defined by the UA). If the user agent creates an</ins> <code><a href="#img"><ins class="diff-new">img</ins></a></code> <ins class="diff-new">element or modifies an existing</ins> <code><a href="#img"><ins class="diff-new">img</ins></a></code> <ins class="diff-new">element, then if the</ins> <var title= ""><ins class="diff-new">showUI</ins></var> <ins class= "diff-new">argument is present and has the value false, then the value of the</ins> <var title=""><ins class= "diff-new">value</ins></var> <ins class="diff-new">argument must be used as the URI of the image. Otherwise, the user should be prompted for the URI of the image.</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="inserthtml" title= "command-insertHTML"><code><ins class= "diff-new">insertHTML</ins></code></dfn></dt> <dd> <ins class="diff-new">Action:</ins> <ins class= "diff-new">The user agent must run the following steps:</ins> <ol> <li> <ins class="diff-new">If the</ins> <var title=""><ins class= "diff-new">value</ins></var> <ins class="diff-new">argument wasn't specified, abort these steps without doing anything.</ins> </li> <li> <ins class="diff-new">If there is a selection, act as if the user had requested that</ins> <a href= "#contenteditable-delete"><ins class="diff-new">the selection be deleted</ins></a> . </li> <li> <ins class="diff-new">Invoke the</ins> <a href= "#html-fragment0"><ins class="diff-new">HTML fragment parsing algorithm</ins></a> <ins class="diff-new">with an arbitrary orphan</ins> <code><a href="#body0"><ins class= "diff-new">body</ins></a></code> <ins class="diff-new">element as the</ins> <a href="#context0"><ins class= "diff-new">context</ins></a> <ins class="diff-new">element and with the</ins> <var title=""><ins class= "diff-new">value</ins></var> <ins class="diff-new">argument as</ins> <ins class="diff-new">input</ins> . </li> <li> <ins class="diff-new">Insert the nodes returned by the previous step into the document at the location of the caret.</ins> </li> </ol> </dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="insertlinebreak" title= "command-insertLineBreak"><code><ins class= "diff-new">insertLineBreak</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must act as if the user had</ins> <a href="#contenteditable-br"><ins class= "diff-new">requested a line separator</ins></a> .</dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="insertorderedlist" title= "command-insertOrderedList"><code><ins class= "diff-new">insertOrderedList</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must act as if the user had requested that the selection</ins> <a href= "#contenteditable-wrapSemantic"><ins class="diff-new">be wrapped in the semantics</ins></a> <ins class="diff-new">of the</ins> <code><a href="#ol"><ins class="diff-new">ol</ins></a></code> <ins class="diff-new">element (or unwrapped, or, if there is no selection, have that semantic inserted or removed — the exact behavior is UA-defined).</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="insertorderedlist0" title= "command-insertOrderedList"><code><ins class= "diff-new">insertOrderedList</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must act as if the user had requested that the selection</ins> <a href= "#contenteditable-wrapSemantic"><ins class="diff-new">be wrapped in the semantics</ins></a> <ins class="diff-new">of the</ins> <code><a href="#ul"><ins class="diff-new">ul</ins></a></code> <ins class="diff-new">element (or unwrapped, or, if there is no selection, have that semantic inserted or removed — the exact behavior is UA-defined).</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="insertparagraph" title= "command-insertParagraph"><code><ins class= "diff-new">insertParagraph</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must act as if the user had performed a</ins> <a href="#contenteditable-breakBlock"><ins class= "diff-new">break block</ins></a> <ins class="diff-new">editing action.</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="inserttext" title= "command-insertText"><code><ins class= "diff-new">insertText</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must act as if the user had</ins> <a href="#contenteditable-insertText"><ins class= "diff-new">inserted text</ins></a> <ins class= "diff-new">corresponding to the</ins> <var title=""><ins class= "diff-new">value</ins></var> <ins class= "diff-new">parameter.</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="italic" title="command-italic"><code><ins class= "diff-new">italic</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must act as if the user had requested that the selection</ins> <a href= "#contenteditable-wrapSemantic"><ins class="diff-new">be wrapped in the semantics</ins></a> <ins class="diff-new">of the</ins> <code><a href="#i"><ins class= "diff-new">i</ins></a></code> <ins class="diff-new">element (or, again, unwrapped, or have that semantic inserted or removed, as defined by the UA).</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">True if the selection, or the caret, if there is no selection, is, or is contained within, a</ins> <code><a href= "#i"><ins class="diff-new">i</ins></a></code> <ins class= "diff-new">element. False otherwise.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">The string "</ins> <code title=""><ins class= "diff-new">true</ins></code> <ins class="diff-new">" if the expression given for the "State" above is true, the string "</ins> <code title=""><ins class="diff-new">false</ins></code> <ins class= "diff-new">" otherwise.</ins></dd> <dt><dfn id="redo0" title="command-redo"><code><ins class= "diff-new">redo</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must</ins> <a href= "#redo-moving0" title="do-redo"><ins class="diff-new">move forward one step</ins></a> <ins class="diff-new">in its</ins> <a href= "#undo-transaction"><ins class="diff-new">undo transaction history</ins></a> ,<ins class="diff-new">restoring the associated state. If the</ins> <a href="#current4"><ins class="diff-new">undo position</ins></a> <ins class="diff-new">is at the end of the</ins> <a href="#undo-transaction"><ins class="diff-new">undo transaction history</ins></a> ,<ins class="diff-new">the user agent must do nothing. See the</ins> <a href="#undo-history"><ins class= "diff-new">undo history</ins></a> .</dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The</ins> <a href="#current4"><ins class= "diff-new">undo position</ins></a> <ins class="diff-new">is not at the end of the</ins> <a href="#undo-transaction"><ins class= "diff-new">undo transaction history</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="selectall0" title= "command-selectAll"><code><ins class="diff-new">selectAll</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must change the selection so that all the content in the currently focused</ins> <a href= "#editing1"><ins class="diff-new">editing host</ins></a> <ins class="diff-new">is selected. If no</ins> <a href= "#editing1"><ins class="diff-new">editing host</ins></a> <ins class="diff-new">is focused, then the content of the entire document must be selected.</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">Always.</ins></dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="subscript" title="command-subscript"><code><ins class= "diff-new">subscript</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must act as if the user had requested that the selection</ins> <a href= "#contenteditable-wrapSemantic"><ins class="diff-new">be wrapped in the semantics</ins></a> <ins class="diff-new">of the</ins> <code><a href="#sub"><ins class= "diff-new">sub</ins></a></code> <ins class="diff-new">element (or, again, unwrapped, or have that semantic inserted or removed, as defined by the UA).</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">True if the selection, or the caret, if there is no selection, is, or is contained within, a</ins> <code><a href= "#sub"><ins class="diff-new">sub</ins></a></code> <ins class= "diff-new">element. False otherwise.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">The string "</ins> <code title=""><ins class= "diff-new">true</ins></code> <ins class="diff-new">" if the expression given for the "State" above is true, the string "</ins> <code title=""><ins class="diff-new">false</ins></code> <ins class= "diff-new">" otherwise.</ins></dd> <dt><dfn id="superscript" title= "command-superscript"><code><ins class= "diff-new">superscript</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must act as if the user had requested that the selection</ins> <a href= "#contenteditable-wrapSemantic"><ins class="diff-new">be wrapped in the semantics</ins></a> <ins class="diff-new">of the</ins> <code><a href="#sup"><ins class="diff-new">sup</ins></a></code> <ins class="diff-new">element (or unwrapped, or, if there is no selection, have that semantic inserted or removed — the exact behavior is UA-defined).</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document is</ins> <a href= "#ready"><ins class="diff-new">ready for editing host commands</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">True if the selection, or the caret, if there is no selection, is, or is contained within, a</ins> <code><a href= "#sup"><ins class="diff-new">sup</ins></a></code> <ins class= "diff-new">element. False otherwise.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">The string "</ins> <code title=""><ins class= "diff-new">true</ins></code> <ins class="diff-new">" if the expression given for the "State" above is true, the string "</ins> <code title=""><ins class="diff-new">false</ins></code> <ins class= "diff-new">" otherwise.</ins></dd> <dt><dfn id="undo1" title="command-undo"><code><ins class= "diff-new">undo</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must</ins> <a href= "#undo-moving0" title="do-undo"><ins class="diff-new">move back one step</ins></a> <ins class="diff-new">in its</ins> <a href= "#undo-transaction"><ins class="diff-new">undo transaction history</ins></a> ,<ins class="diff-new">restoring the associated state. If the</ins> <a href="#current4"><ins class="diff-new">undo position</ins></a> <ins class="diff-new">is at the start of the</ins> <a href="#undo-transaction"><ins class="diff-new">undo transaction history</ins></a> ,<ins class="diff-new">the user agent must do nothing. See the</ins> <a href="#undo-history"><ins class= "diff-new">undo history</ins></a> .</dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The</ins> <a href="#current4"><ins class= "diff-new">undo position</ins></a> <ins class="diff-new">is not at the start of the</ins> <a href="#undo-transaction"><ins class= "diff-new">undo transaction history</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="unlink" title="command-unlink"><code><ins class= "diff-new">unlink</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must remove all</ins> <code><a href="#a"><ins class="diff-new">a</ins></a></code> <ins class="diff-new">elements that have</ins> <code title= "attr-a-href"><ins class="diff-new">href</ins></code> <ins class= "diff-new">attributes and that are partially or completely included in the current selection.</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">The document has a selection that is entirely within an</ins> <a href="#editing1"><ins class="diff-new">editing host</ins></a> .</dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><dfn id="unselect" title="command-unselect"><code><ins class= "diff-new">unselect</ins></code></dfn></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">The user agent must change the selection so that nothing is selected.</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">Always.</ins></dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> <dt><code><var title=""><ins class="diff-new">vendorID</ins></var> <ins class="diff-new">-</ins> <var title=""><ins class= "diff-new">customCommandID</ins></var></code></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">User agents may implement vendor-specific extensions to this API. Vendor-specific extensions to the list of commands should use the syntax</ins> <code><var title= ""><ins class="diff-new">vendorID</ins></var> <ins class= "diff-new">-</ins> <var title=""><ins class= "diff-new">customCommandID</ins></var></code> <ins class= "diff-new">so as to prevent clashes between extensions from different vendors and future additions to this specification.</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">UA-defined.</ins></dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">UA-defined.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">UA-defined.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">UA-defined.</ins></dd> <dt><ins class="diff-new">Anything else</ins></dt> <dd><ins class="diff-new">Action:</ins> <ins class="diff-new">User agents must do nothing.</ins></dd> <dd><ins class="diff-new">Enabled When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">Indeterminate When:</ins> <ins class="diff-new">Never.</ins></dd> <dd><ins class="diff-new">State:</ins> <ins class= "diff-new">Always false.</ins></dd> <dd><ins class="diff-new">Value:</ins> <ins class= "diff-new">Always the string "</ins> <code title=""><ins class= "diff-new">false</ins></code> <ins class="diff-new">".</ins></dd> </dl> <h2 id="comms">6. Communication</h2> <h3 id="event1"><del class= "diff-old">6.1.</del> <ins class="diff-chg">6.1</ins> Event definitions</h3> Messages in <a href="#cross-document">cross-document messaging</a> <del class="diff-old">and, by default,</del> <ins class="diff-chg">and</ins> in <a href= "#server-sent">server-sent DOM events</a> , use the <dfn id= "message0" title="event-message"><code>message</code></dfn> event. The following interface is defined for this event: <pre class="idl"> interface <dfn id="messageevent">MessageEvent</dfn> : Event { readonly attribute DOMString <a href="#data4" title= "dom-MessageEvent-data">data</a>; <del class="diff-old"> readonly attribute DOMString ; readonly attribute DOMString ; readonly attribute ; void (in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMString dataArg, in DOMString domainArg, in DOMString uriArg, in Window sourceArg); void (in DOMString namespaceURI, in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMString dataArg, in DOMString domainArg, in DOMString uriArg, in Window sourceArg); </del> <ins class="diff-chg"> readonly attribute DOMString <a href= "#origin1" title="dom-MessageEvent-origin">origin</a>; readonly attribute DOMString <a href="#lasteventid" title= "dom-MessageEvent-lastEventId">lastEventId</a>; readonly attribute <a href="#window">Window</a> <a href= "#source3" title="dom-MessageEvent-source">source</a>; void <a href="#initmessageevent" title= "dom-MessageEvent-initMessageEvent">initMessageEvent</a>(in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMString dataArg, in DOMString originArg, in DOMString lastEventIdArg, in Window sourceArg); void <a href="#initmessageeventns" title= "dom-MessageEvent-initMessageEventNS">initMessageEventNS</a>(in DOMString namespaceURI, in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMString dataArg, in DOMString originArg, in DOMString lastEventIdArg, in Window sourceArg); </ins> }; </pre> The <dfn id="initmessageevent" title= "dom-MessageEvent-initMessageEvent"><code>initMessageEvent()</code></dfn> and <dfn id="initmessageeventns" title= "dom-MessageEvent-initMessageEventNS"><code>initMessageEventNS()</code></dfn> methods must initialise the event in a manner analogous to the similarly-named methods in the DOM3 Events interfaces. <a href= "#references">[DOM3EVENTS]</a> The <dfn id="data4" title= "dom-MessageEvent-data"><code>data</code></dfn> attribute represents the message being sent. The <dfn id="origin1" title= "dom-MessageEvent-origin"><code><del class="diff-old">domain</del> <ins class="diff-chg">origin</ins></code></dfn> attribute represents, in <a href="#cross-document">cross-document messaging</a> , the <del class="diff-old">domain</del> <a href= "#origin0"><ins class="diff-chg">origin</ins></a> of the document <del class="diff-old">from which</del> <ins class="diff-chg">that sent</ins> the message <del class="diff-old">came.</del> <ins class="diff-chg">(typically the scheme, hostname, and port of the document, but not its path or fragment identifier).</ins> The <dfn id="lasteventid" title= "dom-MessageEvent-lastEventId"><code><del class= "diff-old">uri</del> <ins class= "diff-chg">lastEventId</ins></code></dfn> attribute represents, in <del class="diff-old">cross-document messaging</del> <a href= "#server-sent"><ins class="diff-chg">server-sent dom events</ins></a> , the <del class="diff-old">address</del> <ins class="diff-chg">last event ID string</ins> of the <del class="diff-old">document from which the message came.</del> <ins class="diff-chg">event source.</ins> The <dfn id="source3" title= "dom-MessageEvent-source"><code>source</code></dfn> attribute represents, in <a href="#cross-document">cross-document messaging</a> , the <code><a href="#window">Window</a></code> from which the message came. <h3 id="server-sent-events"><del class= "diff-old">6.2.</del> <ins class="diff-chg">6.2</ins> <dfn id="server-sent">Server-sent DOM events</dfn></h3> This section describes a mechanism for allowing servers to dispatch DOM events into documents that expect it. The <code><a href="#event-source">event-source</a></code> element provides a simple interface to this mechanism. <h4 id="the-remoteeventtarget"><del class= "diff-old">6.2.1.</del> <ins class="diff-chg">6.2.1</ins> The <dfn id= "remoteeventtarget"><code>RemoteEventTarget</code></dfn> interface</h4> Any object that implements the <code>EventTarget</code> interface must also implement the <code><a href= "#remoteeventtarget0">RemoteEventTarget</a></code> interface. <pre class="idl"> interface <dfn id="remoteeventtarget0">RemoteEventTarget</dfn> { void <a href="#addeventsource" title= "dom-RemoteEventTarget-addEventSource">addEventSource</a>(in DOMString src); void <a href="#removeeventsource" title= "dom-RemoteEventTarget-removeEventSource">removeEventSource</a>(in DOMString src); }; </pre> When the <dfn id="addeventsource" title= "dom-RemoteEventTarget-addEventSource"><code>addEventSource( <var title="">src</var> )</code></dfn> method is invoked, the user agent must add the URI specified in <var title="">src</var> to the <a href="#list-of3" title="concept-event-source-list">list of event sources</a> for that object. The same URI can be registered multiple times. When the <dfn id="removeeventsource" title= "dom-RemoteEventTarget-removeEventSource"><code>removeEventSource( <var title="">src</var> )</code></dfn> method is invoked, the user agent must remove the URI specified in <var title="">src</var> from the <a href="#list-of3" title="concept-event-source-list">list of event sources</a> for that object. If the same URI has been registered multiple times, removing it must <del class= "diff-old">only</del> remove <ins class="diff-new">only</ins> one instance of that URI for each invocation of the <code title= "removeEventSource">removeEventSource()</code> method. Relative URIs must be resolved relative to ... . <h4 id="connecting"><del class= "diff-old">6.2.2.</del> <ins class="diff-chg">6.2.2</ins> Connecting to an event stream</h4> Each object implementing the <code>EventTarget</code> and <code><a href="#remoteeventtarget0">RemoteEventTarget</a></code> interfaces has a <dfn id="list-of3" title= "concept-event-source-list">list of event sources</dfn> that are registered for that object. When a new URI is added to this list, the user agent should, as soon as all currently executing scripts (if any) have finished executing, and if the specified URI isn't removed from the list before they do so, fetch the resource identified by that URI. When an event source is removed from the list of event sources for an object, if that resource is still being fetched, then the relevant connection must be closed. Since connections established to remote servers for such resources are expected to be long-lived, UAs should ensure that appropriate buffering is used. In particular, while line buffering may be safe if lines are defined to end with a single U+000A LINE FEED character, block buffering or line buffering with different expected line endings can cause delays in event dispatch. <ins class="diff-new">Each event source in the list must have associated with it the following:</ins> <ul> <li><ins class="diff-new">The</ins> <dfn id="reconnection" title= "concept-event-stream-reconnection-time"><ins class= "diff-new">reconnection time</ins></dfn> ,<ins class="diff-new">in milliseconds. This must initially be a user-agent-defined value, probably in the region of a few seconds.</ins></li> <li><ins class="diff-new">The</ins> <dfn id="last-event" title= "concept-event-stream-last-event-id"><ins class="diff-new">last event ID string</ins></dfn> .<ins class="diff-new">This must initially be the empty string.</ins></li> </ul> In general, the semantics of the transport protocol specified by the URIs for the event sources must be followed, including HTTP caching rules. For HTTP connections, the <code title="">Accept</code> header may be included; if included, it must <del class= "diff-old">only</del> contain <ins class="diff-new">only</ins> formats of event framing that are supported by the user agent (one of which must be <code><del class= "diff-old">application/x-dom-event-stream</del> <ins class= "diff-chg">text/event-stream</ins></code> , as described below). Other formats of event framing may also be supported in addition to <code><del class="diff-old">application/x-dom-event-stream</del> <ins class="diff-chg">text/event-stream</ins></code> , but this specification does not define how they are to be parsed or processed. Such formats could include systems like SMS-push; for example servers could use <code title="">Accept</code> headers and HTTP redirects to an SMS-push mechanism as a kind of protocol negotiation to reduce network load in GSM environments. User agents should use the <code>Cache-Control: no-cache</code> header in requests to bypass any caches for requests of event sources. <ins class="diff-new">If the event source's last event ID string is not the empty string, then a</ins> <code title=""><ins class= "diff-new">Last-Event-ID</ins></code> <ins class="diff-new">HTTP header must be included with the request, whose value is the value of the event source's last event ID string.</ins> For connections to domains other than <a href="#domain0">the document's domain</a> , the semantics of the Access-Control HTTP header must be followed. <a href= "#references">[ACCESSCONTROL]</a> HTTP 200 OK responses with a <a href= "#content-type8">Content-Type</a> header specifying the type <code><del class="diff-old">application/x-dom-event-stream</del> <ins class="diff-chg">text/event-stream</ins></code> that are either from <a href="#domain0">the document's domain</a> or explicitly allowed by the Access-Control HTTP headers must be processed line by line <a href="#event-stream-interpretation">as described below</a> . For the purposes of such successfully opened event streams only, user agents should ignore HTTP cache headers, and instead assume that the resource indicates that it does not wish to be cached. If such a resource completes loading (i.e. the entire HTTP response body is received or the connection itself closes), the user agent should request the event source resource again after a delay <ins class="diff-new">equal to the reconnection time</ins> of <del class="diff-old">approximately five seconds.</del> <ins class= "diff-chg">the event source.</ins> HTTP 200 OK responses that have a <a href= "#content-type8">Content-Type</a> other than <code><del class= "diff-old">application/x-dom-event-stream</del> <ins class= "diff-chg">text/event-stream</ins></code> (or some other supported type), and HTTP responses whose Access-Control headers indicate that the resource are not to be used, must be ignored and must prevent the user agent from refetching the resource for that event source. HTTP 201 Created, 202 Accepted, 203 Non-Authoritative Information, and 206 Partial Content responses must be treated like HTTP 200 OK responses for the purposes of reopening event source resources. They are, however, likely to indicate an error has occurred somewhere and may cause the user agent to emit a warning. HTTP 204 No Content, and 205 Reset Content responses must be treated as if they were 200 OK responses with the right MIME type but no content, and should therefore cause the user agent to refetch the resource after a <del class="diff-old">short delay.</del> <ins class="diff-chg">delay equal to the reconnection time of the event source.</ins> HTTP 300 Multiple Choices responses should be handled automatically if possible (treating the responses as if they were 302 Found responses pointing to the appropriate resource), and otherwise must be treated as HTTP 404 responses. HTTP 301 Moved Permanently responses must cause the user agent to reconnect using the new server specified URI instead of the previously specified URI for all subsequent requests for this event source. (It doesn't affect other event sources with the same URI unless they also receive 301 responses, and it doesn't affect future sessions, e.g. if the page is reloaded.) HTTP 302 Found, 303 See Other, and 307 Temporary Redirect responses must cause the user agent to connect to the new server-specified URI, but if the user agent needs to again request the resource at a later point, it must return to the previously specified URI for this event source. HTTP 304 Not Modified responses should be handled like HTTP 200 OK responses, with the content coming from the user agent cache. A new request should then be made after a <del class= "diff-old">short</del> delay <ins class="diff-new">equal to the reconnection time</ins> of <del class="diff-old">approximately five seconds.</del> <ins class="diff-chg">the event source.</ins> HTTP 305 Use Proxy, HTTP 401 Unauthorized, and 407 Proxy Authentication Required should be treated transparently as for any other subresource. Any other HTTP response code not listed here should cause the user agent to stop trying to process this event source. DNS errors must be considered fatal, and cause the user agent to not open any connection for that event source. For non-HTTP protocols, UAs should act in equivalent ways. <h4 id="parsing1"><del class= "diff-old">6.2.3.</del> <ins class="diff-chg">6.2.3</ins> Parsing an event stream</h4> This event stream format's MIME type is <code><del class= "diff-old">application/x-dom-event-stream</del> <ins class= "diff-chg">text/event-stream</ins></code> . The event stream format is (in pseudo-BNF): <pre> <stream> ::= <bom>? <event>* <del class= "diff-old"><event> ::= [ <comment> | <command> | <field> ]* <newline> <comment> ::= ';' <any-char>* <newline> <command> ::= ':' <any-char>* <newline> <field> ::= <name> [ ':' <space>? <any-char>* ]? <newline> <name> ::= <name-start-char> <name-char>* </del> <ins class= "diff-chg"><event> ::= [ <comment> | <field> ]* <newline> <comment> ::= <colon> <any-char>* <newline> <field> ::= <name-char>+ [ <colon> <space>? <any-char>* ]? <newline> </ins> # characters: <bom> ::= a single U+FEFF BYTE ORDER MARK character <space> ::= a single U+0020 SPACE character (' ') <newline> ::= a U+000D CARRIAGE RETURN character followed by a U+000A LINE FEED character | a single U+000D CARRIAGE RETURN character | a single U+000A LINE FEED character | the end of the file <del class= "diff-old"><name-start-char> ::= a single Unicode character other than ':', ';', U+000D CARRIAGE RETURN and U+000A LINE FEED </del> <ins class= "diff-chg"><colon> ::= a single U+003A COLON character (':') </ins> <name-char> ::= a single Unicode character other than <del class= "diff-old"> ':', U+000D CARRIAGE RETURN and U+000A LINE FEED </del> <ins class= "diff-chg"> U+003A COLON, U+000D CARRIAGE RETURN and U+000A LINE FEED </ins> <any-char> ::= a single Unicode character other than U+000D CARRIAGE RETURN and U+000A LINE FEED </pre> Event streams in this format must always be encoded as UTF-8. Lines must be separated by either a U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF) character pair, a single U+000A LINE FEED (LF) character, or a single U+000D CARRIAGE RETURN (CR) character. <del class="diff-old">User agents must treat those three variants as equivalent line terminators.</del> <h4 id="event-stream-interpretation"><ins class="diff-chg">6.2.4</ins> <ins class= "diff-chg">Interpreting an event stream</ins></h4> Bytes or sequences of bytes that are not valid UTF-8 sequences must be interpreted as the U+FFFD REPLACEMENT CHARACTER. One leading U+FEFF BYTE ORDER MARK character must be ignored if any are present. The stream must then be parsed by reading everything line by line, <del class="diff-old">in blocks separated by blank lines. Comment lines (those starting</del> with <del class= "diff-old">the</del> <ins class="diff-chg">a U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF)</ins> character <del class= "diff-old">';')</del> <ins class="diff-chg">pair, a single U+000A LINE FEED (LF) character, a single U+000D CARRIAGE RETURN (CR) character,</ins> and <del class="diff-old">command lines (those starting with the character ':') must be ignored. Command lines are reserved for future extensions. For each non-blank, non-comment, non-command line, the field name must first be taken. This is everything on</del> the <del class="diff-old">line up to but not including</del> <ins class="diff-chg">end of</ins> the <del class= "diff-old">first colon (':') or</del> <ins class="diff-chg">file being</ins> the <ins class="diff-new">four ways in which a</ins> line <del class="diff-old">terminator, whichever comes first. Then, if there was</del> <ins class="diff-chg">can end.</ins> <ins class="diff-chg">When</ins> a <del class="diff-old">colon, the</del> <ins class="diff-chg">stream is parsed, a</ins> <var title="">data <del class="diff-old">for that line</del></var> <ins class="diff-chg">buffer and an</ins> <var title=""><ins class= "diff-chg">event name</ins></var> <ins class= "diff-chg">buffer</ins> must be <del class="diff-old">taken. This is everything after the colon, ignoring a single space after the colon if there is one, up</del> <ins class="diff-chg">associated with it. They must be initialized</ins> to the <del class= "diff-old">end of</del> <ins class="diff-chg">empty string</ins> <ins class="diff-chg">Lines must be processed, in</ins> the <del class="diff-old">line.</del> <ins class="diff-chg">order they are received, as follows:</ins> <dl class="switch"> <dt>If <del class="diff-old">there was no colon</del> the <del class="diff-old">data</del> <ins class="diff-chg">line</ins> is <del class="diff-old">the</del> empty <del class= "diff-old">string. Examples: Field name: Field data This is a</del> <ins class="diff-chg">(a</ins> blank <del class= "diff-old">field 1. These two lines: have the same data 2. These two lines:have the same data 1. But these two lines:  do not 2. But these two lines: do not</del> <ins class= "diff-chg">line)</ins></dt> <dd> <a href="#dispatchMessage"><ins class="diff-new">Dispatch the event</ins></a> ,<ins class="diff-new">as defined below.</ins> </dd> <dt>If <ins class="diff-new">the line starts with</ins> a <del class="diff-old">field name occurs multiple times in a block,</del> <ins class="diff-chg">U+003A COLON character (':')</ins></dt> <dd> <ins class="diff-chg">Ignore</ins> the <del class= "diff-old">value for that field in that black must consist of</del> <ins class="diff-chg">line.</ins> </dd> <dt><ins class="diff-chg">If the line contains a U+003A COLON character (':') character</ins></dt> <dd> <ins class="diff-chg">Collect</ins> the <del class= "diff-old">data parts for each of those lines, concatenated with U+000A LINE FEED</del> characters <del class="diff-old">between them (regardless of what</del> <ins class="diff-chg">on</ins> the line <del class="diff-old">terminators used in</del> <ins class= "diff-chg">before</ins> the <del class="diff-old">stream actually are).</del> <ins class="diff-chg">first U+003A COLON character (':'), and let</ins> <var title=""><ins class= "diff-chg">field</ins></var> <ins class="diff-chg">be that string.</ins> <del class="diff-old">For example,</del> <ins class= "diff-chg">Collect</ins> the <del class="diff-old">following block: Test: Line 1 Foo:  Bar Test: Line 2 ...is treated as having two fields, one called Test with</del> <ins class="diff-chg">characters on</ins> the <del class= "diff-old">value " Line 1\nLine 2 " (where \n represents a newline),</del> <ins class="diff-chg">line after the first U+003A COLON character (':'),</ins> and <del class="diff-old">one called Foo</del> <ins class="diff-chg">let</ins> <var title=""><ins class= "diff-chg">value</ins></var> <ins class="diff-chg">be that string. If</ins> <var title=""><ins class="diff-chg">value</ins></var> <ins class="diff-chg">starts</ins> with <del class= "diff-old">the</del> <ins class="diff-chg">a single U+0020 SPACE character, remove it from</ins> <var title="">value <del class= "diff-old">"  Bar " (note the leading space character).</del></var> . <del class="diff-old">A block thus consists of all the name-value pairs for its fields. Command lines have no effect on blocks and are not considered part of a block. Since any random stream of characters matches the above format, there is no need to define any error handling.</del> <del class="diff-old">6.2.4. Interpreting an event stream Once</del> <a href= "#processField"><ins class="diff-chg">Process</ins> the <del class= "diff-old">fields have been parsed, they are interpreted as follows (these are case-sensitive exact comparisons): Event</del> field <del class="diff-old">This</del></a> <ins class="diff-chg">using the steps described below, using</ins> <var title="">field <del class="diff-old">gives</del></var> <ins class= "diff-chg">as</ins> the <ins class="diff-new">field</ins> name <del class="diff-old">of</del> <ins class="diff-chg">and</ins> <var title=""><ins class="diff-chg">value</ins></var> <ins class= "diff-chg">as</ins> the <del class="diff-old">event. For example, load , DOMActivate , updateTicker . If there is no</del> field <del class="diff-old">with this name, the name message must be used.</del> <ins class="diff-chg">value.</ins> </dd> <dt><del class="diff-old">Namespace field This field gives the DOM3 namespace for the event. (For normal DOM events this would be null.) If it isn't specified</del> <ins class= "diff-chg">Otherwise,</ins> the <del class="diff-old">event namespace</del> <ins class="diff-chg">string</ins> is <del class= "diff-old">null. Class field</del> <ins class="diff-chg">not empty but does not contain a U+003A COLON character (':') character</ins></dt> <dd> <del class="diff-old">This field gives is</del> <a href= "#processField"><ins class="diff-chg">Process</ins> the <del class= "diff-old">interface used for</del> <ins class= "diff-chg">field</ins></a> <ins class="diff-chg">using</ins> the <del class="diff-old">event, for instance Event , UIEvent , MutationEvent , KeyboardEvent , etc. For compatibility with DOM3 Events,</del> <ins class="diff-chg">steps described below, using</ins> the <del class="diff-old">values UIEvents , MouseEvents , MutationEvents , and HTMLEvents are valid values and must be treated respectively</del> <ins class="diff-chg">whole line</ins> as <del class="diff-old">meaning</del> the <del class= "diff-old">interfaces UIEvent , MouseEvent , MutationEvent ,</del> <ins class="diff-chg">field name,</ins> and <del class= "diff-old">Event . (This value can therefore be used</del> <ins class="diff-chg">the empty string</ins> as the <del class= "diff-old">argument to createEvent() .)</del> <ins class= "diff-chg">field value.</ins> </dd> </dl> <del class="diff-old">If the value is not specified but the Namespace is null and</del> <ins class="diff-chg">Once</ins> the <del class="diff-old">Event field exactly matches one</del> <ins class="diff-chg">end</ins> of the <del class="diff-old">events specified by DOM3 Events in section 1.4.2 "Complete list of event types" , then</del> <ins class="diff-chg">file is reached,</ins> the <del class="diff-old">interface used</del> <ins class= "diff-chg">user agent</ins> must <del class="diff-old">default to</del> <a href="#dispatchMessage"><ins class= "diff-chg">dispatch</ins> the <del class="diff-old">interface relevant for that</del> event <del class="diff-old">type. [DOM3EVENTS]</del></a> <del class="diff-old">For example: Event: click ...would cause Class to be treated</del> <ins class= "diff-chg">one final time,</ins> as <del class= "diff-old">MouseEvent . If</del> <ins class="diff-chg">defined below.</ins> <ins class="diff-chg">The steps to</ins> <dfn id="process" title=""><ins class="diff-chg">process</ins> the <del class="diff-old">Namespace is null</del> <ins class= "diff-chg">field</ins></dfn> <ins class="diff-chg">given a field name</ins> and <ins class="diff-new">a field value depend on</ins> the <del class="diff-old">Event</del> field <del class= "diff-old">is message (including if it was not specified explicitly), then</del> <ins class="diff-chg">name, as given in</ins> the <del class="diff-old">MessageEvent interface</del> <ins class="diff-chg">following list. Field names</ins> must be <del class="diff-old">used. Otherwise,</del> <ins class= "diff-chg">compared literally, with no case folding performed.</ins> <dl class="switch"> <dt><ins class="diff-chg">If</ins> the <del class="diff-old">Event interface must be used. It</del> <ins class="diff-chg">field name</ins> is <del class="diff-old">quite possible to give</del> <ins class="diff-chg">"event"</ins></dt> <dd> <ins class="diff-chg">Set</ins> the <del class="diff-old">wrong class for an event. This is equivalent to creating an</del> <var title="">event <del class="diff-old">in the DOM using the DOM Event APIs, but using</del> <ins class="diff-chg">name</ins></var> <ins class="diff-chg">buffer</ins> the <del class="diff-old">wrong interface for it.</del> <ins class="diff-chg">to field value.</ins> </dd> <dt><del class="diff-old">Bubbles</del> <ins class="diff-chg">If the</ins> field <ins class="diff-new">name is "data"</ins></dt> <dd> <del class="diff-old">This field specifies whether</del> <ins class="diff-chg">If</ins> the <del class= "diff-old">event</del> <var title=""><ins class= "diff-chg">data</ins></var> <ins class="diff-chg">buffer</ins> is <ins class="diff-new">not the empty string, then append a single U+000A LINE FEED character</ins> to <del class="diff-old">bubble. If it is specified and has</del> the <var title=""><ins class= "diff-new">data</ins></var> <ins class="diff-new">buffer. Append the field</ins> value <del class="diff-old">No ,</del> <ins class= "diff-chg">to</ins> the <del class="diff-old">event must not bubble.</del> <var title=""><ins class="diff-chg">data</ins></var> <ins class="diff-chg">buffer.</ins> </dd> <dt>If <del class="diff-old">it</del> <ins class="diff-chg">the field name</ins> is <del class="diff-old">specified and has any other value (including no or NO ) then</del> <ins class= "diff-chg">"id"</ins></dt> <dd> <ins class="diff-chg">Set</ins> the event <del class= "diff-old">must bubble.</del> <ins class="diff-chg">stream's</ins> <a href="#last-event" title= "concept-event-stream-last-event-id"><ins class="diff-chg">last event ID</ins></a> <ins class="diff-chg">to the field value.</ins> </dd> <dt>If <del class="diff-old">it is not specified but</del> the <del class="diff-old">Namespace</del> field <ins class= "diff-new">name</ins> is <del class="diff-old">null and</del> <ins class="diff-chg">"retry"</ins></dt> <dd> <ins class="diff-chg">If</ins> the <del class= "diff-old">Event</del> field <del class="diff-old">exactly matches one</del> <ins class="diff-chg">value consists</ins> of <del class= "diff-old">the events specified by DOM3 Events</del> <ins class= "diff-chg">only characters</ins> in <del class="diff-old">section 1.4.2 "Complete list of event types" ,</del> <ins class= "diff-chg">the range U+0030 DIGIT ZERO ('0') U+0039 DIGIT NINE ('9'),</ins> then <ins class="diff-new">interpret</ins> the <del class="diff-old">event must bubble if</del> <ins class= "diff-chg">field value as an integer in base ten, and set</ins> the <del class="diff-old">DOM3 Events spec specifies that that</del> event <del class="diff-old">bubbles, and musn't bubble if it specifies it does not. [DOM3EVENTS]</del> <ins class= "diff-chg">stream's</ins> <a href="#reconnection" title= "concept-event-stream-reconnection-time"><ins class= "diff-chg">reconnection time</ins></a> <del class="diff-old">For example: Event: load ...would cause Bubbles</del> to <del class= "diff-old">be treated as No .</del> <ins class="diff-chg">that integer.</ins> Otherwise, <ins class="diff-new">ignore</ins> the <del class="diff-old">event must bubble.</del> <ins class= "diff-chg">field.</ins> </dd> <dt><del class="diff-old">Cancelable field</del> <ins class= "diff-chg">Otherwise</ins></dt> <dd> <del class="diff-old">This</del> <ins class="diff-chg">The</ins> field <del class="diff-old">specifies whether the event can have its default action prevented. If it</del> is <del class= "diff-old">specified and has</del> <ins class= "diff-chg">ignored.</ins> </dd> </dl> <ins class="diff-chg">When</ins> the <del class="diff-old">value No ,</del> <ins class="diff-chg">user agent is required to</ins> <dfn id="dispatch" title=""><ins class= "diff-chg">dispatch</ins> the event</dfn> , <ins class= "diff-new">then the user agent</ins> must <del class="diff-old">not be cancelable.</del> <ins class="diff-chg">act as follows:</ins> <ol> <li> If <del class="diff-old">it</del> <ins class= "diff-chg">the</ins> <var title=""><ins class= "diff-chg">data</ins></var> <ins class="diff-chg">buffer</ins> is <del class="diff-old">specified</del> <ins class="diff-chg">an empty string, set the</ins> <var title=""><ins class= "diff-chg">data</ins></var> <ins class="diff-chg">buffer</ins> and <del class="diff-old">has any other value (including no or NO ) then</del> the <var title="">event <del class="diff-old">must be cancelable.</del> <ins class="diff-chg">name</ins></var> <ins class="diff-chg">buffer to the empty string and abort these steps.</ins> </li> <li> If <del class="diff-old">it</del> <ins class= "diff-chg">the</ins> <var title=""><ins class="diff-chg">event name</ins></var> <ins class="diff-chg">buffer</ins> is not <del class="diff-old">specified, but</del> the <del class= "diff-old">Namespace field</del> <ins class="diff-chg">empty string but</ins> is <del class="diff-old">null and the Event field exactly matches one of the events specified by DOM3 Events in section 1.4.2 "Complete list of event types"</del> <ins class="diff-chg">also not a valid</ins> <a href= "http://www.w3.org/TR/REC-xml-names/#NT-NCName"><ins class= "diff-chg">NCName</ins></a> , <del class="diff-old">then</del> <ins class="diff-chg">set</ins> the <var title=""><ins class= "diff-new">data</ins></var> <ins class="diff-new">buffer and the</ins> <var title="">event <del class="diff-old">must be cancelable if</del> <ins class="diff-chg">name</ins></var> <ins class="diff-chg">buffer to</ins> the <del class= "diff-old">DOM3 Events specification specifies that it is,</del> <ins class="diff-chg">empty string</ins> and <del class= "diff-old">must not be cancelable otherwise. [DOM3EVENTS] For example: Event: load ...would cause Cancelable to be treated as No .</del> <ins class="diff-chg">abort these steps.</ins> </li> <li> Otherwise, <del class="diff-old">the</del> <ins class= "diff-chg">create an</ins> event <del class="diff-old">must be cancelable.</del> <ins class="diff-chg">that uses the</ins> <code><a href="#messageevent"><ins class= "diff-chg">MessageEvent</ins></a> <del class= "diff-old">Target</del></code> <del class="diff-old">field This field gives the node that</del> <ins class="diff-chg">interface, with</ins> the event <del class="diff-old">is to be dispatched on. If the object for</del> <ins class="diff-chg">name</ins> <code title="event-message"><a href="#message0"><ins class= "diff-chg">message</ins></a></code> , which <del class= "diff-old">the event source is being processed is</del> <ins class= "diff-chg">does</ins> not <del class="diff-old">a Node, but the Target field is nonetheless specified, then the event must be dropped. Otherwise, if field</del> <ins class= "diff-chg">bubble,</ins> is <del class="diff-old">specified</del> <ins class="diff-chg">cancelable,</ins> and <del class= "diff-old">its value starts with a #</del> <ins class= "diff-chg">has no default action. The</ins> <code title= "dom-MessageEvent-data"><a href="#data4"><ins class= "diff-chg">data</ins></a></code> <del class="diff-old">character, then</del> <ins class="diff-chg">attribute must be set to</ins> the <del class="diff-old">remainder</del> <ins class= "diff-chg">value</ins> of the <del class="diff-old">value represents an ID, and</del> <var title=""><ins class= "diff-chg">data</ins></var> <ins class="diff-chg">buffer,</ins> the <del class="diff-old">event</del> <code title= "dom-MessageEvent-origin"><a href="#origin1"><ins class= "diff-chg">origin</ins></a></code> <ins class= "diff-chg">attribute</ins> must be <del class="diff-old">dispatched on the same node as would be obtained by the getElementById() method on</del> <ins class="diff-chg">set to</ins> the <del class= "diff-old">ownerDocument</del> <a href="#origin0"><ins class= "diff-chg">origin</ins></a> of the <del class="diff-old">node whose</del> event <del class="diff-old">source is being processed. For example, Target: #test ...would target the element with ID test . Otherwise, if the field is specified and its value is</del> <ins class="diff-chg">stream's URI,</ins> the <del class= "diff-old">literal string " Document</del> <code title= "dom-MessageEvent-lastEventId"><a href="#lasteventid"><ins class= "diff-chg">lastEventId</ins></a></code> <del class="diff-old">", then the event</del> <ins class="diff-chg">attribute</ins> must be <del class="diff-old">dispatched at</del> <ins class="diff-chg">set to</ins> the <del class="diff-old">ownerDocument</del> <ins class="diff-chg">last event ID string</ins> of the <del class="diff-old">node whose</del> event <del class= "diff-old">source is being processed. Otherwise, the field (whether specified or not) is ignored</del> <ins class= "diff-chg">source,</ins> and the <del class="diff-old">event</del> <code title="dom-MessageEvent-source"><a href= "#source3"><ins class="diff-chg">source</ins></a></code> <ins class="diff-chg">attribute</ins> must be <del class= "diff-old">dispatched at the object itself.</del> <ins class= "diff-chg">set to null.</ins> </li> <li> <del class="diff-old">Other fields depend on the interface specified (or possibly implied) by the Class field.</del> If the <del class="diff-old">specified interface has an attribute that exactly matches the</del> <var title=""><ins class= "diff-chg">event</ins> name <del class="diff-old">of the field, and the</del></var> <ins class="diff-chg">buffer has a</ins> value <del class="diff-old">of</del> <ins class="diff-chg">other than</ins> the <del class="diff-old">field can be converted (using</del> <ins class="diff-chg">empty string, change</ins> the type <del class="diff-old">conversions defined in ECMAScript)</del> <ins class="diff-chg">of the newly created event</ins> to <ins class="diff-new">equal</ins> the <del class= "diff-old">type</del> <ins class="diff-chg">value</ins> of the <del class="diff-old">attribute, then it must be used. Any attributes (other than</del> <var title=""><ins class= "diff-chg">event name</ins></var> <ins class= "diff-chg">buffer.</ins> </li> <li> <ins class="diff-chg">Set</ins> the <del class="diff-old">Event interface attributes) that do not have matching fields are initialised</del> <var title=""><ins class= "diff-chg">data</ins></var> <ins class="diff-chg">buffer and the</ins> <var title=""><ins class="diff-chg">event name</ins></var> <ins class="diff-chg">buffer</ins> to <del class= "diff-old">zero, null, false, or</del> the empty string. </li> <li> <del class="diff-old">For example: Event: click Class: MouseEvent button: 2 ...would result in a 'click'</del> <ins class= "diff-chg">Dispatch the newly created</ins> event <del class= "diff-old">using</del> <ins class="diff-chg">at</ins> the <code><del class="diff-old">MouseEvent interface that has button set to 2</del> <a href="#remoteeventtarget0"><ins class= "diff-chg">RemoteEventTarget</ins></a></code> <del class= "diff-old">but screenX , screenY , etc, set</del> <ins class= "diff-chg">object</ins> to <del class="diff-old">0, false, or null as appropriate. If a field does not match any of the attributes on</del> <ins class="diff-chg">which</ins> the <del class= "diff-old">event, it must be ignored. For example: Event: keypress Class: MouseEvent keyIdentifier: 0 ...would result in a MouseEvent</del> event <del class="diff-old">with its fields all at their default values, with the</del> <ins class="diff-chg">stream is registered.</ins> </li> </ol> <ins class="diff-chg">If an</ins> event <del class= "diff-old">name being keypress . The keyIdentifier field would be ignored. (If the author had not included the Class field explicitly, it would have just worked, since the class would</del> <ins class="diff-chg">doesn't</ins> have <del class= "diff-old">defaulted as described above.) Once a blank line or the end of the file is reached,</del> an <ins class="diff-new">"id" field, but an earlier</ins> event <del class="diff-old">of the type and namespace given by the Event and Namespace fields respectively must be synthesized and dispatched to the appropriate node as described by</del> <ins class="diff-chg">did set</ins> the <del class="diff-old">fields above. No</del> event <del class= "diff-old">must be dispatched until a blank line has been received or the end of the file reached. The</del> <ins class= "diff-chg">source's</ins> <ins class="diff-chg">last</ins> event <del class="diff-old">must be dispatched as if using the DOM dispatchEvent() method. Thus, if</del> <ins class="diff-chg">ID string</ins> ,<ins class="diff-chg">then</ins> the <del class="diff-old">Event</del> <ins class= "diff-chg">event's</ins> <code title= "dom-MessageEvent-lastEventId"><a href="#lasteventid"><ins class= "diff-chg">lastEventId</ins></a></code> field <del class= "diff-old">was omitted, leaving the name as the empty string, or if the name had invalid characters, then</del> <ins class= "diff-chg">will be set to</ins> the <del class= "diff-old">dispatching</del> <ins class="diff-chg">value</ins> of <ins class="diff-new">whatever</ins> the <del class= "diff-old">event fails. Events fired from event sources do not have user-agent default actions.</del> <ins class="diff-chg">last seen "id" field was.</ins> <div class="example"> The following event stream, once followed by a blank line: <pre> data: YHOO data: -2 data: 10 </pre> ...would cause an event <code title="event-message"><a href= "#message0">message</a></code> with the interface <code><a href= "#messageevent">MessageEvent</a></code> to be dispatched on the <code><a href="#event-source">event-source</a></code> element, <del class="diff-old">which would then bubble up the DOM, and</del> whose <code title="dom-MessageEvent-data"><a href= "#data4">data</a></code> attribute would contain the string <code>YHOO\n-2\n10</code> (where <code>\n</code> <del class= "diff-old">again</del> represents a newline). This could be used as follows: <pre> <event-source src="http://stocks.example.com/ticker.php" onmessage="var data = event.data.split('\n'); updateStocks(data[0], data[1], data[2]);"> </pre> ...where <code title="">updateStocks()</code> is a function defined as: <pre> function updateStocks(symbol, delta, value) { ... } </pre> ...or some such. </div> <div class="example"> The following stream contains four <del class="diff-old">blocks and therefore fires four events.</del> <ins class= "diff-chg">blocks.</ins> The first block has just a comment, and will fire <del class="diff-old">a message event with all the fields set to the empty string or null.</del> <ins class= "diff-chg">nothing.</ins> The second block has two fields with names <del class="diff-old">"load"</del> <ins class= "diff-chg">"data"</ins> and <del class="diff-old">"Target"</del> <ins class="diff-chg">"id"</ins> respectively; <del class= "diff-old">since there is no " load " member on</del> <ins class= "diff-chg">an event will be fired for this block, with</ins> the <del class="diff-old">MessageEvent object that field is ignored, leaving</del> <ins class="diff-chg">data "first event", and will then set</ins> the <ins class="diff-new">last</ins> event <del class="diff-old">as</del> <ins class="diff-chg">ID to "1" so that if the connection died between this block and the next, the server would be sent</ins> a <del class="diff-old">second message</del> <code title=""><ins class= "diff-chg">Last-Event-ID</ins></code> <ins class="diff-new">header with the value "1". The third block fires an</ins> event with <del class="diff-old">all</del> <ins class="diff-chg">data "second event", and also has an "id" field, this time with no value, which resets</ins> the <del class="diff-old">fields set</del> <ins class= "diff-chg">last event ID</ins> to the empty string <del class= "diff-old">or null, but this time</del> <ins class= "diff-chg">(meaning no</ins> <code title=""><ins class= "diff-chg">Last-Event-ID</ins></code> <ins class="diff-chg">header will now be sent in</ins> the event <del class="diff-old">is targetted at</del> <ins class="diff-chg">of a reconnection being attempted). Finally the last block just fires</ins> an <del class= "diff-old">element</del> <ins class="diff-chg">event</ins> with <del class="diff-old">ID "image1". The third</del> <ins class= "diff-chg">the data "third event". Note that the last</ins> block <del class="diff-old">is empty (no lines between two</del> <ins class="diff-chg">doesn't have to end with a</ins> blank <del class="diff-old">lines), and</del> <ins class= "diff-chg">line,</ins> the <del class="diff-old">fourth block has only two comments, so they both yet again fire</del> <ins class= "diff-chg">end of the stream is enough to trigger the dispatch of the last event.</ins> <pre> : test stream <del class="diff-old">message </del> <ins class="diff-chg">data: first event id: 1 </ins> <del class="diff-old">events </del> <ins class="diff-chg">data: second event id data: third event </ins> </pre></div> <div class="example"> <ins class="diff-chg">The following stream fires just one event:</ins> <pre> data<ins class="diff-chg"> data data data: </ins> </pre> <ins class="diff-chg">The first and last blocks do nothing, since they do not contain any actual data (the</ins> <var title= ""><ins class="diff-chg">data</ins></var> <ins class= "diff-chg">buffer remains at the empty string, and so nothing gets dispatched). The middle block fires an event</ins> with <del class= "diff-old">all</del> the <del class="diff-old">fields</del> <ins class="diff-chg">data</ins> set to <del class="diff-old">the empty string or null.</del> <ins class="diff-chg">a single newline character.</ins> <del class="diff-old">; test load Target: #image1</del></div> <div class="example"> <ins class="diff-chg">The following stream fires two identical events:</ins> <pre> data:test <del class= "diff-old">; if any more events follow this block, they will not be affected by ; the "Target" and "load" fields above. </del> <ins class="diff-chg">data: test </ins> </pre> <ins class="diff-new">This is because the space after the colon is ignored if present.</ins> </div> <h4 id="notes"><del class= "diff-old">6.2.5.</del> <ins class="diff-chg">6.2.5</ins> Notes</h4> Legacy proxy servers are known to, in certain cases, drop HTTP connections after a short timeout. To protect against such proxy servers, authors can include a comment line (one starting with a <del class="diff-old">';'</del> <ins class="diff-chg">':'</ins> character) every 15 seconds or so. Authors wishing to relate event source connections to each other or to specific documents previously served might find that relying on IP addresses doesn't work, as individual clients can have multiple IP addresses (due to having multiple proxy servers) and individual IP addresses can have multiple clients (due to sharing a proxy server). It is better to include a unique identifier in the document when it is served and then pass that identifier as part of the URI in the <code title="attr-event-source-src"><a href= "#src11">src</a></code> attribute of the <code><a href= "#event-source">event-source</a></code> element. Implementations that support HTTP's per-server connection limitation might run into trouble when opening multiple pages from a site if each page has an <code><a href= "#event-source">event-source</a></code> to the same domain. Authors can avoid this using the relatively complex mechanism of using unique domain names per connection, or by allowing the user to enable or disable the <code><a href= "#event-source">event-source</a></code> functionality on a per-page basis. <h3 id="network"><del class= "diff-old">6.3.</del> <ins class="diff-chg">6.3</ins> Network connections</h3> To enable Web applications to communicate with each other in local area networks, and to maintain bidirectional communications with their originating server, this specification introduces the <code><a href="#connection0">Connection</a></code> interface. The <code><a href="#window">Window</a></code> interface provides three constructors for creating <code><a href= "#connection0">Connection</a></code> objects: <code title= "dom-TCPConnection"><a href= "#tcpconnection">TCPConnection()</a></code> , for creating a direct (possibly encrypted) link to another node on the Internet using TCP/IP; <code title="dom-LocalBroadcastConnection"><a href= "#localbroadcastconnection">LocalBroadcastConnection()</a></code> , for creating a connection to any listening peer on a local network (which could be a local TCP/IP subnet using UDP, a Bluetooth PAN, or another kind of network infrastructure); and <code title= "dom-PeerToPeerConnection"><a href= "#peertopeerconnection">PeerToPeerConnection()</a></code> , for a direct peer-to-peer connection (which could again be over TCP/IP, Bluetooth, IrDA, or some other type of network). This interface does not allow for raw access to the underlying network. For example, this interface could not be used to implement an IRC client without proxying messages through a custom server. <h4 id="network-intro"><del class= "diff-old">6.3.1.</del> <ins class="diff-chg">6.3.1</ins> Introduction</h4> This section is non-normative. An introduction to the client-side and server-side of using the direct connection APIs. An example of a party-line implementation of a broadcast service, and direct peer-to-peer chat for direct local connections. <h4 id="the-connection"><del class= "diff-old">6.3.2.</del> <ins class="diff-chg">6.3.2</ins> The <code><a href="#connection0">Connection</a></code> interface</h4> <pre class="idl"> interface <dfn id="connection0">Connection</dfn> { readonly attribute DOMString <a href="#network1" title= "dom-Connection-network">network</a>; readonly attribute DOMString <a href="#peer" title= "dom-Connection-peer">peer</a>; <del class="diff-old"> readonly attribute int ; </del> <ins class="diff-chg"> readonly attribute int <a href= "#readystate1" title="dom-Connection-readyState">readyState</a>; </ins> attribute EventListener <a href="#onopen" title= "dom-Connection-onopen">onopen</a>; attribute EventListener <a href="#onread" title= "dom-Connection-onread">onread</a>; attribute EventListener <a href="#onclose" title= "dom-Connection-onclose">onclose</a>; void <a href="#send" title= "dom-Connection-send">send</a>(in DOMString data); void <a href="#disconnect" title= "dom-Connection-disconnect">disconnect</a>(); }; </pre> <code><a href="#connection0">Connection</a></code> objects must also implement the <code>EventTarget</code> interface. <a href= "#references">[DOM3EVENTS]</a> When a <code><a href="#connection0">Connection</a></code> object is created, the UA must try to establish a connection, as described in the sections below describing each connection type. The <dfn id="network1" title= "dom-Connection-network"><code>network</code></dfn> attribute represents the name of the network connection (the value depends on the kind of connection being established). The <dfn id="peer" title="dom-Connection-peer"><code>peer</code></dfn> attribute identifies the remote host for direct (non-broadcast) connections. The <code title="dom-Connection-network"><a href= "#network1">network</a></code> attribute must be set as soon as the <code><a href="#connection0">Connection</a></code> object is created, and keeps the same value for the lifetime of the object. The <code title="dom-Connection-peer"><a href= "#peer">peer</a></code> attribute must initially be set to the empty string and must be updated once, when the connection is established, after which point it must keep the same value for the lifetime of the object. The <dfn id="readystate1" title= "dom-Connection-readyState"><code>readyState</code></dfn> attribute represents the state of the connection. When the object is created it must be set to 0. It can have the following values: <dl> <dt>0 Connecting</dt> <dd>The connection has not yet been established.</dd> <dt>1 Connected</dt> <dd>The connection is established and communication is possible.</dd> <dt>2 Closed</dt> <dd>The connection has been closed.</dd> </dl> Once a connection is established, the <code title="dom-Connection-readyState"><a href= "#readystate1">readyState</a></code> attribute's value must be changed to 1, and the <code title="event-connection-open"><a href= "#open3">open</a></code> event must be fired on the <code><a href= "#connection0">Connection</a></code> object. When data is received, the <code title= "event-connection-read"><a href="#read">read</a></code> event will be fired on the <code><a href="#connection0">Connection</a></code> object. When the connection is closed, the <code title="dom-Connection-readyState"><a href= "#readystate1">readyState</a></code> attribute's value must be changed to 2, and the <code title="event-connection-close"><a href= "#close0">close</a></code> event must be fired on the <code><a href="#connection0">Connection</a></code> object. The <dfn id="onopen" title= "dom-Connection-onopen"><code>onopen</code></dfn> , <dfn id= "onread" title="dom-Connection-onread"><code>onread</code></dfn> , and <dfn id="onclose" title= "dom-Connection-onclose"><code>onclose</code></dfn> attributes must, when set, register their new value as an event listener for their respective events (namely <code title= "event-connection-open"><a href="#open3">open</a></code> , <code title="event-connection-read"><a href="#read">read</a></code> , and <code title="event-connection-close"><a href= "#close0">close</a></code> ), and unregister their previous value if any. The <dfn id="send" title= "dom-Connection-send"><code>send()</code></dfn> method transmits data using the connection. If the connection is not yet established, it must raise an <code>INVALID_STATE_ERR</code> exception. If the connection is established, then the <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> depends on the connection type, as described below. The <dfn id="disconnect" title= "dom-Connection-disconnect"><code>disconnect()</code></dfn> method must close the connection, if it is open. If the connection is already closed, it must do nothing. Closing the connection causes a <code title="event-connection-close"><a href= "#close0">close</a></code> event to be fired and the <code title= "dom-Connection-readyState"><a href= "#readystate1">readyState</a></code> attribute's value to change, as <a href="#closeConnection">described above</a> . <h4 id="connection"><del class= "diff-old">6.3.3.</del> <ins class="diff-chg">6.3.3</ins> Connection Events</h4> All the events described in this section are events in no namespace, which do not bubble, are not cancelable, and have no default action. The <dfn id="open3" title= "event-connection-open"><code>open</code></dfn> event is fired when the connection is established. UAs must use the normal <code>Event</code> interface when firing this event. The <dfn id="close0" title= "event-connection-close"><code>close</code></dfn> event is fired when the connection is closed (whether by the author, calling the <code title="dom-Connection-disconnect"><a href= "#disconnect">disconnect()</a></code> method, or by the server, or by a network error). UAs must use the normal <code>Event</code> interface when firing this event as well. No information regarding why the connection was closed is passed to the application in this version of this specification. The <dfn id="read" title= "event-connection-read"><code>read</code></dfn> event is fired when when data is received for a connection. UAs must use the <code><a href="#connectionreadevent">ConnectionReadEvent</a></code> interface for this event. <pre class="idl"> interface <dfn id= "connectionreadevent">ConnectionReadEvent</dfn> : Event { readonly attribute DOMString <a href="#data5" title= "dom-ConnectionReadEvent-data">data</a>; <del class="diff-old"> readonly attribute DOMString ; </del> <ins class="diff-chg"> readonly attribute DOMString <a href= "#source4" title="dom-ConnectionReadEvent-source">source</a>; </ins> void <a href="#initconnectionreadevent" title= "dom-ConnectionReadEvent-initConnectionReadEvent">initConnectionReadEvent</a>(in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMString dataArg); void <a href="#initconnectionreadeventns" title= "dom-ConnectionReadEvent-initConnectionReadEventNS">initConnectionReadEventNS</a>(in DOMString namespaceURI, in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in DOMString dataArg); }; </pre> The <dfn id="initconnectionreadevent" title= "dom-ConnectionReadEvent-initConnectionReadEvent"><code>initConnectionReadEvent()</code></dfn> and <dfn id="initconnectionreadeventns" title= "dom-ConnectionReadEvent-initConnectionReadEventNS"><code>initConnectionReadEventNS()</code></dfn> methods must initialise the event in a manner analogous to the similarly-named methods in the DOM3 Events interfaces. <a href= "#references">[DOM3EVENTS]</a> The <dfn id="data5" title= "dom-ConnectionReadEvent-data"><code>data</code></dfn> attribute represents the data that was transmitted from the peer. The <dfn id="source4" title= "dom-ConnectionReadEvent-source"><code>source</code></dfn> attribute represents the name of the peer. This is primarily useful on broadcast connections; on direct connections it is equal to the <code title="dom-Connection-peer"><a href="#peer">peer</a></code> attribute on the <code><a href="#connection0">Connection</a></code> object. Events that would be fired during script execution (e.g. between the connection object being created — and thus the connection being established — and the current script completing; or, during the execution of a <code title="event-connection-read"><a href= "#read">read</a></code> event handler) must be buffered, and those events queued up and each one individually fired after the script has completed. <h4 id="tcp-connections"><del class= "diff-old">6.3.4.</del> <ins class="diff-chg">6.3.4</ins> TCP connections</h4> The <dfn id="tcpconnection" title= "dom-TCPConnection"><code>TCPConnection( <var title= "">subdomain</var> , <var title="">port</var> , <var title= "">secure</var> )</code></dfn> constructor on the <code><a href= "#window">Window</a></code> interface returns a new object implementing the <code><a href="#connection0">Connection</a></code> interface, set up for a direct connection to a specified host on the page's domain. When this constructor is invoked, the following steps must be followed. First, if the <del class="diff-old">domain</del> <ins class= "diff-chg">host</ins> part of the script's <a href= "#origin0">origin</a> is not a host name (e.g. it is an IP address) then the UA must raise a <a href="#security9">security exception</a> . We currently don't allow connections to be set up back to an originating IP address, but we could, if the subdomain is the empty string. Then, if the <var title="">subdomain</var> argument is null or the empty string, the target host is the <del class= "diff-old">domain</del> <ins class="diff-chg">host</ins> part of the script's <a href="#origin0">origin</a> . Otherwise, the <var title="">subdomain</var> argument is prepended to the <del class="diff-old">domain</del> <ins class="diff-chg">host</ins> part of the script's <a href="#origin0">origin</a> with a dot separating the two strings, and that is the target host. If either: <ul> <li>the target host is not a valid host name, or</li> <li>the <var title="">port</var> argument is neither equal to 80, nor equal to 443, nor greater than or equal to 1024 and less than or equal to 65535,</li> </ul> ...then the UA must raise a <a href="#security9">security exception</a> . Otherwise, the user agent must verify that the <a href= "#the-string0">the string representing the script's domain in IDNA format</a> can be obtained without errors. If it cannot, then the user agent must raise a <a href="#security9">security exception</a> . The user agent may also raise a <a href="#security9">security exception</a> at this time if, for some reason, permission to create a direct TCP connection to the relevant host is denied. Reasons could include the UA being instructed by the user to not allow direct connections, or the UA establishing (for instance using UPnP) that the network topology will cause connections on the specified port to be directed at the wrong host. If no exceptions are raised by the previous steps, then a new <code><a href="#connection0">Connection</a></code> object must be created, its <code title="dom-Connection-peer"><a href= "#peer">peer</a></code> attribute must be set to a string consisting of the name of the target host, a colon (U+003A COLON), and the port number as decimal digits, and its <code title= "dom-Connection-network"><a href="#network1">network</a></code> attribute must be set to the same value as the <code title= "dom-Connection-peer"><a href="#peer">peer</a></code> attribute. This object must then be returned. The user agent must then begin trying to establish a connection with the target host and specified port. (This typically would begin in the <del class="diff-old">backgound,</del> <ins class= "diff-chg">background,</ins> while the script continues to execute.) If the <var title="">secure</var> boolean argument is set to true, then the user agent must establish a secure connection with the target host and specified port using TLS or another protocol, negotiated with the server. <a href="#references">[RFC2246]</a> If this fails the user agent must act as if it had <a href= "#closeConnection">closed the connection</a> . Once a secure connection is established, or if the <var title= "">secure</var> boolean argument is not set to true, then the user agent must continue to connect to the server using the protocol described in the section entitled <a href="#clients0">clients connecting over TCP</a> . All data on connections made using TLS must be sent as "application data". Once the connection is established, the UA must act as described in the section entitled <a href="#sending0">sending and receiving data over TCP</a> . User agents should allow multiple TCP connections to be established per host. In particular, user agents should not apply per-host HTTP connection limits to connections established with the <code title="dom-TCPConnection"><a href= "#tcpconnection">TCPConnection</a></code> constructor. <h4 id="broadcast"><del class= "diff-old">6.3.5.</del> <ins class="diff-chg">6.3.5</ins> Broadcast connections</h4> The <dfn id="localbroadcastconnection" title= "dom-LocalBroadcastConnection"><code>LocalBroadcastConnection()</code></dfn> constructor on the <code><a href="#window">Window</a></code> interface returns a new object implementing the <code><a href= "#connection0">Connection</a></code> interface, set up to broadcast on the local network. When this constructor is invoked, a new <code><a href= "#connection0">Connection</a></code> object must be created. The <code title="dom-Connection-network"><a href= "#network1">network</a></code> attribute of the object must be set to <a href="#the-string0">the string representing the script's domain in IDNA format</a> . If this string cannot be obtained, then the user agent must raise a <a href="#security9">security exception</a> exception when the constructor is called. The <code title="dom-Connection-peer"><a href= "#peer">peer</a></code> attribute must be set to the empty string. The object must then be returned, unless, for some reason, permission to broadcast on the local network is to be denied. In the latter case, a <a href="#security9">security exception</a> must be raised instead. User agents may deny such permission for any reason, for example a user preference. If the object is returned (i.e. if no exception is raised), the user agent must the begin broadcasting and listening on the local network, in the background, as described below. The user agent may define "the local network" in any way it considers appropriate and safe; for instance the user agent may ask the user which network (e.g. Bluetooth, IrDA, Ethernet, etc) the user would like to broadcast on before beginning broadcasting. UAs may broadcast and listen on multiple networks at once. For example, the UA could broadcast on both Bluetooth and Wifi at the same time. As soon as the object is returned, the connection <a href= "#openConnection">has been established</a> , which implies that the <code title="event-connection-open"><a href= "#open3">open</a></code> event must be fired. Broadcast connections are never closed. <h5 id="broadcasting">6.3.5.1. Broadcasting over TCP/IP</h5> Should we drop this altogether? Letting people fill the local network with garbage seems unwise. We need to register a UDP port for this. For now this spec refers to port 18080/udp. Since this feature requires that the user agent listen to a particular port, some platforms might prevent more than one user agent per IP address from using this feature at any one time. On TCP/IP networks, broadcast connections transmit data using UDP over port 18080. When the <code title="dom-Connection-send"><a href="#send">send( <var title="">data</var> )</a></code> method is invoked on a <code><a href="#connection0">Connection</a></code> object that was created by the <code title="dom-LocalBroadcastConnection"><a href= "#localbroadcastconnection">LocalBroadcastConnection()</a></code> constructor, the user agent must follow these steps: <ol> <li>Create a string consisting of the value of the <code title= "dom-Connection-network"><a href="#network1">network</a></code> attribute of the <code><a href="#connection0">Connection</a></code> object, a U+0020 SPACE character, a U+0002 START OF TEXT character, and the <var title="">data</var> argument.</li> <li>Encode the string as UTF-8.</li> <li>If the resulting byte stream is longer than 65487 bytes, raise an <code>INDEX_SIZE_ERR</code> DOM exception and stop.</li> <li>Create a UDP packet whose data is the byte stream, with the source and destination ports being 18080, and with appropriate length and checksum fields. Transmit this packet to IPv4 address 255.255.255.255 or IPv6 address ff02::1, as appropriate. IPv6 applications will also have to enable reception from this address.</li> </ol> When a broadcast connection is opened on a TCP/IP network, the user agent should listen for UDP packets on port 18080. When the user agent receives a packet on port 18080, the user agent must attempt to decode that packet's data as UTF-8. If the data is not fully correct UTF-8 (i.e. if there are decoding errors) then the packet must be ignored. Otherwise, the user agent must check to see if the decoded string contains a U+0020 SPACE character. If it does not, then the packet must again be ignored (it might be a peer discovery packet from a <code title= "dom-PeerToPeerConnection"><a href= "#peertopeerconnection">PeerToPeerConnection()</a></code> constructor). If it does then the user agent must split the string at the first space character. All the characters before the space are then known as <var title="">d</var> , and all the characters after the space are known as <var title="">s</var> . If <var title= "">s</var> is not at least one character long, or if the first character of <var title="">s</var> is not a U+0002 START OF TEXT character, then the packet must be ignored. (This allows for future extension of this protocol.) Otherwise, for each <code><a href= "#connection0">Connection</a></code> object that was created by the <code title="dom-LocalBroadcastConnection"><a href= "#localbroadcastconnection">LocalBroadcastConnection()</a></code> constructor and whose <code title="dom-Connection-network"><a href= "#network1">network</a></code> attribute exactly matches <var title="">d</var> , a <code title= "event-connection-read"><a href="#read">read</a></code> event must be fired on the <code><a href="#connection0">Connection</a></code> object. The string <var title="">s</var> , with the first character removed, must be used as the <code title= "dom-ConnectionReadEvent-data"><a href="#data5">data</a></code> , and the source IP address of the packet as the <code title= "dom-ConnectionReadEvent-source"><a href= "#source4">source</a></code> . Making the source IP available means that if two or more machines in a private network can be made to go to a hostile page simultaneously, the hostile page can determine the IP addresses used locally (i.e. on the other side of any NAT router). Is there some way we can keep link-local IP addresses secret while still allowing for applications to distinguish between multiple participants? <h5 id="bluetooth-broadcast">6.3.5.2. Broadcasting over Bluetooth</h5> Does anyone know enough about Bluetooth to write this section? <h5 id="irda-broadcast">6.3.5.3. Broadcasting over IrDA</h5> Does anyone know enough about IrDA to write this section? <h4 id="peer-to-peer"><del class= "diff-old">6.3.6.</del> <ins class="diff-chg">6.3.6</ins> Peer-to-peer connections</h4> The <dfn id="peertopeerconnection" title= "dom-PeerToPeerConnection"><code>PeerToPeerConnection()</code></dfn> constructor on the <code><a href="#window">Window</a></code> interface returns a new object implementing the <code><a href= "#connection0">Connection</a></code> interface, set up for a direct connection to a user-specified host. When this constructor is invoked, a new <code><a href= "#connection0">Connection</a></code> object must be created. The <code title="dom-Connection-network"><a href= "#network1">network</a></code> attribute of the object must be set to <a href="#the-string0">the string representing the script's domain in IDNA format</a> . If this string cannot be obtained, then the user agent must raise a <a href="#security9">security exception</a> exception when the constructor is called. The <code title="dom-Connection-peer"><a href= "#peer">peer</a></code> attribute must be set to the empty string. The object must then be returned, unless, for some reason, permission to establish peer-to-peer connections is generally disallowed, for example due to administrator settings. In the latter case, a <a href="#security9">security exception</a> must be raised instead. The user agent must then, typically while the script resumes execution, find a remote host to establish a connection to. To do this it must start broadcasting and listening for peer discovery messages and listening for incoming connection requests on all the supported networks. How this is performed depends on the type of network and is described below. The UA should inform the user of the clients that are detected, and allow the user to select one to connect to. UAs may also allow users to explicit specify hosts that were not detected, e.g. by having the user enter an IP address. If an incoming connection is detected before the user specifies a target host, the user agent should ask the user to confirm that this is the host they wish to connect to. If it is, the connection should be accepted and the UA will act as the server in this connection. (Which UA acts as the server and which acts as the client is not discernible at the DOM API level.) If no incoming connection is detected and if the user specifies a particular target host, a connection should be established to that host, with the UA acting as the client in the connection. No more than one connection must be established per <code><a href="#connection0">Connection</a></code> object, so once a connection has been established, the user agent must stop listening for further connections (unless, or until such time as, another <code><a href="#connection0">Connection</a></code> object is being created). If at any point the user cancels the connection process or the remote host refuses the connection, then the user agent must act as if it had <a href="#closeConnection">closed the connection</a> , and stop trying to connect. <h5 id="peer-to-peer0">6.3.6.1. Peer-to-peer connections over TCP/IP</h5> Should we replace this section with something that uses Rendez-vous/zeroconf or equivalent? We need to register ports for this. For now this spec refers to port 18080/udp and 18080/tcp. Since this feature requires that the user agent listen to a particular port, some platforms might prevent more than one user agent per IP address from using this feature at any one time. When using TCP/IP, broadcasting peer discovery messages must be done by creating UDP packets every few seconds containing as their data the value of the connection's <code title= "dom-Connection-network"><a href="#network1">network</a></code> attribute, encoded as UTF-8, with the source and destination ports being set to 18080 and appropriate length and checksum fields, and sending these packets to address (in IPv4) 255.255.255.255 or (in IPv6) ff02::1, as appropriate. Listening for peer discovery messages must be done by examining incoming UDP packets on port 18080. IPv6 applications will also have to enable reception from the ff02::1 address. If their payload is exactly byte-for-byte equal to a UTF-8 encoded version of the value of the connection's <code title="dom-Connection-network"><a href= "#network1">network</a></code> attribute, then the source address of that packet represents the address of a host that is ready to accept a peer-to-peer connection, and it should therefore be offered to the user. Incoming connection requests must be listened for on TCP port 18080. If an incoming connection is received, the UA must act as a server , as described in the section entitled <a href= "#servers0">servers accepting connections over TCP</a> . If no incoming connection requests are accepted and the user instead specifies a target host to connect to, the UA acts as a client : the user agent must attempt to connect to the user-specified host on port 18080, as described in the section entitled <a href="#clients0">clients connecting over TCP</a> . Once the connection is established, the UA must act as described in the section entitled <a href="#sending0">sending and receiving data over TCP</a> . This specification does not include a way to establish secure (encrypted) peer-to-peer connections at this time. If you can see a good way to do this, let me know. <h5 id="bluetooth-peer">6.3.6.2. Peer-to-peer connections over Bluetooth</h5> Does anyone know enough about Bluetooth to write this section? <h5 id="irda-peer">6.3.6.3. Peer-to-peer connections over IrDA</h5> Does anyone know enough about IrDA to write this section? <h4 id="the-common"><del class= "diff-old">6.3.7.</del> <ins class="diff-chg">6.3.7</ins> The common protocol for TCP-based connections</h4> The same protocol is used for <code title= "dom-TCPConnection"><a href= "#tcpconnection">TCPConnection</a></code> and <code title= "dom-PeerToPeerConnection"><a href= "#peertopeerconnection">PeerToPeerConnection</a></code> connection types. This section describes how such connections are established from the client and server sides, and then describes how data is sent and received over such connections (which is the same for both clients and servers). <h5 id="clients">6.3.7.1. <dfn id= "clients0">Clients connecting over TCP</dfn></h5> This section defines the client-side requirements of the protocol used by the <code title="dom-TCPConnection"><a href= "#tcpconnection">TCPConnection</a></code> and <code title= "dom-PeerToPeerConnection"><a href= "#peertopeerconnection">PeerToPeerConnection</a></code> connection types. If a TCP connection to the specified target host and port cannot be established, for example because the target host is a domain name that cannot be resolved to an IP address, or because packets cannot be routed to the host, the user agent should retry creating the connection. If the user agent gives up trying to connect, the user agent must act as if it had <a href="#closeConnection">closed the connection</a> . No information regarding the state of the connection is passed to the application while the connection is being established in this version of this specification. Once a TCP/IP connection to the remote host is established, the user agent must transmit the following sequence of bytes, represented here in hexadecimal form: <pre> 0x48 0x65 0x6C 0x6C 0x6F 0x0A </pre> This represents the string "Hello" followed by a newline, encoded in UTF-8. The user agent must then read all the bytes sent from the remote host, up to the first 0x0A byte (inclusive). That string of bytes is then compared byte-for-byte to the following string of bytes: <pre> 0x57 0x65 0x6C 0x63 0x6F 0x6E 0x65 0x0A </pre> This says "Welcome". If the server sent back a string in any way different to this, then the user agent must <a href="#closeConnection">close the connection</a> and give up trying to connect. Otherwise, the user agent must then take <a href= "#the-string0">the string representing the script's domain in IDNA format</a> , encode it as UTF-8, and send that to the remote host, followed by a 0x0A byte (a U+000A LINE FEED in UTF-8). The user agent must then read all the bytes sent from the remote host, up to the first 0x0A byte (inclusive). That string of bytes must then be compared byte-for-byte to the string that was just sent to the server (the one with the IDNA domain name and ending with a newline character). If the server sent back a string in any way different to this, then the user agent must <a href= "#closeConnection">close the connection</a> and give up trying to connect. Otherwise, the connection <a href="#openConnection">has been established</a> (and events and so forth get fired, as described above). If at any point during this process the connection is closed prematurely, then the user agent must <a href= "#closeConnection">close the connection</a> and give up trying to connect. <h5 id="servers">6.3.7.2. <dfn id= "servers0">Servers accepting connections over TCP</dfn></h5> This section defines the server side of the protocol described in the previous section. For authors, it should be used as a guide for how to implement servers that can communicate with Web pages over TCP. For UAs these are the requirements for the server part of <code title="dom-PeerToPeerConnection"><a href= "#peertopeerconnection">PeerToPeerConnection</a></code> s. Once a TCP/IP connection from a remote host is established, the user agent must transmit the following sequence of bytes, represented here in hexadecimal form: <pre> 0x57 0x65 0x6C 0x63 0x6F 0x6E 0x65 0x0A </pre> This says "Welcome" and a newline in UTF-8. The user agent must then read all the bytes sent from the remote host, up to the first 0x0A byte (inclusive). That string of bytes is then compared byte-for-byte to the following string of bytes: <pre> 0x48 0x65 0x6C 0x6C 0x6F 0x0A </pre> "Hello" and a newline. If the remote host sent back a string in any way different to this, then the user agent must <a href="#closeConnection">close the connection</a> and give up trying to connect. Otherwise, the user agent must then take <a href= "#the-string0">the string representing the script's domain in IDNA format</a> , encode it as UTF-8, and send that to the remote host, followed by a 0x0A byte (a U+000A LINE FEED in UTF-8). The user agent must then read all the bytes sent from the remote host, up to the first 0x0A byte (inclusive). That string of bytes must then be compared byte-for-byte to the string that was just sent to that host (the one with the IDNA domain name and ending with a newline character). If the remote host sent back a string in any way different to this, then the user agent must <a href= "#closeConnection">close the connection</a> and give up trying to connect. Otherwise, the connection <a href="#openConnection">has been established</a> (and events and so forth get fired, as described above). For author-written servers (as opposed to the server side of a peer-to-peer connection), the script's domain would be replaced by the hostname of the server. Alternatively, such servers might instead wait for the client to send its domain string, and then simply echo it back. This would allow connections from pages on any domain, instead of just pages originating from the same host. The client compares the two strings to ensure they are the same before allowing the connection to be used by author script. If at any point during this process the connection is closed prematurely, then the user agent must <a href= "#closeConnection">close the connection</a> and give up trying to connect. <h5 id="sending">6.3.7.3. <dfn id= "sending0">Sending and receiving data over TCP</dfn></h5> When the <code title="dom-Connection-send"><a href="#send">send( <var title="">data</var> )</a></code> method is invoked on the connection's corresponding <code><a href= "#connection0">Connection</a></code> object, the user agent must take the <var title="">data</var> argument, replace any U+0000 NULL and U+0017 END OF TRANSMISSION BLOCK characters in it with U+FFFD REPLACEMENT CHARACTER characters, then transmit a U+0002 START OF TEXT character, this new <var title="">data</var> string and a single U+0017 END OF TRANSMISSION BLOCK character (in that order) to the remote host, all encoded as UTF-8. When the user agent receives bytes on the connection, the user agent must buffer received bytes until it receives a 0x17 byte (a U+0017 END OF TRANSMISSION BLOCK character). If the first buffered byte is not a 0x02 byte (a U+0002 START OF TEXT character encoded as UTF-8) then all the data up to the 0x17 byte, inclusive, must be dropped. (This allows for future extension of this protocol.) Otherwise, all the data from (but not including) the 0x02 byte and up to (but not including) the 0x17 byte must be taken, interpreted as a UTF-8 string, and a <code title= "event-connection-read"><a href="#read">read</a></code> event must be fired on the <code><a href="#connection0">Connection</a></code> object with that string as the <code title= "dom-ConnectionReadEvent-data"><a href="#data5">data</a></code> . If that string cannot be decoded as UTF-8 without errors, the packet should be ignored. This protocol does not yet allow binary data (e.g. an image or <a href="#media9">media data</a> ) to be efficiently transmitted. A future version of this protocol might allow this by using the prefix character U+001F INFORMATION SEPARATOR ONE, followed by binary data which uses a particular byte (e.g. 0xFF) to encode byte 0x17 somehow (since otherwise 0x17 would be treated as transmission end by down-level UAs). <h4 id="network-security"><del class= "diff-old">6.3.8.</del> <ins class="diff-chg">6.3.8</ins> Security</h4> Need to write this section. If you have an unencrypted page that is (through a man-in-the-middle attack) changed, it can access a secure service that is using IP authentication and then send that data back to the attacker. Ergo we should probably stop unencrypted pages from accessing encrypted services, on the principle that the actual level of security is zero. Then again, if we do that, we prevent insecure sites from using SSL as a tunneling mechanism. Should consider dropping the subdomain-only restriction. It doesn't seem to add anything, and prevents cross-domain chatter. <h4 id="network-other-specs"><del class= "diff-old">6.3.9.</del> <ins class="diff-chg">6.3.9</ins> Relationship to other standards</h4> Should have a section talking about the fact that we blithely ignoring IANA's port assignments here. Should explain why we are not reusing HTTP for this. (HTTP is too heavy-weight for such a simple need; requiring authors to implement an HTTP server just to have a party line is too much of a barrier to entry; cannot rely on prebuilt components; having a simple protocol makes it much easier to do RAD; HTTP doesn't fit the needs and doesn't have the security model needed; etc) <h3 id="crossDocumentMessages"><del class= "diff-old">6.4.</del> <ins class="diff-chg">6.4</ins> <dfn id="cross-document">Cross-document messaging</dfn></h3> Web browsers, for security and privacy reasons, prevent documents in different domains from affecting each other; that is, cross-site scripting is disallowed. While this is an important security feature, it prevents pages from different domains from communicating even when those pages are not hostile. This section introduces a messaging system that allows documents to communicate with each other regardless of their source domain, in a way designed to not enable cross-site scripting attacks. <h4 id="processing4"><del class= "diff-old">6.4.1.</del> <ins class="diff-chg">6.4.1</ins> Processing model</h4> When a script invokes the <dfn id="postmessage" title= "dom-window-postMessage"><code>postMessage( <var title= "">message</var> , <var title=""><ins class= "diff-new">targetOrigin</ins></var> )</code></dfn> method on a <code><a href="#window">Window</a></code> object, the user agent must <del class="diff-old">create</del> <ins class= "diff-chg">follow these steps:</ins> <ol> <li> <ins class="diff-chg">If the value of the</ins> <var title= ""><ins class="diff-chg">targetOrigin</ins></var> <ins class= "diff-chg">argument is neither a single U+002A ASTERISK character ("*") nor a valid URI or IRI, then throw a</ins> <code><ins class= "diff-chg">SYNTAX_ERR</ins></code> <ins class="diff-chg">exception and abort the overall set of steps.</ins> <a href= "#references"><ins class="diff-chg">[RFC3986]</ins></a> <a href= "#references"><ins class="diff-chg">[RFC3987]</ins></a> </li> <li> <ins class="diff-chg">Return from the</ins> <code title= "dom-window-postMessage"><a href="#postmessage"><ins class= "diff-chg">postMessage()</ins></a></code> <ins class= "diff-chg">method, but asynchronously continue running these steps.</ins> </li> <li> <ins class="diff-chg">Wait for the</ins> <code><a href= "#window"><ins class="diff-chg">Window</ins></a></code> <ins class= "diff-chg">object on which the method was invoked to have finished executing any pending scripts.</ins> </li> <li> <ins class="diff-chg">If the</ins> <var title=""><ins class= "diff-chg">targetOrigin</ins></var> <ins class="diff-chg">argument has a value other than a single literal U+002A ASTERISK character ("*"), and the</ins> <a href="#active"><ins class="diff-chg">active document</ins></a> <ins class="diff-chg">of the</ins> <code><a href="#window"><ins class= "diff-chg">Window</ins></a></code> <ins class="diff-chg">object on which the method was invoked does not have the</ins> <a href= "#same-origin"><ins class="diff-chg">same origin</ins></a> <ins class="diff-chg">as</ins> <var title=""><ins class= "diff-chg">targetOrigin</ins></var> ,<ins class="diff-chg">then abort these steps silently.</ins> </li> <li> <ins class="diff-chg">Create</ins> an event that uses the <code><a href="#messageevent">MessageEvent</a></code> interface, with the event name <code title="event-message"><a href= "#message0">message</a></code> , which <del class= "diff-old">bubbles,</del> <ins class="diff-chg">does not bubble,</ins> is cancelable, and has no default action. The <code title="dom-MessageEvent-data"><a href= "#data4">data</a></code> attribute must be set to the value passed as the <var title="">message</var> argument to the <code title= "dom-window-postMessage"><a href= "#postmessage">postMessage()</a></code> method, the <code title= "dom-MessageEvent-origin"><del class="diff-old">domain</del> <a href="#origin1"><ins class="diff-chg">origin</ins></a></code> attribute must be set to the <del class="diff-old">domain</del> <a href="#serialization0" title= "serialization of an origin"><ins class= "diff-chg">serialization</ins></a> of the <del class= "diff-old">document</del> <a href="#origin0"><ins class= "diff-chg">origin</ins></a> <del class="diff-old">that</del> <ins class="diff-chg">of</ins> the script that invoked the <del class="diff-old">methods is associated with,</del> <ins class= "diff-chg">method,</ins> the <code title= "dom-MessageEvent-lastEventId"><del class="diff-old">uri</del> <a href="#lasteventid"><ins class= "diff-chg">lastEventId</ins></a></code> attribute must be set to the <del class="diff-old">URI of that document,</del> <ins class= "diff-chg">empty string,</ins> and the <code title= "dom-MessageEvent-source"><a href="#source3">source</a></code> attribute must be set to the <code><a href= "#window">Window</a></code> object of the <a href= "#default3">default view</a> of the <a href="#browsing1">browsing context <del class="diff-old">with</del></a> <ins class= "diff-chg">for</ins> which <del class="diff-old">that document is associated. Define 'domain' more exactly -- IDN vs no IDN, absence of ports, effect of window.document.domain on its value, etc The event must then be dispatched at</del> the <code>Document</code> object <del class="diff-old">that</del> <ins class="diff-chg">with which the script is associated</ins> is the <a href= "#active">active document</a> <del class="diff-old">of</del> <ins class="diff-chg">.</ins> </li> <li> <ins class="diff-chg">Dispatch the event created in the previous step at</ins> the <code><a href="#window">Window</a></code> object on which the method was invoked. <del class="diff-old">The postMessage() method must only return once the event dispatch has been completely processed by the target document (i.e. all three of the capture, target, and bubble phases have been done, and event listeners have been executed as appropriate).</del> </li> </ol> Authors should check the <code title= "dom-MessageEvent-origin"><del class="diff-old">domain</del> <a href="#origin1"><ins class="diff-chg">origin</ins></a></code> attribute to ensure that messages are only accepted from domains that they expect to receive messages from. Otherwise, bugs in the author's message handling code could be exploited by hostile sites. <ins class="diff-new">Authors should not use the wildcard keyword ("*") in the</ins> <var title=""><ins class= "diff-new">targetOrigin</ins></var> <ins class="diff-new">argument in messages that contain any confidential information, as otherwise there is no way to guarantee that the message is only delivered to the recipient to which it was intended.</ins> <div class="example"> For example, if document A contains an <code><a href= "#object">object</a></code> element that contains document B, and script in document A calls <code title= "dom-window-postMessage"><a href= "#postmessage">postMessage()</a></code> on document B, then a message event will be fired on that element, marked as originating from document A. The script in document A might look like: <pre> var o = document.getElementsByTagName('object')[0]; <del class="diff-old">o.('Hello world'); </del> <ins class="diff-chg">o.contentWindow.postMessage('Hello world', 'http://b.example.org/'); </ins> </pre> To register an event handler for incoming events, the script would use <code title="">addEventListener()</code> (or similar mechanisms). For example, the script in document B might look like: <pre> document.addEventListener('message', receiver, false); function receiver(e) { <del class="diff-old"> if (e.domain == 'example.com') { </del> <ins class="diff-chg"> if (e.origin == 'http://example.com') { </ins> if (e.data == 'Hello world') { <del class="diff-old"> e.source.postMessage('Hello'); </del> <ins class= "diff-chg"> e.source.postMessage('Hello', e.origin); </ins> } else { alert(e.data); } } } </pre> This script first checks the domain is the expected domain, and then looks at the message, which it either displays to the user, or responds to by sending a message back to the document which sent the message in the first place. </div> The integrity of this API is based on the inability for scripts of one <a href="#origin0">origin</a> to post arbitrary events (using <code title="">dispatchEvent()</code> or otherwise) to objects in other <del class="diff-old">origins.</del> <ins class="diff-chg">origins (those that are not the</ins> <a href="#same-origin" title="same origin"><ins class= "diff-chg">same</ins></a> <ins class="diff-chg">).</ins> Implementors are urged to take extra care in the implementation of this feature. It allows authors to transmit information from one domain to another domain, which is normally disallowed for security reasons. It also requires that UAs be careful to allow access to certain properties but not others. <h2 id="repetition">7. Repetition templates</h2> See <a href= "http://www.whatwg.org/specs/web-forms/current-work/#repeatingFormControls"> WF2</a> for now <h2 id="syntax">8. The HTML syntax</h2> <h3 id="writing0"><del class= "diff-old">8.1.</del> <ins class="diff-chg">8.1</ins> Writing HTML documents</h3> This section only applies to documents, authoring tools, and markup generators. In particular, it does not apply to conformance checkers; conformance checkers must use the requirements given in the next section ("parsing HTML documents"). Documents must consist of the following parts, in the given order: <ol> <li>Optionally, a single U+FEFF BYTE ORDER MARK (BOM) character.</li> <li>Any number of <a href="#comments0" title= "syntax-comments">comments</a> and <a href="#space" title= "space character">space characters</a> .</li> <li>A <a href="#doctype" title="syntax-doctype">DOCTYPE</a> .</li> <li>Any number of <a href="#comments0" title= "syntax-comments">comments</a> and <a href="#space" title= "space character">space characters</a> .</li> <li>The root element, in the form of an <code><a href= "#html">html</a></code> <a href="#elements3" title= "syntax-elements">element</a> .</li> <li>Any number of <a href="#comments0" title= "syntax-comments">comments</a> and <a href="#space" title= "space character">space characters</a> .</li> </ol> The various types of content mentioned above are described in the next few sections. In addition, there are some restrictions on how character encoding declarations are to be <del class= "diff-old">serialised,</del> <ins class= "diff-chg">serialized,</ins> as discussed in the section on that topic. <div class="note"> <del class="diff-old">The U+0000 NULL character must not appear anywhere in a document.</del> Space characters before the root <code><a href="#html">html</a></code> <ins class= "diff-new">element, and space characters at the start of the</ins> <code><a href="#html"><ins class="diff-new">html</ins></a></code> element <ins class="diff-new">and before the</ins> <code><a href= "#head"><ins class="diff-new">head</ins></a></code> <ins class= "diff-new">element,</ins> will be dropped when the document is parsed; space characters after the root <code><a href= "#html">html</a></code> element will be parsed as if they were at the end of the <code><del class="diff-old">html</del> <a href= "#body0"><ins class="diff-chg">body</ins></a></code> element. Thus, space characters around the root element do not round-trip. It is suggested that newlines be inserted after the <del class= "diff-old">DOCTYPE and</del> <ins class="diff-chg">DOCTYPE, after</ins> any comments that <del class="diff-old">aren't in</del> <ins class="diff-chg">are before</ins> the root <ins class= "diff-new">element, after the</ins> <code><a href= "#html"><ins class="diff-new">html</ins></a></code> <ins class= "diff-new">element's start tag (if it is not</ins> <a href= "#omitted" title="syntax-tag-omission"><ins class= "diff-new">omitted</ins></a> <ins class="diff-new">), and after any comments that are inside the</ins> <code><a href= "#html"><ins class="diff-new">html</ins></a></code> <ins class= "diff-new">element but before the</ins> <code><a href= "#head"><ins class="diff-new">head</ins></a></code> element. </div> <h4 id="the-doctype"><del class= "diff-old">8.1.1.</del> <ins class="diff-chg">8.1.1</ins> The DOCTYPE</h4> A <dfn id="doctype" title="syntax-doctype">DOCTYPE</dfn> is a mostly useless, but required, header. DOCTYPEs are required for legacy reasons. When omitted, browsers tend to use a different rendering mode that is incompatible with some specifications. Including the DOCTYPE in a document ensures that the browser makes a best-effort attempt at following the relevant specifications. A DOCTYPE must consist of the following characters, in this order: <ol class="brief"> <li>A U+003C LESS-THAN SIGN ( <code><</code> ) character.</li> <li>A U+0021 EXCLAMATION MARK ( <code>!</code> ) character.</li> <li>A U+0044 LATIN CAPITAL LETTER D or U+0064 LATIN SMALL LETTER D character.</li> <li>A U+004F LATIN CAPITAL LETTER O or U+006F LATIN SMALL LETTER O character.</li> <li>A U+0043 LATIN CAPITAL LETTER C or U+0063 LATIN SMALL LETTER C character.</li> <li>A U+0054 LATIN CAPITAL LETTER T or U+0074 LATIN SMALL LETTER T character.</li> <li>A U+0059 LATIN CAPITAL LETTER Y or U+0079 LATIN SMALL LETTER Y character.</li> <li>A U+0050 LATIN CAPITAL LETTER P or U+0070 LATIN SMALL LETTER P character.</li> <li>A U+0045 LATIN CAPITAL LETTER E or U+0065 LATIN SMALL LETTER E character.</li> <li>One or more <a href="#space" title="space character">space characters</a> .</li> <li>A U+0048 LATIN CAPITAL LETTER H or U+0068 LATIN SMALL LETTER H character.</li> <li>A U+0054 LATIN CAPITAL LETTER T or U+0074 LATIN SMALL LETTER T character.</li> <li>A U+004D LATIN CAPITAL LETTER M or U+006D LATIN SMALL LETTER M character.</li> <li>A U+004C LATIN CAPITAL LETTER L or U+006C LATIN SMALL LETTER L character.</li> <li>Zero or more <a href="#space" title="space character">space characters</a> .</li> <li>A U+003E GREATER-THAN SIGN ( <code>></code> ) character.</li> </ol> In other words, <code><!DOCTYPE HTML></code> , case-insensitively. <h4 id="elements0"><del class= "diff-old">8.1.2.</del> <ins class="diff-chg">8.1.2</ins> Elements</h4> There are <del class="diff-old">four</del> <ins class= "diff-chg">five</ins> different kinds of <dfn id="elements3" title= "syntax-elements">elements</dfn> : void elements, CDATA elements, RCDATA elements, <ins class="diff-new">foreign elements,</ins> and normal elements. <dl> <dt><dfn id="void-elements">Void elements</dfn></dt> <dd><code><a href="#base">base</a></code> , <code><a href= "#link">link</a></code> , <code><a href="#meta0">meta</a></code> , <code><a href="#hr">hr</a></code> , <code><a href= "#br">br</a></code> , <code><a href="#img">img</a></code> , <code><a href="#embed">embed</a></code> , <code><a href= "#param">param</a></code> , <code><a href="#area">area</a></code> , <code><a href="#col">col</a></code> , <code>input</code></dd> <dt>CDATA elements</dt> <dd><code><a href="#style1">style</a></code> , <code><a href= "#script1">script</a></code></dd> <dt>RCDATA elements</dt> <dd><code><a href="#title1">title</a></code> , <code>textarea</code></dd> <dt><ins class="diff-new">Foreign elements</ins></dt> <dd><ins class="diff-new">Elements from the</ins> <a href= "#mathml0"><ins class="diff-new">MathML namespace</ins></a></dd> <dt>Normal elements</dt> <dd>All other allowed <a href="#html-elements">HTML elements</a> are normal elements.</dd> </dl> <dfn id="tags" title="syntax-tags">Tags</dfn> are used to delimit the start and end of elements in the markup. CDATA, RCDATA, and normal elements have a <a href="#start6" title= "syntax-start-tags">start tag</a> to indicate where they begin, and an <a href="#end-tags0" title="syntax-end-tags">end tag</a> to indicate where they end. The start and end tags of certain normal elements can be <a href="#omitted" title= "syntax-tag-omission">omitted</a> , as described later. Those that cannot be omitted must not be omitted. Void elements only have a start tag; end tags must not be specified for void elements. <ins class="diff-new">Foreign elements must either have a start tag and an end tag, or a start tag that is marked as self-closing, in which case they must not have an end tag.</ins> The contents of the element must be placed between just after the start tag (which <a href="#omitted" title= "syntax-tag-omission">might be implied, in certain cases</a> ) and just before the end tag (which again, <a href="#omitted" title= "syntax-tag-omission">might be implied in certain cases</a> ). The exact allowed contents of each individual element depends on the content model of that element, as described earlier in this specification. Elements must not contain content that their content model disallows. In addition to the restrictions placed on the contents by those content models, however, the <del class= "diff-old">four</del> <ins class="diff-chg">five</ins> types of elements have additional syntactic requirements. Void elements can't have any contents (since there's no end tag, no content can be put between the start tag and the end <del class= "diff-old">tag.)</del> <ins class="diff-chg">tag).</ins> CDATA elements can have <a href="#text2" title= "syntax-text">text</a> , though it has <a href= "#cdata-rcdata-restrictions">restrictions</a> described below. RCDATA elements can have <a href="#text2" title= "syntax-text">text</a> and <a href="#character3" title= "syntax-charref">character <del class="diff-old">entity</del> references</a> , but the text must not contain an <a href= "#ambiguous" title="syntax-ambiguous-ampersand">ambiguous ampersand</a> . There are also <a href= "#cdata-rcdata-restrictions">further restrictions</a> described below. <ins class="diff-new">Foreign elements whose start tag is marked as self-closing can't have any contents (since, again, as there's no end tag, no content can be put between the start tag and the end tag). Foreign elements whose start tag is</ins> <ins class= "diff-new">not</ins> <ins class="diff-new">marked as self-closing can have</ins> <a href="#text2" title= "syntax-text"><ins class="diff-new">text</ins></a> ,<a href= "#character3" title="syntax-charref"><ins class= "diff-new">character references</ins></a> ,<a href="#cdata0" title= "syntax-cdata"><ins class="diff-new">CDATA blocks</ins></a> ,<ins class="diff-new">other</ins> <a href="#elements3" title= "syntax-elements"><ins class="diff-new">elements</ins></a> ,<ins class="diff-new">and</ins> <a href="#comments0" title= "syntax-comments"><ins class="diff-new">comments</ins></a> ,<ins class="diff-new">but the text must not contain the character U+003C LESS-THAN SIGN (</ins> <code><ins class= "diff-new"><</ins></code> <ins class="diff-new">) or an</ins> <a href="#ambiguous" title="syntax-ambiguous-ampersand"><ins class= "diff-new">ambiguous ampersand</ins></a> . Normal elements can have <a href="#text2" title= "syntax-text">text</a> , <a href="#character3" title= "syntax-charref">character <del class="diff-old">entity</del> references</a> , other <a href="#elements3" title= "syntax-elements">elements</a> , and <a href="#comments0" title= "syntax-comments">comments</a> , but the text must not contain the character U+003C LESS-THAN SIGN ( <code><</code> ) or an <a href="#ambiguous" title="syntax-ambiguous-ampersand">ambiguous ampersand</a> . Some normal elements also have <a href= "#element-restrictions">yet more restrictions</a> on what content they are allowed to hold, beyond the restrictions imposed by the content model and those described in this paragraph. Those restrictions are described below. Tags contain a <dfn id="tag-name" title="syntax-tag-name">tag name</dfn> , giving the element's name. HTML elements all have names that only use characters in the range <ins class= "diff-new">U+0030 DIGIT ZERO .. U+0039 DIGIT NINE,</ins> U+0061 LATIN SMALL LETTER A .. U+007A LATIN SMALL LETTER Z, <del class= "diff-old">or, in uppercase,</del> U+0041 LATIN CAPITAL LETTER A .. U+005A LATIN CAPITAL LETTER Z, and U+002D HYPHEN-MINUS ( <code>-</code> ). In the HTML syntax, tag names may be written with any mix of lower- and uppercase letters that, when converted to all-lowercase, matches the element's tag name; tag names are case-insensitive. <h5 id="start">8.1.2.1. Start tags</h5> <dfn id="start6" title="syntax-start-tags">Start tags</dfn> must have the following format: <ol> <li>The first character of a start tag must be a U+003C LESS-THAN SIGN ( <code><</code> ).</li> <li>The next few characters of a start tag must be the element's <a href="#tag-name" title="syntax-tag-name">tag name</a> .</li> <li>If there are to be any attributes in the next step, there must first be one or more <a href="#space" title="space character">space characters</a> .</li> <li>Then, the start tag may have a number of attributes, the <a href="#attributes2" title="syntax-attributes">syntax for which</a> is described below. Attributes may be separated from each other by one or more <a href="#space" title="space character">space characters</a> .</li> <li>After the attributes, there may be one or more <a href="#space" title="space character">space characters</a> . (Some attributes are required to be followed by a space. See the <a href="#attributes2" title="syntax-attributes">attributes section</a> below.)</li> <li>Then, if the element is one of the void elements, <ins class= "diff-new">or if the element is a foreign element,</ins> then there may be a single U+002F SOLIDUS ( <code>/</code> ) character. This character has no effect <del class="diff-old">except to appease</del> <ins class="diff-chg">on void elements, but on foreign elements it marks</ins> the <del class="diff-old">markup gods. As this character is therefore just a symbol of faith, atheists should omit it.</del> <ins class="diff-chg">start tag as self-closing.</ins></li> <li>Finally, start tags must be closed by a U+003E GREATER-THAN SIGN ( <code>></code> ) character.</li> </ol> <h5 id="end-tags">8.1.2.2. End tags</h5> <dfn id="end-tags0" title="syntax-end-tags">End tags</dfn> must have the following format: <ol> <li>The first character of an end tag must be a U+003C LESS-THAN SIGN ( <code><</code> ).</li> <li>The second character of an end tag must be a U+002F SOLIDUS ( <code>/</code> ).</li> <li>The next few characters of an end tag must be the element's <a href="#tag-name" title="syntax-tag-name">tag name</a> .</li> <li>After the tag name, there may be one or more <a href="#space" title="space character">space characters</a> .</li> <li>Finally, end tags must be closed by a U+003E GREATER-THAN SIGN ( <code>></code> ) character.</li> </ol> <h5 id="attributes1">8.1.2.3. Attributes</h5> <dfn id="attributes2" title="syntax-attributes">Attributes</dfn> for an element are expressed inside the element's start tag. Attributes have a name and a value. <dfn id="attribute" title= "syntax-attribute-name">Attribute names</dfn> must consist of one <del class="diff-old">character other than the space characters , U+003E GREATER-THAN SIGN (>), and U+002F SOLIDUS (/), followed by zero</del> or more characters other than the <a href="#space" title="space character">space characters</a> , <ins class= "diff-new">U+0000 NULL, U+0022 QUOTATION MARK ("), U+0027 APOSTROPHE ('),</ins> U+003E GREATER-THAN SIGN (>), U+002F SOLIDUS (/), and U+003D EQUALS SIGN <del class= "diff-old">(=).</del> <ins class="diff-chg">(=) characters, the control characters, and any characters that are not defined by Unicode.</ins> In the HTML syntax, attribute names may be written with any mix of lower- and uppercase letters that, when converted to all-lowercase, matches the attribute's name; attribute names are case-insensitive. <dfn id="attribute0" title="syntax-attribute-value">Attribute values</dfn> are a mixture of <a href="#text2" title= "syntax-text">text</a> and <a href="#character3" title= "syntax-charref">character <del class="diff-old">entity</del> references</a> , except with the additional restriction that the text cannot contain an <a href="#ambiguous" title= "syntax-ambiguous-ampersand">ambiguous ampersand</a> . Attributes can be specified in four different ways: <dl> <dt>Empty attribute syntax</dt> <dd> Just the <a href="#attribute" title= "syntax-attribute-name">attribute name</a> . <div class="example"> In the following example, the <code title= "attr-input-disabled">disabled</code> attribute is given with the empty attribute syntax: <pre> <input  disabled  > </pre></div> If an attribute using the empty attribute syntax is to be followed by another attribute, then there must be a <a href= "#space">space character</a> separating the two. </dd> <dt>Unquoted attribute value syntax</dt> <dd> The <a href="#attribute" title="syntax-attribute-name">attribute name</a> , followed by zero or more <a href="#space" title= "space character">space characters</a> , followed by a single U+003D EQUALS SIGN character, followed by zero or more <a href= "#space" title="space character">space characters</a> , followed by the <a href="#attribute0" title="syntax-attribute-value">attribute value</a> , which, in addition to the requirements given above for attribute values, must not contain any literal <a href="#space" title="space character">space characters <del class="diff-old">or U+003E GREATER-THAN SIGN ( > ) characters, and must not, furthermore, start with either</del></a> , a <del class= "diff-old">literal</del> U+0022 QUOTATION MARK ( <code>"</code> ) <del class="diff-old">character or a literal</del> <ins class= "diff-chg">characters,</ins> U+0027 APOSTROPHE ( <code>'</code> ) <del class="diff-old">character.</del> <ins class= "diff-chg">characters, U+003D EQUALS SIGN (</ins> <code><ins class= "diff-chg">=</ins></code> <ins class="diff-chg">) characters, or U+003E GREATER-THAN SIGN (</ins> <code><ins class= "diff-chg">></ins></code> <ins class="diff-chg">) characters.</ins> <div class="example"> In the following example, the <code title= "attr-input-value">value</code> attribute is given with the unquoted attribute value syntax: <pre> <input  value=yes  > </pre></div> If an attribute using the unquoted attribute syntax is to be followed by another attribute or by one of the optional U+002F SOLIDUS ( <code>/</code> ) characters allowed in step 6 of the start tag syntax above, then there must be a <a href="#space">space character</a> separating the two. </dd> <dt>Single-quoted attribute value syntax</dt> <dd> The <a href="#attribute" title="syntax-attribute-name">attribute name</a> , followed by zero or more <a href="#space" title= "space character">space characters</a> , followed by a single U+003D EQUALS SIGN character, followed by zero or more <a href= "#space" title="space character">space characters</a> , followed by a single U+0027 APOSTROPHE ( <code>'</code> ) character, followed by the <a href="#attribute0" title= "syntax-attribute-value">attribute value</a> , which, in addition to the requirements given above for attribute values, must not contain any literal U+0027 APOSTROPHE ( <code>'</code> ) characters, and finally followed by a second single U+0027 APOSTROPHE ( <code>'</code> ) character. <div class="example"> In the following example, the <code title= "attr-input-type">type</code> attribute is given with the single-quoted attribute value syntax: <pre> <input  type='checkbox'  > </pre></div> <ins class="diff-new">If an attribute using the single-quoted attribute syntax is to be followed by another attribute, then there must be a</ins> <a href="#space"><ins class="diff-new">space character</ins></a> <ins class="diff-new">separating the two.</ins> </dd> <dt>Double-quoted attribute value syntax</dt> <dd> The <a href="#attribute" title="syntax-attribute-name">attribute name</a> , followed by zero or more <a href="#space" title= "space character">space characters</a> , followed by a single U+003D EQUALS SIGN character, followed by zero or more <a href= "#space" title="space character">space characters</a> , followed by a single U+0022 QUOTATION MARK ( <code>"</code> ) character, followed by the <a href="#attribute0" title= "syntax-attribute-value">attribute value</a> , which, in addition to the requirements given above for attribute values, must not contain any literal U+0022 QUOTATION MARK ( <code>"</code> ) characters, and finally followed by a second single U+0022 QUOTATION MARK ( <code>"</code> ) character. <div class="example"> In the following example, the <code title= "attr-input-name">name</code> attribute is given with the double-quoted attribute value syntax: <pre> <input  name="be evil"  > </pre></div> <ins class="diff-new">If an attribute using the double-quoted attribute syntax is to be followed by another attribute, then there must be a</ins> <a href="#space"><ins class="diff-new">space character</ins></a> <ins class="diff-new">separating the two.</ins> </dd> </dl> <h5 id="optional">8.1.2.4. Optional tags</h5> Certain tags can be <dfn id="omitted" title= "syntax-tag-omission">omitted</dfn> . An <code><a href="#html">html</a></code> element's start tag may be omitted if the first thing inside the <code><a href="#html">html</a></code> element is not a <del class="diff-old">space character or a</del> <a href= "#comments0" title="syntax-comments">comment</a> . An <code><a href="#html">html</a></code> element's end tag may be omitted if the <code><a href="#html">html</a></code> element is not immediately followed <del class="diff-old">by a space character or</del> a <a href="#comments0" title="syntax-comments">comment <del class= "diff-old">.</del></a> <ins class="diff-chg">and the element contains a</ins> <code><a href="#body0"><ins class= "diff-chg">body</ins></a></code> <ins class="diff-chg">element that is either not empty or whose</ins> <ins class="diff-chg">start tag</ins> <ins class="diff-chg">has not been omitted.</ins> A <code><a href="#head">head</a></code> element's start tag may be omitted if the first thing inside the <code><a href="#head">head</a></code> element is an element. A <code><a href="#head">head</a></code> element's end tag may be omitted if the <code><a href="#head">head</a></code> element is not immediately followed by a <a href="#space">space character</a> or a <a href= "#comments0" title="syntax-comments">comment</a> . A <code><a href="#body0">body</a></code> element's start tag may be omitted if the first thing inside the <code><a href="#body0">body</a></code> element is not a <a href="#space">space character</a> or a <a href= "#comments0" title="syntax-comments">comment</a> , except if the first thing inside the <code><a href="#body0">body</a></code> element is a <code><a href="#script1">script</a></code> or <code><a href="#style1">style</a></code> <del class= "diff-old">element .</del> <ins class="diff-chg">element.</ins> A <code><a href="#body0">body</a></code> element's end tag may be omitted if the <code><a href="#body0">body</a></code> element is not immediately followed by a <del class="diff-old">space character or a</del> <a href="#comments0" title="syntax-comments">comment <del class= "diff-old">.</del></a> <ins class="diff-chg">and the element is either not empty or its</ins> <ins class="diff-chg">start tag</ins> <ins class="diff-chg">has not been omitted.</ins> A <code><a href="#li">li</a></code> element's end tag may be omitted if the <code><a href="#li">li</a></code> element is immediately followed by another <code><a href="#li">li</a></code> element or if there is no more content in the parent element. A <code><a href="#dt">dt</a></code> element's end tag may be omitted if the <code><a href="#dt">dt</a></code> element is immediately followed by another <code><a href="#dt">dt</a></code> element or a <code><a href="#dd">dd</a></code> element. A <code><a href="#dd">dd</a></code> element's end tag may be omitted if the <code><a href="#dd">dd</a></code> element is immediately followed by another <code><a href="#dd">dd</a></code> element or a <code><a href="#dt">dt</a></code> element, or if there is no more content in the parent element. A <code><a href="#p">p</a></code> element's end tag may be omitted if the <code><a href="#p">p</a></code> element is immediately followed by an <code><a href="#address">address</a></code> , <code><a href= "#blockquote">blockquote</a></code> , <code><a href= "#dl">dl</a></code> , <code>fieldset</code> , <code>form</code> , <code><a href="#h1">h1</a></code> , <code><a href= "#h2">h2</a></code> , <code><a href="#h3">h3</a></code> , <code><a href="#h4">h4</a></code> , <code><a href= "#h5">h5</a></code> , <code><a href="#h6">h6</a></code> , <code><a href="#hr">hr</a></code> , <code><a href= "#menu">menu</a></code> , <code><a href="#ol">ol</a></code> , <code><a href="#p">p</a></code> , <code><a href= "#pre">pre</a></code> , <code><a href="#table">table</a></code> , or <code><a href="#ul">ul</a></code> element, or if there is no more content in the parent element. An <code>optgroup</code> element's end tag may be omitted if the <code>optgroup</code> element is immediately followed by another <code>optgroup</code> element, or if there is no more content in the parent element. An <code>option</code> element's end tag may be omitted if the <code>option</code> element is immediately followed by another <code>option</code> element, or if there is no more content in the parent element. A <code><a href="#colgroup">colgroup</a></code> element's start tag may be omitted if the first thing inside the <code><a href= "#colgroup">colgroup</a></code> element is a <code><a href= "#col">col</a></code> element, and if the element is not immediately preceded by another <code><a href= "#colgroup">colgroup</a></code> element whose end tag has been omitted. A <code><a href="#colgroup">colgroup</a></code> element's end tag may be omitted if the <code><a href="#colgroup">colgroup</a></code> element is not immediately followed by a <a href="#space">space character</a> or a <a href="#comments0" title="syntax-comments">comment</a> . A <code><a href="#thead0">thead</a></code> element's end tag may be omitted if the <code><a href="#thead0">thead</a></code> element is immediately followed by a <code><a href="#tbody">tbody</a></code> or <code><a href="#tfoot0">tfoot</a></code> element. A <code><a href="#tbody">tbody</a></code> element's start tag may be omitted if the first thing inside the <code><a href="#tbody">tbody</a></code> element is a <code><a href="#tr">tr</a></code> element, and if the element is not immediately preceded by a <code><a href= "#tbody">tbody</a></code> , <code><a href= "#thead0">thead</a></code> , or <code><a href= "#tfoot0">tfoot</a></code> element whose end tag has been omitted. A <code><a href="#tbody">tbody</a></code> element's end tag may be omitted if the <code><a href="#tbody">tbody</a></code> element is immediately followed by a <code><a href="#tbody">tbody</a></code> or <code><a href="#tfoot0">tfoot</a></code> element, or if there is no more content in the parent element. A <code><a href="#tfoot0">tfoot</a></code> element's end tag may be omitted if the <code><a href="#tfoot0">tfoot</a></code> element is immediately followed by a <code><a href="#tbody">tbody</a></code> element, or if there is no more content in the parent element. A <code><a href="#tr">tr</a></code> element's end tag may be omitted if the <code><a href="#tr">tr</a></code> element is immediately followed by another <code><a href="#tr">tr</a></code> element, or if there is no more content in the parent element. A <code><a href="#td">td</a></code> element's end tag may be omitted if the <code><a href="#td">td</a></code> element is immediately followed by a <code><a href="#td">td</a></code> or <code><a href= "#th">th</a></code> element, or if there is no more content in the parent element. A <code><a href="#th">th</a></code> element's end tag may be omitted if the <code><a href="#th">th</a></code> element is immediately followed by a <code><a href="#td">td</a></code> or <code><a href= "#th">th</a></code> element, or if there is no more content in the parent element. However , a start tag must never be omitted if it has any attributes. <h5 id="element-restrictions">8.1.2.5. Restrictions on content models</h5> For historical reasons, certain elements have extra restrictions beyond even the restrictions given by their content model. <del class="diff-old">A p element must not contain blockquote , dl , menu , ol , pre , table , or ul elements, even though these elements are technically allowed inside p elements according to the content models described in this specification. (In fact, if one of those elements is put inside a p element in the markup, it will instead imply a p element end tag before it.)</del> An <code>optgroup</code> element must not contain <code>optgroup</code> elements, even though these elements are technically allowed to be nested according to the content models described in this specification. (If an <code>optgroup</code> element is put inside another in the markup, it will in fact imply an <code>optgroup</code> end tag before it.) A <code><a href="#table">table</a></code> element must not contain <code><a href="#tr">tr</a></code> elements, even though these elements are technically allowed inside <code><a href= "#table">table</a></code> elements according to the content models described in this specification. (If a <code><a href= "#tr">tr</a></code> element is put inside a <code><a href= "#table">table</a></code> in the markup, it will in fact imply a <code><a href="#tbody">tbody</a></code> start tag before it.) A single U+000A LINE FEED (LF) character may be placed immediately after the start tag of <code><a href="#pre">pre</a></code> and <code>textarea</code> elements. This does not affect the processing of the element. The otherwise optional U+000A LINE FEED (LF) character must be included if the element's contents start with that character (because otherwise the leading newline in the contents would be treated like the optional newline, and ignored). <div class="example"> The following two <code><a href="#pre">pre</a></code> blocks are equivalent: <pre> <pre> Hello</pre> </pre> <pre> <pre>   Hello</pre> </pre></div> <h5 id="cdata-rcdata-restrictions">8.1.2.6. Restrictions on the contents of CDATA and RCDATA elements</h5> The text in CDATA and RCDATA elements must not contain any <del class="diff-old">occurences</del> <ins class= "diff-chg">occurrences</ins> of the string " <code title= ""></</code> " (U+003C LESS-THAN SIGN, U+002F SOLIDUS) followed by characters that case-insensitively match the tag name of the element followed by one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), U+0020 SPACE, U+003E GREATER-THAN SIGN (> ), or U+002F SOLIDUS (/), unless that string is part of an <a href="#escaping" title= "syntax-escape">escaping text span</a> . An <dfn id="escaping" title="syntax-escape">escaping text span</dfn> is a span of <a href="#text2" title= "syntax-text">text</a> <del class="diff-old">(in CDATA and RCDATA elements) and character entity references (in RCDATA elements)</del> that starts with an <a href="#escaping0" title= "syntax-escape-start">escaping text span start</a> that is not itself in an <a href="#escaping" title="syntax-escape">escaping text span</a> , and ends at the next <a href="#escaping1" title= "syntax-escape-end">escaping text span end</a> . <ins class= "diff-new">There cannot be any</ins> <a href="#character3" title= "syntax-charref"><ins class="diff-new">character references</ins></a> <ins class="diff-new">inside an</ins> <a href= "#escaping" title="syntax-escape"><ins class="diff-new">escaping text span</ins></a> . An <dfn id="escaping0" title="syntax-escape-start">escaping text span start</dfn> is a part of <a href="#text2" title= "syntax-text">text</a> that consists of the four character sequence " <code title=""><!--</code> " (U+003C LESS-THAN SIGN, U+0021 EXCLAMATION MARK, U+002D HYPHEN-MINUS, U+002D HYPHEN-MINUS). An <dfn id="escaping1" title="syntax-escape-end">escaping text span end</dfn> is a part of <a href="#text2" title= "syntax-text">text</a> that consists of the three character sequence " <code title="">--></code> " (U+002D HYPHEN-MINUS, U+002D HYPHEN-MINUS, U+003E GREATER-THAN SIGN) whose U+003E GREATER-THAN SIGN (>). An <a href="#escaping0" title="syntax-escape-start">escaping text span start</a> may share its U+002D HYPHEN-MINUS characters with its corresponding <a href="#escaping1" title= "syntax-escape-end">escaping text span end</a> . The text in CDATA and RCDATA elements must not have an <a href= "#escaping0" title="syntax-escape-start">escaping text span start</a> that is not followed by an <a href="#escaping1" title= "syntax-escape-end">escaping text span end</a> . <h4 id="text0"><del class= "diff-old">8.1.3.</del> <ins class="diff-chg">8.1.3</ins> Text</h4> <dfn id="text2" title="syntax-text">Text</dfn> is allowed inside elements, attributes, and comments. Text must consist of <del class="diff-old">valid</del> Unicode <del class= "diff-old">characters other than U+0000.</del> <ins class= "diff-chg">characters.</ins> Text <del class= "diff-old">should</del> <ins class="diff-chg">must not contain U+0000 characters. Text must not contain permanently undefined Unicode characters. Text must</ins> not contain control characters other than <a href="#space" title="space character">space characters</a> . Extra constraints are placed on what is and what is not allowed in text based on where the text is to be put, as described in the other sections. <h5 id="newlines">8.1.3.1. Newlines</h5> <dfn id="newlines0" title="syntax-newlines">Newlines</dfn> in HTML may be represented either as U+000D CARRIAGE RETURN (CR) characters, U+000A LINE FEED (LF) characters, or pairs of U+000D CARRIAGE RETURN (CR), U+000A LINE FEED (LF) characters in that order. <h4 id="character"><del class= "diff-old">8.1.4.</del> <ins class="diff-chg">8.1.4</ins> Character <del class="diff-old">entity</del> references</h4> In certain cases described in other sections, <a href="#text2" title="syntax-text">text</a> may be mixed with <dfn id="character3" title="syntax-charref">character <del class="diff-old">entity</del> references</dfn> . These can be used to escape characters that couldn't otherwise legally be included in <a href="#text2" title= "syntax-text">text</a> . Character <del class="diff-old">entity</del> references must start with a U+0026 AMPERSAND ( <code>&</code> ). Following this, there are three possible kinds of character <del class= "diff-old">entity</del> references: <dl> <dt>Named <del class="diff-old">entities</del> <ins class= "diff-chg">character references</ins></dt> <dd>The ampersand must be followed by one of the names given in the <del class="diff-old">entities</del> <a href="#named0"><ins class= "diff-chg">named character references</ins></a> section, using the same case. The name must be one that is terminated by a U+003B SEMICOLON ( <code title="">;</code> ) character.</dd> <dt>Decimal numeric <del class="diff-old">entities</del> <ins class="diff-chg">character reference</ins></dt> <dd>The ampersand must be followed by a U+0023 NUMBER SIGN ( <code>#</code> ) character, followed by one or more digits in the range U+0030 DIGIT ZERO .. U+0039 DIGIT NINE, representing a base-ten integer that itself is a <del class="diff-old">valid</del> Unicode code point that is not U+0000, U+000D, in the range U+0080 .. U+009F, or in the range 0xD800 .. 0xDFFF (surrogates). The digits must then be followed by a U+003B SEMICOLON character ( <code title="">;</code> ).</dd> <dt>Hexadecimal numeric <del class="diff-old">entities</del> <ins class="diff-chg">character reference</ins></dt> <dd>The ampersand must be followed by a U+0023 NUMBER SIGN ( <code>#</code> ) character, which must be followed by either a U+0078 LATIN SMALL LETTER X or a U+0058 LATIN CAPITAL LETTER X character, which must then be followed by one or more digits in the range U+0030 DIGIT ZERO .. U+0039 DIGIT NINE, U+0061 LATIN SMALL LETTER A .. U+0066 LATIN SMALL LETTER F, and U+0041 LATIN CAPITAL LETTER A .. U+0046 LATIN CAPITAL LETTER F, representing a base-sixteen integer that itself is a <del class= "diff-old">valid</del> Unicode code point that is not U+0000, U+000D, in the range U+0080 .. U+009F, or in the range 0xD800 .. 0xDFFF (surrogates). The digits must then be followed by a U+003B SEMICOLON character ( <code title="">;</code> ).</dd> </dl> An <dfn id="ambiguous" title= "syntax-ambiguous-ampersand">ambiguous ampersand</dfn> is a U+0026 AMPERSAND ( <code>&</code> ) character that is <del class= "diff-old">not the last character in the file, that is not</del> followed by <ins class="diff-new">some</ins> <a href="#text2" title="syntax-text"><ins class="diff-new">text</ins></a> <ins class="diff-new">other than</ins> a <a href="#space">space character</a> , <del class="diff-old">that is not followed by</del> a <del class="diff-old">start tag that has not been omitted, and that is not followed by</del> <ins class="diff-chg">U+003C LESS-THAN SIGN character ('<'), or</ins> another U+0026 AMPERSAND ( <code>&</code> ) character. <h4 id="cdata"><ins class= "diff-new">8.1.5</ins> <ins class="diff-new">CDATA blocks</ins></h4> <dfn id="cdata0" title="syntax-cdata"><ins class= "diff-new">CDATA blocks</ins></dfn> <ins class="diff-new">must start with the character sequence U+003C LESS-THAN SIGN, U+0021 EXCLAMATION MARK, U+005B LEFT SQUARE BRACKET, U+0043 LATIN CAPITAL LETTER C, U+0044 LATIN CAPITAL LETTER D, U+0041 LATIN CAPITAL LETTER A, U+0054 LATIN CAPITAL LETTER T, U+0041 LATIN CAPITAL LETTER A, U+005B LEFT SQUARE BRACKET (</ins> <code title= ""><ins class="diff-new"><![CDATA[</ins></code> <ins class= "diff-new">). Following this sequence, the block may have</ins> <a href="#text2" title="syntax-text"><ins class= "diff-new">text</ins></a> ,<ins class="diff-new">with the additional restriction that the text must not contain the three character sequence U+005D RIGHT SQUARE BRACKET, U+005D RIGHT SQUARE BRACKET, U+003E GREATER-THAN SIGN (</ins> <code title= ""><ins class="diff-new">]]></ins></code> <ins class= "diff-new">). Finally, the CDATA block must be ended by the three character sequence U+005D RIGHT SQUARE BRACKET, U+005D RIGHT SQUARE BRACKET, U+003E GREATER-THAN SIGN (</ins> <code title= ""><ins class="diff-new">]]></ins></code> <ins class= "diff-new">).</ins> <h4 id="comments"><del class= "diff-old">8.1.5.</del> <ins class="diff-chg">8.1.6</ins> Comments</h4> <dfn id="comments0" title="syntax-comments">Comments</dfn> must start with the four character sequence U+003C LESS-THAN SIGN, U+0021 EXCLAMATION MARK, U+002D HYPHEN-MINUS, U+002D HYPHEN-MINUS ( <code title=""><!--</code> ). Following this sequence, the comment may have <a href="#text2" title="syntax-text">text</a> , with the additional restriction that the text must not <ins class= "diff-new">start with a single U+003E GREATER-THAN SIGN ('>') character, nor start with a U+002D HYPHEN-MINUS (</ins> <code title=""><ins class="diff-new">-</ins></code> <ins class= "diff-new">) character followed by a U+003E GREATER-THAN SIGN ('>') character, nor</ins> contain two consecutive U+002D HYPHEN-MINUS ( <code title="">-</code> ) characters, nor end with a U+002D HYPHEN-MINUS ( <code title="">-</code> ) character. Finally, the comment must be ended by the three character sequence U+002D HYPHEN-MINUS, U+002D HYPHEN-MINUS, U+003E GREATER-THAN SIGN ( <code title="">--></code> ). <h3 id="parsing"><del class= "diff-old">8.2.</del> <ins class="diff-chg">8.2</ins> Parsing HTML documents</h3> This section only applies to user agents, data mining tools, and conformance checkers. The rules for parsing <a href="#xml-documents">XML documents</a> (and thus <a href="#xhtml5">XHTML</a> documents) into DOM trees are covered by the XML and Namespaces in XML specifications, and are out of scope of this specification. <a href="#references">[XML]</a> <a href="#references">[XMLNS]</a> For <a href="#html-">HTML documents</a> , user agents must use the parsing rules described in this section to generate the DOM trees. Together, these rules define what is referred to as the <dfn id="html-0">HTML parser</dfn> . <div class="note"> While the HTML form of HTML5 bears a close resemblance to SGML and XML, it is a separate language with its own parsing rules. Some earlier versions of HTML (in particular from HTML2 to HTML4) were based on SGML and used SGML parsing rules. However, few (if any) web browsers ever implemented true SGML parsing for HTML documents; the only user agents to strictly handle HTML as an SGML application have historically been validators. The resulting confusion — with validators claiming documents to have one representation while widely deployed Web browsers interoperably implemented a different representation — has wasted decades of productivity. This version of HTML thus returns to a non-SGML basis. Authors interested in using SGML tools in their authoring pipeline are encouraged to use XML tools and the XML <del class= "diff-old">serialisation</del> <ins class= "diff-chg">serialization</ins> of HTML5. </div> This specification defines the parsing rules for HTML documents, whether they are syntactically <del class="diff-old">valid</del> <ins class="diff-chg">correct</ins> or not. Certain points in the parsing algorithm are said to be <dfn id="parse1" title= "parse error">parse errors</dfn> . The error handling for parse errors is well-defined: user agents must either act as described below when encountering such problems, or must abort processing at the first error that they encounter for which they do not wish to apply the rules described below. Conformance checkers must report at least one parse error condition to the user if one or more parse error conditions exist in the document and must not report parse error conditions if none exist in the document. Conformance checkers may report more than one parse error condition if more than one parse error conditions exist in the document. Conformance checkers are not required to recover from parse errors. Parse errors are only errors with the syntax of HTML. In addition to checking for parse errors, conformance checkers will also verify that the document obeys all the other conformance requirements described in this specification. <h4 id="overview"><del class= "diff-old">8.2.1.</del> <ins class="diff-chg">8.2.1</ins> Overview of the parsing model</h4> The input to the HTML parsing process consists of a stream of Unicode characters, which is passed through a <a href= "#tokenisation0">tokenisation</a> stage (lexical analysis) followed by a <a href="#tree-construction0">tree construction</a> stage (semantic analysis). The output is a <code>Document</code> object. Implementations that <a href="#non-scripted">do not support scripting</a> do not have to actually create a DOM <code>Document</code> object, but the DOM tree in such cases is still used as the model for the rest of the specification. In the common case, the data handled by the tokenisation stage comes from the network, but <a href="#dynamic2" title= "dynamic markup insertion">it can also come from script</a> , e.g. using the <code title="dom-document-write-HTML"><a href= "#document.write...">document.write()</a></code> API. <img alt="" src="images/parsing-model-overview.png"> There is only one set of state for the tokeniser stage and the tree construction stage, but the tree construction stage is reentrant, meaning that while the tree construction stage is handling one token, the tokeniser might be resumed, causing further tokens to be emitted and processed before the first token's processing is complete. <div class="example"> In the following example, the tree construction stage will be called upon to handle a "p" start tag token while handling the "script" start tag token: <pre> ... <script> document.write('<p>'); </script> ... </pre></div> <h4 id="the-input0"><del class= "diff-old">8.2.2.</del> <ins class="diff-chg">8.2.2</ins> The <dfn id="input0">input stream</dfn></h4> The stream of Unicode characters that consists the input to the tokenisation stage will be initially seen by the user agent as a stream of bytes (typically coming over the network or from the local file system). The bytes encode the actual characters according to a particular character encoding , which the user agent must use to decode the bytes into characters. For XML documents, the algorithm user agents must use to determine the character encoding is given by the XML specification. This section does not apply to XML documents. <a href="#references">[XML]</a> <h5 id="determining">8.2.2.1. Determining the character encoding</h5> In some cases, it might be impractical to unambiguously determine the encoding before parsing the document. Because of this, this specification provides for a two-pass mechanism with an optional pre-scan. Implementations are allowed, as described below, to apply a simplified parsing algorithm to whatever bytes they have available before beginning to parse the document. Then, the real parser is started, using a tentative encoding derived from this pre-parse and other out-of-band metadata. If, while the document is being loaded, the user agent discovers an encoding declaration that conflicts with this information, then the parser can get reinvoked to perform a parse of the document with the real encoding. User agents must use the following algorithm (the <dfn id="encoding0">encoding sniffing algorithm</dfn> ) to determine the character encoding to use when decoding a document in the first pass. This algorithm takes as input any out-of-band metadata available to the user agent (e.g. the <a href="#content-type8" title="Content-Type">Content-Type metadata</a> of the document) and all the bytes available so far, and returns an encoding and a <dfn id="confidence" title= "concept-encoding-confidence">confidence</dfn> . The confidence is either tentative or certain . The encoding used, and whether the confidence in that encoding is tentative or confident , is <a href="#meta-charset-during-parse">used during the parsing</a> to determine whether to <a href= "#change">change the encoding</a> . <ol> <li> If the transport layer specifies an encoding, return that encoding with the <a href="#confidence" title= "concept-encoding-confidence">confidence</a> certain , and abort these steps. </li> <li> The user agent may wait for more bytes of the resource to be available, either in this step or at any later step in this algorithm. For instance, a user agent might wait 500ms or 512 bytes, whichever came first. In general preparsing the source to find the encoding improves performance, as it reduces the need to throw away the data structures used when parsing upon finding the encoding information. However, if the user agent delays too long to obtain data to determine the encoding, then the cost of the delay could outweigh any performance improvements from the preparse. </li> <li> For each of the rows in the following table, starting with the first one and going down, if there are as many or more bytes available than the number of bytes in the first column, and the first bytes of the file match the bytes given in the first column, then return the encoding given in the cell in the second column of that row, with the <a href="#confidence" title= "concept-encoding-confidence">confidence</a> certain , and abort these steps: <table> <thead> <tr> <th>Bytes in Hexadecimal</th> <th><del class="diff-old">Description</del> <ins class= "diff-chg">Encoding</ins></th> </tr> </thead> <tbody> <tr> <td>FE FF</td> <td>UTF-16BE <del class="diff-old">BOM</del></td> </tr> <tr> <td>FF FE</td> <td>UTF-16LE <del class="diff-old">BOM</del></td> </tr> <tr> <td>EF BB BF</td> <td>UTF-8 <del class="diff-old">BOM</del></td> </tr> </tbody> </table> <ins class="diff-new">This step looks for Unicode Byte Order Marks (BOMs).</ins> </li> <li> Otherwise, the user agent will have to search for explicit character encoding information in the file itself. This should proceed as follows: Let <var title="">position</var> be a pointer to a byte in the input stream, initially pointing at the first byte. If at any point during these substeps the user agent either runs out of bytes or decides that scanning further bytes would not be efficient, then skip to the next step of the overall character encoding detection algorithm. User agents may decide that scanning any bytes is not efficient, in which case these substeps are entirely skipped. Now, repeat the following "two" steps until the algorithm aborts (either because user agent aborts, as described above, or because a character encoding is found): <ol> <li> If <var title="">position</var> points to: <dl class="switch"> <dt>A sequence of bytes starting with: 0x3C 0x21 0x2D 0x2D (ASCII '<!--')</dt> <dd> Advance the <var title="">position</var> pointer so that it points at the first 0x3E byte which is preceded by two 0x2D bytes (i.e. at the end of an ASCII '--> ' sequence) and comes after the 0x3C byte that was found. (The two 0x2D bytes can be the same as the those in the '<!--' sequence.) </dd> <dt>A sequence of bytes starting with: 0x3C, 0x4D or 0x6D, 0x45 or 0x65, 0x54 or 0x74, 0x41 or 0x61, and finally one of 0x09, 0x0A, 0x0B, 0x0C, 0x0D, <del class="diff-old">0x20</del> <ins class= "diff-chg">0x20, 0x2F</ins> (case-insensitive ASCII '<meta' followed by a <del class="diff-old">space)</del> <ins class= "diff-chg">space or slash)</ins></dt> <dd> <ol> <li> Advance the <var title="">position</var> pointer so that it points at the next 0x09, 0x0A, 0x0B, 0x0C, 0x0D, <ins class= "diff-new">0x20,</ins> or <del class="diff-old">0x20</del> <ins class="diff-chg">0x2F</ins> byte (the one in sequence of characters matched above). </li> <li> <a href="#get-an" title= "concept-get-attributes-when-sniffing">Get an attribute</a> and its value. If no attribute was sniffed, then skip this inner set of steps, and jump to the second step in the overall "two step" algorithm. </li> <li> <del class="diff-old">Examine the attribute's name: If it is 'charset'</del> If the attribute's <del class= "diff-old">value</del> <ins class="diff-chg">name</ins> is <del class="diff-old">a supported character encoding,</del> <ins class="diff-chg">neither "</ins> <code title=""><ins class= "diff-chg">charset</ins></code> <ins class="diff-chg">" nor "</ins> <code title=""><ins class="diff-chg">content</ins></code> <ins class="diff-chg">",</ins> then return <del class= "diff-old">the given encoding, with confidence tentative , and abort all</del> <ins class="diff-chg">to step 2 in</ins> these <ins class="diff-new">inner</ins> steps. <del class= "diff-old">Otherwise, do nothing with this attribute, and continue looking for other attributes.</del> </li> <li> If <del class="diff-old">it</del> <ins class="diff-chg">the attribute's name</ins> is <del class="diff-old">'content'</del> <ins class="diff-chg">"</ins> <code title=""><ins class= "diff-chg">charset</ins></code> <ins class="diff-chg">", let</ins> <var title=""><ins class="diff-chg">charset</ins></var> <ins class= "diff-chg">be the attribute's value, interpreted as a character encoding.</ins> </li> <li> <del class="diff-old">The</del> <ins class="diff-chg">Otherwise, the</ins> attribute's <del class="diff-old">value</del> <ins class= "diff-chg">name</ins> is <del class="diff-old">now parsed. Apply</del> <ins class="diff-chg">"</ins> <code title= ""><ins class="diff-chg">content</ins></code> <ins class= "diff-chg">": apply</ins> the <a href="#algorithm4">algorithm for extracting an encoding from a Content-Type</a> , giving the attribute's value as the string to parse. If an encoding <del class="diff-old">was</del> <ins class="diff-chg">is</ins> returned, <del class="diff-old">and</del> <ins class= "diff-chg">let</ins> <var title=""><ins class= "diff-chg">charset</ins></var> <ins class="diff-chg">be that encoding. Otherwise, return to step 2 in these inner steps.</ins> </li> <li> <ins class="diff-chg">If</ins> <var title=""><ins class= "diff-chg">charset</ins></var> <ins class="diff-chg">is a UTF-16 encoding, change</ins> it <ins class="diff-new">to UTF-8.</ins> </li> <li> <ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">charset</ins></var> is <del class="diff-old">the name of</del> a supported character encoding, then return <del class= "diff-old">that</del> <ins class="diff-chg">the given</ins> encoding, with <del class="diff-old">the</del> <a href= "#confidence" title="concept-encoding-confidence">confidence</a> tentative , and abort all these steps. </li> <li><del class="diff-old">Otherwise, skip this 'content' attribute and continue on with any other attributes. Any other name</del> <del class="diff-old">Do nothing with that attribute. Return</del> <ins class="diff-chg">Otherwise, return</ins> to step <del class="diff-old">1</del> <ins class="diff-chg">2</ins> in these inner steps. </li> </ol> </dd> <dt>A sequence of bytes starting with a 0x3C byte (ASCII '<'), optionally a 0x2F byte (ASCII '/'), and finally a byte in the range 0x41-0x5A or 0x61-0x7A (an ASCII letter)</dt> <dd> <ol> <li> Advance the <var title="">position</var> pointer so that it points at the next 0x09 (ASCII TAB), 0x0A (ASCII LF), 0x0B (ASCII VT), 0x0C (ASCII FF), 0x0D (ASCII CR), 0x20 (ASCII space), <ins class="diff-new">or</ins> 0x3E (ASCII '> <del class= "diff-old">'), 0x3C (ASCII '<')</del> <ins class= "diff-chg">')</ins> byte. </li> <li> <del class="diff-old">If the pointer points to a 0x3C (ASCII '<') byte, then return to the first step in the overall "two step" algorithm.</del> Repeatedly <a href="#get-an" title= "concept-get-attributes-when-sniffing">get an attribute</a> until no further attributes can be found, then jump to the second step in the overall "two step" algorithm. </li> </ol> </dd> <dt>A sequence of bytes starting with: 0x3C 0x21 (ASCII '<!')</dt> <dt>A sequence of bytes starting with: 0x3C 0x2F (ASCII '</')</dt> <dt>A sequence of bytes starting with: 0x3C 0x3F (ASCII '<?')</dt> <dd> Advance the <var title="">position</var> pointer so that it points at the first 0x3E byte (ASCII '> ') that comes after the 0x3C byte that was found. </dd> <dt>Any other byte</dt> <dd> Do nothing with that byte. </dd> </dl> </li> <li>Move <var title="">position</var> so it points at the next byte in the input stream, and return to the first step of this "two step" algorithm.</li> </ol> When the above "two step" algorithm says to <dfn id="get-an" title="concept-get-attributes-when-sniffing">get an attribute</dfn> , it means doing this: <ol> <li> If the byte at <var title="">position</var> is one of 0x09 (ASCII TAB), 0x0A (ASCII LF), 0x0B (ASCII VT), 0x0C (ASCII FF), 0x0D (ASCII CR), 0x20 (ASCII space), or 0x2F (ASCII '/') then advance <var title="">position</var> to the next byte and <del class="diff-old">start over. If the byte at position is 0x3C (ASCII '<'), then move position back to the previous byte, and stop looking for an attribute. There isn't one.</del> <ins class= "diff-chg">redo this substep.</ins> </li> <li> If the byte at <var title="">position</var> is 0x3E (ASCII '> '), then <del class="diff-old">stop looking for</del> <ins class= "diff-chg">abort the "get</ins> an <del class= "diff-old">attribute.</del> <ins class="diff-chg">attribute" algorithm.</ins> There isn't one. </li> <li> Otherwise, the byte at <var title="">position</var> is the start of the attribute name. Let <var title="">attribute name</var> and <var title="">attribute value</var> be the empty string. </li> <li> Attribute name : Process the byte at <var title= "">position</var> as follows: <dl class="switch"> <dt>If it is 0x3D (ASCII '='), and the <var title="">attribute name</var> is longer than the empty string</dt> <dd>Advance <var title="">position</var> to the next byte and jump to the step below <del class="diff-old">labelled</del> <ins class= "diff-chg">labeled</ins> value .</dd> <dt>If it is 0x09 (ASCII TAB), 0x0A (ASCII LF), 0x0B (ASCII VT), 0x0C (ASCII FF), 0x0D (ASCII CR), or 0x20 (ASCII space)</dt> <dd>Jump to the step below <del class="diff-old">labelled</del> <ins class="diff-chg">labeled</ins> spaces .</dd> <dt>If it is 0x2F (ASCII <del class="diff-old">'/'), 0x3C (ASCII '<'),</del> <ins class="diff-chg">'/')</ins> or 0x3E (ASCII <del class="diff-old">'>')</del> <ins class="diff-chg">'> ')</ins></dt> <dd><del class="diff-old">Stop looking for</del> <ins class= "diff-chg">Abort the "get</ins> an <del class= "diff-old">attribute.</del> <ins class="diff-chg">attribute" algorithm.</ins> The attribute's name is the value of <var title= "">attribute name</var> , its value is the empty string.</dd> <dt>If it is in the range 0x41 (ASCII 'A') to 0x5A (ASCII 'Z')</dt> <dd>Append the Unicode character with codepoint <var title= "">b</var> +0x20 to <var title="">attribute name</var> (where <var title="">b</var> is the value of the byte at <var title="">position</var> ).</dd> <dt>Anything else</dt> <dd>Append the Unicode character with the same codepoint as the value of the byte at <var title="">position</var> ) to <var title= "">attribute name</var> . (It doesn't actually matter how bytes outside the ASCII range are handled here, since only ASCII characters can contribute to the detection of a character encoding.)</dd> </dl> </li> <li> Advance <var title="">position</var> to the next byte and return to the previous step. </li> <li> Spaces. If the byte at <var title="">position</var> is one of 0x09 (ASCII TAB), 0x0A (ASCII LF), 0x0B (ASCII VT), 0x0C (ASCII FF), 0x0D (ASCII CR), or 0x20 (ASCII space) then advance <var title="">position</var> to the next byte, then, repeat this step. </li> <li> If the byte at <var title="">position</var> is not 0x3D (ASCII '='), <del class="diff-old">stop looking for an attribute. Move position back to</del> <ins class="diff-chg">abort</ins> the <del class="diff-old">previous byte.</del> <ins class= "diff-chg">"get an attribute" algorithm.</ins> The attribute's name is the value of <var title="">attribute name</var> , its value is the empty string. </li> <li> Advance <var title="">position</var> past the 0x3D (ASCII '=') byte. </li> <li> Value. If the byte at <var title="">position</var> is one of 0x09 (ASCII TAB), 0x0A (ASCII LF), 0x0B (ASCII VT), 0x0C (ASCII FF), 0x0D (ASCII CR), or 0x20 (ASCII space) then advance <var title="">position</var> to the next byte, then, repeat this step. </li> <li> Process the byte at <var title="">position</var> as follows: <dl class="switch"> <dt>If it is 0x22 (ASCII '"') or 0x27 ("'")</dt> <dd> <ol> <li>Let <var title="">b</var> be the value of the byte at <var title="">position</var> .</li> <li>Advance <var title="">position</var> to the next byte.</li> <li>If the value of the byte at <var title="">position</var> is the value of <var title="">b</var> , then <del class="diff-old">stop looking for</del> <ins class="diff-chg">advance</ins> <var title= ""><ins class="diff-chg">position</ins></var> <ins class= "diff-chg">to the next byte and abort the "get</ins> an <del class= "diff-old">attribute.</del> <ins class="diff-chg">attribute" algorithm.</ins> The attribute's name is the value of <var title= "">attribute name</var> , and its value is the value of <var title= "">attribute value</var> .</li> <li>Otherwise, if the value of the byte at <var title= "">position</var> is in the range 0x41 (ASCII 'A') to 0x5A (ASCII 'Z'), then append a Unicode character to <var title="">attribute value</var> whose codepoint is 0x20 more than the value of the byte at <var title="">position</var> .</li> <li>Otherwise, append a Unicode character to <var title= "">attribute value</var> whose codepoint is the same as the value of the byte at <var title="">position</var> .</li> <li>Return to the second step in these substeps.</li> </ol> </dd> <dt>If it is <del class="diff-old">0x3C (ASCII '<'), or</del> 0x3E (ASCII <del class="diff-old">'>')</del> <ins class= "diff-chg">'> ')</ins></dt> <dd><del class="diff-old">Stop looking for</del> <ins class= "diff-chg">Abort the "get</ins> an <del class= "diff-old">attribute.</del> <ins class="diff-chg">attribute" algorithm.</ins> The attribute's name is the value of <var title= "">attribute name</var> , its value is the empty string.</dd> <dt>If it is in the range 0x41 (ASCII 'A') to 0x5A (ASCII 'Z')</dt> <dd>Append the Unicode character with codepoint <var title= "">b</var> +0x20 to <var title="">attribute value</var> (where <var title="">b</var> is the value of the byte at <var title="">position</var> ). <ins class="diff-new">Advance</ins> <var title=""><ins class="diff-new">position</ins></var> <ins class="diff-new">to the next byte.</ins></dd> <dt>Anything else</dt> <dd>Append the Unicode character with the same codepoint as the value of the byte at <var title="">position</var> ) to <var title= "">attribute value</var> . <ins class="diff-new">Advance</ins> <var title=""><ins class="diff-new">position</ins></var> <ins class="diff-new">to the next byte.</ins></dd> </dl> </li> <li> Process the byte at <var title="">position</var> as follows: <dl class="switch"> <dt>If it is 0x09 (ASCII TAB), 0x0A (ASCII LF), 0x0B (ASCII VT), 0x0C (ASCII FF), 0x0D (ASCII CR), 0x20 (ASCII space), <del class= "diff-old">0x3C (ASCII '<'),</del> or 0x3E (ASCII <del class= "diff-old">'>')</del> <ins class="diff-chg">'> ')</ins></dt> <dd><del class="diff-old">Stop looking for</del> <ins class= "diff-chg">Abort the "get</ins> an <del class= "diff-old">attribute.</del> <ins class="diff-chg">attribute" algorithm.</ins> The attribute's name is the value of <var title= "">attribute name</var> and its value is the value of <var title= "">attribute value</var> .</dd> <dt>If it is in the range 0x41 (ASCII 'A') to 0x5A (ASCII 'Z')</dt> <dd>Append the Unicode character with codepoint <var title= "">b</var> +0x20 to <var title="">attribute value</var> (where <var title="">b</var> is the value of the byte at <var title="">position</var> ).</dd> <dt>Anything else</dt> <dd>Append the Unicode character with the same codepoint as the value of the byte at <var title="">position</var> ) to <var title= "">attribute value</var> .</dd> </dl> </li> <li> Advance <var title="">position</var> to the next byte and return to the previous step. </li> </ol> For the sake of interoperability, user agents should not use a pre-scan algorithm that returns different results than the one described above. (But, if you do, please at least let us know, so that we can improve this algorithm and benefit everyone...) </li> <li> If the user agent has information on the likely encoding for this page, e.g. based on the encoding of the page when it was last visited, then return that encoding, with the <a href="#confidence" title="concept-encoding-confidence">confidence</a> tentative , and abort these steps. </li> <li> The user agent may attempt to autodetect the character encoding from applying frequency analysis or other algorithms to the data stream. If autodetection succeeds in determining a character encoding, then return that encoding, with the <a href="#confidence" title="concept-encoding-confidence">confidence</a> tentative , and abort these steps. <a href= "#references">[UNIVCHARDET]</a> </li> <li> Otherwise, return an implementation-defined or user-specified default character encoding, with the <a href="#confidence" title= "concept-encoding-confidence">confidence</a> tentative . <ins class="diff-new">In non-legacy environments, the more comprehensive</ins> <code title=""><ins class= "diff-new">UTF-8</ins></code> <ins class="diff-new">encoding is recommended.</ins> Due to its use in legacy content, <code title= "">windows-1252</code> is recommended as a default in predominantly Western <del class="diff-old">demographics. In non-legacy environments, the more comprehensive UTF-8 encoding is recommended</del> <ins class="diff-chg">demographics</ins> instead. Since these encodings can in many cases be distinguished by inspection, a user agent may heuristically decide which to use as a default. </li> </ol> <ins class="diff-new">The</ins> <a href= "#character1"><ins class="diff-new">document's character encoding</ins></a> <ins class="diff-new">must immediately be set to the value returned from this algorithm, at the same time as the user agent uses the returned value to select the decoder to use for the input stream.</ins> <h5 id="character0">8.2.2.2. Character encoding requirements</h5> User agents must at a minimum support the UTF-8 and Windows-1252 encodings, but may support more. It is not unusual for Web browsers to support dozens if not upwards of a hundred distinct character encodings. User agents must support the preferred MIME name of every character encoding they support that has a preferred MIME name, and should support all the IANA-registered aliases. <a href= "#references">[IANACHARSET]</a> When <ins class="diff-new">comparing a string specifying a character encoding with the name or alias of a character encoding to determine if they are equal, user agents must ignore the all characters in the ranges U+0009 to U+000D, U+0020 to U+002F, U+003A to U+0040, U+005B to U+0060, and U+007B to U+007E (all whitespace and punctuation characters in ASCII) in both names, and then perform the comparison case-insensitively.</ins> <ins class="diff-new">For instance, "GB_2312-80" and "g.b.2312(80)" are considered equivalent names.</ins> <ins class="diff-new">When</ins> a user agent would otherwise use <ins class="diff-new">an encoding given in</ins> the <del class="diff-old">ISO-8859-1 encoding,</del> <ins class= "diff-chg">first column of the following table,</ins> it must instead use the <ins class="diff-new">encoding given in the cell in the second column of the same row. Any bytes that are treated differently due to this encoding aliasing must be considered</ins> <a href="#parse1" title="parse error"><ins class="diff-new">parse errors</ins></a> . <table> <caption><ins class="diff-new">Character encoding overrides</ins></caption> <thead> <tr> <th><ins class="diff-new">Input encoding</ins></th> <th><ins class="diff-new">Replacement encoding</ins></th> <th><ins class="diff-new">References</ins></th> </tr> </thead> <tbody> <tr> <td><ins class="diff-new">EUC-KR</ins></td> <td><ins class="diff-new">Windows-949</ins></td> <td><a href="#references"><ins class="diff-new">[EUCKR]</ins></a> <a href="#references"><ins class="diff-new">[WIN949]</ins></a></td> </tr> <tr> <td><ins class="diff-new">GB2312</ins></td> <td><ins class="diff-new">GBK</ins></td> <td><a href="#references"><ins class="diff-new">[GB2312]</ins></a> <a href="#references"><ins class="diff-new">[GBK]</ins></a></td> </tr> <tr> <td><ins class="diff-new">GB_2312-80</ins></td> <td><ins class="diff-new">GBK</ins></td> <td><a href="#references"><ins class="diff-new">[RFC1345]</ins></a> <a href="#references"><ins class="diff-new">[GBK]</ins></a></td> </tr> <tr> <td><ins class="diff-new">ISO-8859-1</ins></td> <td>Windows-1252 <del class="diff-old">encoding.</del></td> <td><a href="#references"><ins class="diff-chg">[RFC1345]</ins></a> <a href="#references"><ins class= "diff-chg">[WIN1252]</ins></a></td> </tr> <tr> <td><ins class="diff-chg">ISO-8859-9</ins></td> <td><ins class="diff-chg">Windows-1254</ins></td> <td><a href="#references"><ins class="diff-chg">[RFC1345]</ins></a> <a href="#references"><ins class= "diff-chg">[WIN1254]</ins></a></td> </tr> <tr> <td><ins class="diff-chg">ISO-8859-11</ins></td> <td><ins class="diff-chg">Windows-874</ins></td> <td><a href="#references"><ins class= "diff-chg">[ISO885911]</ins></a> <a href="#references"><ins class= "diff-chg">[WIN874]</ins></a></td> </tr> <tr> <td><ins class="diff-chg">KS_C_5601-1987</ins></td> <td><ins class="diff-chg">Windows-949</ins></td> <td><a href="#references"><ins class="diff-chg">[RFC1345]</ins></a> <a href="#references"><ins class="diff-chg">[WIN949]</ins></a></td> </tr> <tr> <td><ins class="diff-chg">TIS-620</ins></td> <td><ins class="diff-chg">Windows-874</ins></td> <td><a href="#references"><ins class="diff-chg">[TIS620]</ins></a> <a href="#references"><ins class="diff-chg">[WIN874]</ins></a></td> </tr> <tr> <td><ins class="diff-chg">x-x-big5</ins></td> <td><ins class="diff-chg">Big5</ins></td> <td><a href="#references"><ins class= "diff-chg">[BIG5]</ins></a></td> </tr> </tbody> </table> <del class="diff-old">This</del> <ins class= "diff-chg">The</ins> requirement <ins class="diff-new">to treat certain encodings as other encodings according to the table above</ins> is a willful violation of the W3C Character Model specification. <a href="#references">[CHARMOD]</a> User agents must not support the CESU-8, UTF-7, BOCU-1 and SCSU encodings. <a href="#references">[CESU8]</a> <a href= "#references">[UTF7]</a> <a href="#references">[BOCU1]</a> <a href= "#references">[SCSU]</a> Support for UTF-32 is not recommended. This encoding is rarely used, and frequently misimplemented. <ins class="diff-new">This specification does not make any attempt to support UTF-32 in its algorithms; support and use of UTF-32 can thus lead to unexpected behavior in implementations of this specification.</ins> <h5 id="preprocessing">8.2.2.3. Preprocessing the input stream</h5> Given an encoding, the bytes in the input stream must be converted to Unicode characters for the tokeniser, as described by the rules for that encoding, except that <ins class= "diff-new">the</ins> leading U+FEFF BYTE ORDER MARK <del class= "diff-old">characters</del> <ins class="diff-chg">character, if any,</ins> must not be stripped by the encoding <del class= "diff-old">layer.</del> <ins class="diff-chg">layer (it is stripped by the rule below).</ins> Bytes or sequences of bytes in the original byte stream that could not be converted to Unicode characters must be converted to U+FFFD REPLACEMENT CHARACTER code points. <ins class="diff-new">Bytes or sequences of bytes in the original byte stream that did not conform to the encoding specification (e.g. invalid UTF-8 byte sequences in a UTF-8 input stream) are errors that conformance checkers are expected to report.</ins> One leading U+FEFF BYTE ORDER MARK character must be ignored if any are present. All U+0000 NULL characters in the input must be replaced by U+FFFD REPLACEMENT CHARACTERs. Any occurrences of such characters is a <a href="#parse1">parse error</a> . <ins class="diff-new">Any occurrences of any characters in the ranges U+0001 to U+0008, U+000E to U+001F, U+007F to U+009F, U+D800 to U+DFFF , U+FDD0 to U+FDDF, and characters U+FFFE, U+FFFF, U+1FFFE, U+1FFFF, U+2FFFE, U+2FFFF, U+3FFFE, U+3FFFF, U+4FFFE, U+4FFFF, U+5FFFE, U+5FFFF, U+6FFFE, U+6FFFF, U+7FFFE, U+7FFFF, U+8FFFE, U+8FFFF, U+9FFFE, U+9FFFF, U+AFFFE, U+AFFFF, U+BFFFE, U+BFFFF, U+CFFFE, U+CFFFF, U+DFFFE, U+DFFFF, U+EFFFE, U+EFFFF, U+FFFFE, U+FFFFF, U+10FFFE, and U+10FFFF are</ins> <a href= "#parse1" title="parse error"><ins class="diff-new">parse errors</ins></a> .<ins class="diff-new">(These are all control characters or permanently undefined Unicode characters.)</ins> U+000D CARRIAGE RETURN (CR) characters, and U+000A LINE FEED (LF) characters, are treated specially. Any CR characters that are followed by LF characters must be removed, and any CR characters not followed by LF characters must be converted to LF characters. Thus, newlines in HTML DOMs are represented by LF characters, and there are never any CR characters in the input to the <a href= "#tokenisation0">tokenisation</a> stage. The <dfn id="next-input">next input character</dfn> is the first character in the input stream that has not yet been <dfn id= "consumed">consumed</dfn> . Initially, the <a href= "#next-input">next input character</a> is the first character in the input. The <dfn id="insertion">insertion point</dfn> is the position (just before a character or just before the end of the input stream) where content inserted using <code title= "dom-document-write-HTML"><a href= "#document.write...">document.write()</a></code> is actually inserted. The insertion point is relative to the position of the character immediately after it, it is not an absolute offset into the input stream. Initially, the insertion point is <del class= "diff-old">uninitialised.</del> <ins class= "diff-chg">uninitialized.</ins> The "EOF" character in the tables below is a conceptual character representing the end of the <a href="#input0">input stream</a> . If the parser is a <a href= "#script-created">script-created parser</a> , then the end of the <a href="#input0">input stream</a> is reached when an <dfn id= "explicit0">explicit "EOF" character</dfn> (inserted by the <code title="dom-document-close"><a href= "#close">document.close()</a></code> method) is consumed. Otherwise, the "EOF" character is not a real character in the stream, but rather the lack of any further characters. <h5 id="changing">8.2.2.4. Changing the encoding while parsing</h5> When the parser requires the user agent to <dfn id= "change">change the encoding</dfn> , it must run the following steps. This might happen if the <a href="#encoding0">encoding sniffing algorithm</a> described above failed to find an encoding, or if it found an encoding that was not the actual encoding of the file. <ol> <li>If the new encoding is <del class="diff-old">UTF-16,</del> <ins class="diff-chg">a UTF-16 encoding,</ins> change it to UTF-8.</li> <li>If the new encoding is identical or equivalent to the encoding that is already being used to interpret the input stream, then set the <a href="#confidence" title= "concept-encoding-confidence">confidence</a> to confident and abort these steps. This happens when the encoding information found in the file matches what the <a href="#encoding0">encoding sniffing algorithm</a> determined to be the encoding, and in the second pass through the parser if the first pass found that the encoding sniffing algorithm described in the earlier section failed to find the right encoding.</li> <li>If all the bytes up to the last byte converted by the current decoder have the same Unicode interpretations in both the current encoding and the new encoding, and if the user agent supports changing the converter on the fly, then the user agent may change to the new converter for the encoding on the fly. Set the <a href= "#character1"><ins class="diff-new">document's character</ins> encoding</a> <ins class="diff-new">and the encoding used to convert the input stream</ins> to the new encoding, set the <a href= "#confidence" title="concept-encoding-confidence">confidence</a> to confident , and abort these steps.</li> <li>Otherwise, <a href="#navigate">navigate</a> to the document again, with <a href="#replacement">replacement enabled</a> , <ins class="diff-new">and using the same</ins> <a href= "#source0"><ins class="diff-new">source browsing context</ins></a> , but this time skip the <a href="#encoding0">encoding sniffing algorithm</a> and instead just set the encoding to the new encoding and the <a href="#confidence" title= "concept-encoding-confidence">confidence</a> to confident . Whenever possible, this should be done without actually contacting the network layer (the bytes should be re-parsed from memory), even if, e.g., the document is marked as not being cacheable.</li> </ol> <del class="diff-old">While</del> <h4 id="parse"><ins class= "diff-chg">8.2.3</ins> <ins class="diff-chg">Parse state</ins></h4> <h5 id="the-insertion"><ins class= "diff-chg">8.2.3.1.</ins> <ins class="diff-chg">The insertion mode</ins></h5> <ins class="diff-chg">Initially</ins> the <del class= "diff-old">invocation</del> <ins class="diff-chg">insertion mode</ins> <ins class="diff-chg">is "</ins> <a href= "#initial" title="insertion mode: initial"><ins class= "diff-chg">initial</ins></a> <ins class="diff-chg">". It can change to "</ins> <a href="#before4" title= "insertion mode: before html"><ins class="diff-chg">before html</ins></a> <ins class="diff-chg">", "</ins> <a href="#before5" title="insertion mode: before head"><ins class="diff-chg">before head</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-head" title="insertion mode: in head"><ins class="diff-chg">in head</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-head0" title="insertion mode: in head noscript"><ins class="diff-chg">in head noscript</ins></a> <ins class="diff-chg">", "</ins> <a href= "#after4" title="insertion mode: after head"><ins class= "diff-chg">after head</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-body" title="insertion mode: in body"><ins class= "diff-chg">in body</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-table" title="insertion mode: in table"><ins class= "diff-chg">in table</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-caption" title= "insertion mode: in caption"><ins class="diff-chg">in caption</ins></a> <ins class="diff-chg">", "</ins> <a href= "#in-column" title="insertion mode: in column group"><ins class= "diff-chg">in column group</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-table0" title= "insertion mode: in table body"><ins class="diff-chg">in table body</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-row" title="insertion mode: in row"><ins class="diff-chg">in row</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-cell" title="insertion mode: in cell"><ins class="diff-chg">in cell</ins></a> <ins class="diff-chg">", "</ins> <a href= "#in-select" title="insertion mode: in select"><ins class= "diff-chg">in select</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-select0" title= "insertion mode: in select in table"><ins class="diff-chg">in select in table</ins></a> <ins class="diff-chg">", "</ins> <a href= "#in-foreign" title= "insertion mode: in foreign content"><ins class="diff-chg">in foreign content</ins></a> <ins class="diff-chg">", "</ins> <a href= "#after5" title="insertion mode: after body"><ins class= "diff-chg">after body</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-frameset" title= "insertion mode: in frameset"><ins class="diff-chg">in frameset</ins></a> <ins class="diff-chg">", "</ins> <a href= "#after6" title="insertion mode: after frameset"><ins class= "diff-chg">after frameset</ins></a> <ins class="diff-chg">", "</ins> <a href="#after7" title= "insertion mode: after after body"><ins class="diff-chg">after after body</ins></a> <ins class="diff-chg">", and "</ins> <a href= "#after8" title="insertion mode: after after frameset"><ins class= "diff-chg">after after frameset</ins></a> <ins class="diff-chg">" during the course</ins> of <del class="diff-old">this</del> <ins class="diff-chg">the parsing, as described in the</ins> <a href="#tree-construction0"><ins class="diff-chg">tree construction</ins></a> <ins class="diff-chg">stage. The insertion mode affects how tokens are processed and whether CDATA blocks are supported.</ins> <ins class="diff-chg">Seven of these modes, namely "</ins> <a href="#in-head" title="insertion mode: in head"><ins class= "diff-chg">in head</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-body" title="insertion mode: in body"><ins class= "diff-chg">in body</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-table" title="insertion mode: in table"><ins class= "diff-chg">in table</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-table0" title= "insertion mode: in table body"><ins class="diff-chg">in table body</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-row" title="insertion mode: in row"><ins class="diff-chg">in row</ins></a> <ins class="diff-chg">", "</ins> <a href="#in-cell" title="insertion mode: in cell"><ins class="diff-chg">in cell</ins></a> <ins class="diff-chg">", and "</ins> <a href= "#in-select" title="insertion mode: in select"><ins class= "diff-chg">in select</ins></a> <ins class="diff-chg">", are special, in that the other modes defer to them at various times. When the</ins> algorithm <ins class="diff-new">below says that the user agent is to do something "</ins> <dfn id="using8"><ins class= "diff-new">using the rules for</ins></dfn> <ins class= "diff-new">the</ins> <var title=""><ins class= "diff-new">m</ins></var> <ins class="diff-new">insertion mode", where</ins> <var title=""><ins class="diff-new">m</ins></var> <ins class="diff-new">is one of these modes, the user agent must use the rules described under that</ins> <ins class= "diff-new">insertion mode</ins> <ins class="diff-new">'s section, but must leave the</ins> <ins class= "diff-new">insertion mode</ins> <ins class= "diff-new">unchanged (unless the rules in that section themselves switch the</ins> <ins class="diff-new">insertion mode</ins> <ins class="diff-new">).</ins> <ins class="diff-new">When the insertion mode is switched to "</ins> <a href="#in-foreign" title= "insertion mode: in foreign content"><ins class="diff-new">in foreign content</ins></a> <ins class="diff-new">", the</ins> <dfn id="secondary1"><ins class="diff-new">secondary insertion mode</ins></dfn> <ins class="diff-new">is also set. This secondary mode is used within the rules for the "</ins> <a href="#in-foreign" title="insertion mode: in foreign content"><ins class="diff-new">in foreign content</ins></a> <ins class="diff-new">" mode to handle HTML (i.e. not foreign) content.</ins> <ins class="diff-new">When the steps below require the UA to</ins> <dfn id="reset"><ins class="diff-new">reset the insertion mode appropriately</ins></dfn> ,<ins class="diff-new">it means the UA must follow these steps:</ins> <ol> <li><ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">last</ins></var> <ins class="diff-new">be false.</ins></li> <li><ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">node</ins></var> <ins class="diff-new">be the last node in the</ins> <a href="#stack"><ins class="diff-new">stack of open elements</ins></a> .</li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">node</ins></var> <ins class="diff-new">is the first node in the stack of open elements, then set</ins> <var title= ""><ins class="diff-new">last</ins></var> <ins class="diff-new">to true and set</ins> <var title=""><ins class= "diff-new">node</ins></var> <ins class="diff-new">to the</ins> <var title=""><ins class="diff-new">context</ins></var> <ins class= "diff-new">element. (</ins> <a href="#fragment"><ins class= "diff-new">fragment case</ins></a> <ins class= "diff-new">)</ins></li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">node</ins></var> <ins class="diff-new">is a</ins> <code><ins class="diff-new">select</ins></code> <ins class= "diff-new">element, then switch the</ins> <ins class= "diff-new">insertion mode</ins> <ins class="diff-new">to "</ins> <a href="#in-select" title= "insertion mode: in select"><ins class="diff-new">in select</ins></a> <ins class="diff-new">" and abort these steps. (</ins> <a href="#fragment"><ins class="diff-new">fragment case</ins></a> <ins class="diff-new">)</ins></li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">node</ins></var> <ins class="diff-new">is a</ins> <code><a href="#td"><ins class="diff-new">td</ins></a></code> <ins class="diff-new">or</ins> <code><a href="#th"><ins class= "diff-new">th</ins></a></code> <ins class="diff-new">element and</ins> <var title=""><ins class="diff-new">last</ins></var> is <ins class="diff-new">false, then switch the</ins> <ins class="diff-new">insertion mode</ins> <ins class= "diff-new">to "</ins> <a href="#in-cell" title= "insertion mode: in cell"><ins class="diff-new">in cell</ins></a> <ins class="diff-new">" and abort these steps.</ins></li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">node</ins></var> <ins class="diff-new">is a</ins> <code><a href="#tr"><ins class="diff-new">tr</ins></a></code> <ins class="diff-new">element, then switch the</ins> <ins class="diff-new">insertion mode</ins> <ins class= "diff-new">to "</ins> <a href="#in-row" title= "insertion mode: in row"><ins class="diff-new">in row</ins></a> <ins class="diff-new">" and abort these steps.</ins></li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">node</ins></var> <ins class="diff-new">is a</ins> <code><a href="#tbody"><ins class="diff-new">tbody</ins></a></code> ,<code><a href="#thead0"><ins class= "diff-new">thead</ins></a></code> ,<ins class="diff-new">or</ins> <code><a href="#tfoot0"><ins class= "diff-new">tfoot</ins></a></code> <ins class="diff-new">element, then switch the</ins> <ins class="diff-new">insertion mode</ins> <ins class="diff-new">to "</ins> <a href= "#in-table0" title="insertion mode: in table body"><ins class= "diff-new">in table body</ins></a> <ins class="diff-new">" and abort these steps.</ins></li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">node</ins></var> <ins class="diff-new">is a</ins> <code><a href="#caption0"><ins class= "diff-new">caption</ins></a></code> <ins class="diff-new">element, then switch the</ins> <ins class="diff-new">insertion mode</ins> <ins class="diff-new">to "</ins> <a href= "#in-caption" title="insertion mode: in caption"><ins class= "diff-new">in caption</ins></a> <ins class="diff-new">" and abort these steps.</ins></li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">node</ins></var> <ins class="diff-new">is a</ins> <code><a href="#colgroup"><ins class= "diff-new">colgroup</ins></a></code> <ins class="diff-new">element, then switch the</ins> <ins class="diff-new">insertion mode</ins> <ins class="diff-new">to "</ins> <a href= "#in-column" title="insertion mode: in column group"><ins class= "diff-new">in column group</ins></a> <ins class="diff-new">" and abort these steps. (</ins> <a href="#fragment"><ins class= "diff-new">fragment case</ins></a> <ins class= "diff-new">)</ins></li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">node</ins></var> <ins class="diff-new">is a</ins> <code><a href="#table"><ins class="diff-new">table</ins></a></code> <ins class="diff-new">element, then switch the</ins> <ins class="diff-new">insertion mode</ins> <ins class= "diff-new">to "</ins> <a href="#in-table" title= "insertion mode: in table"><ins class="diff-new">in table</ins></a> <ins class="diff-new">" and abort these steps.</ins></li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">node</ins></var> <ins class="diff-new">is an element from the</ins> <a href="#mathml0"><ins class="diff-new">MathML namespace</ins></a> ,<ins class="diff-new">then switch the</ins> <ins class="diff-new">insertion mode</ins> <ins class= "diff-new">to "</ins> <a href="#in-foreign" title= "insertion mode: in foreign content"><ins class="diff-new">in foreign content</ins></a> <ins class="diff-new">", let the</ins> <a href="#secondary1"><ins class="diff-new">secondary insertion mode</ins></a> <ins class="diff-new">be "</ins> <a href="#in-body" title="insertion mode: in body"><ins class="diff-new">in body</ins></a> <ins class="diff-new">", and abort these steps.</ins></li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">node</ins></var> <ins class="diff-new">is a</ins> <code><a href="#head"><ins class="diff-new">head</ins></a></code> <ins class="diff-new">element, then switch the</ins> <ins class="diff-new">insertion mode</ins> <ins class= "diff-new">to "</ins> <a href="#in-body" title= "insertion mode: in body"><ins class="diff-new">in body</ins></a> <ins class="diff-new">" ("</ins> <a href="#in-body" title= "insertion mode: in body"><ins class="diff-new">in body</ins></a> <ins class="diff-new">"!</ins> not <ins class= "diff-new">"</ins> <a href="#in-head" title= "insertion mode: in head"><ins class="diff-new">in head</ins></a> <ins class="diff-new">"</ins> !)<ins class="diff-new">and abort these steps. (</ins> <a href="#fragment"><ins class= "diff-new">fragment case</ins></a> <ins class= "diff-new">)</ins></li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">node</ins></var> <ins class="diff-new">is</ins> a <del class="diff-old">parse error,</del> <code><a href= "#body0"><ins class="diff-chg">body</ins></a></code> <ins class= "diff-chg">element, then switch the</ins> <ins class= "diff-chg">insertion mode</ins> <ins class="diff-chg">to "</ins> <a href="#in-body" title= "insertion mode: in body"><ins class="diff-chg">in body</ins></a> <ins class="diff-chg">" and abort these steps.</ins></li> <li><ins class="diff-chg">If</ins> <var title=""><ins class= "diff-chg">node</ins></var> <ins class="diff-chg">is a</ins> <code><ins class="diff-chg">frameset</ins></code> <ins class= "diff-chg">element, then switch the</ins> <ins class= "diff-chg">insertion mode</ins> <ins class="diff-chg">to "</ins> <a href="#in-frameset" title= "insertion mode: in frameset"><ins class="diff-chg">in frameset</ins></a> <ins class="diff-chg">" and abort these steps. (</ins> <a href="#fragment"><ins class="diff-chg">fragment case</ins></a> <ins class="diff-chg">)</ins></li> <li><ins class="diff-chg">If</ins> <var title=""><ins class= "diff-chg">node</ins></var> <ins class="diff-chg">is an</ins> <code><a href="#html"><ins class="diff-chg">html</ins></a></code> <ins class="diff-chg">element, then: if the</ins> <a href= "#head-element"><code title=""><ins class= "diff-chg">head</ins></code> <ins class="diff-chg">element pointer</ins></a> <ins class="diff-chg">is null, switch the</ins> <ins class="diff-chg">insertion mode</ins> <ins class= "diff-chg">to "</ins> <a href="#before5" title= "insertion mode: before head"><ins class="diff-chg">before head</ins></a> <ins class="diff-chg">", otherwise, switch the</ins> <ins class="diff-chg">insertion mode</ins> <ins class= "diff-chg">to "</ins> <a href="#after4" title= "insertion mode: after head"><ins class="diff-chg">after head</ins></a> <ins class="diff-chg">". In either case, abort these steps. (</ins> <a href="#fragment"><ins class="diff-chg">fragment case</ins></a> <ins class="diff-chg">)</ins></li> <li><ins class="diff-chg">If</ins> <var title=""><ins class= "diff-chg">last</ins></var> <ins class="diff-chg">is true, then switch the</ins> <ins class="diff-chg">insertion mode</ins> <ins class="diff-chg">to "</ins> <a href= "#in-body" title="insertion mode: in body"><ins class="diff-chg">in body</ins></a> <ins class="diff-chg">" and abort these steps. (</ins> <a href="#fragment"><ins class="diff-chg">fragment case</ins></a> <ins class="diff-chg">)</ins></li> <li><ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">node</ins></var> <ins class="diff-chg">now be the node before</ins> <var title=""><ins class="diff-chg">node</ins></var> <ins class="diff-chg">in the</ins> <a href="#stack"><ins class= "diff-chg">stack of open elements</ins></a> .</li> <li><ins class="diff-chg">Return to step 3.</ins></li> </ol> <h5 id="the-stack"><ins class= "diff-chg">8.2.3.2.</ins> <ins class="diff-chg">The stack of open elements</ins></h5> <ins class="diff-chg">Initially the</ins> <dfn id= "stack"><ins class="diff-chg">stack of open elements</ins></dfn> <ins class="diff-chg">is empty. The stack grows downwards; the topmost node on the stack is the first one added to the stack, and the bottommost node of the stack is the most recently added node in the stack (notwithstanding when the stack is manipulated in a random access fashion as part of</ins> <a href= "#adoptionAgency"><ins class="diff-chg">the handling for misnested tags</ins></a> <ins class="diff-chg">).</ins> <ins class="diff-chg">The "</ins> <a href="#before4" title= "insertion mode: before html"><ins class="diff-chg">before html</ins></a> <ins class="diff-chg">"</ins> <ins class= "diff-chg">insertion mode</ins> <ins class= "diff-chg">creates the</ins> <code><a href="#html"><ins class= "diff-chg">html</ins></a></code> <ins class="diff-chg">root element node, which is then added to the stack.</ins> <ins class="diff-chg">In the</ins> <a href= "#fragment"><ins class="diff-chg">fragment case</ins></a> ,<ins class="diff-chg">the</ins> <a href="#stack"><ins class= "diff-chg">stack of open elements</ins></a> <ins class= "diff-chg">is initialized to contain an</ins> <code><a href= "#html"><ins class="diff-chg">html</ins></a></code> <ins class= "diff-chg">element that is created as part of</ins> <a href= "#html-fragment0" title= "html fragment parsing algorithm"><ins class="diff-chg">that algorithm</ins></a> .<ins class="diff-chg">(The</ins> <a href= "#fragment"><ins class="diff-chg">fragment case</ins></a> <ins class="diff-chg">skips the "</ins> <a href="#before4" title= "insertion mode: before html"><ins class="diff-chg">before html</ins></a> <ins class="diff-chg">"</ins> <ins class= "diff-chg">insertion mode</ins> .) <ins class="diff-chg">The</ins> <code><a href= "#html"><ins class="diff-chg">html</ins></a></code> <ins class= "diff-chg">node, however</ins> it is <del class="diff-old">still indicative</del> <ins class="diff-chg">created, is the topmost node</ins> of <del class="diff-old">non-conforming</del> <ins class="diff-chg">the stack. It never gets popped off the stack.</ins> <ins class="diff-chg">The</ins> <dfn id="current5"><ins class= "diff-chg">current node</ins></dfn> <ins class="diff-chg">is the bottommost node in this stack.</ins> <ins class="diff-chg">The</ins> <dfn id="current6"><ins class= "diff-chg">current table</ins></dfn> <ins class="diff-chg">is the last</ins> <code><a href="#table"><ins class= "diff-chg">table</ins></a></code> <ins class="diff-chg">element in the</ins> <a href="#stack"><ins class="diff-chg">stack of open elements</ins></a> ,<ins class="diff-chg">if there is one. If there is no</ins> <code><a href="#table"><ins class= "diff-chg">table</ins></a></code> <ins class="diff-chg">element in the</ins> <a href="#stack"><ins class="diff-chg">stack of open elements</ins></a> <ins class="diff-chg">(</ins> <a href= "#fragment"><ins class="diff-chg">fragment case</ins></a> <ins class="diff-chg">), then the</ins> <a href= "#current6"><ins class="diff-chg">current table</ins></a> <ins class="diff-chg">is the first element in the</ins> <a href= "#stack"><ins class="diff-chg">stack of open elements</ins></a> <ins class="diff-chg">(the</ins> <code><a href="#html"><ins class= "diff-chg">html</ins></a></code> <ins class= "diff-chg">element).</ins> <ins class="diff-chg">Elements in the stack fall into the following categories:</ins> <dl> <dt><dfn id="special"><ins class= "diff-chg">Special</ins></dfn></dt> <dd> <ins class="diff-chg">The following HTML elements have varying levels of special parsing rules:</ins> <code><a href= "#address"><ins class="diff-chg">address</ins></a></code> ,<code><a href="#area"><ins class="diff-chg">area</ins></a></code> ,<code><a href="#base"><ins class="diff-chg">base</ins></a></code> ,<code><ins class="diff-chg">basefont</ins></code> ,<code><ins class="diff-chg">bgsound</ins></code> ,<code><a href= "#blockquote"><ins class="diff-chg">blockquote</ins></a></code> ,<code><a href="#body0"><ins class="diff-chg">body</ins></a></code> ,<code><a href="#br"><ins class="diff-chg">br</ins></a></code> ,<code><ins class="diff-chg">center</ins></code> ,<code><a href= "#col"><ins class="diff-chg">col</ins></a></code> ,<code><a href= "#colgroup"><ins class="diff-chg">colgroup</ins></a></code> ,<code><a href="#dd"><ins class="diff-chg">dd</ins></a></code> ,<code><ins class="diff-chg">dir</ins></code> ,<code><a href= "#div"><ins class="diff-chg">div</ins></a></code> ,<code><a href= "#dl"><ins class="diff-chg">dl</ins></a></code> ,<code><a href= "#dt"><ins class="diff-chg">dt</ins></a></code> ,<code><a href= "#embed"><ins class="diff-chg">embed</ins></a></code> ,<code><ins class="diff-chg">fieldset</ins></code> ,<code><ins class="diff-chg">form</ins></code> ,<code><ins class= "diff-chg">frame</ins></code> ,<code><ins class= "diff-chg">frameset</ins></code> ,<code><a href="#h1"><ins class= "diff-chg">h1</ins></a></code> ,<code><a href="#h2"><ins class= "diff-chg">h2</ins></a></code> ,<code><a href="#h3"><ins class= "diff-chg">h3</ins></a></code> ,<code><a href="#h4"><ins class= "diff-chg">h4</ins></a></code> ,<code><a href="#h5"><ins class= "diff-chg">h5</ins></a></code> ,<code><a href="#h6"><ins class= "diff-chg">h6</ins></a></code> ,<code><a href="#head"><ins class= "diff-chg">head</ins></a></code> ,<code><a href="#hr"><ins class= "diff-chg">hr</ins></a></code> ,<code><a href="#iframe"><ins class= "diff-chg">iframe</ins></a></code> ,<code><a href= "#img"><ins class="diff-chg">img</ins></a></code> ,<code><ins class="diff-chg">input</ins></code> ,<code><ins class= "diff-chg">isindex</ins></code> ,<code><a href="#li"><ins class= "diff-chg">li</ins></a></code> ,<code><a href="#link"><ins class= "diff-chg">link</ins></a></code> ,<code><ins class= "diff-chg">listing</ins></code> ,<code><a href="#menu"><ins class= "diff-chg">menu</ins></a></code> ,<code><a href= "#meta0"><ins class="diff-chg">meta</ins></a></code> ,<code><ins class="diff-chg">noembed</ins></code> ,<code><ins class="diff-chg">noframes</ins></code> ,<code><a href= "#noscript"><ins class="diff-chg">noscript</ins></a></code> ,<code><a href="#ol"><ins class="diff-chg">ol</ins></a></code> ,<code><ins class="diff-chg">optgroup</ins></code> ,<code><ins class="diff-chg">option</ins></code> ,<code><a href= "#p"><ins class="diff-chg">p</ins></a></code> ,<code><a href= "#param"><ins class="diff-chg">param</ins></a></code> ,<code><ins class="diff-chg">plaintext</ins></code> ,<code><a href= "#pre"><ins class="diff-chg">pre</ins></a></code> ,<code><a href= "#script1"><ins class="diff-chg">script</ins></a></code> ,<code><ins class="diff-chg">select</ins></code> ,<code><ins class= "diff-chg">spacer</ins></code> ,<code><a href="#style1"><ins class= "diff-chg">style</ins></a></code> ,<code><a href= "#tbody"><ins class="diff-chg">tbody</ins></a></code> ,<code><ins class="diff-chg">textarea</ins></code> ,<code><a href= "#tfoot0"><ins class="diff-chg">tfoot</ins></a></code> ,<code><a href="#thead0"><ins class= "diff-chg">thead</ins></a></code> ,<code><a href= "#title1"><ins class="diff-chg">title</ins></a></code> ,<code><a href="#tr"><ins class="diff-chg">tr</ins></a></code> ,<code><a href="#ul"><ins class="diff-chg">ul</ins></a></code> ,<ins class="diff-chg">and</ins> <code><ins class= "diff-chg">wbr</ins></code> . </dd> <dt><dfn id="scoping"><ins class= "diff-chg">Scoping</ins></dfn></dt> <dd> <ins class="diff-chg">The following HTML elements introduce new</ins> <a href="#have-an" title= "has an element in scope"><ins class="diff-chg">scopes</ins></a> <ins class="diff-chg">for various parts of the parsing:</ins> <code><a href="#applet"><ins class= "diff-chg">applet</ins></a></code> ,<code><ins class= "diff-chg">button</ins></code> ,<code><a href= "#caption0"><ins class="diff-chg">caption</ins></a></code> ,<code><a href="#html"><ins class="diff-chg">html</ins></a></code> ,<code><ins class="diff-chg">marquee</ins></code> ,<code><a href= "#object"><ins class="diff-chg">object</ins></a></code> ,<code><a href="#table"><ins class= "diff-chg">table</ins></a></code> ,<code><a href="#td"><ins class= "diff-chg">td</ins></a></code> <ins class="diff-chg">and</ins> <code><a href="#th"><ins class="diff-chg">th</ins></a></code> . </dd> <dt><dfn id="formatting"><ins class= "diff-chg">Formatting</ins></dfn></dt> <dd> <ins class="diff-chg">The following HTML elements are those that end up in the</ins> <a href="#list-of4"><ins class="diff-chg">list of active formatting elements</ins></a> :<code><a href= "#a"><ins class="diff-chg">a</ins></a></code> ,<code><a href= "#b"><ins class="diff-chg">b</ins></a></code> ,<code><ins class= "diff-chg">big</ins></code> ,<code><a href="#em"><ins class= "diff-chg">em</ins></a></code> ,<code><ins class= "diff-chg">font</ins></code> ,<code><a href="#i"><ins class= "diff-chg">i</ins></a></code> ,<code><ins class= "diff-chg">nobr</ins></code> ,<code><ins class= "diff-chg">s</ins></code> ,<code><a href="#small"><ins class= "diff-chg">small</ins></a></code> ,<code><ins class= "diff-chg">strike</ins></code> ,<code><a href="#strong"><ins class= "diff-chg">strong</ins></a></code> ,<code><ins class= "diff-chg">tt</ins></code> ,<ins class="diff-chg">and</ins> <code><ins class="diff-chg">u</ins></code> . </dd> <dt><dfn id="phrasing1"><ins class= "diff-chg">Phrasing</ins></dfn></dt> <dd> <ins class="diff-chg">All other elements found while parsing an HTML document.</ins> </dd> </dl> <ins class="diff-chg">Still need to add these new elements to the lists:</ins> <code><a href= "#event-source"><ins class="diff-chg">event-source</ins></a></code> ,<code><a href="#section"><ins class= "diff-chg">section</ins></a></code> ,<code><a href= "#nav"><ins class="diff-chg">nav</ins></a></code> ,<code><a href= "#article"><ins class="diff-chg">article</ins></a></code> ,<code><a href="#aside"><ins class= "diff-chg">aside</ins></a></code> ,<code><a href= "#header"><ins class="diff-chg">header</ins></a></code> ,<code><a href="#footer"><ins class= "diff-chg">footer</ins></a></code> ,<code><a href= "#datagrid0"><ins class="diff-chg">datagrid</ins></a></code> ,<code><a href="#command0"><ins class= "diff-chg">command</ins></a></code> <ins class="diff-chg">The</ins> <a href="#stack"><ins class= "diff-chg">stack of open elements</ins></a> <ins class= "diff-chg">is said to</ins> <dfn id="have-an" title= "has an element in scope"><ins class="diff-chg">have an element in scope</ins></dfn> <ins class="diff-chg">or</ins> <dfn id="have-an0" title="has an element in table scope"><ins class="diff-chg">have an element in</ins> <ins class="diff-chg">table scope</ins></dfn> <ins class="diff-chg">when the following algorithm terminates in a match state:</ins> <ol> <li> <ins class="diff-chg">Initialise</ins> <var title=""><ins class= "diff-chg">node</ins></var> <ins class="diff-chg">to be the</ins> <a href="#current5"><ins class="diff-chg">current node</ins></a> <ins class="diff-chg">(the bottommost node of the stack).</ins> </li> <li> <ins class="diff-chg">If</ins> <var title=""><ins class= "diff-chg">node</ins></var> <ins class="diff-chg">is the target node, terminate in a match state.</ins> </li> <li> <ins class="diff-chg">Otherwise, if</ins> <var title= ""><ins class="diff-chg">node</ins></var> <ins class="diff-chg">is a</ins> <code><a href="#table"><ins class= "diff-chg">table</ins></a></code> <ins class="diff-chg">element, terminate in a failure state.</ins> </li> <li> <ins class="diff-chg">Otherwise, if the algorithm is the "has an element in scope" variant (rather than the "has an element in table scope" variant), and</ins> <var title=""><ins class= "diff-chg">node</ins></var> <ins class="diff-chg">is one of the following, terminate in a failure state:</ins> <ul class="brief"> <li><code><a href="#applet"><ins class= "diff-chg">applet</ins></a></code></li> <li><code><a href="#caption0"><ins class= "diff-chg">caption</ins></a></code></li> <li><code><a href="#td"><ins class= "diff-chg">td</ins></a></code></li> <li><code><a href="#th"><ins class= "diff-chg">th</ins></a></code></li> <li><code><ins class="diff-chg">button</ins></code></li> <li><code><ins class="diff-chg">marquee</ins></code></li> <li><code><a href="#object"><ins class= "diff-chg">object</ins></a></code></li> </ul> </li> <li> <ins class="diff-chg">Otherwise, if</ins> <var title= ""><ins class="diff-chg">node</ins></var> <ins class="diff-chg">is an</ins> <code><a href="#html"><ins class= "diff-chg">html</ins></a></code> <ins class="diff-chg">element, terminate in a failure state. (This can only happen if the</ins> <var title=""><ins class="diff-chg">node</ins></var> <ins class= "diff-chg">is the topmost node of the</ins> <a href= "#stack"><ins class="diff-chg">stack of open elements</ins></a> ,<ins class="diff-chg">and prevents the next step from being invoked if there are no more elements in the stack.)</ins> </li> <li> <ins class="diff-chg">Otherwise, set</ins> <var title= ""><ins class="diff-chg">node</ins></var> <ins class="diff-chg">to the previous entry in the</ins> <a href="#stack"><ins class= "diff-chg">stack of open elements</ins></a> <ins class= "diff-chg">and return to step 2. (This will never fail, since the loop will always terminate in the previous step if the top of the stack is reached.)</ins> </li> </ol> <ins class="diff-chg">Nothing happens if at any time any of the elements in the</ins> <a href="#stack"><ins class="diff-chg">stack of open elements</ins></a> <ins class="diff-chg">are moved to a new location in, or removed from, the</ins> <code><ins class= "diff-chg">Document</ins></code> <ins class="diff-chg">tree. In particular, the stack is not changed in this situation. This can cause, amongst other strange effects,</ins> content <ins class= "diff-new">to be appended to nodes that are no longer in the DOM.</ins> <ins class="diff-new">In some cases (namely, when</ins> <a href="#adoptionAgency"><ins class="diff-new">closing misnested formatting elements</ins></a> <ins class="diff-new">), the stack is manipulated in a random-access fashion.</ins> <h5 id="the-list"><ins class= "diff-new">8.2.3.3.</ins> <ins class="diff-new">The list of active formatting elements</ins></h5> <ins class="diff-new">Initially the</ins> <dfn id= "list-of4"><ins class="diff-new">list of active formatting elements</ins></dfn> <ins class="diff-new">is empty. It is used to handle mis-nested</ins> <a href="#formatting" title= "formatting"><ins class="diff-new">formatting element tags</ins></a> . <ins class="diff-new">The list contains elements in the</ins> <a href="#formatting"><ins class="diff-new">formatting</ins></a> <ins class="diff-new">category, and scope markers. The scope markers are inserted when entering</ins> <code><a href= "#applet"><ins class="diff-new">applet</ins></a></code> <ins class= "diff-new">elements, buttons,</ins> <code><a href= "#object"><ins class="diff-new">object</ins></a></code> <ins class= "diff-new">elements, marquees, table cells, and table captions, and are used to prevent formatting from "leaking" into</ins> <code><a href="#applet"><ins class= "diff-new">applet</ins></a></code> <ins class="diff-new">elements, buttons,</ins> <code><a href="#object"><ins class= "diff-new">object</ins></a></code> <ins class="diff-new">elements, marquees, and tables.</ins> <ins class="diff-new">When the steps below require the UA to</ins> <dfn id="reconstruct"><ins class="diff-new">reconstruct the active formatting elements</ins></dfn> ,<ins class= "diff-new">the UA must perform the following steps:</ins> <ol> <li><ins class="diff-new">If there are no entries in the</ins> <a href="#list-of4"><ins class="diff-new">list of active formatting elements</ins></a> ,<ins class="diff-new">then there is nothing to reconstruct; stop this algorithm.</ins></li> <li><ins class="diff-new">If the last (most recently added) entry in the</ins> <a href="#list-of4"><ins class="diff-new">list of active formatting elements</ins></a> <ins class="diff-new">is a marker, or if it is an element that is in the</ins> <a href= "#stack"><ins class="diff-new">stack of open elements</ins></a> ,<ins class="diff-new">then there is nothing to reconstruct; stop this algorithm.</ins></li> <li><ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">entry</ins></var> <ins class="diff-new">be the last (most recently added) element in the</ins> <a href= "#list-of4"><ins class="diff-new">list of active formatting elements</ins></a> .</li> <li><ins class="diff-new">If there are no entries before</ins> <var title=""><ins class="diff-new">entry</ins></var> <ins class= "diff-new">in the</ins> <a href="#list-of4"><ins class= "diff-new">list of active formatting elements</ins></a> ,<ins class="diff-new">then jump to step 8.</ins></li> <li><ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">entry</ins></var> <ins class="diff-new">be the entry one earlier than</ins> <var title=""><ins class= "diff-new">entry</ins></var> <ins class="diff-new">in the</ins> <a href="#list-of4"><ins class="diff-new">list of active formatting elements</ins></a> .</li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">entry</ins></var> <ins class="diff-new">is neither a marker nor an element that is also in the</ins> <a href= "#stack"><ins class="diff-new">stack of open elements</ins></a> ,<ins class="diff-new">go to step 4.</ins></li> <li><ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">entry</ins></var> <ins class="diff-new">be the element one later than</ins> <var title=""><ins class= "diff-new">entry</ins></var> <ins class="diff-new">in the</ins> <a href="#list-of4"><ins class="diff-new">list of active formatting elements</ins></a> .</li> <li><ins class="diff-new">Perform a shallow clone of the element</ins> <var title=""><ins class="diff-new">entry</ins></var> <ins class="diff-new">to obtain</ins> <var title=""><ins class= "diff-new">clone</ins></var> .<a href="#references"><ins class= "diff-new">[DOM3CORE]</ins></a></li> <li><ins class="diff-new">Append</ins> <var title=""><ins class= "diff-new">clone</ins></var> <ins class="diff-new">to the</ins> <a href="#current5"><ins class="diff-new">current node</ins></a> <ins class="diff-new">and push it onto the</ins> <a href= "#stack"><ins class="diff-new">stack of open elements</ins></a> <ins class="diff-new">so that it is the new</ins> <a href= "#current5"><ins class="diff-new">current node</ins></a> .</li> <li><ins class="diff-new">Replace the entry for</ins> <var title= ""><ins class="diff-new">entry</ins></var> <ins class="diff-new">in the list with an entry for</ins> <var title=""><ins class= "diff-new">clone</ins></var> .</li> <li><ins class="diff-new">If the entry for</ins> <var title= ""><ins class="diff-new">clone</ins></var> <ins class="diff-new">in the</ins> <a href="#list-of4"><ins class="diff-new">list of active formatting elements</ins></a> <ins class="diff-new">is not the last entry in the list, return to step 7.</ins></li> </ol> <ins class="diff-new">This has the effect of reopening all the formatting elements that were opened in the current body, cell, or caption (whichever is youngest) that haven't been explicitly closed.</ins> <ins class="diff-new">The way this specification is written, the</ins> <a href="#list-of4"><ins class="diff-new">list of active formatting elements</ins></a> <ins class= "diff-new">always consists of elements in chronological order with the least recently added element first and the most recently added element last (except for while steps 8 to 11 of the above algorithm are being executed, of course).</ins> <ins class="diff-new">When the steps below require the UA to</ins> <dfn id="clear1"><ins class="diff-new">clear the list of active formatting elements up to the last marker</ins></dfn> ,<ins class="diff-new">the UA must perform the following steps:</ins> <ol> <li><ins class="diff-new">Let</ins> <var title=""><ins class= "diff-new">entry</ins></var> <ins class="diff-new">be the last (most recently added) entry in the</ins> <a href= "#list-of4"><ins class="diff-new">list of active formatting elements</ins></a> .</li> <li><ins class="diff-new">Remove</ins> <var title=""><ins class= "diff-new">entry</ins></var> <ins class="diff-new">from the</ins> <a href="#list-of4"><ins class="diff-new">list of active formatting elements</ins></a> .</li> <li><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">entry</ins></var> <ins class="diff-new">was a marker, then stop the algorithm at this point. The list has been cleared up to the last marker.</ins></li> <li><ins class="diff-new">Go to step 1.</ins></li> </ol> <h5 id="the-element"><ins class= "diff-new">8.2.3.4.</ins> <ins class="diff-new">The element pointers</ins></h5> <ins class="diff-new">Initially the</ins> <dfn id= "head-element"><code title=""><ins class= "diff-new">head</ins></code> <ins class="diff-new">element pointer</ins></dfn> <ins class="diff-new">and the</ins> <dfn id= "form-element"><code title=""><ins class= "diff-new">form</ins></code> <ins class="diff-new">element pointer</ins></dfn> <ins class="diff-new">are both null.</ins> <ins class="diff-new">Once a</ins> <code><a href= "#head"><ins class="diff-new">head</ins></a></code> <ins class= "diff-new">element has been parsed (whether implicitly or explicitly) the</ins> <a href="#head-element"><code title= ""><ins class="diff-new">head</ins></code> <ins class= "diff-new">element pointer</ins></a> <ins class="diff-new">gets set to point to this node.</ins> <ins class="diff-new">The</ins> <a href= "#form-element"><code title=""><ins class= "diff-new">form</ins></code> <ins class="diff-new">element pointer</ins></a> <ins class="diff-new">points to the last</ins> <code><ins class="diff-new">form</ins></code> <ins class= "diff-new">element that was opened and whose end tag has not yet been seen. It is used to make form controls associate with forms in the face of dramatically bad markup, for historical reasons.</ins> <h5 id="the-scripting"><ins class= "diff-new">8.2.3.5.</ins> <ins class="diff-new">The scripting state</ins></h5> <ins class="diff-new">The</ins> <dfn id="scripting2"><ins class= "diff-new">scripting flag</ins></dfn> <ins class="diff-new">is set to "enabled" if the</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">with which the parser is associated was</ins> <a href= "#with-script"><ins class="diff-new">with script</ins></a> <ins class="diff-new">when the parser was created, and "disabled" otherwise.</ins> <h4 id="tokenisation"><del class= "diff-old">8.2.3.</del> <ins class="diff-chg">8.2.4</ins> <dfn id="tokenisation0">Tokenisation</dfn></h4> Implementations must act as if they used the following state machine to tokenise HTML. The state machine must start in the <a href="#data-state">data state</a> . Most states consume a single character, which may have various side-effects, and either switches the state machine to a new state to reconsume the same character, or switches it to a new state (to consume the next character), or repeats the same state (to consume the next character). Some states have more complicated <del class= "diff-old">behaviour</del> <ins class="diff-chg">behavior</ins> and can consume several characters before switching to another state. The exact <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> of certain states depends on a <dfn id= "content2">content model flag</dfn> that is set after certain tokens are emitted. The flag has several states: PCDATA , RCDATA , CDATA , and PLAINTEXT . Initially it must be in the PCDATA state. In the RCDATA and CDATA states, a further <dfn id= "escape">escape flag</dfn> is used to control the <del class= "diff-old">behaviour</del> <ins class="diff-chg">behavior</ins> of the tokeniser. It is either true or false, and initially must be set to the false state. <ins class="diff-new">The</ins> <ins class="diff-new">insertion mode</ins> <ins class= "diff-new">and the</ins> <a href="#stack"><ins class= "diff-new">stack of open elements</ins></a> <ins class= "diff-new">also affects tokenisation.</ins> The output of the tokenisation step is a series of zero or more of the following tokens: DOCTYPE, start tag, end tag, comment, character, end-of-file. DOCTYPE tokens have a name, a public identifier, a system identifier, and a <del class= "diff-old">correctness flag.</del> <ins class= "diff-chg">force-quirks flag</ins> . When a DOCTYPE token is created, its name, public identifier, and system identifier must be marked as <del class="diff-old">missing,</del> <ins class= "diff-chg">missing (which is a distinct state from the empty string),</ins> and the <del class="diff-old">correctness</del> <ins class="diff-chg">force-quirks</ins> flag must be set to <del class="diff-old">correct</del> <ins class= "diff-chg">off</ins> (its other state is <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> ). Start and end tag tokens have a tag <del class= "diff-old">name</del> <ins class="diff-chg">name, a</ins> <ins class="diff-chg">self-closing flag</ins> , and a list of attributes, each of which has a name and a value. <ins class= "diff-new">When a start or end tag token is created, its</ins> <ins class="diff-new">self-closing flag</ins> <ins class= "diff-new">must be unset (its other state is that it be set), and its attributes list must be empty.</ins> Comment and character tokens have data. When a token is emitted, it must immediately be handled by the <a href="#tree-construction0">tree construction</a> stage. The tree construction stage can affect the state of the <a href= "#content2">content model flag</a> , and can insert additional characters into the stream. (For example, the <code><a href= "#script1">script</a></code> element can result in scripts executing and using the <a href="#dynamic2">dynamic markup insertion</a> APIs to insert characters into the stream being tokenised.) When <ins class="diff-new">a start tag token is emitted with its</ins> <ins class="diff-new">self-closing flag</ins> <ins class="diff-new">set, if the flag is not</ins> <dfn id= "acknowledged" title="acknowledge self-closing flag"><ins class= "diff-new">acknowledged</ins></dfn> <ins class="diff-new">when it is processed by the tree construction stage, that is a</ins> <a href="#parse1"><ins class="diff-new">parse error</ins></a> . <ins class="diff-new">When</ins> an end tag token is emitted, the <a href="#content2">content model flag</a> must be switched to the PCDATA state. When an end tag token is emitted with attributes, that is a <a href="#parse1">parse error</a> . <del class="diff-old">A permitted slash</del> <ins class= "diff-chg">When an end tag token</ins> is <del class="diff-old">a U+002F SOLIDUS character</del> <ins class="diff-chg">emitted with its</ins> <ins class="diff-chg">self-closing flag</ins> <ins class="diff-chg">set,</ins> that is <del class= "diff-old">immediately followed by</del> a <del class= "diff-old">U+003E GREATER-THAN SIGN, if, and only if, the current token being processed is a start tag token whose tag name is one of the following: base , link , meta , hr , br , img , embed , param , area , col , input</del> <a href="#parse1"><ins class= "diff-chg">parse error</ins></a> . Before each step of the tokeniser, the user agent may check to see if either one of the scripts in the <a href="#list-of1">list of scripts that will execute as soon as possible</a> or the first script in the <a href="#list-of0">list of scripts that will execute asynchronously</a> , has completed loading . If one has, then it must be <a href="#executing0" title= "executing a script block">executed</a> and removed from its list. The tokeniser state machine is as follows: <dl> <dt><dfn id="data-state">Data state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0026 AMPERSAND (&)</dt> <dd>When the <a href="#content2">content model flag</a> is set to one of the PCDATA or RCDATA <del class="diff-old">states:</del> <ins class="diff-chg">states and the</ins> <a href= "#escape"><ins class="diff-chg">escape flag</ins></a> <ins class= "diff-chg">is false:</ins> switch to the <del class= "diff-old">entity</del> <a href="#character4"><ins class= "diff-chg">character reference</ins> data state</a> .</dd> <dd>Otherwise: treat it as per the "anything else" entry below.</dd> <dt>U+002D HYPHEN-MINUS (-)</dt> <dd> If the <a href="#content2">content model flag</a> is set to either the RCDATA state or the CDATA state, and the <a href= "#escape">escape flag</a> is false, and there are at least three characters before this one in the input stream, and the last four characters in the input stream, including this one, are U+003C LESS-THAN SIGN, U+0021 EXCLAMATION MARK, U+002D HYPHEN-MINUS, and U+002D HYPHEN-MINUS ("<!--"), then set the <a href= "#escape">escape flag</a> to true. In any case, emit the input character as a character token. Stay in the <a href="#data-state">data state</a> . </dd> <dt>U+003C LESS-THAN SIGN (<)</dt> <dd>When the <a href="#content2">content model flag</a> is set to the PCDATA state: switch to the <a href="#tag-open">tag open state</a> .</dd> <dd>When the <a href="#content2">content model flag</a> is set to either the RCDATA state or the CDATA state and the <a href= "#escape">escape flag</a> is false: switch to the <a href= "#tag-open">tag open state</a> .</dd> <dd>Otherwise: treat it as per the "anything else" entry below.</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd> If the <a href="#content2">content model flag</a> is set to either the RCDATA state or the CDATA state, and the <a href= "#escape">escape flag</a> is true, and the last three characters in the input stream including this one are U+002D HYPHEN-MINUS, U+002D HYPHEN-MINUS, U+003E GREATER-THAN SIGN ("-->"), set the <a href= "#escape">escape flag</a> to false. In any case, emit the input character as a character token. Stay in the <a href="#data-state">data state</a> . </dd> <dt>EOF</dt> <dd>Emit an end-of-file token.</dd> <dt>Anything else</dt> <dd>Emit the input character as a character token. Stay in the <a href="#data-state">data state</a> .</dd> </dl> </dd> <dt><del class="diff-old">Entity</del> <dfn id= "character4"><ins class="diff-chg">Character reference</ins> data state</dfn></dt> <dd> (This cannot happen if the <a href="#content2">content model flag</a> is set to the CDATA state.) Attempt to <a href="#consume">consume <del class="diff-old">an entity</del> <ins class="diff-chg">a character reference</ins></a> ,<ins class="diff-chg">with no</ins> <a href= "#additional"><ins class="diff-chg">additional allowed character</ins></a> . If nothing is returned, emit a U+0026 AMPERSAND character token. Otherwise, emit the character token that was returned. Finally, switch to the <a href="#data-state">data state</a> . </dd> <dt><dfn id="tag-open">Tag open state</dfn></dt> <dd> The <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> of this state depends on the <a href= "#content2">content model flag</a> . <dl> <dt>If the <a href="#content2">content model flag</a> is set to the RCDATA or CDATA states</dt> <dd> Consume the <a href="#next-input">next input character</a> . If it is a U+002F SOLIDUS (/) character, switch to the <a href= "#close1">close tag open state</a> . Otherwise, emit a U+003C LESS-THAN SIGN character token and reconsume the current input character in the <a href="#data-state">data state</a> . </dd> <dt>If the <a href="#content2">content model flag</a> is set to the PCDATA state</dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0021 EXCLAMATION MARK (!)</dt> <dd>Switch to the <a href="#markup">markup declaration open state</a> .</dd> <dt>U+002F SOLIDUS (/)</dt> <dd>Switch to the <a href="#close1">close tag open state</a> .</dd> <dt>U+0041 LATIN CAPITAL LETTER A through to U+005A LATIN CAPITAL LETTER Z</dt> <dd>Create a new start tag token, set its tag name to the lowercase version of the input character (add 0x0020 to the character's code point), then switch to the <a href="#tag-name0">tag name state</a> . (Don't emit the token yet; further details will be filled in before it is emitted.)</dd> <dt>U+0061 LATIN SMALL LETTER A through to U+007A LATIN SMALL LETTER Z</dt> <dd>Create a new start tag token, set its tag name to the input character, then switch to the <a href="#tag-name0">tag name state</a> . (Don't emit the token yet; further details will be filled in before it is emitted.)</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd><a href="#parse1">Parse error</a> . Emit a U+003C LESS-THAN SIGN character token and a U+003E GREATER-THAN SIGN character token. Switch to the <a href="#data-state">data state</a> .</dd> <dt>U+003F QUESTION MARK (?)</dt> <dd><a href="#parse1">Parse error</a> . Switch to the <a href= "#bogus">bogus comment state</a> .</dd> <dt>Anything else</dt> <dd><a href="#parse1">Parse error</a> . Emit a U+003C LESS-THAN SIGN character token and reconsume the current input character in the <a href="#data-state">data state</a> .</dd> </dl> </dd> </dl> </dd> <dt><dfn id="close1">Close tag open state</dfn></dt> <dd> If the <a href="#content2">content model flag</a> is set to the RCDATA or CDATA states but no start tag token has ever been emitted by this instance of the tokeniser ( <a href="#fragment">fragment case</a> ), or, if the <a href="#content2">content model flag</a> is set to the RCDATA or CDATA states and the next few characters do not match the tag name of the last start tag token emitted (case insensitively), or if they do but they are not immediately followed by one of the following characters: <ul class="brief"> <li>U+0009 CHARACTER TABULATION</li> <li>U+000A LINE FEED (LF)</li> <li>U+000B LINE TABULATION</li> <li>U+000C FORM FEED (FF)</li> <li>U+0020 SPACE</li> <li>U+003E GREATER-THAN SIGN (>)</li> <li>U+002F SOLIDUS (/)</li> <li>EOF</li> </ul> ...then emit a U+003C LESS-THAN SIGN character token, a U+002F SOLIDUS character token, and switch to the <a href= "#data-state">data state</a> to process the <a href= "#next-input">next input character</a> . Otherwise, if the <a href="#content2">content model flag</a> is set to the PCDATA state, or if the next few characters do match that tag name, consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0041 LATIN CAPITAL LETTER A through to U+005A LATIN CAPITAL LETTER Z</dt> <dd>Create a new end tag token, set its tag name to the lowercase version of the input character (add 0x0020 to the character's code point), then switch to the <a href="#tag-name0">tag name state</a> . (Don't emit the token yet; further details will be filled in before it is emitted.)</dd> <dt>U+0061 LATIN SMALL LETTER A through to U+007A LATIN SMALL LETTER Z</dt> <dd>Create a new end tag token, set its tag name to the input character, then switch to the <a href="#tag-name0">tag name state</a> . (Don't emit the token yet; further details will be filled in before it is emitted.)</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd><a href="#parse1">Parse error</a> . Switch to the <a href= "#data-state">data state</a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit a U+003C LESS-THAN SIGN character token and a U+002F SOLIDUS character token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd><a href="#parse1">Parse error</a> . Switch to the <a href= "#bogus">bogus comment state</a> .</dd> </dl> </dd> <dt><dfn id="tag-name0">Tag name state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Switch to the <a href="#before">before attribute name state</a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd>Emit the current tag token. Switch to the <a href= "#data-state">data state</a> .</dd> <dt>U+0041 LATIN CAPITAL LETTER A through to U+005A LATIN CAPITAL LETTER Z</dt> <dd>Append the lowercase version of the current input character (add 0x0020 to the character's code point) to the current tag token's tag name. Stay in the <a href="#tag-name0">tag name state</a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit the current tag token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>U+002F SOLIDUS (/)</dt> <dd><del class="diff-old">Parse error unless this is a permitted slash .</del> Switch to the <del class="diff-old">before attribute name</del> <a href="#self-closing"><ins class= "diff-chg">self-closing start tag</ins> state</a> .</dd> <dt>Anything else</dt> <dd>Append the current input character to the current tag token's tag name. Stay in the <a href="#tag-name0">tag name state</a> .</dd> </dl> </dd> <dt><dfn id="before">Before attribute name state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Stay in the <a href="#before">before attribute name state</a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd>Emit the current tag token. Switch to the <a href= "#data-state">data state</a> .</dd> <dt>U+0041 LATIN CAPITAL LETTER A through to U+005A LATIN CAPITAL LETTER Z</dt> <dd>Start a new attribute in the current tag token. Set that attribute's name to the lowercase version of the current input character (add 0x0020 to the character's code point), and its value to the empty string. Switch to the <a href="#attribute1">attribute name state</a> .</dd> <dt>U+002F SOLIDUS (/)</dt> <dd><ins class="diff-new">Switch to the</ins> <a href= "#self-closing"><ins class="diff-new">self-closing start tag state</ins></a> .</dd> <dt><ins class="diff-new">U+0022 QUOTATION MARK (")</ins></dt> <dt><ins class="diff-new">U+0027 APOSTROPHE (')</ins></dt> <dt><ins class="diff-new">U+003D EQUALS SIGN (=)</ins></dt> <dd><a href="#parse1">Parse error <del class="diff-old">unless this is a permitted slash</del></a> . <del class="diff-old">Stay in</del> <ins class="diff-chg">Treat it as per</ins> the <del class="diff-old">before attribute name state .</del> <ins class="diff-chg">"anything else" entry below.</ins></dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit the current tag token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Start a new attribute in the current tag token. Set that attribute's name to the current input character, and its value to the empty string. Switch to the <a href="#attribute1">attribute name state</a> .</dd> </dl> </dd> <dt><dfn id="attribute1">Attribute name state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Switch to the <a href="#after">after attribute name state</a> .</dd> <dt>U+003D EQUALS SIGN (=)</dt> <dd>Switch to the <a href="#before0">before attribute value state</a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd>Emit the current tag token. Switch to the <a href= "#data-state">data state</a> .</dd> <dt>U+0041 LATIN CAPITAL LETTER A through to U+005A LATIN CAPITAL LETTER Z</dt> <dd>Append the lowercase version of the current input character (add 0x0020 to the character's code point) to the current attribute's name. Stay in the <a href="#attribute1">attribute name state</a> .</dd> <dt>U+002F SOLIDUS (/)</dt> <dd><del class="diff-old">Parse error unless this is a permitted slash .</del> Switch to the <del class="diff-old">before attribute name</del> <a href="#self-closing"><ins class= "diff-chg">self-closing start tag</ins> state</a> .</dd> <dt><ins class="diff-new">U+0022 QUOTATION MARK (")</ins></dt> <dt><ins class="diff-new">U+0027 APOSTROPHE (')</ins></dt> <dd><a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Treat it as per the "anything else" entry below.</ins></dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit the current tag token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append the current input character to the current attribute's name. Stay in the <a href="#attribute1">attribute name state</a> .</dd> </dl> When the user agent leaves the attribute name state (and before emitting the tag token, if appropriate), the complete attribute's name must be compared to the other attributes on the same token; if there is already an attribute on the token with the exact same name, then this is a <a href="#parse1">parse error</a> and the new attribute must be dropped, along with the value that gets associated with it (if any). </dd> <dt><dfn id="after">After attribute name state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Stay in the <a href="#after">after attribute name state</a> .</dd> <dt>U+003D EQUALS SIGN (=)</dt> <dd>Switch to the <a href="#before0">before attribute value state</a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd>Emit the current tag token. Switch to the <a href= "#data-state">data state</a> .</dd> <dt>U+0041 LATIN CAPITAL LETTER A through to U+005A LATIN CAPITAL LETTER Z</dt> <dd>Start a new attribute in the current tag token. Set that attribute's name to the lowercase version of the current input character (add 0x0020 to the character's code point), and its value to the empty string. Switch to the <a href="#attribute1">attribute name state</a> .</dd> <dt>U+002F SOLIDUS (/)</dt> <dd><del class="diff-old">Parse error unless this is a permitted slash .</del> Switch to the <del class="diff-old">before attribute name</del> <a href="#self-closing"><ins class= "diff-chg">self-closing start tag</ins> state</a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit the current tag token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Start a new attribute in the current tag token. Set that attribute's name to the current input character, and its value to the empty string. Switch to the <a href="#attribute1">attribute name state</a> .</dd> </dl> </dd> <dt><dfn id="before0">Before attribute value state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Stay in the <a href="#before0">before attribute value state</a> .</dd> <dt>U+0022 QUOTATION MARK (")</dt> <dd>Switch to the <a href="#attribute2">attribute value (double-quoted) state</a> .</dd> <dt>U+0026 AMPERSAND (&)</dt> <dd>Switch to the <a href="#attribute4">attribute value (unquoted) state</a> and reconsume this input character.</dd> <dt>U+0027 APOSTROPHE (')</dt> <dd>Switch to the <a href="#attribute3">attribute value (single-quoted) state</a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd>Emit the current tag token. Switch to the <a href= "#data-state">data state</a> .</dd> <dt><ins class="diff-new">U+003D EQUALS SIGN (=)</ins></dt> <dd><a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Treat it as per the "anything else" entry below.</ins></dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit the current tag token. Reconsume the character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append the current input character to the current attribute's value. Switch to the <a href="#attribute4">attribute value (unquoted) state</a> .</dd> </dl> </dd> <dt><dfn id="attribute2">Attribute value (double-quoted) state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0022 QUOTATION MARK (")</dt> <dd>Switch to the <del class="diff-old">before</del> <a href= "#after0"><ins class="diff-chg">after</ins> attribute <del class= "diff-old">name</del> <ins class="diff-chg">value (quoted)</ins> state</a> .</dd> <dt>U+0026 AMPERSAND (&)</dt> <dd>Switch to the <del class="diff-old">entity</del> <a href= "#character5"><ins class="diff-chg">character reference</ins> in attribute value state <del class="diff-old">.</del></a> , <ins class="diff-chg">with the</ins> <a href= "#additional"><ins class="diff-chg">additional allowed character</ins></a> <ins class="diff-chg">being U+0022 QUOTATION MARK (").</ins></dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit the current tag token. Reconsume the character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append the current input character to the current attribute's value. Stay in the <a href="#attribute2">attribute value (double-quoted) state</a> .</dd> </dl> </dd> <dt><dfn id="attribute3">Attribute value (single-quoted) state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0027 APOSTROPHE (')</dt> <dd>Switch to the <del class="diff-old">before</del> <a href= "#after0"><ins class="diff-chg">after</ins> attribute <del class= "diff-old">name</del> <ins class="diff-chg">value (quoted)</ins> state</a> .</dd> <dt>U+0026 AMPERSAND (&)</dt> <dd>Switch to the <del class="diff-old">entity</del> <a href= "#character5"><ins class="diff-chg">character reference</ins> in attribute value state <del class="diff-old">.</del></a> , <ins class="diff-chg">with the</ins> <a href= "#additional"><ins class="diff-chg">additional allowed character</ins></a> <ins class="diff-chg">being U+0027 APOSTROPHE (').</ins></dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit the current tag token. Reconsume the character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append the current input character to the current attribute's value. Stay in the <a href="#attribute3">attribute value (single-quoted) state</a> .</dd> </dl> </dd> <dt><dfn id="attribute4">Attribute value (unquoted) state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Switch to the <a href="#before">before attribute name state</a> .</dd> <dt>U+0026 AMPERSAND (&)</dt> <dd>Switch to the <del class="diff-old">entity</del> <a href= "#character5"><ins class="diff-chg">character reference</ins> in attribute value state</a> , <ins class="diff-new">with no</ins> <a href="#additional"><ins class="diff-new">additional allowed character</ins></a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd>Emit the current tag token. Switch to the <a href= "#data-state">data state</a> .</dd> <dt><ins class="diff-new">U+0022 QUOTATION MARK (")</ins></dt> <dt><ins class="diff-new">U+0027 APOSTROPHE (')</ins></dt> <dt><ins class="diff-new">U+003D EQUALS SIGN (=)</ins></dt> <dd><a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Treat it as per the "anything else" entry below.</ins></dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit the current tag token. Reconsume the character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append the current input character to the current attribute's value. Stay in the <a href="#attribute4">attribute value (unquoted) state</a> .</dd> </dl> </dd> <dt><del class="diff-old">Entity</del> <dfn id= "character5"><ins class="diff-chg">Character reference</ins> in attribute value state</dfn></dt> <dd> Attempt to <a href="#consume">consume <del class="diff-old">an entity</del> <ins class="diff-chg">a character reference</ins></a> . If nothing is returned, append a U+0026 AMPERSAND character to the current attribute's value. Otherwise, append the returned character token to the current attribute's value. Finally, switch back to the attribute value state that you were in when were switched into this state. </dd> <dt><dfn id="after0"><ins class="diff-new">After attribute value (quoted) state</ins></dfn></dt> <dd> <ins class="diff-new">Consume the</ins> <a href= "#next-input"><ins class="diff-new">next input character</ins></a> : <dl class="switch"> <dt><ins class="diff-new">U+0009 CHARACTER TABULATION</ins></dt> <dt><ins class="diff-new">U+000A LINE FEED (LF)</ins></dt> <dt><ins class="diff-new">U+000B LINE TABULATION</ins></dt> <dt><ins class="diff-new">U+000C FORM FEED (FF)</ins></dt> <dt><ins class="diff-new">U+0020 SPACE</ins></dt> <dd><ins class="diff-new">Switch to the</ins> <a href= "#before"><ins class="diff-new">before attribute name state</ins></a> .</dd> <dt><ins class="diff-new">U+003E GREATER-THAN SIGN (>)</ins></dt> <dd><ins class="diff-new">Emit the current tag token. Switch to the</ins> <a href="#data-state"><ins class="diff-new">data state</ins></a> .</dd> <dt><ins class="diff-new">U+002F SOLIDUS (/)</ins></dt> <dd><ins class="diff-new">Switch to the</ins> <a href= "#self-closing"><ins class="diff-new">self-closing start tag state</ins></a> .</dd> <dt><ins class="diff-new">EOF</ins></dt> <dd><a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Emit the current tag token. Reconsume the EOF character in the</ins> <a href="#data-state"><ins class= "diff-new">data state</ins></a> .</dd> <dt><ins class="diff-new">Anything else</ins></dt> <dd><a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Reconsume the character in the</ins> <a href="#before"><ins class="diff-new">before attribute name state</ins></a> .</dd> </dl> </dd> <dt><dfn id="self-closing"><ins class="diff-new">Self-closing start tag state</ins></dfn></dt> <dd> <ins class="diff-new">Consume the</ins> <a href= "#next-input"><ins class="diff-new">next input character</ins></a> : <dl class="switch"> <dt><ins class="diff-new">U+003E GREATER-THAN SIGN (>)</ins></dt> <dd><ins class="diff-new">Set the</ins> <ins class= "diff-new">self-closing flag</ins> <ins class="diff-new">of the current tag token. Emit the current tag token. Switch to the</ins> <a href="#data-state"><ins class="diff-new">data state</ins></a> .</dd> <dt><ins class="diff-new">EOF</ins></dt> <dd><a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Emit the current tag token. Reconsume the EOF character in the</ins> <a href="#data-state"><ins class= "diff-new">data state</ins></a> .</dd> <dt><ins class="diff-new">Anything else</ins></dt> <dd><a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Reconsume the character in the</ins> <a href="#before"><ins class="diff-new">before attribute name state</ins></a> .</dd> </dl> </dd> <dt><dfn id="bogus">Bogus comment state</dfn></dt> <dd> (This can only happen if the <a href="#content2">content model flag</a> is set to the PCDATA state.) Consume every character up to the first U+003E GREATER-THAN SIGN character (>) or the end of the file (EOF), whichever comes first. Emit a comment token whose data is the concatenation of all the characters starting from and including the character that caused the state machine to switch into the bogus comment state, up to and including the last consumed character before the U+003E character, if any, or up to the end of the file otherwise. (If the comment was started by the end of the file (EOF), the token is empty.) Switch to the <a href="#data-state">data state</a> . If the end of the file was reached, reconsume the EOF character. </dd> <dt><dfn id="markup">Markup declaration open state</dfn></dt> <dd> (This can only happen if the <a href="#content2">content model flag</a> is set to the PCDATA state.) If the next two characters are both U+002D HYPHEN-MINUS (-) characters, consume those two characters, create a comment token whose data is the empty string, and switch to the <a href= "#comment0">comment start state</a> . <del class="diff-old">Otherwise</del> <ins class= "diff-chg">Otherwise,</ins> if the next seven characters are a case-insensitive match for the word "DOCTYPE", then consume those characters and switch to the <a href= "#doctype0">DOCTYPE state</a> . Otherwise, <ins class="diff-new">if the</ins> <ins class= "diff-new">insertion mode</ins> is <ins class= "diff-new">"</ins> <a href="#in-foreign" title= "insertion mode: in foreign content"><ins class="diff-new">in foreign content</ins></a> <ins class="diff-new">" and the</ins> <a href="#current5"><ins class="diff-new">current node</ins></a> is <ins class="diff-new">not an element in the</ins> <a href= "#html-namespace0"><ins class="diff-new">HTML namespace</ins></a> <ins class="diff-new">and the next seven characters are</ins> a <ins class="diff-chg">case-sensitive</ins> <ins class= "diff-chg">match for the string "[CDATA[" (the five uppercase letters "CDATA" with a U+005B LEFT SQUARE BRACKET character before and after), then consume those characters and switch to the</ins> <a href="#cdata1"><ins class="diff-chg">CDATA block state</ins></a> <ins class="diff-chg">(which is unrelated to the</ins> <a href= "#content2"><ins class="diff-chg">content model flag</ins></a> <ins class="diff-chg">'s CDATA state).</ins> <ins class="diff-chg">Otherwise, this is a</ins> <a href= "#parse1">parse error</a> . Switch to the <a href="#bogus">bogus comment state</a> . The next character that is consumed, if any, is the first character that will be in the comment. </dd> <dt><dfn id="comment0">Comment start state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+002D HYPHEN-MINUS (-)</dt> <dd>Switch to the <a href="#comment1">comment start dash state</a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd><a href="#parse1">Parse error</a> . Emit the comment token. Switch to the <a href="#data-state">data state</a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit the comment token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append the input character to the comment token's data. Switch to the <a href="#comment">comment state</a> .</dd> </dl> </dd> <dt><dfn id="comment1">Comment start dash state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+002D HYPHEN-MINUS (-)</dt> <dd>Switch to the <a href="#comment3">comment end state</a></dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd><a href="#parse1">Parse error</a> . Emit the comment token. Switch to the <a href="#data-state">data state</a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit the comment token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append a U+002D HYPHEN-MINUS (-) character and the input character to the comment token's data. Switch to the <a href= "#comment">comment state</a> .</dd> </dl> </dd> <dt><dfn id="comment">Comment state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+002D HYPHEN-MINUS (-)</dt> <dd>Switch to the <a href="#comment2">comment end dash state</a></dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit the comment token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append the input character to the comment token's data. Stay in the <a href="#comment">comment state</a> .</dd> </dl> </dd> <dt><dfn id="comment2">Comment end dash state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+002D HYPHEN-MINUS (-)</dt> <dd>Switch to the <a href="#comment3">comment end state</a></dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit the comment token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append a U+002D HYPHEN-MINUS (-) character and the input character to the comment token's data. Switch to the <a href= "#comment">comment state</a> .</dd> </dl> </dd> <dt><dfn id="comment3">Comment end state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd>Emit the comment token. Switch to the <a href= "#data-state">data state</a> .</dd> <dt>U+002D HYPHEN-MINUS (-)</dt> <dd><a href="#parse1">Parse error</a> . Append a U+002D HYPHEN-MINUS (-) character to the comment token's data. Stay in the <a href="#comment3">comment end state</a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Emit the comment token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd><a href="#parse1">Parse error</a> . Append two U+002D HYPHEN-MINUS (-) characters and the input character to the comment token's data. Switch to the <a href="#comment">comment state</a> .</dd> </dl> </dd> <dt><dfn id="doctype0">DOCTYPE state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Switch to the <a href="#before1">before DOCTYPE name state</a> .</dd> <dt>Anything else</dt> <dd><a href="#parse1">Parse error</a> . Reconsume the current character in the <a href="#before1">before DOCTYPE name state</a> .</dd> </dl> </dd> <dt><dfn id="before1">Before DOCTYPE name state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Stay in the <a href="#before1">before DOCTYPE name state</a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd><a href="#parse1">Parse error</a> . Create a new DOCTYPE token. Set its <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit the token. Switch to the <a href="#data-state">data state</a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Create a new DOCTYPE token. Set its <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit the token. Reconsume the EOF character in the <a href= "#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Create a new DOCTYPE token. Set the token's name <del class= "diff-old">name</del> to the current input character. Switch to the <a href="#doctype1">DOCTYPE name state</a> .</dd> </dl> </dd> <dt><dfn id="doctype1">DOCTYPE name state</dfn></dt> <dd> First, consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Switch to the <a href="#after1">after DOCTYPE name state</a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd>Emit the current DOCTYPE token. Switch to the <a href= "#data-state">data state</a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Set the DOCTYPE token's <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit that DOCTYPE token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append the current input character to the current DOCTYPE token's name. Stay in the <a href="#doctype1">DOCTYPE name state</a> .</dd> </dl> </dd> <dt><dfn id="after1">After DOCTYPE name state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Stay in the <a href="#after1">after DOCTYPE name state</a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd>Emit the current DOCTYPE token. Switch to the <a href= "#data-state">data state</a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Set the DOCTYPE token's <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit that DOCTYPE token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd> If the next six characters are a case-insensitive match for the word "PUBLIC", then consume those characters and switch to the <a href="#before2">before DOCTYPE public identifier state</a> . Otherwise, if the next six characters are a case-insensitive match for the word "SYSTEM", then consume those characters and switch to the <a href= "#before3">before DOCTYPE system identifier state</a> . Otherwise, this is the <a href="#parse1">parse error</a> . <ins class="diff-new">Set the DOCTYPE token's</ins> <ins class= "diff-new">force-quirks flag</ins> <ins class= "diff-new">to</ins> <ins class="diff-new">on</ins> . Switch to the <a href="#bogus0">bogus DOCTYPE state</a> . </dd> </dl> </dd> <dt><dfn id="before2">Before DOCTYPE public identifier state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Stay in the <a href="#before2">before DOCTYPE public identifier state</a> .</dd> <dt>U+0022 QUOTATION MARK (")</dt> <dd>Set the DOCTYPE token's public identifier to the empty <del class="diff-old">string,</del> <ins class="diff-chg">string (not missing),</ins> then switch to the <a href="#doctype2">DOCTYPE public identifier (double-quoted) state</a> .</dd> <dt>U+0027 APOSTROPHE (')</dt> <dd>Set the DOCTYPE token's public identifier to the empty <del class="diff-old">string,</del> <ins class="diff-chg">string (not missing),</ins> then switch to the <a href="#doctype3">DOCTYPE public identifier (single-quoted) state</a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd><a href="#parse1">Parse error</a> . Set the DOCTYPE token's <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit that DOCTYPE token. Switch to the <a href="#data-state">data state</a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Set the DOCTYPE token's <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit that DOCTYPE token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd><a href="#parse1">Parse error</a> . <ins class="diff-new">Set the DOCTYPE token's</ins> <ins class="diff-new">force-quirks flag</ins> <ins class="diff-new">to</ins> <ins class= "diff-new">on</ins> . Switch to the <a href="#bogus0">bogus DOCTYPE state</a> .</dd> </dl> </dd> <dt><dfn id="doctype2">DOCTYPE public identifier (double-quoted) state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0022 QUOTATION MARK (")</dt> <dd>Switch to the <a href="#after2">after DOCTYPE public identifier state</a> .</dd> <dt><ins class="diff-new">U+003E GREATER-THAN SIGN (>)</ins></dt> <dd><a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Set the DOCTYPE token's</ins> <ins class= "diff-new">force-quirks flag</ins> <ins class= "diff-new">to</ins> <ins class="diff-new">on</ins> .<ins class="diff-new">Emit that DOCTYPE token. Switch to the</ins> <a href="#data-state"><ins class="diff-new">data state</ins></a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Set the DOCTYPE token's <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit that DOCTYPE token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append the current input character to the current DOCTYPE token's public identifier. Stay in the <a href="#doctype2">DOCTYPE public identifier (double-quoted) state</a> .</dd> </dl> </dd> <dt><dfn id="doctype3">DOCTYPE public identifier (single-quoted) state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0027 APOSTROPHE (')</dt> <dd>Switch to the <a href="#after2">after DOCTYPE public identifier state</a> .</dd> <dt><ins class="diff-new">U+003E GREATER-THAN SIGN (>)</ins></dt> <dd><a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Set the DOCTYPE token's</ins> <ins class= "diff-new">force-quirks flag</ins> <ins class= "diff-new">to</ins> <ins class="diff-new">on</ins> .<ins class="diff-new">Emit that DOCTYPE token. Switch to the</ins> <a href="#data-state"><ins class="diff-new">data state</ins></a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Set the DOCTYPE token's <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit that DOCTYPE token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append the current input character to the current DOCTYPE token's public identifier. Stay in the <a href="#doctype3">DOCTYPE public identifier (single-quoted) state</a> .</dd> </dl> </dd> <dt><dfn id="after2">After DOCTYPE public identifier state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Stay in the <a href="#after2">after DOCTYPE public identifier state</a> .</dd> <dt>U+0022 QUOTATION MARK (")</dt> <dd>Set the DOCTYPE token's system identifier to the empty <del class="diff-old">string,</del> <ins class="diff-chg">string (not missing),</ins> then switch to the <a href="#doctype4">DOCTYPE system identifier (double-quoted) state</a> .</dd> <dt>U+0027 APOSTROPHE (')</dt> <dd>Set the DOCTYPE token's system identifier to the empty <del class="diff-old">string,</del> <ins class="diff-chg">string (not missing),</ins> then switch to the <a href="#doctype5">DOCTYPE system identifier (single-quoted) state</a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd>Emit the current DOCTYPE token. Switch to the <a href= "#data-state">data state</a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Set the DOCTYPE token's <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit that DOCTYPE token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd><a href="#parse1">Parse error</a> . <ins class="diff-new">Set the DOCTYPE token's</ins> <ins class="diff-new">force-quirks flag</ins> <ins class="diff-new">to</ins> <ins class= "diff-new">on</ins> . Switch to the <a href="#bogus0">bogus DOCTYPE state</a> .</dd> </dl> </dd> <dt><dfn id="before3">Before DOCTYPE system identifier state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Stay in the <a href="#before3">before DOCTYPE system identifier state</a> .</dd> <dt>U+0022 QUOTATION MARK (")</dt> <dd>Set the DOCTYPE token's system identifier to the empty <del class="diff-old">string,</del> <ins class="diff-chg">string (not missing),</ins> then switch to the <a href="#doctype4">DOCTYPE system identifier (double-quoted) state</a> .</dd> <dt>U+0027 APOSTROPHE (')</dt> <dd>Set the DOCTYPE token's system identifier to the empty <del class="diff-old">string,</del> <ins class="diff-chg">string (not missing),</ins> then switch to the <a href="#doctype5">DOCTYPE system identifier (single-quoted) state</a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd><a href="#parse1">Parse error</a> . Set the DOCTYPE token's <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit that DOCTYPE token. Switch to the <a href="#data-state">data state</a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Set the DOCTYPE token's <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit that DOCTYPE token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd><a href="#parse1">Parse error</a> . <ins class="diff-new">Set the DOCTYPE token's</ins> <ins class="diff-new">force-quirks flag</ins> <ins class="diff-new">to</ins> <ins class= "diff-new">on</ins> . Switch to the <a href="#bogus0">bogus DOCTYPE state</a> .</dd> </dl> </dd> <dt><dfn id="doctype4">DOCTYPE system identifier (double-quoted) state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0022 QUOTATION MARK (")</dt> <dd>Switch to the <a href="#after3">after DOCTYPE system identifier state</a> .</dd> <dt><ins class="diff-new">U+003E GREATER-THAN SIGN (>)</ins></dt> <dd><a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Set the DOCTYPE token's</ins> <ins class= "diff-new">force-quirks flag</ins> <ins class= "diff-new">to</ins> <ins class="diff-new">on</ins> .<ins class="diff-new">Emit that DOCTYPE token. Switch to the</ins> <a href="#data-state"><ins class="diff-new">data state</ins></a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Set the DOCTYPE token's <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit that DOCTYPE token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append the current input character to the current DOCTYPE token's system identifier. Stay in the <a href="#doctype4">DOCTYPE system identifier (double-quoted) state</a> .</dd> </dl> </dd> <dt><dfn id="doctype5">DOCTYPE system identifier (single-quoted) state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0027 APOSTROPHE (')</dt> <dd>Switch to the <a href="#after3">after DOCTYPE system identifier state</a> .</dd> <dt><ins class="diff-new">U+003E GREATER-THAN SIGN (>)</ins></dt> <dd><a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Set the DOCTYPE token's</ins> <ins class= "diff-new">force-quirks flag</ins> <ins class= "diff-new">to</ins> <ins class="diff-new">on</ins> .<ins class="diff-new">Emit that DOCTYPE token. Switch to the</ins> <a href="#data-state"><ins class="diff-new">data state</ins></a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Set the DOCTYPE token's <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit that DOCTYPE token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Append the current input character to the current DOCTYPE token's system identifier. Stay in the <a href="#doctype5">DOCTYPE system identifier (single-quoted) state</a> .</dd> </dl> </dd> <dt><dfn id="after3">After DOCTYPE system identifier state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dd>Stay in the <a href="#after3">after DOCTYPE system identifier state</a> .</dd> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd>Emit the current DOCTYPE token. Switch to the <a href= "#data-state">data state</a> .</dd> <dt>EOF</dt> <dd><a href="#parse1">Parse error</a> . Set the DOCTYPE token's <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> . Emit that DOCTYPE token. Reconsume the EOF character in the <a href="#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd><a href="#parse1">Parse error</a> . Switch to the <a href= "#bogus0">bogus DOCTYPE state</a> . <ins class="diff-new">(This does</ins> <ins class="diff-new">not</ins> <ins class= "diff-new">set the DOCTYPE token's</ins> <ins class= "diff-new">force-quirks flag</ins> <ins class= "diff-new">to</ins> <ins class="diff-new">on</ins> .)</dd> </dl> </dd> <dt><dfn id="bogus0">Bogus DOCTYPE state</dfn></dt> <dd> Consume the <a href="#next-input">next input character</a> : <dl class="switch"> <dt>U+003E GREATER-THAN SIGN (>)</dt> <dd><del class="diff-old">Set the DOCTYPE token's correctness flag to incorrect .</del> Emit <del class="diff-old">that</del> <ins class="diff-chg">the</ins> DOCTYPE token. Switch to the <a href="#data-state">data state</a> .</dd> <dt>EOF</dt> <dd><del class="diff-old">Parse error . Set the DOCTYPE token's correctness flag to incorrect .</del> Emit <del class= "diff-old">that</del> <ins class="diff-chg">the</ins> DOCTYPE token. Reconsume the EOF character in the <a href= "#data-state">data state</a> .</dd> <dt>Anything else</dt> <dd>Stay in the <a href="#bogus0">bogus DOCTYPE state</a> .</dd> </dl> </dd> <dt><dfn id="cdata1"><ins class="diff-new">CDATA block state</ins></dfn></dt> <dd> <ins class="diff-new">(This can only happen if the</ins> <a href="#content2"><ins class="diff-new">content model flag</ins></a> <ins class="diff-new">is set to the PCDATA state, and is unrelated to the</ins> <a href="#content2"><ins class= "diff-new">content model flag</ins></a> <ins class="diff-new">'s CDATA state.)</ins> <ins class="diff-new">Consume every character up to the next occurrence of the three character sequence U+005D RIGHT SQUARE BRACKET U+005D RIGHT SQUARE BRACKET U+003E GREATER-THAN SIGN (</ins> <code title=""><ins class="diff-new">]]></ins></code> <ins class="diff-new">), or the end of the file (EOF), whichever comes first. Emit a series of text tokens consisting of all the characters consumed except the matching three character sequence at the end (if one was found before the end of the file).</ins> <ins class="diff-new">Switch to the</ins> <a href= "#data-state"><ins class="diff-new">data state</ins></a> . <ins class="diff-new">If the end of the file was reached, reconsume the EOF character.</ins> </dd> </dl> <h5 id="tokenising"><del class= "diff-old">8.2.3.1.</del> <ins class= "diff-chg">8.2.4.1.</ins> Tokenising <del class= "diff-old">entities</del> <ins class="diff-chg">character references</ins></h5> This section defines how to <dfn id="consume">consume <del class="diff-old">an entity</del> <ins class="diff-chg">a character reference</ins></dfn> . This definition is used when parsing <del class="diff-old">entities</del> <ins class= "diff-chg">character references</ins> <a href="#character4" title= "character reference data state">in text</a> and <a href= "#character5" title= "character reference in attribute value state">in attributes</a> . The <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> depends on the identity of the next character (the one immediately after the U+0026 AMPERSAND character): <dl class="switch"> <dt>U+0009 CHARACTER TABULATION</dt> <dt>U+000A LINE FEED (LF)</dt> <dt>U+000B LINE TABULATION</dt> <dt>U+000C FORM FEED (FF)</dt> <dt>U+0020 SPACE</dt> <dt>U+003C LESS-THAN SIGN</dt> <dt>U+0026 AMPERSAND</dt> <dt>EOF</dt> <dt><ins class="diff-new">The</ins> <dfn id= "additional"><ins class="diff-new">additional allowed character</ins></dfn> ,<ins class="diff-new">if there is one</ins></dt> <dd>Not <del class="diff-old">an entity.</del> <ins class= "diff-chg">a character reference.</ins> No characters are consumed, and nothing is returned. (This is not an error, either.)</dd> <dt>U+0023 NUMBER SIGN (#)</dt> <dd> Consume the U+0023 NUMBER SIGN. The <del class="diff-old">behaviour</del> <ins class= "diff-chg">behavior</ins> further depends on the character after the U+0023 NUMBER SIGN: <dl class="switch"> <dt>U+0078 LATIN SMALL LETTER X</dt> <dt>U+0058 LATIN CAPITAL LETTER X</dt> <dd> Consume the X. Follow the steps below, but using the range of characters U+0030 DIGIT ZERO through to U+0039 DIGIT NINE, U+0061 LATIN SMALL LETTER A through to U+0066 LATIN SMALL LETTER F, and U+0041 LATIN CAPITAL LETTER A, through to U+0046 LATIN CAPITAL LETTER F (in other words, 0-9, A-F, a-f). When it comes to interpreting the number, interpret it as a hexadecimal number. </dd> <dt>Anything else</dt> <dd> Follow the steps below, but using the range of characters U+0030 DIGIT ZERO through to U+0039 DIGIT NINE (i.e. just 0-9). When it comes to interpreting the number, interpret it as a decimal number. </dd> </dl> Consume as many characters as match the range of characters given above. If no characters match the range, then don't consume any characters (and unconsume the U+0023 NUMBER SIGN character and, if appropriate, the X character). This is a <a href="#parse1">parse error</a> ; nothing is returned. Otherwise, if the next character is a U+003B SEMICOLON, consume that too. If it isn't, there is a <a href="#parse1">parse error</a> . If one or more characters match the range, then take them all and interpret the string of characters as a number (either hexadecimal or decimal as appropriate). If that number is one of the numbers in the first column of the following table, then this is a <a href="#parse1">parse error</a> . Find the row with that number in the first column, and return a character token for the Unicode character given in the second column of that row. <table> <thead> <tr> <th>Number</th> <th colspan="2">Unicode character</th> </tr> </thead> <tbody> <tr> <td>0x0D</td> <td>U+000A</td> <td>LINE FEED (LF)</td> </tr> <tr> <td>0x80</td> <td>U+20AC</td> <td>EURO SIGN ('€')</td> </tr> <tr> <td>0x81</td> <td>U+FFFD</td> <td>REPLACEMENT CHARACTER</td> </tr> <tr> <td>0x82</td> <td>U+201A</td> <td>SINGLE LOW-9 QUOTATION MARK ('‚')</td> </tr> <tr> <td>0x83</td> <td>U+0192</td> <td>LATIN SMALL LETTER F WITH HOOK ('ƒ')</td> </tr> <tr> <td>0x84</td> <td>U+201E</td> <td>DOUBLE LOW-9 QUOTATION MARK ('„')</td> </tr> <tr> <td>0x85</td> <td>U+2026</td> <td>HORIZONTAL ELLIPSIS ('…')</td> </tr> <tr> <td>0x86</td> <td>U+2020</td> <td>DAGGER ('†')</td> </tr> <tr> <td>0x87</td> <td>U+2021</td> <td>DOUBLE DAGGER ('‡')</td> </tr> <tr> <td>0x88</td> <td>U+02C6</td> <td>MODIFIER LETTER CIRCUMFLEX ACCENT ('ˆ')</td> </tr> <tr> <td>0x89</td> <td>U+2030</td> <td>PER MILLE SIGN ('‰')</td> </tr> <tr> <td>0x8A</td> <td>U+0160</td> <td>LATIN CAPITAL LETTER S WITH CARON ('Š')</td> </tr> <tr> <td>0x8B</td> <td>U+2039</td> <td>SINGLE LEFT-POINTING ANGLE QUOTATION MARK ('‹')</td> </tr> <tr> <td>0x8C</td> <td>U+0152</td> <td>LATIN CAPITAL LIGATURE OE ('Œ')</td> </tr> <tr> <td>0x8D</td> <td>U+FFFD</td> <td>REPLACEMENT CHARACTER</td> </tr> <tr> <td>0x8E</td> <td>U+017D</td> <td>LATIN CAPITAL LETTER Z WITH CARON ('Ž')</td> </tr> <tr> <td>0x8F</td> <td>U+FFFD</td> <td>REPLACEMENT CHARACTER</td> </tr> <tr> <td>0x90</td> <td>U+FFFD</td> <td>REPLACEMENT CHARACTER</td> </tr> <tr> <td>0x91</td> <td>U+2018</td> <td>LEFT SINGLE QUOTATION MARK ('‘')</td> </tr> <tr> <td>0x92</td> <td>U+2019</td> <td>RIGHT SINGLE QUOTATION MARK ('’')</td> </tr> <tr> <td>0x93</td> <td>U+201C</td> <td>LEFT DOUBLE QUOTATION MARK ('“')</td> </tr> <tr> <td>0x94</td> <td>U+201D</td> <td>RIGHT DOUBLE QUOTATION MARK ('”')</td> </tr> <tr> <td>0x95</td> <td>U+2022</td> <td>BULLET ('•')</td> </tr> <tr> <td>0x96</td> <td>U+2013</td> <td>EN DASH ('–')</td> </tr> <tr> <td>0x97</td> <td>U+2014</td> <td>EM DASH ('—')</td> </tr> <tr> <td>0x98</td> <td>U+02DC</td> <td>SMALL TILDE ('˜')</td> </tr> <tr> <td>0x99</td> <td>U+2122</td> <td>TRADE MARK SIGN ('™')</td> </tr> <tr> <td>0x9A</td> <td>U+0161</td> <td>LATIN SMALL LETTER S WITH CARON ('š')</td> </tr> <tr> <td>0x9B</td> <td>U+203A</td> <td>SINGLE RIGHT-POINTING ANGLE QUOTATION MARK ('›')</td> </tr> <tr> <td>0x9C</td> <td>U+0153</td> <td>LATIN SMALL LIGATURE OE ('œ')</td> </tr> <tr> <td>0x9D</td> <td>U+FFFD</td> <td>REPLACEMENT CHARACTER</td> </tr> <tr> <td>0x9E</td> <td>U+017E</td> <td>LATIN SMALL LETTER Z WITH CARON ('ž')</td> </tr> <tr> <td>0x9F</td> <td>U+0178</td> <td>LATIN CAPITAL LETTER Y WITH DIAERESIS ('Ÿ')</td> </tr> </tbody> </table> Otherwise, if the number is <del class="diff-old">zero, if the number is higher than 0x10FFFF, or if it's one of the surrogate characters (characters</del> in the range <ins class= "diff-new">0x0000 to 0x0008, 0x000E to 0x001F, 0x007F to 0x009F,</ins> 0xD800 to <del class="diff-old">0xDFFF),</del> <ins class="diff-chg">0xDFFF , 0xFDD0 to 0xFDDF, or is one of 0xFFFE, 0xFFFF, 0x1FFFE, 0x1FFFF, 0x2FFFE, 0x2FFFF, 0x3FFFE, 0x3FFFF, 0x4FFFE, 0x4FFFF, 0x5FFFE, 0x5FFFF, 0x6FFFE, 0x6FFFF, 0x7FFFE, 0x7FFFF, 0x8FFFE, 0x8FFFF, 0x9FFFE, 0x9FFFF, 0xAFFFE, 0xAFFFF, 0xBFFFE, 0xBFFFF, 0xCFFFE, 0xCFFFF, 0xDFFFE, 0xDFFFF, 0xEFFFE, 0xEFFFF, 0xFFFFE, 0xFFFFF, 0x10FFFE, or 0x10FFFF, or is higher than 0x10FFFF,</ins> then this is a <a href="#parse1">parse error</a> ; return a character token for the U+FFFD REPLACEMENT CHARACTER character instead. Otherwise, return a character token for the Unicode character whose code point is that number. </dd> <dt>Anything else</dt> <dd> Consume the maximum number of characters possible, with the consumed characters case-sensitively matching one of the identifiers in the first column of the <del class= "diff-old">entities</del> <a href="#named0"><ins class= "diff-chg">named character references</ins></a> table. If no match can be made, then this is a <a href="#parse1">parse error</a> . No characters are consumed, and nothing is returned. If the last character matched is not a U+003B SEMICOLON ( <code title="">;</code> ), there is a <a href="#parse1">parse error</a> . If the <del class="diff-old">entity</del> <ins class= "diff-chg">character reference</ins> is being consumed <a href= "#character5" title= "character reference in attribute value state">as part of an attribute</a> , and the last character matched is not a U+003B SEMICOLON ( <code title="">;</code> ), and the next character is in the range U+0030 DIGIT ZERO to U+0039 DIGIT NINE, U+0041 LATIN CAPITAL LETTER A to U+005A LATIN CAPITAL LETTER Z, or U+0061 LATIN SMALL LETTER A to U+007A LATIN SMALL LETTER Z, then, for historical reasons, all the characters that were matched after the U+0026 AMPERSAND (&) must be unconsumed, and nothing is returned. Otherwise, return a character token for the character corresponding to the <del class="diff-old">entity</del> <ins class= "diff-chg">character reference</ins> name (as given by the second column of the <del class="diff-old">entities</del> <a href= "#named0"><ins class="diff-chg">named character references</ins></a> table). <div class="example"> If the markup contains <code title="">I'm &notit; I tell you</code> , the <del class="diff-old">entity</del> <ins class= "diff-chg">character reference</ins> is parsed as "not", as in, <code title="">I'm ¬it; I tell you</code> . But if the markup was <code title="">I'm &notin; I tell you</code> , the <del class= "diff-old">entity</del> <ins class="diff-chg">character reference</ins> would be parsed as "notin;", resulting in <code title="">I'm ∉ I tell you</code> . </div> </dd> </dl> <h4 id="tree-construction"><del class= "diff-old">8.2.4.</del> <ins class="diff-chg">8.2.5</ins> <dfn id="tree-construction0">Tree construction</dfn></h4> The input to the tree construction stage is a sequence of tokens from the <a href="#tokenisation0">tokenisation</a> stage. The tree construction stage is associated with a DOM <code>Document</code> object when a parser is created. The "output" of this stage consists of dynamically modifying or extending that document's DOM tree. <del class="diff-old">Tree construction passes through several phases. Initially, UAs must act according to the steps described as being those of the initial phase .</del> This specification does not define when an interactive user agent has to render the <code>Document</code> <ins class="diff-new">so that it is</ins> available to the user, or when it has to begin accepting user input. <ins class="diff-new">As each token is emitted from the tokeniser, the user agent must process the token according to the rules given in the section corresponding to the current</ins> <ins class="diff-new">insertion mode</ins> . When the steps below require the UA to <del class= "diff-old">append</del> <dfn id="insert"><ins class= "diff-chg">insert</ins> a character</dfn> <del class= "diff-old">to</del> <ins class="diff-chg">into</ins> a node, <ins class="diff-new">if that node has a child immediately before where</ins> the <del class="diff-old">UA must collect it</del> <ins class="diff-chg">character is to be inserted,</ins> and <del class="diff-old">all subsequent consecutive characters</del> that <del class="diff-old">would</del> <ins class="diff-chg">child is a</ins> <code><ins class="diff-chg">Text</ins></code> <ins class="diff-chg">node, then the character must</ins> be appended to that <del class="diff-old">node, and insert one</del> <code><ins class="diff-chg">Text</ins></code> <ins class= "diff-chg">node; otherwise, a new</ins> <code>Text</code> node whose data is <ins class="diff-new">just that character must be inserted in</ins> the <del class="diff-old">concatenation of all those characters.</del> <ins class="diff-chg">appropriate place.</ins> DOM mutation events must not fire for changes caused by the UA parsing the document. (Conceptually, the parser is not mutating the DOM, it is constructing it.) This includes the parsing of any content inserted using <code title= "dom-document-write-HTML"><a href= "#document.write...">document.write()</a></code> and <code title= "dom-document-writeln"><a href= "#document.writeln...">document.writeln()</a></code> calls. <a href="#references">[DOM3EVENTS]</a> Not all of the tag names mentioned below are conformant tag names in this specification; many are included to handle legacy content. They still form part of the algorithm that implementations are required to implement to claim conformance. The algorithm described below places no limit on the depth of the DOM tree generated, or on the length of tag names, attribute names, attribute values, text nodes, etc. While <del class="diff-old">implementators</del> <ins class= "diff-chg">implementors</ins> are encouraged to avoid arbitrary limits, it is <del class="diff-old">recognised</del> <ins class= "diff-chg">recognized</ins> that <a href= "#hardwareLimitations">practical concerns</a> will likely force user agents to impose nesting depths. <h5 id="creating"><del class= "diff-old">8.2.4.1.</del> <ins class= "diff-chg">8.2.5.1.</ins> <ins class="diff-new">Creating and inserting elements</ins></h5> <ins class="diff-new">When the steps below require the UA to</ins> <dfn id="create" title= "create an element for the token"><ins class="diff-new">create an element for a token</ins></dfn> <ins class="diff-new">in a particular namespace, the UA must create a node implementing the interface appropriate for the element type corresponding to the tag name of the token in the given namespace (as given in the specification that defines that element, e.g. for an</ins> <code><a href="#a"><ins class="diff-chg">a</ins></a></code> <ins class="diff-chg">element in the</ins> <a href= "#html-namespace0"><ins class="diff-chg">HTML namespace</ins></a> ,<ins class="diff-chg">this specification defines it to be the</ins> <code><a href="#htmlanchorelement"><ins class= "diff-chg">HTMLAnchorElement</ins></a></code> <ins class= "diff-chg">interface), with the tag name being the name of that element, with the node being in the given namespace, and with the attributes on the node being those given in the given token.</ins> The <del class="diff-old">initial phase</del> <ins class= "diff-chg">interface appropriate for an element in the</ins> <a href="#html-namespace0"><ins class="diff-chg">HTML namespace</ins></a> <ins class="diff-chg">that is not defined in this specification is</ins> <code><a href= "#htmlelement"><ins class="diff-chg">HTMLElement</ins></a></code> .<ins class="diff-chg">The interface appropriate for an element in another namespace that is not defined by that namespace's specification is</ins> <code><ins class= "diff-chg">Element</ins></code> . <ins class="diff-chg">When the steps below require the UA to</ins> <dfn id="insert0"><ins class="diff-chg">insert an HTML element</ins></dfn> <ins class="diff-new">for a token, the UA must first</ins> <a href="#create"><ins class="diff-new">create an element for the token</ins></a> <ins class="diff-new">in the</ins> <a href="#html-namespace0"><ins class="diff-new">HTML namespace</ins></a> ,<ins class="diff-new">and then append this node to the</ins> <a href="#current5"><ins class="diff-new">current node</ins></a> ,<ins class="diff-new">and push it onto the</ins> <a href="#stack"><ins class="diff-new">stack of open elements</ins></a> <ins class="diff-new">so that it is the new</ins> <a href="#current5"><ins class="diff-new">current node</ins></a> . <ins class="diff-new">The steps below may also require that the UA insert an HTML element in a particular place, in which case the UA must follow the same steps except that it must insert or append the new node in the location specified instead of appending it to the</ins> <a href="#current5"><ins class="diff-new">current node</ins></a> .<ins class="diff-new">(This happens in particular during the parsing of tables with invalid content.)</ins> <ins class="diff-new">When the steps below require the UA to</ins> <dfn id="insert1"><ins class="diff-new">insert a foreign element</ins></dfn> <ins class="diff-new">for a token, the UA must first</ins> <a href="#create"><ins class="diff-new">create an element for the token</ins></a> <ins class="diff-new">in the given namespace, and then append this node to the</ins> <a href= "#current5"><ins class="diff-new">current node</ins></a> ,<ins class="diff-new">and push it onto the</ins> <a href= "#stack"><ins class="diff-new">stack of open elements</ins></a> <ins class="diff-new">so that it is the new</ins> <a href= "#current5"><ins class="diff-new">current node</ins></a> .<ins class="diff-new">If the newly created element has an</ins> <code title=""><ins class="diff-new">xmlns</ins></code> <ins class= "diff-new">attribute in the</ins> <a href="#xmlns"><ins class= "diff-new">XMLNS namespace</ins></a> <ins class="diff-new">whose value is not exactly the same as the element's namespace, that is a</ins> <a href="#parse1"><ins class="diff-new">parse error</ins></a> . <ins class="diff-new">When the steps below require the user agent to</ins> <dfn id="adjust"><ins class="diff-new">adjust foreign attributes</ins></dfn> <ins class="diff-new">for a token, then, if any of the attributes on the token match the strings given in the first column of the following table, let the attribute be a namespaced attribute, with the prefix being the string given in the corresponding cell in the second column, the local name being the string given in the corresponding cell in the third column, and the namespace being the namespace given in the corresponding cell in the fourth column. (This fixes the use of namespaced attributes, in particular</ins> <code title=""><ins class= "diff-new">xml:lang</ins></code> .) <table> <thead> <tr> <th><ins class="diff-new">Attribute name</ins></th> <th><ins class="diff-new">Prefix</ins></th> <th><ins class="diff-new">Local name</ins></th> <th><ins class="diff-new">Namespace</ins></th> </tr> </thead> <tbody> <tr> <td><code title=""><ins class= "diff-new">xlink:actuate</ins></code></td> <td><code title=""><ins class="diff-new">xlink</ins></code></td> <td><code title=""><ins class="diff-new">actuate</ins></code></td> <td><a href="#xlink"><ins class="diff-new">XLink namespace</ins></a></td> </tr> <tr> <td><code title=""><ins class= "diff-new">xlink:arcrole</ins></code></td> <td><code title=""><ins class="diff-new">xlink</ins></code></td> <td><code title=""><ins class="diff-new">arcrole</ins></code></td> <td><a href="#xlink"><ins class="diff-new">XLink namespace</ins></a></td> </tr> <tr> <td><code title=""><ins class= "diff-new">xlink:href</ins></code></td> <td><code title=""><ins class="diff-new">xlink</ins></code></td> <td><code title=""><ins class="diff-new">href</ins></code></td> <td><a href="#xlink"><ins class="diff-new">XLink namespace</ins></a></td> </tr> <tr> <td><code title=""><ins class= "diff-new">xlink:role</ins></code></td> <td><code title=""><ins class="diff-new">xlink</ins></code></td> <td><code title=""><ins class="diff-new">role</ins></code></td> <td><a href="#xlink"><ins class="diff-new">XLink namespace</ins></a></td> </tr> <tr> <td><code title=""><ins class= "diff-new">xlink:show</ins></code></td> <td><code title=""><ins class="diff-new">xlink</ins></code></td> <td><code title=""><ins class="diff-new">show</ins></code></td> <td><a href="#xlink"><ins class="diff-new">XLink namespace</ins></a></td> </tr> <tr> <td><code title=""><ins class= "diff-new">xlink:title</ins></code></td> <td><code title=""><ins class="diff-new">xlink</ins></code></td> <td><code title=""><ins class="diff-new">title</ins></code></td> <td><a href="#xlink"><ins class="diff-new">XLink namespace</ins></a></td> </tr> <tr> <td><code title=""><ins class= "diff-new">xlink:type</ins></code></td> <td><code title=""><ins class="diff-new">xlink</ins></code></td> <td><code title=""><ins class="diff-new">type</ins></code></td> <td><a href="#xlink"><ins class="diff-new">XLink namespace</ins></a></td> </tr> <tr> <td><code title=""><ins class="diff-new">xml:base</ins></code></td> <td><code title=""><ins class="diff-new">xml</ins></code></td> <td><code title=""><ins class="diff-new">base</ins></code></td> <td><a href="#xml-namespace"><ins class="diff-new">XML namespace</ins></a></td> </tr> <tr> <td><code title=""><ins class="diff-new">xml:lang</ins></code></td> <td><code title=""><ins class="diff-new">xml</ins></code></td> <td><code title=""><ins class="diff-new">lang</ins></code></td> <td><a href="#xml-namespace"><ins class="diff-new">XML namespace</ins></a></td> </tr> <tr> <td><code title=""><ins class= "diff-new">xml:space</ins></code></td> <td><code title=""><ins class="diff-new">xml</ins></code></td> <td><code title=""><ins class="diff-new">space</ins></code></td> <td><a href="#xml-namespace"><ins class="diff-new">XML namespace</ins></a></td> </tr> <tr> <td><code title=""><ins class="diff-new">xmlns</ins></code></td> <td><ins class="diff-new">(none)</ins></td> <td><code title=""><ins class="diff-new">xmlns</ins></code></td> <td><a href="#xmlns"><ins class="diff-new">XMLNS namespace</ins></a></td> </tr> <tr> <td><code title=""><ins class= "diff-new">xmlns:xlink</ins></code></td> <td><code title=""><ins class="diff-new">xmlns</ins></code></td> <td><code title=""><ins class="diff-new">xlink</ins></code></td> <td><a href="#xmlns"><ins class="diff-new">XMLNS namespace</ins></a></td> </tr> </tbody> </table> <ins class="diff-new">The</ins> <dfn id="generic"><ins class= "diff-new">generic CDATA parsing algorithm</ins></dfn> <ins class= "diff-new">and the</ins> <dfn id="generic0"><ins class= "diff-new">generic RCDATA parsing algorithm</ins></dfn> <ins class= "diff-new">consist of the following steps. These algorithms are always invoked in response to a start tag token.</ins> <ol> <li> <a href="#create"><ins class="diff-new">Create an element for the token</ins></a> <ins class="diff-new">in the</ins> <a href= "#html-namespace0"><ins class="diff-new">HTML namespace</ins></a> . </li> <li> <ins class="diff-new">Append the new element to the</ins> <a href="#current5"><ins class="diff-new">current node</ins></a> . </li> <li> <ins class="diff-new">If the algorithm that was invoked is the</ins> <a href="#generic"><ins class="diff-new">generic CDATA parsing algorithm</ins></a> ,<ins class="diff-new">switch the tokeniser's</ins> <a href="#content2"><ins class="diff-new">content model flag</ins></a> <ins class="diff-new">to the CDATA state; otherwise the algorithm invoked was the</ins> <a href= "#generic0"><ins class="diff-new">generic RCDATA parsing algorithm</ins></a> ,<ins class="diff-new">switch the tokeniser's</ins> <a href="#content2"><ins class="diff-new">content model flag</ins></a> <ins class="diff-new">to the RCDATA state.</ins> </li> <li> <ins class="diff-new">Then, collect all the character tokens that the tokeniser returns until it returns a token that is not a character token, or until it stops tokenising.</ins> </li> <li> <ins class="diff-new">If this process resulted in a collection of character tokens, append a single</ins> <code><ins class= "diff-new">Text</ins></code> <ins class="diff-new">node, whose contents is the concatenation of all those tokens' characters, to the new element node.</ins> </li> <li> <ins class="diff-new">The tokeniser's</ins> <a href= "#content2"><ins class="diff-new">content model flag</ins></a> <ins class="diff-new">will have switched back to the PCDATA state.</ins> </li> <li> <ins class="diff-new">If the next token is an end tag token with the same tag name as the start tag token, ignore it. Otherwise, it's an end-of-file token, and this is a</ins> <a href= "#parse1"><ins class="diff-new">parse error</ins></a> . </li> </ol> <h5 id="closing"><ins class= "diff-new">8.2.5.2.</ins> <ins class="diff-new">Closing elements that have implied end tags</ins></h5> <del class="diff-old">Initially,</del> <ins class= "diff-chg">When</ins> the <del class="diff-old">tree construction stage</del> <ins class="diff-chg">steps below require the UA to</ins> <dfn id="generate"><ins class="diff-chg">generate implied end tags</ins></dfn> ,<ins class="diff-chg">then, while the</ins> <a href="#current5"><ins class="diff-chg">current node</ins></a> <ins class="diff-chg">is a</ins> <code><a href="#dd"><ins class= "diff-chg">dd</ins></a></code> <ins class="diff-chg">element, a</ins> <code><a href="#dt"><ins class= "diff-chg">dt</ins></a></code> <ins class="diff-chg">element, an</ins> <code><a href="#li"><ins class= "diff-chg">li</ins></a></code> <ins class="diff-chg">element, an</ins> <code><ins class="diff-chg">option</ins></code> <ins class="diff-chg">element, an</ins> <code><ins class= "diff-chg">optgroup</ins></code> <ins class="diff-chg">element, a</ins> <code><a href="#p"><ins class="diff-chg">p</ins></a></code> <ins class="diff-chg">element, an</ins> <code><a href= "#rp"><ins class="diff-chg">rp</ins></a></code> <ins class= "diff-chg">element, or an</ins> <code><a href="#rt"><ins class= "diff-chg">rt</ins></a></code> <ins class="diff-chg">element, the UA</ins> must <del class="diff-old">handle each token emitted</del> <ins class="diff-chg">pop the</ins> <a href="#current5"><ins class= "diff-chg">current node</ins></a> <ins class="diff-chg">off the</ins> <a href="#stack"><ins class="diff-chg">stack of open elements</ins></a> . <ins class="diff-chg">If a step requires the UA to generate implied end tags but lists an element to exclude</ins> from the <del class="diff-old">tokenisation</del> <ins class= "diff-chg">process, then the UA must perform the above steps as if that element was not in the above list.</ins> <h5 id="foster"><ins class= "diff-chg">8.2.5.3.</ins> <ins class="diff-chg">Foster parenting</ins></h5> <ins class="diff-chg">Foster parenting happens when content is misnested in tables.</ins> <ins class="diff-chg">When a node</ins> <var title= ""><ins class="diff-chg">node</ins></var> <ins class="diff-chg">is to be</ins> <dfn id="foster0" title="foster parent"><ins class= "diff-chg">foster parented</ins></dfn> ,<ins class="diff-chg">the node</ins> <var title=""><ins class="diff-chg">node</ins></var> <ins class="diff-chg">must be inserted into the</ins> <a href= "#foster1"><ins class="diff-chg">foster parent element</ins></a> <del class="diff-old">stage</del> , <ins class="diff-chg">and the</ins> <a href="#current6"><ins class="diff-chg">current table</ins></a> <ins class="diff-chg">must be marked as</ins> <dfn id="tainted"><ins class="diff-chg">tainted</ins></dfn> .<ins class="diff-chg">(Once the</ins> <a href= "#current6"><ins class="diff-chg">current table</ins></a> <ins class="diff-chg">has been</ins> <a href="#tainted"><ins class= "diff-chg">tainted</ins></a> ,<ins class="diff-chg">whitespace characters are inserted into the</ins> <a href= "#foster1"><ins class="diff-chg">foster parent element</ins></a> <ins class="diff-chg">instead of the</ins> <a href="#current5"><ins class="diff-chg">current node</ins></a> .) <ins class="diff-chg">The</ins> <dfn id="foster1"><ins class= "diff-chg">foster parent element</ins></dfn> <ins class= "diff-chg">is the parent element of the last</ins> <code><a href= "#table"><ins class="diff-chg">table</ins></a></code> <ins class= "diff-chg">element in the</ins> <a href="#stack"><ins class= "diff-chg">stack of open elements</ins></a> ,<ins class= "diff-chg">if there is a</ins> <code><a href="#table"><ins class= "diff-chg">table</ins></a></code> <ins class="diff-chg">element and it has such a parent element. If there is no</ins> <code><a href= "#table"><ins class="diff-chg">table</ins></a></code> <ins class= "diff-chg">element in the</ins> <a href="#stack"><ins class= "diff-chg">stack of open elements</ins></a> <ins class= "diff-chg">(</ins> <a href="#fragment"><ins class= "diff-chg">fragment case</ins></a> <ins class="diff-chg">), then the</ins> <a href="#foster1"><ins class="diff-chg">foster parent element</ins></a> <ins class="diff-chg">is the first element in the</ins> <a href="#stack"><ins class="diff-chg">stack of open elements</ins></a> <ins class="diff-chg">(the</ins> <code><a href="#html"><ins class="diff-chg">html</ins></a></code> <ins class="diff-chg">element). Otherwise, if there is a</ins> <code><a href="#table"><ins class="diff-chg">table</ins></a></code> <ins class="diff-chg">element in the</ins> <a href= "#stack"><ins class="diff-chg">stack of open elements</ins></a> ,<ins class="diff-chg">but the last</ins> <code><a href= "#table"><ins class="diff-chg">table</ins></a></code> <ins class= "diff-chg">element in the</ins> <a href="#stack"><ins class= "diff-chg">stack of open elements</ins></a> <ins class= "diff-chg">has no parent, or its parent node is not an element, then the</ins> <a href="#foster1"><ins class="diff-chg">foster parent element</ins></a> <ins class="diff-chg">is the element before the last</ins> <code><a href="#table"><ins class= "diff-chg">table</ins></a></code> <ins class="diff-chg">element in the</ins> <a href="#stack"><ins class="diff-chg">stack of open elements</ins></a> . <ins class="diff-chg">If the</ins> <a href= "#foster1"><ins class="diff-chg">foster parent element</ins></a> <ins class="diff-chg">is the parent element of the last</ins> <code><a href="#table"><ins class= "diff-chg">table</ins></a></code> <ins class="diff-chg">element in the</ins> <a href="#stack"><ins class="diff-chg">stack of open elements</ins></a> ,<ins class="diff-chg">then</ins> <var title= ""><ins class="diff-chg">node</ins></var> <ins class= "diff-chg">must be inserted immediately</ins> <ins class= "diff-chg">before</ins> <ins class="diff-chg">the last</ins> <code><a href="#table"><ins class="diff-chg">table</ins></a></code> <ins class="diff-chg">element in the</ins> <a href= "#stack"><ins class="diff-chg">stack of open elements</ins></a> <ins class="diff-chg">in the</ins> <a href= "#foster1"><ins class="diff-chg">foster parent element</ins></a> <ins class="diff-chg">; otherwise,</ins> <var title=""><ins class="diff-chg">node</ins></var> <ins class= "diff-chg">must be</ins> <ins class= "diff-chg">appended</ins> <ins class="diff-chg">to the</ins> <a href="#foster1"><ins class="diff-chg">foster parent element</ins></a> . <h5 id="the-initial"><ins class= "diff-chg">8.2.5.4.</ins> <ins class="diff-chg">The "</ins> <dfn id="initial" title="insertion mode: initial"><ins class= "diff-chg">initial</ins></dfn> <ins class="diff-chg">" insertion mode</ins></h5> <ins class="diff-chg">When the</ins> <ins class= "diff-chg">insertion mode</ins> <ins class="diff-chg">is "</ins> <a href="#initial" title= "insertion mode: initial"><ins class="diff-chg">initial</ins></a> <ins class="diff-chg">", tokens must be handled</ins> as follows: <dl class="switch"> <dt>A character token that is one of one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</dt> <dd> Ignore the token. </dd> <dt>A comment token</dt> <dd> Append a <code>Comment</code> node to the <code>Document</code> object with the <code title="">data</code> attribute set to the data given in the comment token. </dd> <dt>A DOCTYPE token</dt> <dd> If the DOCTYPE token's <code title="">name</code> does not case-insensitively match the string " <code title="">HTML</code> ", or if the token's public identifier is not missing, or if the token's system identifier is not missing, then there is a <a href= "#parse1">parse error</a> . Conformance checkers may, instead of reporting this error, switch to a conformance checking mode for another language (e.g. based on the DOCTYPE token a conformance checker could <del class="diff-old">recognise</del> <ins class= "diff-chg">recognize</ins> that the document is an HTML4-era document, and defer to an HTML4 conformance checker.) Append a <code>DocumentType</code> node to the <code>Document</code> node, with the <code title="">name</code> attribute set to the name given in the DOCTYPE token; the <code title="">publicId</code> attribute set to the public identifier given in the DOCTYPE token, or the empty string if the public identifier was <del class="diff-old">not set;</del> <ins class="diff-chg">missing;</ins> the <code title= "">systemId</code> attribute set to the system identifier given in the DOCTYPE token, or the empty string if the system identifier was <del class="diff-old">not set;</del> <ins class= "diff-chg">missing;</ins> and the other attributes specific to <code>DocumentType</code> objects set to null and empty lists as appropriate. Associate the <code>DocumentType</code> node with the <code>Document</code> object so that it is returned as the value of the <code title="">doctype</code> attribute of the <code>Document</code> object. Then, if the DOCTYPE token matches one of the conditions in the following list, then set the document to <a href="#quirks">quirks mode</a> : <ul class="brief"> <li>The <del class="diff-old">correctness</del> <ins class= "diff-chg">force-quirks</ins> flag is set to <del class= "diff-old">incorrect</del> <ins class="diff-chg">on</ins> .</li> <li>The name is set to anything other than " <code title= "">HTML</code> ".</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">+//Silmaril//dtd html Pro v0r11 <del class= "diff-old">19970101//EN</del> <ins class= "diff-chg">19970101//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//AdvaSoft Ltd//DTD HTML 3.0 asWedit + <del class= "diff-old">extensions//EN</del> <ins class= "diff-chg">extensions//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//AS//DTD HTML 3.0 asWedit + <del class= "diff-old">extensions//EN</del> <ins class= "diff-chg">extensions//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML 2.0 Level <del class="diff-old">1//EN</del> <ins class="diff-chg">1//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML 2.0 Level <del class="diff-old">2//EN</del> <ins class="diff-chg">2//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML 2.0 Strict Level <del class= "diff-old">1//EN</del> <ins class="diff-chg">1//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML 2.0 Strict Level <del class= "diff-old">2//EN</del> <ins class="diff-chg">2//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML 2.0 <del class="diff-old">Strict//EN " The public identifier is set to: " -//IETF//DTD HTML 2.0//EN</del> <ins class="diff-chg">Strict//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML <del class="diff-old">2.1E//EN</del> <ins class="diff-chg">2.0//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML <del class="diff-old">3.0//EN</del> <ins class="diff-chg">2.1E//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML <del class="diff-old">3.0//EN//</del> <ins class="diff-chg">3.0//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML 3.2 <del class="diff-old">Final//EN " The public identifier is set to: " -//IETF//DTD HTML 3.2//EN " The public identifier is set to: " -//IETF//DTD HTML 3//EN " The public identifier is set to: " -//IETF//DTD HTML Level 0//EN " The public identifier is set to: " -//IETF//DTD HTML Level 0//EN//2.0 " The public identifier is set to: " -//IETF//DTD HTML Level 1//EN " The public identifier is set to: " -//IETF//DTD HTML Level 1//EN//2.0 " The public identifier is set to: " -//IETF//DTD HTML Level 2//EN " The public identifier is set to: " -//IETF//DTD HTML Level 2//EN//2.0</del> <ins class="diff-chg">Final//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML <del class="diff-old">Level 3//EN</del> <ins class="diff-chg">3.2//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML <del class="diff-old">Level 3//EN//3.0</del> <ins class="diff-chg">3//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML <del class="diff-old">Strict</del> Level <del class="diff-old">0//EN</del> <ins class= "diff-chg">0//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML <del class="diff-old">Strict</del> Level <del class="diff-old">0//EN//2.0</del> <ins class= "diff-chg">1//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML <del class="diff-old">Strict</del> Level <del class="diff-old">1//EN</del> <ins class= "diff-chg">2//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML <del class="diff-old">Strict</del> Level <del class="diff-old">1//EN//2.0</del> <ins class= "diff-chg">3//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML Strict Level <del class="diff-old">2//EN</del> <ins class="diff-chg">0//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML Strict Level <del class= "diff-old">2//EN//2.0</del> <ins class="diff-chg">1//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML Strict Level <del class="diff-old">3//EN</del> <ins class="diff-chg">2//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML Strict Level <del class="diff-old">3//EN//3.0 " The public identifier is set to: " -//IETF//DTD HTML Strict//EN " The public identifier is set to: " -//IETF//DTD HTML Strict//EN//2.0</del> <ins class="diff-chg">3//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD HTML <del class="diff-old">Strict//EN//3.0 " The public identifier is set to: " -//IETF//DTD HTML//EN " The public identifier is set to: " -//IETF//DTD HTML//EN//2.0</del> <ins class="diff-chg">Strict//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//IETF//DTD <del class="diff-old">HTML//EN//3.0</del> <ins class="diff-chg">HTML//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//Metrius//DTD Metrius <del class= "diff-old">Presentational//EN</del> <ins class= "diff-chg">Presentational//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//Microsoft//DTD Internet Explorer 2.0 HTML <del class= "diff-old">Strict//EN</del> <ins class= "diff-chg">Strict//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//Microsoft//DTD Internet Explorer 2.0 <del class= "diff-old">HTML//EN</del> <ins class="diff-chg">HTML//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//Microsoft//DTD Internet Explorer 2.0 <del class= "diff-old">Tables//EN</del> <ins class= "diff-chg">Tables//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//Microsoft//DTD Internet Explorer 3.0 HTML <del class= "diff-old">Strict//EN</del> <ins class= "diff-chg">Strict//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//Microsoft//DTD Internet Explorer 3.0 <del class= "diff-old">HTML//EN</del> <ins class="diff-chg">HTML//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//Microsoft//DTD Internet Explorer 3.0 <del class= "diff-old">Tables//EN</del> <ins class= "diff-chg">Tables//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//Netscape Comm. Corp.//DTD <del class= "diff-old">HTML//EN</del> <ins class="diff-chg">HTML//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//Netscape Comm. Corp.//DTD Strict <del class= "diff-old">HTML//EN</del> <ins class="diff-chg">HTML//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//O'Reilly and Associates//DTD HTML <del class= "diff-old">2.0//EN</del> <ins class="diff-chg">2.0//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//O'Reilly and Associates//DTD HTML Extended <del class= "diff-old">1.0//EN</del> <ins class="diff-chg">1.0//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with: "</ins> <code title= ""><ins class="diff-chg">-//O'Reilly and Associates//DTD HTML Extended Relaxed 1.0//</ins></code> <ins class= "diff-chg">"</ins></li> <li><ins class="diff-chg">The public identifier starts with: "</ins> <code title=""><ins class="diff-chg">-//SoftQuad Software//DTD HoTMetaL PRO 6.0::19990601::extensions to HTML 4.0//</ins></code> <ins class="diff-chg">"</ins></li> <li><ins class="diff-chg">The public identifier starts with: "</ins> <code title=""><ins class="diff-chg">-//SoftQuad//DTD HoTMetaL PRO 4.0::19971010::extensions to HTML 4.0//</ins></code> <ins class="diff-chg">"</ins></li> <li><ins class="diff-chg">The public identifier starts with:</ins> " <code title="">-//Spyglass//DTD HTML 2.0 <del class= "diff-old">Extended//EN</del> <ins class= "diff-chg">Extended//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//SQ//DTD HTML 2.0 HoTMetaL + <del class= "diff-old">extensions//EN</del> <ins class= "diff-chg">extensions//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title="">-//Sun Microsystems Corp.//DTD HotJava <del class= "diff-old">HTML//EN</del> <ins class="diff-chg">HTML//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title="">-//Sun Microsystems Corp.//DTD HotJava Strict <del class= "diff-old">HTML//EN</del> <ins class="diff-chg">HTML//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//W3C//DTD HTML 3 <del class="diff-old">1995-03-24//EN</del> <ins class="diff-chg">1995-03-24//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//W3C//DTD HTML 3.2 <del class="diff-old">Draft//EN</del> <ins class="diff-chg">Draft//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//W3C//DTD HTML 3.2 <del class="diff-old">Final//EN</del> <ins class="diff-chg">Final//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//W3C//DTD HTML <del class="diff-old">3.2//EN</del> <ins class= "diff-chg">3.2//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//W3C//DTD HTML 3.2S <del class="diff-old">Draft//EN</del> <ins class="diff-chg">Draft//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//W3C//DTD HTML 4.0 <del class="diff-old">Frameset//EN</del> <ins class="diff-chg">Frameset//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//W3C//DTD HTML 4.0 <del class= "diff-old">Transitional//EN</del> <ins class= "diff-chg">Transitional//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//W3C//DTD HTML Experimental <del class= "diff-old">19960712//EN</del> <ins class= "diff-chg">19960712//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//W3C//DTD HTML Experimental <del class= "diff-old">970421//EN</del> <ins class= "diff-chg">970421//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//W3C//DTD W3 <del class="diff-old">HTML//EN " The public identifier is set to: " -//W3O//DTD W3 HTML 3.0//EN</del> <ins class="diff-chg">HTML//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//W3O//DTD W3 HTML <del class="diff-old">3.0//EN//</del> <ins class="diff-chg">3.0//</ins></code> "</li> <li>The public identifier is set to: " <code title="">-//W3O//DTD W3 HTML Strict 3.0//EN//</code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//WebTechs//DTD Mozilla HTML <del class= "diff-old">2.0//EN</del> <ins class="diff-chg">2.0//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//WebTechs//DTD Mozilla <del class="diff-old">HTML//EN</del> <ins class="diff-chg">HTML//</ins></code> "</li> <li>The public identifier is set to: " <code title="">-/W3C/DTD HTML 4.0 Transitional/EN</code> "</li> <li>The public identifier is set to: " <code title="">HTML</code> "</li> <li>The system identifier is set to: " <code title= "">http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd</code> "</li> <li>The system identifier is missing and the public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title="">-//W3C//DTD HTML 4.01 <del class= "diff-old">Frameset//EN</del> <ins class= "diff-chg">Frameset//</ins></code> "</li> <li>The system identifier is missing and the public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title="">-//W3C//DTD HTML 4.01 <del class= "diff-old">Transitional//EN</del> <ins class= "diff-chg">Transitional//</ins></code> "</li> </ul> Otherwise, if the DOCTYPE token matches one of the conditions in the following list, then set the document to <a href= "#limited">limited quirks mode</a> : <ul class="brief"> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//W3C//DTD XHTML 1.0 <del class="diff-old">Frameset//EN</del> <ins class="diff-chg">Frameset//</ins></code> "</li> <li>The public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title= "">-//W3C//DTD XHTML 1.0 <del class= "diff-old">Transitional//EN</del> <ins class= "diff-chg">Transitional//</ins></code> "</li> <li>The system identifier is not missing and the public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title="">-//W3C//DTD HTML 4.01 <del class= "diff-old">Frameset//EN</del> <ins class= "diff-chg">Frameset//</ins></code> "</li> <li>The system identifier is not missing and the public identifier <del class="diff-old">is set to:</del> <ins class="diff-chg">starts with:</ins> " <code title="">-//W3C//DTD HTML 4.01 <del class= "diff-old">Transitional//EN</del> <ins class= "diff-chg">Transitional//</ins></code> "</li> </ul> The name, system identifier, and public identifier strings must be compared to the values given in the lists above in a case-insensitive manner. <ins class="diff-new">A system identifier whose value is the empty string is not considered missing for the purposes of the conditions above.</ins> Then, switch <del class="diff-old">to</del> the <del class= "diff-old">root element phase</del> <ins class= "diff-chg">insertion mode</ins> <ins class="diff-chg">to "</ins> <a href="#before4" title= "insertion mode: before html"><ins class="diff-chg">before html</ins></a> <del class="diff-old">of the tree construction stage.</del> <ins class="diff-chg">".</ins> </dd> <dt><del class="diff-old">A start tag token An end tag token A character token that is not one of one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE An end-of-file token</del> <ins class="diff-chg">Anything else</ins></dt> <dd> <a href="#parse1">Parse error</a> . Set the document to <a href="#quirks">quirks mode</a> . <del class="diff-old">Then, switch to</del> <ins class= "diff-chg">Switch</ins> the <del class="diff-old">root element phase</del> <ins class="diff-chg">insertion mode</ins> <ins class="diff-chg">to "</ins> <a href="#before4" title= "insertion mode: before html"><ins class="diff-chg">before html</ins></a> <del class="diff-old">of the tree construction stage and</del> <ins class="diff-chg">", then</ins> reprocess the current token. </dd> </dl> <h5 id="the-before"><del class= "diff-old">8.2.4.2.</del> <ins class= "diff-chg">8.2.5.5.</ins> The <del class="diff-old">root element phase</del> <ins class="diff-chg">"</ins> <dfn id="before4" title="insertion mode: before html"><ins class="diff-chg">before html</ins></dfn> <ins class="diff-chg">" insertion mode</ins></h5> <del class="diff-old">After</del> <ins class= "diff-chg">When</ins> the <del class="diff-old">initial phase , as each token</del> <ins class="diff-chg">insertion mode</ins> is <del class="diff-old">emitted from the tokenisation</del> <ins class="diff-chg">"</ins> <a href="#before4" title="insertion mode: before html"><ins class="diff-chg">before html</ins></a> <del class="diff-old">stage, it</del> <ins class= "diff-chg">", tokens</ins> must be <del class= "diff-old">processed</del> <ins class="diff-chg">handled</ins> as <del class="diff-old">described in this section.</del> <ins class= "diff-chg">follows:</ins> <dl class="switch"> <dt>A DOCTYPE token</dt> <dd> <a href="#parse1">Parse error</a> . Ignore the token. </dd> <dt>A comment token</dt> <dd> Append a <code>Comment</code> node to the <code>Document</code> object with the <code title="">data</code> attribute set to the data given in the comment token. </dd> <dt>A character token that is one of one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</dt> <dd> Ignore the token. </dd> <dt>A <del class="diff-old">character token that is not one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE A</del> start tag <del class="diff-old">token An end</del> <ins class= "diff-chg">whose</ins> tag <del class="diff-old">token An end-of-file token</del> <ins class="diff-chg">name is "html"</ins></dt> <dd><del class="diff-old">If</del> <a href="#create"><ins class="diff-chg">Create an element for</ins> the token <del class="diff-old">is a start tag token with</del></a> <ins class="diff-chg">in</ins> the <del class= "diff-old">tag name "html", and</del> <a href= "#html-namespace0"><ins class="diff-chg">HTML namespace</ins></a> .<ins class="diff-chg">Append</ins> it <ins class="diff-new">to the</ins> <code><ins class="diff-new">Document</ins></code> <ins class="diff-new">object. Put this element in the</ins> <a href="#stack"><ins class="diff-new">stack of open elements</ins></a> . <ins class="diff-new">If the token</ins> has an attribute <del class="diff-old">"application",</del> <ins class="diff-chg">"manifest",</ins> then run the <a href= "#application2" title= "concept-appcache-init-with-attribute">application cache selection algorithm</a> with the value of that attribute as the manifest <del class="diff-old">URI.</del> <ins class="diff-chg">URI, resolving relative URIs according to section 5.1 of RFC3986 as if there was no base URI embedded in content (i.e. relative to the base URI from the encapsulating entity or the URI used to retrieve the entity).</ins> Otherwise, run the <a href="#application3" title="concept-appcache-init-no-attribute">application cache selection algorithm</a> with no manifest. <a href= "#references"><ins class="diff-new">[RFC3986]</ins></a> <ins class="diff-new">Switch the</ins> <ins class= "diff-new">insertion mode</ins> <ins class="diff-new">to "</ins> <a href="#before5" title= "insertion mode: before head"><ins class="diff-new">before head</ins></a> <ins class="diff-new">".</ins> </dd> <dt><ins class="diff-new">Anything else</ins></dt> <dd> Create an <code><a href="#htmlelement">HTMLElement</a></code> node with the tag name <code><a href="#html">html</a></code> , in the <a href="#html-namespace0">HTML namespace</a> . Append it to the <code>Document</code> object. <ins class="diff-new">Put this element in the</ins> <a href="#stack"><ins class="diff-new">stack of open elements</ins></a> . <ins class="diff-new">Run the</ins> <a href="#application3" title="concept-appcache-init-no-attribute"><ins class= "diff-new">application cache selection algorithm</ins></a> <ins class="diff-new">with no manifest.</ins> Switch <del class="diff-old">to</del> the <del class= "diff-old">main phase</del> <ins class="diff-chg">insertion mode</ins> <ins class="diff-chg">to "</ins> <a href= "#before5" title="insertion mode: before head"><ins class= "diff-chg">before head</ins></a> <del class="diff-old">and</del> <ins class="diff-chg">", then</ins> reprocess the current token. Should probably make end tags be ignored, so that "</head> <!-- --> <html> " puts the comment before the root node (or should we?) </dd> </dl> The root element can end up being removed from the <code>Document</code> object, e.g. by scripts; nothing in particular happens in such cases, content continues being appended to the nodes as described in the next section. <del class= "diff-old">8.2.4.3. The main phase After the root element phase , each token emitted from the tokenisation stage must be processed as described in this section. This is by far the most involved part of parsing an HTML document. The tree construction stage in this phase has several pieces of state: a stack of open elements , a list of active formatting elements , a head element pointer , a form element pointer , and an insertion mode . We could just fold insertion modes and phases into one concept (and duplicate the two rules common to all insertion modes into all of them). 8.2.4.3.1. The stack of open elements Initially the stack of open elements contains just the html root element node created in the last phase before switching to this phase (or, in the fragment case , the html element created as part of that algorithm ). That's the topmost node of the stack. It never gets popped off the stack. (This stack grows downwards.) The current node is the bottommost node in this stack. Elements in the stack fall into the following categories: Special The following HTML elements have varying levels of special parsing rules: address , area , base , basefont , bgsound , blockquote , body , br , center , col , colgroup , dd , dir , div , dl , dt , embed , fieldset , form , frame , frameset , h1 , h2 , h3 , h4 , h5 , h6 , head , hr , iframe , image , img , input , isindex , li , link , listing , menu , meta , noembed , noframes , noscript , ol , optgroup , option , p , param , plaintext , pre , script , select , spacer , style , tbody , textarea , tfoot , thead , title , tr , ul , and wbr . Scoping The following HTML elements introduce new scopes for various parts of the parsing: button , caption , html , marquee , object , table , td and th . Formatting The following HTML elements are those that end up in the list of active formatting elements : a , b , big , em , font , i , nobr , s , small , strike , strong , tt , and u . Phrasing All other elements found while parsing an HTML document. Still need to add these new elements to the lists: event-source , section , nav , article , aside , header , footer , datagrid , command The stack of open elements is said to have an element in scope or have an element in table scope when the following algorithm terminates in a match state: Initialise node to be the current node (the bottommost node of the stack). If node is the target node, terminate in a match state. Otherwise, if node is a table element, terminate in a failure state. Otherwise, if the algorithm is the "has an element in scope" variant (rather than the "has an element in table scope" variant), and node is one of the following, terminate in a failure state: caption td th button marquee object Otherwise, if node is an html element, terminate in a failure state. (This can only happen if the node is the topmost node of the stack of open elements , and prevents the next step from being invoked if there are no more elements in the stack.) Otherwise, set node to the previous entry in the stack of open elements and return to step 2. (This will never fail, since the loop will always terminate in the previous step if the top of the stack is reached.) Nothing happens if at any time any of the elements in the stack of open elements are moved to a new location in, or removed from, the Document tree. In particular, the stack is not changed in this situation. This can cause, amongst other strange effects, content to be appended to nodes that are no longer in the DOM. In some cases (namely, when closing misnested formatting elements ), the stack is manipulated in a random-access fashion.</del> <h5 id="the-before0"><del class= "diff-old">8.2.4.3.2.</del> <ins class= "diff-chg">8.2.5.6.</ins> The <del class="diff-old">list of active formatting elements Initially the list of active formatting elements is empty. It is used to handle mis-nested formatting element tags . The list contains elements in the formatting category, and scope markers. The scope markers are inserted when entering buttons, object elements, marquees, table cells, and table captions, and are used to prevent formatting from "leaking" into tables, buttons, object elements, and marquees. When the steps below require the UA to reconstruct the active formatting elements , the UA must perform the following steps: If there are no entries in the list of active formatting elements , then there is nothing to reconstruct; stop this algorithm. If the last (most recently added) entry in the list of active formatting elements is a marker, or if it is an element that is in the stack of open elements , then there is nothing to reconstruct; stop this algorithm. Let entry be the last (most recently added) element in the list of active formatting elements . If there are no entries</del> <ins class= "diff-chg">"</ins> <dfn id="before5" title= "insertion mode: before head">before <del class="diff-old">entry in the list of active formatting elements , then jump to step 8. Let entry be the entry one earlier than entry in the list of active formatting elements . If entry is neither a marker nor an element that is also in the stack of open elements , go to step 4. Let entry be the element one later than entry in the list of active formatting elements . Perform a shallow clone of the element entry to obtain clone . [DOM3CORE] Append clone to the current node and push it onto the stack of open elements so that it is the new current node . Replace the entry for entry in the list with an entry for clone . If the entry for clone in the list of active formatting elements is not the last entry in the list, return to step 7. This has the effect of reopening all the formatting elements that were opened in the current body, cell, or caption (whichever is youngest) that haven't been explicitly closed. The way this specification is written, the list of active formatting elements always consists of elements in chronological order with the least recently added element first and the most recently added element last (except for while steps 8 to 11 of the above algorithm are being executed, of course). When the steps below require the UA to clear the list of active formatting elements up to the last marker , the UA must perform the following steps: Let entry be the last (most recently added) entry in the list of active formatting elements . Remove entry from the list of active formatting elements . If entry was a marker, then stop the algorithm at this point. The list has been cleared up to the last marker. Go to step 1. 8.2.4.3.3. Creating and inserting HTML elements When the steps below require the UA to create an element for a token , the UA must create a node implementing the interface appropriate for the element type corresponding to the tag name of the token (as given in the section of this specification that defines that element, e.g. for an a element it would be the HTMLAnchorElement interface), with the tag name being the name of that element, with the node being in the HTML namespace , and with the attributes on the node being those given in the given token. When the steps below require the UA to insert an HTML element for a token, the UA must first create an element for the token , and then append this node to the current node , and push it onto the stack of open elements so that it is the new current node . The steps below may also require that the UA insert an HTML element in a particular place, in which case the UA must create an element for the token and then insert or append the new node in the location specified. (This happens in particular during the parsing of tables with invalid content.) The interface appropriate for an element that is not defined in this specification is HTMLElement . The generic CDATA parsing algorithm and the generic RCDATA parsing algorithm consist of the following steps. These algorithms are always invoked in response to a start tag token, and are always passed a context node , typically the current node , which is used as the place to insert the resulting element node. Create an element for the token . Append the new element to the given context node . If the algorithm that was invoked is the generic CDATA parsing algorithm , switch the tokeniser's content model flag to the CDATA state; otherwise the algorithm invoked was the generic RCDATA parsing algorithm , switch the tokeniser's content model flag to the RCDATA state. Then, collect all the character tokens that the tokeniser returns until it returns a token that is not a character token, or until it stops tokenising. If this process resulted in a collection of character tokens, append a single Text node, whose contents is the concatenation of all those tokens' characters, to the new element node. The tokeniser's content model flag will have switched back to the PCDATA state. If the next token is an end tag token with the same tag name as the start tag token, ignore it. Otherwise, this is a parse error . 8.2.4.3.4. Closing elements that have implied end tags When the steps below require the UA to generate implied end tags , then, if the current node is a dd element, a dt element, an li element, a p element, a tbody element, a td element, a tfoot element, a th element, a thead element, a tr element, the UA must act as if an end tag with the respective tag name had been seen and then generate implied end tags again. The step that requires the UA to generate implied end tags but lists an element to exclude from the process, then the UA must perform the above steps as if that element was not in the above list. 8.2.4.3.5. The element pointers Initially the</del> head <del class="diff-old">element pointer</del></dfn> <del class="diff-old">and the form element pointer are both null. Once a head element has been parsed (whether implicitly or explicitly) the head element pointer gets set to point to this node. The form element pointer points to the last form element that was opened and whose end tag has not yet been seen. It is used to make form controls associate with forms in the face of dramatically bad markup, for historical reasons. 8.2.4.3.6. The insertion mode Initially the</del> <ins class= "diff-chg">"</ins> insertion mode <del class="diff-old">is " before head ". It can change to " in head ", " in head noscript ", " after head ", " in body ", " in table ", " in caption ", " in column group ", " in table body ", " in row ", " in cell ", " in select ", " after body ", " in frameset ", and " after frameset " during the course of the parsing, as described below. It affects how certain tokens are processed. If the tree construction stage is switched from the main phase to the trailing end phase and back again, the various pieces of state are not reset; the UA must act as if the state was maintained.</del></h5> When the <del class="diff-old">steps below require the UA to reset the insertion mode appropriately , it means the UA must follow these steps: Let last be false. Let node be the last node in the stack of open elements . If node is the first node in the stack of open elements, then set last to true. If the context element of the</del> <del class="diff-old">HTML fragment parsing algorithm is neither a td element nor a th element, then set node to the context element. ( fragment case ) If node is a select element, then switch the</del> insertion mode <del class= "diff-old">to " in select " and abort these steps. ( fragment case ) If node is a td or th element, then switch the insertion mode to " in cell " and abort these steps. If node is a tr element, then switch the insertion mode to " in row " and abort these steps. If node is a tbody , thead , or tfoot element, then switch the insertion mode to " in table body " and abort these steps. If node is a caption element, then switch the insertion mode to " in caption " and abort these steps. If node is a colgroup element, then switch the insertion mode to " in column group " and abort these steps. ( fragment case ) If node is a table element, then switch the insertion mode to " in table " and abort these steps. If node is a head element, then switch the insertion mode to " in body " (" in body "! not " in head " !) and abort these steps. ( fragment case ) If node is a body element, then switch the insertion mode to " in body " and abort these steps. If node is a frameset element, then switch the insertion mode to " in frameset " and abort these steps. ( fragment case ) If node is an html element, then: if the head element pointer</del> is <del class="diff-old">null, switch the insertion mode to</del> " <a href="#before5" title="insertion mode: before head">before head</a> ", <del class="diff-old">otherwise, switch the insertion mode to " after head ". In either case, abort these steps. ( fragment case ) If last is true, then set the insertion mode to " in body " and abort these steps. ( fragment case ) Let node now be the node before node in the stack of open elements . Return to step 3. 8.2.4.3.7. How to handle</del> tokens <del class="diff-old">in the main phase Tokens in the main phase</del> must be handled as follows: <dl class="switch"> <dt>A <del class="diff-old">DOCTYPE token Parse error . Ignore the token. A start tag whose tag name is "html" If this start tag token was not the first start tag token, then it is a parse error . For each attribute on the token, check to see if the attribute is already present on the top element of the stack of open elements . If it is not, add the attribute and its corresponding value to that element. An end-of-file token Generate implied end tags. If there are more than two nodes on the stack of open elements , or if there are two nodes but the second node is not a body node, this is a parse error . Otherwise, if the parser was originally created as part of the HTML fragment parsing algorithm , and there's more than one element in the stack of open elements , and the second node on the stack of open elements is not a body node, then this is a parse error . ( fragment case ) Stop parsing. This fails because it doesn't imply HEAD and BODY tags. We should probably expand out the insertion modes and merge them with phases and then put the three things here into each insertion mode instead of trying to factor them out so carefully. Anything else Depends on the insertion mode : If the insertion mode is " before head " Handle the token as follows: A</del> character token that is one of one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</dt> <dd> <del class="diff-old">Append the character to</del> <ins class= "diff-chg">Ignore</ins> the <del class="diff-old">current node .</del> <ins class="diff-chg">token.</ins> </dd> <dt>A comment token</dt> <dd> Append a <code>Comment</code> node to the <a href= "#current5">current node</a> with the <code title="">data</code> attribute set to the data given in the comment token. </dd> <dt>A <ins class="diff-new">DOCTYPE token</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Ignore the token.</ins> </dd> <dt><ins class="diff-new">A</ins> start tag whose tag name is <del class="diff-old">"head"</del> <ins class= "diff-chg">"html"</ins></dt> <dd> <del class="diff-old">Create an element for</del> <ins class= "diff-chg">Process</ins> the token <del class="diff-old">. Set the head element pointer to this new element node. Append the new element to</del> <a href="#using8"><ins class= "diff-chg">using</ins> the <del class="diff-old">current node</del> <ins class="diff-chg">rules for</ins></a> <del class="diff-old">and push it onto the stack of open elements . Change</del> the <del class="diff-old">insertion mode to</del> " <a href="#in-body" title="insertion mode: in body">in <del class="diff-old">head</del> <ins class="diff-chg">body</ins></a> <del class="diff-old">".</del> <ins class="diff-chg">"</ins> <ins class="diff-chg">insertion mode</ins> . </dd> <dt>A start tag <del class="diff-old">token</del> whose tag name is <del class="diff-old">one of: "base", "link", "meta", "script", "style", "title"</del> <ins class="diff-chg">"head"</ins></dt> <dd> <del class="diff-old">Act as if a start tag token with the tag name "head" and no attributes had been seen, then reprocess</del> <a href="#insert0"><ins class="diff-chg">Insert an HTML element</ins></a> <ins class="diff-chg">for</ins> the <del class= "diff-old">current</del> token. <del class="diff-old">This will result in a</del> <ins class="diff-chg">Set the</ins> <a href= "#head-element"><code title=""><ins class= "diff-chg">head</ins></code> <ins class="diff-chg">element pointer</ins></a> <ins class="diff-chg">to the newly created</ins> <code><a href="#head">head</a></code> <del class="diff-old">element being generated, and with the current token being reprocessed in</del> <ins class="diff-chg">element.</ins> <ins class="diff-chg">Switch</ins> the <ins class= "diff-new">insertion mode</ins> <ins class= "diff-new">to</ins> " <a href="#in-head" title= "insertion mode: in head">in head</a> <del class="diff-old">" insertion mode .</del> <ins class="diff-chg">".</ins> </dd> <dt>An end tag whose tag name is one of: "head", <del class= "diff-old">"body", "html", "p",</del> "br"</dt> <dd> Act as if a start tag token with the tag name "head" and no attributes had been seen, then reprocess the current token. </dd> <dt>Any other end tag</dt> <dd> <a href="#parse1">Parse error</a> . Ignore the token. <del class="diff-old">Do we really want to ignore end tags here? A character token that is not one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</del></dd> <dt><del class="diff-old">Any other start tag token</del> <ins class="diff-chg">Anything else</ins></dt> <dd> Act as if a start tag token with the tag name "head" and no attributes had been seen, then reprocess the current token. This will result in an empty <code><a href= "#head">head</a></code> element being generated, with the current token being reprocessed in the " <a href="#after4" title= "insertion mode: after head">after head</a> " insertion mode <del class="diff-old">.</del> . </dd> </dl> <del class="diff-old">If the insertion mode is</del> <h5 id="parsing-main-inhead"><ins class= "diff-chg">8.2.5.7.</ins> <ins class="diff-chg">The</ins> " <dfn id="in-head" title="insertion mode: in head">in head</dfn> " <ins class="diff-chg">insertion mode</ins></h5> <del class="diff-old">Handle</del> <ins class= "diff-chg">When</ins> the <del class="diff-old">token</del> <ins class="diff-chg">insertion mode</ins> <ins class= "diff-chg">is "</ins> <a href="#in-head" title= "insertion mode: in head"><ins class="diff-chg">in head</ins></a> <ins class="diff-chg">", tokens must be handled</ins> as <del class="diff-old">follows.</del> <ins class= "diff-chg">follows:</ins> <dl class="switch"> <dt>A character token that is one of one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</dt> <dd> <del class="diff-old">Append</del> <a href="#insert" title= "insert a character"><ins class="diff-chg">Insert</ins> the character</a> <del class="diff-old">to</del> <ins class= "diff-chg">into</ins> the <a href="#current5">current node</a> . </dd> <dt>A comment token</dt> <dd> Append a <code>Comment</code> node to the <a href= "#current5">current node</a> with the <code title="">data</code> attribute set to the data given in the comment token. </dd> <dt>A <ins class="diff-new">DOCTYPE token</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Ignore the token.</ins> </dd> <dt><ins class="diff-new">A start tag whose tag name is "html"</ins></dt> <dd> <ins class="diff-new">Process the token</ins> <a href= "#using8"><ins class="diff-new">using the rules for</ins></a> <ins class="diff-new">the "</ins> <a href="#in-body" title= "insertion mode: in body"><ins class="diff-new">in body</ins></a> <ins class="diff-new">"</ins> <ins class="diff-new">insertion mode</ins> . </dd> <dt><ins class="diff-new">A</ins> start tag whose tag name is one of: "base", <ins class="diff-new">"command", "event-source",</ins> "link"</dt> <dd> <a href="#insert0">Insert an HTML element</a> for the token. <ins class="diff-new">Immediately pop the</ins> <a href= "#current5"><ins class="diff-new">current node</ins></a> <ins class="diff-new">off the</ins> <a href="#stack"><ins class= "diff-new">stack of open elements</ins></a> . <a href="#acknowledged" title= "acknowledge self-closing flag"><ins class="diff-new">Acknowledge the token's</ins> <ins class="diff-new">self-closing flag</ins></a> ,<ins class="diff-new">if it is set.</ins> </dd> <dt>A start tag whose tag name is "meta"</dt> <dd> <a href="#insert0">Insert an HTML element</a> for the token. <ins class="diff-new">Immediately pop the</ins> <a href= "#current5"><ins class="diff-new">current node</ins></a> <ins class="diff-new">off the</ins> <a href="#stack"><ins class= "diff-new">stack of open elements</ins></a> . <a href="#acknowledged" title= "acknowledge self-closing flag"><ins class="diff-new">Acknowledge the token's</ins> <ins class="diff-new">self-closing flag</ins></a> ,<ins class="diff-new">if it is set.</ins> If the element has a <code title= "attr-meta-charset"><a href="#charset1">charset</a></code> attribute, and its value is a supported encoding, and the <a href= "#confidence" title="concept-encoding-confidence">confidence</a> is currently tentative , then <a href="#change">change the encoding</a> to the encoding given by the value of the <code title= "attr-meta-charset"><a href="#charset1">charset</a></code> attribute. Otherwise, if the element has a <code title= "attr-meta-charset"><a href="#charset1">content</a></code> attribute, and applying the <a href="#algorithm4">algorithm <del class="diff-old">to extract</del> <ins class="diff-chg">for extracting</ins> an encoding from a Content-Type</a> to its value returns a supported encoding <var title="">encoding</var> , and the <a href="#confidence" title= "concept-encoding-confidence">confidence</a> is currently tentative , then <a href="#change">change the encoding</a> to the encoding <var title="">encoding</var> . </dd> <dt>A start tag whose tag name is "title"</dt> <dd> Follow the <a href="#generic0">generic RCDATA parsing algorithm <del class="diff-old">, with the head element pointer as the context node , unless that's null, in which case use the current node ( fragment cose ).</del></a> . </dd> <dt>A start tag whose tag name is "noscript", if <ins class= "diff-new">the</ins> <a href="#scripting2">scripting <ins class= "diff-new">flag</ins></a> is enabled <del class= "diff-old">:</del></dt> <dt>A start tag whose tag name is <ins class="diff-new">one of: "noframes",</ins> "style"</dt> <dd> Follow the <a href="#generic">generic CDATA parsing algorithm <del class="diff-old">, with the current node as the context node .</del></a> . </dd> <dt>A start tag whose tag name is "noscript", if <ins class= "diff-chg">the</ins> <a href="#scripting2">scripting <ins class= "diff-new">flag</ins></a> is disabled <del class= "diff-old">:</del></dt> <dd> <a href="#insert0">Insert <del class="diff-old">a noscript</del> <ins class="diff-chg">an HTML</ins> element</a> for the token. <del class="diff-old">Change</del> <ins class= "diff-chg">Switch</ins> the insertion mode to " <a href="#in-head0" title="insertion mode: in head noscript">in head noscript</a> ". </dd> <dt id="scriptTag">A start tag whose tag name is "script"</dt> <dd> <a href="#create">Create an element for the token</a> <ins class="diff-new">in the</ins> <a href= "#html-namespace0"><ins class="diff-new">HTML namespace</ins></a> . Mark the element as being <a href= "#parser-inserted">"parser-inserted"</a> . This ensures that, if the script is external, any <code title= "dom-document-write-HTML"><a href= "#document.write...">document.write()</a></code> calls in the script will execute in-line, instead of blowing the document away, as would happen in most other cases. Switch the tokeniser's <a href="#content2">content model flag</a> to the CDATA state. Then, collect all the character tokens that the tokeniser returns until it returns a token that is not a character token, or until it stops tokenising. If this process resulted in a collection of character tokens, append a single <code>Text</code> node to the <code><a href= "#script1">script</a></code> element node whose contents is the concatenation of all those tokens' characters. The tokeniser's <a href="#content2">content model flag</a> will have switched back to the PCDATA state. If the next token is not an end tag token with the tag name "script", then this is a <a href="#parse1">parse error</a> ; mark the <code><a href="#script1">script</a></code> element as <a href= "#already">"already executed"</a> . Otherwise, the token is the <code><a href="#script1">script</a></code> element's end tag, so ignore it. If the parser was originally created for the <a href= "#html-fragment0">HTML fragment parsing algorithm</a> , then mark the <code><a href="#script1">script</a></code> element as <a href= "#already">"already executed"</a> , and skip the rest of the processing described for this token (including the part below where " <a href="#the-script" title= "the script that will execute as soon as the parser resumes">scripts that will execute as soon as the parser resumes</a> " are executed). ( <a href="#fragment">fragment case</a> ) Marking the <code><a href= "#script1">script</a></code> element as "already executed" prevents it from executing when it is inserted into the document a few paragraphs below. Thus, scripts missing their end tags and scripts that were inserted using <code title="dom-innerHTML-HTML"><a href= "#innerhtml0">innerHTML</a></code> aren't executed. Let the <var title="">old insertion point</var> have the same value as the current <a href="#insertion">insertion point</a> . Let the <a href="#insertion">insertion point</a> be just before the <a href="#next-input">next input character</a> . Append the new element to the <a href="#current5">current node</a> . <a href="#running" title="running a script">Special processing occurs when a <code>script</code> element is inserted into a document</a> that might cause some script to execute, which might cause <a href="#document.write..." title= "dom-document-write-HTML">new characters to be inserted into the tokeniser</a> . Let the <a href="#insertion">insertion point</a> have the value of the <var title="">old insertion point</var> . (In other words, restore the <a href="#insertion">insertion point</a> to the value it had before the previous paragraph. This value might be the "undefined" value.) At this stage, if there is <a href= "#the-script" title= "the script that will execute as soon as the parser resumes">a script that will execute as soon as the parser resumes</a> , then: <dl class="switch"> <dt>If the tree construction stage is <a href= "#nestedParsing">being called reentrantly</a> , say from a call to <code title="dom-document-write-HTML"><a href= "#document.write...">document.write()</a></code> :</dt> <dd> Abort the processing of any nested <del class= "diff-old">invokations</del> <ins class= "diff-chg">invocations</ins> of the tokeniser, yielding control back to the caller. (Tokenisation will resume when the caller returns to the "outer" tree construction stage.) </dd> <dt>Otherwise:</dt> <dd> Follow these steps: <ol> <li> Let <var title="">the script</var> be <a href="#the-script">the script that will execute as soon as the parser resumes</a> . There is no longer <a href="#the-script" title= "the script that will execute as soon as the parser resumes">a script that will execute as soon as the parser resumes</a> . </li> <li> <a href="#pause">Pause</a> until the script has completed loading . </li> <li> Let the <a href="#insertion">insertion point</a> be just before the <a href="#next-input">next input character</a> . </li> <li> <a href="#executing0" title="executing a script block">Execute the script</a> . </li> <li> Let the <a href="#insertion">insertion point</a> be undefined again. </li> <li> If there is once again <a href="#the-script" title= "the script that will execute as soon as the parser resumes">a script that will execute as soon as the parser resumes</a> , then repeat these steps from step 1. </li> </ol> </dd> </dl> </dd> <dt>An end tag whose tag name is "head"</dt> <dd> Pop the <a href="#current5">current node</a> (which will be the <code><a href="#head">head</a></code> element) off the <a href= "#stack">stack of open elements</a> . <del class="diff-old">Change</del> <ins class= "diff-chg">Switch</ins> the insertion mode to " <a href="#after4" title="insertion mode: after head">after head</a> ". </dd> <dt>An end tag whose tag name is <del class="diff-old">one of: "body", "html", "p",</del> "br"</dt> <dd> Act as described in the "anything else" entry below. </dd> <dt>A start tag whose tag name is "head"</dt> <dt>Any other end tag</dt> <dd> <a href="#parse1">Parse error</a> . Ignore the token. </dd> <dt>Anything else</dt> <dd> Act as if an end tag token with the tag name "head" had been seen, and reprocess the current token. In certain UAs, <a href= "https://bugzilla.mozilla.org/attachment.cgi?id=180157&action=view"> some elements</a> don't trigger the "in body" mode straight away, but instead get put into the head. Do we want to copy that? </dd> </dl> <del class="diff-old">If</del> <h5 id="parsing-main-inheadnoscript"><ins class="diff-chg">8.2.5.8.</ins> <ins class= "diff-chg">The "</ins> <dfn id="in-head0" title= "insertion mode: in head noscript"><ins class="diff-chg">in head noscript</ins></dfn> <ins class="diff-chg">" insertion mode</ins></h5> <ins class="diff-chg">When</ins> the insertion mode is " <a href="#in-head0" title= "insertion mode: in head noscript">in head noscript <del class= "diff-old">"</del></a> <ins class="diff-chg">", tokens must be handled as follows:</ins> <dl class="switch"> <dt><ins class="diff-new">A DOCTYPE token</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Ignore the token.</ins> </dd> <dt><ins class="diff-new">A start tag whose tag name is "html"</ins></dt> <dd> <ins class="diff-new">Process the token</ins> <a href= "#using8"><ins class="diff-new">using the rules for</ins></a> <ins class="diff-new">the "</ins> <a href="#in-body" title= "insertion mode: in body"><ins class="diff-new">in body</ins></a> <ins class="diff-new">"</ins> <ins class="diff-new">insertion mode</ins> . </dd> <dt>An end tag whose tag name is "noscript"</dt> <dd> Pop the <a href="#current5">current node</a> (which will be a <code><a href="#noscript">noscript</a></code> element) from the <a href="#stack">stack of open elements</a> ; the new <a href= "#current5">current node</a> will be a <code><a href= "#head">head</a></code> element. Switch the insertion mode to " <a href="#in-head" title="insertion mode: in head">in head</a> ". </dd> <dt>A character token that is one of one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</dt> <dt>A comment token</dt> <dt>A start tag whose tag name is one of: "link", "meta", <ins class="diff-new">"noframes",</ins> "style"</dt> <dd> Process the token <del class="diff-old">as if</del> <a href= "#using8"><ins class="diff-chg">using</ins> the <del class= "diff-old">insertion mode</del> <ins class="diff-chg">rules for</ins></a> <del class="diff-old">had been</del> <ins class= "diff-chg">the</ins> " <a href="#in-head" title= "insertion mode: in head">in head</a> <del class= "diff-old">".</del> <ins class="diff-chg">"</ins> <ins class= "diff-chg">insertion mode</ins> . </dd> <dt>An end tag whose tag name is one of: <del class= "diff-old">"p",</del> "br"</dt> <dd> Act as described in the "anything else" entry below. </dd> <dt>A start tag whose tag name is one of: "head", "noscript"</dt> <dt>Any other end tag</dt> <dd> <a href="#parse1">Parse error</a> . Ignore the token. </dd> <dt>Anything else</dt> <dd> <a href="#parse1">Parse error</a> . Act as if an end tag with the tag name "noscript" had been seen and reprocess the current token. </dd> </dl> <del class="diff-old">If the insertion mode is</del> <h5 id="the-after"><ins class= "diff-chg">8.2.5.9.</ins> <ins class="diff-chg">The</ins> " <dfn id="after4" title="insertion mode: after head">after head</dfn> " <ins class="diff-chg">insertion mode</ins></h5> <del class="diff-old">Handle</del> <ins class= "diff-chg">When</ins> the <del class="diff-old">token</del> <ins class="diff-chg">insertion mode</ins> <ins class= "diff-chg">is "</ins> <a href="#after4" title= "insertion mode: after head"><ins class="diff-chg">after head</ins></a> <ins class="diff-chg">", tokens must be handled</ins> as follows: <dl class="switch"> <dt>A character token that is one of one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</dt> <dd> <del class="diff-old">Append</del> <a href="#insert" title= "insert a character"><ins class="diff-chg">Insert</ins> the character</a> <del class="diff-old">to</del> <ins class= "diff-chg">into</ins> the <a href="#current5">current node</a> . </dd> <dt>A comment token</dt> <dd> Append a <code>Comment</code> node to the <a href= "#current5">current node</a> with the <code title="">data</code> attribute set to the data given in the comment token. </dd> <dt>A <ins class="diff-new">DOCTYPE token</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Ignore the token.</ins> </dd> <dt><ins class="diff-new">A start tag whose tag name is "html"</ins></dt> <dd> <ins class="diff-new">Process the token</ins> <a href= "#using8"><ins class="diff-new">using the rules for</ins></a> <ins class="diff-new">the "</ins> <a href="#in-body" title= "insertion mode: in body"><ins class="diff-new">in body</ins></a> <ins class="diff-new">"</ins> <ins class="diff-new">insertion mode</ins> . </dd> <dt><ins class="diff-new">A</ins> start tag whose tag name is "body"</dt> <dd> <a href="#insert0">Insert <del class="diff-old">a body</del> <ins class="diff-chg">an HTML</ins> element</a> for the token. <del class="diff-old">Change</del> <ins class= "diff-chg">Switch</ins> the insertion mode to " <a href="#in-body" title="insertion mode: in body">in body</a> ". </dd> <dt>A start tag whose tag name is "frameset"</dt> <dd> <a href="#insert0">Insert <del class="diff-old">a frameset</del> <ins class="diff-chg">an HTML</ins> element</a> for the token. <del class="diff-old">Change</del> <ins class= "diff-chg">Switch</ins> the insertion mode to " <a href="#in-frameset" title="insertion mode: in frameset">in frameset</a> ". </dd> <dt>A start tag token whose tag name is one of: "base", "link", "meta", <ins class="diff-new">"noframes",</ins> "script", "style", "title"</dt> <dd> <a href="#parse1">Parse error</a> . Push the node pointed to by the <a href= "#head-element"><code title="">head</code> element pointer</a> onto the <a href="#stack">stack of open elements</a> . Process the token <del class="diff-old">as if</del> <a href= "#using8"><ins class="diff-chg">using</ins> the <del class= "diff-old">insertion mode</del> <ins class="diff-chg">rules for</ins></a> <del class="diff-old">had been</del> <ins class= "diff-chg">the</ins> " <a href="#in-head" title= "insertion mode: in head">in head</a> <del class= "diff-old">".</del> <ins class="diff-chg">"</ins> <ins class= "diff-chg">insertion mode</ins> . Pop the <a href="#current5">current node</a> (which will be the node pointed to by the <a href="#head-element"><code title= "">head</code> element pointer</a> ) off the <a href="#stack">stack of open elements</a> . </dd> <dt><ins class="diff-new">A start tag whose tag name is "head"</ins></dt> <dt><ins class="diff-new">Any other end tag</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Ignore the token.</ins> </dd> <dt>Anything else</dt> <dd> Act as if a start tag token with the tag name "body" and no attributes had been seen, and then reprocess the current token. </dd> </dl> <del class="diff-old">If the insertion mode is</del> <h5 id="parsing-main-inbody"><ins class= "diff-chg">8.2.5.10.</ins> <ins class="diff-chg">The</ins> " <dfn id="in-body" title="insertion mode: in body">in body</dfn> " <ins class="diff-chg">insertion mode</ins></h5> <del class="diff-old">Handle</del> <ins class= "diff-chg">When</ins> the <del class="diff-old">token</del> <ins class="diff-chg">insertion mode</ins> <ins class= "diff-chg">is "</ins> <a href="#in-body" title= "insertion mode: in body"><ins class="diff-chg">in body</ins></a> <ins class="diff-chg">", tokens must be handled</ins> as follows: <dl class="switch"> <dt>A character token</dt> <dd> <a href="#reconstruct">Reconstruct the active formatting elements</a> , if any. <del class="diff-old">Append</del> <a href="#insert" title= "insert a character"><ins class="diff-chg">Insert</ins> the token's character</a> <del class="diff-old">to</del> <ins class= "diff-chg">into</ins> the <a href="#current5">current node</a> . </dd> <dt>A comment token</dt> <dd> Append a <code>Comment</code> node to the <a href= "#current5">current node</a> with the <code title="">data</code> attribute set to the data given in the comment token. </dd> <dt>A <ins class="diff-new">DOCTYPE token</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Ignore the token.</ins> </dd> <dt><ins class="diff-new">A</ins> start tag <del class= "diff-old">token</del> whose tag name is <del class="diff-old">one of: "base", "link", "meta", "script", "style"</del> <ins class= "diff-chg">"html"</ins></dt> <dd> <del class="diff-old">Process</del> <a href= "#parse1"><ins class="diff-chg">Parse error</ins></a> .<ins class= "diff-chg">For each attribute on</ins> the <del class= "diff-old">token as</del> <ins class="diff-chg">token, check to see</ins> if the <del class="diff-old">insertion mode had been " in head ".</del> <ins class="diff-chg">attribute is already present on the top element of the</ins> <a href="#stack"><ins class= "diff-chg">stack of open elements</ins></a> .<ins class= "diff-chg">If it is not, add the attribute and its corresponding value to that element.</ins> </dd> <dt>A start tag <ins class="diff-new">token</ins> whose tag name is <ins class="diff-new">one of: "base", "command", "event-source", "link", "meta", "noframes", "script", "style",</ins> "title"</dt> <dd> <del class="diff-old">Parse error .</del> Process the token <del class="diff-old">as if</del> <a href="#using8"><ins class= "diff-chg">using</ins> the <del class="diff-old">insertion mode</del> <ins class="diff-chg">rules for</ins></a> <del class= "diff-old">had been</del> <ins class="diff-chg">the</ins> " <a href="#in-head" title="insertion mode: in head">in head</a> <del class="diff-old">".</del> <ins class="diff-chg">"</ins> <ins class="diff-chg">insertion mode</ins> . </dd> <dt>A start tag whose tag name is "body"</dt> <dd> <a href="#parse1">Parse error</a> . If the second element on the <a href="#stack">stack of open elements</a> is not a <code><a href="#body0">body</a></code> element, or, if the <a href="#stack">stack of open elements</a> has only one node on it, then ignore the token. ( <a href= "#fragment">fragment case</a> ) Otherwise, for each attribute on the token, check to see if the attribute is already present on the <code><a href= "#body0">body</a></code> element (the second element) on the <a href="#stack">stack of open elements</a> . If it is not, add the attribute and its corresponding value to that element. </dd> <dt>An <del class="diff-old">end tag whose tag name is "body"</del> <ins class="diff-chg">end-of-file token</ins></dt> <dd> If <del class="diff-old">the second element</del> <ins class= "diff-chg">there is a node</ins> in the <a href="#stack">stack of open elements</a> <ins class="diff-new">that</ins> is not <ins class="diff-new">either a</ins> <code><a href= "#dd"><ins class="diff-new">dd</ins></a></code> <ins class= "diff-new">element, a</ins> <code><a href="#dt"><ins class= "diff-new">dt</ins></a></code> <ins class="diff-new">element, an</ins> <code><a href="#li"><ins class= "diff-new">li</ins></a></code> <ins class="diff-new">element, a</ins> <code><a href="#p"><ins class="diff-new">p</ins></a></code> <ins class="diff-new">element, a</ins> <code><a href= "#tbody"><ins class="diff-new">tbody</ins></a></code> <ins class= "diff-new">element, a</ins> <code><a href="#td"><ins class= "diff-new">td</ins></a></code> <ins class="diff-new">element, a</ins> <code><a href="#tfoot0"><ins class= "diff-new">tfoot</ins></a></code> <ins class= "diff-new">element,</ins> a <code><a href="#th"><ins class= "diff-new">th</ins></a></code> <ins class="diff-new">element, a</ins> <code><a href="#thead0"><ins class= "diff-new">thead</ins></a></code> <ins class="diff-new">element, a</ins> <code><a href="#tr"><ins class= "diff-new">tr</ins></a></code> <ins class="diff-new">element, the</ins> <code><a href="#body0">body</a></code> element, <ins class="diff-new">or the</ins> <code><a href= "#html"><ins class="diff-new">html</ins></a></code> <ins class= "diff-new">element, then</ins> this is a <a href="#parse1">parse error</a> . <del class="diff-old">Ignore</del> <a href="#stops"><ins class="diff-chg">Stop parsing</ins></a> . </dd> <dt><ins class="diff-chg">An end tag whose tag name is "body"</ins></dt> <dd> <ins class="diff-chg">If</ins> the <del class="diff-old">token. ( fragment case</del> <a href="#stack"><ins class="diff-chg">stack of open elements</ins></a> <del class="diff-old">)</del> <ins class="diff-chg">does not</ins> <a href="#have-an" title= "has an element in scope"><ins class="diff-chg">have a</ins> <code><ins class="diff-chg">body</ins></code> <ins class= "diff-chg">element in scope</ins></a> ,<ins class="diff-chg">this is a</ins> <a href="#parse1"><ins class="diff-chg">parse error</ins></a> <ins class="diff-chg">; ignore the token.</ins> Otherwise, if there is a node in the <a href="#stack">stack of open elements</a> that is not either a <code><a href= "#dd">dd</a></code> element, a <code><a href="#dt">dt</a></code> element, an <code><a href="#li">li</a></code> element, a <code><a href="#p">p</a></code> element, a <code><a href= "#tbody">tbody</a></code> element, a <code><a href= "#td">td</a></code> element, a <code><a href= "#tfoot0">tfoot</a></code> element, a <code><a href= "#th">th</a></code> element, a <code><a href= "#thead0">thead</a></code> element, a <code><a href= "#tr">tr</a></code> element, the <code><a href= "#body0">body</a></code> element, or the <code><a href= "#html">html</a></code> element, then this is a <a href= "#parse1">parse error</a> . <del class="diff-old">Change</del> <ins class= "diff-chg">Switch</ins> the insertion mode to " <a href="#after5" title="insertion mode: after body">after body</a> ". <ins class="diff-new">Otherwise, ignore the token.</ins> </dd> <dt>An end tag whose tag name is "html"</dt> <dd> Act as if an end tag with tag name "body" had been seen, then, if that token wasn't ignored, reprocess the current token. The fake end tag token here can only be ignored in the <a href="#fragment">fragment case</a> . </dd> <dt>A start tag whose tag name is one of: "address", <ins class= "diff-new">"article", "aside",</ins> "blockquote", "center", <ins class="diff-new">"datagrid", "dialog",</ins> "dir", "div", "dl", "fieldset", <del class="diff-old">"listing",</del> <ins class="diff-chg">"footer", "h1", "h2", "h3", "h4", "h5", "h6", "header",</ins> "menu", <ins class="diff-new">"nav",</ins> "ol", "p", <ins class="diff-new">"section",</ins> "ul"</dt> <dd><del class="diff-old">This doesn't match browsers.</del> If the <a href="#stack">stack of open elements</a> <a href= "#have-an" title="has an element in scope">has a <code>p</code> element in scope</a> , then act as if an end tag with the tag name <code><a href="#p">p</a></code> had been seen. <a href="#insert0">Insert an HTML element</a> for the token. </dd> <dt>A start tag whose tag name is <del class="diff-old">"pre"</del> <ins class="diff-chg">one of: "pre", "listing"</ins></dt> <dd> If the <a href="#stack">stack of open elements</a> <a href= "#have-an" title="has an element in scope">has a <code>p</code> element in scope</a> , then act as if an end tag with the tag name <code><a href="#p">p</a></code> had been seen. <a href="#insert0">Insert an HTML element</a> for the token. If the next token is a U+000A LINE FEED (LF) character token, then ignore that token and move on to the next one. (Newlines at the start of <code><a href="#pre">pre</a></code> blocks are ignored as an authoring convenience.) </dd> <dt>A start tag whose tag name is "form"</dt> <dd> If the <a href="#form-element"><code title="form">form</code> element pointer</a> is not null, ignore the token with a <a href= "#parse1">parse error</a> . Otherwise: If the <a href="#stack">stack of open elements</a> <a href= "#have-an" title="has an element in scope">has a <code>p</code> element in scope</a> , then act as if an end tag with the tag name <code><a href="#p">p</a></code> had been seen. <a href="#insert0">Insert an HTML element</a> for the token, and set the <code title="form">form</code> element pointer to point to the element created. </dd> <dt>A start tag whose tag name is "li"</dt> <dd> <del class="diff-old">If the stack of open elements has a p element in scope , then act as if an end tag with the tag name p had been seen.</del> Run the following algorithm: <ol> <li> Initialise <var title="">node</var> to be the <a href= "#current5">current node</a> (the bottommost node of the stack). </li> <li> If <var title="">node</var> is an <code><a href= "#li">li</a></code> element, then <del class="diff-old">pop all the nodes from</del> <ins class="diff-chg">act as if an end tag with</ins> the <del class="diff-old">current node</del> <ins class= "diff-chg">tag name</ins> <code><a href="#li"><ins class= "diff-chg">li</ins></a> <del class="diff-old">up to node , including node , then stop this algorithm. If more than one node is popped,</del></code> <ins class="diff-chg">had been seen,</ins> then <del class="diff-old">this is a parse error .</del> <ins class="diff-chg">jump to the last step.</ins> </li> <li> If <var title="">node</var> is not in the <a href= "#formatting">formatting</a> category, and is not in the <a href= "#phrasing1">phrasing</a> category, and is not an <code><a href= "#address">address</a></code> or <code><a href= "#div">div</a></code> element, then <del class="diff-old">stop this algorithm.</del> <ins class="diff-chg">jump to the last step.</ins> </li> <li> Otherwise, set <var title="">node</var> to the previous entry in the <a href="#stack">stack of open elements</a> and return to step 2. <del class="diff-old">Finally, insert an li element . A start tag whose tag name is one of: "dd", "dt"</del> </li> <li> If the <a href="#stack">stack of open elements</a> <a href= "#have-an" title="has an element in scope">has a <code>p</code> element in scope</a> , then act as if an end tag with the tag name <code><a href="#p">p</a></code> had been seen. <ins class="diff-new">Finally,</ins> <a href= "#insert0"><ins class="diff-new">insert an HTML element</ins></a> <ins class="diff-new">for the token.</ins> </li> </ol> </dd> <dt><ins class="diff-new">A start tag whose tag name is one of: "dd", "dt"</ins></dt> <dd> Run the following algorithm: <ol> <li> Initialise <var title="">node</var> to be the <a href= "#current5">current node</a> (the bottommost node of the stack). </li> <li> If <var title="">node</var> is a <code><a href= "#dd">dd</a></code> or <code><a href="#dt">dt</a></code> element, then <del class="diff-old">pop all the nodes from</del> <ins class= "diff-chg">act as if an end tag with</ins> the <del class= "diff-old">current node up to node , including</del> <ins class= "diff-chg">same tag name as</ins> <var title="">node <del class= "diff-old">, then stop this algorithm. If more than one node is popped,</del></var> <ins class="diff-chg">had been seen,</ins> then <del class="diff-old">this is a parse error .</del> <ins class= "diff-chg">jump to the last step.</ins> </li> <li> If <var title="">node</var> is not in the <a href= "#formatting">formatting</a> category, and is not in the <a href= "#phrasing1">phrasing</a> category, and is not an <code><a href= "#address">address</a></code> or <code><a href= "#div">div</a></code> element, then <del class="diff-old">stop this algorithm.</del> <ins class="diff-chg">jump to the last step.</ins> </li> <li> Otherwise, set <var title="">node</var> to the previous entry in the <a href="#stack">stack of open elements</a> and return to step 2. </li> <li> <ins class="diff-chg">If the</ins> <a href="#stack"><ins class= "diff-chg">stack of open elements</ins></a> <a href="#have-an" title="has an element in scope"><ins class="diff-chg">has a</ins> <code><ins class="diff-chg">p</ins></code> <ins class= "diff-chg">element in scope</ins></a> ,<ins class="diff-chg">then act as if an end tag with the tag name</ins> <code><a href= "#p"><ins class="diff-chg">p</ins></a></code> <ins class= "diff-chg">had been seen.</ins> Finally, <a href="#insert0">insert an HTML element</a> <del class="diff-old">with the same tag name as</del> <ins class= "diff-chg">for</ins> the <del class="diff-old">token's.</del> <ins class="diff-chg">token.</ins> </li> </ol> </dd> <dt>A start tag whose tag name is "plaintext"</dt> <dd> If the <a href="#stack">stack of open elements</a> <a href= "#have-an" title="has an element in scope">has a <code>p</code> element in scope</a> , then act as if an end tag with the tag name <code><a href="#p">p</a></code> had been seen. <a href="#insert0">Insert an HTML element</a> for the token. Switch the <a href="#content2">content model flag</a> to the PLAINTEXT state. Once a start tag with the tag name "plaintext" has been seen, that will be the last token ever seen other than character tokens (and the end-of-file token), because there is no way to switch the <a href="#content2">content model flag</a> out of the PLAINTEXT state. </dd> <dt>An end tag whose tag name is one of: "address", <ins class= "diff-new">"article", "aside",</ins> "blockquote", "center", <ins class="diff-new">"datagrid", "dialog",</ins> "dir", "div", "dl", "fieldset", <ins class="diff-new">"footer", "header",</ins> "listing", "menu", <ins class="diff-new">"nav",</ins> "ol", "pre", <ins class="diff-new">"section",</ins> "ul"</dt> <dd> If the <a href="#stack">stack of open elements</a> <del class= "diff-old">has</del> <ins class="diff-chg">does not</ins> <a href= "#have-an" title="has an element in scope"><ins class= "diff-chg">have</ins> an element in scope</a> with the same tag name as that of the token, then <ins class="diff-new">this is a</ins> <a href="#parse1"><ins class="diff-new">parse error</ins></a> . <ins class="diff-new">Otherwise, run these steps:</ins> <ol> <li> <a href="#generate"><del class="diff-old">generate</del> <ins class="diff-chg">Generate</ins> implied end tags</a> . </li> <li> <del class="diff-old">Now, if</del> <ins class= "diff-chg">If</ins> the <a href="#current5">current node</a> is not an element with the same tag name as that of the token, then this is a <a href="#parse1">parse error</a> . </li> <li> <del class="diff-old">If</del> <ins class="diff-chg">Pop elements from</ins> the <a href="#stack">stack of open elements</a> <del class="diff-old">has</del> <ins class="diff-chg">until</ins> an element <del class="diff-old">in scope</del> with the same tag name as <del class="diff-old">that of</del> the <del class= "diff-old">token, then pop elements from this stack until an element with that tag name</del> <ins class="diff-chg">token</ins> has been popped from the stack. </li> </ol> </dd> <dt>An end tag whose tag name is "form"</dt> <dd> <ins class="diff-new">Set the</ins> <a href= "#form-element"><code title=""><ins class= "diff-new">form</ins></code> <ins class="diff-new">element pointer</ins></a> <ins class="diff-new">to null.</ins> If the <a href="#stack">stack of open elements</a> <del class= "diff-old">has</del> <ins class="diff-chg">does not</ins> <a href= "#have-an" title="has an element in scope"><ins class= "diff-chg">have</ins> an element in scope</a> with the same tag name as that of the token, then <ins class="diff-new">this is a</ins> <a href="#parse1"><ins class="diff-new">parse error</ins></a> . <ins class="diff-new">Otherwise, run these steps:</ins> <ol> <li> <a href="#generate"><del class="diff-old">generate</del> <ins class="diff-chg">Generate</ins> implied end tags</a> . </li> <li> <del class="diff-old">Now, if</del> <ins class= "diff-chg">If</ins> the <a href="#current5">current node</a> is not an element with the same tag name as that of the token, then this is a <a href="#parse1">parse error</a> . </li> <li> <del class="diff-old">Otherwise, if</del> <ins class= "diff-chg">Pop elements from</ins> the <del class= "diff-old">current node</del> <a href="#stack"><ins class= "diff-chg">stack of open elements</ins></a> <del class= "diff-old">is</del> <ins class="diff-chg">until</ins> an element with the same tag name as <del class="diff-old">that of</del> the token <del class="diff-old">pop that element</del> <ins class= "diff-chg">has been popped</ins> from the stack. <del class= "diff-old">In any case, set the form element pointer to null.</del> </li> </ol> </dd> <dt>An end tag whose tag name is "p"</dt> <dd> If the <a href="#stack">stack of open elements</a> <ins class= "diff-new">does not</ins> <a href="#have-an" title= "has an element in scope"><del class="diff-old">has a p</del> <ins class="diff-chg">have an</ins> element in scope <del class= "diff-old">,</del></a> <ins class="diff-chg">with the same tag name as that of the token,</ins> then <del class="diff-old">generate implied end tags , except for</del> <ins class="diff-chg">this is a</ins> <a href="#parse1"><ins class="diff-chg">parse error</ins></a> <ins class="diff-chg">; act as if a start tag with the tag name</ins> <code><a href="#p">p</a></code> <del class= "diff-old">elements.</del> <ins class="diff-chg">had been seen, then reprocess the current token.</ins> <ins class="diff-new">Otherwise, run these steps:</ins> <ol> <li> <a href="#generate"><ins class="diff-new">Generate implied end tags</ins></a> ,<ins class="diff-new">except for elements with the same tag name as the token.</ins> </li> <li> If the <a href="#current5">current node</a> is not <del class= "diff-old">a p element,</del> <ins class="diff-chg">an element with the same tag name as that of the token,</ins> then this is a <a href="#parse1">parse error</a> . </li> <li> <del class="diff-old">If</del> <ins class="diff-chg">Pop elements from</ins> the <a href="#stack">stack of open elements</a> <del class="diff-old">has a p element in scope , then pop elements from this stack</del> until <del class="diff-old">the stack no longer has a p</del> <ins class="diff-chg">an</ins> element <del class="diff-old">in scope . Otherwise, act as if a start tag</del> with the <ins class="diff-new">same</ins> tag name <del class="diff-old">p had</del> <ins class="diff-chg">as the token has</ins> been <del class="diff-old">seen, then reprocess</del> <ins class="diff-chg">popped from</ins> the <del class="diff-old">current token.</del> <ins class= "diff-chg">stack.</ins> </li> </ol> </dd> <dt>An end tag whose tag name is one of: "dd", "dt", "li"</dt> <dd> If the <a href="#stack">stack of open elements</a> <del class= "diff-old">has</del> <ins class="diff-chg">does not</ins> <a href= "#have-an" title="has an element in scope"><ins class= "diff-chg">have</ins> an element in scope</a> <del class= "diff-old">whose tag name matches</del> <ins class= "diff-chg">with</ins> the <ins class="diff-new">same</ins> tag name <ins class="diff-new">as that</ins> of the token, then <ins class= "diff-new">this is a</ins> <a href="#parse1"><ins class= "diff-new">parse error</ins></a> . <ins class="diff-new">Otherwise, run these steps:</ins> <ol> <li> <a href="#generate"><del class="diff-old">generate</del> <ins class="diff-chg">Generate</ins> implied end tags</a> , except for elements with the same tag name as the token. </li> <li> If the <a href="#current5">current node</a> is not an element with the same tag name as <ins class="diff-new">that of</ins> the token, then this is a <a href="#parse1">parse error</a> . </li> <li> <del class="diff-old">If</del> <ins class="diff-chg">Pop elements from</ins> the <a href="#stack">stack of open elements</a> <del class="diff-old">has an element in scope whose tag name matches the tag name of the token, then pop elements from this stack</del> until an element with <del class="diff-old">that</del> <ins class="diff-chg">the same</ins> tag name <ins class= "diff-new">as the token</ins> has been popped from the stack. <del class="diff-old">A start tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5", "h6" If the stack of open elements has a p element in scope , then act as if an end tag with the tag name p had been seen. Insert an HTML element for the token.</del> </li> </ol> </dd> <dt>An end tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5", "h6"</dt> <dd> If the <a href="#stack">stack of open elements</a> <ins class= "diff-new">does not</ins> <a href="#have-an" title= "has an element in scope"><del class="diff-old">has</del> <ins class="diff-chg">have an element</ins> in scope</a> <del class="diff-old">an element</del> whose tag name is one of "h1", "h2", "h3", "h4", "h5", or "h6", then <ins class= "diff-new">this is a</ins> <a href="#parse1"><ins class= "diff-new">parse error</ins></a> . <ins class="diff-new">Otherwise, run these steps:</ins> <ol> <li> <a href="#generate"><del class="diff-old">generate</del> <ins class="diff-chg">Generate</ins> implied end tags</a> . </li> <li> <del class="diff-old">Now, if</del> <ins class= "diff-chg">If</ins> the <a href="#current5">current node</a> is not an element with the same tag name as that of the token, then this is a <a href="#parse1">parse error</a> . </li> <li> <del class="diff-old">If</del> <ins class="diff-chg">Pop elements from</ins> the <a href="#stack">stack of open elements</a> <del class="diff-old">has in scope</del> <ins class= "diff-chg">until</ins> an element whose tag name is one of "h1", "h2", "h3", "h4", "h5", or <del class="diff-old">"h6", then pop elements from the stack until an element with one of those tag names</del> <ins class="diff-chg">"h6"</ins> has been popped from the stack. </li> </ol> </dd> <dt><ins class="diff-new">An end tag whose tag name is "sarcasm"</ins></dt> <dd> <ins class="diff-new">Take a deep breath, then act as described in the "any other end tag" entry below.</ins> </dd> <dt>A start tag whose tag name is "a"</dt> <dd> If the <a href="#list-of4">list of active formatting elements</a> contains an element whose tag name is "a" between the end of the list and the last marker on the list (or the start of the list if there is no marker on the list), then this is a <a href="#parse1">parse error</a> ; act as if an end tag with the tag name "a" had been seen, then remove that element from the <a href="#list-of4">list of active formatting elements</a> and the <a href="#stack">stack of open elements</a> if the end tag didn't already remove it (it might not have if the element is not <a href= "#have-an0" title="has an element in table scope">in table scope</a> ). In the non-conforming stream <code><a href="a"> a<table> <a href="b"> b</table> x</code> , the first <code><a href="#a">a</a></code> element would be closed upon seeing the second one, and the "x" character would be inside a link to "b", not to "a". This is despite the fact that the outer <code><a href="#a">a</a></code> element is not in table scope (meaning that a regular <code></a></code> end tag at the start of the table wouldn't close the outer <code><a href= "#a">a</a></code> element). <a href="#reconstruct">Reconstruct the active formatting elements</a> , if any. <a href="#insert0">Insert an HTML element</a> for the token. Add that element to the <a href="#list-of4">list of active formatting elements</a> . </dd> <dt>A start tag whose tag name is one of: "b", "big", "em", "font", "i", "s", "small", "strike", "strong", "tt", "u"</dt> <dd> <a href="#reconstruct">Reconstruct the active formatting elements</a> , if any. <a href="#insert0">Insert an HTML element</a> for the token. Add that element to the <a href="#list-of4">list of active formatting elements</a> . </dd> <dt>A start tag whose tag name is "nobr"</dt> <dd> <a href="#reconstruct">Reconstruct the active formatting elements</a> , if any. If the <a href="#stack">stack of open elements</a> <a href= "#have-an" title="has an element in scope">has a <code>nobr</code> element in scope</a> , then this is a <a href="#parse1">parse error</a> . Act as if an end tag with the tag name <code>nobr</code> had been seen, then once again <a href= "#reconstruct">reconstruct the active formatting elements</a> , if any. <a href="#insert0">Insert an HTML element</a> for the token. Add that element to the <a href="#list-of4">list of active formatting elements</a> . </dd> <dt id="adoptionAgency">An end tag whose tag name is one of: "a", "b", "big", "em", "font", "i", "nobr", "s", "small", "strike", "strong", "tt", "u"</dt> <dd> Follow these steps: <ol> <li> Let the <var title="">formatting element</var> be the last element in the <a href="#list-of4">list of active formatting elements</a> that: <ul> <li>is between the end of the list and the last scope marker in the list, if any, or the start of the list otherwise, and</li> <li>has the same tag name as the token.</li> </ul> If there is no such node, or, if that node is also in the <a href="#stack">stack of open elements</a> but the element is not <a href="#have-an" title="has an element in scope">in scope</a> , then this is a <a href="#parse1">parse error</a> . Abort these steps. The token is ignored. Otherwise, if there is such a node, but that node is not in the <a href="#stack">stack of open elements</a> , then this is a <a href="#parse1">parse error</a> ; remove the element from the list, and abort these steps. Otherwise, there is a <var title="">formatting element</var> and that element is in <a href="#stack" title= "stack of open elements">the stack</a> and is <a href="#have-an" title="has an element in scope">in scope</a> . If the element is not the <a href="#current5">current node</a> , this is a <a href= "#parse1">parse error</a> . In any case, proceed with the algorithm as written in the following steps. </li> <li> Let the <var title="">furthest block</var> be the topmost node in the <a href="#stack">stack of open elements</a> that is lower in the stack than the <var title="">formatting element</var> , and is not an element in the <a href="#phrasing1">phrasing</a> or <a href= "#formatting">formatting</a> categories. There might not be one. </li> <li> If there is no <var title="">furthest block</var> , then the UA must skip the subsequent steps and instead just pop all the nodes from the bottom of the <a href="#stack">stack of open elements</a> , from the <a href="#current5">current node</a> up to and including the <var title="">formatting element</var> , and remove the <var title="">formatting element</var> from the <a href= "#list-of4">list of active formatting elements</a> . </li> <li> Let the <var title="">common ancestor</var> be the element immediately above the <var title="">formatting element</var> in the <a href="#stack">stack of open elements</a> . </li> <li> If the <var title="">furthest block</var> has a parent node, then remove the <var title="">furthest block</var> from its parent node. </li> <li> Let a bookmark note the position of the <var title="">formatting element</var> in the <a href="#list-of4">list of active formatting elements</a> relative to the elements on either side of it in the list. </li> <li> Let <var title="">node</var> and <var title="">last node</var> be the <var title="">furthest block</var> . Follow these steps: <ol> <li>Let <var title="">node</var> be the element immediately <del class="diff-old">prior to</del> <ins class= "diff-chg">above</ins> <var title="">node</var> in the <a href= "#stack">stack of open elements</a> .</li> <li>If <var title="">node</var> is not in the <a href= "#list-of4">list of active formatting elements</a> , then remove <var title="">node</var> from the <a href="#stack">stack of open elements</a> and then go back to step 1.</li> <li>Otherwise, if <var title="">node</var> is the <var title= "">formatting element</var> , then go to the next step in the overall algorithm.</li> <li>Otherwise, if <var title="">last node</var> is the <var title= "">furthest block</var> , then move the aforementioned bookmark to be immediately after the <var title="">node</var> in the <a href= "#list-of4">list of active formatting elements</a> .</li> <li>If <var title="">node</var> has any children, perform a shallow clone of <var title="">node</var> , replace the entry for <var title="">node</var> in the <a href="#list-of4">list of active formatting elements</a> with an entry for the clone, replace the entry for <var title="">node</var> in the <a href="#stack">stack of open elements</a> with an entry for the clone, and let <var title= "">node</var> be the clone.</li> <li>Insert <var title="">last node</var> into <var title= "">node</var> , first removing it from its previous parent node if any.</li> <li>Let <var title="">last node</var> be <var title="">node</var> .</li> <li>Return to step 1 of this inner set of steps.</li> </ol> </li> <li> <del class="diff-old">Insert</del> <ins class="diff-chg">If the</ins> <var title=""><ins class="diff-chg">common ancestor</ins></var> <ins class="diff-chg">node is a</ins> <code><a href="#table"><ins class="diff-chg">table</ins></a></code> ,<code><a href="#tbody"><ins class= "diff-chg">tbody</ins></a></code> ,<code><a href= "#tfoot0"><ins class="diff-chg">tfoot</ins></a></code> ,<code><a href="#thead0"><ins class= "diff-chg">thead</ins></a></code> ,<ins class="diff-chg">or</ins> <code><a href="#tr"><ins class="diff-chg">tr</ins></a></code> <ins class="diff-chg">element, then,</ins> <a href= "#foster0"><ins class="diff-chg">foster parent</ins></a> <ins class="diff-chg">whatever</ins> <var title=""><ins class= "diff-chg">last node</ins></var> <ins class="diff-chg">ended up being in the previous step.</ins> <ins class="diff-chg">Otherwise, append</ins> whatever <var title="">last node</var> ended up being in the previous step <del class="diff-old">into</del> <ins class="diff-chg">to</ins> the <var title="">common ancestor</var> node, first removing it from its previous parent node if any. </li> <li> Perform a shallow clone of the <var title="">formatting element</var> . </li> <li> Take all of the child nodes of the <var title="">furthest block</var> and append them to the clone created in the last step. </li> <li> Append that clone to the <var title="">furthest block</var> . </li> <li> Remove the <var title="">formatting element</var> from the <a href="#list-of4">list of active formatting elements</a> , and insert the clone into the <a href="#list-of4">list of active formatting elements</a> at the position of the aforementioned bookmark. </li> <li> Remove the <var title="">formatting element</var> from the <a href="#stack">stack of open elements</a> , and insert the clone into the <a href="#stack">stack of open elements</a> immediately <del class="diff-old">after (i.e. in a more deeply nested position than)</del> <ins class="diff-chg">below</ins> the position of the <var title="">furthest block</var> in that stack. </li> <li> Jump back to step 1 in this series of steps. </li> </ol> The way these steps are defined, only elements in the <a href="#formatting">formatting</a> category ever get cloned by this algorithm. Because of the way this algorithm causes elements to change parents, it has been dubbed the "adoption agency algorithm" (in contrast with other possibly algorithms for dealing with misnested content, which included the "incest algorithm", the "secret affair algorithm", and the "Heisenberg algorithm"). </dd> <dt>A start tag whose tag name is "button"</dt> <dd> If the <a href="#stack">stack of open elements</a> <a href= "#have-an" title="has an element in scope">has a <code>button</code> element in scope</a> , then this is a <a href= "#parse1">parse error</a> ; act as if an end tag with the tag name "button" had been seen, then reprocess the token. Otherwise: <a href="#reconstruct">Reconstruct the active formatting elements</a> , if any. <a href="#insert0">Insert an HTML element</a> for the token. <ins class="diff-new">If the</ins> <a href= "#form-element"><code title=""><ins class= "diff-new">form</ins></code> <ins class="diff-new">element pointer</ins></a> <ins class="diff-new">is not null, then</ins> <ins class="diff-new">associate</ins> <ins class= "diff-new">the</ins> <code><ins class= "diff-new">button</ins></code> <ins class="diff-new">element with the</ins> <code><ins class="diff-new">form</ins></code> <ins class= "diff-new">element pointed to by the</ins> <a href= "#form-element"><code title=""><ins class= "diff-new">form</ins></code> <ins class="diff-new">element pointer</ins></a> . Insert a marker at the end of the <a href="#list-of4">list of active formatting elements</a> . </dd> <dt>A start tag token whose tag name is one of: <ins class= "diff-new">"applet",</ins> "marquee", "object"</dt> <dd> <a href="#reconstruct">Reconstruct the active formatting elements</a> , if any. <a href="#insert0">Insert an HTML element</a> for the token. Insert a marker at the end of the <a href="#list-of4">list of active formatting elements</a> . </dd> <dt>An end tag token whose tag name is one of: <ins class= "diff-new">"applet",</ins> "button", "marquee", "object"</dt> <dd> If the <a href="#stack">stack of open elements</a> <ins class= "diff-new">does not</ins> <a href="#have-an" title= "has an element in scope"><del class="diff-old">has</del> <ins class="diff-chg">have an element</ins> in scope</a> <del class="diff-old">an element whose tag name is</del> <ins class="diff-chg">with</ins> the same <del class="diff-old">as the</del> tag name <ins class="diff-new">as that</ins> of the token, then <ins class="diff-new">this is a</ins> <a href= "#parse1"><ins class="diff-new">parse error</ins></a> . <ins class="diff-new">Otherwise, run these steps:</ins> <ol> <li> <a href="#generate"><del class="diff-old">generate</del> <ins class="diff-chg">Generate</ins> implied end tags</a> . </li> <li> <del class="diff-old">Now, if</del> <ins class= "diff-chg">If</ins> the <a href="#current5">current node</a> is not an element with the same tag name as <ins class="diff-new">that of</ins> the token, then this is a <a href="#parse1">parse error</a> . </li> <li> <del class="diff-old">Now, if</del> <ins class="diff-chg">Pop elements from</ins> the <a href="#stack">stack of open elements</a> <del class="diff-old">has</del> <ins class="diff-chg">until</ins> an element <del class="diff-old">in scope whose tag name matches</del> <ins class="diff-chg">with</ins> the <ins class= "diff-new">same</ins> tag name <del class="diff-old">of the token, then pop elements from</del> <ins class="diff-chg">as</ins> the <del class="diff-old">stack until that element</del> <ins class= "diff-chg">token</ins> has been popped from the <del class= "diff-old">stack, and clear</del> <ins class= "diff-chg">stack.</ins> </li> <li><a href="#clear1"><ins class="diff-chg">Clear</ins> the list of active formatting elements up to the last marker</a> .</li> </ol> </dd> <dt>A start tag whose tag name is "xmp"</dt> <dd> <a href="#reconstruct">Reconstruct the active formatting elements</a> , if any. Follow the <a href="#generic">generic CDATA parsing algorithm <del class="diff-old">, with the current node as the context node .</del></a> . </dd> <dt>A start tag whose tag name is "table"</dt> <dd> If the <a href="#stack">stack of open elements</a> <a href= "#have-an" title="has an element in scope">has a <code>p</code> element in scope</a> , then act as if an end tag with the tag name <code><a href="#p">p</a></code> had been seen. <a href="#insert0">Insert an HTML element</a> for the token. <del class="diff-old">Change</del> <ins class= "diff-chg">Switch</ins> the insertion mode to " <a href="#in-table" title="insertion mode: in table">in table</a> ". </dd> <dt>A start tag whose tag name is one of: "area", "basefont", "bgsound", "br", "embed", "img", <del class= "diff-old">"param",</del> "spacer", "wbr"</dt> <dd> <a href="#reconstruct">Reconstruct the active formatting elements</a> , if any. <a href="#insert0">Insert an HTML element</a> for the token. Immediately pop the <a href="#current5"><ins class= "diff-chg">current node</ins></a> <ins class="diff-chg">off the</ins> <a href="#stack"><ins class="diff-chg">stack of open elements</ins></a> . <a href="#acknowledged" title= "acknowledge self-closing flag"><ins class="diff-chg">Acknowledge the token's</ins> <ins class="diff-chg">self-closing flag</ins></a> ,<ins class="diff-chg">if it is set.</ins> </dd> <dt><ins class="diff-chg">A start tag whose tag name is one of: "param", "source"</ins></dt> <dd> <a href="#insert0"><ins class="diff-chg">Insert an HTML element</ins></a> <ins class="diff-chg">for the token. Immediately pop the</ins> <a href="#current5">current node</a> off the <a href= "#stack">stack of open elements</a> . <a href="#acknowledged" title= "acknowledge self-closing flag"><ins class="diff-new">Acknowledge the token's</ins> <ins class="diff-new">self-closing flag</ins></a> ,<ins class="diff-new">if it is set.</ins> </dd> <dt>A start tag whose tag name is "hr"</dt> <dd> If the <a href="#stack">stack of open elements</a> <a href= "#have-an" title="has an element in scope">has a <code>p</code> element in scope</a> , then act as if an end tag with the tag name <code><a href="#p">p</a></code> had been seen. <a href="#insert0">Insert an HTML element</a> for the token. Immediately pop the <a href="#current5">current node</a> off the <a href="#stack">stack of open elements</a> . <a href="#acknowledged" title= "acknowledge self-closing flag"><ins class="diff-new">Acknowledge the token's</ins> <ins class="diff-new">self-closing flag</ins></a> ,<ins class="diff-new">if it is set.</ins> </dd> <dt>A start tag whose tag name is "image"</dt> <dd> <a href="#parse1">Parse error</a> . Change the token's tag name to "img" and reprocess it. (Don't ask.) </dd> <dt>A start tag whose tag name is "input"</dt> <dd> <a href="#reconstruct">Reconstruct the active formatting elements</a> , if any. <a href="#insert0">Insert an <del class="diff-old">input</del> <ins class="diff-chg">HTML</ins> element</a> for the token. <ins class="diff-new">Immediately pop the</ins> <a href= "#current5"><ins class="diff-new">current node</ins></a> <ins class="diff-new">off the</ins> <a href="#stack"><ins class= "diff-new">stack of open elements</ins></a> . <a href="#acknowledged" title= "acknowledge self-closing flag"><ins class="diff-new">Acknowledge the token's</ins> <ins class="diff-new">self-closing flag</ins></a> ,<ins class="diff-new">if it is set.</ins> If the <a href="#form-element"><code title="">form</code> element pointer</a> is not null, then associate the <ins class="diff-new">newly created</ins> <code>input</code> element with the <code>form</code> element pointed to by the <a href="#form-element"><code title="">form</code> element pointer</a> . <del class="diff-old">Pop that input element off the stack of open elements .</del></dd> <dt id="isindex">A start tag whose tag name is "isindex"</dt> <dd> <a href="#parse1">Parse error</a> . If the <a href="#form-element"><code title="">form</code> element pointer</a> is not null, then ignore the token. Otherwise: <a href="#acknowledged" title= "acknowledge self-closing flag"><ins class="diff-new">Acknowledge the token's</ins> <ins class="diff-new">self-closing flag</ins></a> ,<ins class="diff-new">if it is set.</ins> Act as if a start tag token with the tag name "form" had been seen. If the token has an attribute called "action", set the <code title="attr-form-action">action</code> attribute on the resulting <code>form</code> element to the value of the "action" attribute of the token. Act as if a start tag token with the tag name "hr" had been seen. Act as if a start tag token with the tag name "p" had been seen. Act as if a start tag token with the tag name "label" had been seen. Act as if a stream of character tokens had been seen (see below for what they should say). Act as if a start tag token with the tag name "input" had been seen, with all the attributes from the "isindex" token except "name", "action", and "prompt". Set the <code title= "attr-input-name">name</code> attribute of the resulting <code>input</code> element to the value " <code title= "">isindex</code> ". Act as if a stream of character tokens had been seen (see below for what they should say). Act as if an end tag token with the tag name "label" had been seen. Act as if an end tag token with the tag name "p" had been seen. Act as if a start tag token with the tag name "hr" had been seen. Act as if an end tag token with the tag name "form" had been seen. If the token has an attribute with the name "prompt", then the first stream of characters must be the same string as given in that attribute, and the second stream of characters must be empty. Otherwise, the two streams of character tokens together should, together with the <code>input</code> element, express the equivalent of "This is a searchable index. Insert your search keywords here: (input field)" in the user's preferred language. Then need to specify that if the form submission causes just a single form control, whose name is "isindex", to be submitted, then we submit just the value part, not the "isindex=" part. </dd> <dt>A start tag whose tag name is "textarea"</dt> <dd> <a href="#create">Create an element for the token</a> <ins class="diff-new">in the</ins> <a href= "#html-namespace0"><ins class="diff-new">HTML namespace</ins></a> .<ins class="diff-new">Append the new element to the</ins> <a href= "#current5"><ins class="diff-new">current node</ins></a> . If the <a href="#form-element"><code title="">form</code> element pointer</a> is not null, then associate the <ins class="diff-new">newly created</ins> <code>textarea</code> element with the <code>form</code> element pointed to by the <a href="#form-element"><code title="">form</code> element pointer</a> . <del class="diff-old">Append the new element to the current node .</del> Switch the tokeniser's <a href="#content2">content model flag</a> to the RCDATA state. If the next token is a U+000A LINE FEED (LF) character token, then ignore that token and move on to the next one. (Newlines at the start of <code>textarea</code> elements are ignored as an authoring convenience.) Then, collect all the character tokens that the tokeniser returns until it returns a token that is not a character token, or until it stops tokenising. If this process resulted in a collection of character tokens, append a single <code>Text</code> node, whose contents is the concatenation of all those tokens' characters, to the new element node. The tokeniser's <a href="#content2">content model flag</a> will have switched back to the PCDATA state. If the next token is an end tag token with the tag name "textarea", ignore it. Otherwise, this is a <a href="#parse1">parse error</a> . </dd> <dt>A start tag whose tag name is one of: "iframe", <del class= "diff-old">"noembed", "noframes"</del> <ins class= "diff-chg">"noembed"</ins></dt> <dt>A start tag whose tag name is "noscript", if <ins class= "diff-new">the</ins> <a href="#scripting2">scripting <ins class= "diff-new">flag</ins></a> is enabled <del class= "diff-old">:</del></dt> <dd> Follow the <a href="#generic">generic CDATA parsing algorithm <del class="diff-old">, with the current node as the context node .</del></a> . </dd> <dt>A start tag whose tag name is "select"</dt> <dd> <a href="#reconstruct">Reconstruct the active formatting elements</a> , if any. <a href="#insert0">Insert an HTML element</a> for the token. <del class="diff-old">Change</del> <ins class= "diff-chg">If</ins> the <a href="#form-element"><code title= ""><ins class="diff-chg">form</ins></code> <ins class= "diff-chg">element pointer</ins></a> <ins class="diff-chg">is not null, then</ins> <ins class="diff-chg">associate</ins> <ins class="diff-chg">the</ins> <code><ins class= "diff-chg">select</ins></code> <ins class="diff-chg">element with the</ins> <code><ins class="diff-chg">form</ins></code> <ins class= "diff-chg">element pointed to by the</ins> <a href= "#form-element"><code title=""><ins class= "diff-chg">form</ins></code> <ins class="diff-chg">element pointer</ins></a> . <ins class="diff-chg">If the</ins> insertion mode <ins class="diff-new">is one of</ins> <a href="#in-table" title= "insertion mode: in table"><ins class="diff-new">in table</ins></a> <ins class="diff-new">", "</ins> <a href="#in-caption" title= "insertion mode: in caption"><ins class="diff-new">in caption</ins></a> <ins class="diff-new">", "</ins> <a href= "#in-column" title="insertion mode: in column group"><ins class= "diff-new">in column group</ins></a> <ins class="diff-new">", "</ins> <a href="#in-table0" title= "insertion mode: in table body"><ins class="diff-new">in table body</ins></a> <ins class="diff-new">", "</ins> <a href="#in-row" title="insertion mode: in row"><ins class="diff-new">in row</ins></a> <ins class="diff-new">", or "</ins> <a href= "#in-cell" title="insertion mode: in cell"><ins class="diff-new">in cell</ins></a> <ins class="diff-new">", then switch the</ins> <ins class="diff-new">insertion mode</ins> <ins class= "diff-new">to "</ins> <a href="#in-select0" title= "insertion mode: in select in table"><ins class="diff-new">in select in table</ins></a> <ins class="diff-new">". Otherwise, switch the</ins> <ins class="diff-new">insertion mode</ins> to " <a href="#in-select" title= "insertion mode: in select">in select</a> ". </dd> <dt><ins class="diff-new">A start tag whose tag name is one of: "rp", "rt"</ins></dt> <dd> <ins class="diff-new">If the</ins> <a href="#stack"><ins class= "diff-new">stack of open elements</ins></a> <a href="#have-an" title="has an element in scope"><ins class="diff-new">has a</ins> <code><ins class="diff-new">ruby</ins></code> <ins class= "diff-new">element in scope</ins></a> ,<ins class= "diff-new">then</ins> <a href="#generate"><ins class= "diff-new">generate implied end tags</ins></a> .<ins class= "diff-new">If the</ins> <a href="#current5"><ins class= "diff-new">current node</ins></a> <ins class="diff-new">is not then a</ins> <code><a href="#ruby"><ins class= "diff-new">ruby</ins></a></code> <ins class="diff-new">element, this is a</ins> <a href="#parse1"><ins class="diff-new">parse error</ins></a> <ins class="diff-new">; pop all the nodes from the</ins> <a href="#current5"><ins class="diff-new">current node</ins></a> <ins class="diff-new">up to the node immediately before the bottommost</ins> <code><a href="#ruby"><ins class= "diff-new">ruby</ins></a></code> <ins class="diff-new">element on the</ins> <a href="#stack"><ins class="diff-new">stack of open elements</ins></a> . <a href="#insert0"><ins class="diff-new">Insert an HTML element</ins></a> <ins class="diff-new">for the token.</ins> </dd> <dt>An end tag whose tag name is "br"</dt> <dd> <a href="#parse1">Parse error</a> . Act as if a start tag token with the tag name "br" had been seen. Ignore the end tag token. </dd> <dt>A start <del class="diff-old">or end</del> <ins class= "diff-chg">tag whose tag name is "math"</ins></dt> <dd> <a href="#reconstruct"><ins class="diff-chg">Reconstruct the active formatting elements</ins></a> ,<ins class="diff-chg">if any.</ins> <a href="#adjust"><ins class="diff-chg">Adjust foreign attributes</ins></a> <ins class="diff-chg">for the token. (This fixes the use of namespaced attributes, in particular XLink.)</ins> <a href="#insert1"><ins class="diff-chg">Insert a foreign element</ins></a> <ins class="diff-chg">for the token, in the</ins> <a href="#mathml0"><ins class="diff-chg">MathML namespace</ins></a> . <ins class="diff-chg">If the token has its</ins> <ins class= "diff-chg">self-closing flag</ins> <ins class="diff-chg">set, pop the</ins> <a href="#current5"><ins class="diff-chg">current node</ins></a> <ins class="diff-chg">off the</ins> <a href= "#stack"><ins class="diff-chg">stack of open elements</ins></a> <ins class="diff-chg">and</ins> <a href="#acknowledged" title= "acknowledge self-closing flag"><ins class="diff-chg">acknowledge the token's</ins> <ins class="diff-chg">self-closing flag</ins></a> . <ins class="diff-chg">Otherwise, let the</ins> <a href= "#secondary1"><ins class="diff-chg">secondary insertion mode</ins></a> <ins class="diff-chg">be the current</ins> <ins class="diff-chg">insertion mode</ins> ,<ins class="diff-chg">and then switch the</ins> <ins class= "diff-chg">insertion mode</ins> <ins class="diff-chg">to "</ins> <a href="#in-foreign" title= "insertion mode: in foreign content"><ins class="diff-chg">in foreign content</ins></a> <ins class="diff-chg">".</ins> </dd> <dt><ins class="diff-chg">A start</ins> tag whose tag name is one of: "caption", "col", "colgroup", "frame", "frameset", "head", <del class="diff-old">"option", "optgroup",</del> "tbody", "td", "tfoot", "th", "thead", "tr" <del class="diff-old">An end tag whose tag name is one of: "area", "basefont", "bgsound", "br", "embed", "hr", "iframe", "image", "img", "input", "isindex", "noembed", "noframes", "param", "select", "spacer", "table", "textarea", "wbr"</del></dt> <dd><del class="diff-old">An end tag whose tag name is "noscript", if scripting is enabled :</del></dd> <dd> <a href="#parse1">Parse error</a> . Ignore the token. </dd> <dt><del class="diff-old">A start or end tag whose tag name is one of: "event-source", "section", "nav", "article", "aside", "header", "footer", "datagrid", "command" Work in progress! A</del> <ins class="diff-chg">Any other</ins> start tag <del class= "diff-old">token not covered by the previous entries</del></dt> <dd> <a href="#reconstruct">Reconstruct the active formatting elements</a> , if any. <a href="#insert0">Insert an HTML element</a> for the token. This element will be a <a href= "#phrasing1">phrasing</a> element. </dd> <dt><del class="diff-old">An</del> <ins class="diff-chg">Any other</ins> end tag <del class="diff-old">token not covered by the previous entries</del></dt> <dd> Run the following algorithm: <ol> <li> Initialise <var title="">node</var> to be the <a href= "#current5">current node</a> (the bottommost node of the stack). </li> <li> If <var title="">node</var> has the same tag name as the end tag token, then: <ol> <li> <a href="#generate">Generate implied end tags</a> . </li> <li> If the tag name of the end tag token does not match the tag name of the <a href="#current5">current node</a> , this is a <a href= "#parse1">parse error</a> . </li> <li> Pop all the nodes from the <a href="#current5">current node</a> up to <var title="">node</var> , including <var title="">node</var> , then stop this algorithm. </li> </ol> </li> <li> Otherwise, if <var title="">node</var> is in neither the <a href="#formatting">formatting</a> category nor the <a href= "#phrasing1">phrasing</a> category, then this is a <a href= "#parse1">parse error</a> . Stop this algorithm. The end tag token is ignored. </li> <li> Set <var title="">node</var> to the previous entry in the <a href="#stack">stack of open elements</a> . </li> <li> Return to step 2. </li> </ol> </dd> </dl> <del class="diff-old">If</del> <h5 id="parsing-main-intable"><ins class= "diff-chg">8.2.5.11.</ins> <ins class="diff-chg">The "</ins> <dfn id="in-table" title="insertion mode: in table"><ins class= "diff-chg">in table</ins></dfn> <ins class="diff-chg">" insertion mode</ins></h5> <ins class="diff-chg">When</ins> the insertion mode is " <a href="#in-table" title="insertion mode: in table">in table <del class="diff-old">"</del></a> <ins class="diff-chg">", tokens must be handled as follows:</ins> <dl class="switch"> <dt>A character token that is one of one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</dt> <dd> <del class="diff-old">Append</del> <ins class="diff-chg">If the</ins> <a href="#current6"><ins class="diff-chg">current table</ins></a> <ins class="diff-chg">is</ins> <a href= "#tainted"><ins class="diff-chg">tainted</ins></a> ,<ins class= "diff-chg">then act as described in the "anything else" entry below.</ins> <ins class="diff-chg">Otherwise,</ins> <a href="#insert" title= "insert a character"><ins class="diff-chg">insert</ins> the character</a> <del class="diff-old">to</del> <ins class= "diff-chg">into</ins> the <a href="#current5">current node</a> . </dd> <dt>A comment token</dt> <dd> Append a <code>Comment</code> node to the <a href= "#current5">current node</a> with the <code title="">data</code> attribute set to the data given in the comment token. </dd> <dt>A <ins class="diff-new">DOCTYPE token</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Ignore the token.</ins> </dd> <dt><ins class="diff-new">A</ins> start tag whose tag name is "caption"</dt> <dd> <a href="#clear2">Clear the stack back to a table context</a> . (See below.) Insert a marker at the end of the <a href="#list-of4">list of active formatting elements</a> . <a href="#insert0">Insert an HTML element</a> for the token, then switch the insertion mode to " <a href= "#in-caption" title="insertion mode: in caption">in caption</a> ". </dd> <dt>A start tag whose tag name is "colgroup"</dt> <dd> <a href="#clear2">Clear the stack back to a table context</a> . (See below.) <a href="#insert0">Insert an HTML element</a> for the token, then switch the insertion mode to " <a href= "#in-column" title="insertion mode: in column group">in column group</a> ". </dd> <dt>A start tag whose tag name is "col"</dt> <dd> Act as if a start tag token with the tag name "colgroup" had been seen, then reprocess the current token. </dd> <dt>A start tag whose tag name is one of: "tbody", "tfoot", "thead"</dt> <dd> <a href="#clear2">Clear the stack back to a table context</a> . (See below.) <a href="#insert0">Insert an HTML element</a> for the token, then switch the insertion mode to " <a href= "#in-table0" title="insertion mode: in table body">in table body</a> ". </dd> <dt>A start tag whose tag name is one of: "td", "th", "tr"</dt> <dd> Act as if a start tag token with the tag name "tbody" had been seen, then reprocess the current token. </dd> <dt>A start tag whose tag name is "table"</dt> <dd> <a href="#parse1">Parse error</a> . Act as if an end tag token with the tag name "table" had been seen, then, if that token wasn't ignored, reprocess the current token. The fake end tag token here can only be ignored in the <a href="#fragment">fragment case</a> . </dd> <dt>An end tag whose tag name is "table"</dt> <dd> If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an element in table scope</a> with the same tag name as the token, this is a <a href="#parse1">parse error</a> . Ignore the token. ( <a href="#fragment">fragment case</a> ) Otherwise: <del class="diff-old">Generate implied end tags . Now, if the current node is not a table element, then this is a parse error .</del> Pop elements from this stack until a <code><a href= "#table">table</a></code> element has been popped from the stack. <a href="#reset">Reset the insertion mode appropriately</a> . </dd> <dt>An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr"</dt> <dd> <a href="#parse1">Parse error</a> . Ignore the token. </dd> <dt><del class="diff-old">Anything else</del> <ins class= "diff-chg">A start tag whose tag name is one of: "style", "script"</ins></dt> <dd> <del class="diff-old">Parse error . Process</del> <ins class= "diff-chg">If</ins> the <del class="diff-old">token</del> <a href= "#current6"><ins class="diff-chg">current table</ins></a> <ins class="diff-chg">is</ins> <a href="#tainted"><ins class= "diff-chg">tainted</ins></a> <ins class="diff-chg">then act</ins> as <del class="diff-old">if</del> <ins class="diff-chg">described in</ins> the <del class="diff-old">insertion mode</del> <ins class= "diff-chg">"anything else" entry below.</ins> <ins class="diff-chg">Otherwise, process the token</ins> <a href="#using8"><ins class="diff-chg">using the rules for</ins></a> <del class="diff-old">was</del> <ins class= "diff-chg">the</ins> " <a href="#in-head" title= "insertion mode: in head">in <del class="diff-old">body</del> <ins class="diff-chg">head</ins></a> <del class="diff-old">", with the following exception:</del> <ins class="diff-chg">"</ins> <ins class="diff-chg">insertion mode</ins> . </dd> <dt><ins class="diff-new">A start tag whose tag name is "input"</ins></dt> <dd> If the <del class="diff-old">current node is a table , tbody , tfoot , thead ,</del> <ins class="diff-chg">token does not have an attribute with the name "type",</ins> or <del class="diff-old">tr element, then, whenever</del> <ins class="diff-chg">if it does, but that attribute's value is not</ins> a <del class="diff-old">node would be inserted into</del> <ins class="diff-chg">case-insensitive match for</ins> the <ins class="diff-chg">string "hidden", or, if the</ins> <a href="#current6">current <del class= "diff-old">node</del> <ins class="diff-chg">table</ins></a> <ins class="diff-chg">is</ins> <a href="#tainted"><ins class= "diff-chg">tainted</ins></a> , <del class="diff-old">it must instead be inserted into</del> <ins class="diff-chg">then: act as described in</ins> the <ins class="diff-chg">"anything else" entry below.</ins> <ins class="diff-chg">Otherwise:</ins> <del class="diff-old">foster parent</del> <a href= "#parse1"><ins class="diff-chg">Parse error</ins></a> . <a href="#insert0"><ins class="diff-chg">Insert an HTML</ins> element</a> <del class="diff-old">.</del> <ins class="diff-chg">for the token.</ins> <del class="diff-old">The foster parent</del> <ins class= "diff-chg">If the</ins> <a href="#form-element"><code title= ""><ins class="diff-chg">form</ins></code> element <ins class= "diff-chg">pointer</ins></a> is <ins class="diff-new">not null, then</ins> <ins class="diff-new">associate</ins> the <del class="diff-old">parent</del> <code><ins class= "diff-chg">input</ins></code> element <del class= "diff-old">of</del> <ins class="diff-chg">with</ins> the <del class="diff-old">last</del> <code><del class= "diff-old">table</del> <ins class="diff-chg">form</ins></code> element <del class="diff-old">in</del> <ins class= "diff-chg">pointed to by</ins> the <del class="diff-old">stack of open elements , if there is a table</del> <a href= "#form-element"><code title=""><ins class= "diff-new">form</ins></code> element <del class="diff-old">and it has such a parent element. If there is no</del> <ins class= "diff-chg">pointer</ins></a> . <ins class="diff-chg">Pop that</ins> <code><del class= "diff-old">table</del> <ins class="diff-chg">input</ins></code> element <del class="diff-old">in</del> <ins class= "diff-chg">off</ins> the <a href="#stack">stack of open elements <del class="diff-old">( fragment case ), then</del></a> . </dd> <dt><ins class="diff-chg">An end-of-file token</ins></dt> <dd> <ins class="diff-chg">If</ins> the <del class="diff-old">foster parent element</del> <a href="#current5"><ins class= "diff-chg">current node</ins></a> is <ins class= "diff-new">not</ins> the <del class="diff-old">first element in the stack of open elements (the</del> <ins class="diff-chg">root</ins> <code><a href="#html">html</a></code> <del class= "diff-old">element). Otherwise, if there</del> <ins class= "diff-chg">element, then this</ins> is a <del class= "diff-old">table</del> <a href="#parse1"><ins class= "diff-chg">parse error.</ins></a> . <ins class="diff-chg">It can only be the</ins> <a href="#current5"><ins class="diff-chg">current node</ins></a> <del class="diff-old">element</del> in the <del class= "diff-old">stack of open elements , but the last</del> <a href= "#fragment"><ins class="diff-chg">fragment case</ins></a> . <del class="diff-old">table</del> <a href="#stops"><ins class= "diff-chg">Stop parsing.</ins></a> <del class="diff-old">element in</del> </dd> <dt><ins class="diff-chg">Anything else</ins></dt> <dd> <a href="#parse1"><ins class="diff-chg">Parse error</ins></a> .<ins class="diff-chg">Process</ins> the <del class= "diff-old">stack of open elements has no parent, or its parent node is not an element, then</del> <ins class="diff-chg">token</ins> <a href="#using8"><ins class="diff-chg">using</ins> the <del class= "diff-old">foster parent element</del> <ins class="diff-chg">rules for</ins></a> <del class="diff-old">is</del> the <del class= "diff-old">element before</del> <ins class="diff-chg">"</ins> <a href="#in-body" title="insertion mode: in body"><ins class= "diff-chg">in body</ins></a> <ins class="diff-chg">"</ins> <ins class="diff-chg">insertion mode</ins> ,<ins class="diff-chg">except that if</ins> the <del class= "diff-old">last</del> <a href="#current5"><ins class= "diff-chg">current node</ins></a> <ins class="diff-chg">is a</ins> <code><a href="#table">table</a> <del class="diff-old">element in the stack of open elements . If the</del></code> , <code><del class="diff-old">foster parent element</del> <a href= "#tbody"><ins class="diff-chg">tbody</ins></a> <del class= "diff-old">is the parent element of the last</del></code> , <code><del class="diff-old">table</del> <a href= "#tfoot0"><ins class="diff-chg">tfoot</ins></a> <del class= "diff-old">element in the stack of open elements , then the new node must be inserted immediately before the last</del></code> , <code><del class="diff-old">table</del> <a href= "#thead0"><ins class="diff-chg">thead</ins></a> <del class= "diff-old">element in the stack of open elements in the foster parent element</del></code> , <ins class="diff-chg">or</ins> <code><a href="#tr"><ins class="diff-chg">tr</ins></a> <del class= "diff-old">; otherwise,</del></code> <ins class="diff-chg">element, then, whenever a node would be inserted into</ins> the <del class= "diff-old">new</del> <a href="#current5"><ins class= "diff-chg">current</ins> node</a> , <ins class="diff-new">it</ins> must <ins class="diff-new">instead</ins> be <del class= "diff-old">appended to the</del> <a href="#foster0" title= "foster parent">foster <del class="diff-old">parent element</del> <ins class="diff-chg">parented</ins></a> . </dd> </dl> When the steps above require the UA to <dfn id="clear2">clear the stack back to a table context</dfn> , it means that the UA must, while the <a href="#current5">current node</a> is not a <code><a href="#table">table</a></code> element or an <code><a href="#html">html</a></code> element, pop elements from the <a href="#stack">stack of open elements</a> . <del class= "diff-old">If this causes any elements to be popped from the stack, then this is a parse error .</del> The <a href="#current5">current node</a> being an <code><a href="#html">html</a></code> element after this process is a <a href="#fragment">fragment case</a> . <del class= "diff-old">If</del> <h5 id="parsing-main-incaption"><ins class= "diff-chg">8.2.5.12.</ins> <ins class="diff-chg">The "</ins> <dfn id="in-caption" title="insertion mode: in caption"><ins class= "diff-chg">in caption</ins></dfn> <ins class="diff-chg">" insertion mode</ins></h5> <ins class="diff-chg">When</ins> the insertion mode is " <a href="#in-caption" title="insertion mode: in caption">in caption <del class="diff-old">"</del></a> <ins class="diff-chg">", tokens must be handled as follows:</ins> <dl class="switch"> <dt>An end tag whose tag name is "caption"</dt> <dd> If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an element in table scope</a> with the same tag name as the token, this is a <a href="#parse1">parse error</a> . Ignore the token. ( <a href="#fragment">fragment case</a> ) Otherwise: <a href="#generate">Generate implied end tags</a> . Now, if the <a href="#current5">current node</a> is not a <code><a href="#caption0">caption</a></code> element, then this is a <a href="#parse1">parse error</a> . Pop elements from this stack until a <code><a href= "#caption0">caption</a></code> element has been popped from the stack. <a href="#clear1">Clear the list of active formatting elements up to the last marker</a> . Switch the insertion mode to " <a href="#in-table" title="insertion mode: in table">in table</a> ". </dd> <dt>A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "td", "tfoot", "th", "thead", "tr"</dt> <dt>An end tag whose tag name is "table"</dt> <dd> <a href="#parse1">Parse error</a> . Act as if an end tag with the tag name "caption" had been seen, then, if that token wasn't ignored, reprocess the current token. The fake end tag token here can only be ignored in the <a href="#fragment">fragment case</a> . </dd> <dt>An end tag whose tag name is one of: "body", "col", "colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr"</dt> <dd> <a href="#parse1">Parse error</a> . Ignore the token. </dd> <dt>Anything else</dt> <dd> Process the token <del class="diff-old">as if</del> <a href= "#using8"><ins class="diff-chg">using</ins> the <del class= "diff-old">insertion mode</del> <ins class="diff-chg">rules for</ins></a> <del class="diff-old">was</del> <ins class= "diff-chg">the</ins> " <a href="#in-body" title= "insertion mode: in body">in body</a> <del class= "diff-old">".</del> <ins class="diff-chg">"</ins> <ins class= "diff-chg">insertion mode</ins> . </dd> </dl> <del class="diff-old">If</del> <h5 id="parsing-main-incolgroup"><ins class= "diff-chg">8.2.5.13.</ins> <ins class="diff-chg">The "</ins> <dfn id="in-column" title= "insertion mode: in column group"><ins class="diff-chg">in column group</ins></dfn> <ins class="diff-chg">" insertion mode</ins></h5> <ins class="diff-chg">When</ins> the insertion mode is " <a href="#in-column" title= "insertion mode: in column group">in column group <del class= "diff-old">"</del></a> <ins class="diff-chg">", tokens must be handled as follows:</ins> <dl class="switch"> <dt>A character token that is one of one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</dt> <dd> <del class="diff-old">Append</del> <a href="#insert" title= "insert a character"><ins class="diff-chg">Insert</ins> the character</a> <del class="diff-old">to</del> <ins class= "diff-chg">into</ins> the <a href="#current5">current node</a> . </dd> <dt>A comment token</dt> <dd> Append a <code>Comment</code> node to the <a href= "#current5">current node</a> with the <code title="">data</code> attribute set to the data given in the comment token. </dd> <dt>A <ins class="diff-new">DOCTYPE token</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Ignore the token.</ins> </dd> <dt><ins class="diff-new">A start tag whose tag name is "html"</ins></dt> <dd> <ins class="diff-new">Process the token</ins> <a href= "#using8"><ins class="diff-new">using the rules for</ins></a> <ins class="diff-new">the "</ins> <a href="#in-body" title= "insertion mode: in body"><ins class="diff-new">in body</ins></a> <ins class="diff-new">"</ins> <ins class="diff-new">insertion mode</ins> . </dd> <dt><ins class="diff-new">A</ins> start tag whose tag name is "col"</dt> <dd> <a href="#insert0">Insert <del class="diff-old">a col</del> <ins class="diff-chg">an HTML</ins> element</a> for the token. Immediately pop the <a href="#current5">current node</a> off the <a href="#stack">stack of open elements</a> . <a href="#acknowledged" title= "acknowledge self-closing flag"><ins class="diff-new">Acknowledge the token's</ins> <ins class="diff-new">self-closing flag</ins></a> ,<ins class="diff-new">if it is set.</ins> </dd> <dt>An end tag whose tag name is "colgroup"</dt> <dd> If the <a href="#current5">current node</a> is the root <code><a href="#html">html</a></code> element, then this is a <a href="#parse1">parse error</a> , ignore the token. ( <a href= "#fragment">fragment case</a> ) Otherwise, pop the <a href="#current5">current node</a> (which will be a <code><a href="#colgroup">colgroup</a></code> element) from the <a href="#stack">stack of open elements</a> . Switch the insertion mode to " <a href="#in-table" title= "insertion mode: in table">in table</a> ". </dd> <dt>An end tag whose tag name is "col"</dt> <dd> <a href="#parse1">Parse error</a> . Ignore the token. </dd> <dt><ins class="diff-new">An end-of-file token</ins></dt> <dd> <ins class="diff-new">If the</ins> <a href= "#current5"><ins class="diff-new">current node</ins></a> <ins class="diff-new">is the root</ins> <code><a href= "#html"><ins class="diff-new">html</ins></a></code> <ins class= "diff-new">element, then</ins> <a href="#stops"><ins class= "diff-new">stop parsing</ins></a> .<ins class="diff-new">(</ins> <a href="#fragment"><ins class="diff-new">fragment case</ins></a> <ins class="diff-new">)</ins> <ins class="diff-new">Otherwise, act as described in the "anything else" entry below.</ins> </dd> <dt>Anything else</dt> <dd> Act as if an end tag with the tag name "colgroup" had been seen, and then, if that token wasn't ignored, reprocess the current token. The fake end tag token here can only be ignored in the <a href="#fragment">fragment case</a> . </dd> </dl> <del class="diff-old">If</del> <h5 id="parsing-main-intbody"><ins class= "diff-chg">8.2.5.14.</ins> <ins class="diff-chg">The "</ins> <dfn id="in-table0" title= "insertion mode: in table body"><ins class="diff-chg">in table body</ins></dfn> <ins class="diff-chg">" insertion mode</ins></h5> <ins class="diff-chg">When</ins> the insertion mode is " <a href="#in-table0" title="insertion mode: in table body">in table body <del class="diff-old">"</del></a> <ins class= "diff-chg">", tokens must be handled as follows:</ins> <dl class="switch"> <dt>A start tag whose tag name is "tr"</dt> <dd> <a href="#clear3">Clear the stack back to a table body context</a> . (See below.) <a href="#insert0">Insert <del class="diff-old">a tr</del> <ins class="diff-chg">an HTML</ins> element</a> for the token, then switch the insertion mode to " <a href="#in-row" title="insertion mode: in row">in row</a> ". </dd> <dt>A start tag whose tag name is one of: "th", "td"</dt> <dd> <a href="#parse1">Parse error</a> . Act as if a start tag with the tag name "tr" had been seen, then reprocess the current token. </dd> <dt>An end tag whose tag name is one of: "tbody", "tfoot", "thead"</dt> <dd> If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an element in table scope</a> with the same tag name as the token, this is a <a href="#parse1">parse error</a> . Ignore the token. Otherwise: <a href="#clear3">Clear the stack back to a table body context</a> . (See below.) Pop the <a href="#current5">current node</a> from the <a href= "#stack">stack of open elements</a> . Switch the insertion mode to " <a href="#in-table" title= "insertion mode: in table">in table</a> ". </dd> <dt>A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "tfoot", "thead"</dt> <dt>An end tag whose tag name is "table"</dt> <dd> If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have a <code>tbody</code> , <code>thead</code> , or <code>tfoot</code> element in table scope</a> , this is a <a href="#parse1">parse error</a> . Ignore the token. ( <a href="#fragment">fragment case</a> ) Otherwise: <a href="#clear3">Clear the stack back to a table body context</a> . (See below.) Act as if an end tag with the same tag name as the <a href= "#current5">current node</a> ("tbody", "tfoot", or "thead") had been seen, then reprocess the current token. </dd> <dt>An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "td", "th", "tr"</dt> <dd> <a href="#parse1">Parse error</a> . Ignore the token. </dd> <dt>Anything else</dt> <dd> Process the token <del class="diff-old">as if</del> <a href= "#using8"><ins class="diff-chg">using</ins> the <del class= "diff-old">insertion mode</del> <ins class="diff-chg">rules for</ins></a> <del class="diff-old">was</del> <ins class= "diff-chg">the</ins> " <a href="#in-table" title= "insertion mode: in table">in table</a> <del class= "diff-old">".</del> <ins class="diff-chg">"</ins> <ins class= "diff-chg">insertion mode</ins> . </dd> </dl> When the steps above require the UA to <dfn id="clear3">clear the stack back to a table body context</dfn> , it means that the UA must, while the <a href="#current5">current node</a> is not a <code><a href="#tbody">tbody</a></code> , <code><a href= "#tfoot0">tfoot</a></code> , <code><a href= "#thead0">thead</a></code> , or <code><a href= "#html">html</a></code> element, pop elements from the <a href= "#stack">stack of open elements</a> . <del class="diff-old">If this causes any elements to be popped from the stack, then this is a parse error .</del> The <a href="#current5">current node</a> being an <code><a href="#html">html</a></code> element after this process is a <a href="#fragment">fragment case</a> . <del class= "diff-old">If</del> <h5 id="parsing-main-intr"><ins class= "diff-chg">8.2.5.15.</ins> <ins class="diff-chg">The "</ins> <dfn id="in-row" title="insertion mode: in row"><ins class= "diff-chg">in row</ins></dfn> <ins class="diff-chg">" insertion mode</ins></h5> <ins class="diff-chg">When</ins> the insertion mode is " <a href="#in-row" title="insertion mode: in row">in row <del class="diff-old">"</del></a> <ins class="diff-chg">", tokens must be handled as follows:</ins> <dl class="switch"> <dt>A start tag whose tag name is one of: "th", "td"</dt> <dd> <a href="#clear4">Clear the stack back to a table row context</a> . (See below.) <a href="#insert0">Insert an HTML element</a> for the token, then switch the insertion mode to " <a href="#in-cell" title="insertion mode: in cell">in cell</a> ". Insert a marker at the end of the <a href="#list-of4">list of active formatting elements</a> . </dd> <dt>An end tag whose tag name is "tr"</dt> <dd> If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an element in table scope</a> with the same tag name as the token, this is a <a href="#parse1">parse error</a> . Ignore the token. ( <a href="#fragment">fragment case</a> ) Otherwise: <a href="#clear4">Clear the stack back to a table row context</a> . (See below.) Pop the <a href="#current5">current node</a> (which will be a <code><a href="#tr">tr</a></code> element) from the <a href= "#stack">stack of open elements</a> . Switch the insertion mode to " <a href="#in-table0" title= "insertion mode: in table body">in table body</a> ". </dd> <dt>A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "tfoot", "thead", "tr"</dt> <dt>An end tag whose tag name is "table"</dt> <dd> Act as if an end tag with the tag name "tr" had been seen, then, if that token wasn't ignored, reprocess the current token. The fake end tag token here can only be ignored in the <a href="#fragment">fragment case</a> . </dd> <dt>An end tag whose tag name is one of: "tbody", "tfoot", "thead"</dt> <dd> If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an element in table scope</a> with the same tag name as the token, this is a <a href="#parse1">parse error</a> . Ignore the token. Otherwise, act as if an end tag with the tag name "tr" had been seen, then reprocess the current token. </dd> <dt>An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "td", "th"</dt> <dd> <a href="#parse1">Parse error</a> . Ignore the token. </dd> <dt>Anything else</dt> <dd> Process the token <del class="diff-old">as if</del> <a href= "#using8"><ins class="diff-chg">using</ins> the <del class= "diff-old">insertion mode</del> <ins class="diff-chg">rules for</ins></a> <del class="diff-old">was</del> <ins class= "diff-chg">the</ins> " <a href="#in-table" title= "insertion mode: in table">in table</a> <del class= "diff-old">".</del> <ins class="diff-chg">"</ins> <ins class= "diff-chg">insertion mode</ins> . </dd> </dl> When the steps above require the UA to <dfn id="clear4">clear the stack back to a table row context</dfn> , it means that the UA must, while the <a href="#current5">current node</a> is not a <code><a href="#tr">tr</a></code> element or an <code><a href= "#html">html</a></code> element, pop elements from the <a href= "#stack">stack of open elements</a> . <del class="diff-old">If this causes any elements to be popped from the stack, then this is a parse error .</del> The <a href="#current5">current node</a> being an <code><a href="#html">html</a></code> element after this process is a <a href="#fragment">fragment case</a> . <del class= "diff-old">If</del> <h5 id="parsing-main-intd"><ins class= "diff-chg">8.2.5.16.</ins> <ins class="diff-chg">The "</ins> <dfn id="in-cell" title="insertion mode: in cell"><ins class= "diff-chg">in cell</ins></dfn> <ins class="diff-chg">" insertion mode</ins></h5> <ins class="diff-chg">When</ins> the insertion mode is " <a href="#in-cell" title="insertion mode: in cell">in cell <del class="diff-old">"</del></a> <ins class="diff-chg">", tokens must be handled as follows:</ins> <dl class="switch"> <dt>An end tag whose tag name is one of: "td", "th"</dt> <dd> If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an element in table scope</a> with the same tag name as that of the token, then this is a <a href="#parse1">parse error</a> and the token must be ignored. Otherwise: <a href="#generate">Generate implied end tags <del class= "diff-old">, except for elements with the same tag name as the token.</del></a> . Now, if the <a href="#current5">current node</a> is not an element with the same tag name as the token, then this is a <a href="#parse1">parse error</a> . Pop elements from this stack until an element with the same tag name as the token has been popped from the stack. <a href="#clear1">Clear the list of active formatting elements up to the last marker</a> . Switch the insertion mode to " <a href="#in-row" title="insertion mode: in row">in row</a> ". (The <a href= "#current5">current node</a> will be a <code><a href= "#tr">tr</a></code> element at this point.) </dd> <dt>A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "td", "tfoot", "th", "thead", "tr"</dt> <dd> If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title= "has an element in table scope">have a <code>td</code> or <code>th</code> element in table scope</a> , then this is a <a href="#parse1">parse error</a> ; ignore the token. ( <a href= "#fragment">fragment case</a> ) Otherwise, <a href="#close2">close the cell</a> (see below) and reprocess the current token. </dd> <dt>An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html"</dt> <dd> <a href="#parse1">Parse error</a> . Ignore the token. </dd> <dt>An end tag whose tag name is one of: "table", "tbody", "tfoot", "thead", "tr"</dt> <dd> If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an element in table scope</a> with the same tag name as that of the token (which can only happen for "tbody", "tfoot" and "thead", or, in the <a href="#fragment">fragment case</a> ), then this is a <a href="#parse1">parse error</a> and the token must be ignored. Otherwise, <a href="#close2">close the cell</a> (see below) and reprocess the current token. </dd> <dt>Anything else</dt> <dd> Process the token <del class="diff-old">as if</del> <a href= "#using8"><ins class="diff-chg">using</ins> the <del class= "diff-old">insertion mode</del> <ins class="diff-chg">rules for</ins></a> <del class="diff-old">was</del> <ins class= "diff-chg">the</ins> " <a href="#in-body" title= "insertion mode: in body">in body</a> <del class= "diff-old">".</del> <ins class="diff-chg">"</ins> <ins class= "diff-chg">insertion mode</ins> . </dd> </dl> Where the steps above say to <dfn id="close2">close the cell</dfn> , they mean to run the following algorithm: <ol> <li> If the <a href="#stack">stack of open elements</a> <a href= "#have-an0" title="has an element in table scope">has a <code>td</code> element in table scope</a> , then act as if an end tag token with the tag name "td" had been seen. </li> <li> Otherwise, the <a href="#stack">stack of open elements</a> will <a href="#have-an0" title="has an element in table scope">have a <code>th</code> element in table scope</a> ; act as if an end tag token with the tag name "th" had been seen. </li> </ol> The <a href="#stack">stack of open elements</a> cannot have both a <code><a href="#td">td</a></code> and a <code><a href="#th">th</a></code> element <a href="#have-an0" title="has an element in table scope">in table scope</a> at the same time, nor can it have neither when the insertion mode is " <a href="#in-cell" title= "insertion mode: in cell">in cell</a> ". <del class="diff-old">If the insertion mode is</del> <h5 id="parsing-main-inselect"><ins class= "diff-chg">8.2.5.17.</ins> <ins class="diff-chg">The</ins> " <dfn id="in-select" title="insertion mode: in select">in select</dfn> " <ins class="diff-chg">insertion mode</ins></h5> <del class="diff-old">Handle</del> <ins class= "diff-chg">When</ins> the <del class="diff-old">token</del> <ins class="diff-chg">insertion mode</ins> <ins class= "diff-chg">is "</ins> <a href="#in-select" title= "insertion mode: in select"><ins class="diff-chg">in select</ins></a> <ins class="diff-chg">", tokens must be handled</ins> as follows: <dl class="switch"> <dt>A character token</dt> <dd> <del class="diff-old">Append</del> <a href="#insert" title= "insert a character"><ins class="diff-chg">Insert</ins> the token's character</a> <del class="diff-old">to</del> <ins class= "diff-chg">into</ins> the <a href="#current5">current node</a> . </dd> <dt>A comment token</dt> <dd> Append a <code>Comment</code> node to the <a href= "#current5">current node</a> with the <code title="">data</code> attribute set to the data given in the comment token. </dd> <dt>A <ins class="diff-new">DOCTYPE token</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Ignore the token.</ins> </dd> <dt><ins class="diff-new">A start tag whose tag name is "html"</ins></dt> <dd> <ins class="diff-new">Process the token</ins> <a href= "#using8"><ins class="diff-new">using the rules for</ins></a> <ins class="diff-new">the "</ins> <a href="#in-body" title= "insertion mode: in body"><ins class="diff-new">in body</ins></a> <ins class="diff-new">"</ins> <ins class="diff-new">insertion mode</ins> . </dd> <dt><ins class="diff-new">A</ins> start tag whose tag name is "option"</dt> <dd> If the <a href="#current5">current node</a> is an <code>option</code> element, act as if an end tag with the tag name "option" had been seen. <a href="#insert0">Insert an HTML element</a> for the token. </dd> <dt>A start tag whose tag name is "optgroup"</dt> <dd> If the <a href="#current5">current node</a> is an <code>option</code> element, act as if an end tag with the tag name "option" had been seen. If the <a href="#current5">current node</a> is an <code>optgroup</code> element, act as if an end tag with the tag name "optgroup" had been seen. <a href="#insert0">Insert an HTML element</a> for the token. </dd> <dt>An end tag whose tag name is "optgroup"</dt> <dd> First, if the <a href="#current5">current node</a> is an <code>option</code> element, and the node immediately before it in the <a href="#stack">stack of open elements</a> is an <code>optgroup</code> element, then act as if an end tag with the tag name "option" had been seen. If the <a href="#current5">current node</a> is an <code>optgroup</code> element, then pop that node from the <a href= "#stack">stack of open elements</a> . Otherwise, this is a <a href= "#parse1">parse error</a> , ignore the token. </dd> <dt>An end tag whose tag name is "option"</dt> <dd> If the <a href="#current5">current node</a> is an <code>option</code> element, then pop that node from the <a href= "#stack">stack of open elements</a> . Otherwise, this is a <a href= "#parse1">parse error</a> , ignore the token. </dd> <dt>An end tag whose tag name is "select"</dt> <dd> If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an element in table scope</a> with the same tag name as the token, this is a <a href="#parse1">parse error</a> . Ignore the token. ( <a href="#fragment">fragment case</a> ) Otherwise: Pop elements from the <a href="#stack">stack of open elements</a> until a <code>select</code> element has been popped from the stack. <a href="#reset">Reset the insertion mode appropriately</a> . </dd> <dt>A start tag whose tag name is "select"</dt> <dd> <a href="#parse1">Parse error</a> . Act as if the token had been an end tag with the tag name "select" instead. </dd> <dt><ins class="diff-new">A start tag whose tag name is one of: "input", "textarea"</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Act as if an end tag with the tag name "select" had been seen, and reprocess the token.</ins> </dd> <dt><ins class="diff-new">An end-of-file token</ins></dt> <dd> <ins class="diff-new">If the</ins> <a href= "#current5"><ins class="diff-new">current node</ins></a> <ins class="diff-new">is not the root</ins> <code><a href= "#html"><ins class="diff-new">html</ins></a></code> <ins class= "diff-new">element, then this is a</ins> <a href= "#parse1"><ins class="diff-new">parse error.</ins></a> . <ins class="diff-new">It can only be the</ins> <a href="#current5"><ins class="diff-new">current node</ins></a> <ins class="diff-new">in the</ins> <a href="#fragment"><ins class= "diff-new">fragment case</ins></a> . <a href="#stops"><ins class="diff-new">Stop parsing.</ins></a> </dd> <dt><ins class="diff-new">Anything else</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Ignore the token.</ins> </dd> </dl> <h5 id="parsing-main-inselectintable"><ins class="diff-new">8.2.5.18.</ins> <ins class= "diff-new">The "</ins> <dfn id="in-select0" title= "insertion mode: in select in table"><ins class="diff-new">in select in table</ins></dfn> <ins class="diff-new">" insertion mode</ins></h5> <ins class="diff-new">When the</ins> <ins class= "diff-new">insertion mode</ins> <ins class="diff-new">is "</ins> <a href="#in-select0" title= "insertion mode: in select in table"><ins class="diff-new">in select in table</ins></a> <ins class="diff-new">", tokens must be handled as follows:</ins> <dl class="switch"> <dt><ins class="diff-new">A start tag whose tag name is one of: "caption", "table", "tbody", "tfoot", "thead", "tr", "td", "th"</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Act as if an end tag with the tag name "select" had been seen, and reprocess the token.</ins> </dd> <dt>An end tag whose tag name is one of: "caption", "table", "tbody", "tfoot", "thead", "tr", "td", "th"</dt> <dd> <a href="#parse1">Parse error</a> . If the <a href="#stack">stack of open elements</a> <a href= "#have-an0">has an element in table scope</a> with the same tag name as that of the token, then act as if an end tag with the tag name "select" had been seen, and reprocess the token. Otherwise, ignore the token. </dd> <dt>Anything else</dt> <dd> <ins class="diff-new">Process the token</ins> <a href= "#using8"><ins class="diff-new">using the rules for</ins></a> <ins class="diff-new">the "</ins> <a href="#in-select" title= "insertion mode: in select"><ins class="diff-new">in select</ins></a> <ins class="diff-new">"</ins> <ins class= "diff-new">insertion mode</ins> . </dd> </dl> <h5 id="parsing-main-inforeign"><ins class= "diff-chg">8.2.5.19.</ins> <ins class="diff-chg">The "</ins> <dfn id="in-foreign" title= "insertion mode: in foreign content"><ins class="diff-chg">in foreign content</ins></dfn> <ins class="diff-chg">" insertion mode</ins></h5> <ins class="diff-chg">When the</ins> <ins class= "diff-chg">insertion mode</ins> <ins class="diff-chg">is "</ins> <a href="#in-foreign" title= "insertion mode: in foreign content"><ins class="diff-chg">in foreign content</ins></a> <ins class="diff-chg">", tokens must be handled as follows:</ins> <dl class="switch"> <dt><ins class="diff-chg">A character token</ins></dt> <dd> <a href="#insert" title="insert a character"><ins class= "diff-chg">Insert the token's character</ins></a> <ins class= "diff-chg">into the</ins> <a href="#current5"><ins class= "diff-chg">current node</ins></a> . </dd> <dt><ins class="diff-chg">A comment token</ins></dt> <dd> <ins class="diff-chg">Append a</ins> <code><ins class= "diff-chg">Comment</ins></code> <ins class="diff-chg">node to the</ins> <a href="#current5"><ins class="diff-chg">current node</ins></a> <ins class="diff-chg">with the</ins> <code title= ""><ins class="diff-chg">data</ins></code> <ins class= "diff-chg">attribute set to the data given in the comment token.</ins> </dd> <dt><ins class="diff-chg">A DOCTYPE token</ins></dt> <dd> <a href="#parse1">Parse error</a> . Ignore the token. <del class="diff-old">If</del></dd> <dt><ins class="diff-chg">A start tag whose tag name is neither "mglyph" nor "malignmark", if</ins> the <a href= "#current5"><ins class="diff-chg">current node</ins></a> <ins class="diff-chg">is an</ins> <code title=""><ins class= "diff-chg">mi</ins></code> <ins class="diff-chg">element in the</ins> <a href="#mathml0"><ins class="diff-chg">MathML namespace</ins></a> .</dt> <dt><ins class="diff-chg">A start tag whose tag name is neither "mglyph" nor "malignmark", if the</ins> <a href= "#current5"><ins class="diff-chg">current node</ins></a> <ins class="diff-chg">is an</ins> <code title=""><ins class= "diff-chg">mo</ins></code> <ins class="diff-chg">element in the</ins> <a href="#mathml0"><ins class="diff-chg">MathML namespace</ins></a> .</dt> <dt><ins class="diff-chg">A start tag whose tag name is neither "mglyph" nor "malignmark", if the</ins> <a href= "#current5"><ins class="diff-chg">current node</ins></a> <ins class="diff-chg">is an</ins> <code title=""><ins class= "diff-chg">mn</ins></code> <ins class="diff-chg">element in the</ins> <a href="#mathml0"><ins class="diff-chg">MathML namespace</ins></a> .</dt> <dt><ins class="diff-chg">A start tag whose tag name is neither "mglyph" nor "malignmark", if the</ins> <a href= "#current5"><ins class="diff-chg">current node</ins></a> <ins class="diff-chg">is an</ins> <code title=""><ins class= "diff-chg">ms</ins></code> <ins class="diff-chg">element in the</ins> <a href="#mathml0"><ins class="diff-chg">MathML namespace</ins></a> .</dt> <dt><ins class="diff-chg">A start tag whose tag name is neither "mglyph" nor "malignmark", if the</ins> <a href= "#current5"><ins class="diff-chg">current node</ins></a> <ins class="diff-chg">is an</ins> <code title=""><ins class= "diff-chg">mtext</ins></code> <ins class="diff-chg">element in the</ins> <a href="#mathml0"><ins class="diff-chg">MathML namespace</ins></a> .</dt> <dt><ins class="diff-chg">A start tag, if the</ins> <a href= "#current5"><ins class="diff-chg">current node</ins></a> <ins class="diff-chg">is an element in the</ins> <a href= "#html-namespace0"><ins class="diff-chg">HTML namespace</ins></a> .</dt> <dt><ins class="diff-chg">An end tag</ins></dt> <dd> <ins class="diff-chg">Process the token</ins> <a href= "#using8"><ins class="diff-chg">using the rules for</ins></a> <ins class="diff-chg">the</ins> <a href="#secondary1"><ins class= "diff-chg">secondary</ins> insertion mode</a> . <ins class="diff-new">If, after doing so, the</ins> <ins class="diff-new">insertion mode</ins> <ins class= "diff-new">is still "</ins> <a href="#in-foreign" title= "insertion mode: in foreign content"><ins class="diff-new">in foreign content</ins></a> <ins class="diff-new">", but there</ins> is <ins class="diff-new">no element in scope that has a namespace other than the</ins> <a href="#html-namespace0"><ins class= "diff-new">HTML namespace</ins></a> ,<ins class="diff-new">switch the</ins> <ins class="diff-new">insertion mode</ins> <ins class="diff-new">to the</ins> <a href= "#secondary1"><ins class="diff-new">secondary insertion mode</ins></a> . </dd> <dt><ins class="diff-new">A start tag whose tag name is one of: "b", "big", "blockquote", "body", "br", "center", "code", "dd", "div", "dl", "dt" , "em", "embed", "font", "h1", "h2", "h3", "h4", "h5", "h6" , "hr", "i", "img", "li", "listing" , "menu", "meta", "nobr", "ol" , "p", "pre", "ruby", "s", "small", "span", "strong", "strike" , "sub", "sup", "table", "tt", "u", "ul", "var"</ins></dt> <dt><ins class="diff-new">An end-of-file token</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> . <ins class="diff-new">Pop elements from the</ins> <a href= "#stack"><ins class="diff-new">stack of open elements</ins></a> <ins class="diff-new">until the</ins> <a href= "#current5"><ins class="diff-new">current node</ins></a> <ins class="diff-new">is in the</ins> <a href= "#html-namespace0"><ins class="diff-new">HTML namespace</ins></a> . <ins class="diff-new">Switch the</ins> <ins class= "diff-new">insertion mode</ins> <ins class="diff-new">to the</ins> <a href="#secondary1"><ins class="diff-new">secondary insertion mode</ins></a> ,<ins class="diff-new">and reprocess the token.</ins> </dd> <dt><ins class="diff-new">Any other start tag</ins></dt> <dd> <a href="#adjust"><ins class="diff-new">Adjust foreign attributes</ins></a> <ins class="diff-new">for the token. (This fixes the use of namespaced attributes, in particular XLink in SVG.)</ins> <a href="#insert1"><ins class="diff-new">Insert a foreign element</ins></a> <ins class="diff-new">for the token, in the same namespace as the</ins> <a href="#current5"><ins class= "diff-new">current node</ins></a> . <ins class="diff-new">If the token has its</ins> <ins class= "diff-new">self-closing flag</ins> <ins class="diff-new">set, pop the</ins> <a href="#current5"><ins class="diff-new">current node</ins></a> <ins class="diff-new">off the</ins> <a href= "#stack"><ins class="diff-new">stack of open elements</ins></a> <ins class="diff-new">and</ins> <a href="#acknowledged" title= "acknowledge self-closing flag"><ins class="diff-new">acknowledge the token's</ins> <ins class="diff-new">self-closing flag</ins></a> . </dd> </dl> <h5 id="parsing-main-afterbody"><ins class= "diff-new">8.2.5.20.</ins> <ins class="diff-new">The</ins> " <dfn id="after5" title="insertion mode: after body">after body</dfn> " <ins class="diff-chg">insertion mode</ins></h5> <del class="diff-old">Handle</del> <ins class= "diff-chg">When</ins> the <del class="diff-old">token</del> <ins class="diff-chg">insertion mode</ins> <ins class= "diff-chg">is "</ins> <a href="#after5" title= "insertion mode: after body"><ins class="diff-chg">after body</ins></a> <ins class="diff-chg">", tokens must be handled</ins> as follows: <dl class="switch"> <dt>A character token that is one of one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</dt> <dd> Process the token <del class="diff-old">as it would be processed if</del> <a href="#using8"><ins class="diff-chg">using</ins> the <del class="diff-old">insertion mode</del> <ins class= "diff-chg">rules for</ins></a> <del class="diff-old">was</del> <ins class="diff-chg">the</ins> " <a href="#in-body" title= "insertion mode: in body">in body</a> <del class= "diff-old">".</del> <ins class="diff-chg">"</ins> <ins class= "diff-chg">insertion mode</ins> . </dd> <dt>A comment token</dt> <dd> Append a <code>Comment</code> node to the first element in the <a href="#stack">stack of open elements</a> (the <code><a href= "#html">html</a></code> element), with the <code title= "">data</code> attribute set to the data given in the comment token. </dd> <dt><ins class="diff-new">A DOCTYPE token</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Ignore the token.</ins> </dd> <dt><ins class="diff-new">A start tag whose tag name is "html"</ins></dt> <dd> <ins class="diff-new">Process the token</ins> <a href= "#using8"><ins class="diff-new">using the rules for</ins></a> <ins class="diff-new">the "</ins> <a href="#in-body" title= "insertion mode: in body"><ins class="diff-new">in body</ins></a> <ins class="diff-new">"</ins> <ins class="diff-new">insertion mode</ins> . </dd> <dt>An end tag whose tag name is "html"</dt> <dd> If the parser was originally created as part of the <a href= "#html-fragment0">HTML fragment parsing algorithm</a> , this is a <a href="#parse1">parse error</a> ; ignore the token. <del class= "diff-old">(The element will be an html element in this case.)</del> ( <a href="#fragment">fragment case</a> ) Otherwise, switch <del class="diff-old">to</del> the <del class= "diff-old">trailing end phase .</del> <ins class= "diff-chg">insertion mode</ins> <ins class="diff-chg">to "</ins> <a href="#after7" title= "insertion mode: after after body"><ins class="diff-chg">after after body</ins></a> <ins class="diff-chg">".</ins> </dd> <dt><ins class="diff-chg">An end-of-file token</ins></dt> <dd> <a href="#stops"><ins class="diff-chg">Stop parsing.</ins></a> </dd> <dt>Anything else</dt> <dd> <a href="#parse1">Parse error</a> . <del class= "diff-old">Set</del> <ins class="diff-chg">Switch</ins> the insertion mode to " <a href="#in-body" title= "insertion mode: in body">in body</a> " and reprocess the token. </dd> </dl> <del class="diff-old">If the insertion mode is</del> <h5 id="parsing-main-inframeset"><ins class= "diff-chg">8.2.5.21.</ins> <ins class="diff-chg">The</ins> " <dfn id="in-frameset" title="insertion mode: in frameset">in frameset</dfn> " <ins class="diff-chg">insertion mode</ins></h5> <del class="diff-old">Handle</del> <ins class= "diff-chg">When</ins> the <del class="diff-old">token</del> <ins class="diff-chg">insertion mode</ins> <ins class= "diff-chg">is "</ins> <a href="#in-frameset" title= "insertion mode: in frameset"><ins class="diff-chg">in frameset</ins></a> <ins class="diff-chg">", tokens must be handled</ins> as follows: <dl class="switch"> <dt>A character token that is one of one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</dt> <dd> <del class="diff-old">Append</del> <a href="#insert" title= "insert a character"><ins class="diff-chg">Insert</ins> the character</a> <del class="diff-old">to</del> <ins class= "diff-chg">into</ins> the <a href="#current5">current node</a> . </dd> <dt>A comment token</dt> <dd> Append a <code>Comment</code> node to the <a href= "#current5">current node</a> with the <code title="">data</code> attribute set to the data given in the comment token. </dd> <dt>A <ins class="diff-new">DOCTYPE token</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Ignore the token.</ins> </dd> <dt><ins class="diff-new">A start tag whose tag name is "html"</ins></dt> <dd> <ins class="diff-new">Process the token</ins> <a href= "#using8"><ins class="diff-new">using the rules for</ins></a> <ins class="diff-new">the "</ins> <a href="#in-body" title= "insertion mode: in body"><ins class="diff-new">in body</ins></a> <ins class="diff-new">"</ins> <ins class="diff-new">insertion mode</ins> . </dd> <dt><ins class="diff-new">A</ins> start tag whose tag name is "frameset"</dt> <dd> <a href="#insert0">Insert <del class="diff-old">a frameset</del> <ins class="diff-chg">an HTML</ins> element</a> for the token. </dd> <dt>An end tag whose tag name is "frameset"</dt> <dd> If the <a href="#current5">current node</a> is the root <code><a href="#html">html</a></code> element, then this is a <a href="#parse1">parse error</a> ; ignore the token. ( <a href= "#fragment">fragment case</a> ) Otherwise, pop the <a href="#current5">current node</a> from the <a href="#stack">stack of open elements</a> . If the parser was not originally created as part of the <a href="#html-fragment0">HTML fragment parsing algorithm</a> ( <a href="#fragment">fragment case</a> ), and the <a href= "#current5">current node</a> is no longer a <code>frameset</code> element, then <del class="diff-old">change</del> <ins class= "diff-chg">switch</ins> the insertion mode to " <a href="#after6" title="insertion mode: after frameset">after frameset</a> ". </dd> <dt>A start tag whose tag name is "frame"</dt> <dd> <a href="#insert0">Insert an HTML element</a> for the token. Immediately pop the <a href="#current5">current node</a> off the <a href="#stack">stack of open elements</a> . <a href="#acknowledged" title= "acknowledge self-closing flag"><ins class="diff-new">Acknowledge the token's</ins> <ins class="diff-new">self-closing flag</ins></a> ,<ins class="diff-new">if it is set.</ins> </dd> <dt>A start tag whose tag name is "noframes"</dt> <dd> Process the token <del class="diff-old">as if</del> <a href= "#using8"><ins class="diff-chg">using</ins> the <ins class= "diff-chg">rules for</ins></a> <ins class="diff-chg">the "</ins> <a href="#in-head" title="insertion mode: in head"><ins class= "diff-chg">in head</ins></a> <ins class="diff-chg">"</ins> insertion mode . </dd> <dt><ins class="diff-new">An end-of-file token</ins></dt> <dd> <ins class="diff-new">If the</ins> <a href= "#current5"><ins class="diff-new">current node</ins></a> <ins class="diff-new">is not the root</ins> <code><a href= "#html"><ins class="diff-new">html</ins></a></code> <ins class= "diff-new">element, then this is a</ins> <a href= "#parse1"><ins class="diff-new">parse error.</ins></a> . <ins class="diff-new">It can only be the</ins> <a href="#current5"><ins class="diff-new">current node</ins></a> <del class="diff-old">had been "</del> in <del class= "diff-old">body</del> <ins class="diff-chg">the</ins> <a href= "#fragment"><ins class="diff-chg">fragment case</ins></a> . <a href="#stops"><ins class="diff-chg">Stop parsing.</ins></a> <del class="diff-old">".</del> </dd> <dt>Anything else</dt> <dd> <a href="#parse1">Parse error</a> . Ignore the token. </dd> </dl> <del class="diff-old">If the insertion mode is</del> <h5 id="parsing-main-afterframeset"><ins class= "diff-chg">8.2.5.22.</ins> <ins class="diff-chg">The</ins> " <dfn id="after6" title="insertion mode: after frameset">after frameset</dfn> " <ins class="diff-chg">insertion mode</ins></h5> <del class="diff-old">Handle</del> <ins class= "diff-chg">When</ins> the <del class="diff-old">token</del> <ins class="diff-chg">insertion mode</ins> <ins class= "diff-chg">is "</ins> <a href="#after6" title= "insertion mode: after frameset"><ins class="diff-chg">after frameset</ins></a> <ins class="diff-chg">", tokens must be handled</ins> as follows: <dl class="switch"> <dt>A character token that is one of one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</dt> <dd> <del class="diff-old">Append</del> <a href="#insert" title= "insert a character"><ins class="diff-chg">Insert</ins> the character</a> <del class="diff-old">to</del> <ins class= "diff-chg">into</ins> the <a href="#current5">current node</a> . </dd> <dt>A comment token</dt> <dd> Append a <code>Comment</code> node to the <a href= "#current5">current node</a> with the <code title="">data</code> attribute set to the data given in the comment token. </dd> <dt><ins class="diff-new">A DOCTYPE token</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Ignore the token.</ins> </dd> <dt><ins class="diff-new">A start tag whose tag name is "html"</ins></dt> <dd> <ins class="diff-new">Process the token</ins> <a href= "#using8"><ins class="diff-new">using the rules for</ins></a> <ins class="diff-new">the "</ins> <a href="#in-body" title= "insertion mode: in body"><ins class="diff-new">in body</ins></a> <ins class="diff-new">"</ins> <ins class="diff-new">insertion mode</ins> . </dd> <dt>An end tag whose tag name is "html"</dt> <dd> Switch <del class="diff-old">to</del> the <del class= "diff-old">trailing end phase .</del> <ins class= "diff-chg">insertion mode</ins> <ins class="diff-chg">to "</ins> <a href="#after8" title= "insertion mode: after after frameset"><ins class="diff-chg">after after frameset</ins></a> <ins class="diff-chg">".</ins> </dd> <dt>A start tag whose tag name is "noframes"</dt> <dd> Process the token <del class="diff-old">as if</del> <a href= "#using8"><ins class="diff-chg">using</ins> the <del class= "diff-old">insertion mode</del> <ins class="diff-chg">rules for</ins></a> <del class="diff-old">had been</del> <ins class= "diff-chg">the</ins> " <a href="#in-head" title= "insertion mode: in head">in <del class="diff-old">body</del> <ins class="diff-chg">head</ins></a> <del class="diff-old">".</del> <ins class="diff-chg">"</ins> <ins class="diff-chg">insertion mode</ins> . </dd> <dt><ins class="diff-chg">An end-of-file token</ins></dt> <dd> <a href="#stops"><ins class="diff-chg">Stop parsing.</ins></a> </dd> <dt>Anything else</dt> <dd> <a href="#parse1">Parse error</a> . Ignore the token. </dd> </dl> This doesn't handle UAs that don't support frames, or that do support frames but want to show the NOFRAMES content. Supporting the former is easy; supporting the latter is harder. <h5 id="the-after0"><del class= "diff-old">8.2.4.4.</del> <ins class= "diff-chg">8.2.5.23.</ins> The <del class= "diff-old">trailing end phase</del> <ins class="diff-chg">"</ins> <dfn id="after7" title= "insertion mode: after after body"><ins class="diff-chg">after after body</ins></dfn> <ins class="diff-chg">" insertion mode</ins></h5> <del class="diff-old">After</del> <ins class= "diff-chg">When</ins> the <del class="diff-old">main phase , as each token</del> <ins class="diff-chg">insertion mode</ins> is <del class="diff-old">emitted from the tokenisation</del> <ins class="diff-chg">"</ins> <a href="#after7" title="insertion mode: after after body"><ins class= "diff-chg">after after body</ins></a> <del class="diff-old">stage, it</del> <ins class="diff-chg">", tokens</ins> must be <del class= "diff-old">processed</del> <ins class="diff-chg">handled</ins> as <del class="diff-old">described in this section.</del> <ins class= "diff-chg">follows:</ins> <dl class="switch"> <dt>A <del class="diff-old">DOCTYPE token Parse error . Ignore the token. A</del> comment token</dt> <dd> Append a <code>Comment</code> node to the <code>Document</code> object with the <code title="">data</code> attribute set to the data given in the comment token. </dd> <dt>A <ins class="diff-new">DOCTYPE token</ins></dt> <dt><ins class="diff-new">A</ins> character token that is one of one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</dt> <dt><ins class="diff-new">A start tag whose tag name is "html"</ins></dt> <dd> Process the token <del class="diff-old">as it would</del> <a href="#using8"><ins class="diff-chg">using the rules for</ins></a> <ins class="diff-chg">the "</ins> <a href="#in-body" title="insertion mode: in body"><ins class="diff-chg">in body</ins></a> <ins class="diff-chg">"</ins> <ins class= "diff-chg">insertion mode</ins> . </dd> <dt><ins class="diff-chg">An end-of-file token</ins></dt> <dd> <a href="#stops"><ins class="diff-chg">Stop parsing</ins></a> . </dd> <dt><ins class="diff-chg">Anything else</ins></dt> <dd> <a href="#parse1"><ins class="diff-chg">Parse error</ins></a> .<ins class="diff-chg">Switch the</ins> <ins class= "diff-chg">insertion mode</ins> <ins class="diff-chg">to "</ins> <a href="#in-body" title= "insertion mode: in body"><ins class="diff-chg">in body</ins></a> <ins class="diff-chg">" and reprocess the token.</ins> </dd> </dl> <h5 id="the-after1"><ins class= "diff-chg">8.2.5.24.</ins> <ins class="diff-chg">The "</ins> <dfn id="after8" title= "insertion mode: after after frameset"><ins class="diff-chg">after after frameset</ins></dfn> <ins class="diff-chg">" insertion mode</ins></h5> <ins class="diff-chg">When the</ins> <ins class= "diff-chg">insertion mode</ins> <ins class="diff-chg">is "</ins> <a href="#after8" title= "insertion mode: after after frameset"><ins class="diff-chg">after after frameset</ins></a> <ins class="diff-chg">", tokens must</ins> be <del class="diff-old">processed</del> <ins class= "diff-chg">handled as follows:</ins> <dl class="switch"> <dt><ins class="diff-chg">A comment token</ins></dt> <dd> <ins class="diff-chg">Append a</ins> <code><ins class= "diff-chg">Comment</ins></code> <ins class="diff-chg">node to the</ins> <code><ins class="diff-chg">Document</ins></code> <ins class="diff-chg">object with the</ins> <code title= ""><ins class="diff-chg">data</ins></code> <ins class= "diff-chg">attribute set to the data given</ins> in the <del class= "diff-old">main phase .</del> <ins class="diff-chg">comment token.</ins> </dd> <dt>A <ins class="diff-new">DOCTYPE token</ins></dt> <dt><ins class="diff-new">A</ins> character token that is <del class="diff-old">not</del> <ins class="diff-chg">one of</ins> one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF), or U+0020 SPACE</dt> <dt>A start tag <del class="diff-old">token An end</del> <ins class="diff-chg">whose</ins> tag <del class= "diff-old">token</del> <ins class="diff-chg">name is "html"</ins></dt> <dd> <del class="diff-old">Parse error . Switch back to</del> <ins class="diff-chg">Process</ins> the <del class="diff-old">main phase</del> <ins class="diff-chg">token</ins> <a href= "#using8"><ins class="diff-chg">using the rules for</ins></a> <del class="diff-old">and reprocess</del> the <del class= "diff-old">token.</del> <ins class="diff-chg">"</ins> <a href= "#in-body" title="insertion mode: in body"><ins class="diff-chg">in body</ins></a> <ins class="diff-chg">"</ins> <ins class= "diff-chg">insertion mode</ins> . </dd> <dt>An end-of-file token</dt> <dd> <a href="#stops">Stop parsing</a> . </dd> <dt><ins class="diff-new">Anything else</ins></dt> <dd> <a href="#parse1"><ins class="diff-new">Parse error</ins></a> .<ins class="diff-new">Switch the</ins> <ins class= "diff-new">insertion mode</ins> <ins class="diff-new">to "</ins> <a href="#in-frameset" title= "insertion mode: in frameset"><ins class="diff-new">in frameset</ins></a> <ins class="diff-new">" and reprocess the token.</ins> </dd> </dl> <h4 id="the-end"><del class= "diff-old">8.2.5.</del> <ins class="diff-chg">8.2.6</ins> The <del class="diff-old">End</del> <ins class= "diff-chg">end</ins></h4> Once the user agent <dfn id="stops" title="stop parsing">stops parsing</dfn> the document, the user agent must follow the steps in this section. First, the <a href="#current"><ins class="diff-new">current document readiness</ins></a> <ins class="diff-new">must be set to "interactive".</ins> <ins class="diff-new">Then, the</ins> rules for <a href= "#when-a">when a script completes loading</a> start applying (script execution is no longer managed by the parser). If any of the scripts in the <a href="#list-of1">list of scripts that will execute as soon as possible</a> have completed loading , or if the <a href="#list-of0">list of scripts that will execute asynchronously</a> is not empty and the first script in that list has completed loading , then the user agent must act as if those scripts just completed loading, following the rules given for that in the <code><a href= "#script1">script</a></code> element definition. Then, if the <a href="#list-of">list of scripts that will execute when the document has finished parsing</a> is not empty, and the first item in this list has already completed loading , then the user agent must act as if that script just finished loading. By this point, there will be no scripts that have loaded but have not yet been executed. The user agent must then <a href="#firing2">fire a simple event</a> called <code title= "event-DOMContentLoaded">DOMContentLoaded</code> at the <code>Document</code> . Once everything that <dfn id="delays" title= "delay the load event">delays the load event</dfn> has completed, the user agent must <ins class="diff-new">set the</ins> <a href= "#current"><ins class="diff-new">current document readiness</ins></a> <ins class="diff-new">to "complete", and then</ins> <a href="#firing4" title="fire a load event">fire a <code title="event-load">load</code> event</a> at <a href= "#the-body1">the <code>body</code> element</a> . delaying the load event for things like image loads allows for intranet port scans (even without javascript!). Should we really encode that into the spec? <h3 id="namespaces"><del class= "diff-old">8.3.</del> <ins class="diff-chg">8.3</ins> Namespaces</h3> The <dfn id="html-namespace0">HTML namespace</dfn> is: <code>http://www.w3.org/1999/xhtml</code> <ins class="diff-chg">The</ins> <dfn id="mathml0"><ins class= "diff-chg">MathML namespace</ins></dfn> <ins class= "diff-chg">is:</ins> <code><ins class= "diff-chg">http://www.w3.org/1998/Math/MathML</ins></code> <ins class="diff-chg">The</ins> <dfn id= "svg-namespace"><ins class="diff-chg">SVG namespace</ins></dfn> <ins class="diff-chg">is:</ins> <code><ins class= "diff-chg">http://www.w3.org/2000/svg</ins></code> <ins class="diff-chg">The</ins> <dfn id="xlink"><ins class= "diff-chg">XLink namespace</ins></dfn> <ins class= "diff-chg">is:</ins> <code><ins class= "diff-chg">http://www.w3.org/1999/xlink</ins></code> <ins class="diff-chg">The</ins> <dfn id= "xml-namespace"><ins class="diff-chg">XML namespace</ins></dfn> <ins class="diff-chg">is:</ins> <code><ins class= "diff-chg">http://www.w3.org/XML/1998/namespace</ins></code> <ins class="diff-chg">The</ins> <dfn id="xmlns"><ins class= "diff-chg">XMLNS namespace</ins></dfn> <ins class= "diff-chg">is:</ins> <code><ins class= "diff-chg">http://www.w3.org/2000/xmlns/</ins></code> <h3 id="serializing"><del class= "diff-old">8.4.</del> <ins class="diff-chg">8.4</ins> <del class="diff-old">Serialising</del> <ins class= "diff-chg">Serializing</ins> HTML fragments</h3> The following steps form the <dfn id="html-fragment">HTML fragment <del class="diff-old">serialisation</del> <ins class= "diff-chg">serialization</ins> algorithm</dfn> . The algorithm takes as input a DOM <code>Element</code> or <code>Document</code> , referred to as <var title="">the node</var> , and either returns a string or raises an exception. This algorithm <del class= "diff-old">serialises</del> <ins class="diff-chg">serializes</ins> the children of the node being <del class= "diff-old">serialised,</del> <ins class= "diff-chg">serialized,</ins> not the node itself. <ol> <li> Let <var title="">s</var> be a string, and initialise it to the empty string. </li> <li> For each child node <del class="diff-old">child</del> of <var title="">the node</var> , in <a href="#tree-order">tree order</a> , <del class="diff-old">append</del> <ins class= "diff-chg">run the following steps:</ins> <ol> <li> <ins class="diff-chg">Let</ins> <var title=""><ins class= "diff-chg">current node</ins></var> <ins class="diff-chg">be the child node being processed.</ins> </li> <li> <ins class="diff-chg">Append</ins> the appropriate string from the following list to <var title="">s</var> : <dl class="switch"> <dt>If <del class="diff-old">the child</del> <var title= ""><ins class="diff-chg">current</ins> node</var> is an <code title="">Element</code></dt> <dd> Append a U+003C LESS-THAN SIGN ( <code title=""><</code> ) character, followed by the element's tag name. (For nodes created by the <a href="#html-0">HTML parser</a> , <code title= "">Document.createElement()</code> , or <code title= "">Document.renameNode()</code> , the tag name will be lowercase.) For each attribute that the element has, append a U+0020 SPACE character, the attribute's name (which, for attributes set by the <a href="#html-0">HTML parser</a> or by <code title= "">Element.setAttributeNode()</code> or <code title= "">Element.setAttribute()</code> , will be lowercase), a U+003D EQUALS SIGN ( <code title="">=</code> ) character, a U+0022 QUOTATION MARK ( <code title="">"</code> ) character, the attribute's value, <a href="#escapingString" title= "escaping a string">escaped as described below <del class= "diff-old">,</del></a> <ins class="diff-chg">in</ins> <ins class="diff-chg">attribute mode</ins> , and a second U+0022 QUOTATION MARK ( <code title="">"</code> ) character. While the exact order of attributes is UA-defined, and may depend on factors such as the order that the attributes were given in the original markup, the sort order must be stable, such that consecutive invocations of this algorithm <del class= "diff-old">serialise</del> <ins class="diff-chg">serialize</ins> an element's attributes in the same order. Append a U+003E GREATER-THAN SIGN ( <code title="">></code> ) character. If <del class="diff-old">the child</del> <var title= ""><ins class="diff-chg">current</ins> node</var> is an <code><a href="#area">area</a></code> , <code><a href= "#base">base</a></code> , <code>basefont</code> , <code>bgsound</code> , <code><a href="#br">br</a></code> , <code><a href="#col">col</a></code> , <code><a href= "#embed">embed</a></code> , <code>frame</code> , <code><a href= "#hr">hr</a></code> , <code><a href="#img">img</a></code> , <code>input</code> , <code><a href="#link">link</a></code> , <code><a href="#meta0">meta</a></code> , <code><a href= "#param">param</a></code> , <code>spacer</code> , or <code>wbr</code> element, then continue on to the next child node at this point. If <del class="diff-old">the child</del> <var title= ""><ins class="diff-chg">current</ins> node</var> is a <code><a href="#pre">pre</a></code> <del class="diff-old">or</del> <code>textarea</code> , <ins class="diff-new">or</ins> <code><ins class="diff-new">listing</ins></code> element, append a U+000A LINE FEED (LF) character. Append the value of running the <a href="#html-fragment">HTML fragment <del class="diff-old">serialisation</del> <ins class= "diff-chg">serialization</ins> algorithm</a> on the <var title= ""><del class="diff-old">child</del> <ins class="diff-chg">current node</ins></var> element (thus recursing into this algorithm for that element), followed by a U+003C LESS-THAN SIGN ( <code title= ""><</code> ) character, a U+002F SOLIDUS ( <code title= "">/</code> ) character, the element's tag name again, and finally a U+003E GREATER-THAN SIGN ( <code title="">></code> ) character. </dd> <dt>If <del class="diff-old">the child</del> <var title= ""><ins class="diff-chg">current</ins> node</var> is a <code title= "">Text</code> or <code title="">CDATASection</code> node</dt> <dd> If one of the ancestors of <del class="diff-old">the child</del> <var title=""><ins class="diff-chg">current</ins> node</var> is a <code><a href="#style1">style</a></code> , <code><a href= "#script1">script</a></code> , <code>xmp</code> , <code><a href= "#iframe">iframe</a></code> , <code>noembed</code> , <code>noframes</code> , <code><a href= "#noscript">noscript</a></code> , or <code>plaintext</code> element, then append the value of <del class="diff-old">the</del> <var title=""><del class="diff-old">child</del> <ins class= "diff-chg">current node</ins></var> <del class= "diff-old">node's</del> <ins class="diff-chg">'s</ins> <code title= "">data</code> DOM attribute literally. Otherwise, append the value of <del class="diff-old">the</del> <var title=""><del class="diff-old">child</del> <ins class= "diff-chg">current node</ins></var> <del class= "diff-old">node's</del> <ins class="diff-chg">'s</ins> <code title= "">data</code> DOM attribute, <a href="#escapingString" title= "escaping a string">escaped as described below</a> . </dd> <dt>If <del class="diff-old">the child</del> <var title= ""><ins class="diff-chg">current</ins> node</var> is a <code title= "">Comment</code></dt> <dd> Append the literal string <code><!--</code> (U+003C LESS-THAN SIGN, U+0021 EXCLAMATION MARK, U+002D HYPHEN-MINUS, U+002D HYPHEN-MINUS), followed by the value of <del class= "diff-old">the</del> <var title=""><del class= "diff-old">child</del> <ins class="diff-chg">current node</ins></var> <del class="diff-old">node's</del> <ins class= "diff-chg">'s</ins> <code title="">data</code> DOM attribute, followed by the literal string <code>--></code> (U+002D HYPHEN-MINUS, U+002D HYPHEN-MINUS, U+003E GREATER-THAN SIGN). </dd> <dt>If <var title=""><ins class="diff-new">current node</ins></var> <ins class="diff-new">is a</ins> <code title=""><ins class= "diff-new">ProcessingInstruction</ins></code></dt> <dd> <ins class="diff-new">Append</ins> the <del class= "diff-old">child</del> <ins class="diff-chg">literal string</ins> <code><ins class="diff-chg"><?</ins></code> <ins class= "diff-chg">(U+003C LESS-THAN SIGN, U+003F QUESTION MARK), followed by the value of</ins> <var title=""><ins class= "diff-chg">current</ins> node</var> <ins class="diff-new">'s</ins> <code title=""><ins class="diff-new">target</ins></code> <ins class="diff-new">DOM attribute, followed by a single U+0020 SPACE character, followed by the value of</ins> <var title= ""><ins class="diff-new">current node</ins></var> <ins class= "diff-new">'s</ins> <code title=""><ins class= "diff-new">data</ins></code> <ins class="diff-new">DOM attribute, followed by a single U+003E GREATER-THAN SIGN character ('> ').</ins> </dd> <dt><ins class="diff-new">If</ins> <var title=""><ins class= "diff-new">current node</ins></var> is a <code title= "">DocumentType</code></dt> <dd> Append the literal string <code><!DOCTYPE</code> (U+003C LESS-THAN SIGN, U+0021 EXCLAMATION MARK, U+0044 LATIN CAPITAL LETTER D, U+004F LATIN CAPITAL LETTER O, U+0043 LATIN CAPITAL LETTER C, U+0054 LATIN CAPITAL LETTER T, U+0059 LATIN CAPITAL LETTER Y, U+0050 LATIN CAPITAL LETTER P, U+0045 LATIN CAPITAL LETTER E), followed by a space (U+0020 SPACE), followed by the value of <del class="diff-old">the</del> <var title=""><del class= "diff-old">child</del> <ins class="diff-chg">current node</ins></var> <del class="diff-old">node's</del> <ins class= "diff-chg">'s</ins> <code title="">name</code> DOM attribute, followed by the literal string <code>></code> (U+003E GREATER-THAN SIGN). </dd> </dl> Other <del class="diff-old">nodes</del> <ins class= "diff-chg">node</ins> types (e.g. <code title="">Attr</code> ) cannot occur as children of elements. <del class= "diff-old">If</del> <ins class="diff-chg">If, despite this,</ins> they <del class="diff-old">do,</del> <ins class="diff-chg">somehow do occur,</ins> this algorithm must raise an <code>INVALID_STATE_ERR</code> exception. </li> </ol> </li> <li> The result of the algorithm is the string <var title="">s</var> . </li> </ol> <dfn id="escapingString">Escaping a string</dfn> (for the purposes of the algorithm above) consists of replacing any <del class="diff-old">occurances</del> <ins class= "diff-chg">occurrences</ins> of the " <code title="">&</code> " character by the string " <code title="">&amp;</code> ", any <del class="diff-old">occurances</del> <ins class= "diff-chg">occurrences</ins> of the " <code title=""><</code> " character by the string " <code title="">&lt;</code> ", any <del class="diff-old">occurances</del> <ins class= "diff-chg">occurrences</ins> of the " <code title="">></code> " character by the string " <code title="">&gt;</code> ", <del class="diff-old">and</del> any <del class= "diff-old">occurances</del> <ins class="diff-chg">occurrences of the U+00A0 NO-BREAK SPACE character by the string "</ins> <code title=""><ins class="diff-chg">&nbsp;</ins></code> <ins class="diff-chg">", and, if the algorithm was invoked in the</ins> <ins class="diff-chg">attribute mode</ins> ,<ins class="diff-chg">any occurrences</ins> of the " <code title= "">"</code> " character by the string " <code title= "">&quot;</code> ". Entity reference nodes are <a href= "#entity-references">assumed to be expanded</a> by the user agent, and are therefore not covered in the algorithm above. It is possible that the output of this algorithm, if parsed with an <a href="#html-0">HTML parser</a> , will not return the original tree structure. For instance, if a <code>textarea</code> element to which a <code title= "">Comment</code> node has been appended is <del class= "diff-old">serialised</del> <ins class="diff-chg">serialized</ins> and the output is then reparsed, the comment will end up being displayed in the text field. Similarly, if, as a result of DOM manipulation, an element contains a comment that contains the literal string " <code title="">--></code> ", then when the result of <del class="diff-old">serialising</del> <ins class= "diff-chg">serializing</ins> the element is parsed, the comment will be truncated at that point and the rest of the comment will be interpreted as markup. More examples would be making a <code><a href="#script1">script</a></code> element contain a text node with the text string " <code></script></code> ", or having a <code><a href="#p">p</a></code> element that contains a <code><a href="#ul">ul</a></code> element (as the <code><a href= "#ul">ul</a></code> element's start tag would imply the end tag for the <code><a href= "#p">p</a></code> ). <h3 id="parsing2"><del class= "diff-old">8.5.</del> <ins class="diff-chg">8.5</ins> Parsing HTML fragments</h3> The following steps form the <dfn id="html-fragment0">HTML fragment parsing algorithm</dfn> . The algorithm takes as input a DOM <code>Element</code> , referred to as <ins class= "diff-new">the</ins> <var title="">context <del class= "diff-old">,</del></var> <ins class="diff-chg">element,</ins> which gives the context for the parser, as well as <var title= "">input</var> , a string to parse, and returns a list of zero or more nodes. Parts marked <dfn id="fragment">fragment case</dfn> in algorithms in the parser section are parts that only occur if the parser was created for the purposes of this algorithm. The algorithms have been annotated with such markings for informational purposes only; such markings have no normative weight. If it is possible for a condition described as a <a href= "#fragment">fragment case</a> to occur even when the parser wasn't created for the purposes of handling this algorithm, then that is an error in the specification. <ol> <li> Create a new <code>Document</code> node, and mark it as being an <a href="#html-" title="HTML documents">HTML document</a> . </li> <li> Create a new <a href="#html-0">HTML parser</a> , and associate it with the just created <code>Document</code> node. </li> <li> Set the <a href="#html-0">HTML parser</a> 's <a href= "#tokenisation0">tokenisation</a> stage's <a href= "#content2">content model flag</a> according to the <var title= "">context</var> element, as follows: <dl class="switch"> <dt>If it is a <code><a href="#title1">title</a></code> or <code>textarea</code> element</dt> <dd>Set the <a href="#content2">content model flag</a> to RCDATA .</dd> <dt>If it is a <code><a href="#style1">style</a></code> , <code><a href="#script1">script</a></code> , <code>xmp</code> , <code><a href="#iframe">iframe</a></code> , <code>noembed</code> , or <code>noframes</code> element</dt> <dd>Set the <a href="#content2">content model flag</a> to CDATA .</dd> <dt>If it is a <code><a href="#noscript">noscript</a></code> element</dt> <dd>If <ins class="diff-new">the</ins> <a href= "#scripting2">scripting <ins class="diff-new">flag</ins></a> is <del class="diff-old">enabled ,</del> <ins class= "diff-chg">enabled,</ins> set the <a href="#content2">content model flag</a> to CDATA . Otherwise, set the <a href= "#content2">content model flag</a> to PCDATA .</dd> <dt>If it is a <code>plaintext</code> element</dt> <dd>Set the <a href="#content2">content model flag</a> to PLAINTEXT .</dd> <dt>Otherwise</dt> <dd>Set the <a href="#content2">content model flag</a> to PCDATA .</dd> </dl> </li> <li> <del class="diff-old">Switch the HTML parser 's tree construction stage to the main phase .</del> Let <var title= "">root</var> be a new <code><a href="#html">html</a></code> element with no attributes. </li> <li> Append the element <var title="">root</var> to the <code>Document</code> node created above. </li> <li> Set up the parser's <a href="#stack">stack of open elements</a> so that it contains just the single element <var title= "">root</var> . </li> <li> <a href="#reset" title= "reset the insertion mode appropriately">Reset the parser's insertion mode appropriately</a> . The parser will reference the <var title= "">context</var> <del class="diff-old">node</del> <ins class= "diff-chg">element</ins> as part of that algorithm. </li> <li> Set the parser's <a href="#form-element"><code>form</code> element pointer</a> to the nearest node to the <var title= "">context</var> <ins class="diff-new">element</ins> that is a <code>form</code> element (going straight up the ancestor chain, and including the element itself, if it is a <code>form</code> element), or, if there is no such <code>form</code> element, to null. </li> <li> Place into the <a href="#input0">input stream</a> for the <a href="#html-0">HTML parser</a> just created the <var title= "">input</var> . </li> <li> Start the parser and let it run until it has consumed all the characters just inserted into the input stream. </li> <li> Return all the child nodes of <var title="">root</var> , preserving the document order. </li> </ol> <h3 id="named"><del class="diff-old">8.6.</del> <ins class="diff-chg">8.6</ins> <del class= "diff-old">Entities</del> <dfn id="named0"><ins class= "diff-chg">Named character references</ins></dfn></h3> This table lists the <del class="diff-old">entity</del> <ins class="diff-chg">character reference</ins> names that are supported by HTML, and the code points to which they refer. It is referenced by the previous sections. <div class="tall-and-narrow"> <table> <thead> <tr> <th><del class="diff-old">Entity</del> Name</th> <th>Character</th> </tr> </thead> <tbody> <tr> <td><code title="">AElig;</code></td> <td><del class="diff-old">U+00C6</del> <ins class= "diff-chg">U+000C6</ins></td> </tr> <tr> <td><code title="">AElig</code></td> <td><del class="diff-old">U+00C6</del> <ins class= "diff-chg">U+000C6</ins></td> </tr> <tr> <td><code title="">AMP;</code></td> <td><del class="diff-old">U+0026</del> <ins class= "diff-chg">U+00026</ins></td> </tr> <tr> <td><code title="">AMP</code></td> <td><del class="diff-old">U+0026</del> <ins class= "diff-chg">U+00026</ins></td> </tr> <tr> <td><code title="">Aacute;</code></td> <td><del class="diff-old">U+00C1</del> <ins class= "diff-chg">U+000C1</ins></td> </tr> <tr> <td><code title="">Aacute</code></td> <td><del class="diff-old">U+00C1</del> <ins class= "diff-chg">U+000C1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Abreve;</ins></code></td> <td><ins class="diff-chg">U+00102</ins></td> </tr> <tr> <td><code title="">Acirc;</code></td> <td><del class="diff-old">U+00C2</del> <ins class= "diff-chg">U+000C2</ins></td> </tr> <tr> <td><code title="">Acirc</code></td> <td><del class="diff-old">U+00C2</del> <ins class= "diff-chg">U+000C2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Acy;</ins></code></td> <td><ins class="diff-chg">U+00410</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Afr;</ins></code></td> <td><ins class="diff-chg">U+1D504</ins></td> </tr> <tr> <td><code title="">Agrave;</code></td> <td><del class="diff-old">U+00C0</del> <ins class= "diff-chg">U+000C0</ins></td> </tr> <tr> <td><code title="">Agrave</code></td> <td><del class="diff-old">U+00C0</del> <ins class= "diff-chg">U+000C0</ins></td> </tr> <tr> <td><code title="">Alpha;</code></td> <td><del class="diff-old">U+0391</del> <ins class= "diff-chg">U+00391</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Amacr;</ins></code></td> <td><ins class="diff-chg">U+00100</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">And;</ins></code></td> <td><ins class="diff-chg">U+02A53</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Aogon;</ins></code></td> <td><ins class="diff-chg">U+00104</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Aopf;</ins></code></td> <td><ins class="diff-chg">U+1D538</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ApplyFunction;</ins></code></td> <td><ins class="diff-chg">U+02061</ins></td> </tr> <tr> <td><code title="">Aring;</code></td> <td><del class="diff-old">U+00C5</del> <ins class= "diff-chg">U+000C5</ins></td> </tr> <tr> <td><code title="">Aring</code></td> <td><del class="diff-old">U+00C5</del> <ins class= "diff-chg">U+000C5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ascr;</ins></code></td> <td><ins class="diff-chg">U+1D49C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Assign;</ins></code></td> <td><ins class="diff-chg">U+02254</ins></td> </tr> <tr> <td><code title="">Atilde;</code></td> <td><del class="diff-old">U+00C3</del> <ins class= "diff-chg">U+000C3</ins></td> </tr> <tr> <td><code title="">Atilde</code></td> <td><del class="diff-old">U+00C3</del> <ins class= "diff-chg">U+000C3</ins></td> </tr> <tr> <td><code title="">Auml;</code></td> <td><del class="diff-old">U+00C4</del> <ins class= "diff-chg">U+000C4</ins></td> </tr> <tr> <td><code title="">Auml</code></td> <td><del class="diff-old">U+00C4</del> <ins class= "diff-chg">U+000C4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Backslash;</ins></code></td> <td><ins class="diff-chg">U+02216</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Barv;</ins></code></td> <td><ins class="diff-chg">U+02AE7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Barwed;</ins></code></td> <td><ins class="diff-chg">U+02306</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Bcy;</ins></code></td> <td><ins class="diff-chg">U+00411</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Because;</ins></code></td> <td><ins class="diff-chg">U+02235</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Bernoullis;</ins></code></td> <td><ins class="diff-chg">U+0212C</ins></td> </tr> <tr> <td><code title="">Beta;</code></td> <td><del class="diff-old">U+0392</del> <ins class= "diff-chg">U+00392</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Bfr;</ins></code></td> <td><ins class="diff-chg">U+1D505</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Bopf;</ins></code></td> <td><ins class="diff-chg">U+1D539</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Breve;</ins></code></td> <td><ins class="diff-chg">U+002D8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Bscr;</ins></code></td> <td><ins class="diff-chg">U+0212C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Bumpeq;</ins></code></td> <td><ins class="diff-chg">U+0224E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">CHcy;</ins></code></td> <td><ins class="diff-chg">U+00427</ins></td> </tr> <tr> <td><code title="">COPY;</code></td> <td><del class="diff-old">U+00A9</del> <ins class= "diff-chg">U+000A9</ins></td> </tr> <tr> <td><code title="">COPY</code></td> <td><del class="diff-old">U+00A9</del> <ins class= "diff-chg">U+000A9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Cacute;</ins></code></td> <td><ins class="diff-chg">U+00106</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Cap;</ins></code></td> <td><ins class="diff-chg">U+022D2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">CapitalDifferentialD;</ins></code></td> <td><ins class="diff-chg">U+02145</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Cayleys;</ins></code></td> <td><ins class="diff-chg">U+0212D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ccaron;</ins></code></td> <td><ins class="diff-chg">U+0010C</ins></td> </tr> <tr> <td><code title="">Ccedil;</code></td> <td><del class="diff-old">U+00C7</del> <ins class= "diff-chg">U+000C7</ins></td> </tr> <tr> <td><code title="">Ccedil</code></td> <td><del class="diff-old">U+00C7</del> <ins class= "diff-chg">U+000C7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ccirc;</ins></code></td> <td><ins class="diff-chg">U+00108</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Cconint;</ins></code></td> <td><ins class="diff-chg">U+02230</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Cdot;</ins></code></td> <td><ins class="diff-chg">U+0010A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Cedilla;</ins></code></td> <td><ins class="diff-chg">U+000B8</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">CenterDot;</ins></code></td> <td><ins class="diff-chg">U+000B7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Cfr;</ins></code></td> <td><ins class="diff-chg">U+0212D</ins></td> </tr> <tr> <td><code title="">Chi;</code></td> <td><del class="diff-old">U+03A7</del> <ins class= "diff-chg">U+003A7</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">CircleDot;</ins></code></td> <td><ins class="diff-chg">U+02299</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">CircleMinus;</ins></code></td> <td><ins class="diff-chg">U+02296</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">CirclePlus;</ins></code></td> <td><ins class="diff-chg">U+02295</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">CircleTimes;</ins></code></td> <td><ins class="diff-chg">U+02297</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ClockwiseContourIntegral;</ins></code></td> <td><ins class="diff-chg">U+02232</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">CloseCurlyDoubleQuote;</ins></code></td> <td><ins class="diff-chg">U+0201D</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">CloseCurlyQuote;</ins></code></td> <td><ins class="diff-chg">U+02019</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Colon;</ins></code></td> <td><ins class="diff-chg">U+02237</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Colone;</ins></code></td> <td><ins class="diff-chg">U+02A74</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Congruent;</ins></code></td> <td><ins class="diff-chg">U+02261</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Conint;</ins></code></td> <td><ins class="diff-chg">U+0222F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ContourIntegral;</ins></code></td> <td><ins class="diff-chg">U+0222E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Copf;</ins></code></td> <td><ins class="diff-chg">U+02102</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Coproduct;</ins></code></td> <td><ins class="diff-chg">U+02210</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">CounterClockwiseContourIntegral;</ins></code></td> <td><ins class="diff-chg">U+02233</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Cross;</ins></code></td> <td><ins class="diff-chg">U+02A2F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Cscr;</ins></code></td> <td><ins class="diff-chg">U+1D49E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Cup;</ins></code></td> <td><ins class="diff-chg">U+022D3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">CupCap;</ins></code></td> <td><ins class="diff-chg">U+0224D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">DD;</ins></code></td> <td><ins class="diff-chg">U+02145</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DDotrahd;</ins></code></td> <td><ins class="diff-chg">U+02911</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">DJcy;</ins></code></td> <td><ins class="diff-chg">U+00402</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">DScy;</ins></code></td> <td><ins class="diff-chg">U+00405</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">DZcy;</ins></code></td> <td><ins class="diff-chg">U+0040F</ins></td> </tr> <tr> <td><code title="">Dagger;</code></td> <td><del class="diff-old">U+2021</del> <ins class= "diff-chg">U+02021</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Darr;</ins></code></td> <td><ins class="diff-chg">U+021A1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Dashv;</ins></code></td> <td><ins class="diff-chg">U+02AE4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Dcaron;</ins></code></td> <td><ins class="diff-chg">U+0010E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Dcy;</ins></code></td> <td><ins class="diff-chg">U+00414</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Del;</ins></code></td> <td><ins class="diff-chg">U+02207</ins></td> </tr> <tr> <td><code title="">Delta;</code></td> <td><del class="diff-old">U+0394</del> <ins class= "diff-chg">U+00394</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Dfr;</ins></code></td> <td><ins class="diff-chg">U+1D507</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DiacriticalAcute;</ins></code></td> <td><ins class="diff-chg">U+000B4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DiacriticalDot;</ins></code></td> <td><ins class="diff-chg">U+002D9</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DiacriticalDoubleAcute;</ins></code></td> <td><ins class="diff-chg">U+002DD</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DiacriticalGrave;</ins></code></td> <td><ins class="diff-chg">U+00060</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DiacriticalTilde;</ins></code></td> <td><ins class="diff-chg">U+002DC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Diamond;</ins></code></td> <td><ins class="diff-chg">U+022C4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DifferentialD;</ins></code></td> <td><ins class="diff-chg">U+02146</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Dopf;</ins></code></td> <td><ins class="diff-chg">U+1D53B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Dot;</ins></code></td> <td><ins class="diff-chg">U+000A8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">DotDot;</ins></code></td> <td><ins class="diff-chg">U+020DC</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DotEqual;</ins></code></td> <td><ins class="diff-chg">U+02250</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleContourIntegral;</ins></code></td> <td><ins class="diff-chg">U+0222F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleDot;</ins></code></td> <td><ins class="diff-chg">U+000A8</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleDownArrow;</ins></code></td> <td><ins class="diff-chg">U+021D3</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleLeftArrow;</ins></code></td> <td><ins class="diff-chg">U+021D0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleLeftRightArrow;</ins></code></td> <td><ins class="diff-chg">U+021D4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleLeftTee;</ins></code></td> <td><ins class="diff-chg">U+02AE4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleLongLeftArrow;</ins></code></td> <td><ins class="diff-chg">U+027F8</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleLongLeftRightArrow;</ins></code></td> <td><ins class="diff-chg">U+027FA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleLongRightArrow;</ins></code></td> <td><ins class="diff-chg">U+027F9</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleRightArrow;</ins></code></td> <td><ins class="diff-chg">U+021D2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleRightTee;</ins></code></td> <td><ins class="diff-chg">U+022A8</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleUpArrow;</ins></code></td> <td><ins class="diff-chg">U+021D1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleUpDownArrow;</ins></code></td> <td><ins class="diff-chg">U+021D5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DoubleVerticalBar;</ins></code></td> <td><ins class="diff-chg">U+02225</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DownArrow;</ins></code></td> <td><ins class="diff-chg">U+02193</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DownArrowBar;</ins></code></td> <td><ins class="diff-chg">U+02913</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DownArrowUpArrow;</ins></code></td> <td><ins class="diff-chg">U+021F5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DownBreve;</ins></code></td> <td><ins class="diff-chg">U+00311</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DownLeftRightVector;</ins></code></td> <td><ins class="diff-chg">U+02950</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DownLeftTeeVector;</ins></code></td> <td><ins class="diff-chg">U+0295E</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DownLeftVector;</ins></code></td> <td><ins class="diff-chg">U+021BD</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DownLeftVectorBar;</ins></code></td> <td><ins class="diff-chg">U+02956</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DownRightTeeVector;</ins></code></td> <td><ins class="diff-chg">U+0295F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DownRightVector;</ins></code></td> <td><ins class="diff-chg">U+021C1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DownRightVectorBar;</ins></code></td> <td><ins class="diff-chg">U+02957</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">DownTee;</ins></code></td> <td><ins class="diff-chg">U+022A4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">DownTeeArrow;</ins></code></td> <td><ins class="diff-chg">U+021A7</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Downarrow;</ins></code></td> <td><ins class="diff-chg">U+021D3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Dscr;</ins></code></td> <td><ins class="diff-chg">U+1D49F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Dstrok;</ins></code></td> <td><ins class="diff-chg">U+00110</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ENG;</ins></code></td> <td><ins class="diff-chg">U+0014A</ins></td> </tr> <tr> <td><code title="">ETH;</code></td> <td><del class="diff-old">U+00D0</del> <ins class= "diff-chg">U+000D0</ins></td> </tr> <tr> <td><code title="">ETH</code></td> <td><del class="diff-old">U+00D0</del> <ins class= "diff-chg">U+000D0</ins></td> </tr> <tr> <td><code title="">Eacute;</code></td> <td><del class="diff-old">U+00C9</del> <ins class= "diff-chg">U+000C9</ins></td> </tr> <tr> <td><code title="">Eacute</code></td> <td><del class="diff-old">U+00C9</del> <ins class= "diff-chg">U+000C9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ecaron;</ins></code></td> <td><ins class="diff-chg">U+0011A</ins></td> </tr> <tr> <td><code title="">Ecirc;</code></td> <td><del class="diff-old">U+00CA</del> <ins class= "diff-chg">U+000CA</ins></td> </tr> <tr> <td><code title="">Ecirc</code></td> <td><del class="diff-old">U+00CA</del> <ins class= "diff-chg">U+000CA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ecy;</ins></code></td> <td><ins class="diff-chg">U+0042D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Edot;</ins></code></td> <td><ins class="diff-chg">U+00116</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Efr;</ins></code></td> <td><ins class="diff-chg">U+1D508</ins></td> </tr> <tr> <td><code title="">Egrave;</code></td> <td><del class="diff-old">U+00C8</del> <ins class= "diff-chg">U+000C8</ins></td> </tr> <tr> <td><code title="">Egrave</code></td> <td><del class="diff-old">U+00C8</del> <ins class= "diff-chg">U+000C8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Element;</ins></code></td> <td><ins class="diff-chg">U+02208</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Emacr;</ins></code></td> <td><ins class="diff-chg">U+00112</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">EmptySmallSquare;</ins></code></td> <td><ins class="diff-chg">U+025FB</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">EmptyVerySmallSquare;</ins></code></td> <td><ins class="diff-chg">U+025AB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Eogon;</ins></code></td> <td><ins class="diff-chg">U+00118</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Eopf;</ins></code></td> <td><ins class="diff-chg">U+1D53C</ins></td> </tr> <tr> <td><code title="">Epsilon;</code></td> <td><del class="diff-old">U+0395</del> <ins class= "diff-chg">U+00395</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Equal;</ins></code></td> <td><ins class="diff-chg">U+02A75</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">EqualTilde;</ins></code></td> <td><ins class="diff-chg">U+02242</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Equilibrium;</ins></code></td> <td><ins class="diff-chg">U+021CC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Escr;</ins></code></td> <td><ins class="diff-chg">U+02130</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Esim;</ins></code></td> <td><ins class="diff-chg">U+02A73</ins></td> </tr> <tr> <td><code title="">Eta;</code></td> <td><del class="diff-old">U+0397</del> <ins class= "diff-chg">U+00397</ins></td> </tr> <tr> <td><code title="">Euml;</code></td> <td><del class="diff-old">U+00CB</del> <ins class= "diff-chg">U+000CB</ins></td> </tr> <tr> <td><code title="">Euml</code></td> <td><del class="diff-old">U+00CB</del> <ins class= "diff-chg">U+000CB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Exists;</ins></code></td> <td><ins class="diff-chg">U+02203</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ExponentialE;</ins></code></td> <td><ins class="diff-chg">U+02147</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Fcy;</ins></code></td> <td><ins class="diff-chg">U+00424</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ffr;</ins></code></td> <td><ins class="diff-chg">U+1D509</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">FilledSmallSquare;</ins></code></td> <td><ins class="diff-chg">U+025FC</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">FilledVerySmallSquare;</ins></code></td> <td><ins class="diff-chg">U+025AA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Fopf;</ins></code></td> <td><ins class="diff-chg">U+1D53D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ForAll;</ins></code></td> <td><ins class="diff-chg">U+02200</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Fouriertrf;</ins></code></td> <td><ins class="diff-chg">U+02131</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Fscr;</ins></code></td> <td><ins class="diff-chg">U+02131</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">GJcy;</ins></code></td> <td><ins class="diff-chg">U+00403</ins></td> </tr> <tr> <td><code title="">GT;</code></td> <td><del class="diff-old">U+003E</del> <ins class= "diff-chg">U+0003E</ins></td> </tr> <tr> <td><code title="">GT</code></td> <td><del class="diff-old">U+003E</del> <ins class= "diff-chg">U+0003E</ins></td> </tr> <tr> <td><code title="">Gamma;</code></td> <td><del class="diff-old">U+0393</del> <ins class= "diff-chg">U+00393</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Gammad;</ins></code></td> <td><ins class="diff-chg">U+003DC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Gbreve;</ins></code></td> <td><ins class="diff-chg">U+0011E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Gcedil;</ins></code></td> <td><ins class="diff-chg">U+00122</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Gcirc;</ins></code></td> <td><ins class="diff-chg">U+0011C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Gcy;</ins></code></td> <td><ins class="diff-chg">U+00413</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Gdot;</ins></code></td> <td><ins class="diff-chg">U+00120</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Gfr;</ins></code></td> <td><ins class="diff-chg">U+1D50A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Gg;</ins></code></td> <td><ins class="diff-chg">U+022D9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Gopf;</ins></code></td> <td><ins class="diff-chg">U+1D53E</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">GreaterEqual;</ins></code></td> <td><ins class="diff-chg">U+02265</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">GreaterEqualLess;</ins></code></td> <td><ins class="diff-chg">U+022DB</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">GreaterFullEqual;</ins></code></td> <td><ins class="diff-chg">U+02267</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">GreaterGreater;</ins></code></td> <td><ins class="diff-chg">U+02AA2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">GreaterLess;</ins></code></td> <td><ins class="diff-chg">U+02277</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">GreaterSlantEqual;</ins></code></td> <td><ins class="diff-chg">U+02A7E</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">GreaterTilde;</ins></code></td> <td><ins class="diff-chg">U+02273</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Gscr;</ins></code></td> <td><ins class="diff-chg">U+1D4A2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Gt;</ins></code></td> <td><ins class="diff-chg">U+0226B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">HARDcy;</ins></code></td> <td><ins class="diff-chg">U+0042A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Hacek;</ins></code></td> <td><ins class="diff-chg">U+002C7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Hat;</ins></code></td> <td><ins class="diff-chg">U+0005E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Hcirc;</ins></code></td> <td><ins class="diff-chg">U+00124</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Hfr;</ins></code></td> <td><ins class="diff-chg">U+0210C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">HilbertSpace;</ins></code></td> <td><ins class="diff-chg">U+0210B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Hopf;</ins></code></td> <td><ins class="diff-chg">U+0210D</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">HorizontalLine;</ins></code></td> <td><ins class="diff-chg">U+02500</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Hscr;</ins></code></td> <td><ins class="diff-chg">U+0210B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Hstrok;</ins></code></td> <td><ins class="diff-chg">U+00126</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">HumpDownHump;</ins></code></td> <td><ins class="diff-chg">U+0224E</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">HumpEqual;</ins></code></td> <td><ins class="diff-chg">U+0224F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">IEcy;</ins></code></td> <td><ins class="diff-chg">U+00415</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">IJlig;</ins></code></td> <td><ins class="diff-chg">U+00132</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">IOcy;</ins></code></td> <td><ins class="diff-chg">U+00401</ins></td> </tr> <tr> <td><code title="">Iacute;</code></td> <td><del class="diff-old">U+00CD</del> <ins class= "diff-chg">U+000CD</ins></td> </tr> <tr> <td><code title="">Iacute</code></td> <td><del class="diff-old">U+00CD</del> <ins class= "diff-chg">U+000CD</ins></td> </tr> <tr> <td><code title="">Icirc;</code></td> <td><del class="diff-old">U+00CE</del> <ins class= "diff-chg">U+000CE</ins></td> </tr> <tr> <td><code title="">Icirc</code></td> <td><del class="diff-old">U+00CE</del> <ins class= "diff-chg">U+000CE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Icy;</ins></code></td> <td><ins class="diff-chg">U+00418</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Idot;</ins></code></td> <td><ins class="diff-chg">U+00130</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ifr;</ins></code></td> <td><ins class="diff-chg">U+02111</ins></td> </tr> <tr> <td><code title="">Igrave;</code></td> <td><del class="diff-old">U+00CC</del> <ins class= "diff-chg">U+000CC</ins></td> </tr> <tr> <td><code title="">Igrave</code></td> <td><del class="diff-old">U+00CC</del> <ins class= "diff-chg">U+000CC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Im;</ins></code></td> <td><ins class="diff-chg">U+02111</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Imacr;</ins></code></td> <td><ins class="diff-chg">U+0012A</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ImaginaryI;</ins></code></td> <td><ins class="diff-chg">U+02148</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Implies;</ins></code></td> <td><ins class="diff-chg">U+021D2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Int;</ins></code></td> <td><ins class="diff-chg">U+0222C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Integral;</ins></code></td> <td><ins class="diff-chg">U+0222B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Intersection;</ins></code></td> <td><ins class="diff-chg">U+022C2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">InvisibleComma;</ins></code></td> <td><ins class="diff-chg">U+02063</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">InvisibleTimes;</ins></code></td> <td><ins class="diff-chg">U+02062</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Iogon;</ins></code></td> <td><ins class="diff-chg">U+0012E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Iopf;</ins></code></td> <td><ins class="diff-chg">U+1D540</ins></td> </tr> <tr> <td><code title="">Iota;</code></td> <td><del class="diff-old">U+0399</del> <ins class= "diff-chg">U+00399</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Iscr;</ins></code></td> <td><ins class="diff-chg">U+02110</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Itilde;</ins></code></td> <td><ins class="diff-chg">U+00128</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Iukcy;</ins></code></td> <td><ins class="diff-chg">U+00406</ins></td> </tr> <tr> <td><code title="">Iuml;</code></td> <td><del class="diff-old">U+00CF</del> <ins class= "diff-chg">U+000CF</ins></td> </tr> <tr> <td><code title="">Iuml</code></td> <td><del class="diff-old">U+00CF</del> <ins class= "diff-chg">U+000CF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Jcirc;</ins></code></td> <td><ins class="diff-chg">U+00134</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Jcy;</ins></code></td> <td><ins class="diff-chg">U+00419</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Jfr;</ins></code></td> <td><ins class="diff-chg">U+1D50D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Jopf;</ins></code></td> <td><ins class="diff-chg">U+1D541</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Jscr;</ins></code></td> <td><ins class="diff-chg">U+1D4A5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Jsercy;</ins></code></td> <td><ins class="diff-chg">U+00408</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Jukcy;</ins></code></td> <td><ins class="diff-chg">U+00404</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">KHcy;</ins></code></td> <td><ins class="diff-chg">U+00425</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">KJcy;</ins></code></td> <td><ins class="diff-chg">U+0040C</ins></td> </tr> <tr> <td><code title="">Kappa;</code></td> <td><del class="diff-old">U+039A</del> <ins class= "diff-chg">U+0039A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Kcedil;</ins></code></td> <td><ins class="diff-chg">U+00136</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Kcy;</ins></code></td> <td><ins class="diff-chg">U+0041A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Kfr;</ins></code></td> <td><ins class="diff-chg">U+1D50E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Kopf;</ins></code></td> <td><ins class="diff-chg">U+1D542</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Kscr;</ins></code></td> <td><ins class="diff-chg">U+1D4A6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">LJcy;</ins></code></td> <td><ins class="diff-chg">U+00409</ins></td> </tr> <tr> <td><code title="">LT;</code></td> <td><del class="diff-old">U+003C</del> <ins class= "diff-chg">U+0003C</ins></td> </tr> <tr> <td><code title="">LT</code></td> <td><del class="diff-old">U+003C</del> <ins class= "diff-chg">U+0003C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Lacute;</ins></code></td> <td><ins class="diff-chg">U+00139</ins></td> </tr> <tr> <td><code title="">Lambda;</code></td> <td><del class="diff-old">U+039B</del> <ins class= "diff-chg">U+0039B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Lang;</ins></code></td> <td><ins class="diff-chg">U+027EA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Laplacetrf;</ins></code></td> <td><ins class="diff-chg">U+02112</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Larr;</ins></code></td> <td><ins class="diff-chg">U+0219E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Lcaron;</ins></code></td> <td><ins class="diff-chg">U+0013D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Lcedil;</ins></code></td> <td><ins class="diff-chg">U+0013B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Lcy;</ins></code></td> <td><ins class="diff-chg">U+0041B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftAngleBracket;</ins></code></td> <td><ins class="diff-chg">U+027E8</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftArrow;</ins></code></td> <td><ins class="diff-chg">U+02190</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftArrowBar;</ins></code></td> <td><ins class="diff-chg">U+021E4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftArrowRightArrow;</ins></code></td> <td><ins class="diff-chg">U+021C6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftCeiling;</ins></code></td> <td><ins class="diff-chg">U+02308</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftDoubleBracket;</ins></code></td> <td><ins class="diff-chg">U+027E6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftDownTeeVector;</ins></code></td> <td><ins class="diff-chg">U+02961</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftDownVector;</ins></code></td> <td><ins class="diff-chg">U+021C3</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftDownVectorBar;</ins></code></td> <td><ins class="diff-chg">U+02959</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftFloor;</ins></code></td> <td><ins class="diff-chg">U+0230A</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftRightArrow;</ins></code></td> <td><ins class="diff-chg">U+02194</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftRightVector;</ins></code></td> <td><ins class="diff-chg">U+0294E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">LeftTee;</ins></code></td> <td><ins class="diff-chg">U+022A3</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftTeeArrow;</ins></code></td> <td><ins class="diff-chg">U+021A4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftTeeVector;</ins></code></td> <td><ins class="diff-chg">U+0295A</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftTriangle;</ins></code></td> <td><ins class="diff-chg">U+022B2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftTriangleBar;</ins></code></td> <td><ins class="diff-chg">U+029CF</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftTriangleEqual;</ins></code></td> <td><ins class="diff-chg">U+022B4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftUpDownVector;</ins></code></td> <td><ins class="diff-chg">U+02951</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftUpTeeVector;</ins></code></td> <td><ins class="diff-chg">U+02960</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftUpVector;</ins></code></td> <td><ins class="diff-chg">U+021BF</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftUpVectorBar;</ins></code></td> <td><ins class="diff-chg">U+02958</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftVector;</ins></code></td> <td><ins class="diff-chg">U+021BC</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LeftVectorBar;</ins></code></td> <td><ins class="diff-chg">U+02952</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Leftarrow;</ins></code></td> <td><ins class="diff-chg">U+021D0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Leftrightarrow;</ins></code></td> <td><ins class="diff-chg">U+021D4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LessEqualGreater;</ins></code></td> <td><ins class="diff-chg">U+022DA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LessFullEqual;</ins></code></td> <td><ins class="diff-chg">U+02266</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LessGreater;</ins></code></td> <td><ins class="diff-chg">U+02276</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LessLess;</ins></code></td> <td><ins class="diff-chg">U+02AA1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LessSlantEqual;</ins></code></td> <td><ins class="diff-chg">U+02A7D</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LessTilde;</ins></code></td> <td><ins class="diff-chg">U+02272</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Lfr;</ins></code></td> <td><ins class="diff-chg">U+1D50F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ll;</ins></code></td> <td><ins class="diff-chg">U+022D8</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Lleftarrow;</ins></code></td> <td><ins class="diff-chg">U+021DA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Lmidot;</ins></code></td> <td><ins class="diff-chg">U+0013F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LongLeftArrow;</ins></code></td> <td><ins class="diff-chg">U+027F5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LongLeftRightArrow;</ins></code></td> <td><ins class="diff-chg">U+027F7</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LongRightArrow;</ins></code></td> <td><ins class="diff-chg">U+027F6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Longleftarrow;</ins></code></td> <td><ins class="diff-chg">U+027F8</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Longleftrightarrow;</ins></code></td> <td><ins class="diff-chg">U+027FA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Longrightarrow;</ins></code></td> <td><ins class="diff-chg">U+027F9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Lopf;</ins></code></td> <td><ins class="diff-chg">U+1D543</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LowerLeftArrow;</ins></code></td> <td><ins class="diff-chg">U+02199</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">LowerRightArrow;</ins></code></td> <td><ins class="diff-chg">U+02198</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Lscr;</ins></code></td> <td><ins class="diff-chg">U+02112</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Lsh;</ins></code></td> <td><ins class="diff-chg">U+021B0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Lstrok;</ins></code></td> <td><ins class="diff-chg">U+00141</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Lt;</ins></code></td> <td><ins class="diff-chg">U+0226A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Map;</ins></code></td> <td><ins class="diff-chg">U+02905</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Mcy;</ins></code></td> <td><ins class="diff-chg">U+0041C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">MediumSpace;</ins></code></td> <td><ins class="diff-chg">U+0205F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Mellintrf;</ins></code></td> <td><ins class="diff-chg">U+02133</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Mfr;</ins></code></td> <td><ins class="diff-chg">U+1D510</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">MinusPlus;</ins></code></td> <td><ins class="diff-chg">U+02213</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Mopf;</ins></code></td> <td><ins class="diff-chg">U+1D544</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Mscr;</ins></code></td> <td><ins class="diff-chg">U+02133</ins></td> </tr> <tr> <td><code title="">Mu;</code></td> <td><del class="diff-old">U+039C</del> <ins class= "diff-chg">U+0039C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">NJcy;</ins></code></td> <td><ins class="diff-chg">U+0040A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Nacute;</ins></code></td> <td><ins class="diff-chg">U+00143</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ncaron;</ins></code></td> <td><ins class="diff-chg">U+00147</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ncedil;</ins></code></td> <td><ins class="diff-chg">U+00145</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ncy;</ins></code></td> <td><ins class="diff-chg">U+0041D</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NegativeMediumSpace;</ins></code></td> <td><ins class="diff-chg">U+0200B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NegativeThickSpace;</ins></code></td> <td><ins class="diff-chg">U+0200B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NegativeThinSpace;</ins></code></td> <td><ins class="diff-chg">U+0200B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NegativeVeryThinSpace;</ins></code></td> <td><ins class="diff-chg">U+0200B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NestedGreaterGreater;</ins></code></td> <td><ins class="diff-chg">U+0226B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NestedLessLess;</ins></code></td> <td><ins class="diff-chg">U+0226A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">NewLine;</ins></code></td> <td><ins class="diff-chg">U+0000A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Nfr;</ins></code></td> <td><ins class="diff-chg">U+1D511</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">NoBreak;</ins></code></td> <td><ins class="diff-chg">U+02060</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NonBreakingSpace;</ins></code></td> <td><ins class="diff-chg">U+000A0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Nopf;</ins></code></td> <td><ins class="diff-chg">U+02115</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Not;</ins></code></td> <td><ins class="diff-chg">U+02AEC</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotCongruent;</ins></code></td> <td><ins class="diff-chg">U+02262</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotCupCap;</ins></code></td> <td><ins class="diff-chg">U+0226D</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotDoubleVerticalBar;</ins></code></td> <td><ins class="diff-chg">U+02226</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotElement;</ins></code></td> <td><ins class="diff-chg">U+02209</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotEqual;</ins></code></td> <td><ins class="diff-chg">U+02260</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotExists;</ins></code></td> <td><ins class="diff-chg">U+02204</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotGreater;</ins></code></td> <td><ins class="diff-chg">U+0226F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotGreaterEqual;</ins></code></td> <td><ins class="diff-chg">U+02271</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotGreaterLess;</ins></code></td> <td><ins class="diff-chg">U+02279</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotGreaterTilde;</ins></code></td> <td><ins class="diff-chg">U+02275</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotLeftTriangle;</ins></code></td> <td><ins class="diff-chg">U+022EA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotLeftTriangleEqual;</ins></code></td> <td><ins class="diff-chg">U+022EC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">NotLess;</ins></code></td> <td><ins class="diff-chg">U+0226E</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotLessEqual;</ins></code></td> <td><ins class="diff-chg">U+02270</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotLessGreater;</ins></code></td> <td><ins class="diff-chg">U+02278</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotLessTilde;</ins></code></td> <td><ins class="diff-chg">U+02274</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotPrecedes;</ins></code></td> <td><ins class="diff-chg">U+02280</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotPrecedesSlantEqual;</ins></code></td> <td><ins class="diff-chg">U+022E0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotReverseElement;</ins></code></td> <td><ins class="diff-chg">U+0220C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotRightTriangle;</ins></code></td> <td><ins class="diff-chg">U+022EB</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotRightTriangleEqual;</ins></code></td> <td><ins class="diff-chg">U+022ED</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotSquareSubsetEqual;</ins></code></td> <td><ins class="diff-chg">U+022E2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotSquareSupersetEqual;</ins></code></td> <td><ins class="diff-chg">U+022E3</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotSubsetEqual;</ins></code></td> <td><ins class="diff-chg">U+02288</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotSucceeds;</ins></code></td> <td><ins class="diff-chg">U+02281</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotSucceedsSlantEqual;</ins></code></td> <td><ins class="diff-chg">U+022E1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotSupersetEqual;</ins></code></td> <td><ins class="diff-chg">U+02289</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotTilde;</ins></code></td> <td><ins class="diff-chg">U+02241</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotTildeEqual;</ins></code></td> <td><ins class="diff-chg">U+02244</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotTildeFullEqual;</ins></code></td> <td><ins class="diff-chg">U+02247</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotTildeTilde;</ins></code></td> <td><ins class="diff-chg">U+02249</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">NotVerticalBar;</ins></code></td> <td><ins class="diff-chg">U+02224</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Nscr;</ins></code></td> <td><ins class="diff-chg">U+1D4A9</ins></td> </tr> <tr> <td><code title="">Ntilde;</code></td> <td><del class="diff-old">U+00D1</del> <ins class= "diff-chg">U+000D1</ins></td> </tr> <tr> <td><code title="">Ntilde</code></td> <td><del class="diff-old">U+00D1</del> <ins class= "diff-chg">U+000D1</ins></td> </tr> <tr> <td><code title="">Nu;</code></td> <td><del class="diff-old">U+039D</del> <ins class= "diff-chg">U+0039D</ins></td> </tr> <tr> <td><code title="">OElig;</code></td> <td><del class="diff-old">U+0152</del> <ins class= "diff-chg">U+00152</ins></td> </tr> <tr> <td><code title="">Oacute;</code></td> <td><del class="diff-old">U+00D3</del> <ins class= "diff-chg">U+000D3</ins></td> </tr> <tr> <td><code title="">Oacute</code></td> <td><del class="diff-old">U+00D3</del> <ins class= "diff-chg">U+000D3</ins></td> </tr> <tr> <td><code title="">Ocirc;</code></td> <td><del class="diff-old">U+00D4</del> <ins class= "diff-chg">U+000D4</ins></td> </tr> <tr> <td><code title="">Ocirc</code></td> <td><del class="diff-old">U+00D4</del> <ins class= "diff-chg">U+000D4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ocy;</ins></code></td> <td><ins class="diff-chg">U+0041E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Odblac;</ins></code></td> <td><ins class="diff-chg">U+00150</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ofr;</ins></code></td> <td><ins class="diff-chg">U+1D512</ins></td> </tr> <tr> <td><code title="">Ograve;</code></td> <td><del class="diff-old">U+00D2</del> <ins class= "diff-chg">U+000D2</ins></td> </tr> <tr> <td><code title="">Ograve</code></td> <td><del class="diff-old">U+00D2</del> <ins class= "diff-chg">U+000D2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Omacr;</ins></code></td> <td><ins class="diff-chg">U+0014C</ins></td> </tr> <tr> <td><code title="">Omega;</code></td> <td><del class="diff-old">U+03A9</del> <ins class= "diff-chg">U+003A9</ins></td> </tr> <tr> <td><code title="">Omicron;</code></td> <td><del class="diff-old">U+039F</del> <ins class= "diff-chg">U+0039F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Oopf;</ins></code></td> <td><ins class="diff-chg">U+1D546</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">OpenCurlyDoubleQuote;</ins></code></td> <td><ins class="diff-chg">U+0201C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">OpenCurlyQuote;</ins></code></td> <td><ins class="diff-chg">U+02018</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Or;</ins></code></td> <td><ins class="diff-chg">U+02A54</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Oscr;</ins></code></td> <td><ins class="diff-chg">U+1D4AA</ins></td> </tr> <tr> <td><code title="">Oslash;</code></td> <td><del class="diff-old">U+00D8</del> <ins class= "diff-chg">U+000D8</ins></td> </tr> <tr> <td><code title="">Oslash</code></td> <td><del class="diff-old">U+00D8</del> <ins class= "diff-chg">U+000D8</ins></td> </tr> <tr> <td><code title="">Otilde;</code></td> <td><del class="diff-old">U+00D5</del> <ins class= "diff-chg">U+000D5</ins></td> </tr> <tr> <td><code title="">Otilde</code></td> <td><del class="diff-old">U+00D5</del> <ins class= "diff-chg">U+000D5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Otimes;</ins></code></td> <td><ins class="diff-chg">U+02A37</ins></td> </tr> <tr> <td><code title="">Ouml;</code></td> <td><del class="diff-old">U+00D6</del> <ins class= "diff-chg">U+000D6</ins></td> </tr> <tr> <td><code title="">Ouml</code></td> <td><del class="diff-old">U+00D6</del> <ins class= "diff-chg">U+000D6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">OverBar;</ins></code></td> <td><ins class="diff-chg">U+000AF</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">OverBrace;</ins></code></td> <td><ins class="diff-chg">U+023DE</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">OverBracket;</ins></code></td> <td><ins class="diff-chg">U+023B4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">OverParenthesis;</ins></code></td> <td><ins class="diff-chg">U+023DC</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">PartialD;</ins></code></td> <td><ins class="diff-chg">U+02202</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Pcy;</ins></code></td> <td><ins class="diff-chg">U+0041F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Pfr;</ins></code></td> <td><ins class="diff-chg">U+1D513</ins></td> </tr> <tr> <td><code title="">Phi;</code></td> <td><del class="diff-old">U+03A6</del> <ins class= "diff-chg">U+003A6</ins></td> </tr> <tr> <td><code title="">Pi;</code></td> <td><del class="diff-old">U+03A0</del> <ins class= "diff-chg">U+003A0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">PlusMinus;</ins></code></td> <td><ins class="diff-chg">U+000B1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Poincareplane;</ins></code></td> <td><ins class="diff-chg">U+0210C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Popf;</ins></code></td> <td><ins class="diff-chg">U+02119</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Pr;</ins></code></td> <td><ins class="diff-chg">U+02ABB</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Precedes;</ins></code></td> <td><ins class="diff-chg">U+0227A</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">PrecedesEqual;</ins></code></td> <td><ins class="diff-chg">U+02AAF</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">PrecedesSlantEqual;</ins></code></td> <td><ins class="diff-chg">U+0227C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">PrecedesTilde;</ins></code></td> <td><ins class="diff-chg">U+0227E</ins></td> </tr> <tr> <td><code title="">Prime;</code></td> <td><del class="diff-old">U+2033</del> <ins class= "diff-chg">U+02033</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Product;</ins></code></td> <td><ins class="diff-chg">U+0220F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Proportion;</ins></code></td> <td><ins class="diff-chg">U+02237</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Proportional;</ins></code></td> <td><ins class="diff-chg">U+0221D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Pscr;</ins></code></td> <td><ins class="diff-chg">U+1D4AB</ins></td> </tr> <tr> <td><code title="">Psi;</code></td> <td><del class="diff-old">U+03A8</del> <ins class= "diff-chg">U+003A8</ins></td> </tr> <tr> <td><code title="">QUOT;</code></td> <td><del class="diff-old">U+0022</del> <ins class= "diff-chg">U+00022</ins></td> </tr> <tr> <td><code title="">QUOT</code></td> <td><del class="diff-old">U+0022</del> <ins class= "diff-chg">U+00022</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Qfr;</ins></code></td> <td><ins class="diff-chg">U+1D514</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Qopf;</ins></code></td> <td><ins class="diff-chg">U+0211A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Qscr;</ins></code></td> <td><ins class="diff-chg">U+1D4AC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">RBarr;</ins></code></td> <td><ins class="diff-chg">U+02910</ins></td> </tr> <tr> <td><code title="">REG;</code></td> <td><del class="diff-old">U+00AE</del> <ins class= "diff-chg">U+000AE</ins></td> </tr> <tr> <td><code title="">REG</code></td> <td><del class="diff-old">U+00AE</del> <ins class= "diff-chg">U+000AE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Racute;</ins></code></td> <td><ins class="diff-chg">U+00154</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Rang;</ins></code></td> <td><ins class="diff-chg">U+027EB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Rarr;</ins></code></td> <td><ins class="diff-chg">U+021A0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Rarrtl;</ins></code></td> <td><ins class="diff-chg">U+02916</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Rcaron;</ins></code></td> <td><ins class="diff-chg">U+00158</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Rcedil;</ins></code></td> <td><ins class="diff-chg">U+00156</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Rcy;</ins></code></td> <td><ins class="diff-chg">U+00420</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Re;</ins></code></td> <td><ins class="diff-chg">U+0211C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ReverseElement;</ins></code></td> <td><ins class="diff-chg">U+0220B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ReverseEquilibrium;</ins></code></td> <td><ins class="diff-chg">U+021CB</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ReverseUpEquilibrium;</ins></code></td> <td><ins class="diff-chg">U+0296F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Rfr;</ins></code></td> <td><ins class="diff-chg">U+0211C</ins></td> </tr> <tr> <td><code title="">Rho;</code></td> <td><del class="diff-old">U+03A1</del> <ins class= "diff-chg">U+003A1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightAngleBracket;</ins></code></td> <td><ins class="diff-chg">U+027E9</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightArrow;</ins></code></td> <td><ins class="diff-chg">U+02192</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightArrowBar;</ins></code></td> <td><ins class="diff-chg">U+021E5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightArrowLeftArrow;</ins></code></td> <td><ins class="diff-chg">U+021C4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightCeiling;</ins></code></td> <td><ins class="diff-chg">U+02309</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightDoubleBracket;</ins></code></td> <td><ins class="diff-chg">U+027E7</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightDownTeeVector;</ins></code></td> <td><ins class="diff-chg">U+0295D</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightDownVector;</ins></code></td> <td><ins class="diff-chg">U+021C2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightDownVectorBar;</ins></code></td> <td><ins class="diff-chg">U+02955</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightFloor;</ins></code></td> <td><ins class="diff-chg">U+0230B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightTee;</ins></code></td> <td><ins class="diff-chg">U+022A2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightTeeArrow;</ins></code></td> <td><ins class="diff-chg">U+021A6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightTeeVector;</ins></code></td> <td><ins class="diff-chg">U+0295B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightTriangle;</ins></code></td> <td><ins class="diff-chg">U+022B3</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightTriangleBar;</ins></code></td> <td><ins class="diff-chg">U+029D0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightTriangleEqual;</ins></code></td> <td><ins class="diff-chg">U+022B5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightUpDownVector;</ins></code></td> <td><ins class="diff-chg">U+0294F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightUpTeeVector;</ins></code></td> <td><ins class="diff-chg">U+0295C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightUpVector;</ins></code></td> <td><ins class="diff-chg">U+021BE</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightUpVectorBar;</ins></code></td> <td><ins class="diff-chg">U+02954</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightVector;</ins></code></td> <td><ins class="diff-chg">U+021C0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RightVectorBar;</ins></code></td> <td><ins class="diff-chg">U+02953</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Rightarrow;</ins></code></td> <td><ins class="diff-chg">U+021D2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ropf;</ins></code></td> <td><ins class="diff-chg">U+0211D</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RoundImplies;</ins></code></td> <td><ins class="diff-chg">U+02970</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Rrightarrow;</ins></code></td> <td><ins class="diff-chg">U+021DB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Rscr;</ins></code></td> <td><ins class="diff-chg">U+0211B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Rsh;</ins></code></td> <td><ins class="diff-chg">U+021B1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">RuleDelayed;</ins></code></td> <td><ins class="diff-chg">U+029F4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">SHCHcy;</ins></code></td> <td><ins class="diff-chg">U+00429</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">SHcy;</ins></code></td> <td><ins class="diff-chg">U+00428</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">SOFTcy;</ins></code></td> <td><ins class="diff-chg">U+0042C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Sacute;</ins></code></td> <td><ins class="diff-chg">U+0015A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Sc;</ins></code></td> <td><ins class="diff-chg">U+02ABC</ins></td> </tr> <tr> <td><code title="">Scaron;</code></td> <td><del class="diff-old">U+0160</del> <ins class= "diff-chg">U+00160</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Scedil;</ins></code></td> <td><ins class="diff-chg">U+0015E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Scirc;</ins></code></td> <td><ins class="diff-chg">U+0015C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Scy;</ins></code></td> <td><ins class="diff-chg">U+00421</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Sfr;</ins></code></td> <td><ins class="diff-chg">U+1D516</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ShortDownArrow;</ins></code></td> <td><ins class="diff-chg">U+02193</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ShortLeftArrow;</ins></code></td> <td><ins class="diff-chg">U+02190</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ShortRightArrow;</ins></code></td> <td><ins class="diff-chg">U+02192</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ShortUpArrow;</ins></code></td> <td><ins class="diff-chg">U+02191</ins></td> </tr> <tr> <td><code title="">Sigma;</code></td> <td><del class="diff-old">U+03A3</del> <ins class= "diff-chg">U+003A3</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">SmallCircle;</ins></code></td> <td><ins class="diff-chg">U+02218</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Sopf;</ins></code></td> <td><ins class="diff-chg">U+1D54A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Sqrt;</ins></code></td> <td><ins class="diff-chg">U+0221A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Square;</ins></code></td> <td><ins class="diff-chg">U+025A1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">SquareIntersection;</ins></code></td> <td><ins class="diff-chg">U+02293</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">SquareSubset;</ins></code></td> <td><ins class="diff-chg">U+0228F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">SquareSubsetEqual;</ins></code></td> <td><ins class="diff-chg">U+02291</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">SquareSuperset;</ins></code></td> <td><ins class="diff-chg">U+02290</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">SquareSupersetEqual;</ins></code></td> <td><ins class="diff-chg">U+02292</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">SquareUnion;</ins></code></td> <td><ins class="diff-chg">U+02294</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Sscr;</ins></code></td> <td><ins class="diff-chg">U+1D4AE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Star;</ins></code></td> <td><ins class="diff-chg">U+022C6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Sub;</ins></code></td> <td><ins class="diff-chg">U+022D0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Subset;</ins></code></td> <td><ins class="diff-chg">U+022D0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">SubsetEqual;</ins></code></td> <td><ins class="diff-chg">U+02286</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Succeeds;</ins></code></td> <td><ins class="diff-chg">U+0227B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">SucceedsEqual;</ins></code></td> <td><ins class="diff-chg">U+02AB0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">SucceedsSlantEqual;</ins></code></td> <td><ins class="diff-chg">U+0227D</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">SucceedsTilde;</ins></code></td> <td><ins class="diff-chg">U+0227F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">SuchThat;</ins></code></td> <td><ins class="diff-chg">U+0220B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Sum;</ins></code></td> <td><ins class="diff-chg">U+02211</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Sup;</ins></code></td> <td><ins class="diff-chg">U+022D1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Superset;</ins></code></td> <td><ins class="diff-chg">U+02283</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">SupersetEqual;</ins></code></td> <td><ins class="diff-chg">U+02287</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Supset;</ins></code></td> <td><ins class="diff-chg">U+022D1</ins></td> </tr> <tr> <td><code title="">THORN;</code></td> <td><del class="diff-old">U+00DE</del> <ins class= "diff-chg">U+000DE</ins></td> </tr> <tr> <td><code title="">THORN</code></td> <td><del class="diff-old">U+00DE</del> <ins class= "diff-chg">U+000DE</ins></td> </tr> <tr> <td><code title="">TRADE;</code></td> <td><del class="diff-old">U+2122</del> <ins class= "diff-chg">U+02122</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">TSHcy;</ins></code></td> <td><ins class="diff-chg">U+0040B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">TScy;</ins></code></td> <td><ins class="diff-chg">U+00426</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Tab;</ins></code></td> <td><ins class="diff-chg">U+00009</ins></td> </tr> <tr> <td><code title="">Tau;</code></td> <td><del class="diff-old">U+03A4</del> <ins class= "diff-chg">U+003A4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Tcaron;</ins></code></td> <td><ins class="diff-chg">U+00164</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Tcedil;</ins></code></td> <td><ins class="diff-chg">U+00162</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Tcy;</ins></code></td> <td><ins class="diff-chg">U+00422</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Tfr;</ins></code></td> <td><ins class="diff-chg">U+1D517</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Therefore;</ins></code></td> <td><ins class="diff-chg">U+02234</ins></td> </tr> <tr> <td><code title="">Theta;</code></td> <td><del class="diff-old">U+0398</del> <ins class= "diff-chg">U+00398</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ThinSpace;</ins></code></td> <td><ins class="diff-chg">U+02009</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Tilde;</ins></code></td> <td><ins class="diff-chg">U+0223C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">TildeEqual;</ins></code></td> <td><ins class="diff-chg">U+02243</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">TildeFullEqual;</ins></code></td> <td><ins class="diff-chg">U+02245</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">TildeTilde;</ins></code></td> <td><ins class="diff-chg">U+02248</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Topf;</ins></code></td> <td><ins class="diff-chg">U+1D54B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">TripleDot;</ins></code></td> <td><ins class="diff-chg">U+020DB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Tscr;</ins></code></td> <td><ins class="diff-chg">U+1D4AF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Tstrok;</ins></code></td> <td><ins class="diff-chg">U+00166</ins></td> </tr> <tr> <td><code title="">Uacute;</code></td> <td><del class="diff-old">U+00DA</del> <ins class= "diff-chg">U+000DA</ins></td> </tr> <tr> <td><code title="">Uacute</code></td> <td><del class="diff-old">U+00DA</del> <ins class= "diff-chg">U+000DA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Uarr;</ins></code></td> <td><ins class="diff-chg">U+0219F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Uarrocir;</ins></code></td> <td><ins class="diff-chg">U+02949</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ubrcy;</ins></code></td> <td><ins class="diff-chg">U+0040E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ubreve;</ins></code></td> <td><ins class="diff-chg">U+0016C</ins></td> </tr> <tr> <td><code title="">Ucirc;</code></td> <td><del class="diff-old">U+00DB</del> <ins class= "diff-chg">U+000DB</ins></td> </tr> <tr> <td><code title="">Ucirc</code></td> <td><del class="diff-old">U+00DB</del> <ins class= "diff-chg">U+000DB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ucy;</ins></code></td> <td><ins class="diff-chg">U+00423</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Udblac;</ins></code></td> <td><ins class="diff-chg">U+00170</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ufr;</ins></code></td> <td><ins class="diff-chg">U+1D518</ins></td> </tr> <tr> <td><code title="">Ugrave;</code></td> <td><del class="diff-old">U+00D9</del> <ins class= "diff-chg">U+000D9</ins></td> </tr> <tr> <td><code title="">Ugrave</code></td> <td><del class="diff-old">U+00D9</del> <ins class= "diff-chg">U+000D9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Umacr;</ins></code></td> <td><ins class="diff-chg">U+0016A</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">UnderBar;</ins></code></td> <td><ins class="diff-chg">U+00332</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">UnderBrace;</ins></code></td> <td><ins class="diff-chg">U+023DF</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">UnderBracket;</ins></code></td> <td><ins class="diff-chg">U+023B5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">UnderParenthesis;</ins></code></td> <td><ins class="diff-chg">U+023DD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Union;</ins></code></td> <td><ins class="diff-chg">U+022C3</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">UnionPlus;</ins></code></td> <td><ins class="diff-chg">U+0228E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Uogon;</ins></code></td> <td><ins class="diff-chg">U+00172</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Uopf;</ins></code></td> <td><ins class="diff-chg">U+1D54C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">UpArrow;</ins></code></td> <td><ins class="diff-chg">U+02191</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">UpArrowBar;</ins></code></td> <td><ins class="diff-chg">U+02912</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">UpArrowDownArrow;</ins></code></td> <td><ins class="diff-chg">U+021C5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">UpDownArrow;</ins></code></td> <td><ins class="diff-chg">U+02195</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">UpEquilibrium;</ins></code></td> <td><ins class="diff-chg">U+0296E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">UpTee;</ins></code></td> <td><ins class="diff-chg">U+022A5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">UpTeeArrow;</ins></code></td> <td><ins class="diff-chg">U+021A5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Uparrow;</ins></code></td> <td><ins class="diff-chg">U+021D1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">Updownarrow;</ins></code></td> <td><ins class="diff-chg">U+021D5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">UpperLeftArrow;</ins></code></td> <td><ins class="diff-chg">U+02196</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">UpperRightArrow;</ins></code></td> <td><ins class="diff-chg">U+02197</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Upsi;</ins></code></td> <td><ins class="diff-chg">U+003D2</ins></td> </tr> <tr> <td><code title="">Upsilon;</code></td> <td><del class="diff-old">U+03A5</del> <ins class= "diff-chg">U+003A5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Uring;</ins></code></td> <td><ins class="diff-chg">U+0016E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Uscr;</ins></code></td> <td><ins class="diff-chg">U+1D4B0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Utilde;</ins></code></td> <td><ins class="diff-chg">U+00168</ins></td> </tr> <tr> <td><code title="">Uuml;</code></td> <td><del class="diff-old">U+00DC</del> <ins class= "diff-chg">U+000DC</ins></td> </tr> <tr> <td><code title="">Uuml</code></td> <td><del class="diff-old">U+00DC</del> <ins class= "diff-chg">U+000DC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">VDash;</ins></code></td> <td><ins class="diff-chg">U+022AB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Vbar;</ins></code></td> <td><ins class="diff-chg">U+02AEB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Vcy;</ins></code></td> <td><ins class="diff-chg">U+00412</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Vdash;</ins></code></td> <td><ins class="diff-chg">U+022A9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Vdashl;</ins></code></td> <td><ins class="diff-chg">U+02AE6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Vee;</ins></code></td> <td><ins class="diff-chg">U+022C1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Verbar;</ins></code></td> <td><ins class="diff-chg">U+02016</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Vert;</ins></code></td> <td><ins class="diff-chg">U+02016</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">VerticalBar;</ins></code></td> <td><ins class="diff-chg">U+02223</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">VerticalLine;</ins></code></td> <td><ins class="diff-chg">U+0007C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">VerticalSeparator;</ins></code></td> <td><ins class="diff-chg">U+02758</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">VerticalTilde;</ins></code></td> <td><ins class="diff-chg">U+02240</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">VeryThinSpace;</ins></code></td> <td><ins class="diff-chg">U+0200A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Vfr;</ins></code></td> <td><ins class="diff-chg">U+1D519</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Vopf;</ins></code></td> <td><ins class="diff-chg">U+1D54D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Vscr;</ins></code></td> <td><ins class="diff-chg">U+1D4B1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Vvdash;</ins></code></td> <td><ins class="diff-chg">U+022AA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Wcirc;</ins></code></td> <td><ins class="diff-chg">U+00174</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Wedge;</ins></code></td> <td><ins class="diff-chg">U+022C0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Wfr;</ins></code></td> <td><ins class="diff-chg">U+1D51A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Wopf;</ins></code></td> <td><ins class="diff-chg">U+1D54E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Wscr;</ins></code></td> <td><ins class="diff-chg">U+1D4B2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Xfr;</ins></code></td> <td><ins class="diff-chg">U+1D51B</ins></td> </tr> <tr> <td><code title="">Xi;</code></td> <td><del class="diff-old">U+039E</del> <ins class= "diff-chg">U+0039E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Xopf;</ins></code></td> <td><ins class="diff-chg">U+1D54F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Xscr;</ins></code></td> <td><ins class="diff-chg">U+1D4B3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">YAcy;</ins></code></td> <td><ins class="diff-chg">U+0042F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">YIcy;</ins></code></td> <td><ins class="diff-chg">U+00407</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">YUcy;</ins></code></td> <td><ins class="diff-chg">U+0042E</ins></td> </tr> <tr> <td><code title="">Yacute;</code></td> <td><del class="diff-old">U+00DD</del> <ins class= "diff-chg">U+000DD</ins></td> </tr> <tr> <td><code title="">Yacute</code></td> <td><del class="diff-old">U+00DD</del> <ins class= "diff-chg">U+000DD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ycirc;</ins></code></td> <td><ins class="diff-chg">U+00176</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Ycy;</ins></code></td> <td><ins class="diff-chg">U+0042B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Yfr;</ins></code></td> <td><ins class="diff-chg">U+1D51C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Yopf;</ins></code></td> <td><ins class="diff-chg">U+1D550</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Yscr;</ins></code></td> <td><ins class="diff-chg">U+1D4B4</ins></td> </tr> <tr> <td><code title="">Yuml;</code></td> <td><del class="diff-old">U+0178</del> <ins class= "diff-chg">U+00178</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ZHcy;</ins></code></td> <td><ins class="diff-chg">U+00416</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Zacute;</ins></code></td> <td><ins class="diff-chg">U+00179</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Zcaron;</ins></code></td> <td><ins class="diff-chg">U+0017D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Zcy;</ins></code></td> <td><ins class="diff-chg">U+00417</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Zdot;</ins></code></td> <td><ins class="diff-chg">U+0017B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ZeroWidthSpace;</ins></code></td> <td><ins class="diff-chg">U+0200B</ins></td> </tr> <tr> <td><code title="">Zeta;</code></td> <td><del class="diff-old">U+0396</del> <ins class= "diff-chg">U+00396</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Zfr;</ins></code></td> <td><ins class="diff-chg">U+02128</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Zopf;</ins></code></td> <td><ins class="diff-chg">U+02124</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">Zscr;</ins></code></td> <td><ins class="diff-chg">U+1D4B5</ins></td> </tr> <tr> <td><code title="">aacute;</code></td> <td><del class="diff-old">U+00E1</del> <ins class= "diff-chg">U+000E1</ins></td> </tr> <tr> <td><code title="">aacute</code></td> <td><del class="diff-old">U+00E1</del> <ins class= "diff-chg">U+000E1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">abreve;</ins></code></td> <td><ins class="diff-chg">U+00103</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ac;</ins></code></td> <td><ins class="diff-chg">U+0223E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">acd;</ins></code></td> <td><ins class="diff-chg">U+0223F</ins></td> </tr> <tr> <td><code title="">acirc;</code></td> <td><del class="diff-old">U+00E2</del> <ins class= "diff-chg">U+000E2</ins></td> </tr> <tr> <td><code title="">acirc</code></td> <td><del class="diff-old">U+00E2</del> <ins class= "diff-chg">U+000E2</ins></td> </tr> <tr> <td><code title="">acute;</code></td> <td><del class="diff-old">U+00B4</del> <ins class= "diff-chg">U+000B4</ins></td> </tr> <tr> <td><code title="">acute</code></td> <td><del class="diff-old">U+00B4</del> <ins class= "diff-chg">U+000B4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">acy;</ins></code></td> <td><ins class="diff-chg">U+00430</ins></td> </tr> <tr> <td><code title="">aelig;</code></td> <td><del class="diff-old">U+00E6</del> <ins class= "diff-chg">U+000E6</ins></td> </tr> <tr> <td><code title="">aelig</code></td> <td><del class="diff-old">U+00E6</del> <ins class= "diff-chg">U+000E6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">af;</ins></code></td> <td><ins class="diff-chg">U+02061</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">afr;</ins></code></td> <td><ins class="diff-chg">U+1D51E</ins></td> </tr> <tr> <td><code title="">agrave;</code></td> <td><del class="diff-old">U+00E0</del> <ins class= "diff-chg">U+000E0</ins></td> </tr> <tr> <td><code title="">agrave</code></td> <td><del class="diff-old">U+00E0</del> <ins class= "diff-chg">U+000E0</ins></td> </tr> <tr> <td><code title="">alefsym;</code></td> <td><del class="diff-old">U+2135</del> <ins class= "diff-chg">U+02135</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">aleph;</ins></code></td> <td><ins class="diff-chg">U+02135</ins></td> </tr> <tr> <td><code title="">alpha;</code></td> <td><del class="diff-old">U+03B1</del> <ins class= "diff-chg">U+003B1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">amacr;</ins></code></td> <td><ins class="diff-chg">U+00101</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">amalg;</ins></code></td> <td><ins class="diff-chg">U+02A3F</ins></td> </tr> <tr> <td><code title="">amp;</code></td> <td><del class="diff-old">U+0026</del> <ins class= "diff-chg">U+00026</ins></td> </tr> <tr> <td><code title="">amp</code></td> <td><del class="diff-old">U+0026</del> <ins class= "diff-chg">U+00026</ins></td> </tr> <tr> <td><code title="">and;</code></td> <td><del class="diff-old">U+2227</del> <ins class= "diff-chg">U+02227</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">andand;</ins></code></td> <td><ins class="diff-chg">U+02A55</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">andd;</ins></code></td> <td><ins class="diff-chg">U+02A5C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">andslope;</ins></code></td> <td><ins class="diff-chg">U+02A58</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">andv;</ins></code></td> <td><ins class="diff-chg">U+02A5A</ins></td> </tr> <tr> <td><code title="">ang;</code></td> <td><del class="diff-old">U+2220</del> <ins class= "diff-chg">U+02220</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ange;</ins></code></td> <td><ins class="diff-chg">U+029A4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">angle;</ins></code></td> <td><ins class="diff-chg">U+02220</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">angmsd;</ins></code></td> <td><ins class="diff-chg">U+02221</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">angmsdaa;</ins></code></td> <td><ins class="diff-chg">U+029A8</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">angmsdab;</ins></code></td> <td><ins class="diff-chg">U+029A9</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">angmsdac;</ins></code></td> <td><ins class="diff-chg">U+029AA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">angmsdad;</ins></code></td> <td><ins class="diff-chg">U+029AB</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">angmsdae;</ins></code></td> <td><ins class="diff-chg">U+029AC</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">angmsdaf;</ins></code></td> <td><ins class="diff-chg">U+029AD</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">angmsdag;</ins></code></td> <td><ins class="diff-chg">U+029AE</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">angmsdah;</ins></code></td> <td><ins class="diff-chg">U+029AF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">angrt;</ins></code></td> <td><ins class="diff-chg">U+0221F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">angrtvb;</ins></code></td> <td><ins class="diff-chg">U+022BE</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">angrtvbd;</ins></code></td> <td><ins class="diff-chg">U+0299D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">angsph;</ins></code></td> <td><ins class="diff-chg">U+02222</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">angst;</ins></code></td> <td><ins class="diff-chg">U+0212B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">angzarr;</ins></code></td> <td><ins class="diff-chg">U+0237C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">aogon;</ins></code></td> <td><ins class="diff-chg">U+00105</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">aopf;</ins></code></td> <td><ins class="diff-chg">U+1D552</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ap;</ins></code></td> <td><ins class="diff-chg">U+02248</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">apE;</ins></code></td> <td><ins class="diff-chg">U+02A70</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">apacir;</ins></code></td> <td><ins class="diff-chg">U+02A6F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ape;</ins></code></td> <td><ins class="diff-chg">U+0224A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">apid;</ins></code></td> <td><ins class="diff-chg">U+0224B</ins></td> </tr> <tr> <td><code title="">apos;</code></td> <td><del class="diff-old">U+0027</del> <ins class= "diff-chg">U+00027</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">approx;</ins></code></td> <td><ins class="diff-chg">U+02248</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">approxeq;</ins></code></td> <td><ins class="diff-chg">U+0224A</ins></td> </tr> <tr> <td><code title="">aring;</code></td> <td><del class="diff-old">U+00E5</del> <ins class= "diff-chg">U+000E5</ins></td> </tr> <tr> <td><code title="">aring</code></td> <td><del class="diff-old">U+00E5</del> <ins class= "diff-chg">U+000E5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ascr;</ins></code></td> <td><ins class="diff-chg">U+1D4B6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ast;</ins></code></td> <td><ins class="diff-chg">U+0002A</ins></td> </tr> <tr> <td><code title="">asymp;</code></td> <td><del class="diff-old">U+2248</del> <ins class= "diff-chg">U+02248</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">asympeq;</ins></code></td> <td><ins class="diff-chg">U+0224D</ins></td> </tr> <tr> <td><code title="">atilde;</code></td> <td><del class="diff-old">U+00E3</del> <ins class= "diff-chg">U+000E3</ins></td> </tr> <tr> <td><code title="">atilde</code></td> <td><del class="diff-old">U+00E3</del> <ins class= "diff-chg">U+000E3</ins></td> </tr> <tr> <td><code title="">auml;</code></td> <td><del class="diff-old">U+00E4</del> <ins class= "diff-chg">U+000E4</ins></td> </tr> <tr> <td><code title="">auml</code></td> <td><del class="diff-old">U+00E4</del> <ins class= "diff-chg">U+000E4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">awconint;</ins></code></td> <td><ins class="diff-chg">U+02233</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">awint;</ins></code></td> <td><ins class="diff-chg">U+02A11</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bNot;</ins></code></td> <td><ins class="diff-chg">U+02AED</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">backcong;</ins></code></td> <td><ins class="diff-chg">U+0224C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">backepsilon;</ins></code></td> <td><ins class="diff-chg">U+003F6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">backprime;</ins></code></td> <td><ins class="diff-chg">U+02035</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">backsim;</ins></code></td> <td><ins class="diff-chg">U+0223D</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">backsimeq;</ins></code></td> <td><ins class="diff-chg">U+022CD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">barvee;</ins></code></td> <td><ins class="diff-chg">U+022BD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">barwed;</ins></code></td> <td><ins class="diff-chg">U+02305</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">barwedge;</ins></code></td> <td><ins class="diff-chg">U+02305</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bbrk;</ins></code></td> <td><ins class="diff-chg">U+023B5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">bbrktbrk;</ins></code></td> <td><ins class="diff-chg">U+023B6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bcong;</ins></code></td> <td><ins class="diff-chg">U+0224C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bcy;</ins></code></td> <td><ins class="diff-chg">U+00431</ins></td> </tr> <tr> <td><code title="">bdquo;</code></td> <td><del class="diff-old">U+201E</del> <ins class= "diff-chg">U+0201E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">becaus;</ins></code></td> <td><ins class="diff-chg">U+02235</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">because;</ins></code></td> <td><ins class="diff-chg">U+02235</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bemptyv;</ins></code></td> <td><ins class="diff-chg">U+029B0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bepsi;</ins></code></td> <td><ins class="diff-chg">U+003F6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bernou;</ins></code></td> <td><ins class="diff-chg">U+0212C</ins></td> </tr> <tr> <td><code title="">beta;</code></td> <td><del class="diff-old">U+03B2</del> <ins class= "diff-chg">U+003B2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">beth;</ins></code></td> <td><ins class="diff-chg">U+02136</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">between;</ins></code></td> <td><ins class="diff-chg">U+0226C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bfr;</ins></code></td> <td><ins class="diff-chg">U+1D51F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bigcap;</ins></code></td> <td><ins class="diff-chg">U+022C2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bigcirc;</ins></code></td> <td><ins class="diff-chg">U+025EF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bigcup;</ins></code></td> <td><ins class="diff-chg">U+022C3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bigodot;</ins></code></td> <td><ins class="diff-chg">U+02A00</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">bigoplus;</ins></code></td> <td><ins class="diff-chg">U+02A01</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">bigotimes;</ins></code></td> <td><ins class="diff-chg">U+02A02</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">bigsqcup;</ins></code></td> <td><ins class="diff-chg">U+02A06</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bigstar;</ins></code></td> <td><ins class="diff-chg">U+02605</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">bigtriangledown;</ins></code></td> <td><ins class="diff-chg">U+025BD</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">bigtriangleup;</ins></code></td> <td><ins class="diff-chg">U+025B3</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">biguplus;</ins></code></td> <td><ins class="diff-chg">U+02A04</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bigvee;</ins></code></td> <td><ins class="diff-chg">U+022C1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">bigwedge;</ins></code></td> <td><ins class="diff-chg">U+022C0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bkarow;</ins></code></td> <td><ins class="diff-chg">U+0290D</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">blacklozenge;</ins></code></td> <td><ins class="diff-chg">U+029EB</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">blacksquare;</ins></code></td> <td><ins class="diff-chg">U+025AA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">blacktriangle;</ins></code></td> <td><ins class="diff-chg">U+025B4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">blacktriangledown;</ins></code></td> <td><ins class="diff-chg">U+025BE</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">blacktriangleleft;</ins></code></td> <td><ins class="diff-chg">U+025C2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">blacktriangleright;</ins></code></td> <td><ins class="diff-chg">U+025B8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">blank;</ins></code></td> <td><ins class="diff-chg">U+02423</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">blk12;</ins></code></td> <td><ins class="diff-chg">U+02592</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">blk14;</ins></code></td> <td><ins class="diff-chg">U+02591</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">blk34;</ins></code></td> <td><ins class="diff-chg">U+02593</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">block;</ins></code></td> <td><ins class="diff-chg">U+02588</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bnot;</ins></code></td> <td><ins class="diff-chg">U+02310</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bopf;</ins></code></td> <td><ins class="diff-chg">U+1D553</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bot;</ins></code></td> <td><ins class="diff-chg">U+022A5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bottom;</ins></code></td> <td><ins class="diff-chg">U+022A5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bowtie;</ins></code></td> <td><ins class="diff-chg">U+022C8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxDL;</ins></code></td> <td><ins class="diff-chg">U+02557</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxDR;</ins></code></td> <td><ins class="diff-chg">U+02554</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxDl;</ins></code></td> <td><ins class="diff-chg">U+02556</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxDr;</ins></code></td> <td><ins class="diff-chg">U+02553</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxH;</ins></code></td> <td><ins class="diff-chg">U+02550</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxHD;</ins></code></td> <td><ins class="diff-chg">U+02566</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxHU;</ins></code></td> <td><ins class="diff-chg">U+02569</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxHd;</ins></code></td> <td><ins class="diff-chg">U+02564</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxHu;</ins></code></td> <td><ins class="diff-chg">U+02567</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxUL;</ins></code></td> <td><ins class="diff-chg">U+0255D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxUR;</ins></code></td> <td><ins class="diff-chg">U+0255A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxUl;</ins></code></td> <td><ins class="diff-chg">U+0255C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxUr;</ins></code></td> <td><ins class="diff-chg">U+02559</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxV;</ins></code></td> <td><ins class="diff-chg">U+02551</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxVH;</ins></code></td> <td><ins class="diff-chg">U+0256C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxVL;</ins></code></td> <td><ins class="diff-chg">U+02563</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxVR;</ins></code></td> <td><ins class="diff-chg">U+02560</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxVh;</ins></code></td> <td><ins class="diff-chg">U+0256B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxVl;</ins></code></td> <td><ins class="diff-chg">U+02562</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxVr;</ins></code></td> <td><ins class="diff-chg">U+0255F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxbox;</ins></code></td> <td><ins class="diff-chg">U+029C9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxdL;</ins></code></td> <td><ins class="diff-chg">U+02555</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxdR;</ins></code></td> <td><ins class="diff-chg">U+02552</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxdl;</ins></code></td> <td><ins class="diff-chg">U+02510</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxdr;</ins></code></td> <td><ins class="diff-chg">U+0250C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxh;</ins></code></td> <td><ins class="diff-chg">U+02500</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxhD;</ins></code></td> <td><ins class="diff-chg">U+02565</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxhU;</ins></code></td> <td><ins class="diff-chg">U+02568</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxhd;</ins></code></td> <td><ins class="diff-chg">U+0252C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxhu;</ins></code></td> <td><ins class="diff-chg">U+02534</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">boxminus;</ins></code></td> <td><ins class="diff-chg">U+0229F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxplus;</ins></code></td> <td><ins class="diff-chg">U+0229E</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">boxtimes;</ins></code></td> <td><ins class="diff-chg">U+022A0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxuL;</ins></code></td> <td><ins class="diff-chg">U+0255B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxuR;</ins></code></td> <td><ins class="diff-chg">U+02558</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxul;</ins></code></td> <td><ins class="diff-chg">U+02518</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxur;</ins></code></td> <td><ins class="diff-chg">U+02514</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxv;</ins></code></td> <td><ins class="diff-chg">U+02502</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxvH;</ins></code></td> <td><ins class="diff-chg">U+0256A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxvL;</ins></code></td> <td><ins class="diff-chg">U+02561</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxvR;</ins></code></td> <td><ins class="diff-chg">U+0255E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxvh;</ins></code></td> <td><ins class="diff-chg">U+0253C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxvl;</ins></code></td> <td><ins class="diff-chg">U+02524</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">boxvr;</ins></code></td> <td><ins class="diff-chg">U+0251C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bprime;</ins></code></td> <td><ins class="diff-chg">U+02035</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">breve;</ins></code></td> <td><ins class="diff-chg">U+002D8</ins></td> </tr> <tr> <td><code title="">brvbar;</code></td> <td><del class="diff-old">U+00A6</del> <ins class= "diff-chg">U+000A6</ins></td> </tr> <tr> <td><code title="">brvbar</code></td> <td><del class="diff-old">U+00A6</del> <ins class= "diff-chg">U+000A6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bscr;</ins></code></td> <td><ins class="diff-chg">U+1D4B7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bsemi;</ins></code></td> <td><ins class="diff-chg">U+0204F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bsim;</ins></code></td> <td><ins class="diff-chg">U+0223D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bsime;</ins></code></td> <td><ins class="diff-chg">U+022CD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bsol;</ins></code></td> <td><ins class="diff-chg">U+0005C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bsolb;</ins></code></td> <td><ins class="diff-chg">U+029C5</ins></td> </tr> <tr> <td><code title="">bull;</code></td> <td><del class="diff-old">U+2022</del> <ins class= "diff-chg">U+02022</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bullet;</ins></code></td> <td><ins class="diff-chg">U+02022</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bump;</ins></code></td> <td><ins class="diff-chg">U+0224E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bumpE;</ins></code></td> <td><ins class="diff-chg">U+02AAE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bumpe;</ins></code></td> <td><ins class="diff-chg">U+0224F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">bumpeq;</ins></code></td> <td><ins class="diff-chg">U+0224F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cacute;</ins></code></td> <td><ins class="diff-chg">U+00107</ins></td> </tr> <tr> <td><code title="">cap;</code></td> <td><del class="diff-old">U+2229</del> <ins class= "diff-chg">U+02229</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">capand;</ins></code></td> <td><ins class="diff-chg">U+02A44</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">capbrcup;</ins></code></td> <td><ins class="diff-chg">U+02A49</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">capcap;</ins></code></td> <td><ins class="diff-chg">U+02A4B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">capcup;</ins></code></td> <td><ins class="diff-chg">U+02A47</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">capdot;</ins></code></td> <td><ins class="diff-chg">U+02A40</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">caret;</ins></code></td> <td><ins class="diff-chg">U+02041</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">caron;</ins></code></td> <td><ins class="diff-chg">U+002C7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ccaps;</ins></code></td> <td><ins class="diff-chg">U+02A4D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ccaron;</ins></code></td> <td><ins class="diff-chg">U+0010D</ins></td> </tr> <tr> <td><code title="">ccedil;</code></td> <td><del class="diff-old">U+00E7</del> <ins class= "diff-chg">U+000E7</ins></td> </tr> <tr> <td><code title="">ccedil</code></td> <td><del class="diff-old">U+00E7</del> <ins class= "diff-chg">U+000E7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ccirc;</ins></code></td> <td><ins class="diff-chg">U+00109</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ccups;</ins></code></td> <td><ins class="diff-chg">U+02A4C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ccupssm;</ins></code></td> <td><ins class="diff-chg">U+02A50</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cdot;</ins></code></td> <td><ins class="diff-chg">U+0010B</ins></td> </tr> <tr> <td><code title="">cedil;</code></td> <td><del class="diff-old">U+00B8</del> <ins class= "diff-chg">U+000B8</ins></td> </tr> <tr> <td><code title="">cedil</code></td> <td><del class="diff-old">U+00B8</del> <ins class= "diff-chg">U+000B8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cemptyv;</ins></code></td> <td><ins class="diff-chg">U+029B2</ins></td> </tr> <tr> <td><code title="">cent;</code></td> <td><del class="diff-old">U+00A2</del> <ins class= "diff-chg">U+000A2</ins></td> </tr> <tr> <td><code title="">cent</code></td> <td><del class="diff-old">U+00A2</del> <ins class= "diff-chg">U+000A2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">centerdot;</ins></code></td> <td><ins class="diff-chg">U+000B7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cfr;</ins></code></td> <td><ins class="diff-chg">U+1D520</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">chcy;</ins></code></td> <td><ins class="diff-chg">U+00447</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">check;</ins></code></td> <td><ins class="diff-chg">U+02713</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">checkmark;</ins></code></td> <td><ins class="diff-chg">U+02713</ins></td> </tr> <tr> <td><code title="">chi;</code></td> <td><del class="diff-old">U+03C7</del> <ins class= "diff-chg">U+003C7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cir;</ins></code></td> <td><ins class="diff-chg">U+025CB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cirE;</ins></code></td> <td><ins class="diff-chg">U+029C3</ins></td> </tr> <tr> <td><code title="">circ;</code></td> <td><del class="diff-old">U+02C6</del> <ins class= "diff-chg">U+002C6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">circeq;</ins></code></td> <td><ins class="diff-chg">U+02257</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">circlearrowleft;</ins></code></td> <td><ins class="diff-chg">U+021BA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">circlearrowright;</ins></code></td> <td><ins class="diff-chg">U+021BB</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">circledR;</ins></code></td> <td><ins class="diff-chg">U+000AE</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">circledS;</ins></code></td> <td><ins class="diff-chg">U+024C8</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">circledast;</ins></code></td> <td><ins class="diff-chg">U+0229B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">circledcirc;</ins></code></td> <td><ins class="diff-chg">U+0229A</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">circleddash;</ins></code></td> <td><ins class="diff-chg">U+0229D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cire;</ins></code></td> <td><ins class="diff-chg">U+02257</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">cirfnint;</ins></code></td> <td><ins class="diff-chg">U+02A10</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cirmid;</ins></code></td> <td><ins class="diff-chg">U+02AEF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cirscir;</ins></code></td> <td><ins class="diff-chg">U+029C2</ins></td> </tr> <tr> <td><code title="">clubs;</code></td> <td><del class="diff-old">U+2663</del> <ins class= "diff-chg">U+02663</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">clubsuit;</ins></code></td> <td><ins class="diff-chg">U+02663</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">colon;</ins></code></td> <td><ins class="diff-chg">U+0003A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">colone;</ins></code></td> <td><ins class="diff-chg">U+02254</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">coloneq;</ins></code></td> <td><ins class="diff-chg">U+02254</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">comma;</ins></code></td> <td><ins class="diff-chg">U+0002C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">commat;</ins></code></td> <td><ins class="diff-chg">U+00040</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">comp;</ins></code></td> <td><ins class="diff-chg">U+02201</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">compfn;</ins></code></td> <td><ins class="diff-chg">U+02218</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">complement;</ins></code></td> <td><ins class="diff-chg">U+02201</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">complexes;</ins></code></td> <td><ins class="diff-chg">U+02102</ins></td> </tr> <tr> <td><code title="">cong;</code></td> <td><del class="diff-old">U+2245</del> <ins class= "diff-chg">U+02245</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">congdot;</ins></code></td> <td><ins class="diff-chg">U+02A6D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">conint;</ins></code></td> <td><ins class="diff-chg">U+0222E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">copf;</ins></code></td> <td><ins class="diff-chg">U+1D554</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">coprod;</ins></code></td> <td><ins class="diff-chg">U+02210</ins></td> </tr> <tr> <td><code title="">copy;</code></td> <td><del class="diff-old">U+00A9</del> <ins class= "diff-chg">U+000A9</ins></td> </tr> <tr> <td><code title="">copy</code></td> <td><del class="diff-old">U+00A9</del> <ins class= "diff-chg">U+000A9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">copysr;</ins></code></td> <td><ins class="diff-chg">U+02117</ins></td> </tr> <tr> <td><code title="">crarr;</code></td> <td><del class="diff-old">U+21B5</del> <ins class= "diff-chg">U+021B5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cross;</ins></code></td> <td><ins class="diff-chg">U+02717</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cscr;</ins></code></td> <td><ins class="diff-chg">U+1D4B8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">csub;</ins></code></td> <td><ins class="diff-chg">U+02ACF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">csube;</ins></code></td> <td><ins class="diff-chg">U+02AD1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">csup;</ins></code></td> <td><ins class="diff-chg">U+02AD0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">csupe;</ins></code></td> <td><ins class="diff-chg">U+02AD2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ctdot;</ins></code></td> <td><ins class="diff-chg">U+022EF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cudarrl;</ins></code></td> <td><ins class="diff-chg">U+02938</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cudarrr;</ins></code></td> <td><ins class="diff-chg">U+02935</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cuepr;</ins></code></td> <td><ins class="diff-chg">U+022DE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cuesc;</ins></code></td> <td><ins class="diff-chg">U+022DF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cularr;</ins></code></td> <td><ins class="diff-chg">U+021B6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cularrp;</ins></code></td> <td><ins class="diff-chg">U+0293D</ins></td> </tr> <tr> <td><code title="">cup;</code></td> <td><del class="diff-old">U+222A</del> <ins class= "diff-chg">U+0222A</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">cupbrcap;</ins></code></td> <td><ins class="diff-chg">U+02A48</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cupcap;</ins></code></td> <td><ins class="diff-chg">U+02A46</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cupcup;</ins></code></td> <td><ins class="diff-chg">U+02A4A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cupdot;</ins></code></td> <td><ins class="diff-chg">U+0228D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cupor;</ins></code></td> <td><ins class="diff-chg">U+02A45</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">curarr;</ins></code></td> <td><ins class="diff-chg">U+021B7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">curarrm;</ins></code></td> <td><ins class="diff-chg">U+0293C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">curlyeqprec;</ins></code></td> <td><ins class="diff-chg">U+022DE</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">curlyeqsucc;</ins></code></td> <td><ins class="diff-chg">U+022DF</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">curlyvee;</ins></code></td> <td><ins class="diff-chg">U+022CE</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">curlywedge;</ins></code></td> <td><ins class="diff-chg">U+022CF</ins></td> </tr> <tr> <td><code title="">curren;</code></td> <td><del class="diff-old">U+00A4</del> <ins class= "diff-chg">U+000A4</ins></td> </tr> <tr> <td><code title="">curren</code></td> <td><del class="diff-old">U+00A4</del> <ins class= "diff-chg">U+000A4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">curvearrowleft;</ins></code></td> <td><ins class="diff-chg">U+021B6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">curvearrowright;</ins></code></td> <td><ins class="diff-chg">U+021B7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cuvee;</ins></code></td> <td><ins class="diff-chg">U+022CE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cuwed;</ins></code></td> <td><ins class="diff-chg">U+022CF</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">cwconint;</ins></code></td> <td><ins class="diff-chg">U+02232</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cwint;</ins></code></td> <td><ins class="diff-chg">U+02231</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">cylcty;</ins></code></td> <td><ins class="diff-chg">U+0232D</ins></td> </tr> <tr> <td><code title="">dArr;</code></td> <td><del class="diff-old">U+21D3</del> <ins class= "diff-chg">U+021D3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dHar;</ins></code></td> <td><ins class="diff-chg">U+02965</ins></td> </tr> <tr> <td><code title="">dagger;</code></td> <td><del class="diff-old">U+2020</del> <ins class= "diff-chg">U+02020</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">daleth;</ins></code></td> <td><ins class="diff-chg">U+02138</ins></td> </tr> <tr> <td><code title="">darr;</code></td> <td><del class="diff-old">U+2193</del> <ins class= "diff-chg">U+02193</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dash;</ins></code></td> <td><ins class="diff-chg">U+02010</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dashv;</ins></code></td> <td><ins class="diff-chg">U+022A3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dbkarow;</ins></code></td> <td><ins class="diff-chg">U+0290F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dblac;</ins></code></td> <td><ins class="diff-chg">U+002DD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dcaron;</ins></code></td> <td><ins class="diff-chg">U+0010F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dcy;</ins></code></td> <td><ins class="diff-chg">U+00434</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dd;</ins></code></td> <td><ins class="diff-chg">U+02146</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ddagger;</ins></code></td> <td><ins class="diff-chg">U+02021</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ddarr;</ins></code></td> <td><ins class="diff-chg">U+021CA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ddotseq;</ins></code></td> <td><ins class="diff-chg">U+02A77</ins></td> </tr> <tr> <td><code title="">deg;</code></td> <td><del class="diff-old">U+00B0</del> <ins class= "diff-chg">U+000B0</ins></td> </tr> <tr> <td><code title="">deg</code></td> <td><del class="diff-old">U+00B0</del> <ins class= "diff-chg">U+000B0</ins></td> </tr> <tr> <td><code title="">delta;</code></td> <td><del class="diff-old">U+03B4</del> <ins class= "diff-chg">U+003B4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">demptyv;</ins></code></td> <td><ins class="diff-chg">U+029B1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dfisht;</ins></code></td> <td><ins class="diff-chg">U+0297F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dfr;</ins></code></td> <td><ins class="diff-chg">U+1D521</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dharl;</ins></code></td> <td><ins class="diff-chg">U+021C3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dharr;</ins></code></td> <td><ins class="diff-chg">U+021C2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">diam;</ins></code></td> <td><ins class="diff-chg">U+022C4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">diamond;</ins></code></td> <td><ins class="diff-chg">U+022C4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">diamondsuit;</ins></code></td> <td><ins class="diff-chg">U+02666</ins></td> </tr> <tr> <td><code title="">diams;</code></td> <td><del class="diff-old">U+2666</del> <ins class= "diff-chg">U+02666</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">die;</ins></code></td> <td><ins class="diff-chg">U+000A8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">digamma;</ins></code></td> <td><ins class="diff-chg">U+003DD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">disin;</ins></code></td> <td><ins class="diff-chg">U+022F2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">div;</ins></code></td> <td><ins class="diff-chg">U+000F7</ins></td> </tr> <tr> <td><code title="">divide;</code></td> <td><del class="diff-old">U+00F7</del> <ins class= "diff-chg">U+000F7</ins></td> </tr> <tr> <td><code title="">divide</code></td> <td><del class="diff-old">U+00F7</del> <ins class= "diff-chg">U+000F7</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">divideontimes;</ins></code></td> <td><ins class="diff-chg">U+022C7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">divonx;</ins></code></td> <td><ins class="diff-chg">U+022C7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">djcy;</ins></code></td> <td><ins class="diff-chg">U+00452</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dlcorn;</ins></code></td> <td><ins class="diff-chg">U+0231E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dlcrop;</ins></code></td> <td><ins class="diff-chg">U+0230D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dollar;</ins></code></td> <td><ins class="diff-chg">U+00024</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dopf;</ins></code></td> <td><ins class="diff-chg">U+1D555</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dot;</ins></code></td> <td><ins class="diff-chg">U+002D9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">doteq;</ins></code></td> <td><ins class="diff-chg">U+02250</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">doteqdot;</ins></code></td> <td><ins class="diff-chg">U+02251</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">dotminus;</ins></code></td> <td><ins class="diff-chg">U+02238</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dotplus;</ins></code></td> <td><ins class="diff-chg">U+02214</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">dotsquare;</ins></code></td> <td><ins class="diff-chg">U+022A1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">doublebarwedge;</ins></code></td> <td><ins class="diff-chg">U+02306</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">downarrow;</ins></code></td> <td><ins class="diff-chg">U+02193</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">downdownarrows;</ins></code></td> <td><ins class="diff-chg">U+021CA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">downharpoonleft;</ins></code></td> <td><ins class="diff-chg">U+021C3</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">downharpoonright;</ins></code></td> <td><ins class="diff-chg">U+021C2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">drbkarow;</ins></code></td> <td><ins class="diff-chg">U+02910</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">drcorn;</ins></code></td> <td><ins class="diff-chg">U+0231F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">drcrop;</ins></code></td> <td><ins class="diff-chg">U+0230C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dscr;</ins></code></td> <td><ins class="diff-chg">U+1D4B9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dscy;</ins></code></td> <td><ins class="diff-chg">U+00455</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dsol;</ins></code></td> <td><ins class="diff-chg">U+029F6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dstrok;</ins></code></td> <td><ins class="diff-chg">U+00111</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dtdot;</ins></code></td> <td><ins class="diff-chg">U+022F1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dtri;</ins></code></td> <td><ins class="diff-chg">U+025BF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dtrif;</ins></code></td> <td><ins class="diff-chg">U+025BE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">duarr;</ins></code></td> <td><ins class="diff-chg">U+021F5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">duhar;</ins></code></td> <td><ins class="diff-chg">U+0296F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dwangle;</ins></code></td> <td><ins class="diff-chg">U+029A6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">dzcy;</ins></code></td> <td><ins class="diff-chg">U+0045F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">dzigrarr;</ins></code></td> <td><ins class="diff-chg">U+027FF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">eDDot;</ins></code></td> <td><ins class="diff-chg">U+02A77</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">eDot;</ins></code></td> <td><ins class="diff-chg">U+02251</ins></td> </tr> <tr> <td><code title="">eacute;</code></td> <td><del class="diff-old">U+00E9</del> <ins class= "diff-chg">U+000E9</ins></td> </tr> <tr> <td><code title="">eacute</code></td> <td><del class="diff-old">U+00E9</del> <ins class= "diff-chg">U+000E9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">easter;</ins></code></td> <td><ins class="diff-chg">U+02A6E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ecaron;</ins></code></td> <td><ins class="diff-chg">U+0011B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ecir;</ins></code></td> <td><ins class="diff-chg">U+02256</ins></td> </tr> <tr> <td><code title="">ecirc;</code></td> <td><del class="diff-old">U+00EA</del> <ins class= "diff-chg">U+000EA</ins></td> </tr> <tr> <td><code title="">ecirc</code></td> <td><del class="diff-old">U+00EA</del> <ins class= "diff-chg">U+000EA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ecolon;</ins></code></td> <td><ins class="diff-chg">U+02255</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ecy;</ins></code></td> <td><ins class="diff-chg">U+0044D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">edot;</ins></code></td> <td><ins class="diff-chg">U+00117</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ee;</ins></code></td> <td><ins class="diff-chg">U+02147</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">efDot;</ins></code></td> <td><ins class="diff-chg">U+02252</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">efr;</ins></code></td> <td><ins class="diff-chg">U+1D522</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">eg;</ins></code></td> <td><ins class="diff-chg">U+02A9A</ins></td> </tr> <tr> <td><code title="">egrave;</code></td> <td><del class="diff-old">U+00E8</del> <ins class= "diff-chg">U+000E8</ins></td> </tr> <tr> <td><code title="">egrave</code></td> <td><del class="diff-old">U+00E8</del> <ins class= "diff-chg">U+000E8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">egs;</ins></code></td> <td><ins class="diff-chg">U+02A96</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">egsdot;</ins></code></td> <td><ins class="diff-chg">U+02A98</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">el;</ins></code></td> <td><ins class="diff-chg">U+02A99</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">elinters;</ins></code></td> <td><ins class="diff-chg">U+023E7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ell;</ins></code></td> <td><ins class="diff-chg">U+02113</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">els;</ins></code></td> <td><ins class="diff-chg">U+02A95</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">elsdot;</ins></code></td> <td><ins class="diff-chg">U+02A97</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">emacr;</ins></code></td> <td><ins class="diff-chg">U+00113</ins></td> </tr> <tr> <td><code title="">empty;</code></td> <td><ins class="diff-new">U+02205</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-new">emptyset;</ins></code></td> <td><del class="diff-old">U+2205</del> <ins class= "diff-chg">U+02205</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">emptyv;</ins></code></td> <td><ins class="diff-chg">U+02205</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">emsp13;</ins></code></td> <td><ins class="diff-chg">U+02004</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">emsp14;</ins></code></td> <td><ins class="diff-chg">U+02005</ins></td> </tr> <tr> <td><code title="">emsp;</code></td> <td><del class="diff-old">U+2003</del> <ins class= "diff-chg">U+02003</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">eng;</ins></code></td> <td><ins class="diff-chg">U+0014B</ins></td> </tr> <tr> <td><code title="">ensp;</code></td> <td><del class="diff-old">U+2002</del> <ins class= "diff-chg">U+02002</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">eogon;</ins></code></td> <td><ins class="diff-chg">U+00119</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">eopf;</ins></code></td> <td><ins class="diff-chg">U+1D556</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">epar;</ins></code></td> <td><ins class="diff-chg">U+022D5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">eparsl;</ins></code></td> <td><ins class="diff-chg">U+029E3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">eplus;</ins></code></td> <td><ins class="diff-chg">U+02A71</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">epsi;</ins></code></td> <td><ins class="diff-chg">U+003F5</ins></td> </tr> <tr> <td><code title="">epsilon;</code></td> <td><del class="diff-old">U+03B5</del> <ins class= "diff-chg">U+003B5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">epsiv;</ins></code></td> <td><ins class="diff-chg">U+003B5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">eqcirc;</ins></code></td> <td><ins class="diff-chg">U+02256</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">eqcolon;</ins></code></td> <td><ins class="diff-chg">U+02255</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">eqsim;</ins></code></td> <td><ins class="diff-chg">U+02242</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">eqslantgtr;</ins></code></td> <td><ins class="diff-chg">U+02A96</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">eqslantless;</ins></code></td> <td><ins class="diff-chg">U+02A95</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">equals;</ins></code></td> <td><ins class="diff-chg">U+0003D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">equest;</ins></code></td> <td><ins class="diff-chg">U+0225F</ins></td> </tr> <tr> <td><code title="">equiv;</code></td> <td><del class="diff-old">U+2261</del> <ins class= "diff-chg">U+02261</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">equivDD;</ins></code></td> <td><ins class="diff-chg">U+02A78</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">eqvparsl;</ins></code></td> <td><ins class="diff-chg">U+029E5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">erDot;</ins></code></td> <td><ins class="diff-chg">U+02253</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">erarr;</ins></code></td> <td><ins class="diff-chg">U+02971</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">escr;</ins></code></td> <td><ins class="diff-chg">U+0212F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">esdot;</ins></code></td> <td><ins class="diff-chg">U+02250</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">esim;</ins></code></td> <td><ins class="diff-chg">U+02242</ins></td> </tr> <tr> <td><code title="">eta;</code></td> <td><del class="diff-old">U+03B7</del> <ins class= "diff-chg">U+003B7</ins></td> </tr> <tr> <td><code title="">eth;</code></td> <td><del class="diff-old">U+00F0</del> <ins class= "diff-chg">U+000F0</ins></td> </tr> <tr> <td><code title="">eth</code></td> <td><del class="diff-old">U+00F0</del> <ins class= "diff-chg">U+000F0</ins></td> </tr> <tr> <td><code title="">euml;</code></td> <td><del class="diff-old">U+00EB</del> <ins class= "diff-chg">U+000EB</ins></td> </tr> <tr> <td><code title="">euml</code></td> <td><del class="diff-old">U+00EB</del> <ins class= "diff-chg">U+000EB</ins></td> </tr> <tr> <td><code title="">euro;</code></td> <td><del class="diff-old">U+20AC</del> <ins class= "diff-chg">U+020AC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">excl;</ins></code></td> <td><ins class="diff-chg">U+00021</ins></td> </tr> <tr> <td><code title="">exist;</code></td> <td><del class="diff-old">U+2203</del> <ins class= "diff-chg">U+02203</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">expectation;</ins></code></td> <td><ins class="diff-chg">U+02130</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">exponentiale;</ins></code></td> <td><ins class="diff-chg">U+02147</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">fallingdotseq;</ins></code></td> <td><ins class="diff-chg">U+02252</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">fcy;</ins></code></td> <td><ins class="diff-chg">U+00444</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">female;</ins></code></td> <td><ins class="diff-chg">U+02640</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ffilig;</ins></code></td> <td><ins class="diff-chg">U+0FB03</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">fflig;</ins></code></td> <td><ins class="diff-chg">U+0FB00</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ffllig;</ins></code></td> <td><ins class="diff-chg">U+0FB04</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ffr;</ins></code></td> <td><ins class="diff-chg">U+1D523</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">filig;</ins></code></td> <td><ins class="diff-chg">U+0FB01</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">flat;</ins></code></td> <td><ins class="diff-chg">U+0266D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">fllig;</ins></code></td> <td><ins class="diff-chg">U+0FB02</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">fltns;</ins></code></td> <td><ins class="diff-chg">U+025B1</ins></td> </tr> <tr> <td><code title="">fnof;</code></td> <td><del class="diff-old">U+0192</del> <ins class= "diff-chg">U+00192</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">fopf;</ins></code></td> <td><ins class="diff-chg">U+1D557</ins></td> </tr> <tr> <td><code title="">forall;</code></td> <td><del class="diff-old">U+2200</del> <ins class= "diff-chg">U+02200</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">fork;</ins></code></td> <td><ins class="diff-chg">U+022D4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">forkv;</ins></code></td> <td><ins class="diff-chg">U+02AD9</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">fpartint;</ins></code></td> <td><ins class="diff-chg">U+02A0D</ins></td> </tr> <tr> <td><code title="">frac12;</code></td> <td><del class="diff-old">U+00BD</del> <ins class= "diff-chg">U+000BD</ins></td> </tr> <tr> <td><code title="">frac12</code></td> <td><del class="diff-old">U+00BD</del> <ins class= "diff-chg">U+000BD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">frac13;</ins></code></td> <td><ins class="diff-chg">U+02153</ins></td> </tr> <tr> <td><code title="">frac14;</code></td> <td><del class="diff-old">U+00BC</del> <ins class= "diff-chg">U+000BC</ins></td> </tr> <tr> <td><code title="">frac14</code></td> <td><ins class="diff-new">U+000BC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-new">frac15;</ins></code></td> <td><del class="diff-old">U+00BC</del> <ins class= "diff-chg">U+02155</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">frac16;</ins></code></td> <td><ins class="diff-chg">U+02159</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">frac18;</ins></code></td> <td><ins class="diff-chg">U+0215B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">frac23;</ins></code></td> <td><ins class="diff-chg">U+02154</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">frac25;</ins></code></td> <td><ins class="diff-chg">U+02156</ins></td> </tr> <tr> <td><code title="">frac34;</code></td> <td><del class="diff-old">U+00BE</del> <ins class= "diff-chg">U+000BE</ins></td> </tr> <tr> <td><code title="">frac34</code></td> <td><del class="diff-old">U+00BE</del> <ins class= "diff-chg">U+000BE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">frac35;</ins></code></td> <td><ins class="diff-chg">U+02157</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">frac38;</ins></code></td> <td><ins class="diff-chg">U+0215C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">frac45;</ins></code></td> <td><ins class="diff-chg">U+02158</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">frac56;</ins></code></td> <td><ins class="diff-chg">U+0215A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">frac58;</ins></code></td> <td><ins class="diff-chg">U+0215D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">frac78;</ins></code></td> <td><ins class="diff-chg">U+0215E</ins></td> </tr> <tr> <td><code title="">frasl;</code></td> <td><del class="diff-old">U+2044</del> <ins class= "diff-chg">U+02044</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">frown;</ins></code></td> <td><ins class="diff-chg">U+02322</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">fscr;</ins></code></td> <td><ins class="diff-chg">U+1D4BB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gE;</ins></code></td> <td><ins class="diff-chg">U+02267</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gEl;</ins></code></td> <td><ins class="diff-chg">U+02A8C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gacute;</ins></code></td> <td><ins class="diff-chg">U+001F5</ins></td> </tr> <tr> <td><code title="">gamma;</code></td> <td><del class="diff-old">U+03B3</del> <ins class= "diff-chg">U+003B3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gammad;</ins></code></td> <td><ins class="diff-chg">U+003DD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gap;</ins></code></td> <td><ins class="diff-chg">U+02A86</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gbreve;</ins></code></td> <td><ins class="diff-chg">U+0011F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gcirc;</ins></code></td> <td><ins class="diff-chg">U+0011D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gcy;</ins></code></td> <td><ins class="diff-chg">U+00433</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gdot;</ins></code></td> <td><ins class="diff-chg">U+00121</ins></td> </tr> <tr> <td><code title="">ge;</code></td> <td><del class="diff-old">U+2265</del> <ins class= "diff-chg">U+02265</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gel;</ins></code></td> <td><ins class="diff-chg">U+022DB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">geq;</ins></code></td> <td><ins class="diff-chg">U+02265</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">geqq;</ins></code></td> <td><ins class="diff-chg">U+02267</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">geqslant;</ins></code></td> <td><ins class="diff-chg">U+02A7E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ges;</ins></code></td> <td><ins class="diff-chg">U+02A7E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gescc;</ins></code></td> <td><ins class="diff-chg">U+02AA9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gesdot;</ins></code></td> <td><ins class="diff-chg">U+02A80</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gesdoto;</ins></code></td> <td><ins class="diff-chg">U+02A82</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">gesdotol;</ins></code></td> <td><ins class="diff-chg">U+02A84</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gesles;</ins></code></td> <td><ins class="diff-chg">U+02A94</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gfr;</ins></code></td> <td><ins class="diff-chg">U+1D524</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gg;</ins></code></td> <td><ins class="diff-chg">U+0226B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ggg;</ins></code></td> <td><ins class="diff-chg">U+022D9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gimel;</ins></code></td> <td><ins class="diff-chg">U+02137</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gjcy;</ins></code></td> <td><ins class="diff-chg">U+00453</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gl;</ins></code></td> <td><ins class="diff-chg">U+02277</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">glE;</ins></code></td> <td><ins class="diff-chg">U+02A92</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gla;</ins></code></td> <td><ins class="diff-chg">U+02AA5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">glj;</ins></code></td> <td><ins class="diff-chg">U+02AA4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gnE;</ins></code></td> <td><ins class="diff-chg">U+02269</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gnap;</ins></code></td> <td><ins class="diff-chg">U+02A8A</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">gnapprox;</ins></code></td> <td><ins class="diff-chg">U+02A8A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gne;</ins></code></td> <td><ins class="diff-chg">U+02A88</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gneq;</ins></code></td> <td><ins class="diff-chg">U+02A88</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gneqq;</ins></code></td> <td><ins class="diff-chg">U+02269</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gnsim;</ins></code></td> <td><ins class="diff-chg">U+022E7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gopf;</ins></code></td> <td><ins class="diff-chg">U+1D558</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">grave;</ins></code></td> <td><ins class="diff-chg">U+00060</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gscr;</ins></code></td> <td><ins class="diff-chg">U+0210A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gsim;</ins></code></td> <td><ins class="diff-chg">U+02273</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gsime;</ins></code></td> <td><ins class="diff-chg">U+02A8E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gsiml;</ins></code></td> <td><ins class="diff-chg">U+02A90</ins></td> </tr> <tr> <td><code title="">gt;</code></td> <td><del class="diff-old">U+003E</del> <ins class= "diff-chg">U+0003E</ins></td> </tr> <tr> <td><code title="">gt</code></td> <td><del class="diff-old">U+003E</del> <ins class= "diff-chg">U+0003E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gtcc;</ins></code></td> <td><ins class="diff-chg">U+02AA7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gtcir;</ins></code></td> <td><ins class="diff-chg">U+02A7A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gtdot;</ins></code></td> <td><ins class="diff-chg">U+022D7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gtlPar;</ins></code></td> <td><ins class="diff-chg">U+02995</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gtquest;</ins></code></td> <td><ins class="diff-chg">U+02A7C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">gtrapprox;</ins></code></td> <td><ins class="diff-chg">U+02A86</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gtrarr;</ins></code></td> <td><ins class="diff-chg">U+02978</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gtrdot;</ins></code></td> <td><ins class="diff-chg">U+022D7</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">gtreqless;</ins></code></td> <td><ins class="diff-chg">U+022DB</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">gtreqqless;</ins></code></td> <td><ins class="diff-chg">U+02A8C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gtrless;</ins></code></td> <td><ins class="diff-chg">U+02277</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">gtrsim;</ins></code></td> <td><ins class="diff-chg">U+02273</ins></td> </tr> <tr> <td><code title="">hArr;</code></td> <td><del class="diff-old">U+21D4</del> <ins class= "diff-chg">U+021D4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hairsp;</ins></code></td> <td><ins class="diff-chg">U+0200A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">half;</ins></code></td> <td><ins class="diff-chg">U+000BD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hamilt;</ins></code></td> <td><ins class="diff-chg">U+0210B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hardcy;</ins></code></td> <td><ins class="diff-chg">U+0044A</ins></td> </tr> <tr> <td><code title="">harr;</code></td> <td><del class="diff-old">U+2194</del> <ins class= "diff-chg">U+02194</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">harrcir;</ins></code></td> <td><ins class="diff-chg">U+02948</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">harrw;</ins></code></td> <td><ins class="diff-chg">U+021AD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hbar;</ins></code></td> <td><ins class="diff-chg">U+0210F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hcirc;</ins></code></td> <td><ins class="diff-chg">U+00125</ins></td> </tr> <tr> <td><code title="">hearts;</code></td> <td><del class="diff-old">U+2665</del> <ins class= "diff-chg">U+02665</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">heartsuit;</ins></code></td> <td><ins class="diff-chg">U+02665</ins></td> </tr> <tr> <td><code title="">hellip;</code></td> <td><del class="diff-old">U+2026</del> <ins class= "diff-chg">U+02026</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hercon;</ins></code></td> <td><ins class="diff-chg">U+022B9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hfr;</ins></code></td> <td><ins class="diff-chg">U+1D525</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">hksearow;</ins></code></td> <td><ins class="diff-chg">U+02925</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">hkswarow;</ins></code></td> <td><ins class="diff-chg">U+02926</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hoarr;</ins></code></td> <td><ins class="diff-chg">U+021FF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">homtht;</ins></code></td> <td><ins class="diff-chg">U+0223B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">hookleftarrow;</ins></code></td> <td><ins class="diff-chg">U+021A9</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">hookrightarrow;</ins></code></td> <td><ins class="diff-chg">U+021AA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hopf;</ins></code></td> <td><ins class="diff-chg">U+1D559</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">horbar;</ins></code></td> <td><ins class="diff-chg">U+02015</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hscr;</ins></code></td> <td><ins class="diff-chg">U+1D4BD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hslash;</ins></code></td> <td><ins class="diff-chg">U+0210F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hstrok;</ins></code></td> <td><ins class="diff-chg">U+00127</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hybull;</ins></code></td> <td><ins class="diff-chg">U+02043</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">hyphen;</ins></code></td> <td><ins class="diff-chg">U+02010</ins></td> </tr> <tr> <td><code title="">iacute;</code></td> <td><del class="diff-old">U+00ED</del> <ins class= "diff-chg">U+000ED</ins></td> </tr> <tr> <td><code title="">iacute</code></td> <td><del class="diff-old">U+00ED</del> <ins class= "diff-chg">U+000ED</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ic;</ins></code></td> <td><ins class="diff-chg">U+02063</ins></td> </tr> <tr> <td><code title="">icirc;</code></td> <td><del class="diff-old">U+00EE</del> <ins class= "diff-chg">U+000EE</ins></td> </tr> <tr> <td><code title="">icirc</code></td> <td><del class="diff-old">U+00EE</del> <ins class= "diff-chg">U+000EE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">icy;</ins></code></td> <td><ins class="diff-chg">U+00438</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">iecy;</ins></code></td> <td><ins class="diff-chg">U+00435</ins></td> </tr> <tr> <td><code title="">iexcl;</code></td> <td><del class="diff-old">U+00A1</del> <ins class= "diff-chg">U+000A1</ins></td> </tr> <tr> <td><code title="">iexcl</code></td> <td><del class="diff-old">U+00A1</del> <ins class= "diff-chg">U+000A1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">iff;</ins></code></td> <td><ins class="diff-chg">U+021D4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ifr;</ins></code></td> <td><ins class="diff-chg">U+1D526</ins></td> </tr> <tr> <td><code title="">igrave;</code></td> <td><del class="diff-old">U+00EC</del> <ins class= "diff-chg">U+000EC</ins></td> </tr> <tr> <td><code title="">igrave</code></td> <td><del class="diff-old">U+00EC</del> <ins class= "diff-chg">U+000EC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ii;</ins></code></td> <td><ins class="diff-chg">U+02148</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">iiiint;</ins></code></td> <td><ins class="diff-chg">U+02A0C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">iiint;</ins></code></td> <td><ins class="diff-chg">U+0222D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">iinfin;</ins></code></td> <td><ins class="diff-chg">U+029DC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">iiota;</ins></code></td> <td><ins class="diff-chg">U+02129</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ijlig;</ins></code></td> <td><ins class="diff-chg">U+00133</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">imacr;</ins></code></td> <td><ins class="diff-chg">U+0012B</ins></td> </tr> <tr> <td><code title="">image;</code></td> <td><del class="diff-old">U+2111</del> <ins class= "diff-chg">U+02111</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">imagline;</ins></code></td> <td><ins class="diff-chg">U+02110</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">imagpart;</ins></code></td> <td><ins class="diff-chg">U+02111</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">imath;</ins></code></td> <td><ins class="diff-chg">U+00131</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">imof;</ins></code></td> <td><ins class="diff-chg">U+022B7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">imped;</ins></code></td> <td><ins class="diff-chg">U+001B5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">in;</ins></code></td> <td><ins class="diff-chg">U+02208</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">incare;</ins></code></td> <td><ins class="diff-chg">U+02105</ins></td> </tr> <tr> <td><code title="">infin;</code></td> <td><del class="diff-old">U+221E</del> <ins class= "diff-chg">U+0221E</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">infintie;</ins></code></td> <td><ins class="diff-chg">U+029DD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">inodot;</ins></code></td> <td><ins class="diff-chg">U+00131</ins></td> </tr> <tr> <td><code title="">int;</code></td> <td><del class="diff-old">U+222B</del> <ins class= "diff-chg">U+0222B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">intcal;</ins></code></td> <td><ins class="diff-chg">U+022BA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">integers;</ins></code></td> <td><ins class="diff-chg">U+02124</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">intercal;</ins></code></td> <td><ins class="diff-chg">U+022BA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">intlarhk;</ins></code></td> <td><ins class="diff-chg">U+02A17</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">intprod;</ins></code></td> <td><ins class="diff-chg">U+02A3C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">iocy;</ins></code></td> <td><ins class="diff-chg">U+00451</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">iogon;</ins></code></td> <td><ins class="diff-chg">U+0012F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">iopf;</ins></code></td> <td><ins class="diff-chg">U+1D55A</ins></td> </tr> <tr> <td><code title="">iota;</code></td> <td><del class="diff-old">U+03B9</del> <ins class= "diff-chg">U+003B9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">iprod;</ins></code></td> <td><ins class="diff-chg">U+02A3C</ins></td> </tr> <tr> <td><code title="">iquest;</code></td> <td><del class="diff-old">U+00BF</del> <ins class= "diff-chg">U+000BF</ins></td> </tr> <tr> <td><code title="">iquest</code></td> <td><del class="diff-old">U+00BF</del> <ins class= "diff-chg">U+000BF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">iscr;</ins></code></td> <td><ins class="diff-chg">U+1D4BE</ins></td> </tr> <tr> <td><code title="">isin;</code></td> <td><del class="diff-old">U+2208</del> <ins class= "diff-chg">U+02208</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">isinE;</ins></code></td> <td><ins class="diff-chg">U+022F9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">isindot;</ins></code></td> <td><ins class="diff-chg">U+022F5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">isins;</ins></code></td> <td><ins class="diff-chg">U+022F4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">isinsv;</ins></code></td> <td><ins class="diff-chg">U+022F3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">isinv;</ins></code></td> <td><ins class="diff-chg">U+02208</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">it;</ins></code></td> <td><ins class="diff-chg">U+02062</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">itilde;</ins></code></td> <td><ins class="diff-chg">U+00129</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">iukcy;</ins></code></td> <td><ins class="diff-chg">U+00456</ins></td> </tr> <tr> <td><code title="">iuml;</code></td> <td><del class="diff-old">U+00EF</del> <ins class= "diff-chg">U+000EF</ins></td> </tr> <tr> <td><code title="">iuml</code></td> <td><del class="diff-old">U+00EF</del> <ins class= "diff-chg">U+000EF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">jcirc;</ins></code></td> <td><ins class="diff-chg">U+00135</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">jcy;</ins></code></td> <td><ins class="diff-chg">U+00439</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">jfr;</ins></code></td> <td><ins class="diff-chg">U+1D527</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">jmath;</ins></code></td> <td><ins class="diff-chg">U+00237</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">jopf;</ins></code></td> <td><ins class="diff-chg">U+1D55B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">jscr;</ins></code></td> <td><ins class="diff-chg">U+1D4BF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">jsercy;</ins></code></td> <td><ins class="diff-chg">U+00458</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">jukcy;</ins></code></td> <td><ins class="diff-chg">U+00454</ins></td> </tr> <tr> <td><code title="">kappa;</code></td> <td><del class="diff-old">U+03BA</del> <ins class= "diff-chg">U+003BA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">kappav;</ins></code></td> <td><ins class="diff-chg">U+003F0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">kcedil;</ins></code></td> <td><ins class="diff-chg">U+00137</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">kcy;</ins></code></td> <td><ins class="diff-chg">U+0043A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">kfr;</ins></code></td> <td><ins class="diff-chg">U+1D528</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">kgreen;</ins></code></td> <td><ins class="diff-chg">U+00138</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">khcy;</ins></code></td> <td><ins class="diff-chg">U+00445</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">kjcy;</ins></code></td> <td><ins class="diff-chg">U+0045C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">kopf;</ins></code></td> <td><ins class="diff-chg">U+1D55C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">kscr;</ins></code></td> <td><ins class="diff-chg">U+1D4C0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lAarr;</ins></code></td> <td><ins class="diff-chg">U+021DA</ins></td> </tr> <tr> <td><code title="">lArr;</code></td> <td><del class="diff-old">U+21D0</del> <ins class= "diff-chg">U+021D0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lAtail;</ins></code></td> <td><ins class="diff-chg">U+0291B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lBarr;</ins></code></td> <td><ins class="diff-chg">U+0290E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lE;</ins></code></td> <td><ins class="diff-chg">U+02266</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lEg;</ins></code></td> <td><ins class="diff-chg">U+02A8B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lHar;</ins></code></td> <td><ins class="diff-chg">U+02962</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lacute;</ins></code></td> <td><ins class="diff-chg">U+0013A</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">laemptyv;</ins></code></td> <td><ins class="diff-chg">U+029B4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lagran;</ins></code></td> <td><ins class="diff-chg">U+02112</ins></td> </tr> <tr> <td><code title="">lambda;</code></td> <td><del class="diff-old">U+03BB</del> <ins class= "diff-chg">U+003BB</ins></td> </tr> <tr> <td><code title="">lang;</code></td> <td><del class="diff-old">U+3008</del> <ins class= "diff-chg">U+027E8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">langd;</ins></code></td> <td><ins class="diff-chg">U+02991</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">langle;</ins></code></td> <td><ins class="diff-chg">U+027E8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lap;</ins></code></td> <td><ins class="diff-chg">U+02A85</ins></td> </tr> <tr> <td><code title="">laquo;</code></td> <td><del class="diff-old">U+00AB</del> <ins class= "diff-chg">U+000AB</ins></td> </tr> <tr> <td><code title="">laquo</code></td> <td><del class="diff-old">U+00AB</del> <ins class= "diff-chg">U+000AB</ins></td> </tr> <tr> <td><code title="">larr;</code></td> <td><del class="diff-old">U+2190</del> <ins class= "diff-chg">U+02190</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">larrb;</ins></code></td> <td><ins class="diff-chg">U+021E4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">larrbfs;</ins></code></td> <td><ins class="diff-chg">U+0291F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">larrfs;</ins></code></td> <td><ins class="diff-chg">U+0291D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">larrhk;</ins></code></td> <td><ins class="diff-chg">U+021A9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">larrlp;</ins></code></td> <td><ins class="diff-chg">U+021AB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">larrpl;</ins></code></td> <td><ins class="diff-chg">U+02939</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">larrsim;</ins></code></td> <td><ins class="diff-chg">U+02973</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">larrtl;</ins></code></td> <td><ins class="diff-chg">U+021A2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lat;</ins></code></td> <td><ins class="diff-chg">U+02AAB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">latail;</ins></code></td> <td><ins class="diff-chg">U+02919</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">late;</ins></code></td> <td><ins class="diff-chg">U+02AAD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lbarr;</ins></code></td> <td><ins class="diff-chg">U+0290C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lbbrk;</ins></code></td> <td><ins class="diff-chg">U+02772</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lbrace;</ins></code></td> <td><ins class="diff-chg">U+0007B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lbrack;</ins></code></td> <td><ins class="diff-chg">U+0005B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lbrke;</ins></code></td> <td><ins class="diff-chg">U+0298B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lbrksld;</ins></code></td> <td><ins class="diff-chg">U+0298F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lbrkslu;</ins></code></td> <td><ins class="diff-chg">U+0298D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lcaron;</ins></code></td> <td><ins class="diff-chg">U+0013E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lcedil;</ins></code></td> <td><ins class="diff-chg">U+0013C</ins></td> </tr> <tr> <td><code title="">lceil;</code></td> <td><del class="diff-old">U+2308</del> <ins class= "diff-chg">U+02308</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lcub;</ins></code></td> <td><ins class="diff-chg">U+0007B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lcy;</ins></code></td> <td><ins class="diff-chg">U+0043B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ldca;</ins></code></td> <td><ins class="diff-chg">U+02936</ins></td> </tr> <tr> <td><code title="">ldquo;</code></td> <td><del class="diff-old">U+201C</del> <ins class= "diff-chg">U+0201C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ldquor;</ins></code></td> <td><ins class="diff-chg">U+0201E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ldrdhar;</ins></code></td> <td><ins class="diff-chg">U+02967</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ldrushar;</ins></code></td> <td><ins class="diff-chg">U+0294B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ldsh;</ins></code></td> <td><ins class="diff-chg">U+021B2</ins></td> </tr> <tr> <td><code title="">le;</code></td> <td><del class="diff-old">U+2264</del> <ins class= "diff-chg">U+02264</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">leftarrow;</ins></code></td> <td><ins class="diff-chg">U+02190</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">leftarrowtail;</ins></code></td> <td><ins class="diff-chg">U+021A2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">leftharpoondown;</ins></code></td> <td><ins class="diff-chg">U+021BD</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">leftharpoonup;</ins></code></td> <td><ins class="diff-chg">U+021BC</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">leftleftarrows;</ins></code></td> <td><ins class="diff-chg">U+021C7</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">leftrightarrow;</ins></code></td> <td><ins class="diff-chg">U+02194</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">leftrightarrows;</ins></code></td> <td><ins class="diff-chg">U+021C6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">leftrightharpoons;</ins></code></td> <td><ins class="diff-chg">U+021CB</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">leftrightsquigarrow;</ins></code></td> <td><ins class="diff-chg">U+021AD</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">leftthreetimes;</ins></code></td> <td><ins class="diff-chg">U+022CB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">leg;</ins></code></td> <td><ins class="diff-chg">U+022DA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">leq;</ins></code></td> <td><ins class="diff-chg">U+02264</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">leqq;</ins></code></td> <td><ins class="diff-chg">U+02266</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">leqslant;</ins></code></td> <td><ins class="diff-chg">U+02A7D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">les;</ins></code></td> <td><ins class="diff-chg">U+02A7D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lescc;</ins></code></td> <td><ins class="diff-chg">U+02AA8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lesdot;</ins></code></td> <td><ins class="diff-chg">U+02A7F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lesdoto;</ins></code></td> <td><ins class="diff-chg">U+02A81</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">lesdotor;</ins></code></td> <td><ins class="diff-chg">U+02A83</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lesges;</ins></code></td> <td><ins class="diff-chg">U+02A93</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">lessapprox;</ins></code></td> <td><ins class="diff-chg">U+02A85</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lessdot;</ins></code></td> <td><ins class="diff-chg">U+022D6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">lesseqgtr;</ins></code></td> <td><ins class="diff-chg">U+022DA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">lesseqqgtr;</ins></code></td> <td><ins class="diff-chg">U+02A8B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lessgtr;</ins></code></td> <td><ins class="diff-chg">U+02276</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lesssim;</ins></code></td> <td><ins class="diff-chg">U+02272</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lfisht;</ins></code></td> <td><ins class="diff-chg">U+0297C</ins></td> </tr> <tr> <td><code title="">lfloor;</code></td> <td><del class="diff-old">U+230A</del> <ins class= "diff-chg">U+0230A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lfr;</ins></code></td> <td><ins class="diff-chg">U+1D529</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lg;</ins></code></td> <td><ins class="diff-chg">U+02276</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lgE;</ins></code></td> <td><ins class="diff-chg">U+02A91</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lhard;</ins></code></td> <td><ins class="diff-chg">U+021BD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lharu;</ins></code></td> <td><ins class="diff-chg">U+021BC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lharul;</ins></code></td> <td><ins class="diff-chg">U+0296A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lhblk;</ins></code></td> <td><ins class="diff-chg">U+02584</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ljcy;</ins></code></td> <td><ins class="diff-chg">U+00459</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ll;</ins></code></td> <td><ins class="diff-chg">U+0226A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">llarr;</ins></code></td> <td><ins class="diff-chg">U+021C7</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">llcorner;</ins></code></td> <td><ins class="diff-chg">U+0231E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">llhard;</ins></code></td> <td><ins class="diff-chg">U+0296B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lltri;</ins></code></td> <td><ins class="diff-chg">U+025FA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lmidot;</ins></code></td> <td><ins class="diff-chg">U+00140</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lmoust;</ins></code></td> <td><ins class="diff-chg">U+023B0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">lmoustache;</ins></code></td> <td><ins class="diff-chg">U+023B0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lnE;</ins></code></td> <td><ins class="diff-chg">U+02268</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lnap;</ins></code></td> <td><ins class="diff-chg">U+02A89</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">lnapprox;</ins></code></td> <td><ins class="diff-chg">U+02A89</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lne;</ins></code></td> <td><ins class="diff-chg">U+02A87</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lneq;</ins></code></td> <td><ins class="diff-chg">U+02A87</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lneqq;</ins></code></td> <td><ins class="diff-chg">U+02268</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lnsim;</ins></code></td> <td><ins class="diff-chg">U+022E6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">loang;</ins></code></td> <td><ins class="diff-chg">U+027EC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">loarr;</ins></code></td> <td><ins class="diff-chg">U+021FD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lobrk;</ins></code></td> <td><ins class="diff-chg">U+027E6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">longleftarrow;</ins></code></td> <td><ins class="diff-chg">U+027F5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">longleftrightarrow;</ins></code></td> <td><ins class="diff-chg">U+027F7</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">longmapsto;</ins></code></td> <td><ins class="diff-chg">U+027FC</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">longrightarrow;</ins></code></td> <td><ins class="diff-chg">U+027F6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">looparrowleft;</ins></code></td> <td><ins class="diff-chg">U+021AB</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">looparrowright;</ins></code></td> <td><ins class="diff-chg">U+021AC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lopar;</ins></code></td> <td><ins class="diff-chg">U+02985</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lopf;</ins></code></td> <td><ins class="diff-chg">U+1D55D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">loplus;</ins></code></td> <td><ins class="diff-chg">U+02A2D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lotimes;</ins></code></td> <td><ins class="diff-chg">U+02A34</ins></td> </tr> <tr> <td><code title="">lowast;</code></td> <td><del class="diff-old">U+2217</del> <ins class= "diff-chg">U+02217</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lowbar;</ins></code></td> <td><ins class="diff-chg">U+0005F</ins></td> </tr> <tr> <td><code title="">loz;</code></td> <td><del class="diff-old">U+25CA</del> <ins class= "diff-chg">U+025CA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lozenge;</ins></code></td> <td><ins class="diff-chg">U+025CA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lozf;</ins></code></td> <td><ins class="diff-chg">U+029EB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lpar;</ins></code></td> <td><ins class="diff-chg">U+00028</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lparlt;</ins></code></td> <td><ins class="diff-chg">U+02993</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lrarr;</ins></code></td> <td><ins class="diff-chg">U+021C6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">lrcorner;</ins></code></td> <td><ins class="diff-chg">U+0231F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lrhar;</ins></code></td> <td><ins class="diff-chg">U+021CB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lrhard;</ins></code></td> <td><ins class="diff-chg">U+0296D</ins></td> </tr> <tr> <td><code title="">lrm;</code></td> <td><del class="diff-old">U+200E</del> <ins class= "diff-chg">U+0200E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lrtri;</ins></code></td> <td><ins class="diff-chg">U+022BF</ins></td> </tr> <tr> <td><code title="">lsaquo;</code></td> <td><del class="diff-old">U+2039</del> <ins class= "diff-chg">U+02039</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lscr;</ins></code></td> <td><ins class="diff-chg">U+1D4C1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lsh;</ins></code></td> <td><ins class="diff-chg">U+021B0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lsim;</ins></code></td> <td><ins class="diff-chg">U+02272</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lsime;</ins></code></td> <td><ins class="diff-chg">U+02A8D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lsimg;</ins></code></td> <td><ins class="diff-chg">U+02A8F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lsqb;</ins></code></td> <td><ins class="diff-chg">U+0005B</ins></td> </tr> <tr> <td><code title="">lsquo;</code></td> <td><del class="diff-old">U+2018</del> <ins class= "diff-chg">U+02018</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lsquor;</ins></code></td> <td><ins class="diff-chg">U+0201A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lstrok;</ins></code></td> <td><ins class="diff-chg">U+00142</ins></td> </tr> <tr> <td><code title="">lt;</code></td> <td><del class="diff-old">U+003C</del> <ins class= "diff-chg">U+0003C</ins></td> </tr> <tr> <td><code title="">lt</code></td> <td><del class="diff-old">U+003C</del> <ins class= "diff-chg">U+0003C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ltcc;</ins></code></td> <td><ins class="diff-chg">U+02AA6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ltcir;</ins></code></td> <td><ins class="diff-chg">U+02A79</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ltdot;</ins></code></td> <td><ins class="diff-chg">U+022D6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">lthree;</ins></code></td> <td><ins class="diff-chg">U+022CB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ltimes;</ins></code></td> <td><ins class="diff-chg">U+022C9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ltlarr;</ins></code></td> <td><ins class="diff-chg">U+02976</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ltquest;</ins></code></td> <td><ins class="diff-chg">U+02A7B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ltrPar;</ins></code></td> <td><ins class="diff-chg">U+02996</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ltri;</ins></code></td> <td><ins class="diff-chg">U+025C3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ltrie;</ins></code></td> <td><ins class="diff-chg">U+022B4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ltrif;</ins></code></td> <td><ins class="diff-chg">U+025C2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">lurdshar;</ins></code></td> <td><ins class="diff-chg">U+0294A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">luruhar;</ins></code></td> <td><ins class="diff-chg">U+02966</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mDDot;</ins></code></td> <td><ins class="diff-chg">U+0223A</ins></td> </tr> <tr> <td><code title="">macr;</code></td> <td><del class="diff-old">U+00AF</del> <ins class= "diff-chg">U+000AF</ins></td> </tr> <tr> <td><code title="">macr</code></td> <td><del class="diff-old">U+00AF</del> <ins class= "diff-chg">U+000AF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">male;</ins></code></td> <td><ins class="diff-chg">U+02642</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">malt;</ins></code></td> <td><ins class="diff-chg">U+02720</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">maltese;</ins></code></td> <td><ins class="diff-chg">U+02720</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">map;</ins></code></td> <td><ins class="diff-chg">U+021A6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mapsto;</ins></code></td> <td><ins class="diff-chg">U+021A6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">mapstodown;</ins></code></td> <td><ins class="diff-chg">U+021A7</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">mapstoleft;</ins></code></td> <td><ins class="diff-chg">U+021A4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">mapstoup;</ins></code></td> <td><ins class="diff-chg">U+021A5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">marker;</ins></code></td> <td><ins class="diff-chg">U+025AE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mcomma;</ins></code></td> <td><ins class="diff-chg">U+02A29</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mcy;</ins></code></td> <td><ins class="diff-chg">U+0043C</ins></td> </tr> <tr> <td><code title="">mdash;</code></td> <td><del class="diff-old">U+2014</del> <ins class= "diff-chg">U+02014</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">measuredangle;</ins></code></td> <td><ins class="diff-chg">U+02221</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mfr;</ins></code></td> <td><ins class="diff-chg">U+1D52A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mho;</ins></code></td> <td><ins class="diff-chg">U+02127</ins></td> </tr> <tr> <td><code title="">micro;</code></td> <td><del class="diff-old">U+00B5</del> <ins class= "diff-chg">U+000B5</ins></td> </tr> <tr> <td><code title="">micro</code></td> <td><del class="diff-old">U+00B5</del> <ins class= "diff-chg">U+000B5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mid;</ins></code></td> <td><ins class="diff-chg">U+02223</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">midast;</ins></code></td> <td><ins class="diff-chg">U+0002A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">midcir;</ins></code></td> <td><ins class="diff-chg">U+02AF0</ins></td> </tr> <tr> <td><code title="">middot;</code></td> <td><del class="diff-old">U+00B7</del> <ins class= "diff-chg">U+000B7</ins></td> </tr> <tr> <td><code title="">middot</code></td> <td><del class="diff-old">U+00B7</del> <ins class= "diff-chg">U+000B7</ins></td> </tr> <tr> <td><code title="">minus;</code></td> <td><del class="diff-old">U+2212</del> <ins class= "diff-chg">U+02212</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">minusb;</ins></code></td> <td><ins class="diff-chg">U+0229F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">minusd;</ins></code></td> <td><ins class="diff-chg">U+02238</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">minusdu;</ins></code></td> <td><ins class="diff-chg">U+02A2A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mlcp;</ins></code></td> <td><ins class="diff-chg">U+02ADB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mldr;</ins></code></td> <td><ins class="diff-chg">U+02026</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mnplus;</ins></code></td> <td><ins class="diff-chg">U+02213</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">models;</ins></code></td> <td><ins class="diff-chg">U+022A7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mopf;</ins></code></td> <td><ins class="diff-chg">U+1D55E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mp;</ins></code></td> <td><ins class="diff-chg">U+02213</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mscr;</ins></code></td> <td><ins class="diff-chg">U+1D4C2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mstpos;</ins></code></td> <td><ins class="diff-chg">U+0223E</ins></td> </tr> <tr> <td><code title="">mu;</code></td> <td><del class="diff-old">U+03BC</del> <ins class= "diff-chg">U+003BC</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">multimap;</ins></code></td> <td><ins class="diff-chg">U+022B8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">mumap;</ins></code></td> <td><ins class="diff-chg">U+022B8</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">nLeftarrow;</ins></code></td> <td><ins class="diff-chg">U+021CD</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">nLeftrightarrow;</ins></code></td> <td><ins class="diff-chg">U+021CE</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">nRightarrow;</ins></code></td> <td><ins class="diff-chg">U+021CF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nVDash;</ins></code></td> <td><ins class="diff-chg">U+022AF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nVdash;</ins></code></td> <td><ins class="diff-chg">U+022AE</ins></td> </tr> <tr> <td><code title="">nabla;</code></td> <td><del class="diff-old">U+2207</del> <ins class= "diff-chg">U+02207</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nacute;</ins></code></td> <td><ins class="diff-chg">U+00144</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nap;</ins></code></td> <td><ins class="diff-chg">U+02249</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">napos;</ins></code></td> <td><ins class="diff-chg">U+00149</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">napprox;</ins></code></td> <td><ins class="diff-chg">U+02249</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">natur;</ins></code></td> <td><ins class="diff-chg">U+0266E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">natural;</ins></code></td> <td><ins class="diff-chg">U+0266E</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">naturals;</ins></code></td> <td><ins class="diff-chg">U+02115</ins></td> </tr> <tr> <td><code title="">nbsp;</code></td> <td><del class="diff-old">U+00A0</del> <ins class= "diff-chg">U+000A0</ins></td> </tr> <tr> <td><code title="">nbsp</code></td> <td><del class="diff-old">U+00A0</del> <ins class= "diff-chg">U+000A0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ncap;</ins></code></td> <td><ins class="diff-chg">U+02A43</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ncaron;</ins></code></td> <td><ins class="diff-chg">U+00148</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ncedil;</ins></code></td> <td><ins class="diff-chg">U+00146</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ncong;</ins></code></td> <td><ins class="diff-chg">U+02247</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ncup;</ins></code></td> <td><ins class="diff-chg">U+02A42</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ncy;</ins></code></td> <td><ins class="diff-chg">U+0043D</ins></td> </tr> <tr> <td><code title="">ndash;</code></td> <td><del class="diff-old">U+2013</del> <ins class= "diff-chg">U+02013</ins></td> </tr> <tr> <td><code title="">ne;</code></td> <td><del class="diff-old">U+2260</del> <ins class= "diff-chg">U+02260</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">neArr;</ins></code></td> <td><ins class="diff-chg">U+021D7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nearhk;</ins></code></td> <td><ins class="diff-chg">U+02924</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nearr;</ins></code></td> <td><ins class="diff-chg">U+02197</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nearrow;</ins></code></td> <td><ins class="diff-chg">U+02197</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nequiv;</ins></code></td> <td><ins class="diff-chg">U+02262</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nesear;</ins></code></td> <td><ins class="diff-chg">U+02928</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nexist;</ins></code></td> <td><ins class="diff-chg">U+02204</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nexists;</ins></code></td> <td><ins class="diff-chg">U+02204</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nfr;</ins></code></td> <td><ins class="diff-chg">U+1D52B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nge;</ins></code></td> <td><ins class="diff-chg">U+02271</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ngeq;</ins></code></td> <td><ins class="diff-chg">U+02271</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ngsim;</ins></code></td> <td><ins class="diff-chg">U+02275</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ngt;</ins></code></td> <td><ins class="diff-chg">U+0226F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ngtr;</ins></code></td> <td><ins class="diff-chg">U+0226F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nhArr;</ins></code></td> <td><ins class="diff-chg">U+021CE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nharr;</ins></code></td> <td><ins class="diff-chg">U+021AE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nhpar;</ins></code></td> <td><ins class="diff-chg">U+02AF2</ins></td> </tr> <tr> <td><code title="">ni;</code></td> <td><del class="diff-old">U+220B</del> <ins class= "diff-chg">U+0220B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nis;</ins></code></td> <td><ins class="diff-chg">U+022FC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nisd;</ins></code></td> <td><ins class="diff-chg">U+022FA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">niv;</ins></code></td> <td><ins class="diff-chg">U+0220B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">njcy;</ins></code></td> <td><ins class="diff-chg">U+0045A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nlArr;</ins></code></td> <td><ins class="diff-chg">U+021CD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nlarr;</ins></code></td> <td><ins class="diff-chg">U+0219A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nldr;</ins></code></td> <td><ins class="diff-chg">U+02025</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nle;</ins></code></td> <td><ins class="diff-chg">U+02270</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">nleftarrow;</ins></code></td> <td><ins class="diff-chg">U+0219A</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">nleftrightarrow;</ins></code></td> <td><ins class="diff-chg">U+021AE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nleq;</ins></code></td> <td><ins class="diff-chg">U+02270</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nless;</ins></code></td> <td><ins class="diff-chg">U+0226E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nlsim;</ins></code></td> <td><ins class="diff-chg">U+02274</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nlt;</ins></code></td> <td><ins class="diff-chg">U+0226E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nltri;</ins></code></td> <td><ins class="diff-chg">U+022EA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nltrie;</ins></code></td> <td><ins class="diff-chg">U+022EC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nmid;</ins></code></td> <td><ins class="diff-chg">U+02224</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nopf;</ins></code></td> <td><ins class="diff-chg">U+1D55F</ins></td> </tr> <tr> <td><code title="">not;</code></td> <td><del class="diff-old">U+00AC</del> <ins class= "diff-chg">U+000AC</ins></td> </tr> <tr> <td><code title="">not</code></td> <td><del class="diff-old">U+00AC</del> <ins class= "diff-chg">U+000AC</ins></td> </tr> <tr> <td><code title="">notin;</code></td> <td><del class="diff-old">U+2209</del> <ins class= "diff-chg">U+02209</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">notinva;</ins></code></td> <td><ins class="diff-chg">U+02209</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">notinvb;</ins></code></td> <td><ins class="diff-chg">U+022F7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">notinvc;</ins></code></td> <td><ins class="diff-chg">U+022F6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">notni;</ins></code></td> <td><ins class="diff-chg">U+0220C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">notniva;</ins></code></td> <td><ins class="diff-chg">U+0220C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">notnivb;</ins></code></td> <td><ins class="diff-chg">U+022FE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">notnivc;</ins></code></td> <td><ins class="diff-chg">U+022FD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">npar;</ins></code></td> <td><ins class="diff-chg">U+02226</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">nparallel;</ins></code></td> <td><ins class="diff-chg">U+02226</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">npolint;</ins></code></td> <td><ins class="diff-chg">U+02A14</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">npr;</ins></code></td> <td><ins class="diff-chg">U+02280</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nprcue;</ins></code></td> <td><ins class="diff-chg">U+022E0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nprec;</ins></code></td> <td><ins class="diff-chg">U+02280</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nrArr;</ins></code></td> <td><ins class="diff-chg">U+021CF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nrarr;</ins></code></td> <td><ins class="diff-chg">U+0219B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">nrightarrow;</ins></code></td> <td><ins class="diff-chg">U+0219B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nrtri;</ins></code></td> <td><ins class="diff-chg">U+022EB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nrtrie;</ins></code></td> <td><ins class="diff-chg">U+022ED</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nsc;</ins></code></td> <td><ins class="diff-chg">U+02281</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nsccue;</ins></code></td> <td><ins class="diff-chg">U+022E1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nscr;</ins></code></td> <td><ins class="diff-chg">U+1D4C3</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">nshortmid;</ins></code></td> <td><ins class="diff-chg">U+02224</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">nshortparallel;</ins></code></td> <td><ins class="diff-chg">U+02226</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nsim;</ins></code></td> <td><ins class="diff-chg">U+02241</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nsime;</ins></code></td> <td><ins class="diff-chg">U+02244</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nsimeq;</ins></code></td> <td><ins class="diff-chg">U+02244</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nsmid;</ins></code></td> <td><ins class="diff-chg">U+02224</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nspar;</ins></code></td> <td><ins class="diff-chg">U+02226</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nsqsube;</ins></code></td> <td><ins class="diff-chg">U+022E2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nsqsupe;</ins></code></td> <td><ins class="diff-chg">U+022E3</ins></td> </tr> <tr> <td><code title="">nsub;</code></td> <td><del class="diff-old">U+2284</del> <ins class= "diff-chg">U+02284</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nsube;</ins></code></td> <td><ins class="diff-chg">U+02288</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">nsubseteq;</ins></code></td> <td><ins class="diff-chg">U+02288</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nsucc;</ins></code></td> <td><ins class="diff-chg">U+02281</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nsup;</ins></code></td> <td><ins class="diff-chg">U+02285</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nsupe;</ins></code></td> <td><ins class="diff-chg">U+02289</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">nsupseteq;</ins></code></td> <td><ins class="diff-chg">U+02289</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ntgl;</ins></code></td> <td><ins class="diff-chg">U+02279</ins></td> </tr> <tr> <td><code title="">ntilde;</code></td> <td><del class="diff-old">U+00F1</del> <ins class= "diff-chg">U+000F1</ins></td> </tr> <tr> <td><code title="">ntilde</code></td> <td><del class="diff-old">U+00F1</del> <ins class= "diff-chg">U+000F1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ntlg;</ins></code></td> <td><ins class="diff-chg">U+02278</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ntriangleleft;</ins></code></td> <td><ins class="diff-chg">U+022EA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ntrianglelefteq;</ins></code></td> <td><ins class="diff-chg">U+022EC</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ntriangleright;</ins></code></td> <td><ins class="diff-chg">U+022EB</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ntrianglerighteq;</ins></code></td> <td><ins class="diff-chg">U+022ED</ins></td> </tr> <tr> <td><code title="">nu;</code></td> <td><del class="diff-old">U+03BD</del> <ins class= "diff-chg">U+003BD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">num;</ins></code></td> <td><ins class="diff-chg">U+00023</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">numero;</ins></code></td> <td><ins class="diff-chg">U+02116</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">numsp;</ins></code></td> <td><ins class="diff-chg">U+02007</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nvDash;</ins></code></td> <td><ins class="diff-chg">U+022AD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nvHarr;</ins></code></td> <td><ins class="diff-chg">U+02904</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nvdash;</ins></code></td> <td><ins class="diff-chg">U+022AC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nvinfin;</ins></code></td> <td><ins class="diff-chg">U+029DE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nvlArr;</ins></code></td> <td><ins class="diff-chg">U+02902</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nvrArr;</ins></code></td> <td><ins class="diff-chg">U+02903</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nwArr;</ins></code></td> <td><ins class="diff-chg">U+021D6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nwarhk;</ins></code></td> <td><ins class="diff-chg">U+02923</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nwarr;</ins></code></td> <td><ins class="diff-chg">U+02196</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nwarrow;</ins></code></td> <td><ins class="diff-chg">U+02196</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">nwnear;</ins></code></td> <td><ins class="diff-chg">U+02927</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">oS;</ins></code></td> <td><ins class="diff-chg">U+024C8</ins></td> </tr> <tr> <td><code title="">oacute;</code></td> <td><del class="diff-old">U+00F3</del> <ins class= "diff-chg">U+000F3</ins></td> </tr> <tr> <td><code title="">oacute</code></td> <td><del class="diff-old">U+00F3</del> <ins class= "diff-chg">U+000F3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">oast;</ins></code></td> <td><ins class="diff-chg">U+0229B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ocir;</ins></code></td> <td><ins class="diff-chg">U+0229A</ins></td> </tr> <tr> <td><code title="">ocirc;</code></td> <td><del class="diff-old">U+00F4</del> <ins class= "diff-chg">U+000F4</ins></td> </tr> <tr> <td><code title="">ocirc</code></td> <td><ins class="diff-new">U+000F4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-new">ocy;</ins></code></td> <td><del class="diff-old">U+00F4</del> <ins class= "diff-chg">U+0043E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">odash;</ins></code></td> <td><ins class="diff-chg">U+0229D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">odblac;</ins></code></td> <td><ins class="diff-chg">U+00151</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">odiv;</ins></code></td> <td><ins class="diff-chg">U+02A38</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">odot;</ins></code></td> <td><ins class="diff-chg">U+02299</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">odsold;</ins></code></td> <td><ins class="diff-chg">U+029BC</ins></td> </tr> <tr> <td><code title="">oelig;</code></td> <td><del class="diff-old">U+0153</del> <ins class= "diff-chg">U+00153</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ofcir;</ins></code></td> <td><ins class="diff-chg">U+029BF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ofr;</ins></code></td> <td><ins class="diff-chg">U+1D52C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ogon;</ins></code></td> <td><ins class="diff-chg">U+002DB</ins></td> </tr> <tr> <td><code title="">ograve;</code></td> <td><del class="diff-old">U+00F2</del> <ins class= "diff-chg">U+000F2</ins></td> </tr> <tr> <td><code title="">ograve</code></td> <td><del class="diff-old">U+00F2</del> <ins class= "diff-chg">U+000F2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ogt;</ins></code></td> <td><ins class="diff-chg">U+029C1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ohbar;</ins></code></td> <td><ins class="diff-chg">U+029B5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ohm;</ins></code></td> <td><ins class="diff-chg">U+02126</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">oint;</ins></code></td> <td><ins class="diff-chg">U+0222E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">olarr;</ins></code></td> <td><ins class="diff-chg">U+021BA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">olcir;</ins></code></td> <td><ins class="diff-chg">U+029BE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">olcross;</ins></code></td> <td><ins class="diff-chg">U+029BB</ins></td> </tr> <tr> <td><code title="">oline;</code></td> <td><del class="diff-old">U+203E</del> <ins class= "diff-chg">U+0203E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">olt;</ins></code></td> <td><ins class="diff-chg">U+029C0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">omacr;</ins></code></td> <td><ins class="diff-chg">U+0014D</ins></td> </tr> <tr> <td><code title="">omega;</code></td> <td><del class="diff-old">U+03C9</del> <ins class= "diff-chg">U+003C9</ins></td> </tr> <tr> <td><code title="">omicron;</code></td> <td><del class="diff-old">U+03BF</del> <ins class= "diff-chg">U+003BF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">omid;</ins></code></td> <td><ins class="diff-chg">U+029B6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ominus;</ins></code></td> <td><ins class="diff-chg">U+02296</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">oopf;</ins></code></td> <td><ins class="diff-chg">U+1D560</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">opar;</ins></code></td> <td><ins class="diff-chg">U+029B7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">operp;</ins></code></td> <td><ins class="diff-chg">U+029B9</ins></td> </tr> <tr> <td><code title="">oplus;</code></td> <td><del class="diff-old">U+2295</del> <ins class= "diff-chg">U+02295</ins></td> </tr> <tr> <td><code title="">or;</code></td> <td><del class="diff-old">U+2228</del> <ins class= "diff-chg">U+02228</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">orarr;</ins></code></td> <td><ins class="diff-chg">U+021BB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ord;</ins></code></td> <td><ins class="diff-chg">U+02A5D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">order;</ins></code></td> <td><ins class="diff-chg">U+02134</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">orderof;</ins></code></td> <td><ins class="diff-chg">U+02134</ins></td> </tr> <tr> <td><code title="">ordf;</code></td> <td><del class="diff-old">U+00AA</del> <ins class= "diff-chg">U+000AA</ins></td> </tr> <tr> <td><code title="">ordf</code></td> <td><del class="diff-old">U+00AA</del> <ins class= "diff-chg">U+000AA</ins></td> </tr> <tr> <td><code title="">ordm;</code></td> <td><del class="diff-old">U+00BA</del> <ins class= "diff-chg">U+000BA</ins></td> </tr> <tr> <td><code title="">ordm</code></td> <td><del class="diff-old">U+00BA</del> <ins class= "diff-chg">U+000BA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">origof;</ins></code></td> <td><ins class="diff-chg">U+022B6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">oror;</ins></code></td> <td><ins class="diff-chg">U+02A56</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">orslope;</ins></code></td> <td><ins class="diff-chg">U+02A57</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">orv;</ins></code></td> <td><ins class="diff-chg">U+02A5B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">oscr;</ins></code></td> <td><ins class="diff-chg">U+02134</ins></td> </tr> <tr> <td><code title="">oslash;</code></td> <td><del class="diff-old">U+00F8</del> <ins class= "diff-chg">U+000F8</ins></td> </tr> <tr> <td><code title="">oslash</code></td> <td><del class="diff-old">U+00F8</del> <ins class= "diff-chg">U+000F8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">osol;</ins></code></td> <td><ins class="diff-chg">U+02298</ins></td> </tr> <tr> <td><code title="">otilde;</code></td> <td><del class="diff-old">U+00F5</del> <ins class= "diff-chg">U+000F5</ins></td> </tr> <tr> <td><code title="">otilde</code></td> <td><del class="diff-old">U+00F5</del> <ins class= "diff-chg">U+000F5</ins></td> </tr> <tr> <td><code title="">otimes;</code></td> <td><del class="diff-old">U+2297</del> <ins class= "diff-chg">U+02297</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">otimesas;</ins></code></td> <td><ins class="diff-chg">U+02A36</ins></td> </tr> <tr> <td><code title="">ouml;</code></td> <td><del class="diff-old">U+00F6</del> <ins class= "diff-chg">U+000F6</ins></td> </tr> <tr> <td><code title="">ouml</code></td> <td><del class="diff-old">U+00F6</del> <ins class= "diff-chg">U+000F6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ovbar;</ins></code></td> <td><ins class="diff-chg">U+0233D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">par;</ins></code></td> <td><ins class="diff-chg">U+02225</ins></td> </tr> <tr> <td><code title="">para;</code></td> <td><del class="diff-old">U+00B6</del> <ins class= "diff-chg">U+000B6</ins></td> </tr> <tr> <td><code title="">para</code></td> <td><del class="diff-old">U+00B6</del> <ins class= "diff-chg">U+000B6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">parallel;</ins></code></td> <td><ins class="diff-chg">U+02225</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">parsim;</ins></code></td> <td><ins class="diff-chg">U+02AF3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">parsl;</ins></code></td> <td><ins class="diff-chg">U+02AFD</ins></td> </tr> <tr> <td><code title="">part;</code></td> <td><del class="diff-old">U+2202</del> <ins class= "diff-chg">U+02202</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">pcy;</ins></code></td> <td><ins class="diff-chg">U+0043F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">percnt;</ins></code></td> <td><ins class="diff-chg">U+00025</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">period;</ins></code></td> <td><ins class="diff-chg">U+0002E</ins></td> </tr> <tr> <td><code title="">permil;</code></td> <td><del class="diff-old">U+2030</del> <ins class= "diff-chg">U+02030</ins></td> </tr> <tr> <td><code title="">perp;</code></td> <td><del class="diff-old">U+22A5</del> <ins class= "diff-chg">U+022A5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">pertenk;</ins></code></td> <td><ins class="diff-chg">U+02031</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">pfr;</ins></code></td> <td><ins class="diff-chg">U+1D52D</ins></td> </tr> <tr> <td><code title="">phi;</code></td> <td><del class="diff-old">U+03C6</del> <ins class= "diff-chg">U+003C6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">phiv;</ins></code></td> <td><ins class="diff-chg">U+003C6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">phmmat;</ins></code></td> <td><ins class="diff-chg">U+02133</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">phone;</ins></code></td> <td><ins class="diff-chg">U+0260E</ins></td> </tr> <tr> <td><code title="">pi;</code></td> <td><del class="diff-old">U+03C0</del> <ins class= "diff-chg">U+003C0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">pitchfork;</ins></code></td> <td><ins class="diff-chg">U+022D4</ins></td> </tr> <tr> <td><code title="">piv;</code></td> <td><del class="diff-old">U+03D6</del> <ins class= "diff-chg">U+003D6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">planck;</ins></code></td> <td><ins class="diff-chg">U+0210F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">planckh;</ins></code></td> <td><ins class="diff-chg">U+0210E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">plankv;</ins></code></td> <td><ins class="diff-chg">U+0210F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">plus;</ins></code></td> <td><ins class="diff-chg">U+0002B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">plusacir;</ins></code></td> <td><ins class="diff-chg">U+02A23</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">plusb;</ins></code></td> <td><ins class="diff-chg">U+0229E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">pluscir;</ins></code></td> <td><ins class="diff-chg">U+02A22</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">plusdo;</ins></code></td> <td><ins class="diff-chg">U+02214</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">plusdu;</ins></code></td> <td><ins class="diff-chg">U+02A25</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">pluse;</ins></code></td> <td><ins class="diff-chg">U+02A72</ins></td> </tr> <tr> <td><code title="">plusmn;</code></td> <td><del class="diff-old">U+00B1</del> <ins class= "diff-chg">U+000B1</ins></td> </tr> <tr> <td><code title="">plusmn</code></td> <td><del class="diff-old">U+00B1</del> <ins class= "diff-chg">U+000B1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">plussim;</ins></code></td> <td><ins class="diff-chg">U+02A26</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">plustwo;</ins></code></td> <td><ins class="diff-chg">U+02A27</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">pm;</ins></code></td> <td><ins class="diff-chg">U+000B1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">pointint;</ins></code></td> <td><ins class="diff-chg">U+02A15</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">popf;</ins></code></td> <td><ins class="diff-chg">U+1D561</ins></td> </tr> <tr> <td><code title="">pound;</code></td> <td><del class="diff-old">U+00A3</del> <ins class= "diff-chg">U+000A3</ins></td> </tr> <tr> <td><code title="">pound</code></td> <td><del class="diff-old">U+00A3</del> <ins class= "diff-chg">U+000A3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">pr;</ins></code></td> <td><ins class="diff-chg">U+0227A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">prE;</ins></code></td> <td><ins class="diff-chg">U+02AB3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">prap;</ins></code></td> <td><ins class="diff-chg">U+02AB7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">prcue;</ins></code></td> <td><ins class="diff-chg">U+0227C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">pre;</ins></code></td> <td><ins class="diff-chg">U+02AAF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">prec;</ins></code></td> <td><ins class="diff-chg">U+0227A</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">precapprox;</ins></code></td> <td><ins class="diff-chg">U+02AB7</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">preccurlyeq;</ins></code></td> <td><ins class="diff-chg">U+0227C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">preceq;</ins></code></td> <td><ins class="diff-chg">U+02AAF</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">precnapprox;</ins></code></td> <td><ins class="diff-chg">U+02AB9</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">precneqq;</ins></code></td> <td><ins class="diff-chg">U+02AB5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">precnsim;</ins></code></td> <td><ins class="diff-chg">U+022E8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">precsim;</ins></code></td> <td><ins class="diff-chg">U+0227E</ins></td> </tr> <tr> <td><code title="">prime;</code></td> <td><del class="diff-old">U+2032</del> <ins class= "diff-chg">U+02032</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">primes;</ins></code></td> <td><ins class="diff-chg">U+02119</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">prnE;</ins></code></td> <td><ins class="diff-chg">U+02AB5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">prnap;</ins></code></td> <td><ins class="diff-chg">U+02AB9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">prnsim;</ins></code></td> <td><ins class="diff-chg">U+022E8</ins></td> </tr> <tr> <td><code title="">prod;</code></td> <td><del class="diff-old">U+220F</del> <ins class= "diff-chg">U+0220F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">profalar;</ins></code></td> <td><ins class="diff-chg">U+0232E</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">profline;</ins></code></td> <td><ins class="diff-chg">U+02312</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">profsurf;</ins></code></td> <td><ins class="diff-chg">U+02313</ins></td> </tr> <tr> <td><code title="">prop;</code></td> <td><del class="diff-old">U+221D</del> <ins class= "diff-chg">U+0221D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">propto;</ins></code></td> <td><ins class="diff-chg">U+0221D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">prsim;</ins></code></td> <td><ins class="diff-chg">U+0227E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">prurel;</ins></code></td> <td><ins class="diff-chg">U+022B0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">pscr;</ins></code></td> <td><ins class="diff-chg">U+1D4C5</ins></td> </tr> <tr> <td><code title="">psi;</code></td> <td><del class="diff-old">U+03C8</del> <ins class= "diff-chg">U+003C8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">puncsp;</ins></code></td> <td><ins class="diff-chg">U+02008</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">qfr;</ins></code></td> <td><ins class="diff-chg">U+1D52E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">qint;</ins></code></td> <td><ins class="diff-chg">U+02A0C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">qopf;</ins></code></td> <td><ins class="diff-chg">U+1D562</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">qprime;</ins></code></td> <td><ins class="diff-chg">U+02057</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">qscr;</ins></code></td> <td><ins class="diff-chg">U+1D4C6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">quaternions;</ins></code></td> <td><ins class="diff-chg">U+0210D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">quatint;</ins></code></td> <td><ins class="diff-chg">U+02A16</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">quest;</ins></code></td> <td><ins class="diff-chg">U+0003F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">questeq;</ins></code></td> <td><ins class="diff-chg">U+0225F</ins></td> </tr> <tr> <td><code title="">quot;</code></td> <td><del class="diff-old">U+0022</del> <ins class= "diff-chg">U+00022</ins></td> </tr> <tr> <td><code title="">quot</code></td> <td><del class="diff-old">U+0022</del> <ins class= "diff-chg">U+00022</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rAarr;</ins></code></td> <td><ins class="diff-chg">U+021DB</ins></td> </tr> <tr> <td><code title="">rArr;</code></td> <td><del class="diff-old">U+21D2</del> <ins class= "diff-chg">U+021D2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rAtail;</ins></code></td> <td><ins class="diff-chg">U+0291C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rBarr;</ins></code></td> <td><ins class="diff-chg">U+0290F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rHar;</ins></code></td> <td><ins class="diff-chg">U+02964</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">race;</ins></code></td> <td><ins class="diff-chg">U+029DA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">racute;</ins></code></td> <td><ins class="diff-chg">U+00155</ins></td> </tr> <tr> <td><code title="">radic;</code></td> <td><del class="diff-old">U+221A</del> <ins class= "diff-chg">U+0221A</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">raemptyv;</ins></code></td> <td><ins class="diff-chg">U+029B3</ins></td> </tr> <tr> <td><code title="">rang;</code></td> <td><del class="diff-old">U+3009</del> <ins class= "diff-chg">U+027E9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rangd;</ins></code></td> <td><ins class="diff-chg">U+02992</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">range;</ins></code></td> <td><ins class="diff-chg">U+029A5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rangle;</ins></code></td> <td><ins class="diff-chg">U+027E9</ins></td> </tr> <tr> <td><code title="">raquo;</code></td> <td><del class="diff-old">U+00BB</del> <ins class= "diff-chg">U+000BB</ins></td> </tr> <tr> <td><code title="">raquo</code></td> <td><del class="diff-old">U+00BB</del> <ins class= "diff-chg">U+000BB</ins></td> </tr> <tr> <td><code title="">rarr;</code></td> <td><del class="diff-old">U+2192</del> <ins class= "diff-chg">U+02192</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rarrap;</ins></code></td> <td><ins class="diff-chg">U+02975</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rarrb;</ins></code></td> <td><ins class="diff-chg">U+021E5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rarrbfs;</ins></code></td> <td><ins class="diff-chg">U+02920</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rarrc;</ins></code></td> <td><ins class="diff-chg">U+02933</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rarrfs;</ins></code></td> <td><ins class="diff-chg">U+0291E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rarrhk;</ins></code></td> <td><ins class="diff-chg">U+021AA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rarrlp;</ins></code></td> <td><ins class="diff-chg">U+021AC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rarrpl;</ins></code></td> <td><ins class="diff-chg">U+02945</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rarrsim;</ins></code></td> <td><ins class="diff-chg">U+02974</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rarrtl;</ins></code></td> <td><ins class="diff-chg">U+021A3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rarrw;</ins></code></td> <td><ins class="diff-chg">U+0219D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ratail;</ins></code></td> <td><ins class="diff-chg">U+0291A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ratio;</ins></code></td> <td><ins class="diff-chg">U+02236</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">rationals;</ins></code></td> <td><ins class="diff-chg">U+0211A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rbarr;</ins></code></td> <td><ins class="diff-chg">U+0290D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rbbrk;</ins></code></td> <td><ins class="diff-chg">U+02773</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rbrace;</ins></code></td> <td><ins class="diff-chg">U+0007D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rbrack;</ins></code></td> <td><ins class="diff-chg">U+0005D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rbrke;</ins></code></td> <td><ins class="diff-chg">U+0298C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rbrksld;</ins></code></td> <td><ins class="diff-chg">U+0298E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rbrkslu;</ins></code></td> <td><ins class="diff-chg">U+02990</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rcaron;</ins></code></td> <td><ins class="diff-chg">U+00159</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rcedil;</ins></code></td> <td><ins class="diff-chg">U+00157</ins></td> </tr> <tr> <td><code title="">rceil;</code></td> <td><del class="diff-old">U+2309</del> <ins class= "diff-chg">U+02309</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rcub;</ins></code></td> <td><ins class="diff-chg">U+0007D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rcy;</ins></code></td> <td><ins class="diff-chg">U+00440</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rdca;</ins></code></td> <td><ins class="diff-chg">U+02937</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rdldhar;</ins></code></td> <td><ins class="diff-chg">U+02969</ins></td> </tr> <tr> <td><code title="">rdquo;</code></td> <td><del class="diff-old">U+201D</del> <ins class= "diff-chg">U+0201D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rdquor;</ins></code></td> <td><ins class="diff-chg">U+0201D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rdsh;</ins></code></td> <td><ins class="diff-chg">U+021B3</ins></td> </tr> <tr> <td><code title="">real;</code></td> <td><del class="diff-old">U+211C</del> <ins class= "diff-chg">U+0211C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">realine;</ins></code></td> <td><ins class="diff-chg">U+0211B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">realpart;</ins></code></td> <td><ins class="diff-chg">U+0211C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">reals;</ins></code></td> <td><ins class="diff-chg">U+0211D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rect;</ins></code></td> <td><ins class="diff-chg">U+025AD</ins></td> </tr> <tr> <td><code title="">reg;</code></td> <td><del class="diff-old">U+00AE</del> <ins class= "diff-chg">U+000AE</ins></td> </tr> <tr> <td><code title="">reg</code></td> <td><del class="diff-old">U+00AE</del> <ins class= "diff-chg">U+000AE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rfisht;</ins></code></td> <td><ins class="diff-chg">U+0297D</ins></td> </tr> <tr> <td><code title="">rfloor;</code></td> <td><del class="diff-old">U+230B</del> <ins class= "diff-chg">U+0230B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rfr;</ins></code></td> <td><ins class="diff-chg">U+1D52F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rhard;</ins></code></td> <td><ins class="diff-chg">U+021C1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rharu;</ins></code></td> <td><ins class="diff-chg">U+021C0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rharul;</ins></code></td> <td><ins class="diff-chg">U+0296C</ins></td> </tr> <tr> <td><code title="">rho;</code></td> <td><del class="diff-old">U+03C1</del> <ins class= "diff-chg">U+003C1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rhov;</ins></code></td> <td><ins class="diff-chg">U+003F1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">rightarrow;</ins></code></td> <td><ins class="diff-chg">U+02192</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">rightarrowtail;</ins></code></td> <td><ins class="diff-chg">U+021A3</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">rightharpoondown;</ins></code></td> <td><ins class="diff-chg">U+021C1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">rightharpoonup;</ins></code></td> <td><ins class="diff-chg">U+021C0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">rightleftarrows;</ins></code></td> <td><ins class="diff-chg">U+021C4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">rightleftharpoons;</ins></code></td> <td><ins class="diff-chg">U+021CC</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">rightrightarrows;</ins></code></td> <td><ins class="diff-chg">U+021C9</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">rightsquigarrow;</ins></code></td> <td><ins class="diff-chg">U+0219D</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">rightthreetimes;</ins></code></td> <td><ins class="diff-chg">U+022CC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ring;</ins></code></td> <td><ins class="diff-chg">U+002DA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">risingdotseq;</ins></code></td> <td><ins class="diff-chg">U+02253</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rlarr;</ins></code></td> <td><ins class="diff-chg">U+021C4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rlhar;</ins></code></td> <td><ins class="diff-chg">U+021CC</ins></td> </tr> <tr> <td><code title="">rlm;</code></td> <td><ins class="diff-new">U+0200F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-new">rmoust;</ins></code></td> <td><del class="diff-old">U+200F</del> <ins class= "diff-chg">U+023B1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">rmoustache;</ins></code></td> <td><ins class="diff-chg">U+023B1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rnmid;</ins></code></td> <td><ins class="diff-chg">U+02AEE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">roang;</ins></code></td> <td><ins class="diff-chg">U+027ED</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">roarr;</ins></code></td> <td><ins class="diff-chg">U+021FE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">robrk;</ins></code></td> <td><ins class="diff-chg">U+027E7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ropar;</ins></code></td> <td><ins class="diff-chg">U+02986</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ropf;</ins></code></td> <td><ins class="diff-chg">U+1D563</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">roplus;</ins></code></td> <td><ins class="diff-chg">U+02A2E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rotimes;</ins></code></td> <td><ins class="diff-chg">U+02A35</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rpar;</ins></code></td> <td><ins class="diff-chg">U+00029</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rpargt;</ins></code></td> <td><ins class="diff-chg">U+02994</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">rppolint;</ins></code></td> <td><ins class="diff-chg">U+02A12</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rrarr;</ins></code></td> <td><ins class="diff-chg">U+021C9</ins></td> </tr> <tr> <td><code title="">rsaquo;</code></td> <td><del class="diff-old">U+203A</del> <ins class= "diff-chg">U+0203A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rscr;</ins></code></td> <td><ins class="diff-chg">U+1D4C7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rsh;</ins></code></td> <td><ins class="diff-chg">U+021B1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rsqb;</ins></code></td> <td><ins class="diff-chg">U+0005D</ins></td> </tr> <tr> <td><code title="">rsquo;</code></td> <td><del class="diff-old">U+2019</del> <ins class= "diff-chg">U+02019</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rsquor;</ins></code></td> <td><ins class="diff-chg">U+02019</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rthree;</ins></code></td> <td><ins class="diff-chg">U+022CC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rtimes;</ins></code></td> <td><ins class="diff-chg">U+022CA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rtri;</ins></code></td> <td><ins class="diff-chg">U+025B9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rtrie;</ins></code></td> <td><ins class="diff-chg">U+022B5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rtrif;</ins></code></td> <td><ins class="diff-chg">U+025B8</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">rtriltri;</ins></code></td> <td><ins class="diff-chg">U+029CE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ruluhar;</ins></code></td> <td><ins class="diff-chg">U+02968</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">rx;</ins></code></td> <td><ins class="diff-chg">U+0211E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sacute;</ins></code></td> <td><ins class="diff-chg">U+0015B</ins></td> </tr> <tr> <td><code title="">sbquo;</code></td> <td><del class="diff-old">U+201A</del> <ins class= "diff-chg">U+0201A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sc;</ins></code></td> <td><ins class="diff-chg">U+0227B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">scE;</ins></code></td> <td><ins class="diff-chg">U+02AB4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">scap;</ins></code></td> <td><ins class="diff-chg">U+02AB8</ins></td> </tr> <tr> <td><code title="">scaron;</code></td> <td><del class="diff-old">U+0161</del> <ins class= "diff-chg">U+00161</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sccue;</ins></code></td> <td><ins class="diff-chg">U+0227D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sce;</ins></code></td> <td><ins class="diff-chg">U+02AB0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">scedil;</ins></code></td> <td><ins class="diff-chg">U+0015F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">scirc;</ins></code></td> <td><ins class="diff-chg">U+0015D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">scnE;</ins></code></td> <td><ins class="diff-chg">U+02AB6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">scnap;</ins></code></td> <td><ins class="diff-chg">U+02ABA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">scnsim;</ins></code></td> <td><ins class="diff-chg">U+022E9</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">scpolint;</ins></code></td> <td><ins class="diff-chg">U+02A13</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">scsim;</ins></code></td> <td><ins class="diff-chg">U+0227F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">scy;</ins></code></td> <td><ins class="diff-chg">U+00441</ins></td> </tr> <tr> <td><code title="">sdot;</code></td> <td><del class="diff-old">U+22C5</del> <ins class= "diff-chg">U+022C5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sdotb;</ins></code></td> <td><ins class="diff-chg">U+022A1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sdote;</ins></code></td> <td><ins class="diff-chg">U+02A66</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">seArr;</ins></code></td> <td><ins class="diff-chg">U+021D8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">searhk;</ins></code></td> <td><ins class="diff-chg">U+02925</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">searr;</ins></code></td> <td><ins class="diff-chg">U+02198</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">searrow;</ins></code></td> <td><ins class="diff-chg">U+02198</ins></td> </tr> <tr> <td><code title="">sect;</code></td> <td><del class="diff-old">U+00A7</del> <ins class= "diff-chg">U+000A7</ins></td> </tr> <tr> <td><code title="">sect</code></td> <td><del class="diff-old">U+00A7</del> <ins class= "diff-chg">U+000A7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">semi;</ins></code></td> <td><ins class="diff-chg">U+0003B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">seswar;</ins></code></td> <td><ins class="diff-chg">U+02929</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">setminus;</ins></code></td> <td><ins class="diff-chg">U+02216</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">setmn;</ins></code></td> <td><ins class="diff-chg">U+02216</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sext;</ins></code></td> <td><ins class="diff-chg">U+02736</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sfr;</ins></code></td> <td><ins class="diff-chg">U+1D530</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sfrown;</ins></code></td> <td><ins class="diff-chg">U+02322</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sharp;</ins></code></td> <td><ins class="diff-chg">U+0266F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">shchcy;</ins></code></td> <td><ins class="diff-chg">U+00449</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">shcy;</ins></code></td> <td><ins class="diff-chg">U+00448</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">shortmid;</ins></code></td> <td><ins class="diff-chg">U+02223</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">shortparallel;</ins></code></td> <td><ins class="diff-chg">U+02225</ins></td> </tr> <tr> <td><code title="">shy;</code></td> <td><del class="diff-old">U+00AD</del> <ins class= "diff-chg">U+000AD</ins></td> </tr> <tr> <td><code title="">shy</code></td> <td><del class="diff-old">U+00AD</del> <ins class= "diff-chg">U+000AD</ins></td> </tr> <tr> <td><code title="">sigma;</code></td> <td><del class="diff-old">U+03C3</del> <ins class= "diff-chg">U+003C3</ins></td> </tr> <tr> <td><code title="">sigmaf;</code></td> <td><del class="diff-old">U+03C2</del> <ins class= "diff-chg">U+003C2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sigmav;</ins></code></td> <td><ins class="diff-chg">U+003C2</ins></td> </tr> <tr> <td><code title="">sim;</code></td> <td><del class="diff-old">U+223C</del> <ins class= "diff-chg">U+0223C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">simdot;</ins></code></td> <td><ins class="diff-chg">U+02A6A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sime;</ins></code></td> <td><ins class="diff-chg">U+02243</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">simeq;</ins></code></td> <td><ins class="diff-chg">U+02243</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">simg;</ins></code></td> <td><ins class="diff-chg">U+02A9E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">simgE;</ins></code></td> <td><ins class="diff-chg">U+02AA0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">siml;</ins></code></td> <td><ins class="diff-chg">U+02A9D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">simlE;</ins></code></td> <td><ins class="diff-chg">U+02A9F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">simne;</ins></code></td> <td><ins class="diff-chg">U+02246</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">simplus;</ins></code></td> <td><ins class="diff-chg">U+02A24</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">simrarr;</ins></code></td> <td><ins class="diff-chg">U+02972</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">slarr;</ins></code></td> <td><ins class="diff-chg">U+02190</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">smallsetminus;</ins></code></td> <td><ins class="diff-chg">U+02216</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">smashp;</ins></code></td> <td><ins class="diff-chg">U+02A33</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">smeparsl;</ins></code></td> <td><ins class="diff-chg">U+029E4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">smid;</ins></code></td> <td><ins class="diff-chg">U+02223</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">smile;</ins></code></td> <td><ins class="diff-chg">U+02323</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">smt;</ins></code></td> <td><ins class="diff-chg">U+02AAA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">smte;</ins></code></td> <td><ins class="diff-chg">U+02AAC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">softcy;</ins></code></td> <td><ins class="diff-chg">U+0044C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sol;</ins></code></td> <td><ins class="diff-chg">U+0002F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">solb;</ins></code></td> <td><ins class="diff-chg">U+029C4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">solbar;</ins></code></td> <td><ins class="diff-chg">U+0233F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sopf;</ins></code></td> <td><ins class="diff-chg">U+1D564</ins></td> </tr> <tr> <td><code title="">spades;</code></td> <td><del class="diff-old">U+2660</del> <ins class= "diff-chg">U+02660</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">spadesuit;</ins></code></td> <td><ins class="diff-chg">U+02660</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">spar;</ins></code></td> <td><ins class="diff-chg">U+02225</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sqcap;</ins></code></td> <td><ins class="diff-chg">U+02293</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sqcup;</ins></code></td> <td><ins class="diff-chg">U+02294</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sqsub;</ins></code></td> <td><ins class="diff-chg">U+0228F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sqsube;</ins></code></td> <td><ins class="diff-chg">U+02291</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">sqsubset;</ins></code></td> <td><ins class="diff-chg">U+0228F</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">sqsubseteq;</ins></code></td> <td><ins class="diff-chg">U+02291</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sqsup;</ins></code></td> <td><ins class="diff-chg">U+02290</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sqsupe;</ins></code></td> <td><ins class="diff-chg">U+02292</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">sqsupset;</ins></code></td> <td><ins class="diff-chg">U+02290</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">sqsupseteq;</ins></code></td> <td><ins class="diff-chg">U+02292</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">squ;</ins></code></td> <td><ins class="diff-chg">U+025A1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">square;</ins></code></td> <td><ins class="diff-chg">U+025A1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">squarf;</ins></code></td> <td><ins class="diff-chg">U+025AA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">squf;</ins></code></td> <td><ins class="diff-chg">U+025AA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">srarr;</ins></code></td> <td><ins class="diff-chg">U+02192</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sscr;</ins></code></td> <td><ins class="diff-chg">U+1D4C8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ssetmn;</ins></code></td> <td><ins class="diff-chg">U+02216</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ssmile;</ins></code></td> <td><ins class="diff-chg">U+02323</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sstarf;</ins></code></td> <td><ins class="diff-chg">U+022C6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">star;</ins></code></td> <td><ins class="diff-chg">U+02606</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">starf;</ins></code></td> <td><ins class="diff-chg">U+02605</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">straightepsilon;</ins></code></td> <td><ins class="diff-chg">U+003F5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">straightphi;</ins></code></td> <td><ins class="diff-chg">U+003D5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">strns;</ins></code></td> <td><ins class="diff-chg">U+000AF</ins></td> </tr> <tr> <td><code title="">sub;</code></td> <td><del class="diff-old">U+2282</del> <ins class= "diff-chg">U+02282</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">subE;</ins></code></td> <td><ins class="diff-chg">U+02AC5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">subdot;</ins></code></td> <td><ins class="diff-chg">U+02ABD</ins></td> </tr> <tr> <td><code title="">sube;</code></td> <td><del class="diff-old">U+2286</del> <ins class= "diff-chg">U+02286</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">subedot;</ins></code></td> <td><ins class="diff-chg">U+02AC3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">submult;</ins></code></td> <td><ins class="diff-chg">U+02AC1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">subnE;</ins></code></td> <td><ins class="diff-chg">U+02ACB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">subne;</ins></code></td> <td><ins class="diff-chg">U+0228A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">subplus;</ins></code></td> <td><ins class="diff-chg">U+02ABF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">subrarr;</ins></code></td> <td><ins class="diff-chg">U+02979</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">subset;</ins></code></td> <td><ins class="diff-chg">U+02282</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">subseteq;</ins></code></td> <td><ins class="diff-chg">U+02286</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">subseteqq;</ins></code></td> <td><ins class="diff-chg">U+02AC5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">subsetneq;</ins></code></td> <td><ins class="diff-chg">U+0228A</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">subsetneqq;</ins></code></td> <td><ins class="diff-chg">U+02ACB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">subsim;</ins></code></td> <td><ins class="diff-chg">U+02AC7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">subsub;</ins></code></td> <td><ins class="diff-chg">U+02AD5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">subsup;</ins></code></td> <td><ins class="diff-chg">U+02AD3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">succ;</ins></code></td> <td><ins class="diff-chg">U+0227B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">succapprox;</ins></code></td> <td><ins class="diff-chg">U+02AB8</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">succcurlyeq;</ins></code></td> <td><ins class="diff-chg">U+0227D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">succeq;</ins></code></td> <td><ins class="diff-chg">U+02AB0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">succnapprox;</ins></code></td> <td><ins class="diff-chg">U+02ABA</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">succneqq;</ins></code></td> <td><ins class="diff-chg">U+02AB6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">succnsim;</ins></code></td> <td><ins class="diff-chg">U+022E9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">succsim;</ins></code></td> <td><ins class="diff-chg">U+0227F</ins></td> </tr> <tr> <td><code title="">sum;</code></td> <td><del class="diff-old">U+2211</del> <ins class= "diff-chg">U+02211</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">sung;</ins></code></td> <td><ins class="diff-chg">U+0266A</ins></td> </tr> <tr> <td><code title="">sup1;</code></td> <td><del class="diff-old">U+00B9</del> <ins class= "diff-chg">U+000B9</ins></td> </tr> <tr> <td><code title="">sup1</code></td> <td><del class="diff-old">U+00B9</del> <ins class= "diff-chg">U+000B9</ins></td> </tr> <tr> <td><code title="">sup2;</code></td> <td><del class="diff-old">U+00B2</del> <ins class= "diff-chg">U+000B2</ins></td> </tr> <tr> <td><code title="">sup2</code></td> <td><del class="diff-old">U+00B2</del> <ins class= "diff-chg">U+000B2</ins></td> </tr> <tr> <td><code title="">sup3;</code></td> <td><del class="diff-old">U+00B3</del> <ins class= "diff-chg">U+000B3</ins></td> </tr> <tr> <td><code title="">sup3</code></td> <td><del class="diff-old">U+00B3</del> <ins class= "diff-chg">U+000B3</ins></td> </tr> <tr> <td><code title="">sup;</code></td> <td><del class="diff-old">U+2283</del> <ins class= "diff-chg">U+02283</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">supE;</ins></code></td> <td><ins class="diff-chg">U+02AC6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">supdot;</ins></code></td> <td><ins class="diff-chg">U+02ABE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">supdsub;</ins></code></td> <td><ins class="diff-chg">U+02AD8</ins></td> </tr> <tr> <td><code title="">supe;</code></td> <td><del class="diff-old">U+2287</del> <ins class= "diff-chg">U+02287</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">supedot;</ins></code></td> <td><ins class="diff-chg">U+02AC4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">suphsub;</ins></code></td> <td><ins class="diff-chg">U+02AD7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">suplarr;</ins></code></td> <td><ins class="diff-chg">U+0297B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">supmult;</ins></code></td> <td><ins class="diff-chg">U+02AC2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">supnE;</ins></code></td> <td><ins class="diff-chg">U+02ACC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">supne;</ins></code></td> <td><ins class="diff-chg">U+0228B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">supplus;</ins></code></td> <td><ins class="diff-chg">U+02AC0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">supset;</ins></code></td> <td><ins class="diff-chg">U+02283</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">supseteq;</ins></code></td> <td><ins class="diff-chg">U+02287</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">supseteqq;</ins></code></td> <td><ins class="diff-chg">U+02AC6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">supsetneq;</ins></code></td> <td><ins class="diff-chg">U+0228B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">supsetneqq;</ins></code></td> <td><ins class="diff-chg">U+02ACC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">supsim;</ins></code></td> <td><ins class="diff-chg">U+02AC8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">supsub;</ins></code></td> <td><ins class="diff-chg">U+02AD4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">supsup;</ins></code></td> <td><ins class="diff-chg">U+02AD6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">swArr;</ins></code></td> <td><ins class="diff-chg">U+021D9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">swarhk;</ins></code></td> <td><ins class="diff-chg">U+02926</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">swarr;</ins></code></td> <td><ins class="diff-chg">U+02199</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">swarrow;</ins></code></td> <td><ins class="diff-chg">U+02199</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">swnwar;</ins></code></td> <td><ins class="diff-chg">U+0292A</ins></td> </tr> <tr> <td><code title="">szlig;</code></td> <td><del class="diff-old">U+00DF</del> <ins class= "diff-chg">U+000DF</ins></td> </tr> <tr> <td><code title="">szlig</code></td> <td><del class="diff-old">U+00DF</del> <ins class= "diff-chg">U+000DF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">target;</ins></code></td> <td><ins class="diff-chg">U+02316</ins></td> </tr> <tr> <td><code title="">tau;</code></td> <td><del class="diff-old">U+03C4</del> <ins class= "diff-chg">U+003C4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tbrk;</ins></code></td> <td><ins class="diff-chg">U+023B4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tcaron;</ins></code></td> <td><ins class="diff-chg">U+00165</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tcedil;</ins></code></td> <td><ins class="diff-chg">U+00163</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tcy;</ins></code></td> <td><ins class="diff-chg">U+00442</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tdot;</ins></code></td> <td><ins class="diff-chg">U+020DB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">telrec;</ins></code></td> <td><ins class="diff-chg">U+02315</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tfr;</ins></code></td> <td><ins class="diff-chg">U+1D531</ins></td> </tr> <tr> <td><code title="">there4;</code></td> <td><del class="diff-old">U+2234</del> <ins class= "diff-chg">U+02234</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">therefore;</ins></code></td> <td><ins class="diff-chg">U+02234</ins></td> </tr> <tr> <td><code title="">theta;</code></td> <td><del class="diff-old">U+03B8</del> <ins class= "diff-chg">U+003B8</ins></td> </tr> <tr> <td><code title="">thetasym;</code></td> <td><del class="diff-old">U+03D1</del> <ins class= "diff-chg">U+003D1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">thetav;</ins></code></td> <td><ins class="diff-chg">U+003D1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">thickapprox;</ins></code></td> <td><ins class="diff-chg">U+02248</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">thicksim;</ins></code></td> <td><ins class="diff-chg">U+0223C</ins></td> </tr> <tr> <td><code title="">thinsp;</code></td> <td><del class="diff-old">U+2009</del> <ins class= "diff-chg">U+02009</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">thkap;</ins></code></td> <td><ins class="diff-chg">U+02248</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">thksim;</ins></code></td> <td><ins class="diff-chg">U+0223C</ins></td> </tr> <tr> <td><code title="">thorn;</code></td> <td><del class="diff-old">U+00FE</del> <ins class= "diff-chg">U+000FE</ins></td> </tr> <tr> <td><code title="">thorn</code></td> <td><del class="diff-old">U+00FE</del> <ins class= "diff-chg">U+000FE</ins></td> </tr> <tr> <td><code title="">tilde;</code></td> <td><del class="diff-old">U+02DC</del> <ins class= "diff-chg">U+002DC</ins></td> </tr> <tr> <td><code title="">times;</code></td> <td><del class="diff-old">U+00D7</del> <ins class= "diff-chg">U+000D7</ins></td> </tr> <tr> <td><code title="">times</code></td> <td><del class="diff-old">U+00D7</del> <ins class= "diff-chg">U+000D7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">timesb;</ins></code></td> <td><ins class="diff-chg">U+022A0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">timesbar;</ins></code></td> <td><ins class="diff-chg">U+02A31</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">timesd;</ins></code></td> <td><ins class="diff-chg">U+02A30</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tint;</ins></code></td> <td><ins class="diff-chg">U+0222D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">toea;</ins></code></td> <td><ins class="diff-chg">U+02928</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">top;</ins></code></td> <td><ins class="diff-chg">U+022A4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">topbot;</ins></code></td> <td><ins class="diff-chg">U+02336</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">topcir;</ins></code></td> <td><ins class="diff-chg">U+02AF1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">topf;</ins></code></td> <td><ins class="diff-chg">U+1D565</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">topfork;</ins></code></td> <td><ins class="diff-chg">U+02ADA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tosa;</ins></code></td> <td><ins class="diff-chg">U+02929</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tprime;</ins></code></td> <td><ins class="diff-chg">U+02034</ins></td> </tr> <tr> <td><code title="">trade;</code></td> <td><del class="diff-old">U+2122</del> <ins class= "diff-chg">U+02122</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">triangle;</ins></code></td> <td><ins class="diff-chg">U+025B5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">triangledown;</ins></code></td> <td><ins class="diff-chg">U+025BF</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">triangleleft;</ins></code></td> <td><ins class="diff-chg">U+025C3</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">trianglelefteq;</ins></code></td> <td><ins class="diff-chg">U+022B4</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">triangleq;</ins></code></td> <td><ins class="diff-chg">U+0225C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">triangleright;</ins></code></td> <td><ins class="diff-chg">U+025B9</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">trianglerighteq;</ins></code></td> <td><ins class="diff-chg">U+022B5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tridot;</ins></code></td> <td><ins class="diff-chg">U+025EC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">trie;</ins></code></td> <td><ins class="diff-chg">U+0225C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">triminus;</ins></code></td> <td><ins class="diff-chg">U+02A3A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">triplus;</ins></code></td> <td><ins class="diff-chg">U+02A39</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">trisb;</ins></code></td> <td><ins class="diff-chg">U+029CD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tritime;</ins></code></td> <td><ins class="diff-chg">U+02A3B</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">trpezium;</ins></code></td> <td><ins class="diff-chg">U+023E2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tscr;</ins></code></td> <td><ins class="diff-chg">U+1D4C9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tscy;</ins></code></td> <td><ins class="diff-chg">U+00446</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tshcy;</ins></code></td> <td><ins class="diff-chg">U+0045B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">tstrok;</ins></code></td> <td><ins class="diff-chg">U+00167</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">twixt;</ins></code></td> <td><ins class="diff-chg">U+0226C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">twoheadleftarrow;</ins></code></td> <td><ins class="diff-chg">U+0219E</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">twoheadrightarrow;</ins></code></td> <td><ins class="diff-chg">U+021A0</ins></td> </tr> <tr> <td><code title="">uArr;</code></td> <td><del class="diff-old">U+21D1</del> <ins class= "diff-chg">U+021D1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">uHar;</ins></code></td> <td><ins class="diff-chg">U+02963</ins></td> </tr> <tr> <td><code title="">uacute;</code></td> <td><del class="diff-old">U+00FA</del> <ins class= "diff-chg">U+000FA</ins></td> </tr> <tr> <td><code title="">uacute</code></td> <td><del class="diff-old">U+00FA</del> <ins class= "diff-chg">U+000FA</ins></td> </tr> <tr> <td><code title="">uarr;</code></td> <td><del class="diff-old">U+2191</del> <ins class= "diff-chg">U+02191</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ubrcy;</ins></code></td> <td><ins class="diff-chg">U+0045E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ubreve;</ins></code></td> <td><ins class="diff-chg">U+0016D</ins></td> </tr> <tr> <td><code title="">ucirc;</code></td> <td><del class="diff-old">U+00FB</del> <ins class= "diff-chg">U+000FB</ins></td> </tr> <tr> <td><code title="">ucirc</code></td> <td><del class="diff-old">U+00FB</del> <ins class= "diff-chg">U+000FB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ucy;</ins></code></td> <td><ins class="diff-chg">U+00443</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">udarr;</ins></code></td> <td><ins class="diff-chg">U+021C5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">udblac;</ins></code></td> <td><ins class="diff-chg">U+00171</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">udhar;</ins></code></td> <td><ins class="diff-chg">U+0296E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ufisht;</ins></code></td> <td><ins class="diff-chg">U+0297E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ufr;</ins></code></td> <td><ins class="diff-chg">U+1D532</ins></td> </tr> <tr> <td><code title="">ugrave;</code></td> <td><del class="diff-old">U+00F9</del> <ins class= "diff-chg">U+000F9</ins></td> </tr> <tr> <td><code title="">ugrave</code></td> <td><del class="diff-old">U+00F9</del> <ins class= "diff-chg">U+000F9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">uharl;</ins></code></td> <td><ins class="diff-chg">U+021BF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">uharr;</ins></code></td> <td><ins class="diff-chg">U+021BE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">uhblk;</ins></code></td> <td><ins class="diff-chg">U+02580</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ulcorn;</ins></code></td> <td><ins class="diff-chg">U+0231C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">ulcorner;</ins></code></td> <td><ins class="diff-chg">U+0231C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ulcrop;</ins></code></td> <td><ins class="diff-chg">U+0230F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ultri;</ins></code></td> <td><ins class="diff-chg">U+025F8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">umacr;</ins></code></td> <td><ins class="diff-chg">U+0016B</ins></td> </tr> <tr> <td><code title="">uml;</code></td> <td><del class="diff-old">U+00A8</del> <ins class= "diff-chg">U+000A8</ins></td> </tr> <tr> <td><code title="">uml</code></td> <td><del class="diff-old">U+00A8</del> <ins class= "diff-chg">U+000A8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">uogon;</ins></code></td> <td><ins class="diff-chg">U+00173</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">uopf;</ins></code></td> <td><ins class="diff-chg">U+1D566</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">uparrow;</ins></code></td> <td><ins class="diff-chg">U+02191</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">updownarrow;</ins></code></td> <td><ins class="diff-chg">U+02195</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">upharpoonleft;</ins></code></td> <td><ins class="diff-chg">U+021BF</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">upharpoonright;</ins></code></td> <td><ins class="diff-chg">U+021BE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">uplus;</ins></code></td> <td><ins class="diff-chg">U+0228E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">upsi;</ins></code></td> <td><ins class="diff-chg">U+003C5</ins></td> </tr> <tr> <td><code title="">upsih;</code></td> <td><del class="diff-old">U+03D2</del> <ins class= "diff-chg">U+003D2</ins></td> </tr> <tr> <td><code title="">upsilon;</code></td> <td><del class="diff-old">U+03C5</del> <ins class= "diff-chg">U+003C5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">upuparrows;</ins></code></td> <td><ins class="diff-chg">U+021C8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">urcorn;</ins></code></td> <td><ins class="diff-chg">U+0231D</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">urcorner;</ins></code></td> <td><ins class="diff-chg">U+0231D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">urcrop;</ins></code></td> <td><ins class="diff-chg">U+0230E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">uring;</ins></code></td> <td><ins class="diff-chg">U+0016F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">urtri;</ins></code></td> <td><ins class="diff-chg">U+025F9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">uscr;</ins></code></td> <td><ins class="diff-chg">U+1D4CA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">utdot;</ins></code></td> <td><ins class="diff-chg">U+022F0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">utilde;</ins></code></td> <td><ins class="diff-chg">U+00169</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">utri;</ins></code></td> <td><ins class="diff-chg">U+025B5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">utrif;</ins></code></td> <td><ins class="diff-chg">U+025B4</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">uuarr;</ins></code></td> <td><ins class="diff-chg">U+021C8</ins></td> </tr> <tr> <td><code title="">uuml;</code></td> <td><del class="diff-old">U+00FC</del> <ins class= "diff-chg">U+000FC</ins></td> </tr> <tr> <td><code title="">uuml</code></td> <td><del class="diff-old">U+00FC</del> <ins class= "diff-chg">U+000FC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">uwangle;</ins></code></td> <td><ins class="diff-chg">U+029A7</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vArr;</ins></code></td> <td><ins class="diff-chg">U+021D5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vBar;</ins></code></td> <td><ins class="diff-chg">U+02AE8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vBarv;</ins></code></td> <td><ins class="diff-chg">U+02AE9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vDash;</ins></code></td> <td><ins class="diff-chg">U+022A8</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vangrt;</ins></code></td> <td><ins class="diff-chg">U+0299C</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">varepsilon;</ins></code></td> <td><ins class="diff-chg">U+003B5</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">varkappa;</ins></code></td> <td><ins class="diff-chg">U+003F0</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">varnothing;</ins></code></td> <td><ins class="diff-chg">U+02205</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">varphi;</ins></code></td> <td><ins class="diff-chg">U+003C6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">varpi;</ins></code></td> <td><ins class="diff-chg">U+003D6</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">varpropto;</ins></code></td> <td><ins class="diff-chg">U+0221D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">varr;</ins></code></td> <td><ins class="diff-chg">U+02195</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">varrho;</ins></code></td> <td><ins class="diff-chg">U+003F1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">varsigma;</ins></code></td> <td><ins class="diff-chg">U+003C2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">vartheta;</ins></code></td> <td><ins class="diff-chg">U+003D1</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">vartriangleleft;</ins></code></td> <td><ins class="diff-chg">U+022B2</ins></td> </tr> <tr> <td><code title=""><ins class= "diff-chg">vartriangleright;</ins></code></td> <td><ins class="diff-chg">U+022B3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vcy;</ins></code></td> <td><ins class="diff-chg">U+00432</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vdash;</ins></code></td> <td><ins class="diff-chg">U+022A2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vee;</ins></code></td> <td><ins class="diff-chg">U+02228</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">veebar;</ins></code></td> <td><ins class="diff-chg">U+022BB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">veeeq;</ins></code></td> <td><ins class="diff-chg">U+0225A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vellip;</ins></code></td> <td><ins class="diff-chg">U+022EE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">verbar;</ins></code></td> <td><ins class="diff-chg">U+0007C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vert;</ins></code></td> <td><ins class="diff-chg">U+0007C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vfr;</ins></code></td> <td><ins class="diff-chg">U+1D533</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vltri;</ins></code></td> <td><ins class="diff-chg">U+022B2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vopf;</ins></code></td> <td><ins class="diff-chg">U+1D567</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vprop;</ins></code></td> <td><ins class="diff-chg">U+0221D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vrtri;</ins></code></td> <td><ins class="diff-chg">U+022B3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vscr;</ins></code></td> <td><ins class="diff-chg">U+1D4CB</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">vzigzag;</ins></code></td> <td><ins class="diff-chg">U+0299A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">wcirc;</ins></code></td> <td><ins class="diff-chg">U+00175</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">wedbar;</ins></code></td> <td><ins class="diff-chg">U+02A5F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">wedge;</ins></code></td> <td><ins class="diff-chg">U+02227</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">wedgeq;</ins></code></td> <td><ins class="diff-chg">U+02259</ins></td> </tr> <tr> <td><code title="">weierp;</code></td> <td><del class="diff-old">U+2118</del> <ins class= "diff-chg">U+02118</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">wfr;</ins></code></td> <td><ins class="diff-chg">U+1D534</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">wopf;</ins></code></td> <td><ins class="diff-chg">U+1D568</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">wp;</ins></code></td> <td><ins class="diff-chg">U+02118</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">wr;</ins></code></td> <td><ins class="diff-chg">U+02240</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">wreath;</ins></code></td> <td><ins class="diff-chg">U+02240</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">wscr;</ins></code></td> <td><ins class="diff-chg">U+1D4CC</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">xcap;</ins></code></td> <td><ins class="diff-chg">U+022C2</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">xcirc;</ins></code></td> <td><ins class="diff-chg">U+025EF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">xcup;</ins></code></td> <td><ins class="diff-chg">U+022C3</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">xdtri;</ins></code></td> <td><ins class="diff-chg">U+025BD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">xfr;</ins></code></td> <td><ins class="diff-chg">U+1D535</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">xhArr;</ins></code></td> <td><ins class="diff-chg">U+027FA</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">xharr;</ins></code></td> <td><ins class="diff-chg">U+027F7</ins></td> </tr> <tr> <td><code title="">xi;</code></td> <td><del class="diff-old">U+03BE</del> <ins class= "diff-chg">U+003BE</ins></td> </tr> <tr> <td><code title=""><del class="diff-old">yacute;</del> <ins class= "diff-chg">xlArr;</ins></code></td> <td><del class="diff-old">U+00FD</del> <ins class= "diff-chg">U+027F8</ins></td> </tr> <tr> <td><code title=""><del class="diff-old">yacute</del> <ins class= "diff-chg">xlarr;</ins></code></td> <td><del class="diff-old">U+00FD</del> <ins class= "diff-chg">U+027F5</ins></td> </tr> <tr> <td><code title=""><del class="diff-old">yen;</del> <ins class= "diff-chg">xmap;</ins></code></td> <td><del class="diff-old">U+00A5</del> <ins class= "diff-chg">U+027FC</ins></td> </tr> <tr> <td><code title=""><del class="diff-old">yen</del> <ins class= "diff-chg">xnis;</ins></code></td> <td><del class="diff-old">U+00A5</del> <ins class= "diff-chg">U+022FB</ins></td> </tr> <tr> <td><code title=""><del class="diff-old">yuml;</del> <ins class= "diff-chg">xodot;</ins></code></td> <td><del class="diff-old">U+00FF</del> <ins class= "diff-chg">U+02A00</ins></td> </tr> <tr> <td><code title=""><del class="diff-old">yuml</del> <ins class= "diff-chg">xopf;</ins></code></td> <td><del class="diff-old">U+00FF</del> <ins class= "diff-chg">U+1D569</ins></td> </tr> <tr> <td><code title=""><del class="diff-old">zeta;</del> <ins class= "diff-chg">xoplus;</ins></code></td> <td><del class="diff-old">U+03B6</del> <ins class= "diff-chg">U+02A01</ins></td> </tr> <tr> <td><code title=""><del class="diff-old">zwj;</del> <ins class= "diff-chg">xotime;</ins></code></td> <td><del class="diff-old">U+200D</del> <ins class= "diff-chg">U+02A02</ins></td> </tr> <tr> <td><code title=""><del class="diff-old">zwnj;</del> <ins class= "diff-chg">xrArr;</ins></code></td> <td><del class="diff-old">U+200C 9. WYSIWYG editors WYSIWYG editors are authoring tools with a predominantly presentation-driven user interface. 9.1. Presentational markup 9.1.1. WYSIWYG signature WYSIWYG editors must include a meta</del> <ins class= "diff-chg">U+027F9</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">xrarr;</ins></code> <del class="diff-old">element in the head</del></td> <td><ins class="diff-chg">U+027F6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">xscr;</ins></code> <del class="diff-old">element whose name</del></td> <td><ins class="diff-chg">U+1D4CD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">xsqcup;</ins></code> <del class="diff-old">attribute has the value generator</del></td> <td><ins class="diff-chg">U+02A06</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">xuplus;</ins></code> <del class="diff-old">and whose content</del></td> <td><ins class="diff-chg">U+02A04</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">xutri;</ins></code> <del class="diff-old">attribute's value ends with the string "</del></td> <td><ins class="diff-chg">U+025B3</ins></td> </tr> <tr> <td><code title=""><del class="diff-old">(WYSIWYG editor)</del> <ins class="diff-chg">xvee;</ins></code> <del class="diff-old">". Non-WYSIWYG authoring tools must not include this string in their generator string. This entire section will probably be dropped. The intent of this section was to allow a way for WYSIWYG editors, which aren't going to use semantic markup, to still write conforming documents, while not letting it be ok for hand-coding authors to not use semantic markup. We still need some sort of solution to this, but it's not clear what it is. 9.1.2. The font</del></td> <td><ins class="diff-chg">U+022C1</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">xwedge;</ins></code> <del class="diff-old">element Categories Phrasing content . Contexts in which this element may be used: Where phrasing content is expected. Content model: Transparent . Element-specific attributes: style</del></td> <td><ins class="diff-chg">U+022C0</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">yacute;</ins></code> <del class="diff-old">DOM interface: <pre class=idl>interface { readonly attribute CSSStyleDeclaration ; }; This entire section will probably be dropped. The intent of this section was to allow a way for WYSIWYG editors, which don't have enough information to use the "real" "semantic" elements, to still make HTML pages without abusing those semantic elements (since abusing elements is even worse than not using them in the first place). We have still got to find a solution to this, while not letting it be ok for hand-coding authors to abuse the style="" attribute. The font</del></td> <td><ins class="diff-chg">U+000FD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">yacute</ins></code> <del class="diff-old">element doesn't represent anything. It must not be used except by WYSIWYG editors , which may use it to achieve presentational affects. Even WYSIWYG editors, however, should make every effort to use appropriate semantic markup and avoid the use of media-specific presentational markup. Conformance checkers must consider this element to be non-conforming if it is used on a page lacking the WYSIWYG signature . The following would be syntactically legal (as the output from a WYSIWYG editor, though not anywhere else): <html> <head> <title></title> <meta name="generator" content="Sample Editor 1.0 </head> <body> <font style="display: block; border: solid"> <h1>Hello.</h1> </font> <p> <font style="color: orange; background: white">How <font style="color: yellow; background: white">do <font style="color: green; background: white"> <font style="color: blue; background: white">do?</font> </p> </body> </html> The first font</del></td> <td><ins class="diff-chg">U+000FD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">yacy;</ins></code> <del class="diff-old">element is conformant because h1</del></td> <td><ins class="diff-chg">U+0044F</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ycirc;</ins></code> <del class="diff-old">and p</del></td> <td><ins class="diff-chg">U+00177</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">ycy;</ins></code> <del class="diff-old">elements are both allowed in body</del></td> <td><ins class="diff-chg">U+0044B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">yen;</ins></code> <del class="diff-old">elements. the next four are allowed because text and em</del></td> <td><ins class="diff-chg">U+000A5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">yen</ins></code> <del class="diff-old">elements are allowed in p</del></td> <td><ins class="diff-chg">U+000A5</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">yfr;</ins></code> <del class="diff-old">elements. The style</del></td> <td><ins class="diff-chg">U+1D536</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">yicy;</ins></code> <del class="diff-old">attribute, if specified, must contain only a list of zero or more semicolon-separated (;) CSS declarations. [CSS21] We probably need to move this attribute to more elements, maybe even all of them, though if we do that we really should find a way to strongly discourage its use (and the use of its DOM attribute) for non-WYSIWYG authors. The declarations specified must be parsed and treated as the body of a declaration block whose selector matches just that font</del></td> <td><ins class="diff-chg">U+00457</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">yopf;</ins></code> <del class="diff-old">element. For the purposes of the CSS cascade, the attribute must be considered to be a 'style' attribute at the author level. The style</del></td> <td><ins class="diff-chg">U+1D56A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">yscr;</ins></code> <del class="diff-old">DOM attribute must return a CSSStyleDeclaration</del></td> <td><ins class="diff-chg">U+1D4CE</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">yucy;</ins></code> <del class="diff-old">whose value represents the declarations specified in the attribute, if present. Mutating the CSSStyleDeclaration</del></td> <td><ins class="diff-chg">U+0044E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">yuml;</ins></code> <del class="diff-old">object must create a style</del></td> <td><ins class="diff-chg">U+000FF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">yuml</ins></code> <del class="diff-old">attribute on the element (if there isn't one already) and then change its value to be a value representing the serialised form of the CSSStyleDeclaration</del></td> <td><ins class="diff-chg">U+000FF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">zacute;</ins></code> <del class="diff-old">object. [CSSOM]</del></td> <td><ins class="diff-chg">U+0017A</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">zcaron;</ins></code></td> <td><ins class="diff-chg">U+0017E</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">zcy;</ins></code></td> <td><ins class="diff-chg">U+00437</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">zdot;</ins></code></td> <td><ins class="diff-chg">U+0017C</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">zeetrf;</ins></code></td> <td><ins class="diff-chg">U+02128</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">zeta;</ins></code></td> <td><ins class="diff-chg">U+003B6</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">zfr;</ins></code></td> <td><ins class="diff-chg">U+1D537</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">zhcy;</ins></code></td> <td><ins class="diff-chg">U+00436</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">zigrarr;</ins></code></td> <td><ins class="diff-chg">U+021DD</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">zopf;</ins></code></td> <td><ins class="diff-chg">U+1D56B</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">zscr;</ins></code></td> <td><ins class="diff-chg">U+1D4CF</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">zwj;</ins></code></td> <td><ins class="diff-chg">U+0200D</ins></td> </tr> <tr> <td><code title=""><ins class="diff-chg">zwnj;</ins></code></td> <td><ins class="diff-chg">U+0200C</ins></td> </tr> </tbody> </table> </div> <h2 id="rendering"><del class= "diff-old">10.</del> <ins class="diff-chg">9.</ins> Rendering <ins class="diff-new">and user-agent behavior</ins></h2> This section will probably include details on how to render DATAGRID (including its pseudo-elements ), drag-and-drop, etc, in a visual medium, in concert with CSS. Terms that need to be defined include: <dfn id="sizing">sizing of embedded content</dfn> CSS UAs in visual media must, when scrolling a page to a fragment identifier, align the top of the viewport with the target element's top border edge. must define letting the user <ins class= "diff-new">"</ins> <dfn id="obtain">obtain a physical form</dfn> <ins class="diff-new">(or a representation of a physical form)"</ins> of a document (printing) and what this means for the <del class="diff-old">UA</del> <ins class="diff-chg">UA, in particular creating a new view for the print media.</ins> Must define that in CSS, tag names in HTML documents, and class names in quirks mode documents, are case-insensitive. <h3 id="rendering0"><del class= "diff-old">10.1.</del> <ins class="diff-chg">9.1</ins> Rendering and the DOM</h3> This section is wrong. mediaMode will end up on Window, I think. All views implement Window. Any object implement the <code>AbstractView</code> interface must also implement the <code><a href= "#mediamodeabstractview">MediaModeAbstractView</a></code> interface. <pre class="idl"> interface <dfn id= "mediamodeabstractview">MediaModeAbstractView</dfn> { readonly attribute DOMString <a href="#mediamode">mediaMode</a>; }; </pre> The <dfn id="mediamode"><code>mediaMode</code></dfn> attribute on objects implementing the <code><a href= "#mediamodeabstractview">MediaModeAbstractView</a></code> interface must return the string that represents the canvas' current rendering mode ( <code>screen</code> , <code>print</code> , etc). This is a lowercase string, as <a href= "http://www.w3.org/TR/CSS21/media.html#media-types">defined by the CSS specification</a> . <a href="#references">[CSS21]</a> Some user agents may support multiple media, in which case there will exist multiple objects implementing the <code>AbstractView</code> interface. Only the default view implements the <code><a href="#window">Window</a></code> interface. The other views can be reached using the <code><a href= "#view">view</a></code> attribute of the <code>UIEvent</code> <del class="diff-old">inteface,</del> <ins class= "diff-chg">interface,</ins> during event propagation. There is no way currently to enumerate all the views. <h3 id="rendering1"><del class= "diff-old">10.2.</del> <ins class="diff-chg">9.2</ins> Rendering and menus/toolbars</h3> <h4 id="the-icon"><del class= "diff-old">10.2.1.</del> <ins class="diff-chg">9.2.1</ins> The 'icon' property</h4> UAs should use the command's Icon as the default generic icon provided by the user agent when the 'icon' property computes to 'auto' on an element that either defines a command or refers to one using the <code title="command-attribute">command</code> attribute, but when the property computes to an actual image, it should use that image instead. <h3 id="obsolete"><ins class= "diff-new">9.3</ins> <ins class="diff-new">Obsolete elements, attributes, and APIs</ins></h3> <h4 id="the-body0"><ins class= "diff-new">9.3.1</ins> <ins class="diff-new">The</ins> <code><a href="#body0"><ins class="diff-new">body</ins></a></code> <ins class="diff-new">element</ins></h4> <ins class="diff-new">Need to define the content attributes in terms of CSS or something.</ins> <pre class="idl"> [XXX] interface <a href= "#htmldocument">HTMLDocument</a> {<ins class="diff-new"> attribute DOMString <a href="#fgcolor" title= "dom-document-fgColor">fgColor</a>; attribute DOMString <a href="#bgcolor" title= "dom-document-bgColor">bgColor</a>; attribute DOMString <a href="#linkcolor" title= "dom-document-linkColor">linkColor</a>; attribute DOMString <a href="#vlinkcolor" title= "dom-document-vlinkColor">vlinkColor</a>; attribute DOMString <a href="#alinkcolor" title= "dom-document-alinkColor">alinkColor</a>; }; </ins> </pre> <ins class="diff-new">The</ins> <dfn id="fgcolor" title= "dom-document-fgColor"><code><ins class= "diff-new">fgColor</ins></code></dfn> <ins class= "diff-new">attribute on the</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">object must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the</ins> <code title="attr-body-text"><ins class= "diff-new">text</ins></code> <ins class="diff-new">attribute on</ins> <a href="#the-body1"><ins class="diff-new">the</ins> <code><ins class="diff-new">body</ins></code> <ins class= "diff-new">element</ins></a> . <ins class="diff-new">The</ins> <dfn id="bgcolor" title= "dom-document-bgColor"><code><ins class= "diff-new">bgColor</ins></code></dfn> <ins class= "diff-new">attribute on the</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">object must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the</ins> <code title="attr-body-bgcolor"><ins class= "diff-new">bgcolor</ins></code> <ins class="diff-new">attribute on</ins> <a href="#the-body1"><ins class="diff-new">the</ins> <code><ins class="diff-new">body</ins></code> <ins class= "diff-new">element</ins></a> . <ins class="diff-new">The</ins> <dfn id="linkcolor" title= "dom-document-linkColor"><code><ins class= "diff-new">linkColor</ins></code></dfn> <ins class= "diff-new">attribute on the</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">object must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the</ins> <code title="attr-body-link"><ins class= "diff-new">link</ins></code> <ins class="diff-new">attribute on</ins> <a href="#the-body1"><ins class="diff-new">the</ins> <code><ins class="diff-new">body</ins></code> <ins class= "diff-new">element</ins></a> . <ins class="diff-new">The</ins> <dfn id="vlinkcolor" title= "dom-document-vLinkColor"><code><ins class= "diff-new">vLinkColor</ins></code></dfn> <ins class= "diff-new">attribute on the</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">object must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the</ins> <code title="attr-body-vlink"><ins class= "diff-new">vlink</ins></code> <ins class="diff-new">attribute on</ins> <a href="#the-body1"><ins class="diff-new">the</ins> <code><ins class="diff-new">body</ins></code> <ins class= "diff-new">element</ins></a> . <ins class="diff-new">The</ins> <dfn id="alinkcolor" title= "dom-document-aLinkColor"><code><ins class= "diff-new">aLinkColor</ins></code></dfn> <ins class= "diff-new">attribute on the</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">object must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the</ins> <code title="attr-body-alink"><ins class= "diff-new">alink</ins></code> <ins class="diff-new">attribute on</ins> <a href="#the-body1"><ins class="diff-new">the</ins> <code><ins class="diff-new">body</ins></code> <ins class= "diff-new">element</ins></a> . <pre ins="" class="diff-new"> class=idl>[XXX] interface <a href= "#htmlbodyelement">HTMLBodyElement</a> { attribute DOMString <a href="#text3" title= "dom-body-text">text</a>; attribute DOMString <a href="#bgcolor0" title= "dom-body-bgColor">bgColor</a>; attribute DOMString <a href="#background" title= "dom-body-background">background</a>; attribute DOMString <a href="#link0" title= "dom-body-link">link</a>; attribute DOMString <a href="#vlink" title= "dom-body-vLink">vLink</a>; attribute DOMString <a href="#alink" title= "dom-body-aLink">aLink</a>; }; </pre> <ins class="diff-new">The</ins> <dfn id="text3" title= "dom-body-text"><code><ins class="diff-new">text</ins></code></dfn> <ins class="diff-new">DOM attribute of the</ins> <code><a href= "#body0"><ins class="diff-new">body</ins></a></code> <ins class= "diff-new">element must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the element's</ins> <code title="attr-body-text"><ins class= "diff-new">text</ins></code> <ins class="diff-new">content attribute.</ins> <ins class="diff-new">The</ins> <dfn id="bgcolor0" title= "dom-body-bgColor"><code><ins class= "diff-new">bgColor</ins></code></dfn> <ins class="diff-new">DOM attribute of the</ins> <code><a href="#body0"><ins class= "diff-new">body</ins></a></code> <ins class="diff-new">element must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the element's</ins> <code title="attr-body-bgcolor"><ins class= "diff-new">bgcolor</ins></code> <ins class="diff-new">content attribute.</ins> <ins class="diff-new">The</ins> <dfn id="background" title= "dom-body-background"><code><ins class= "diff-new">background</ins></code></dfn> <ins class="diff-new">DOM attribute of the</ins> <code><a href="#body0"><ins class= "diff-new">body</ins></a></code> <ins class="diff-new">element must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the element's</ins> <code title="attr-body-background"><ins class= "diff-new">background</ins></code> <ins class="diff-new">content attribute.</ins> <ins class="diff-new">The</ins> <dfn id="link0" title= "dom-body-link"><code><ins class="diff-new">link</ins></code></dfn> <ins class="diff-new">DOM attribute of the</ins> <code><a href= "#body0"><ins class="diff-new">body</ins></a></code> <ins class= "diff-new">element must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the element's</ins> <code title="attr-body-link"><ins class= "diff-new">link</ins></code> <ins class="diff-new">content attribute.</ins> <ins class="diff-new">The</ins> <dfn id="alink" title= "dom-body-aLink"><code><ins class= "diff-new">aLink</ins></code></dfn> <ins class="diff-new">DOM attribute of the</ins> <code><a href="#body0"><ins class= "diff-new">body</ins></a></code> <ins class="diff-new">element must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the element's</ins> <code title="attr-body-alink"><ins class= "diff-new">alink</ins></code> <ins class="diff-new">content attribute.</ins> <ins class="diff-new">The</ins> <dfn id="vlink" title= "dom-body-vLink"><code><ins class= "diff-new">vLink</ins></code></dfn> <ins class="diff-new">DOM attribute of the</ins> <code><a href="#body0"><ins class= "diff-new">body</ins></a></code> <ins class="diff-new">element must</ins> <a href="#reflect"><ins class= "diff-new">reflect</ins></a> <ins class="diff-new">the element's</ins> <code title="attr-body-vlink"><ins class= "diff-new">vlink</ins></code> <ins class="diff-new">content attribute.</ins> <h4 id="the-applet"><ins class= "diff-new">9.3.2</ins> <ins class="diff-new">The</ins> <dfn id="applet"><code><ins class= "diff-new">applet</ins></code></dfn> <ins class= "diff-new">element</ins></h4> <ins class="diff-new">The</ins> <code><a href= "#applet"><ins class="diff-new">applet</ins></a></code> <ins class= "diff-new">element is a Java-specific variant of the</ins> <code><a href="#embed"><ins class="diff-new">embed</ins></a></code> <ins class="diff-new">element. In HTML5 the</ins> <code><a href= "#applet"><ins class="diff-new">applet</ins></a></code> <ins class= "diff-new">element is obsoleted so that all extension frameworks (Java, .NET, Flash, etc) are handled in a consistent manner.</ins> <ins class="diff-new">If the</ins> <a href="#sandboxed0"><ins class="diff-new">sandboxed plugins browsing context flag</ins></a> <ins class="diff-new">is set on the</ins> <a href="#browsing1"><ins class="diff-new">browsing context</ins></a> <ins class="diff-new">for which the</ins> <code><a href="#applet"><ins class= "diff-new">applet</ins></a></code> <ins class="diff-new">element's document is the</ins> <a href="#active"><ins class= "diff-new">active document</ins></a> ,<ins class="diff-new">then the element must be ignored (it represents nothing).</ins> <ins class="diff-new">Otherwise,</ins> <ins class="diff-new">define how the element works, if supported</ins> . <pre class="idl"> [XXX] interface <a href= "#htmldocument">HTMLDocument</a> {<ins class="diff-new"> readonly attribute <a href= "#htmlcollection0">HTMLCollection</a> <a href="#applets" title= "dom-document-applets">applets</a>; }; </ins> </pre> <ins class="diff-new">The</ins> <dfn id="applets" title= "dom-document-applets"><code><ins class= "diff-new">applets</ins></code></dfn> <ins class= "diff-new">attribute must return an</ins> <code><a href= "#htmlcollection0"><ins class= "diff-new">HTMLCollection</ins></a></code> <ins class= "diff-new">rooted at the</ins> <code><ins class= "diff-new">Document</ins></code> <ins class="diff-new">node, whose filter matches only</ins> <code><a href="#applet"><ins class= "diff-new">applet</ins></a></code> <ins class= "diff-new">elements.</ins> <h2 id="no"><del class="diff-old">11.</del> <ins class="diff-chg">10.</ins> Things that you can't do with this specification because they are better handled using other technologies that are further described herein</h2> This section is non-normative. There are certain features that are not handled by this specification because a client side markup language is not the right level for them, or because the features exist in other languages that can be integrated into this one. This section covers some of the more common requests. <h3 id="localization"><del class= "diff-old">11.1.</del> <ins class="diff-chg">10.1</ins> <del class="diff-old">Localisation</del> <ins class= "diff-chg">Localization</ins></h3> If you wish to create <del class="diff-old">localised</del> <ins class="diff-chg">localized</ins> versions of an HTML application, the best solution is to preprocess the files on the server, and then use HTTP content <del class= "diff-old">negotation</del> <ins class="diff-chg">negotiation</ins> to serve the appropriate language. <h3 id="declarative"><del class= "diff-old">11.2.</del> <ins class="diff-chg">10.2</ins> Declarative 2D vector graphics and animation</h3> Embedding vector graphics into XHTML documents is the domain of SVG. <h3 id="declarative0"><del class= "diff-old">11.3.</del> <ins class="diff-chg">10.3</ins> Declarative 3D scenes</h3> Embedding 3D imagery into XHTML documents is the domain of X3D, or technologies based on X3D that are namespace-aware. <h3 id="timers"><del class= "diff-old">11.4.</del> <ins class="diff-chg">10.4</ins> Timers</h3> This section is expected to be moved to the Window Object specification in due course. <pre class="idl"> <del class="diff-old">interface { </del> <ins class="diff-chg">[NoInterfaceObject] interface <dfn id= "windowtimers">WindowTimers</dfn> { </ins> // timers long <a href="#settimeout">setTimeout</a>(in <a href= "#timeouthandler">TimeoutHandler</a> handler, in long timeout); long <a href="#settimeout">setTimeout</a>(in <a href= "#timeouthandler">TimeoutHandler</a> handler, in long timeout, <var title="">arguments...</var>); long <a href= "#settimeout">setTimeout</a>(in DOMString code, in long timeout); long <a href= "#settimeout">setTimeout</a>(in DOMString code, in long timeout, in DOMString language); void <a href="#cleartimeout">clearTimeout</a>(in long handle); long <a href="#setinterval...">setInterval</a>(in <a href= "#timeouthandler">TimeoutHandler</a> handler, in long timeout); long <a href="#setinterval...">setInterval</a>(in <a href= "#timeouthandler">TimeoutHandler</a> handler, in long timeout, <var title="">arguments...</var>); long <a href= "#setinterval...">setInterval</a>(in DOMString code, in long timeout); long <a href= "#setinterval...">setInterval</a>(in DOMString code, in long timeout, in DOMString language); void <a href="#clearinterval">clearInterval</a>(in long handle); }; interface <dfn id="timeouthandler">TimeoutHandler</dfn> { <del class="diff-old"> void handleEvent(); </del> <ins class="diff-chg"> void handleEvent([Variadic] in any args); </ins> }; </pre> The <code><a href="#windowtimers">WindowTimers</a></code> interface must be obtainable from any <code><a href= "#window">Window</a></code> object using binding-specific casting methods. <ins class="diff-new">Actually even better would be to just mix it straight into Window somehow.</ins> The <code><a href="#settimeout">setTimeout</a></code> and <code><a href="#setinterval...">setInterval</a></code> methods allow authors to schedule timer-based events. The <dfn id="settimeout" title="setTimeout"><code>setTimeout( <var title="">handler</var> , <var title="">timeout</var> [, <var title="">arguments...</var> ])</code></dfn> method takes a reference to a <code><a href= "#timeouthandler">TimeoutHandler</a></code> object and a length of time in milliseconds. It must return a handle to the timeout created, and then asynchronously wait <var title="">timeout</var> milliseconds and then invoke <code>handleEvent()</code> on the <var title="">handler</var> object. If any <var title= "">arguments...</var> were provided, they must be passed to the <var title="">handler</var> as arguments to the <code>handleEvent()</code> function. <del class="diff-old">In the ECMAScript DOM binding, the ECMAScript native Function type must implement the TimeoutHandler interface such that invoking the handleEvent() method of that interface on the object from another language binding invokes the function itself, with the arguments passed to handleEvent() as the arguments passed to the function. In the ECMAScript DOM binding itself, however, the handleEvent() method of the interface is not directly accessible on Function objects. Such functions must be called in the scope of the browsing context in which they were created.</del> Alternatively, <dfn id="settimeout0" title= ""><code>setTimeout( <var title="">code</var> , <var title= "">timeout</var> [, <var title="">language</var> ])</code></dfn> may be used. This variant takes a string instead of a <code><a href="#timeouthandler">TimeoutHandler</a></code> object. That string must be parsed using the specified <var title= "">language</var> (defaulting to ECMAScript if the third argument is omitted) and executed in the scope of the <a href= "#browsing1">browsing context</a> associated with the <code><a href="#window">Window</a></code> object on which the <code title="setTimeout"><a href= "#settimeout">setTimeout()</a></code> method was invoked. Need to define <var title="">language</var> values. The <dfn id="setinterval..."><code>setInterval(...)</code></dfn> variants must work in the same way as the <code><a href= "#settimeout">setTimeout</a></code> variants except that <ins class="diff-new">if</ins> <var title=""><ins class= "diff-new">timeout</ins></var> <ins class="diff-new">is a value greater than zero,</ins> the <var title="">handler</var> or <code><a href="#code">code</a></code> must be invoked again every <var title="">timeout</var> milliseconds, not just the once. The <dfn id="cleartimeout"><code>clearTimeout()</code></dfn> and <dfn id="clearinterval"><code>clearInterval()</code></dfn> methods take one integer (the value returned by <code><a href= "#settimeout">setTimeout</a></code> and <code><a href= "#setinterval...">setInterval</a></code> respectively) and must cancel the specified timeout. When called with a value that does not correspond to an active timeout or interval, the methods must return without doing anything. Timeouts must never fire while another script is executing. (Thus the HTML scripting model is strictly single-threaded and not reentrant.) <h2 class="no-num" id="index"><ins class= "diff-chg">Index</ins></h2> <del class="diff-old">11.5. Events In the ECMAScript DOM binding, the ECMAScript native Function type must implement the EventListener interface such that invoking the handleEvent() method</del> <ins class="diff-chg">This section is non-normative.</ins> <ins class="diff-chg">List</ins> of <del class="diff-old">that interface on the object from another language binding invokes the function itself, with the event argument as its only argument. In the ECMAScript binding itself, however, the handleEvent() method</del> <ins class= "diff-chg">elements</ins> <ins class="diff-chg">List</ins> of <del class="diff-old">the interface is not directly accessible on Function objects. Such functions, when invoked, must be called in the scope</del> <ins class="diff-chg">attributes</ins> <ins class="diff-chg">List</ins> of <del class="diff-old">the browsing context that they were created in.</del> <ins class="diff-chg">interfaces</ins> <ins class="diff-chg">List of events</ins> <h2 class="no-num" id="references">References</h2> This section will be written in a future draft. <h2 class="no-num" id="acknowledgements">Acknowledgements</h2> Thanks to Aankhen, Aaron Boodman, Aaron Leventhal, Adam <ins class="diff-new">Barth, Adam</ins> Roben, <ins class= "diff-new">Addison Phillips, Adele Peterson,</ins> Adrian Sutton, Agustín Fernández, <ins class="diff-new">Alastair Campbell,</ins> Alexey Feldgendler, <ins class="diff-new">Anders Carlsson,</ins> Andrew Gove, Andrew Sidwell, Anne van Kesteren, Anthony Hickson, <ins class="diff-new">Anthony Ricaud,</ins> Antti Koivisto, <ins class="diff-new">Arphen Lin,</ins> Asbjørn Ulsberg, <ins class="diff-new">Ashley Sheridan, Aurelien Levy,</ins> Ben Godfrey, Ben Meadowcroft, <ins class="diff-new">Ben Millard,</ins> Benjamin Hawkes-Lewis, Bert Bos, Billy Wong, Bjoern Hoehrmann, Boris Zbarsky, Brad Fults, Brad Neuberg, Brady Eidson, Brendan Eich, Brett Wilson, Brian Campbell, <ins class="diff-new">Brian Smith, Bruce Miller, Cameron McCormack,</ins> Carlos Perelló Marín, Chao Cai, 윤석찬 (Channy Yun), Charl van Niekerk, Charles Iliya Krempeaux, Charles McCathieNevile, Christian Biesinger, Christian Johansen, Chriswa, <ins class="diff-new">Cole Robison, Collin Jackson,</ins> Daniel Brumbaugh Keeney, Daniel <ins class= "diff-new">Glazman, Daniel</ins> Peng, Daniel Spång, <ins class= "diff-new">Danny Sullivan,</ins> Darin <del class= "diff-old">Alder,</del> <ins class="diff-chg">Adler,</ins> Darin Fisher, Dave <ins class="diff-new">Camp, Dave</ins> Singer, Dave Townsend, David Baron, David <ins class="diff-new">Bloom, David Carlisle, David</ins> Flanagan, David Håsäther, David Hyatt, <ins class="diff-new">Dean Edridge, Debi Orton,</ins> Derek Featherstone, DeWitt Clinton, Dimitri Glazkov, dolphinling, Doron Rosenberg, Doug Kramer, Eira Monstad, Elliotte Harold, Erik Arvidsson, Evan Martin, <ins class="diff-new">Evan Prodromou,</ins> fantasai, Franck 'Shift' Quélain, Garrett Smith, Geoffrey <ins class="diff-new">Garen, Geoffrey</ins> Sneddon, Håkon Wium Lie, Henri Sivonen, Henrik Lied, <ins class="diff-new">Henry Mason, Hugh Winkler,</ins> Ignacio Javier, Ivo Emanuel Gonçalves, J. King, <ins class="diff-new">Jacques Distler,</ins> James Graham, James <ins class="diff-new">Justin Harrell, James</ins> M Snell, James Perrett, Jan-Klaas Kollhof, <ins class="diff-new">Jason White,</ins> Jasper Bryant-Greene, Jeff Cutsinger, Jeff Walden, Jens Bannmann, <ins class="diff-new">Jens Fendler,</ins> Jeroen van der Meer, <ins class="diff-new">Jim Jewett, Jim Meehan, Joe Clark, Jjgod Jiang,</ins> Joel Spolsky, <ins class="diff-new">Johan Herland,</ins> John Boyer, John Bussjaeger, John Harding, Johnny Stenback, Jon Perlow, Jonathan Worent, Jorgen Horstink, Josh Levenberg, Joshua Randall, Jukka K. Korpela, <ins class= "diff-new">Julian Reschke,</ins> Kai Hendry, Kornel Lesinski, 黒澤剛志 (KUROSAWA Takeshi), Kristof Zelechovski, Lachlan Hunt, Larry Page, Lars Gunther, <ins class="diff-new">Laura L. Carlson, Laura Wisewell,</ins> Laurens Holst, <ins class="diff-new">Lee Kowalkowski, Leif Halvard Silli,</ins> Lenny Domnitser, Léonard Bouchet, Leons Petrazickis, Logan, Loune, Maciej Stachowiak, <ins class="diff-new">Magnus Kristiansen,</ins> Malcolm Rowe, Mark Nottingham, Mark Rowe, Mark Schenk, Martijn Wargers, Martin Atkins, Martin Dürst, Martin Honnen, <ins class="diff-new">Masataka Yakura,</ins> Mathieu Henri, Matthew Mastracci, Matthew Raymond, Matthew Thomas, Mattias Waldau, Max Romantschuk, Michael 'Ratt' Iannarelli, Michael A. Nachbaur, Michael A. Puls II, Michael <ins class="diff-new">Carter, Michael</ins> Gratton, Michael Powers, <ins class="diff-new">Michael(tm) Smith,</ins> Michel Fortin, Michiel van der Blonk, Mihai Şucan, Mike Brown, Mike Dierken, Mike Dixon, Mike Schinkel, Mike Shaver, Mikko Rantalainen, Neil Deakin, <ins class="diff-new">Neil Soiffer, Olaf Hoffmann,</ins> Olav Junker Kjær, <ins class="diff-new">Oliver Hunt, Peter Karlsson,</ins> Peter Kasting, Philip Taylor, <ins class="diff-new">Philip TAYLOR,</ins> Rachid Finge, Rajas Moonka, <ins class="diff-new">Ralf Stoltze,</ins> Ralph Giles, <ins class="diff-new">Raphael Champeimont, Rene Saarsoo, Richard Ishida,</ins> Rimantas Liubertas, Robert <ins class= "diff-new">Blaut, Robert</ins> O'Callahan, Robert Sayre, Roman Ivanov, S. Mike Dierken, Sam Ruby, Sam Weinig, Scott Hess, Sean Knapp, Shaun Inman, Silvia Pfeiffer, Simon Pieters, Stefan Haustein, Stephen Ma, Steve <ins class="diff-new">Faulkner, Steve</ins> Runyon, Steven Garrity, Stewart Brodie, Stuart Parmenter, <ins class="diff-new">Sunava Dutta,</ins> Tantek Çelik, <ins class="diff-new">Terrence Wood,</ins> Thomas Broyer, Thomas O'Connor, Tim Altman, <ins class="diff-new">Tim Johansson,</ins> Tyler Close, Vladimir Vukićević, Wakaba, <ins class= "diff-new">Wayne Pollock,</ins> William Swanson, <ins class= "diff-new">Yi-An Huang, and</ins> Øistein E. Andersen, <del class= "diff-old">and everyone on the WHATWG mailing list</del> for their useful and substantial comments. <ins class="diff-new">Thanks also to everyone who has ever posted about HTML5 to their blogs, public mailing lists, or forums, including the</ins> <a href= "http://lists.w3.org/Archives/Public/public-html/"><ins class= "diff-new">W3C public-html list</ins></a> <ins class="diff-new">and the</ins> <a href="http://www.whatwg.org/mailing-list"><ins class= "diff-new">various WHATWG lists</ins></a> . Special thanks to Richard Williamson for creating the first implementation of <code><a href="#canvas">canvas</a></code> in Safari, from which the canvas feature was designed. Special thanks also to the Microsoft employees who first implemented the event-based drag-and-drop mechanism, <code title= "attr-contenteditable"><a href= "#contenteditable0">contenteditable</a></code> , and other features first widely deployed by the Windows Internet Explorer browser. Special thanks and $10,000 to David Hyatt who came up with a broken implementation of the <a href="#adoptionAgency">adoption agency algorithm</a> that the editor had to reverse engineer and fix before using it in the parsing section. Thanks <ins class="diff-new">to the many sources that provided inspiration for the examples used in the specification.</ins> <ins class="diff-new">Thanks</ins> also <ins class= "diff-new">to</ins> the Microsoft blogging community for some ideas, to the attendees of the W3C Workshop on Web Applications and Compound Documents for inspiration, and to the #mrt crew, the #mrt.no crew, <ins class="diff-new">the #whatwg crew,</ins> and the cabal for their ideas and support. </body> </html>