Annotation of html5/spec/interactive-elements.html, revision 1.858
1.2 mike 1: <!DOCTYPE HTML>
1.252 mike 2: <!-- when publishing, change bits marked ZZZ --><html lang="en-US-x-Hixie"><head><title>4.11 Interactive elements — HTML 5</title><style type="text/css">
1.1 mike 3: pre { margin-left: 2em; white-space: pre-wrap; }
4: h2 { margin: 3em 0 1em 0; }
5: h3 { margin: 2.5em 0 1em 0; }
6: h4 { margin: 2.5em 0 0.75em 0; }
7: h5, h6 { margin: 2.5em 0 1em; }
8: h1 + h2, h1 + h2 + h2 { margin: 0.75em 0 0.75em; }
9: h2 + h3, h3 + h4, h4 + h5, h5 + h6 { margin-top: 0.5em; }
10: p { margin: 1em 0; }
11: hr:not(.top) { display: block; background: none; border: none; padding: 0; margin: 2em 0; height: auto; }
12: dl, dd { margin-top: 0; margin-bottom: 0; }
13: dt { margin-top: 0.75em; margin-bottom: 0.25em; clear: left; }
14: dt + dt { margin-top: 0; }
15: dd dt { margin-top: 0.25em; margin-bottom: 0; }
16: dd p { margin-top: 0; }
17: dd dl + p { margin-top: 1em; }
18: dd table + p { margin-top: 1em; }
19: p + * > li, dd li { margin: 1em 0; }
20: dt, dfn { font-weight: bold; font-style: normal; }
21: dt dfn { font-style: italic; }
22: pre, code { font-size: inherit; font-family: monospace; font-variant: normal; }
23: pre strong { color: black; font: inherit; font-weight: bold; background: yellow; }
24: pre em { font-weight: bolder; font-style: normal; }
25: @media screen { code { color: orangered; } code :link, code :visited { color: inherit; } }
26: var sub { vertical-align: bottom; font-size: smaller; position: relative; top: 0.1em; }
27: table { border-collapse: collapse; border-style: hidden hidden none hidden; }
28: table thead { border-bottom: solid; }
29: table tbody th:first-child { border-left: solid; }
1.469 mike 30: table tbody th { text-align: left; }
1.1 mike 31: table td, table th { border-left: solid; border-right: solid; border-bottom: solid thin; vertical-align: top; padding: 0.2em; }
32: blockquote { margin: 0 0 0 2em; border: 0; padding: 0; font-style: italic; }
33:
34: .bad, .bad *:not(.XXX) { color: gray; border-color: gray; background: transparent; }
35: .matrix, .matrix td { border: none; text-align: right; }
36: .matrix { margin-left: 2em; }
37: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
38: .dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
39: .dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
40:
41: .toc dfn, h1 dfn, h2 dfn, h3 dfn, h4 dfn, h5 dfn, h6 dfn { font: inherit; }
42: img.extra { float: right; }
43: pre.idl { border: solid thin; background: #EEEEEE; color: black; padding: 0.5em 1em; }
44: pre.idl :link, pre.idl :visited { color: inherit; background: transparent; }
45: pre.css { border: solid thin; background: #FFFFEE; color: black; padding: 0.5em 1em; }
46: pre.css:first-line { color: #AAAA50; }
1.834 mike 47: dl.domintro { color: green; margin: 2em 0 2em 2em; padding: 0.5em 1em; border: none; background: #DDFFDD; }
1.1 mike 48: hr + dl.domintro, div.impl + dl.domintro { margin-top: 2.5em; margin-bottom: 1.5em; }
49: dl.domintro dt, dl.domintro dt * { color: black; text-decoration: none; }
50: dl.domintro dd { margin: 0.5em 0 1em 2em; padding: 0; }
51: dl.domintro dd p { margin: 0.5em 0; }
52: dl.switch { padding-left: 2em; }
53: dl.switch > dt { text-indent: -1.5em; }
54: dl.switch > dt:before { content: '\21AA'; padding: 0 0.5em 0 0; display: inline-block; width: 1em; text-align: right; line-height: 0.5em; }
55: dl.triple { padding: 0 0 0 1em; }
56: dl.triple dt, dl.triple dd { margin: 0; display: inline }
57: dl.triple dt:after { content: ':'; }
58: dl.triple dd:after { content: '\A'; white-space: pre; }
59: .diff-old { text-decoration: line-through; color: silver; background: transparent; }
60: .diff-chg, .diff-new { text-decoration: underline; color: green; background: transparent; }
61: a .diff-new { border-bottom: 1px blue solid; }
62:
63: h2 { page-break-before: always; }
64: h1, h2, h3, h4, h5, h6 { page-break-after: avoid; }
65: h1 + h2, hr + h2.no-toc { page-break-before: auto; }
66:
67: p > span:not([title=""]):not([class="XXX"]):not([class="impl"]), li > span:not([title=""]):not([class="XXX"]):not([class="impl"]) { border-bottom: solid #9999CC; }
68:
69: div.head { margin: 0 0 1em; padding: 1em 0 0 0; }
70: div.head p { margin: 0; }
71: div.head h1 { margin: 0; }
72: div.head .logo { float: right; margin: 0 1em; }
73: div.head .logo img { border: none } /* remove border from top image */
74: div.head dl { margin: 1em 0; }
1.665 mike 75: div.head p.copyright, div.head p.alt { font-size: x-small; font-style: oblique; margin: 0; }
1.1 mike 76:
77: body > .toc > li { margin-top: 1em; margin-bottom: 1em; }
78: body > .toc.brief > li { margin-top: 0.35em; margin-bottom: 0.35em; }
79: body > .toc > li > * { margin-bottom: 0.5em; }
80: body > .toc > li > * > li > * { margin-bottom: 0.25em; }
81: .toc, .toc li { list-style: none; }
82:
83: .brief { margin-top: 1em; margin-bottom: 1em; line-height: 1.1; }
84: .brief li { margin: 0; padding: 0; }
85: .brief li p { margin: 0; padding: 0; }
86:
87: .category-list { margin-top: -0.75em; margin-bottom: 1em; line-height: 1.5; }
88: .category-list::before { content: '\21D2\A0'; font-size: 1.2em; font-weight: 900; }
89: .category-list li { display: inline; }
90: .category-list li:not(:last-child)::after { content: ', '; }
91: .category-list li > span, .category-list li > a { text-transform: lowercase; }
92: .category-list li * { text-transform: none; } /* don't affect <code> nested in <a> */
93:
94: .XXX { color: #E50000; background: white; border: solid red; padding: 0.5em; margin: 1em 0; }
95: .XXX > :first-child { margin-top: 0; }
96: p .XXX { line-height: 3em; }
1.153 mike 97: .annotation { border: solid thin black; background: #0C479D; color: white; position: relative; margin: 8px 0 20px 0; }
98: .annotation:before { position: absolute; left: 0; top: 0; width: 100%; height: 100%; margin: 6px -6px -6px 6px; background: #333333; z-index: -1; content: ''; }
99: .annotation :link, .annotation :visited { color: inherit; }
100: .annotation :link:hover, .annotation :visited:hover { background: transparent; }
101: .annotation span { border: none ! important; }
1.1 mike 102: .note { color: green; background: transparent; font-family: sans-serif; }
103: .warning { color: red; background: transparent; }
104: .note, .warning { font-weight: bolder; font-style: italic; }
105: p.note, div.note { padding: 0.5em 2em; }
106: span.note { padding: 0 2em; }
107: .note p:first-child, .warning p:first-child { margin-top: 0; }
108: .note p:last-child, .warning p:last-child { margin-bottom: 0; }
109: .warning:before { font-style: normal; }
110: p.note:before { content: 'Note: '; }
111: p.warning:before { content: '\26A0 Warning! '; }
112:
113: .bookkeeping:before { display: block; content: 'Bookkeeping details'; font-weight: bolder; font-style: italic; }
114: .bookkeeping { font-size: 0.8em; margin: 2em 0; }
115: .bookkeeping p { margin: 0.5em 2em; display: list-item; list-style: square; }
116:
117: h4 { position: relative; z-index: 3; }
118: h4 + .element, h4 + div + .element { margin-top: -2.5em; padding-top: 2em; }
119: .element {
120: background: #EEEEFF;
121: color: black;
122: margin: 0 0 1em 0.15em;
123: padding: 0 1em 0.25em 0.75em;
124: border-left: solid #9999FF 0.25em;
125: position: relative;
126: z-index: 1;
127: }
128: .element:before {
129: position: absolute;
130: z-index: 2;
131: top: 0;
132: left: -1.15em;
133: height: 2em;
134: width: 0.9em;
135: background: #EEEEFF;
136: content: ' ';
137: border-style: none none solid solid;
138: border-color: #9999FF;
139: border-width: 0.25em;
140: }
141:
1.143 mike 142: .example { display: block; color: #222222; background: #FCFCFC; border-left: double; margin-left: 2em; padding-left: 1em; }
143: td > .example:only-child { margin: 0 0 0 0.1em; }
1.1 mike 144:
145: .tall-and-narrow {
146: font-size: 0.6em;
147: column-width: 25em;
148: column-gap: 1em;
149: -moz-column-width: 25em;
150: -moz-column-gap: 1em;
151: -webkit-column-width: 25em;
152: -webkit-column-gap: 1em;
153: }
154:
155: ul.domTree, ul.domTree ul { padding: 0 0 0 1em; margin: 0; }
156: ul.domTree li { padding: 0; margin: 0; list-style: none; position: relative; }
157: ul.domTree li li { list-style: none; }
158: ul.domTree li:first-child::before { position: absolute; top: 0; height: 0.6em; left: -0.75em; width: 0.5em; border-style: none none solid solid; content: ''; border-width: 0.1em; }
159: ul.domTree li:not(:last-child)::after { position: absolute; top: 0; bottom: -0.6em; left: -0.75em; width: 0.5em; border-style: none none solid solid; content: ''; border-width: 0.1em; }
160: ul.domTree span { font-style: italic; font-family: serif; }
161: ul.domTree .t1 code { color: purple; font-weight: bold; }
162: ul.domTree .t2 { font-style: normal; font-family: monospace; }
163: ul.domTree .t2 .name { color: black; font-weight: bold; }
164: ul.domTree .t2 .value { color: blue; font-weight: normal; }
165: ul.domTree .t3 code, .domTree .t4 code, .domTree .t5 code { color: gray; }
166: ul.domTree .t7 code, .domTree .t8 code { color: green; }
167: ul.domTree .t10 code { color: teal; }
168:
1.730 mike 169: body.dfnEnabled dfn { cursor: pointer; }
170: .dfnPanel {
171: display: inline;
172: position: absolute;
173: z-index: 10;
174: height: auto;
175: width: auto;
176: padding: 0.5em 0.75em;
177: font: small sans-serif, Droid Sans Fallback;
178: background: #DDDDDD;
179: color: black;
180: border: outset 0.2em;
181: }
182: .dfnPanel * { margin: 0; padding: 0; font: inherit; text-indent: 0; }
183: .dfnPanel :link, .dfnPanel :visited { color: black; }
184: .dfnPanel p { font-weight: bolder; }
185: .dfnPanel * + p { margin-top: 0.25em; }
186: .dfnPanel li { list-style-position: inside; }
187:
1.665 mike 188: #configUI { position: absolute; z-index: 20; top: 10em; right: 1em; width: 11em; font-size: small; }
189: #configUI p { margin: 0.5em 0; padding: 0.3em; background: #EEEEEE; color: black; border: inset thin; }
190: #configUI p label { display: block; }
191: #configUI #updateUI, #configUI .loginUI { text-align: center; }
192: #configUI input[type=button] { display: block; margin: auto; }
1.261 mike 193: </style><style type="text/css">
194:
1.286 mike 195: .applies thead th > * { display: block; }
196: .applies thead code { display: block; }
197: .applies tbody th { whitespace: nowrap; }
198: .applies td { text-align: center; }
199: .applies .yes { background: yellow; }
200:
1.261 mike 201: .matrix, .matrix td { border: none; text-align: right; }
202: .matrix { margin-left: 2em; }
203:
204: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
205: .dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
206: .dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
207:
208: #table-example-1 { border: solid thin; border-collapse: collapse; margin-left: 3em; }
209: #table-example-1 * { font-family: "Essays1743", serif; line-height: 1.01em; }
210: #table-example-1 caption { padding-bottom: 0.5em; }
211: #table-example-1 thead, #table-example-1 tbody { border: none; }
212: #table-example-1 th, #table-example-1 td { border: solid thin; }
213: #table-example-1 th { font-weight: normal; }
214: #table-example-1 td { border-style: none solid; vertical-align: top; }
215: #table-example-1 th { padding: 0.5em; vertical-align: middle; text-align: center; }
216: #table-example-1 tbody tr:first-child td { padding-top: 0.5em; }
217: #table-example-1 tbody tr:last-child td { padding-bottom: 1.5em; }
218: #table-example-1 tbody td:first-child { padding-left: 2.5em; padding-right: 0; width: 9em; }
219: #table-example-1 tbody td:first-child::after { content: leader(". "); }
220: #table-example-1 tbody td { padding-left: 2em; padding-right: 2em; }
221: #table-example-1 tbody td:first-child + td { width: 10em; }
222: #table-example-1 tbody td:first-child + td ~ td { width: 2.5em; }
223: #table-example-1 tbody td:first-child + td + td + td ~ td { width: 1.25em; }
224:
225: .apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
226: .apple-table-examples * { font-family: "Times", serif; }
227: .apple-table-examples td, .apple-table-examples th { border: none; white-space: nowrap; padding-top: 0; padding-bottom: 0; }
228: .apple-table-examples tbody th:first-child { border-left: none; width: 100%; }
229: .apple-table-examples thead th:first-child ~ th { font-size: smaller; font-weight: bolder; border-bottom: solid 2px; text-align: center; }
230: .apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
231: .apple-table-examples tbody th, .apple-table-examples tfoot th { font: inherit; text-align: left; }
232: .apple-table-examples td { text-align: right; vertical-align: top; }
233: .apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
234: .apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
235: .apple-table-examples.e2 th[scope=row] { padding-left: 1em; }
236: .apple-table-examples sup { line-height: 0; }
237:
1.718 mike 238: .details-example img { vertical-align: top; }
239:
1.834 mike 240: </style><style>
241: .domintro:before { display: table; margin: -1em -0.5em -0.5em auto; width: auto; content: 'This box is non-normative. Implementation requirements are given below this box.'; color: red; border: solid 2px; background: white; padding: 0 0.25em; }
242: </style><link href="data:text/css," id="complete" rel="stylesheet" title="Complete specification"><link href="data:text/css,.impl%20%7B%20display:%20none;%20%7D%0Ahtml%20%7B%20border:%20solid%20yellow;%20%7D%20.domintro:before%20%7B%20display:%20none;%20%7D" id="author" rel="alternate stylesheet" title="Author documentation only"><link href="data:text/css,.impl%20%7B%20background:%20%23FFEEEE;%20%7D" id="highlight" rel="alternate stylesheet" title="Highlight implementation requirements"><script type="text/javascript">
1.665 mike 243: function getCookie(name) {
244: var params = location.search.substr(1).split("&");
245: for (var index = 0; index < params.length; index++) {
246: if (params[index] == name)
247: return "1";
248: var data = params[index].split("=");
249: if (data[0] == name)
250: return unescape(data[1]);
251: }
252: var cookies = document.cookie.split("; ");
253: for (var index = 0; index < cookies.length; index++) {
254: var data = cookies[index].split("=");
255: if (data[0] == name)
256: return unescape(data[1]);
257: }
258: return null;
259: }
260: function load(script) {
261: var e = document.createElement('script');
262: e.setAttribute('src', 'http://www.whatwg.org/specs/web-apps/current-work/' + script + '?' + encodeURIComponent(location) + '&' + encodeURIComponent(document.referrer));
263: document.body.appendChild(e);
264: }
265: function init() {
266: if (location.search == '?slow-browser')
267: return;
268: var configUI = document.createElement('div');
269: configUI.id = 'configUI';
270: document.body.appendChild(configUI);
271: // load('reviewer.js'); // would need cross-site XHR
272: if (document.getElementById('head'))
273: load('toc.js');
274: load('styler.js');
275: // load('updater.js'); // would need cross-site XHR
1.718 mike 276: load('dfn.js'); // doesn't support split-out specs, but, oh well.
1.665 mike 277: // load('status.js'); // would need cross-site XHR
278: if (getCookie('profile') == '1')
279: document.getElementsByTagName('h2')[0].textContent += '; load: ' + (new Date() - loadTimer) + 'ms';
280: fixBrokenLink();
281: }
1.802 mike 282: </script><link href="http://www.w3.org/StyleSheets/TR/W3C-WD" rel="stylesheet" type="text/css">
1.2 mike 283: <script src="link-fixup.js"></script>
284: <link href="forms.html" title="4.10 Forms" rel="prev">
285: <link href="spec.html#contents" title="Table of contents" rel="index">
1.749 mike 286: <link href="browsers.html" title="5 Loading Web pages" rel="next">
1.665 mike 287: </head><body onload="fixBrokenLink(); init()"><div class="head" id="head">
1.1 mike 288: <p><a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a></p>
1.177 mike 289: <h1>HTML5</h1>
1.1 mike 290: <h2 class="no-num no-toc" id="a-vocabulary-and-associated-apis-for-html-and-xhtml">A vocabulary and associated APIs for HTML and XHTML</h2>
1.117 mike 291: </div><nav>
1.1 mike 292: <a href="forms.html">← 4.10 Forms</a> –
1.2 mike 293: <a href="spec.html#contents">Table of contents</a> –
1.749 mike 294: <a href="browsers.html">5 Loading Web pages →</a>
1.858 ! mike 295: </nav><p>This is revision 1.3860.</p>
1.653 mike 296:
1.1 mike 297:
1.765 mike 298: <h3 id="interactive-elements"><span class="secno">4.11 </span>Interactive elements</h3><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><h4 id="the-details-element"><span class="secno">4.11.1 </span>The <dfn><code>details</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments. </i><span><a href="http://www.w3.org/html/wg/tracker/issues/93">ISSUE-93</a> (details) blocks progress to Last Call</span></p><dl class="element"><dt>Categories</dt>
1.153 mike 299: <dd><a href="dom.html#flow-content">Flow content</a>.</dd>
1.518 mike 300: <dd><a href="semantics.html#sectioning-root">Sectioning root</a>.</dd>
1.153 mike 301: <dd><a href="embedded-content-0.html#interactive-content">Interactive content</a>.</dd>
1.1 mike 302: <dt>Contexts in which this element may be used:</dt>
1.153 mike 303: <dd>Where <a href="dom.html#flow-content">flow content</a> is expected.</dd>
1.1 mike 304: <dt>Content model:</dt>
1.729 mike 305: <dd>One <code><a href="#the-summary-element">summary</a></code> element followed by <a href="dom.html#flow-content">flow content</a>.</dd>
1.1 mike 306: <dt>Content attributes:</dt>
307: <dd><a href="dom.html#global-attributes">Global attributes</a></dd>
308: <dd><code title="attr-details-open"><a href="#attr-details-open">open</a></code></dd>
309: <dt>DOM interface:</dt>
310: <dd>
311: <pre class="idl">interface <dfn id="htmldetailselement">HTMLDetailsElement</dfn> : <a href="dom.html#htmlelement">HTMLElement</a> {
312: attribute boolean <a href="#dom-details-open" title="dom-details-open">open</a>;
313: };</pre>
314: </dd>
1.307 mike 315: </dl><p>The <code><a href="#the-details-element">details</a></code> element <a href="the-xhtml-syntax.html#represents">represents</a> a
316: disclosure widget from which the user can obtain additional
317: information or controls.</p><p class="note">The <code><a href="#the-details-element">details</a></code> element is not appropriate
1.299 mike 318: for footnotes. Please see <a href="#footnotes">the section on
1.729 mike 319: footnotes</a> for details on how to mark up footnotes.</p><p>The <span class="impl">first</span> <code><a href="#the-summary-element">summary</a></code> element
320: child of the element, if any, <a href="the-xhtml-syntax.html#represents">represents</a> the summary or
321: legend of the details. <span class="impl">If there is no child
322: <code><a href="#the-summary-element">summary</a></code> element, the user agent should provide its own
323: legend (e.g. "Details").</span></p><p>The <dfn id="attr-details-open" title="attr-details-open"><code>open</code></dfn>
1.1 mike 324: content attribute is a <a href="infrastructure.html#boolean-attribute">boolean attribute</a>. If present,
325: it indicates that the details are to be shown to the user. If the
1.117 mike 326: attribute is absent, the details are not to be shown.</p><div class="impl">
1.1 mike 327:
328: <p>If the attribute is removed, then the details should be
329: hidden. If the attribute is added, the details should be shown.</p>
330:
331: <p>The user agent should allow the user to request that the details
332: be shown or hidden. To honor a request for the details to be shown,
333: the user agent must set the <code title="attr-details-open"><a href="#attr-details-open">open</a></code> attribute on the element to
334: the value <code title="">open</code>. To honor a request for the
335: details to be hidden, the user agent must remove the <code title="attr-details-open"><a href="#attr-details-open">open</a></code> attribute from the
336: element.</p>
337:
338: <p>The <dfn id="dom-details-open" title="dom-details-open"><code>open</code></dfn>
339: attribute must <a href="infrastructure.html#reflect">reflect</a> the <code title="attr-details-open"><a href="#attr-details-open">open</a></code> content attribute.</p>
340:
1.271 mike 341: </div><div class="example">
342:
343: <p>The following example shows the <code><a href="#the-details-element">details</a></code> element
344: being used to hide technical details in a progress report.</p>
345:
346: <pre><section class="progress window">
347: <h1>Copying "Really Achieving Your Childhood Dreams"</h1>
348: <details>
1.729 mike 349: <summary>Copying... <progress max="375505392" value="97543282"></progress> 25%</summary>
350: <dl>
351: <dt>Transfer rate:</dt> <dd>452KB/s</dd>
352: <dt>Local filename:</dt> <dd>/home/rpausch/raycd.m4v</dd>
353: <dt>Remote filename:</dt> <dd>/var/www/lectures/raycd.m4v</dd>
354: <dt>Duration:</dt> <dd>01:16:27</dd>
355: <dt>Color profile:</dt> <dd>SD (6-1-6)</dd>
356: <dt>Dimensions:</dt> <dd>320×240</dd>
357: </dl>
1.271 mike 358: </details>
359: </section></pre>
360:
1.718 mike 361: </div><div class="example">
362:
363: <p>The following shows how a <code><a href="#the-details-element">details</a></code> element can be
364: used to hide some controls by default:</p>
365:
366: <pre><details>
1.729 mike 367: <summary>Name & Extension:</summary>
368: <p><input type=text name=fn value="Pillar Magazine.pdf">
369: <p><label><input type=checkbox name=ext checked> Hide extension</label>
1.718 mike 370: </details></pre>
371:
372: <p>One could use this in conjuction with other <code><a href="#the-details-element">details</a></code>
373: in a list to allow the user to collapse a set of fields down to a
374: small set of headings, with the ability to open each one.</p>
375:
376: <p class="details-example"><img alt="" src="http://dev.w3.org/html5/spec/images/sample-details-1.png"><img alt="" src="http://dev.w3.org/html5/spec/images/sample-details-2.png"></p>
377:
1.729 mike 378: <p>In these examples, the summary really just summarises what the
379: controls can change, and not the actual values, which is less than
380: ideal.</p>
381:
382: </div><h4 id="the-summary-element"><span class="secno">4.11.2 </span>The <dfn><code>summary</code></dfn> element</h4><dl class="element"><dt>Categories</dt>
383: <dd>None.</dd>
384: <dt>Contexts in which this element may be used:</dt>
385: <dd>As the first child of a <code><a href="#the-details-element">details</a></code> element.</dd>
386: <dt>Content model:</dt>
387: <dd><a href="dom.html#phrasing-content">Phrasing content</a>.</dd>
388: <dt>Content attributes:</dt>
389: <dd><a href="dom.html#global-attributes">Global attributes</a></dd>
390: <dt>DOM interface:</dt>
391: <dd>Uses <code><a href="dom.html#htmlelement">HTMLElement</a></code>.</dd>
392: </dl><p>The <code><a href="#the-summary-element">summary</a></code> element <a href="the-xhtml-syntax.html#represents">represents</a> a
393: summary, caption, or legend for the rest of the contents of the
394: <code><a href="#the-summary-element">summary</a></code> element's parent <code><a href="#the-details-element">details</a></code>
395: element<span class="impl">, if any</span>.</p><!-- v2DATAGRID
1.80 mike 396: <h4 id="datagrid">The <dfn><code>datagrid</code></dfn> element</h4>
397:
398: <dl class="element">
399: <dt>Categories</dt>
400: <dd><span>Flow content</span>.</dd>
401: <dd><span>Interactive content</span>.</dd>
402: <dd><span>Sectioning root</span>.</dd>
1.1 mike 403: <dt>Contexts in which this element may be used:</dt>
1.80 mike 404: <dd>Where <span>flow content</span> is expected.</dd>
1.1 mike 405: <dt>Content model:</dt>
1.80 mike 406: <dd><span>Flow content</span>.</dd>
1.1 mike 407: <dt>Content attributes:</dt>
1.80 mike 408: <dd><span>Global attributes</span></dd>
409: <!- -v2DGS:
1.1 mike 410: <dd><code title="attr-datagrid-multiple">multiple</code></dd>
1.80 mike 411: - ->
412: <dd><code title="attr-datagrid-disabled">disabled</code></dd>
1.1 mike 413: <dt>DOM interface:</dt>
414: <dd>
1.80 mike 415: <pre class="idl">interface <dfn>HTMLDataGridElement</dfn> : <span>HTMLElement</span> {
416: <!- -v2DGS:
1.1 mike 417: attribute boolean <span title="dom-datagrid-multiple">multiple</span>;
1.80 mike 418: - -> attribute boolean <span title="dom-datagrid-disabled">disabled</span>;
419: attribute <span>DataGridListener</span> <span title="dom-datagrid-listener">listener</span>;
420: <!- - v2DGS:
1.1 mike 421: readonly attribute <span>DataGridSelection</span> <span title="dom-datagrid-selection">selection</span>;
1.80 mike 422: - ->
1.1 mike 423: // columns
1.395 mike 424: void <span title="dom-datagrid-addColumn">addColumn</span>(in <span>Column</span> id, in DOMString label, in DOMString type, in optional HTMLImageElement icon, in optional boolean sortable, in optional boolean hidden);
1.80 mike 425: attribute DOMString <span title="dom-datagrid-sortColumn">sortColumn</span>;
426: attribute boolean <span title="dom-datagrid-sortAscending">sortAscending</span>;
427: void <span title="dom-datagrid-clearColumns">clearColumns</span>();
1.1 mike 428:
429: // rows
1.80 mike 430: void <span title="dom-datagrid-renotify">renotify</span>();
431: void <span title="dom-datagrid-setRowCount">setRowCount</span>(in long childCount, in long rowCount);
432: void <span title="dom-datagrid-setRows">setRows</span>(in <span>RowList</span> rows);
433: void <span title="dom-datagrid-insertRows">insertRows</span>(in <span>RowList</span> rows);
434: void <span title="dom-datagrid-deleteRows">deleteRows</span>(in <span>RowIDList</span> rows);
435: void <span title="dom-datagrid-repaint">repaint</span>(in <span>RowID</span> row, in DOMString column);
436: void <span title="dom-datagrid-clearRows">clearRows</span>();
437: <!- -
1.1 mike 438: v2: opening and closing a row
439: moving a row's actual ID
440: - imagine new mail moving a thread up; you just want to add the new mail to the thread and move the thread's first mail to the top
441: - though actually that should probably just be done using display sorting
1.80 mike 442: - ->
1.1 mike 443: };
444:
1.80 mike 445: typedef DOMString <dfn>Column</dfn>;
446: typedef sequence<<span>Column</span>> <dfn>ColumnList</dfn>;
1.81 mike 447: typedef sequence<any> <dfn>Cell</dfn>; // <span>Column</span>, any... (exact types expected depend on the column type)
1.80 mike 448: typedef sequence<<span>Cell</span>> <dfn>CellList</dfn>;
1.81 mike 449: typedef sequence<any> <dfn>Row</dfn>; // <span>RowID</span>, long, long, <span>CellList</span>, optional boolean, optional long
1.80 mike 450: typedef sequence<<span>Row</span>> <dfn>RowList</dfn>;
451: typedef sequence<unsigned long> <dfn>RowID</dfn>;
452: typedef sequence<<span>RowID</span>> <dfn>RowIDList</dfn>;
1.1 mike 453:
454: [Callback=FunctionOnly, NoInterfaceObject]
1.80 mike 455: interface <dfn>RenderingContext2DCallback</dfn> {
456: DOMString <span title="dom-Rendering2DContextCallback-handleEvent">handleEvent</span>(in <span>CanvasRenderingContext2D</span> context, in unsigned long width, in unsigned long height);
1.1 mike 457: };</pre>
458: </dd>
1.80 mike 459: </dl>
460:
461: <!- - v2:
462: * datagrid: cells that are links (<a href=""></a>)
463: - ->
464:
465: <p>The <code>datagrid</code> element <span>represents</span> an
466: interactive representation of tree, list, or tabular data.</p>
467:
468: <p>The data being presented is provided by script using the methods
469: described in the following sections.</p>
470:
471: <!- -v2DGS:
1.1 mike 472: <p>The <dfn
473: title="attr-datagrid-multiple"><code>multiple</code></dfn> attribute
474: is a <span>boolean attribute</span>. When set, it indicates that the
475: user can select more than one row at a time.</p>
1.80 mike 476: - ->
477:
478: <p>The <dfn
479: title="attr-datagrid-disabled"><code>disabled</code></dfn> attribute
480: is a <span>boolean attribute</span> used to disable the
1.1 mike 481: control. <span class="impl">When the attribute is set, the user
1.80 mike 482: agent must disable the <code>datagrid</code>, preventing the user
483: from interacting with it. The <code>datagrid</code> element should
1.1 mike 484: still continue to update itself when the underlying data changes,
485: though, as described in the next few sections. However, conformance
1.80 mike 486: requirements stating that <code>datagrid</code> elements must react
1.1 mike 487: to users in particular ways do not apply when the
1.80 mike 488: <code>datagrid</code> is disabled.</span></p>
489:
490: <div class="impl">
1.1 mike 491:
1.80 mike 492: <!- -vsDGS: multiple - ->
1.1 mike 493:
1.80 mike 494: <p>The <dfn
1.186 mike 495: title="dom-datagrid-disabled"><code>disabled</code></dfn> IDL
1.80 mike 496: attribute must <span>reflect</span> the content attribute of the
1.1 mike 497: same name.</p>
498:
1.80 mike 499: </div>
500:
501: <!- - v2DGPA: One possible thing to be added is a way to detect when a
1.1 mike 502: row/selection has been deleted, activated, etc, by the user (delete
1.80 mike 503: key, enter key, etc). (v2DGPA = <datagrid> Perform Action) - ->
504:
505:
506: <h5>Introduction</h5>
507:
508: <p><i>This section is non-normative.</i></p>
509:
510: <p>In the <code>datagrid</code> data model, data is structured as a
1.1 mike 511: set of rows representing a tree, each row being split into a number
512: of columns. The columns are always present in the data model,
1.80 mike 513: although individual columns might be hidden in the presentation.</p>
514:
515: <hr>
516:
517: <p>Each row can have child rows. Child rows may be hidden or
518: shown, by closing or opening (respectively) the parent row.</p>
519:
520: <p>Rows are referred to by the path along the tree that one would
1.1 mike 521: take to reach the row, using zero-based indices. Thus, the first row
522: of a list is row "0", the second row is row "1"; the first child row
523: of the first row is row "0,0", the second child row of the first row
524: is row "0,1"; the fourth child of the seventh child of the third
1.80 mike 525: child of the tenth row is "9,2,6,3", etc.</p>
526:
527: <p>The chains of numbers that give a row's path, or identifier, are
1.1 mike 528: represented by arrays of positions, represented in IDL by the
1.80 mike 529: <span>RowID</span> interface.</p>
530:
531: <p>The root of the tree is represented by an empty array.</p>
532:
533: <hr>
534:
535: <p>Each column has a string that is used to identify it in the API,
1.1 mike 536: a label that is shown to users interacting with the column, a type,
1.80 mike 537: and optionally an icon.</p>
538:
539: <p>The possible types are as follows:</p>
540:
541: <table>
542: <thead>
543: <tr>
544: <td>Keyword
545: <td>Description
546: <tbody>
547: <tr>
548: <td><code title="datagrid-type-text">text</code>
549: <td>Simple text.
550: <tr>
551: <td><code title="datagrid-type-editable">editable</code>
552: <td>Editable text.
553: <tr>
554: <td><code title="datagrid-type-checkable">checkable</code>
555: <td>Text with a check box.
556: <tr>
557: <td><code title="datagrid-type-list">list</code>
558: <td>A list of values that the user can switch between.
559: <tr>
560: <td><code title="datagrid-type-progress">progress</code>
561: <td>A progress bar.
562: <tr>
563: <td><code title="datagrid-type-meter">meter</code>
564: <td>A gauge.
565: <tr>
566: <td><code title="datagrid-type-custom">custom</code>
567: <td>A canvas onto which arbitrary content can be drawn.
568: </table>
569:
570: <p>Each column can be flagged as sortable, in which case the user
571: will be able to sort the view using that column.</p>
572:
573: <p>Columns are not necessarily visible. A column can be created
1.1 mike 574: invisible by default. The user can select which columns are to be
1.80 mike 575: shown.</p>
576:
577: <p>When no columns have been added to the <code>datagrid</code>, a
1.1 mike 578: column with no name, whose identifier is the empty string, whose
1.80 mike 579: type is <code title="datagrid-type-text">text</code>, and which is
1.1 mike 580: not sortable, is implied. This column is removed if any explicit
1.80 mike 581: columns are declared.</p>
582:
583: <p>Each cell uses the type given for its column, so all cells in a
584: column present the same type of information.</p>
585:
586: <!- -v2DGS:
1.1 mike 587: <p>Selection of data in a <code>datagrid</code> operates at the row
588: level. If the <code title="attr-datagrid-multiple">multiple</code>
589: attribute is present, multiple rows can be selected at once,
590: otherwise the user can only select one row at a time.</p>
1.80 mike 591: - ->
592:
593: <!- - v2DGDND: selection should draggable to and from datagrids - ->
594:
595:
596: <h6>Example: a <code>datagrid</code> backed by a static <code>table</code> element</h6>
597:
598: ...
599:
600:
601: <h6>Example: a <code>datagrid</code> backed by nested <code>ol</code> elements</h6>
602:
603: ...
604:
605:
606: <h6>Example: a <code>datagrid</code> backed by a server</h6>
607:
608: ...
609:
610:
611: <h5>Populating the <code>datagrid</code></h5>
612:
613: <dl class="domintro">
614:
615: <dt><var title="">datagrid</var> . <code title="dom-datagrid-listener">listener</code> [ = <var title="">value</var> ]</dt>
1.1 mike 616: <dd>
617:
618: <p>Return the current object that is configured as the
1.80 mike 619: <code>datagrid</code> listener, if any. Returns null if there is
1.1 mike 620: none.</p>
621:
622: <p>The listener is an object provided by the script author that
1.80 mike 623: receives notifications when the <code>datagrid</code> needs row
1.1 mike 624: data to render itself, when the user opens and closes rows with
625: children, when the user edits a cell, and when the user invokes a
1.80 mike 626: row's context menu. (The <code>DataGridListener</code> interface
1.1 mike 627: used for this purpose is described in the next section.)</p>
628:
629: <p>Can be set, to change the current listener.</p>
630:
631: </dd>
632:
633:
1.80 mike 634: <dt><var title="">datagrid</var> . <code title="dom-datagrid-renotify">renotify</code>()</dt>
1.1 mike 635: <dd>
636:
1.80 mike 637: <p>Causes the <code>datagrid</code> to resend notifications to the
1.1 mike 638: listener (if any) for any rows or cells that the
1.80 mike 639: <code>datagrid</code> does not yet have information for.</p>
1.1 mike 640:
1.80 mike 641: <!- - useful, e.g., if there is a server error and the script loses
642: track of what rows it's supposed to be reporting. - ->
1.1 mike 643:
644: </dd>
645:
646:
1.80 mike 647: <dt><var title="">datagrid</var> . <code title="dom-datagrid-addColumn">addColumn</code>(<var title="">id</var>, <var title="">label</var>, <var title="">type</var> [, <var title="">icon</var> [, <var title="">sortable</var> [, <var title="">hidden</var> ] ] ] )</dt>
1.1 mike 648: <dd>
649:
1.80 mike 650: <p>Adds a column to the <code>datagrid</code>.</p>
1.1 mike 651:
652: <p>If a column with the given identifier has already been added,
653: it just replaces the information for that column.</p>
654:
655: <p>The possible types are enumerated in the previous section.</p>
656:
657: </dd>
658:
659:
1.80 mike 660: <dt><var title="">datagrid</var> . <code title="dom-datagrid-sortColumn">sortColumn</code> [ = <var title="">value</var> ]</dt>
1.1 mike 661: <dd>
662:
663: <p>Returns the identifier of the column by which the data is to be
664: sorted.</p>
665:
666: <p>Can be set, to indicate that the sort order has changed. This
1.80 mike 667: will cause the <code>datagrid</code> to clear its position
668: information for rows, so <code
669: title="dom-datagrid-setRows">setRows()</code> will have to be
1.1 mike 670: called again with the new sort order.</p>
671:
672: <p>The columns are not actually sorted by the
1.80 mike 673: <code>datagrid</code>; the data has to be sorted by the script
674: that adds the rows to the <code>datagrid</code>.</p>
1.1 mike 675:
676: </dd>
677:
678:
1.80 mike 679: <dt><var title="">datagrid</var> . <code title="dom-datagrid-sortAscending">sortAscending</code> [ = <var title="">value</var> ]</dt>
1.1 mike 680: <dd>
681:
682: <p>Returns true if the data is to be sorted with smaller values
683: first; otherwise, returns false, indicating that bigger values are
684: to be put first.</p>
685:
686: <p>Can be set, to indicate that the order is about to change.</p>
687:
688: </dd>
689:
690:
1.80 mike 691: <dt><var title="">datagrid</var> . <code title="dom-datagrid-clearColumns">clearColumns</code>()</dt>
1.1 mike 692: <dd>
693:
1.80 mike 694: <p>Removes all the columns in the <code>datagrid</code>,
1.1 mike 695: reinstating the implied column.</p>
696:
697: </dd>
698:
699:
1.80 mike 700: <dt><var title="">datagrid</var> . <code title="dom-datagrid-setRowCount">setRowCount</code>(<var title="">childCount</var>, <var title="">rowCount</var>)</dt>
1.1 mike 701: <dd>
702:
1.80 mike 703: <p>Sets the numbers of rows in the <code>datagrid</code>,
1.1 mike 704: excluding rows that are descendants of rows that are closed.</p>
705:
1.80 mike 706: <p>Throws a <code>DATAGRID_MODEL_ERR</code> exception if the
1.1 mike 707: arguments contradict each other or previously declared information
1.80 mike 708: (e.g. declaring that the <code>datagrid</code> has three rows when
1.1 mike 709: the 12th row has been declared).</p>
710:
711: </dd>
712:
713:
1.80 mike 714: <dt><var title="">datagrid</var> . <code title="dom-datagrid-setRows">setRows</code>(<var title="">rows</var>)</dt>
1.1 mike 715: <dd>
716:
1.80 mike 717: <p>Updates data for rows in the <code>datagrid</code>, or fills in
718: data for rows previously implied by a call to <code
719: title="dom-datagrid-setRowCount">setRowCount()</code> but not
1.1 mike 720: previously declared.</p>
721:
722: <p>The <var title="">rows</var> argument is an array of rows, each
723: represented by a further array consisting of:</p>
724:
1.80 mike 725: <ol class="brief">
726:
727: <li>A <code>RowID</code> object identifying the row.</li>
1.1 mike 728:
729: <li>An integer giving the position of the row in its parent,
1.80 mike 730: given the current sort order, or −1 to set other row data
1.1 mike 731: without setting a position or changing a previously declared
732: position.</li>
733:
734: <li>An integer giving the number of children of the row, or 0 if
1.80 mike 735: the row has no children, or −1 if the row has children but
1.1 mike 736: the count is currently unknown. If the number of children has
737: already been set to 0 or a positive integer, then passing
1.80 mike 738: −1 leaves the previous count unchanged.</li>
1.1 mike 739:
740: <li>An array giving the data for zero or more cells in the row,
741: as described below.</li>
742:
743: <li>A boolean declaring whether the row is open or not. This
744: entry, if omitted, is assumed to be false (closed), unless the
745: row has already been declared as open.</li>
746:
747: <li>An integer giving the number of rows that are descendants of
748: this row, excluding those that are descendants of descendants of
749: this row that are closed. This entry can be omitted if the row is
750: closed or if it has already been declared.</li>
751:
1.80 mike 752: </ol>
753:
754: <p>The array giving the data for the cells in the row consists of
1.1 mike 755: a further set of arrays, one per cell. The first item of each of
756: these arrays is the column's identifier; the subsequent values
757: vary based on the type of the column, as follows:</p>
758:
1.80 mike 759: <dl>
760:
761: <dt><code title="datagrid-type-text">text</code></dt>
1.1 mike 762: <dd>
1.80 mike 763: <ol class="brief">
764: <li>A string giving the cell's value.
765: <li>Optionally, an <code>img</code> element giving an icon for the cell.
766: </ol>
767: </dd>
1.1 mike 768:
1.80 mike 769: <dt><code title="datagrid-type-editable">editable</code></dt>
1.1 mike 770: <dd>
1.80 mike 771: <ol class="brief">
772: <li>A string giving the cell's value.
773: <li>Optionally, a <code>datalist</code> element giving a set of predefined options.
774: <li>Optionally, an <code>img</code> element giving an icon for the cell.
775: </ol>
776: </dd>
1.1 mike 777:
1.80 mike 778: <dt><code title="datagrid-type-checkable">checkable</code></dt>
1.1 mike 779: <dd>
1.80 mike 780: <ol class="brief">
781: <li>A string giving the cell's value.
782: <li>A boolean, indicating whether the cell is checked (true) or not (false).
783: <li>Optionally, a boolean indicating whether the value of the cell is obscured as indeterminate (true), or not (false).
784: <li>Optionally, an <code>img</code> element giving an icon for the cell.
785: </ol>
786: </dd>
1.1 mike 787:
1.80 mike 788: <dt><code title="datagrid-type-list">list</code></dt>
1.1 mike 789: <dd>
1.80 mike 790: <ol class="brief">
791: <li>A string giving the cell's current value.
792: <li>A <code>select</code> element giving the <span title="concept-select-option-list">list of options</span>.
793: <li>Optionally, an <code>img</code> element giving an icon for the cell.
794: </ol>
795: </dd>
1.1 mike 796:
1.80 mike 797: <dt><code title="datagrid-type-progress">progress</code></dt>
1.1 mike 798: <dd>
1.80 mike 799: <ol class="brief">
800: <li>A value in the range 0.0 (no progress) to 1.0 (task complete).
801: </ol>
802: </dd>
1.1 mike 803:
1.80 mike 804: <dt><code title="datagrid-type-meter">meter</code></dt>
1.1 mike 805: <dd>
1.80 mike 806: <ol class="brief">
807: <li>A number giving the cell's value.
808: <li>Optionally, a number giving the maximum value, if it's not 1.
809: <li>Optionally, a number giving the minimum value, if it's not 0.
810: <li>Optionally, a number giving the highest value that is considered "low".
811: <li>Optionally, a number giving the lowest value that is considered "high".
812: <li>Optionally, a number giving the value that is considered optimal.
813: </ol>
814: </dd>
1.1 mike 815:
1.80 mike 816: <dt><code title="datagrid-type-custom">custom</code></dt>
1.1 mike 817: <dd>
1.80 mike 818: <ol class="brief">
819: <li>A number giving the minimum width of the cell, in CSS pixels, that is desired.
820: <li>A number giving the minimum height of the cell, in CSS pixels, that is desired.
821: <li>A function that is passed a <code>CanvasRenderingContext2D</code> object, along with the width and height (in CSS pixels) of the cell that the context will draw on.
822: </ol>
823: </dd>
824:
825: </dl>
1.1 mike 826:
1.80 mike 827: <p>While the rows in a single call to the <code
828: title="dom-datagrid-setRows">setRows()</code> method can be in any
1.1 mike 829: order, for each row, it is important that all its ancestor rows
830: and all its open previous siblings are also declared, either in
831: the same call or in an earlier one.</p>
832:
1.80 mike 833: <p>Throws a <code>DATAGRID_MODEL_ERR</code> exception if the
1.1 mike 834: arguments contradict each other or previously declared information
835: (e.g. saying that a row's position is 5 when the parent row only
836: has 3 children, or naming a column that doesn't exist, or
837: declaring a row without declaring its parent, or changing the
838: number of children that a row has while that row and its ancestors
839: are all open).</p>
840:
841: </dd>
842:
843:
1.80 mike 844: <dt><var title="">datagrid</var> . <code title="dom-datagrid-insertRows">insertRows</code>(<var title="">rows</var>)</dt>
1.1 mike 845: <dd>
846:
1.80 mike 847: <p>Inserts the given rows into the <code>datagrid</code>,
848: increasing the numbers of rows that the <code>datagrid</code>
1.1 mike 849: assumes are present.</p>
850:
851: <p>The <var title="">rows</var> argument is an array of rows in
1.80 mike 852: the same structure as the argument to the <code
853: title="dom-datagrid-setRows">setRows()</code> method described
1.1 mike 854: above, with the same expectations of consistency (a given row's
855: ancestors and earlier open siblings being listed either earlier or
1.80 mike 856: in the same call as a given row). However, unlike with the <code
857: title="dom-datagrid-setRows">setRows()</code> method, if a row is
1.1 mike 858: inserted along with its child, the child is not included in the
1.80 mike 859: child and row counts of the parent row; every row in the <var
860: title="">rows</var> argument will increase its parent's counts
1.1 mike 861: automatically.</p>
862:
1.80 mike 863: <p>Throws a <code>DATAGRID_MODEL_ERR</code> exception if the
1.1 mike 864: arguments contradict each other or previously declared
865: information.</p>
866:
867: </dd>
868:
869:
1.80 mike 870: <dt><var title="">datagrid</var> . <code title="dom-datagrid-deleteRows">deleteRows</code>(<var title="">rows</var>)</dt>
1.1 mike 871: <dd>
872:
1.80 mike 873: <p>Removes the given rows from the <code>datagrid</code>, and
1.1 mike 874: updates the number of rows known to be in the
1.80 mike 875: <code>datagrid</code> accordingly. The argument is an array of
876: <code>RowID</code> objects identifying the rows to remove.</p>
1.1 mike 877:
1.80 mike 878: <p>Throws a <code>DATAGRID_MODEL_ERR</code> exception if the argument
879: includes a row the <code>datagrid</code> doesn't know about.</p>
880: <!- - since otherwise behaviour might depend on where the user
881: scrolled! - ->
1.1 mike 882:
883: </dd>
884:
885:
1.80 mike 886: <dt><var title="">datagrid</var> . <code title="dom-datagrid-repaint">repaint</code>(<var title="">row</var>, <var title="">column</var>)</dt>
1.1 mike 887: <dd>
888:
1.80 mike 889: <p>If the given column's type is <code
890: title="datagrid-type-custom">custom</code>, then causes the
891: <code>datagrid</code> to reinvoke the function that obtains the
1.1 mike 892: desired rendering.</p>
893:
894: </dd>
895:
896:
1.80 mike 897: <dt><var title="">datagrid</var> . <code title="dom-datagrid-clearRows">clearRows</code>()</dt>
1.1 mike 898: <dd>
899:
1.80 mike 900: <p>Clears the <code>datagrid</code> of all row data, resetting it
901: to empty<!- - v2DGS:, and clears the selection- ->.</p>
1.1 mike 902:
903: </dd>
904:
1.80 mike 905: </dl>
906:
907:
908: <div class="impl">
1.1 mike 909:
1.80 mike 910: <h6>The listener</h6>
1.1 mike 911:
1.80 mike 912: <p>The <dfn
1.186 mike 913: title="dom-datagrid-listener"><code>listener</code></dfn> IDL
1.1 mike 914: attribute allows authors to specify an object that will receive all
1.80 mike 915: the notifications from the <code>datagrid</code>. Initially, its
1.1 mike 916: value must be null. On getting, it must return its value. On
917: setting, its value must be set to the new value, and then the user
1.80 mike 918: agent must <span>queue a task</span> to call the <code
919: title="dom-listener-initialize">initialize()</code> method with the
920: <code>datagrid</code> element as its only argument.</p>
1.1 mike 921:
922:
1.80 mike 923: <h6>The columns</h6>
1.1 mike 924:
1.80 mike 925: <p>The columns are represented by the <dfn>column list</dfn>, an
1.1 mike 926: ordered list of entries for columns, each of which consists of:</p>
927:
1.80 mike 928: <dl>
929:
930: <dt>An identifier</dt>
1.1 mike 931:
932: <dd>A string used to identify the column in the API.</dd>
933:
934: <dt>A label</dt>
935:
936: <dd>A string used in the user interface.</dd>
937:
938: <dt>A type</dt>
939:
940: <dd>One of the types described below.</dd>
941:
942: <dt>An icon</dt>
943:
1.80 mike 944: <dd>An image, copied from an <code>img</code> element when the
1.1 mike 945: column was declared.</dd>
946:
947: <dt>Whether the column is sortable</dt>
948:
949: <dd>A boolean indicating whether the user can request that the data
950: be sorted by this column (true), or not (false).</dd>
951:
952: <dt>Whether the column is visible</dt>
953:
954: <dd>A boolean indicating whether the column is part of the
1.80 mike 955: <code>datagrid</code>'s rendering.</dd>
1.1 mike 956:
1.80 mike 957: </dl>
958:
959: <p>Initially, the <span>column list</span> must have a single
960: column, the <dfn>default column</dfn>, whose identifier is the empty
961: string, whose label is the empty string, whose type is <code
962: title="datagrid-type-text">text</code>, with no icon, which is not
1.1 mike 963: sortable, and which <em>is</em> visible.</p>
964:
1.80 mike 965: <hr>
966:
967: <p>The <dfn title="dom-datagrid-addColumn"><code>addColumn(<var
968: title="">id</var>, <var title="">label</var>, <var
969: title="">type</var>, <var title="">icon</var>, <var
970: title="">sortable</var>, <var title="">hidden</var>)</code></dfn>
1.1 mike 971: method must run the following steps:</p>
972:
1.80 mike 973: <ol>
974:
975: <li><p>If there is already an entry in <span>column list</span>,
976: other than the <span>default column</span>, whose identifier is
977: <var title="">id</var>, throw a <code>DATAGRID_MODEL_ERR</code>
1.1 mike 978: exception and abort these steps.</p></li>
979:
980: <li>
981:
982: <p>If <var title="">type</var> is not a string equal to one of the
1.80 mike 983: <span>allowed <code>datagrid</code> column types</span>, then
984: throw a <code>DATAGRID_MODEL_ERR</code> exception and abort these
1.1 mike 985: steps.</p>
986:
987: </li>
988:
989: <li><p>If the <var title="">icon</var> argument is present and not
1.80 mike 990: null, but the given <code>img</code> element's <code
991: title="dom-img-complete">complete</code> attribute is false, then
1.1 mike 992: let <var title="">icon</var> be null.</p></li>
993:
994: <li><p>If the <var title="">icon</var> argument is present and not
1.80 mike 995: null, then copy the image data from that <code>img</code> element,
1.1 mike 996: and let <var title="">image</var> be the copy of that image
997: data. Otherwise, let <var title="">image</var> be nothing.</p></li>
998:
1.80 mike 999: <li><p>Append a new entry to the <span>column list</span>, with
1.1 mike 1000: <var title="">id</var> as its identifier, <var title="">label</var>
1.80 mike 1001: as its label, <var title="">type</var> as its type, and <var
1002: title="">image</var> as its icon. Let the column be sortable if the
1.1 mike 1003: <var title="">sortable</var> argument is present and true, and make
1004: it visible unless the <var title="">hidden</var> argument is
1005: present and true.</p></li>
1006:
1.80 mike 1007: <li><p>If the <span>column list</span> contains the <span>default
1008: column</span>, then remove the <span>default column</span> from the
1009: <span>column list</span>, discard any data for cells in that column
1010: in any rows in the <code>datagrid</code>, set <code
1011: title="dom-datagrid-sortColumn">sortColumn</code> to <var
1012: title="">id</var>, set <code
1013: title="dom-datagrid-sortAscending">sortAscending</code> to true,
1014: and run the <span><code>datagrid</code> resort
1015: steps</span>.</p></li>
1016:
1017: </ol>
1018:
1019: <hr>
1.1 mike 1020:
1.80 mike 1021: <p>The <dfn
1.186 mike 1022: title="dom-datagrid-sortColumn"><code>sortColumn</code></dfn> IDL
1.1 mike 1023: attribute gives the current column used for sorting. Initially, its
1024: value must be the empty string. On getting, it must return its
1025: current value. On setting, if the new value doesn't match the
1.80 mike 1026: identifier of one of the columns in the <span>column list</span>,
1027: then the user agent must throw a <code>DATAGRID_MODEL_ERR</code>
1.1 mike 1028: exception. Otherwise, if the new value is not the same as its
1029: current value, then the user agent must set the attribute to the new
1.80 mike 1030: value, and then run the <span><code>datagrid</code> resort
1031: steps</span>.</p>
1.1 mike 1032:
1.80 mike 1033: <p>The <dfn
1034: title="dom-datagrid-sortAscending"><code>sortAscending</code></dfn>
1.186 mike 1035: IDL attribute specifies the direction that the tree is sorted in,
1.1 mike 1036: ascending (true) or descending (false). Initially, its value must be
1037: true (ascending). On getting, it must return its current value. On
1038: setting, if the new value is not the same as its current value, then
1039: the user agent must set the attribute to the new value, and then run
1.80 mike 1040: the <span><code>datagrid</code> resort steps</span>.</p>
1.1 mike 1041:
1042: <p>When a column is marked as being sortable, the user agent should
1043: allow the user to select that column to be the column used for
1044: sorting, and should allow the user to chose whether the sort order
1045: is ascending or descending.</p>
1046:
1047: <p>When the user changes the sort order in this manner, the user
1.80 mike 1048: agent must update the <code
1049: title="dom-datagrid-sortColumn">sortColumn</code> and <code
1050: title="dom-datagrid-sortAscending">sortAscending</code> attributes
1051: appropriately, and then run the <span><code>datagrid</code> resort
1052: steps</span>.</p>
1.1 mike 1053:
1.80 mike 1054: <p class="note">The <span><code>datagrid</code> resort steps</span>
1.1 mike 1055: are described in the next section.</p>
1056:
1.80 mike 1057: <hr>
1.1 mike 1058:
1.80 mike 1059: <p>The <dfn
1060: title="dom-datagrid-clearColumns"><code>clearColumns()</code></dfn>
1061: method, if the <span>column list</span> doesn't contain the
1062: <span>default column</span>, must empty the <span>column
1063: list</span>, append the <span>default column</span> to the now empty
1064: <span>column list</span>, discard any data for cells in all rows in
1065: the <code>datagrid</code>, set <code
1066: title="dom-datagrid-sortColumn">sortColumn</code> to the empty
1067: string, set <code
1068: title="dom-datagrid-sortAscending">sortAscending</code> to true, and
1069: run the <span><code>datagrid</code> resort steps</span>. (If the
1070: <span>column list</span> is already just the <span>default
1071: column</span>, then the method does nothing.)</p>
1.1 mike 1072:
1073:
1.80 mike 1074: <h6>The rows</h6>
1075:
1076: <p>A <code>datagrid</code> element is intended to show a
1.1 mike 1077: representation of a tree, where typically the user only sees a
1078: small part of the tree at a time.</p>
1079:
1.80 mike 1080: <p>To make this efficient, the <code>datagrid</code> element
1.1 mike 1081: <em>actually</em> shows a small part of a <em>sparse</em> tree, so
1082: that only relevant parts of the data structure need be loaded at any
1083: time. Specifically, the model requires only that all the ancestor
1084: rows of the displayed rows be loaded, as well as any open earlier
1085: siblings (in the displayed sort order) of the displayed rows.</p>
1086:
1.80 mike 1087: <p>Conceptually, therefore, a <code>datagrid</code> has a number of
1.1 mike 1088: related sparse data structures backing it.</p>
1089:
1.80 mike 1090: <p>The first is the <dfn>natural order sparse data tree</dfn>. This
1.1 mike 1091: is the structure in which rows are entered as they are declared, in
1092: their natural order. This can differ from the order actually
1093: displayed to the user. It consists of nested sparse lists of
1.80 mike 1094: rows. In the <span>natural order sparse data tree</span>, a row will
1.1 mike 1095: always have all its parents already declared. Once a row is added to
1.80 mike 1096: this structure, it can only be removed by the <code
1097: title="dom-datagrid-deleteRows">deleteRows()</code> and <code
1098: title="dom-datagrid-clearRows">clearRows()</code> methods. The order of
1.1 mike 1099: nodes in this tree never changes; to move a node in this tree, it
1100: has to be removed and then another row (with the same data)
1101: reinserted elsewhere.</p>
1102:
1.80 mike 1103: <p>The second structure is the <dfn>display order sparse data
1.1 mike 1104: tree</dfn>. This is a similar structure that contains a subset of
1.80 mike 1105: the rows in the <span>natural order sparse data tree</span>, ordered
1106: in the order given by the <code
1107: title="dom-datagrid-sortAscending">sortAscending</code> and <code
1108: title="dom-datagrid-sortColumn">sortColumn</code> attributes, and
1.1 mike 1109: excluding rows with one or more ancestors that are closed. This tree
1.80 mike 1110: is cleared whenever the <code
1111: title="dom-datagrid-sortAscending">sortAscending</code> and <code
1112: title="dom-datagrid-sortColumn">sortColumn</code> attributes
1.1 mike 1113: change.</p>
1114:
1.80 mike 1115: <p>The third structure is the <dfn>display order sparse data
1.1 mike 1116: list</dfn>. This structure is a flattened representation of the
1.80 mike 1117: <span>display order sparse data tree</span>.</p>
1.1 mike 1118:
1.80 mike 1119: <p>At any time, a number of consecutive rows in the <span>display
1120: order sparse data list</span> are physically visible to the
1121: user. The <code>datagrid</code> fires notifications to a <span
1122: title="dom-datagrid-listener">listener</span> (provided by script),
1.1 mike 1123: and the listener, or other some script, is expected to feed the
1.80 mike 1124: <code>datagrid</code> with the information needed to render the
1.1 mike 1125: control.</p>
1126:
1.80 mike 1127: <p>A <code>datagrid</code> has a <dfn>pending <code>datagrid</code>
1128: rows list</dfn>, which is a list of rows in the <span>display order
1129: sparse data list</span> for which the <code>datagrid</code> has sent
1.1 mike 1130: notifications requesting information but not yet received
1131: information about.</p>
1132:
1.80 mike 1133: <p>A <code>datagrid</code> also has a <dfn>pending
1.1 mike 1134: <code>datagrid</code> <em>cells</em> list</dfn>, which is a list of
1.80 mike 1135: row/column pairs (cells) for which the <code>datagrid</code> has
1.1 mike 1136: sent notifications requesting information but not yet received
1137: information about.</p>
1138:
1139: <p>User agents may discard information about rows that are not
1140: displayed and that are not ancestors or open earlier siblings of
1141: rows or ancestors of rows that are displayed.</p>
1142:
1.80 mike 1143: <hr>
1144:
1145: <p>These structures are different views of the collection of rows
1146: that form the <code>datagrid</code>. Each row has the following
1.1 mike 1147: information associated with it:</p>
1148:
1.80 mike 1149: <dl>
1150:
1151: <dt>A parent</dt>
1.1 mike 1152:
1.80 mike 1153: <dd><p>Either another row, or the <code>datagrid</code> itself. This
1154: is the parent of the row in the <span>natural order sparse data
1155: tree</span> and the <span>display order sparse data tree</span>
1156: for the <code>datagrid</code>.</p></dd>
1.1 mike 1157:
1158: <dt>A natural order position relative to the other rows with the
1159: same parent</dt>
1160:
1161: <dd>
1162:
1163: <p>This is the number of rows that precede this row under the same
1.80 mike 1164: parent in the <span>natural order sparse data tree</span>. This
1.1 mike 1165: number can't be changed relative to other rows in the same parent;
1166: to change the relative natural order of data in the
1.80 mike 1167: <code>datagrid</code>, the original rows have to be removed and
1.1 mike 1168: new rows (with the same data but different natural positions)
1169: inserted in their place. (The exact number of a row can change, as
1170: new rows can be inserted above it.)</p>
1171:
1.80 mike 1172: <p>A row can be identified by a <code>RowID</code> object. This is
1.1 mike 1173: an array of numbers, consisting of the natural order positions of
1174: each ancestor row and the row itself, starting from the furthest
1175: ancestor. Thus, for instance, the fourth child row of the first
1.80 mike 1176: child row of the second row in a <code>datagrid</code> would be
1177: identified by a <code>RowID</code> object whose value is <code
1178: title="">[1, 0, 3]</code>. A row's identifier changes if rows are
1179: <span title="dom-datagrid-insertRows">inserted before it</span> in
1180: the <code>datagrid</code>.</p>
1.1 mike 1181:
1182: </dd>
1183:
1184: <dt>A display order position relative to the other rows with
1185: the same parent</dt>
1186:
1187: <dd><p>This is the number of rows that precede this row under the
1.80 mike 1188: same parent in the <span>display order sparse data
1189: tree</span>. This number can be unknown. If the sort order
1190: changes, then this information is lost (as the <span>display order
1191: sparse data tree</span> is cleared).</p></dd>
1.1 mike 1192:
1193: <dt>A child count</dt>
1194:
1195: <dd><p>The number of rows that have this row as a parent. If this is
1.80 mike 1196: zero, the row cannot be opened. If this is −1, then the
1.1 mike 1197: child count is unknown but the row can be opened. This value can be
1.80 mike 1198: changed by the <code title="dom-datagrid-setRows">setRows()</code>
1199: method only if the current value is −1 or if the row or one
1.1 mike 1200: of its ancestors is closed. Otherwise, it can only be changed
1.80 mike 1201: indirectly using the <code
1202: title="dom-datagrid-insertRows">insertRows()</code> and <code
1203: title="dom-datagrid-deleteRows">deleteRows()</code> methods.</p></dd>
1.1 mike 1204:
1205: <dt>An open flag</dt>
1206:
1207: <dd><p>A boolean indicating whether the row is open (true) or
1208: closed (false). Once set, the flag can only be changed by the user
1209: or while one of the row's ancestors is itself closed. A row can
1210: also be in a third state, "opening", which is treated as closed for
1211: all purposes except that the user agent may indicate that the row
1212: is in this special state, and except that when the row is updated
1213: to have a row count, the row will switch to being open.</p></dd>
1214:
1215: <dt>A row count</dt>
1216:
1217: <dd><p>The number of rows that have this row as a parent or
1218: ancestor, and that do not have an ancestor that is a descendant of
1.80 mike 1219: this row that is itself closed. If this is −1, then the row
1220: count is unknown. This value can be changed by the <code
1221: title="dom-datagrid-setRows">setRows()</code> method only if the
1.1 mike 1222: row or one of its ancestors is closed (or opening, but not
1.80 mike 1223: open). Otherwise, it can only be changed indirectly using the <code
1224: title="dom-datagrid-insertRows">insertRows()</code> and <code
1225: title="dom-datagrid-deleteRows">deleteRows()</code>
1.1 mike 1226: methods.</p></dd>
1227:
1228: <dt>Cells</dt>
1229:
1230: <dd><p>The data that applies to this row. Cell data is discussed in
1231: more detail below.</p></dd>
1232:
1.80 mike 1233: </dl>
1234:
1235: <p>The <code>datagrid</code> itself also has a <dfn title="datagrid
1236: child count">child count</dfn> and a <dfn title="datagrid row
1.1 mike 1237: count">row count</dfn>, which are analogous to the child counts and
1238: row counts for rows. Initially, these must be zero.</p>
1239:
1.80 mike 1240: <hr>
1241:
1242: <p>The <dfn><code>datagrid</code> resort steps</dfn>, which are
1.1 mike 1243: invoked when the sort order changes as described in the previous
1244: section, are as follows:</p>
1245:
1.80 mike 1246: <ol>
1.1 mike 1247:
1.80 mike 1248: <li>
1249:
1250: <p>Clear the <span>display order sparse data tree</span>
1.1 mike 1251: (i.e. mark the display order position of all the rows in the
1.80 mike 1252: <code>datagrid</code> as unknown).</p>
1.1 mike 1253:
1254: <p>User agents may cache the position information of rows for
1.80 mike 1255: various values of <code
1256: title="dom-datagrid-sortColumn">sortColumn</code> and <code
1257: title="dom-datagrid-sortAscending">sortAscending</code>, instead
1.1 mike 1258: of discarding the information altogether. If the user agent caches
1259: this information, and has information that applies to the current
1.80 mike 1260: values of <code title="dom-datagrid-sortColumn">sortColumn</code>
1261: and <code title="dom-datagrid-sortAscending">sortAscending</code>,
1262: then the user agent may repopulate the <span>display order sparse
1263: data tree</span> from this information.</p>
1.1 mike 1264:
1265: </li>
1266:
1267: <li>
1268:
1.80 mike 1269: <p>Clear the <span>pending <code>datagrid</code> rows list</span>
1270: and the <span>pending <code>datagrid</code> cells list</span>.</p>
1.1 mike 1271:
1272: </li>
1273:
1274: <li>
1275:
1.80 mike 1276: <p>Invoke the <span><code>datagrid</code> update display
1277: algorithm</span>.</p>
1.1 mike 1278:
1279: </li>
1280:
1.80 mike 1281: <!- - v2: queue a task to fire an event, or tell the listener the
1282: sort order changed, or something - ->
1283:
1284: </ol>
1.1 mike 1285:
1.80 mike 1286: <hr>
1.1 mike 1287:
1.80 mike 1288: <p>The <dfn
1289: title="dom-datagrid-renotify"><code>renotify()</code></dfn> method
1290: must empty the <span>pending <code>datagrid</code> rows list</span>
1291: and the <span>pending <code>datagrid</code> cells list</span>, and
1292: invoke the <span><code>datagrid</code> update display
1293: algorithm</span>.</p>
1294:
1295: <hr>
1296:
1297: <p>The <dfn title="dom-datagrid-setRowCount"><code>setRowCount(<var
1298: title="">childCount</var>, <var
1299: title="">rowCount</var>)</code></dfn> method must run the following
1.1 mike 1300: steps:</p>
1301:
1.80 mike 1302: <ol>
1.1 mike 1303:
1.80 mike 1304: <li>
1305:
1306: <p>Set the <span><code>datagrid</code> child count</span> to <var
1307: title="">childCount</var>, the <span><code>datagrid</code> row
1308: count</span> to <var title="">rowCount</var>.</p>
1.1 mike 1309:
1310: </li>
1311:
1312: <li>
1313:
1.80 mike 1314: <p><span>Audit the <code>datagrid</code></span>. If this fails,
1.1 mike 1315: then revert the changes made in the previous step, throw a
1.80 mike 1316: <code>DATAGRID_MODEL_ERR</code> exception, and abort these
1.1 mike 1317: steps.</p>
1318:
1319: </li>
1320:
1321: <li>
1322:
1.80 mike 1323: <p>Invoke the <span><code>datagrid</code> update display
1324: algorithm</span>.</p>
1.1 mike 1325:
1326: </li>
1327:
1.80 mike 1328: </ol>
1329:
1330: <hr>
1331:
1332: <p>The <dfn title="dom-datagrid-setRows"><code>setRows(<var
1333: title="">rows</var>)</code></dfn> method must run the following
1.1 mike 1334: steps:</p>
1335:
1.80 mike 1336: <ol>
1.1 mike 1337:
1.80 mike 1338: <li>
1339:
1340: <p><span title="type-check a RowList object">Type-check the <var
1341: title="">rows</var> argument</span>. If this fails, throw a
1.1 mike 1342: <code>TypeError</code> exception, and abort these steps.</p>
1343:
1344: </li>
1345:
1346: <li>
1347:
1.80 mike 1348: <p><span title="partially sort a RowList object">Partially sort
1349: the <var title="">rows</var> argument</span>.</p>
1.1 mike 1350:
1351: </li>
1352:
1353: <li>
1354:
1.80 mike 1355: <p>For each <code>Row</code> object in the <var
1356: title="">rows</var> argument, in order, perform the appropriate
1.1 mike 1357: steps from the list below.</p>
1358:
1.80 mike 1359: <p class="note">The changes made to the <code>datagrid</code>'s
1.1 mike 1360: data structures in this step get reverted (as required below) if
1361: any consistency errors are detected either in this step or the
1362: next.</p>
1363:
1.80 mike 1364: <dl>
1365:
1366: <dt>If there already exists a row in the <code>datagrid</code>'s
1367: <span>natural order sparse data tree</span> with the same
1368: identifier as given by the <code>Row</code> object's
1369: <code>RowID</code> object, and that row and all its ancestors are
1.1 mike 1370: open</dt>
1371:
1372: <dd>
1373:
1374: <p>If one of the following conditions is true, then revert all
1375: the changes done in this step, throw a
1.80 mike 1376: <code>DATAGRID_MODEL_ERR</code> exception, and abort these
1.1 mike 1377: steps:</p>
1378:
1.80 mike 1379: <ul>
1380:
1381: <li>The value of the <code>Row</code> object's second entry is
1382: neither −1 nor equal to the child count of the
1.1 mike 1383: preexisting row.</li>
1384:
1.80 mike 1385: <li>The <code>Row</code> object has fewer than four
1.1 mike 1386: entries or more than six entries.</li>
1387:
1.80 mike 1388: <li>The <code>Row</code> object has five or more entries, and
1.1 mike 1389: its fifth entry is false.</li>
1390:
1.80 mike 1391: <li>The <code>Row</code> object has six entries, and its sixth
1.1 mike 1392: entry is not equal to the row count of the preexisting
1393: row.</li>
1394:
1.80 mike 1395: </ul>
1396:
1397: </dd>
1.1 mike 1398:
1.80 mike 1399: <dt>If there already exists a row in the <code>datagrid</code>'s
1400: <span>natural order sparse data tree</span> with the same
1401: identifier as given by the <code>Row</code> object's
1402: <code>RowID</code> object, but either that row or one of its
1.1 mike 1403: ancestors is closed</dt>
1404:
1405: <dd>
1406:
1407: <p>Set the preexisting row's child count to the value of the
1.80 mike 1408: <code>Row</code> object's second entry.</p>
1.1 mike 1409:
1.80 mike 1410: <p>If the <code>Row</code> object has five or more entries, and
1.1 mike 1411: either its fifth entry is true and the preexisting row is closed
1412: but not opening, or its fifth entry is false and the preexisting
1413: row is open, then: if the preexisting row has no ancestor row
1414: that is closed, then revert all the changes done in this step,
1.80 mike 1415: throw a <code>DATAGRID_MODEL_ERR</code> exception, and abort
1.1 mike 1416: these steps; otherwise, if the fifth entry is false, then close
1417: the row; otherwise, open the row.</p>
1418:
1.80 mike 1419: <p>If the <code>Row</code> object has six entries, set the
1420: preexisting row's row count to the value of the <code>Row</code>
1.1 mike 1421: object's sixth entry.</p>
1422:
1423: <p>If the preexisting row is opening, then: increase the
1.80 mike 1424: <span><code>datagrid</code> row count</span> and the row counts
1.1 mike 1425: of any ancestor rows by the number of rows that the preexisting
1.80 mike 1426: row now has in its row count, then open the row.</p> <!- - we
1.1 mike 1427: should also "update the <span>pending <code>datagrid</code> rows
1428: list</span> and the <span>pending <code>datagrid</code> cells
1.80 mike 1429: list</span> accordingly" - ->
1.1 mike 1430:
1431:
1432: </dd>
1433:
1.80 mike 1434: <dt>There does not exist a row in the <code>datagrid</code>'s
1435: <span>natural order sparse data tree</span> with the same
1436: identifier as given by the <code>Row</code> object's
1437: <code>RowID</code> object</dt>
1.1 mike 1438:
1439: <dd>
1440:
1.80 mike 1441: <p>If the <code>RowID</code> object has a length greater than 1,
1.1 mike 1442: then verify that there is a row identified by the
1.80 mike 1443: <code>RowID</code> consisting of all but the last number in the
1444: <code>Row</code> object's <code>RowID</code>. If there is no
1445: such row present in the <span>natural order sparse data
1446: tree</span>, then revert all the changes done in this step,
1447: throw a <code>DATAGRID_MODEL_ERR</code> exception, and abort
1.1 mike 1448: these steps.</p>
1449:
1.80 mike 1450: <p>Create a row and insert it into the <span>natural order
1451: sparse data tree</span>, such that its parent is the row
1452: identified by the <code>RowID</code> consisting of all but the
1453: last number in the <code>Row</code> object's <code>RowID</code>,
1454: or the <code>datagrid</code> if the length of the
1455: <code>Row</code> object's <code>RowID</code> is 1; with its
1.1 mike 1456: natural order position being the last number of the
1.80 mike 1457: <code>Row</code> object's <code>RowID</code>; with the child
1458: count being the value of the third entry of the <code>Row</code>
1.1 mike 1459: object; with the row being marked closed unless the
1.80 mike 1460: <code>Row</code> object has five or more entries and its fifth
1.1 mike 1461: entry is true, in which case the row is open; and with its row
1.80 mike 1462: count being −1 unless the <code>Row</code> object has six
1.1 mike 1463: entries, in which case the row count is equal to the value of
1.80 mike 1464: the <code>Row</code> object's sixth entry.</p>
1.1 mike 1465:
1466: </dd>
1467:
1.80 mike 1468: </dl>
1469:
1470: </li>
1.1 mike 1471:
1472: <li>
1473:
1.80 mike 1474: <p><span>Audit the <code>datagrid</code></span>. If this fails,
1.1 mike 1475: then revert the changes made in the previous step, throw a
1.80 mike 1476: <code>DATAGRID_MODEL_ERR</code> exception, and abort these
1.1 mike 1477: steps.</p>
1478:
1479: </li>
1480:
1481: <li>
1482:
1.80 mike 1483: <p>For each <code>Row</code> object in the <var
1484: title="">rows</var> argument, in order, <span title="apply a Row
1485: object">apply the <code>Row</code> object</span>.</p>
1.1 mike 1486:
1487: </li>
1488:
1489: <li>
1490:
1.80 mike 1491: <p>Invoke the <span><code>datagrid</code> update display
1492: algorithm</span>.</p>
1.1 mike 1493:
1494: </li>
1495:
1.80 mike 1496: </ol>
1497:
1498: <hr>
1499:
1500: <p>The <dfn title="dom-datagrid-insertRows"><code>insertRows(<var
1501: title="">rows</var>)</code></dfn> method must run the following
1.1 mike 1502: steps:</p>
1503:
1.80 mike 1504: <ol>
1505:
1506: <li>
1.1 mike 1507:
1.80 mike 1508: <p><span title="type-check a RowList object">Type-check the <var
1509: title="">rows</var> argument</span>. If this fails, throw a
1.1 mike 1510: <code>TypeError</code> exception, and abort these steps.</p>
1511:
1512: </li>
1513:
1514: <li>
1515:
1.80 mike 1516: <p><span title="partially sort a RowList object">Partially sort
1517: the <var title="">rows</var> argument</span>.</p>
1.1 mike 1518:
1519: </li>
1520:
1521: <li>
1522:
1.80 mike 1523: <p>For each <code>Row</code> object in the <var
1524: title="">rows</var> argument, in order, run the following
1.1 mike 1525: steps:</p>
1526:
1.80 mike 1527: <p class="note">The changes made to the <code>datagrid</code>'s
1.1 mike 1528: data structures in this step get reverted (as required below) if
1529: any consistency errors are detected either in this step or the
1530: next.</p>
1531:
1.80 mike 1532: <ol>
1533:
1534: <li>
1.1 mike 1535:
1536: <p>Let <var title="">parent</var> be the row identified by the
1.80 mike 1537: <code>RowID</code> consisting of all but the last number in the
1538: <code>Row</code> object's <code>RowID</code>, or the
1539: <code>datagrid</code> itself if the <code>Row</code> object's
1540: <code>RowID</code> has length 0.</p>
1541:
1542: <p>If there is no such row present in the <span>natural order
1543: sparse data tree</span>, then revert all the changes done in
1544: this algorithm, throw a <code>DATAGRID_MODEL_ERR</code>
1.1 mike 1545: exception, and abort these steps.</p>
1546:
1547: </li>
1548:
1549: <li>
1550:
1551: <p>Increment by one the natural order position of all rows whose
1552: parent is <var title="">parent</var> and whose natural order
1553: position is equal to or greater than the last number of the
1.80 mike 1554: <code>Row</code> object's <code>RowID</code>.</p>
1.1 mike 1555:
1556: </li>
1557:
1558: <li>
1559:
1.80 mike 1560: <p>If the value of the <code>Row</code> object's second entry is
1561: not −1, then increment by one the display order position
1.1 mike 1562: of all rows whose parent is <var title="">parent</var> and whose
1563: display order position is equal to or greater than the value of
1.80 mike 1564: the <code>Row</code> object's second entry.</p>
1.1 mike 1565:
1.80 mike 1566: <!- -(Not sure how to really say this.)
1.1 mike 1567: <p>Update the <span>pending <code>datagrid</code> rows
1568: list</span> and the <span>pending <code>datagrid</code> cells
1569: list</span> accordingly.</p>
1.80 mike 1570: - ->
1.1 mike 1571:
1572: </li>
1573:
1574: <li>
1575:
1.80 mike 1576: <p>Create a row and insert it into the <span>natural order
1577: sparse data tree</span>, such that its parent is <var
1578: title="">parent</var>; with its natural order position being the
1579: last number of the <code>Row</code> object's <code>RowID</code>;
1.1 mike 1580: with the child count being the value of the third entry of the
1.80 mike 1581: <code>Row</code> object; with the row being marked closed unless
1582: the <code>Row</code> object has five or more entries and its
1.1 mike 1583: fifth entry is true, in which case the row is open; and with its
1.80 mike 1584: row count being −1 unless the <code>Row</code> object has
1.1 mike 1585: six entries, in which case the row count is equal to the value
1.80 mike 1586: of the <code>Row</code> object's sixth entry.</p>
1.1 mike 1587:
1588: </li>
1589:
1.80 mike 1590: </ol>
1591:
1592: </li>
1.1 mike 1593:
1594: <li>
1595:
1.80 mike 1596: <p>For each <code>Row</code> object in the <var
1597: title="">rows</var> argument, in order, <span title="apply a Row
1598: object">apply the <code>Row</code> object</span>.</p>
1.1 mike 1599:
1600: </li>
1601:
1602: <li>
1603:
1.80 mike 1604: <p>Invoke the <span><code>datagrid</code> update display
1605: algorithm</span>.</p>
1.1 mike 1606:
1607: </li>
1608:
1.80 mike 1609: </ol>
1610:
1611: <hr>
1612:
1613: <p>When an algorithm requires the user agent to <dfn>type-check a
1.1 mike 1614: <code>RowList</code> object</dfn> (an array), each entry in the
1615: object must be checked against the following requirements. If any
1616: are false, then the type-check fails, otherwise it passes.</p>
1617:
1.80 mike 1618: <ul>
1619:
1620: <li><p>The entry is a <code>Row</code> object (an
1.1 mike 1621: array).</p></li>
1622:
1.80 mike 1623: <li><p>The first value in the <code>Row</code> is a
1624: <code>RowID</code> object (also an array), whose length is at least
1.1 mike 1625: 1, and whose values are all integers greater than or equal to
1626: zero.</p></li>
1627:
1.80 mike 1628: <li><p>The numbers in the <code>RowID</code> object do not exactly
1629: match any of the other entries in the <code>RowList</code> object
1630: (i.e. no two <code>Row</code> objects have the same
1.1 mike 1631: identifier).</p></li>
1632:
1.80 mike 1633: <li><p>The second value in the <code>Row</code> is an integer that
1634: is either −1, zero, or a positive integer.</p></li>
1.1 mike 1635:
1.80 mike 1636: <li><p>The third value in the <code>Row</code> is an integer that
1637: is either −1, zero, or a positive integer.</p></li>
1.1 mike 1638:
1.80 mike 1639: <li><p>The fourth value in the <code>Row</code> is a
1640: <code>CellList</code> object (yet another array).</p></li>
1.1 mike 1641:
1.80 mike 1642: <li><p>Each entry in the <span>CellList</span> object is a
1643: <code>Cell</code> object (again, an array).</p></li>
1.1 mike 1644:
1.80 mike 1645: <li><p>Each <code>Cell</code> object in the <span>CellList</span>
1646: object has as its first value a <code>Column</code> object (a
1.1 mike 1647: string), and its value is the identifier of one of the columns in
1.80 mike 1648: the <span>column list</span>.</p></li>
1.1 mike 1649:
1650: <li>
1651:
1.80 mike 1652: <p>Each <code>Cell</code> object in the <span>CellList</span>
1.1 mike 1653: object has as its second and subsequent entries values that match
1654: the following requirements, as determined by the type of the
1655: column identified by the first entry:</p>
1656:
1.80 mike 1657: <dl>
1658:
1659: <dt>If the column's type is <code title="datagrid-type-text">text</code></dt>
1.1 mike 1660: <dd>
1661:
1662: <p>The second entry's value is a string, and either there are
1663: only two entries, or there are three, and the third entry is
1.80 mike 1664: an <code>img</code> element.</p>
1.1 mike 1665:
1.80 mike 1666: <p>If there is an <code>img</code> element specified, its <code
1667: title="dom-img-complete">complete</code> attribute is true.</p>
1.1 mike 1668:
1669: </dd>
1670:
1.80 mike 1671: <dt>If the column's type is <code title="datagrid-type-editable">editable</code></dt>
1.1 mike 1672: <dd>
1673:
1674: <p>The second entry's value is a string, and either there are
1675: only two entries, or the third entry is a
1.80 mike 1676: <code>datalist</code> element, and either there are only three
1.1 mike 1677: entries, or there are four, and the fourth entry is an
1.80 mike 1678: <code>img</code> element.</p>
1.1 mike 1679:
1.80 mike 1680: <p>If there is an <code>img</code> element specified, its <code
1681: title="dom-img-complete">complete</code> attribute is true.</p>
1.1 mike 1682:
1683: </dd>
1684:
1.80 mike 1685: <dt>If the column's type is <code title="datagrid-type-checkable">checkable</code></dt>
1.1 mike 1686: <dd>
1687:
1688: <p>The second entry's value is a string, the third entry is a
1689: boolean, and either there are only three entries, or the
1690: fourth entry is also a boolean, and either there are only four
1691: entries, or there are five, and the fifth entry is an
1.80 mike 1692: <code>img</code> element.</p>
1.1 mike 1693:
1.80 mike 1694: <p>If there is an <code>img</code> element specified, its <code
1695: title="dom-img-complete">complete</code> attribute is true.</p>
1.1 mike 1696:
1697: </dd>
1698:
1.80 mike 1699: <dt>If the column's type is <code title="datagrid-type-list">list</code></dt>
1.1 mike 1700: <dd>
1701:
1702: <p>The second entry's value is a string, the third entry is a
1.80 mike 1703: <code>select</code> element, and either there are only three
1.1 mike 1704: entries, or there are four, and the fourth entry is an
1.80 mike 1705: <code>img</code> element.</p>
1.1 mike 1706:
1.80 mike 1707: <p>If there is an <code>img</code> element specified, its <code
1708: title="dom-img-complete">complete</code> attribute is true.</p>
1.1 mike 1709:
1710: </dd>
1711:
1.80 mike 1712: <dt>If the column's type is <code title="datagrid-type-progress">progress</code></dt>
1.1 mike 1713: <dd>
1714:
1715: <p>There are only two entries, the second entry's value is a
1716: number, and the number's value is between 0.0 and 1.0
1717: inclusive.</p>
1718:
1719: </dd>
1720:
1.80 mike 1721: <dt>If the column's type is <code title="datagrid-type-meter">meter</code></dt>
1.1 mike 1722: <dd>
1723:
1724: <p>There are at least two, but possibly up to seven, entries,
1725: all entries but the first one are numbers, and the following
1726: relationships hold:</p>
1727:
1.80 mike 1728: <ul class="brief">
1729:
1730: <li>The second entry is less than the third, or less than 1.0
1.1 mike 1731: if the third is absent.</li>
1732:
1733: <li>The second entry is greater than the fourth, or greater
1734: than 0.0 if the fourth is absent.</li>
1735:
1736: <li>If there are at least three entries, the third entry is
1737: greater than the fourth, or greater than zero if the fourth
1738: is absent.</li>
1739:
1740: <li>If there are at least five entries, the fifth is not
1741: greater than the third and not less than the fourth.</li>
1742:
1743: <li>If there are at least six entries, the sixth is not
1744: greater than the third and not less than the fifth.</li>
1745:
1746: <li>If there are at least seven entries, the fifth is not
1747: greater than the third and not less than the fourth.</li>
1748:
1.80 mike 1749: </ul>
1.1 mike 1750:
1.80 mike 1751: </dd>
1752:
1753: <dt>If the column's type is <code title="datagrid-type-custom">custom</code></dt>
1.1 mike 1754: <dd>
1755:
1756: <p>There are four entries, the second and third are numbers
1757: that are integers greater than zero, and the fourth is a
1758: <code>Rendering2DContextCallback</code> object (a
1759: function).</p>
1760:
1761: </dd>
1762:
1.80 mike 1763: </dl>
1764:
1765: </li>
1.1 mike 1766:
1.80 mike 1767: <li><p>Either there are only four values in the <code>Row</code>,
1768: or the fifth value in the <code>Row</code> is a boolean.</p></li>
1.1 mike 1769:
1770: <li><p>Either there are only four or five values in the
1.80 mike 1771: <code>Row</code>, or there are six, and the sixth value in the
1772: <code>Row</code> an integer that is greater than or equal to
1.1 mike 1773: zero.</p></li>
1774:
1.80 mike 1775: </ul>
1776:
1777: <p>Where the above requirements say that a value is to be a string,
1.718 mike 1778: the user agent must apply the ToString() abstract operation to the
1.1 mike 1779: value, assume that the value was indeed a string, and use the result
1780: in the rest of the algorithm as if it had that had been the value
1.98 mike 1781: passed to the method. <a href="#refsECMA262">[ECMA262]</a></p>
1.1 mike 1782:
1783: <p>Where the above requirements say that a value is to be a number,
1.718 mike 1784: the user agent must first apply the ToNumber() abstract operation
1.60 mike 1785: to the value, and then verify that the result is neither an Infinity
1786: value nor a Not-a-Number (NaN) value. If this result is indeed
1787: acceptable (i.e. finite), the user agent must use the result in the
1788: rest of the algorithm as if it had that had been the value passed to
1.98 mike 1789: the method. <a href="#refsECMA262">[ECMA262]</a></p>
1.1 mike 1790:
1791: <p>Where the above requirements say that a value is to be an
1.718 mike 1792: integer, the user agent must first apply the ToNumber() abstract
1793: operation to the value, and then verify that the result is a finite
1.1 mike 1794: integer. If so, the user agent must use the result in the rest of
1795: the algorithm as if it had that had been the value passed to the
1.98 mike 1796: method. <a href="#refsECMA262">[ECMA262]</a></p>
1.1 mike 1797:
1798: <p>Where the above requirements say that a value is to be a boolean,
1.718 mike 1799: the user agent must apply the ToBoolean() abstract operation to the
1.1 mike 1800: value, assume that the value was indeed a boolean, and use the
1801: result in the rest of the algorithm as if it had that had been the
1.98 mike 1802: value passed to the method. <a href="#refsECMA262">[ECMA262]</a></p>
1.80 mike 1803:
1804: <hr>
1.1 mike 1805:
1.80 mike 1806: <p>When an algorithm requires the user agent to <dfn>audit the
1807: <code>datagrid</code></dfn>, the <code>datagrid</code> must be
1.1 mike 1808: checked against the following requirements. If any are false, then
1809: the audit fails, otherwise it passes.</p>
1810:
1.80 mike 1811: <ul>
1812:
1813: <li>There is no row whose natural order position is greater than or
1814: equal to the child count of its parent row in the <span>natural
1815: order sparse data tree</span>.</li>
1.1 mike 1816:
1817: <li>There is no row whose display order position is greater than or
1.80 mike 1818: equal to the child count of its parent row in the <span>display
1819: order sparse data tree</span>.</li>
1.1 mike 1820:
1821: <li>There is no row such that the sum of that row's child count and
1822: the row counts all the open rows that are direct children of that
1.80 mike 1823: row in the <span>natural order sparse data tree</span> is less than
1.1 mike 1824: that row's row count.</li>
1825:
1826: <li>Of the rows whose child count is equal to the number of rows
1.80 mike 1827: that are direct children of that row in the <span>natural order
1828: sparse data tree</span>, there is none such that the sum of that
1.1 mike 1829: row's child count and the row counts of all the open rows that are
1.80 mike 1830: direct children of that row in the <span>natural order sparse data
1831: tree</span> is greater than that row's row count.</li>
1832:
1833: </ul>
1.1 mike 1834:
1.80 mike 1835: <p>For the purposes of this audit, the <code>datagrid</code> must be
1.1 mike 1836: treated as the parent row of all the rows that are direct children
1.80 mike 1837: of the <code>datagrid</code> in the <span>natural order sparse data
1838: tree</span> and the <span>display order sparse data tree</span>. The
1839: child count of this implied row is the <span><code>datagrid</code>
1840: child count</span>, and the row count of this implied row is the
1841: <span><code>datagrid</code> row count</span>.</p>
1842:
1843: <hr>
1.1 mike 1844:
1.80 mike 1845: <p>When an algorithm requires the user agent to <dfn>partially sort
1.1 mike 1846: a <code>RowList</code> object</dfn> (an array), the entries in the
1.80 mike 1847: object must be resorted such that <code>Row</code> objects are
1.1 mike 1848: listed after any of their ancestors and after any of their earlier
1.80 mike 1849: siblings. In other words, for any two <code>Row</code> objects <var
1850: title="">a</var> and <var title="">b</var> in the
1851: <code>RowList</code>, where <var title="">a</var> is before <var
1852: title="">b</var> after the sort, the following conditions must
1.1 mike 1853: hold:</p>
1854:
1.80 mike 1855: <ul>
1856:
1857: <li><p>If their <code>RowID</code> objects are the same length and
1.1 mike 1858: have values that are equal except for the last value, then the last
1.80 mike 1859: value of <var title="">a</var>'s <code>RowID</code>'s last value
1860: must be less than <var title="">b</var>'s <code>RowID</code>'s last
1.1 mike 1861: value (i.e. earlier siblings must come before their later
1862: siblings).</p></li>
1863:
1.80 mike 1864: <li><p>If their <code>RowID</code> objects are not the same length,
1.1 mike 1865: but the values in the shorter of the two are the same as the first
1866: few values in the longer one, then <var title="">a</var>'s
1.80 mike 1867: <code>RowID</code> must be the shorter one (i.e. ancestors must
1.1 mike 1868: come before their descendants).</p></li>
1869:
1.80 mike 1870: </ul>
1871:
1872: <hr>
1873:
1874: <p>The <dfn title="dom-datagrid-deleteRows"><code>deleteRows(<var
1875: title="">rows</var>)</code></dfn> method must run the following
1.1 mike 1876: steps:</p>
1877:
1.80 mike 1878: <ol>
1879:
1880: <li>
1.1 mike 1881:
1882: <p>If any of the entries in <var title="">rows</var> are not
1.80 mike 1883: <code>RowID</code> objects consisting of one or more entries whose
1.1 mike 1884: values are all integers that are greater than or equal to zero,
1885: then throw a <code>TypeError</code> exception and abort these
1886: steps.</p>
1887:
1888: <p>To check if a value is an integer, the user agent must first
1.718 mike 1889: apply the ToNumber() abstract operation to the value, and then
1.1 mike 1890: verify that the result is a finite integer. If so, the user agent
1891: must use the result in the rest of the algorithm as if it had that
1.80 mike 1892: had been the value passed to the method. <a
1.98 mike 1893: href="#refsECMA262">[ECMA262]</a></p>
1.1 mike 1894:
1895: </li>
1896:
1897: <li>
1898:
1.80 mike 1899: <p>If any of the <code>RowID</code> objects in the <var
1900: title="">rows</var> argument identify a row that isn't present in
1901: the <span>natural order sparse data tree</span>, then throw a
1902: <code>DATAGRID_MODEL_ERR</code> exception and abort these
1.1 mike 1903: steps.</p>
1904:
1905: </li>
1906:
1907: <li>
1908:
1909: <p>If any row is listed twice in the <var title="">rows</var>
1.80 mike 1910: argument, then throw a <code>DATAGRID_MODEL_ERR</code> exception
1.1 mike 1911: and abort these steps.</p>
1912:
1913: </li>
1914:
1915: <li>
1916:
1917: <p>Sort the <var title="">rows</var> argument such that the
1918: entries are given in the same order as the rows they identify
1919: would be visited in a pre-order, depth first traversal of the
1.80 mike 1920: <span>natural order sparse data tree</span>.</p>
1.1 mike 1921:
1922: </li>
1923:
1924: <li>
1925:
1926: <p>For each row identified by entries in <var title="">rows</var>,
1927: <em>in reverse order</em>, run the following steps:</p>
1928:
1.80 mike 1929: <ol>
1930:
1931: <li>
1.1 mike 1932:
1933: <p>Decrement the child count of the row's parent row, if that
1934: child count is greater than zero. If the row has no parent,
1.80 mike 1935: decrement the <span><code>datagrid</code> child
1936: count</span>.</p>
1.1 mike 1937:
1938: <p>If the row has a parent row, and its child count is now zero,
1939: then close that row.</p>
1940:
1941: </li>
1942:
1943: <li>
1944:
1945: <p>Let <var title="">delta</var> be one more than the row's row
1946: count if the row is open and its row count is greater than zero;
1947: otherwise, let <var title="">delta</var> be one.</p>
1948:
1949: </li>
1950:
1951: <li>
1952:
1953: <p>Let <var title="">ancestor</var> be the row.</p>
1954:
1955: </li>
1956:
1957: <li>
1958:
1959: <p><i>Row count loop</i>: Let <var title="">ancestor</var> be
1960: <var title="">ancestor</var>'s parent row, if any, or null if it
1961: has none.</p>
1962:
1963: </li>
1964:
1965: <li>
1966:
1967: <p>If <var title="">ancestor</var> is null, then decrement the
1.80 mike 1968: <span><code>datagrid</code> row count</span> by <var
1969: title="">delta</var>. Otherwise, if <var title="">ancestor</var>
1970: is open, then decrement its row count by <var
1971: title="">delta</var>.</p>
1.1 mike 1972:
1973: </li>
1974:
1975: <li>
1976:
1977: <p>If <var title="">ancestor</var> is not null, then jump back
1978: to the step labeled <i>row count loop</i> above.</p>
1979:
1980: </li>
1981:
1982: <li>
1983:
1984: <p>Let <var title="">parent</var> be the row's parent, or the
1.80 mike 1985: <code>datagrid</code> if the row has no parent.</p>
1.1 mike 1986:
1987: </li>
1988:
1989: <li>
1990:
1991: <p>Decrement by one the natural order position of all rows whose
1992: parent is <var title="">parent</var> and whose natural order
1993: position is equal to or greater than the row's own natural order
1994: position.</p>
1995:
1996: </li>
1997:
1998: <li>
1999:
1.80 mike 2000: <p>If the row is in the <span>display order sparse data
2001: tree</span>, then decrement by one the display order position of
1.1 mike 2002: all rows whose parent is <var title="">parent</var> and whose
2003: display order position is equal to or greater than the row's own
2004: display order position.</p>
2005:
2006: </li>
2007:
2008: <li>
2009:
2010: <p>Clear the row and its descendants from the
1.80 mike 2011: <code>Datagrid</code>.</p>
1.1 mike 2012:
2013: </li>
2014:
1.80 mike 2015: </ol>
2016:
2017: </li>
1.1 mike 2018:
2019: <li>
2020:
1.80 mike 2021: <p>Invoke the <span><code>datagrid</code> update display
2022: algorithm</span>.</p>
1.1 mike 2023:
2024: </li>
2025:
1.80 mike 2026: </ol>
1.1 mike 2027:
1.80 mike 2028: <hr>
2029:
2030: <p>The <dfn
2031: title="dom-datagrid-clearRows"><code>clearRows()</code></dfn> method
2032: must empty the <span>natural order sparse data tree</span>, reset
2033: both the <span><code>datagrid</code> child count</span> and the
2034: <span><code>datagrid</code> row count</span> to zero, and invoke the
2035: <span><code>datagrid</code> update display algorithm</span>.</p>
2036:
2037: <hr>
2038:
2039: <p>The <dfn title="dom-datagrid-repaint"><code>repaint(<var
2040: title="">row</var>, <var title="">column</var>)</code></dfn> method
1.1 mike 2041: must cause the user agent to clear its cache for the cell specified
1.80 mike 2042: by the identifier <var title="">row</var> and the column <var
2043: title="">column</var>, if that column's type is <code
2044: title="datagrid-type-custom">custom</code>. If the given column has
2045: not been declared, or its type is not <code
2046: title="datagrid-type-custom">custom</code>, then the user agent must
2047: throw a <code>DATAGRID_MODEL_ERR</code> exception. If the given row
1.1 mike 2048: is not known, then the method must do nothing. If the cell is indeed
2049: cleared, the user agent must reinvoke the previously registered
1.80 mike 2050: <code>RenderingContext2DCallback</code> callback when it needs to
1.1 mike 2051: repaint that row.</p>
2052:
1.80 mike 2053: <hr>
2054:
2055: <p>If a row has a child count that isn't zero, then the user agent
1.1 mike 2056: should offer to the user the option of opening and closing the
2057: row.</p>
2058:
2059: <p>When a row is opened, if the row's row count is greater than
2060: zero, then the user agent must increase the
1.80 mike 2061: <span><code>datagrid</code> row count</span> and the row counts of
1.1 mike 2062: any ancestor rows by the number of rows that the newly opened row
1.80 mike 2063: has in its row count<!- - we should also "update the <span>pending
1.1 mike 2064: <code>datagrid</code> rows list</span> and the <span>pending
1.80 mike 2065: <code>datagrid</code> cells list</span> accordingly" - ->, then must
2066: mark the row as open, then may fill in the <span>display order
2067: sparse data tree</span> with any information that the user agent has
1.1 mike 2068: cached about the display order positions of descendants of the newly
1.80 mike 2069: opened row, and then must invoke the <code
2070: title="dom-listener-rowOpened">rowOpened()</code> method on the
2071: current <code title="dom-datagrid-listener">listener</code> with as
2072: its first argument a <code>RowID</code> object identifying the row
1.1 mike 2073: that was opened and as its second argument the boolean false, and
1.80 mike 2074: then must invoke the <span><code>datagrid</code> update display
2075: algorithm</span>.</p>
1.1 mike 2076:
2077: <p>On the other hand, when a row is opened and the row's row count
1.80 mike 2078: is −1, then the user agent must mark the row as opening, and
2079: then must invoke the <code
2080: title="dom-listener-rowOpened">rowOpened()</code> method on the
2081: current <code title="dom-datagrid-listener">listener</code> with as
2082: its first argument a <code>RowID</code> object identifying the row
1.1 mike 2083: that was opened and as its second argument the boolean true.</p>
2084:
2085: <p>When a row is closed, the user agent must decrease the
1.80 mike 2086: <span><code>datagrid</code> row count</span> and the row counts of
1.1 mike 2087: any ancestor rows by the number of rows that the newly closed row
1.80 mike 2088: has in its row count, and then must invoke the <code
2089: title="dom-listener-rowOpened">rowOpened()</code> method on the
2090: current <code title="dom-datagrid-listener">listener</code> with as
2091: its first and only argument a <code>RowID</code> object identifying
1.1 mike 2092: the row that was opened.</p>
2093:
2094:
2095:
1.80 mike 2096: <h6>The cells</h6>
1.1 mike 2097:
2098: <p>Each row has one cell per column. Each cell has the same type as
1.80 mike 2099: its column. The <dfn>allowed <code>datagrid</code> column
1.1 mike 2100: types</dfn>, what they represent, and the requirements for when the
2101: user interacts with them, are as follows:</p>
2102:
1.80 mike 2103: <dl>
2104:
2105: <dt><dfn title="datagrid-type-text"><code>text</code></dfn></dt>
1.1 mike 2106: <dd>
2107:
2108: <p>The cell represents some text and an optional image.</p>
2109:
2110: </dd>
2111:
1.80 mike 2112: <dt><dfn title="datagrid-type-editable"><code>editable</code></dfn></dt>
1.1 mike 2113: <dd>
2114:
2115: <p>The cells represents some editable text, an optional
1.80 mike 2116: <code>datalist</code> giving autocompletion hints, and an
1.1 mike 2117: optional image.</p>
2118:
1.80 mike 2119: <p>If there is a <code>datalist</code> element, the user agent
1.1 mike 2120: should offer the suggestions represented by that element to the
1.80 mike 2121: user. The user agent may use the suggestion's <span
2122: title="concept-option-label">label</span> to identify the
1.1 mike 2123: suggestion. If the user selects a suggestion, then the editable
1.80 mike 2124: text must be set to the selected suggestion's <span
2125: title="concept-option-value">value</span>, as if the user had
1.1 mike 2126: written that value himself.</p>
2127:
2128: <p>When the user edits the value, either directly or using the
1.80 mike 2129: <code>datalist</code>, the user agent must invoke the <code
2130: title="dom-listener-cellChanged">cellChanged()</code> method on
2131: the current <code title="dom-datagrid-listener">listener</code>
2132: with as its first argument a <code>RowID</code> identifying the
1.1 mike 2133: cell's row, as its second argument the identifier of the cell's
2134: column, as its third argument the new value, and as its fourth
2135: argument the previous value.</p>
2136:
2137: </dd>
2138:
1.80 mike 2139: <dt><dfn title="datagrid-type-checkable"><code>checkable</code></dfn></dt>
1.1 mike 2140: <dd>
2141:
2142: <p>The cell represents some text, a check box that optionally has
2143: its value obscured as indeterminate, and an optional image.</p>
2144:
2145: <p>When the user checks or unchecks the check box, the user agent
2146: must change the check box's state appropriately and stop obscuring
2147: the check box as indeterminate (if it is obscuring it), and then
1.80 mike 2148: must invoke the <code
2149: title="dom-listener-cellChanged">cellChanged()</code> method on
2150: the current <code title="dom-datagrid-listener">listener</code>
2151: with as its first argument a <code>RowID</code> identifying the
1.1 mike 2152: cell's row, as its second argument the identifier of the cell's
2153: column, as its third argument true if the check box is now checked
2154: and false otherwise, and as its fourth argument true if the check
2155: box was previously checked and false otherwise.</p>
2156:
2157: </dd>
2158:
1.80 mike 2159: <dt><dfn title="datagrid-type-list"><code>list</code></dfn></dt>
1.1 mike 2160: <dd>
2161:
2162: <p>The cell represents some text giving the current value selected
1.80 mike 2163: from a dropdown list of options, a <code>select</code> element
1.1 mike 2164: giving the list of options, and an optional image.</p>
2165:
2166: <p>The user agent should allow the user to change the value of the
1.80 mike 2167: cell from its current value to one of the <span
2168: title="concept-option-value">values</span> given by
2169: <code>option</code> elements in the <span
2170: title="concept-select-option-list">list of options</span> (if
2171: any). The user agent may use the <code>option</code> elements'
2172: <span title="concept-option-label">labels</span> to annotate each
1.1 mike 2173: option.</p>
2174:
1.80 mike 2175: <p>When the user selects a new value from the <code>select</code>
2176: element's <span title="concept-select-option-list">list of
2177: options</span>, the user agent must invoke the <code
2178: title="dom-listener-cellChanged">cellChanged()</code> method on
2179: the current <code title="dom-datagrid-listener">listener</code>
2180: with as its first argument a <code>RowID</code> identifying the
1.1 mike 2181: cell's row, as its second argument the identifier of the cell's
2182: column, as its third argument the new value, and as its fourth
2183: argument the previous value.</p>
2184:
2185: </dd>
2186:
1.80 mike 2187: <dt><dfn title="datagrid-type-progress"><code>progress</code></dfn></dt>
1.1 mike 2188: <dd>
2189:
2190: <p>The cell represents a (determinate) progress bar whose value is
2191: between 0.0, indicating no progress, and 1.0, indicating the task
2192: is complete.</p>
2193:
2194: </dd>
2195:
1.80 mike 2196: <dt><dfn title="datagrid-type-meter"><code>meter</code></dfn></dt>
1.1 mike 2197: <dd>
2198:
2199: <p>The cell represents a gauge, described by one to six
2200: numbers.</p>
2201:
2202: <p>The gauge's actual value is given by the first number.</p>
2203:
2204: <p>If there is a second number, then that number is the maximum
2205: value. Otherwise, the maximum value is 1.0.</p>
2206:
2207: <p>If there is a third number, then that number is the minimum
2208: value. Otherwise, the minimum value is 1.0.</p>
2209:
2210: <p>If there is a fourth number, then that number is the low
2211: boundary. Otherwise, the low boundary is the minimum value.</p>
2212:
2213: <p>If there is a fifth number, then that number is the high
2214: boundary. Otherwise, the high boundary is the maximum value.</p>
2215:
2216: <p>If there is a sixth number, then the optimal point is the sixth
2217: number. Otherwise, the optimum point is the midpoint between the
2218: minimum value and the maximum value.</p>
2219:
1.80 mike 2220: <!- - next two paragraphs copied from <meter>: - ->
1.1 mike 2221:
2222: <p>If the optimum point is equal to the low boundary or the high
2223: boundary, or anywhere in between them, then the region between the
2224: low and high boundaries of the gauge must be treated as the
2225: optimum region, and the low and high parts, if any, must be
2226: treated as suboptimal. Otherwise, if the optimum point is less
2227: than the low boundary, then the region between the minimum value
2228: and the low boundary must be treated as the optimum region, the
2229: region between the low boundary and the high boundary must be
2230: treated as a suboptimal region, and the region between the high
2231: boundary and the maximum value must be treated as an even less
2232: good region. Finally, if the optimum point is higher than the high
2233: boundary, then the situation is reversed; the region between the
2234: high boundary and the maximum value must be treated as the optimum
2235: region, the region between the high boundary and the low boundary
2236: must be treated as a suboptimal region, and the remaining region
2237: between the low boundary and the minimum value must be treated as
2238: an even less good region.</p>
2239:
2240: <p>User agents should indicate the relative position of the actual
2241: value to the minimum and maximum values, and the relationship
2242: between the actual value and the three regions of the gauge.</p>
2243:
2244: </dd>
2245:
1.80 mike 2246: <dt><dfn title="datagrid-type-custom"><code>custom</code></dfn></dt>
1.1 mike 2247: <dd>
2248:
2249: <p>The cell represents a dynamically generated graphical image.</p>
2250:
2251: <p>The cell will have minimum dimensions (specified in CSS
2252: pixels), and a callback (in the form of a
1.80 mike 2253: <code>RenderingContext2DCallback</code> object) to get a rendering
1.1 mike 2254: for the cell.</p>
2255:
2256: <p>The user agent should not allow the cell to be rendered with
2257: dimensions less than the given minimum width and height.</p>
2258:
2259: <p>When the user agent needs to render the cell, the user agent
1.80 mike 2260: must <span>queue a task</span> to invoke the
2261: <span>RenderingContext2DCallback</span> callback, passing it a
2262: newly created <code>CanvasRenderingContext2D</code> object whose
1.186 mike 2263: <code title="dom-context-2d-canvas">canvas</code> IDL attribute is
1.1 mike 2264: null as the first argument, the actual cell width in CSS pixels as
2265: the second argument, and the actual cell height in CSS pixels as
2266: the third argument.</p>
2267:
2268: <p>If the user agent is able to render graphics, then it must
2269: render the graphics commands that the callback executed on the
1.80 mike 2270: provided <code>CanvasRenderingContext2D</code> object onto the
1.1 mike 2271: cell once the callback returns. The image must be clipped to the
2272: dimensions of the cell. The coordinate space of the cell must be
2273: aligned with that used by the 2D context such that the top left
2274: corner of the cell is the 0,0 origin, with the coordinate space
2275: increasing its <var title="">x</var> dimension towards the right
2276: of the cell and its <var title="">y</var> axis towards the bottom
2277: of the cell, and with the image not scaled (so that one CSS pixel
2278: on the final rendering matches one CSS pixel in the coordinate
2279: space used by the 2D context).</p>
2280:
2281: <p>The user agent must then decouple the
1.80 mike 2282: <code>CanvasRenderingContext2D</code> object and any objects that
2283: it created (such as <code>CanvasPattern</code> objects or
2284: <code>ImageData</code> objects) from any real drawing surface.</p>
1.1 mike 2285:
2286: <p>If the user agent is unable to render graphics, then it must
2287: render the text string returned by the callback instead.</p>
2288:
2289: </dd>
2290:
1.80 mike 2291: </dl>
2292:
2293: <hr>
2294:
2295: <p>When an algorithm requires the user agent to <dfn>apply a
1.1 mike 2296: <code>Row</code> object</dfn>, the user agent must run the following
2297: steps:</p>
2298:
1.80 mike 2299: <ol>
2300:
2301: <li>
2302:
2303: <p>If the value of the <code>Row</code> object's second entry is
2304: not −1, then run these substeps:</p>
1.1 mike 2305:
1.80 mike 2306: <ol>
1.1 mike 2307:
1.80 mike 2308: <li><p>If there is a row with the same parent as the row
2309: specified by the <code>Row</code> object's <code>RowID</code>
1.1 mike 2310: object, whose display order position is currently the same as the
1.80 mike 2311: value of the <code>Row</code> object's second entry, then remove
2312: that row from the <span>display order sparse data
2313: tree</span>.</p></li>
1.1 mike 2314:
2315: <li><p>Set the display order position of the row specified by the
1.80 mike 2316: <code>Row</code> object's <code>RowID</code> to the value of the
2317: <code>Row</code> object's second entry, updating its position in
2318: the <span>display order sparse data tree</span>
1.1 mike 2319: accordingly.</p></li>
2320:
1.80 mike 2321: <li><p>If the row is in the <span>pending
2322: <code>datagrid</code> rows list</span>, remove it.</p></li>
2323:
2324: </ol>
1.1 mike 2325:
1.80 mike 2326: </li>
1.1 mike 2327:
2328: <li>
2329:
1.80 mike 2330: <p>If the fourth entry in the <code>Row</code> object (a
2331: <code>CellList</code> object, an array) is not empty, then for
2332: each <code>Cell</code> object in that array update the cell that
1.1 mike 2333: corresponds to the column identified by the value of the first
1.80 mike 2334: entry of the <code>Cell</code> object, by using the appropriate
1.1 mike 2335: set of steps given below as determined by the type of the
1.80 mike 2336: column. Then, if the cell is in the <span>pending
2337: <code>datagrid</code> cells list</span>, remove it.</p>
1.1 mike 2338:
1.80 mike 2339: <dl>
2340:
2341: <dt>If the column's type is <code title="datagrid-type-text">text</code></dt>
1.1 mike 2342: <dd>
2343:
2344: <p>Update the cell's text to the value given in the
1.80 mike 2345: <code>Cell</code> object's second entry.</p>
1.1 mike 2346:
1.80 mike 2347: <p>If the <code>Cell</code> object has three entries, then copy
2348: the image data from the <code>img</code> element given in the
1.1 mike 2349: third entry, and let the cell's image be given by that image
2350: data. Otherwise, update the cell to have no image.</p>
2351:
2352: </dd>
2353:
1.80 mike 2354: <dt>If the column's type is <code title="datagrid-type-editable">editable</code></dt>
1.1 mike 2355: <dd>
2356:
2357: <p>Update the cell's text to the value given in the
1.80 mike 2358: <code>Cell</code> object's second entry.</p>
1.1 mike 2359:
1.80 mike 2360: <p>If the <code>Cell</code> object has three entries, then let
2361: the <code>datalist</code> element given in the third entry be
2362: the <code>datalist</code> element giving autocompletion
1.1 mike 2363: hints. Otherwise, update the cell to have no
1.80 mike 2364: <code>datalist</code> element.</p>
1.1 mike 2365:
1.80 mike 2366: <p>If the <code>Cell</code> object has four entries, then copy
2367: the image data from the <code>img</code> element given in the
1.1 mike 2368: fourth entry, and let the cell's image be given by that image
2369: data. Otherwise, update the cell to have no image.</p>
2370:
2371: </dd>
2372:
1.80 mike 2373: <dt>If the column's type is <code title="datagrid-type-checkable">checkable</code></dt>
1.1 mike 2374: <dd>
2375:
2376: <p>Update the cell's text to the value given in the
1.80 mike 2377: <code>Cell</code> object's second entry.</p>
1.1 mike 2378:
2379: <p>Update the cell's checked state to match the value of the
2380: third entry: checked if true, unchecked otherwise.</p>
2381:
1.80 mike 2382: <p>If the <code>Cell</code> object has four entries and the
1.1 mike 2383: fourth entry is true, then update the cell to be obscured as
2384: indeterminate. Otherwise, the cell's state is not obscured.</p>
2385:
1.80 mike 2386: <p>If the <code>Cell</code> object has five entries, then copy
2387: the image data from the <code>img</code> element given in the
1.1 mike 2388: fifth entry, and let the cell's image be given by that image
2389: data. Otherwise, update the cell to have no image.</p>
2390:
2391: </dd>
2392:
1.80 mike 2393: <dt>If the column's type is <code title="datagrid-type-list">list</code></dt>
1.1 mike 2394: <dd>
2395:
2396: <p>Update the cell's text to the value given in the
1.80 mike 2397: <code>Cell</code> object's second entry, and the
2398: <code>select</code> element to be the one given in the
2399: <code>Cell</code> object's third entry</p>
1.1 mike 2400:
1.80 mike 2401: <p>If the <code>Cell</code> object has four entries, then copy
2402: the image data from the <code>img</code> element given in the
1.1 mike 2403: fourth entry, and let the cell's image be given by that image
2404: data. Otherwise, update the cell to have no image.</p>
2405:
2406: </dd>
2407:
1.80 mike 2408: <dt>If the column's type is <code title="datagrid-type-progress">progress</code></dt>
1.1 mike 2409: <dd>
2410:
2411: <p>Update the cell to be a progress bar whose progress, on the
2412: scale of 0.0 (no progress) to 1.0 (task complete) is given by
1.80 mike 2413: the value in the <code>Cell</code> object's second entry.</p>
1.1 mike 2414:
2415: </dd>
2416:
1.80 mike 2417: <dt>If the column's type is <code title="datagrid-type-meter">meter</code></dt>
1.1 mike 2418: <dd>
2419:
2420: <p>Update the cell to be a gauge configured with the numbers
2421: given by the second and subsequent entries of the
1.80 mike 2422: <code>Cell</code> object.</p>
1.1 mike 2423:
2424: </dd>
2425:
1.80 mike 2426: <dt>If the column's type is <code title="datagrid-type-custom">custom</code></dt>
1.1 mike 2427: <dd>
2428:
2429: <p>Update the cell's minimum width to be the length in CSS
1.80 mike 2430: pixels given by the <code>Cell</code> object's second entry.</p>
1.1 mike 2431:
2432: <p>Update the cell's minimum height to be the length in CSS
1.80 mike 2433: pixels given by the <code>Cell</code> object's third entry.</p>
1.1 mike 2434:
2435: <p>Update the cell's callback to be the
1.80 mike 2436: <code>RenderingContext2DCallback</code> object given by the
2437: <code>Cell</code> object's fourth entry.</p>
1.1 mike 2438:
2439: </dd>
2440:
1.80 mike 2441: </dl>
2442:
2443: </li>
1.1 mike 2444:
1.80 mike 2445: </ol>
2446:
2447: <hr>
2448:
2449: <p>When the user agent is to run the <dfn><code>datagrid</code>
2450: update display algorithm</dfn>, the user agent must invoke the <code
2451: title="dom-listener-getRows">getRows()</code> and <code
2452: title="dom-listener-getCells">getCells()</code> methods on the
2453: current <code title="dom-datagrid-listener">listener</code> such
2454: that all the current visible rows in the <span>display order sparse
2455: data list</span>, and all the cells in the currently visible columns
1.1 mike 2456: on all the currently visible rows, have been covered.</p>
2457:
1.80 mike 2458: <p>A row is considered covered if it is present in the <span>pending
2459: <code>datagrid</code> rows list</span>, or if the <code
2460: title="dom-listener-getRows">getRows()</code> method is invoked with
1.1 mike 2461: a range that includes the row in question.</p>
2462:
2463: <p>A cell is considered covered if it is present in the
1.80 mike 2464: <span>pending <code>datagrid</code> cells list</span>, or if the
2465: <code title="dom-listener-getRows">getRows()</code> method is
1.1 mike 2466: invoked with a range that includes the row in question and a list of
1.80 mike 2467: columns that includes the cell's column, or if the <code
2468: title="dom-listener-getCells">getCells()</code> method is invoked
1.1 mike 2469: with a list of rows and columns that intersects the cell in
1.80 mike 2470: question. However, the <code
2471: title="dom-listener-getCells">getCells()</code> method can only be
2472: used if the row is already present in the <span>display order sparse
2473: data list</span>.</p>
1.1 mike 2474:
1.80 mike 2475: <p>The <code title="dom-listener-getRows">getRows()</code> method,
1.1 mike 2476: if used, must be invoked with five arguments. The first argument
1.80 mike 2477: must be the index in the <span>display order sparse data list</span>
1.1 mike 2478: to the first row that the user agent is requesting, known as the
2479: <i>anchor row</i>. The second argument must be the number of
2480: consecutive cells for which the user agent is requesting
1.80 mike 2481: information. The third argument must be the <code>RowID</code> of
2482: the row that is the nearest ancestor in the <span>display order
2483: sparse data <em>tree</em></span> of the anchor row. If this is the
2484: <code>datagrid</code>, then the <code>RowID</code> object must be an
1.1 mike 2485: empty array. The fourth argument must be the display order position
1.80 mike 2486: of the anchor row in the <span>display order sparse data
2487: tree</span>, assuming that the row identified in the third argument
1.1 mike 2488: is indeed the anchor row's parent row. The fifth and final argument
2489: must be an array of the identifiers of the columns for which the
2490: user agent is requesting information, in the order they were added
1.80 mike 2491: to the <code>datagrid</code>.</p>
1.1 mike 2492:
1.80 mike 2493: <p>As the <code title="dom-listener-getRows">getRows()</code> method
2494: is invoked, the <span>pending <code>datagrid</code> rows list</span>
1.1 mike 2495: must be updated to include the rows for which information has been
2496: requested, excluding rows for which information is already
1.80 mike 2497: available; and the <span>pending <code>datagrid</code> cells
2498: list</span> must be updated to include the cells for which
1.1 mike 2499: information has been requested on those rows.</p>
2500:
1.80 mike 2501: <p>The <code title="dom-listener-getCells">getCells()</code> method,
1.1 mike 2502: if used, must be invoked with two arguments. The first argument must
1.80 mike 2503: be an array of <code>RowID</code> objects identifying the rows for
1.1 mike 2504: which information is being requested. The second argument must be an
2505: array of the identifiers of the columns for which the user agent is
2506: requesting information, in the order they were added to the
1.80 mike 2507: <code>datagrid</code>.</p>
1.1 mike 2508:
1.80 mike 2509: <p>As the <code title="dom-listener-getCells">getCells()</code>
2510: method is invoked, the <span>pending <code>datagrid</code> cells
2511: list</span> must be updated to include the cells for which
1.1 mike 2512: information has been requested.</p>
2513:
2514: <p>Calls to these methods should be batched so that the rows and
2515: cells to be covered are handled by the fewest number of calls to
2516: these methods as possible. To this end, user agents may invoke the
1.80 mike 2517: <code title="dom-listener-getRows">getRows()</code> method for a set
1.1 mike 2518: of rows that includes some rows that are already in the
1.80 mike 2519: <span>display order sparse data list</span>, and similarly may
2520: invoke the <code title="dom-listener-getCells">getCells()</code>
1.1 mike 2521: method with row/column combinations that cover some cells for which
2522: data is already known. Generally, however, user agents should avoid
2523: invoking these methods with arguments that cause information to be
2524: requested when it has already been requested or is already
2525: known.</p>
2526:
2527: <div class="example">
2528:
2529: <p>For example, consider a case represented by the following table,
2530: where the cells marked "Yes" indicate that the data has already
2531: been obtained, the cells marked "Pending" indicate that the data
2532: has been previously requested but not yet obtained, and the cells
2533: with just a dash indicate that no information has ever been
2534: obtained, or any information that had been obtained has now been
2535: discarded.</p>
2536:
1.80 mike 2537: <table>
2538: <tr> <td> <th> Row <th> Column A <th> Column B
2539: <tr> <th> Row 1 <td> - <td> - <td> -
2540: <tr> <th> Row 2 <td> Yes <td> Yes <td> Yes
2541: <tr> <th> Row 3 <td> Yes <td> Yes <td> Yes
2542: <tr> <th> Row 4 <td> Yes <td> Yes <td> Yes
2543: <tr> <th> Row 5 <td> - <td> - <td> -
2544: <tr> <th> Row 6 <td> - <td> - <td> -
2545: <tr> <th> Row 7 <td> Yes <td> Pending <td> -
2546: <tr> <th> Row 8 <td> Yes <td> Pending <td> Pending
2547: </table>
2548:
2549: <p>Thus, rows 2, 3, 4, 7, and 8 are already covered, as are the
1.1 mike 2550: cells from those rows except for the cell in column B of row 7.</p>
2551:
2552: <p>Now consider what happens if all of these rows become visible at
2553: once. The user agent has several choices, including (but not
2554: limited to) the following:</p>
2555:
1.80 mike 2556: <ul>
2557:
2558: <li>Fire the <code title="dom-listener-getRows">getRows()</code>
1.1 mike 2559: method for rows 1 through 8 and columns A and B all at once.</li>
2560:
1.80 mike 2561: <li>Fire the <code title="dom-listener-getRows">getRows()</code>
1.1 mike 2562: method for row 1, then fire it again for rows 5 through 7.</li>
2563:
1.80 mike 2564: <li>Fire the <code title="dom-listener-getRows">getRows()</code>
1.1 mike 2565: method for row 1, then fire it again for rows 5 and 6, and then
1.80 mike 2566: fire the <code title="dom-listener-getCells">getCells()</code>
1.1 mike 2567: method for row 7 column B.</li>
2568:
1.80 mike 2569: </ul>
2570:
2571: <p>All three options are allowed, but the latter two are preferable
1.1 mike 2572: to the former, as they minimise the amount of redundant information
2573: requested.</p>
2574:
2575: <p>In any case, the data model now looks like this:</p>
2576:
1.80 mike 2577: <table>
2578: <tr> <td> <th> Row <th> Column A <th> Column B <th> Column C
2579: <tr> <th> Row 1 <td> Pending <td> Pending <td> Pending <td> -
2580: <tr> <th> Row 2 <td> Yes <td> Yes <td> Yes <td> -
2581: <tr> <th> Row 3 <td> Yes <td> Yes <td> Yes <td> -
2582: <tr> <th> Row 4 <td> Yes <td> Yes <td> Yes <td> -
2583: <tr> <th> Row 5 <td> Pending <td> Pending <td> Pending <td> -
2584: <tr> <th> Row 6 <td> Pending <td> Pending <td> Pending <td> -
2585: <tr> <th> Row 7 <td> Yes <td> Pending <td> Pending <td> -
2586: <tr> <th> Row 8 <td> Yes <td> Pending <td> Pending <td> -
2587: </table>
2588:
2589: <p>Now consider the case where a third column, column C, is added
1.1 mike 2590: to the data model. The user agent once again has several choices,
2591: including (but not limited to) the following:</p>
2592:
1.80 mike 2593: <ul>
2594:
2595: <li>Fire the <code title="dom-listener-getRows">getRows()</code>
1.1 mike 2596: method for rows 1 through 8 again, this time listing just column
2597: C.</li>
2598:
1.80 mike 2599: <li>Fire the <code title="dom-listener-getRows">getRows()</code>
1.1 mike 2600: method for row 1, then fire it again for rows 5 and 6, and then
1.80 mike 2601: fire the <code title="dom-listener-getCells">getCells()</code>
1.1 mike 2602: method for the other rows (in all three cases, listing just column
2603: C).</li>
2604:
1.80 mike 2605: </ul>
2606:
2607: <p>The two options here are as bad as each other; the former
1.1 mike 2608: involves a lot of overlap, but the latter involves a lot of method
2609: calls. Unfortunately the user agent can't do the obvious thing,
1.80 mike 2610: namely just to invoke the <code
2611: title="dom-listener-getCells">getCells()</code> method for all the
1.1 mike 2612: rows listing just column C, because it doesn't have the row
2613: information for all the rows yet (rows 1, 5 and 6 are still
2614: pending).</p>
2615:
2616: <p>In any case, the data model now looks like this:</p>
2617:
1.80 mike 2618: <table>
2619: <tr> <td> <th> Row <th> Column A <th> Column B <th> Column C
2620: <tr> <th> Row 1 <td> Pending <td> Pending <td> Pending <td> Pending
2621: <tr> <th> Row 2 <td> Yes <td> Yes <td> Yes <td> Pending
2622: <tr> <th> Row 3 <td> Yes <td> Yes <td> Yes <td> Pending
2623: <tr> <th> Row 4 <td> Yes <td> Yes <td> Yes <td> Pending
2624: <tr> <th> Row 5 <td> Pending <td> Pending <td> Pending <td> Pending
2625: <tr> <th> Row 6 <td> Pending <td> Pending <td> Pending <td> Pending
2626: <tr> <th> Row 7 <td> Yes <td> Pending <td> Pending <td> Pending
2627: <tr> <th> Row 8 <td> Yes <td> Pending <td> Pending <td> Pending
2628: </table>
2629:
2630: <p>If at this point the user scrolls around anywhere within this
2631: <code>datagrid</code>, the user agent won't fire the <code
2632: title="dom-listener-getRows">getRows()</code> and <code
2633: title="dom-listener-getCells">getCells()</code> methods, because
1.1 mike 2634: all of the rows and cells are covered.</p>
2635:
2636: <p>Now consider the case where the user agent receives row
2637: information, but no cell information, for rows 1, 5, and 6:</p>
2638:
1.80 mike 2639: <table>
2640: <tr> <td> <th> Row <th> Column A <th> Column B <th> Column C
2641: <tr> <th> Row 1 <td> Yes <td> Pending <td> Pending <td> Pending
2642: <tr> <th> Row 2 <td> Yes <td> Yes <td> Yes <td> Pending
2643: <tr> <th> Row 3 <td> Yes <td> Yes <td> Yes <td> Pending
2644: <tr> <th> Row 4 <td> Yes <td> Yes <td> Yes <td> Pending
2645: <tr> <th> Row 5 <td> Yes <td> Pending <td> Pending <td> Pending
2646: <tr> <th> Row 6 <td> Yes <td> Pending <td> Pending <td> Pending
2647: <tr> <th> Row 7 <td> Yes <td> Pending <td> Pending <td> Pending
2648: <tr> <th> Row 8 <td> Yes <td> Pending <td> Pending <td> Pending
2649: </table>
2650:
2651: <p>The user agent still won't fire any methods when the user
1.1 mike 2652: scrolls, because the data is still covered. But if the script then
1.80 mike 2653: calls the <code title="dom-datagrid-renotify">renotify()</code>
1.1 mike 2654: method, the "Pending" flags would get reset, and the model would
2655: now look like this:</p>
2656:
1.80 mike 2657: <table>
2658: <tr> <td> <th> Row <th> Column A <th> Column B <th> Column C
2659: <tr> <th> Row 1 <td> Yes <td> - <td> - <td> -
2660: <tr> <th> Row 2 <td> Yes <td> Yes <td> Yes <td> -
2661: <tr> <th> Row 3 <td> Yes <td> Yes <td> Yes <td> -
2662: <tr> <th> Row 4 <td> Yes <td> Yes <td> Yes <td> -
2663: <tr> <th> Row 5 <td> Yes <td> - <td> - <td> -
2664: <tr> <th> Row 6 <td> Yes <td> - <td> - <td> -
2665: <tr> <th> Row 7 <td> Yes <td> - <td> - <td> -
2666: <tr> <th> Row 8 <td> Yes <td> - <td> - <td> -
2667: </table>
2668:
2669: <p>Now, assuming that all eight rows and all three columns are
1.1 mike 2670: still visible, the user agent has the following choices (amongst
2671: others):</p>
2672:
1.80 mike 2673: <ul>
2674:
2675: <li>Fire the <code title="dom-listener-getRows">getCells()</code>
1.1 mike 2676: method for rows 1 through 8, listing all three columns.</li>
2677:
1.80 mike 2678: <li>Fire the <code title="dom-listener-getRows">getCells()</code>
1.1 mike 2679: method for rows 1 and 5 through 8, listing all three columns, and
2680: then fire the method for rows 2 through 4, listing just column
2681: C.</li>
2682:
1.80 mike 2683: <li>Fire the <code title="dom-listener-getRows">getCells()</code>
1.1 mike 2684: method for rows 1 and 5 through 8, listing just columns A abd B,
2685: and then fire the method for rows 1 through 8, listing just column
2686: C.</li>
2687:
1.80 mike 2688: </ul>
2689:
2690: <p>Here the latter two are preferable because they result in less
1.1 mike 2691: overlap than the first.</p>
2692:
2693: </div>
2694:
1.80 mike 2695: <hr>
2696:
2697: <p>The <span>task source</span> for tasks queued on behalf of a
2698: <code>datagrid</code> is the <span>DOM manipulation task
2699: source</span>.</p>
2700:
2701: </div>
2702:
2703:
2704: <h5>Listening to notifications from the <code>datagrid</code></h5>
1.1 mike 2705:
1.80 mike 2706: <p><i>The conformance criteria in this section apply to any
2707: implementation of the <code>DataGridListener</code> interface,
1.1 mike 2708: including (and most commonly) the content author's
1.80 mike 2709: implementation(s).</i></p>
2710:
2711: <pre class="idl">// To be implemented by Web authors as a JS object
1.81 mike 2712: [NoInterfaceObject]
2713: interface <dfn>DataGridListener</dfn> {
1.80 mike 2714: void <span title="dom-listener-initialize">initialize</span>(in <span>HTMLDataGridElement</span> datagrid);
2715:
2716: void <span title="dom-listener-getRows">getRows</span>(in unsigned long rowIndex, in unsigned long rowCount, in <span>RowID</span> parentRow, in unsigned long position, in <span>ColumnList</span> columns);
2717: void <span title="dom-listener-getCells">getCells</span>(in <span>RowIDList</span> rows, in <span>ColumnList</span> columns);
2718: void <span title="dom-listener-rowOpened">rowOpened</span>(in <span>RowID</span> row, in boolean rowCountNeeded);
2719: void <span title="dom-listener-rowClosed">rowClosed</span>(in <span>RowID</span> row);
2720:
2721: void <span title="dom-listener-cellChanged">cellChanged</span>(in <span>RowID</span> row, in <span>Column</span> column, in any newValue, in any prevValue);
2722: <span>HTMLMenuElement</span> <span title="dom-listener-getRowMenu">getRowMenu</span>(in <span>RowID</span> row);
2723: <!- -vsDGDND
1.1 mike 2724: boolean <span title="dom-listener-canDrop">canDrop</span>(in <span>RowID</span> row, in <span>RowID</span> position, data);
2725: boolean <span title="dom-listener-dropped">dropped</span>(in <span>RowID</span> row, in <span>RowID</span> position, data);
1.80 mike 2726: - -><!- -v2DGPA
1.1 mike 2727: void <span title="dom-listener-performAction">performAction</span>(in <span>RowID</span> row, in DOMString action);
1.80 mike 2728: - ->};</pre>
2729:
2730: <p>The <code>DataGridListener</code> interface, once implemented by
2731: an object in a script and hooked up to a <code>datagrid</code> using
1.186 mike 2732: the <code title="dom-datagrid-listener">listener</code> IDL
1.80 mike 2733: attribute, receives notifications when the <code>datagrid</code>
2734: needs information (such as which rows exist) for display.</p>
2735:
2736: <p>The following methods may be usefully implemented:</p>
2737:
2738: <dl>
2739:
2740: <dt><dfn title="dom-listener-initialize"><code>initialize(<var title="">datagrid</var>)</code></dfn></dt>
1.1 mike 2741:
2742: <dd>
2743:
1.80 mike 2744: <p>Called by the <code>datagrid</code> element (the one given by
2745: the <var title="">datagrid</var> argument) when the <code
2746: title="dom-datagrid-listener">listener</code> attribute is
1.1 mike 2747: set.</p>
2748:
2749: </dd>
2750:
1.80 mike 2751: <dt><dfn title="dom-listener-getRows"><code>getRows(<var title="">rowIndex</var>, <var title="">rowCount</var>, <var title="">parentRow</var>, <var title="">position</var>, <var title="">columns</var>)</code></dfn></dt>
1.1 mike 2752:
2753: <dd>
2754:
1.80 mike 2755: <p>Called by the <code>datagrid</code> element when the user agent
1.1 mike 2756: finds itself needing to render rows for which it is lacking
2757: information.</p>
2758:
2759: <p>The <var title="">rowIndex</var> argument gives the flattened
2760: index of the first row for which it needs information, ignoring
1.80 mike 2761: the tree structure of the <code>datagrid</code> model, where zero
1.1 mike 2762: is the first row of the entire tree.</p>
2763:
2764: <p>The <var title="">rowCount</var> argument gives the number of
2765: rows for which the user agent would like information.</p>
2766:
2767: <p>The <var title="">parentRow</var> argument gives the
1.80 mike 2768: <code>RowID</code> object identifying the nearest ancestor of the
1.1 mike 2769: first row that the user agent is aware of. After the sort order
2770: has changed, this will typically be the root of the tree
1.80 mike 2771: (identified by a <code>RowID</code> object consisting of an empty
1.1 mike 2772: array).
2773:
1.80 mike 2774: <p>The <var title="">columns</var> argument gives the columns for
1.1 mike 2775: which the user agent is lacking information, as an array of column
1.80 mike 2776: identifiers (as passed to <code
2777: title="dom-datagrid-addColumn">addColumn()</code>).</p>
1.1 mike 2778:
2779: </dd>
2780:
1.80 mike 2781: <dt><dfn title="dom-listener-getCells"><code>getCells(<var title="">rows</var>, <var title="">columns</var>)</code></dfn></dt>
1.1 mike 2782:
2783: <dd>
2784:
1.80 mike 2785: <p>Called by the <code>datagrid</code> element when the user agent
1.1 mike 2786: finds itself needing to render cells for which it is lacking
2787: information in rows that it does know about.</p>
2788:
2789: <p>The <var title="">rows</var> argument gives an array of
1.80 mike 2790: <code>RowID</code> objects identifying the various rows for which
1.1 mike 2791: the user agent is lacking information.</p>
2792:
2793: <p>The <var title="">columns</var> argument gives the columns for
2794: which the user agent is lacking information, as an array of column
1.80 mike 2795: identifiers (as passed to <code
2796: title="dom-datagrid-addColumn">addColumn()</code>).</p>
1.1 mike 2797:
2798: </dd>
2799:
1.80 mike 2800: <dt><dfn title="dom-listener-rowOpened"><code>rowOpened(<var title="">row</var>, <var title="">rowCountNeeded</var>)</code></dfn></dt>
1.1 mike 2801:
2802: <dd>
2803:
1.80 mike 2804: <p>Called by the <code>datagrid</code> element when the user has
1.1 mike 2805: opened a row.</p>
2806:
2807: <p>The <var title="">row</var> argument gives an
1.80 mike 2808: <code>RowID</code> object identifying the row that was opened.</p>
1.1 mike 2809:
2810: <p>If the user agent also knows how many children that row has,
2811: then the <var title="">rowCountNeeded</var> argument will be
2812: false. Otherwise, the argument will be true, and the row will
1.80 mike 2813: remain closed until the <code
2814: title="dom-datagrid-setRows">setRows()</code> method is called
1.1 mike 2815: with an accurate row count.</p>
2816:
2817: </dd>
2818:
1.80 mike 2819: <dt><dfn title="dom-listener-rowClosed"><code>rowClosed(<var title="">row</var>)</code></dfn></dt>
1.1 mike 2820:
2821: <dd>
2822:
1.80 mike 2823: <p>Called by the <code>datagrid</code> element when the user has
1.1 mike 2824: opened a row.</p>
2825:
2826: <p>The <var title="">row</var> argument gives an
1.80 mike 2827: <code>RowID</code> object identifying the row that was closed.</p>
1.1 mike 2828:
2829: </dd>
2830:
1.80 mike 2831: <dt><dfn title="dom-listener-cellChanged"><code>cellChanged(<var title="">row</var>, <var title="">column</var>, <var title="">newValue</var>, <var title="">prevValue</var>)</code></dfn></dt>
1.1 mike 2832:
2833: <dd>
2834:
1.80 mike 2835: <p>Called by the <code>datagrid</code> element when the user has
1.1 mike 2836: edited a cell or checked a check box in a cell.</p>
2837:
2838: <p>The <var title="">row</var> argument gives an
1.80 mike 2839: <code>RowID</code> object identifying the row of the cell, and the
1.1 mike 2840: <var title="">column</var> argument gives the identifier of the
2841: cell's column.</p>
2842:
2843: <p>The <var title="">newValue</var> argument gives the new value,
2844: and the <var title="">prevValue</var> argument gives the previous
2845: value.</p>
2846:
2847: </dd>
2848:
1.80 mike 2849: <dt><dfn title="dom-listener-getRowMenu"><code>getRowMenu(<var title="">row</var>)</code></dfn></dt>
1.1 mike 2850:
1.80 mike 2851: <dd>Must return an <code>HTMLMenuElement</code> object that is to
1.1 mike 2852: be used as a context menu for row <var title="">row</var>, or null
2853: if there is no particular context menu. May be omitted if none of
2854: the rows have a special context menu. As this method is called
2855: immediately before showing the menu in question, no precautions
2856: need to be taken if the return value of this method changes.</dd>
2857:
1.80 mike 2858: <!- -v2DGDND, v2DFPA- ->
1.1 mike 2859:
1.80 mike 2860: </dl>
2861:
2862: <div class="impl">
1.1 mike 2863:
1.80 mike 2864: <p>Objects that implement the <code>DataGridListener</code>
1.1 mike 2865: interface may omit any or all of the methods. When a method is
2866: omitted, a user agent intending to call that method must instead
2867: skip the method call, and must assume that the method's return value
2868: is null.</p>
2869:
1.80 mike 2870: </div>
2871:
2872:
2873:
2874: <!- - v2DGS: <datagrid> selection (search for the bits marked "..." to see what needs filling in, at a minimum)
1.1 mike 2875:
2876: <h5>The selection</h5>
2877:
2878: <pre class="idl">interface <dfn>DataGridSelection</dfn> {
2879: readonly attribute unsigned long <span title="dom-DataGridSelection-length">length</span>;
1.81 mike 2880: getter <span>RowID</span> <span title="dom-DataGridSelection-item">item</span>(in unsigned long index);
1.1 mike 2881: boolean <span title="dom-DataGridSelection-isSelected">isSelected</span>(in <span>RowID</span> row);
2882: void <span title="dom-DataGridSelection-setSelected">setSelected</span>(in <span>RowID</span> row, in boolean selected);
2883: void <span title="dom-DataGridSelection-selectAll">selectAll</span>();
2884: void <span title="dom-DataGridSelection-clear">clear</span>();
2885: };</pre>
2886:
2887: <dl class="domintro">
2888:
2889: ...
2890:
2891: </dl>
2892:
2893: <div class="impl">
2894:
2895: <p>Each <code>datagrid</code> element must keep track of which rows
2896: are currently selected. Initially, no rows are selected. This can be
2897: changed using the methods described in this section.</p>
2898:
2899: <p>The selection of a <code>datagrid</code> is represented by its
1.186 mike 2900: <dfn title="dom-datagrid-selection"><code>selection</code></dfn> IDL
1.1 mike 2901: attribute, which must be a <code>DataGridSelection</code> object.</p>
2902:
2903: <p><code>DataGridSelection</code> objects represent the rows in the
2904: selection. In the selection the rows must be ordered in their
2905: natural order (and not, e.g., the display order). A row with an
2906: ancestor that is closed cannot be selected.</p>
2907:
2908: <p>The <dfn
2909: title="dom-DataGridSelection-length"><code>length</code></dfn>
2910: attribute must return the number of rows currently present in the
2911: selection. This is the <var
2912: title="dom-DataGridSelection-length">length</var>.</p>
2913:
2914: <p>The object's <span>indices of the supported indexed
2915: properties</span> are the numbers in the range zero to <span title=""><var
2916: title="dom-DataGridSelection-length">length</var>-1</span>, unless
2917: the <var title="dom-DataGridSelection-length">length</var> is zero,
2918: in which case there are no <span>supported indexed
2919: properties</span>.</p>
2920:
2921: <p>The <dfn title="dom-DataGridSelection-item"><code>item(<var
2922: title="">index</var>)</code></dfn> method must return a
2923: <code>RowID</code> object identifying the <var
2924: title="">index</var>th row in the selection. If the argument is out
2925: of range (less than zero or greater than the number of selected rows
2926: minus one), then it must raise an <code>INDEX_SIZE_ERR</code>
1.98 mike 2927: exception. <a href="#refsDOMCORE">[DOMCORE]</a></p>
1.1 mike 2928:
2929: <p>The <dfn
2930: title="dom-DataGridSelection-isSelected"><code>isSelected()</code></dfn>
2931: method must return the selected state of the row specified by its
2932: argument. If the specified row is in the <span>natural order sparse
2933: data tree</span> and is selected, the method must return true,
2934: otherwise it must return false.</p>
2935:
2936: <p>The <dfn
2937: title="dom-DataGridSelection-setSelected"><code>setSelected()</code></dfn>
2938: method takes two arguments, <var title="">row</var> and <var
2939: title="">selected</var>. When invoked, it must set the selection
2940: state of row <var title="">row</var> to selected if <var
2941: title="">selected</var> is true, and unselected if it is false. If
2942: <var title="">row</var> does not specify a row in the <span>natural
2943: order sparse data tree</span> ...
2944:
2945: <p>The <dfn
2946: title="dom-DataGridSelection-selectAll"><code>selectAll()</code></dfn>
2947: method must ...
2948:
2949: <p>The <dfn
2950: title="dom-DataGridSelection-clear"><code>clear()</code></dfn>
2951: method must mark all the rows in the <code>datagrid</code> as not
2952: selected. After a call to <code
2953: title="dom-DataGridSelection-clear">clear()</code>, the <code
2954: title="dom-DataGridSelection-length">length</code> attribute will
2955: return zero.</p>
2956:
2957: <p>If the <code>datagrid</code> element has a <code
2958: title="attr-datagrid-multiple">multiple</code> attribute, then the
2959: user agent should allow the user to select any number of rows (zero
2960: or more). If the attribute is not present, then the user agent
2961: should allow the user to select a row, and must not allow the user
2962: to select more than a single row at a time; selecting another one
2963: must unselect all the other rows.</p>
2964:
2965: <p class="note">This only applies to the user. Scripts can select
2966: multiple rows even when the <code
2967: title="attr-datagrid-multiple">multiple</code> attribute is
2968: absent.</p>
2969:
2970: ...event on selection change?...
2971:
2972: </div>
2973:
2974: <p class="note">The <code>DataGridSelection</code> interface has no
2975: relation to the <code>Selection</code> interface.</p>
2976:
1.80 mike 2977: - ->
2978:
2979:
2980: <!- -vsDGDND
1.1 mike 2981: <h5>Drag and drop in <code>datagrid</code>s</h5>
2982:
2983: <p><i>This section only applies to interactive user agents.</i></p>
2984:
2985: ...define drag and drop in datagrids; selectiondraggable...
1.80 mike 2986: - ->
2987:
1.729 mike 2988: --><h4 id="the-command"><span class="secno">4.11.3 </span>The <dfn><code>command</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><dl class="element"><dt>Categories</dt>
1.153 mike 2989: <dd><a href="dom.html#metadata-content">Metadata content</a>.</dd>
2990: <dd><a href="dom.html#flow-content">Flow content</a>.</dd>
2991: <dd><a href="dom.html#phrasing-content">Phrasing content</a>.</dd>
1.1 mike 2992: <dt>Contexts in which this element may be used:</dt>
1.153 mike 2993: <dd>Where <a href="dom.html#metadata-content">metadata content</a> is expected.</dd>
2994: <dd>Where <a href="dom.html#phrasing-content">phrasing content</a> is expected.</dd>
1.1 mike 2995: <dt>Content model:</dt>
2996: <dd>Empty.</dd>
2997: <dt>Content attributes:</dt>
2998: <dd><a href="dom.html#global-attributes">Global attributes</a></dd>
2999: <dd><code title="attr-command-type"><a href="#attr-command-type">type</a></code></dd>
3000: <dd><code title="attr-command-label"><a href="#attr-command-label">label</a></code></dd>
3001: <dd><code title="attr-command-icon"><a href="#attr-command-icon">icon</a></code></dd>
3002: <dd><code title="attr-command-disabled"><a href="#attr-command-disabled">disabled</a></code></dd>
3003: <dd><code title="attr-command-checked"><a href="#attr-command-checked">checked</a></code></dd>
3004: <dd><code title="attr-command-radiogroup"><a href="#attr-command-radiogroup">radiogroup</a></code></dd>
3005: <!--<dd><code title="attr-command-default">default</code></dd>-->
3006: <dd>Also, the <code title="attr-command-title"><a href="#attr-command-title">title</a></code> attribute has special semantics on this element.</dd>
3007: <dt>DOM interface:</dt>
3008: <dd>
3009: <pre class="idl">interface <dfn id="htmlcommandelement">HTMLCommandElement</dfn> : <a href="dom.html#htmlelement">HTMLElement</a> {
3010: attribute DOMString <a href="#dom-command-type" title="dom-command-type">type</a>;
3011: attribute DOMString <a href="#dom-command-label" title="dom-command-label">label</a>;
3012: attribute DOMString <a href="#dom-command-icon" title="dom-command-icon">icon</a>;
3013: attribute boolean <a href="#dom-command-disabled" title="dom-command-disabled">disabled</a>;
3014: attribute boolean <a href="#dom-command-checked" title="dom-command-checked">checked</a>;
3015: attribute DOMString <a href="#dom-command-radiogroup" title="dom-command-radiogroup">radiogroup</a>;<!--
3016: attribute boolean <span title="dom-command-default">default</span>;-->
3017: };</pre>
3018: </dd>
3019: </dl><p>The <code><a href="#the-command">command</a></code> element represents a command that the user
1.117 mike 3020: can invoke.</p><p>The <dfn id="attr-command-type" title="attr-command-type"><code>type</code></dfn>
1.1 mike 3021: attribute indicates the kind of command: either a normal command
3022: with an associated action, or a state or option that can be toggled,
1.117 mike 3023: or a selection of one item from a list of items.</p><p>The attribute is an <a href="infrastructure.html#enumerated-attribute">enumerated attribute</a> with three
1.289 mike 3024: keywords and states. The "<dfn id="attr-command-type-keyword-command" title="attr-command-type-keyword-command"><code>command</code></dfn>"
3025: keyword maps to the <a href="#attr-command-type-state-command" title="attr-command-type-state-command">Command</a> state, the
1.520 mike 3026: "<dfn id="attr-command-type-keyword-checkbox" title="attr-command-type-keyword-checkbox"><code>checkbox</code></dfn>"
1.289 mike 3027: keyword maps to the <a href="#attr-command-type-state-checkbox" title="attr-command-type-state-checkbox">Checkbox</a> state, and
3028: the "<dfn id="attr-command-type-keyword-radio" title="attr-command-type-keyword-radio"><code>radio</code></dfn>"
1.1 mike 3029: keyword maps to the <a href="#attr-command-type-state-radio" title="attr-command-type-state-radio">Radio</a> state. The
1.117 mike 3030: <i>missing value default</i> is the <a href="#attr-command-type-state-command" title="attr-command-type-state-command">Command</a> state.</p><dl><dt>The <dfn id="attr-command-type-state-command" title="attr-command-type-state-command">Command</dfn> state</dt>
1.1 mike 3031:
3032: <dd><p>The element <a href="the-xhtml-syntax.html#represents">represents</a> a normal command with an associated action.</p></dd>
3033:
3034: <dt>The <dfn id="attr-command-type-state-checkbox" title="attr-command-type-state-checkbox">Checkbox</dfn> state</dt>
3035:
3036: <dd><p>The element <a href="the-xhtml-syntax.html#represents">represents</a> a state or option that can be toggled.</p></dd>
3037:
3038: <dt>The <dfn id="attr-command-type-state-radio" title="attr-command-type-state-radio">Radio</dfn> state</dt>
3039:
3040: <dd><p>The element <a href="the-xhtml-syntax.html#represents">represents</a> a selection of one item from a list of items.</p></dd>
3041:
3042: </dl><p>The <dfn id="attr-command-label" title="attr-command-label"><code>label</code></dfn>
1.718 mike 3043: attribute gives the name of the command, as shown to the user. The
3044: <code title="attr-command-label"><a href="#attr-command-label">label</a></code> attribute must be
3045: specified and must have a value that is not the empty string.</p><p>The <dfn id="attr-command-title" title="attr-command-title"><code>title</code></dfn>
1.1 mike 3046: attribute gives a hint describing the command, which might be shown
1.117 mike 3047: to the user to help him.</p><p>The <dfn id="attr-command-icon" title="attr-command-icon"><code>icon</code></dfn>
1.1 mike 3048: attribute gives a picture that represents the command. If the
3049: attribute is specified, the attribute's value must contain a
3050: <a href="infrastructure.html#valid-url">valid URL</a>. <span class="impl">To obtain the
3051: <a href="infrastructure.html#absolute-url">absolute URL</a> of the icon, the attribute's value must be
3052: <a href="infrastructure.html#resolve-a-url" title="resolve a url">resolved</a> relative to the
1.117 mike 3053: element.</span></p><!-- this is affected by the base URL being
1.1 mike 3054: changed, so users of this should cache the image once they've
1.117 mike 3055: fetched it once, at least until the relative url changes again --><p>The <dfn id="attr-command-disabled" title="attr-command-disabled"><code>disabled</code></dfn> attribute
1.1 mike 3056: is a <a href="infrastructure.html#boolean-attribute">boolean attribute</a> that, if present, indicates that
1.117 mike 3057: the command is not available in the current state.</p><p class="note">The distinction between <code title="attr-command-disabled"><a href="#attr-command-disabled">disabled</a></code> and <code title="attr-hidden"><a href="editing.html#the-hidden-attribute">hidden</a></code> is subtle. A command would be
1.1 mike 3058: disabled if, in the same context, it could be enabled if only
3059: certain aspects of the situation were changed. A command would be
3060: marked as hidden if, in that situation, the command will never be
3061: enabled. For example, in the context menu for a water faucet, the
3062: command "open" might be disabled if the faucet is already open, but
3063: the command "eat" would be marked hidden since the faucet could
1.117 mike 3064: never be eaten.</p><p>The <dfn id="attr-command-checked" title="attr-command-checked"><code>checked</code></dfn>
1.1 mike 3065: attribute is a <a href="infrastructure.html#boolean-attribute">boolean attribute</a> that, if present,
3066: indicates that the command is selected. The attribute must be
3067: omitted unless the <code title="attr-command-type"><a href="#attr-command-type">type</a></code>
3068: attribute is in either the <a href="#attr-command-type-state-checkbox" title="attr-command-type-state-checkbox">Checkbox</a> state or
3069: the <a href="#attr-command-type-state-radio" title="attr-command-type-state-radio">Radio</a>
1.117 mike 3070: state.</p><p>The <dfn id="attr-command-radiogroup" title="attr-command-radiogroup"><code>radiogroup</code></dfn>
1.1 mike 3071: attribute gives the name of the group of commands that will be
3072: toggled when the command itself is toggled, for commands whose <code title="attr-command-type"><a href="#attr-command-type">type</a></code> attribute has the value "<code title="">radio</code>". The scope of the name is the child list of
1.117 mike 3073: the parent element. The attribute must be omitted unless the <code title="attr-command-type"><a href="#attr-command-type">type</a></code> attribute is in the <a href="#attr-command-type-state-radio" title="attr-command-type-state-radio">Radio</a> state.</p><!--
1.1 mike 3074: <p>If the <code>command</code> element is used when <span
3075: title="menu generation">generating</span> a <span>context
3076: menu</span>, then the <dfn
3077: title="attr-command-default"><code>default</code></dfn> attribute
3078: indicates, if present, that the command is the one that would have
3079: been invoked if the user had directly activated the menu's subject
3080: instead of using its context menu. The <code
3081: title="attr-command-default">default</code> attribute is a
3082: <span>boolean attribute</span>. The attribute must be omitted unless
3083: the <code title="attr-command-type">type</code> attribute is in the
3084: <span title="attr-command-type-state-command">Command</span>
3085: state.</p>
3086:
3087: <div class="example">
3088:
3089: ...an example that shows an element that, if double-clicked,
3090: invokes an action, but that also has a context menu, showing the
3091: various <code>command</code> attributes off, and that has a default
3092: command...
3093:
3094: </div>
1.117 mike 3095: --><div class="impl">
1.1 mike 3096:
3097: <p>The <dfn id="dom-command-type" title="dom-command-type"><code>type</code></dfn>, <dfn id="dom-command-label" title="dom-command-label"><code>label</code></dfn>, <dfn id="dom-command-icon" title="dom-command-icon"><code>icon</code></dfn>, <dfn id="dom-command-disabled" title="dom-command-disabled"><code>disabled</code></dfn>, <dfn id="dom-command-checked" title="dom-command-checked"><code>checked</code></dfn>, and <dfn id="dom-command-radiogroup" title="dom-command-radiogroup"><code>radiogroup</code></dfn><!--,
3098: and <dfn title="dom-command-default"><code>default</code></dfn>-->
1.186 mike 3099: IDL attributes must <a href="infrastructure.html#reflect">reflect</a> the respective content
1.1 mike 3100: attributes of the same name.</p>
3101:
1.153 mike 3102: <p>The element's <a href="embedded-content-0.html#activation-behavior">activation behavior</a> depends on the
1.1 mike 3103: value of the <code title="attr-command-type"><a href="#attr-command-type">type</a></code> attribute
3104: of the element, as follows:</p>
3105:
3106: <dl class="switch"><dt>If the <code title="attr-command-type"><a href="#attr-command-type">type</a></code> attribute is
3107: in the <a href="#attr-command-type-state-checkbox" title="attr-command-type-state-checkbox">Checkbox</a> state</dt>
3108:
3109: <dd><p>If the element has a <code title="attr-command-checked"><a href="#attr-command-checked">checked</a></code> attribute, the UA must
3110: remove that attribute. Otherwise, the UA must add a <code title="attr-command-checked"><a href="#attr-command-checked">checked</a></code> attribute, with the
3111: literal value <code title="">checked</code>. The UA must then
1.788 mike 3112: <a href="webappapis.html#fire-a-click-event">fire a <code title="event-click">click</code> event</a> at the
1.1 mike 3113: element.</p></dd>
3114:
3115:
3116: <dt>If the <code title="attr-command-type"><a href="#attr-command-type">type</a></code> attribute is
3117: in the <a href="#attr-command-type-state-radio" title="attr-command-type-state-radio">Radio</a> state</dt>
3118:
3119: <dd><p>If the element has a parent, then the UA must walk the list
3120: of child nodes of that parent element, and for each node that is a
3121: <code><a href="#the-command">command</a></code> element, if that element has a <code title="attr-command-radiogroup"><a href="#attr-command-radiogroup">radiogroup</a></code> attribute whose
3122: value exactly matches the current element's (treating missing <code title="attr-command-radiogroup"><a href="#attr-command-radiogroup">radiogroup</a></code> attributes as if
3123: they were the empty string), and has a <code title="attr-command-checked"><a href="#attr-command-checked">checked</a></code> attribute, must remove
3124: that attribute.</p>
3125:
3126: <p>Then, the element's <code title="attr-command-checked"><a href="#attr-command-checked">checked</a></code> attribute attribute
3127: must be set to the literal value <code title="">checked</code> and
1.788 mike 3128: the user agent must <a href="webappapis.html#fire-a-click-event">fire a <code title="event-click">click</code>
1.1 mike 3129: event</a> at the element.</p></dd>
3130:
3131:
3132: <dt>Otherwise</dt>
3133:
1.153 mike 3134: <dd><p>The element has no <a href="embedded-content-0.html#activation-behavior">activation behavior</a>.</p></dd>
1.1 mike 3135:
3136: </dl><p class="note">Firing a synthetic <code title="event-click">click</code> event at the element does not cause
3137: any of the actions described above to happen.</p>
3138:
3139: <!-- v2COMMAND: the command="" attribute to make a <command> element
3140: reflect the state of another command, so that the script can update
3141: one place in the page and have context menus, toolbars, shortcuts,
3142: etc, automatically update. Once we add this, expose the Triggers
3143: facet again. -->
3144:
1.117 mike 3145: </div><p class="note"><code><a href="#the-command">command</a></code> elements are not rendered
1.520 mike 3146: unless they <a href="#menus" title="menu">form part of a menu</a>.</p><div class="example">
3147:
3148: <p>Here is an example of a toolbar with three buttons that let the
3149: user toggle between left, center, and right alignment. One could
3150: imagine such a toolbar as part of a text editor. The toolbar also
3151: has a separator followed by another button labeled "Publish",
3152: though that button is disabled.</p>
3153:
3154: <pre><menu type="toolbar">
3155: <command type="radio" radiogroup="alignment" checked="checked"
3156: label="Left" icon="icons/alL.png" onclick="setAlign('left')">
3157: <command type="radio" radiogroup="alignment"
3158: label="Center" icon="icons/alC.png" onclick="setAlign('center')">
3159: <command type="radio" radiogroup="alignment"
3160: label="Right" icon="icons/alR.png" onclick="setAlign('right')">
3161: <hr>
3162: <command type="command" disabled
3163: label="Publish" icon="icons/pub.png" onclick="publish()">
3164: </menu></pre>
3165:
1.729 mike 3166: </div><h4 id="menus"><span class="secno">4.11.4 </span>The <dfn><code>menu</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><dl class="element"><dt>Categories</dt>
1.153 mike 3167: <dd><a href="dom.html#flow-content">Flow content</a>.</dd>
1.385 mike 3168: <dd>If the element's <code title="attr-menu-type"><a href="#attr-menu-type">type</a></code> attribute is in the <a href="#toolbar-state" title="toolbar state">toolbar</a> state: <a href="embedded-content-0.html#interactive-content">Interactive content</a>.</dd>
1.1 mike 3169: <dt>Contexts in which this element may be used:</dt>
1.153 mike 3170: <dd>Where <a href="dom.html#flow-content">flow content</a> is expected.</dd>
1.1 mike 3171: <dt>Content model:</dt>
3172: <dd>Either: Zero or more <code><a href="semantics.html#the-li-element">li</a></code> elements.</dd>
1.153 mike 3173: <dd>Or: <a href="dom.html#flow-content">Flow content</a>.</dd>
1.1 mike 3174: <dt>Content attributes:</dt>
3175: <dd><a href="dom.html#global-attributes">Global attributes</a></dd>
3176: <dd><code title="attr-menu-type"><a href="#attr-menu-type">type</a></code></dd>
3177: <dd><code title="attr-menu-label"><a href="#attr-menu-label">label</a></code></dd>
3178: <dt>DOM interface:</dt>
3179: <dd>
3180: <pre class="idl">interface <dfn id="htmlmenuelement">HTMLMenuElement</dfn> : <a href="dom.html#htmlelement">HTMLElement</a> {
3181: attribute DOMString <a href="#dom-menu-type" title="dom-menu-type">type</a>;
3182: attribute DOMString <a href="#dom-menu-label" title="dom-menu-label">label</a>;
3183: };</pre>
1.117 mike 3184: </dd></dl><p>The <code><a href="#menus">menu</a></code> element represents a list of commands.</p><!-- v2 idea: <menu> should get an icon, like <command> --><p>The <dfn id="attr-menu-type" title="attr-menu-type"><code>type</code></dfn> attribute
1.1 mike 3185: is an <a href="infrastructure.html#enumerated-attribute">enumerated attribute</a> indicating the kind of menu
3186: being declared. The attribute has three states. The <code title="attr-menu-type-context">context</code> keyword maps to the
3187: <dfn id="context-menu-state" title="context menu state">context menu</dfn> state, in which
3188: the element is declaring a context menu. The <code title="attr-menu-type-toolbar">toolbar</code> keyword maps to the
1.385 mike 3189: <dfn id="toolbar-state" title="toolbar state">toolbar</dfn> state, in which the
3190: element is declaring a toolbar. The attribute may also be
1.1 mike 3191: omitted. The <i>missing value default</i> is the <dfn id="list-state" title="list
3192: state">list</dfn> state, which indicates that the element is merely
3193: a list of commands that is neither declaring a context menu nor
1.385 mike 3194: defining a toolbar.</p><p>If a <code><a href="#menus">menu</a></code> element's <code title="attr-menu-type"><a href="#attr-menu-type">type</a></code> attribute is in the <a href="#context-menu-state" title="context menu state">context menu</a> state, then the
1.1 mike 3195: element <a href="the-xhtml-syntax.html#represents">represents</a> the commands of a context menu, and
3196: the user can only interact with the commands if that context menu is
1.385 mike 3197: activated.</p><p>If a <code><a href="#menus">menu</a></code> element's <code title="attr-menu-type"><a href="#attr-menu-type">type</a></code> attribute is in the <a href="#toolbar-state" title="toolbar state">toolbar</a> state, then the element
1.1 mike 3198: <a href="the-xhtml-syntax.html#represents">represents</a> a list of active commands that the user can
1.117 mike 3199: immediately interact with.</p><p>If a <code><a href="#menus">menu</a></code> element's <code title="attr-menu-type"><a href="#attr-menu-type">type</a></code> attribute is in the <a href="#list-state" title="list state">list</a> state, then the element either
1.1 mike 3200: <a href="the-xhtml-syntax.html#represents">represents</a> an unordered list of items (each represented
3201: by an <code><a href="semantics.html#the-li-element">li</a></code> element), each of which represents a command
3202: that the user can perform or activate, or, if the element has no
1.153 mike 3203: <code><a href="semantics.html#the-li-element">li</a></code> element children, <a href="dom.html#flow-content">flow content</a>
1.117 mike 3204: describing available commands.</p><p>The <dfn id="attr-menu-label" title="attr-menu-label"><code>label</code></dfn>
1.1 mike 3205: attribute gives the label of the menu. It is used by user agents to
3206: display nested menus in the UI. For example, a context menu
3207: containing another menu would use the nested menu's <code title="attr-menu-label"><a href="#attr-menu-label">label</a></code> attribute for the submenu's
1.117 mike 3208: menu label.</p><div class="impl">
1.1 mike 3209:
1.186 mike 3210: <p>The <dfn id="dom-menu-type" title="dom-menu-type"><code>type</code></dfn> and <dfn id="dom-menu-label" title="dom-menu-label"><code>label</code></dfn> IDL attributes must
1.1 mike 3211: <a href="infrastructure.html#reflect">reflect</a> the respective content attributes of the same
3212: name.</p>
3213:
1.729 mike 3214: </div><h5 id="menus-intro"><span class="secno">4.11.4.1 </span>Introduction</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p><i>This section is non-normative.</i></p><p>The <code><a href="#menus">menu</a></code> element is used to define context menus and
1.385 mike 3215: toolbars.</p><p>For example, the following represents a toolbar with three menu
1.148 mike 3216: buttons on it, each of which has a dropdown menu with a series of
3217: options:</p><pre><menu type="toolbar">
1.1 mike 3218: <li>
3219: <menu label="File">
3220: <button type="button" onclick="fnew()">New...</button>
3221: <button type="button" onclick="fopen()">Open...</button>
1.290 mike 3222: <button type="button" onclick="fsave()">Save</button>
1.1 mike 3223: <button type="button" onclick="fsaveas()">Save as...</button>
3224: </menu>
3225: </li>
3226: <li>
3227: <menu label="Edit">
3228: <button type="button" onclick="ecopy()">Copy</button>
3229: <button type="button" onclick="ecut()">Cut</button>
3230: <button type="button" onclick="epaste()">Paste</button>
3231: </menu>
3232: </li>
3233: <li>
3234: <menu label="Help">
3235: <li><a href="help.html">Help</a></li>
3236: <li><a href="about.html">About</a></li>
3237: </menu>
3238: </li>
1.718 mike 3239: </menu></pre><p>In a supporting user agent, this might look like this:</p><p><img alt="A toolbar with three buttons, labeled 'File', 'Edit', and 'Help'; where if you select the 'Edit' button you get a drop-down menu with three more options, 'Copy', 'Cut', and 'Paste'." src="http://dev.w3.org/html5/spec/images/sample-toolbar-1.png"></p><p>In a legacy user agent, the above would look like a bulleted list
1.148 mike 3240: with three items, the first of which has four buttons, the second of
3241: which has three, and the third of which has two nested bullet points
3242: with two items consisting of links.</p><hr><p>The following implements a similar toolbar, with a single button
3243: whose values, when selected, redirect the user to Web sites.</p><pre><form action="redirect.cgi">
3244: <menu type="toolbar">
1.1 mike 3245: <label for="goto">Go to...</label>
3246: <menu label="Go">
1.746 mike 3247: <select id="goto"<!--
1.1 mike 3248: onchange="if (this.options[this.selectedIndex].value)
1.746 mike 3249: window.location = this.options[this.selectedIndex].value"-->>
1.1 mike 3250: <option value="" selected="selected"> Select site: </option>
3251: <option value="http://www.apple.com/"> Apple </option>
3252: <option value="http://www.mozilla.org/"> Mozilla </option>
3253: <option value="http://www.opera.com/"> Opera </option>
3254: </select>
3255: <span><input type="submit" value="Go"></span>
3256: </menu>
3257: </menu>
1.148 mike 3258: </form></pre><p>The behavior in supporting user agents is similar to the example
3259: above, but here the legacy behaviour consists of a single
3260: <code><a href="forms.html#the-select-element">select</a></code> element with a submit button. The submit button
3261: doesn't appear in the toolbar, because it is not a direct child of
3262: the <code><a href="#menus">menu</a></code> element or of its <code><a href="semantics.html#the-li-element">li</a></code>
3263: children.</p><div class="impl">
1.1 mike 3264:
1.729 mike 3265: <h5 id="building-menus-and-toolbars"><span class="secno">4.11.4.2 </span><dfn>Building menus and toolbars</dfn></h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
1.1 mike 3266:
1.385 mike 3267: <p>A menu (or toolbar) consists of a list of zero or more of the
1.1 mike 3268: following components:</p>
3269:
3270: <ul class="brief"><li><a href="#concept-command" title="concept-command">Commands</a>, which can be marked as default commands</li>
3271: <li>Separators</li>
3272: <li>Other menus (which allows the list to be nested)</li>
3273: </ul><p>The list corresponding to a particular <code><a href="#menus">menu</a></code> element
3274: is built by iterating over its child nodes. For each child node in
3275: <a href="infrastructure.html#tree-order">tree order</a>, the required behavior depends on what the
3276: node is, as follows:</p>
3277:
3278: <dl class="switch"><dt>An element that <a href="#concept-command" title="concept-command">defines a command</a></dt>
3279:
3280: <dd>Append the command to the menu, respecting its <a href="#concept-facet" title="concept-facet">facets</a><!-- we might need to be
3281: explicit about what this means for each facet, if testing shows
3282: this isn't well-implemented. e.g.: If there's an Icon facet for the
1.408 mike 3283: command, it should be <span title="fetch">fetched</span> (this
3284: would be http-origin privacy-sensitive), and then that image should
3285: be associated with the command, such that each command only has its
3286: image fetched once, to prevent changes to the base URL from having
3287: effects after the image has been fetched once. (no need to resolve
3288: the Icon facet, it's an absolute URL) -->. <!--If the element is a
3289: <code>command</code> element with a <code
3290: title="attr-command-default">default</code> attribute, mark the
3291: command as being a default command.--></dd>
1.1 mike 3292:
3293:
3294: <dt>An <code><a href="semantics.html#the-hr-element">hr</a></code> element</dt>
3295: <dt>An <code><a href="forms.html#the-option-element">option</a></code> element that has a <code title="attr-option-value"><a href="forms.html#attr-option-value">value</a></code> attribute set to the empty
3296: string, and has a <code title="attr-option-disabled"><a href="forms.html#attr-option-disabled">disabled</a></code> attribute, and whose
1.804 mike 3297: <code><a href="infrastructure.html#textcontent">textContent</a></code> consists of a string of one or more
1.1 mike 3298: hyphens (U+002D HYPHEN-MINUS)</dt>
3299:
3300: <dd>Append a separator to the menu.</dd>
3301:
3302:
3303: <dt>An <code><a href="semantics.html#the-li-element">li</a></code> element</dt>
3304: <dt>A <code><a href="forms.html#the-label-element">label</a></code> element</dt>
3305:
3306: <dd>Iterate over the children of the element.</dd>
3307:
3308:
3309: <dt>A <code><a href="#menus">menu</a></code> element with no <code title="attr-menu-label"><a href="#attr-menu-label">label</a></code> attribute</dt>
3310: <dt>A <code><a href="forms.html#the-select-element">select</a></code> element</dt>
3311:
3312: <dd>Append a separator to the menu, then iterate over the children
3313: of the <code><a href="#menus">menu</a></code> or <code><a href="forms.html#the-select-element">select</a></code> element, then
3314: append another separator.</dd>
3315:
3316: <!-- v2: we might want to support <select> in <label> as giving a named submenu -->
3317:
3318:
3319: <dt>A <code><a href="#menus">menu</a></code> element with a <code title="attr-menu-label"><a href="#attr-menu-label">label</a></code> attribute</dt>
3320: <dt>An <code><a href="forms.html#the-optgroup-element">optgroup</a></code> element with a <code title="attr-menu-label"><a href="#attr-menu-label">label</a></code> attribute</dt>
3321:
3322: <dd>Append a submenu to the menu, using the value of the element's
3323: <code title="">label</code> attribute as the label of the menu. The
3324: submenu must be constructed by taking the element and creating a
3325: new menu for it using the complete process described in this
3326: section.</dd>
3327:
3328:
3329: <dt>Any other node</dt>
3330:
3331: <dd><a href="infrastructure.html#ignore">Ignore</a> the node.</dd>
3332:
3333: </dl><p>Once all the nodes have been processed as described above, the
3334: user agent must the post-process the menu as follows:</p>
3335:
1.521 mike 3336: <ol><li>Except for separators, any menu item with no label, or whose
3337: label is the empty string, must be removed.</li>
1.1 mike 3338:
1.521 mike 3339: <li>Any sequence of two or more separators in a row must be
3340: collapsed to a single separator.</li>
1.1 mike 3341:
1.521 mike 3342: <li>Any separator at the start or end of the menu must be
3343: removed.</li>
1.1 mike 3344:
1.729 mike 3345: </ol></div><h5 id="context-menus"><span class="secno">4.11.4.3 </span><dfn>Context menus</dfn></h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <dfn id="attr-contextmenu" title="attr-contextmenu"><code>contextmenu</code></dfn>
1.1 mike 3346: attribute gives the element's <a href="#context-menus" title="context menus">context
3347: menu</a>. The value must be the ID of a <code><a href="#menus">menu</a></code> element
3348: in the DOM. <span class="impl">If the node that would be obtained by
3349: the invoking the <code>getElementById()</code> method using the
3350: attribute's value as the only argument is null or not a
3351: <code><a href="#menus">menu</a></code> element, then the element has no assigned context
3352: menu. Otherwise, the element's assigned context menu is the element
1.117 mike 3353: so identified.</span></p><div class="impl">
1.1 mike 3354:
3355: <p>When an element's context menu is requested (e.g. by the user
3356: right-clicking the element, or pressing a context menu key), the UA
1.788 mike 3357: must <a href="webappapis.html#fire-a-simple-event">fire a simple event</a> named <code title="event-contextmenu">contextmenu</code> that bubbles and is
1.1 mike 3358: cancelable at the element for which the menu was requested.</p>
3359:
3360: <p class="note">Typically, therefore, the firing of the <code title="event-contextmenu">contextmenu</code> event will be the
3361: default action of a <code title="mouseup">mouseup</code> or <code title="event-keyup">keyup</code> event. The exact sequence of events
3362: is UA-dependent, as it will vary based on platform conventions.</p>
3363:
3364: <p>The default action of the <code title="event-contextmenu">contextmenu</code> event depends on
3365: whether the element or one of its ancestors has a context menu
3366: assigned (using the <code title="attr-contextmenu"><a href="#attr-contextmenu">contextmenu</a></code> attribute) or not. If
3367: there is no context menu assigned, the default action must be for
3368: the user agent to show its default context menu, if it has one.</p>
3369:
3370: <p>If the element or one of its ancestors <em>does</em> have a
1.788 mike 3371: context menu assigned, then the user agent must <a href="webappapis.html#fire-a-simple-event">fire a simple
1.454 mike 3372: event</a> named <code title="event-show">show</code> at the
1.1 mike 3373: <code><a href="#menus">menu</a></code> element of the context menu of the nearest
3374: ancestor (including the element itself) with one assigned.</p>
3375: <!-- v2: include modifier key information -->
3376:
3377: <p>The default action of <em>this</em> event is that the user agent
1.385 mike 3378: must show a context menu <a href="#building-menus-and-toolbars" title="building menus and
3379: toolbars">built</a> from the <code><a href="#menus">menu</a></code> element.</p>
1.1 mike 3380:
3381: <p>The user agent may also provide access to its default context
3382: menu, if any, with the context menu shown. For example, it could
3383: merge the menu items from the two menus together, or provide the
3384: page's context menu as a submenu of the default menu.</p>
3385:
3386: <p>If the user dismisses the menu without making a selection,
3387: nothing in particular happens.</p>
3388:
1.402 mike 3389: <p>If the user selects a menu item that represents a <a href="#concept-command" title="concept-command">command</a>, then the UA must invoke
1.1 mike 3390: that command's <a href="#command-facet-action" title="command-facet-Action">Action</a>.</p>
3391:
3392: <p>Context menus must not, while being shown, reflect changes in the
1.521 mike 3393: DOM; they are constructed as the default action of the <code title="event-show">show</code> event and must remain as constructed
3394: until dismissed.</p>
1.1 mike 3395:
3396: <p>User agents may provide means for bypassing the context menu
3397: processing model, ensuring that the user can always access the UA's
3398: default context menus. For example, the user agent could handle
3399: right-clicks that have the Shift key depressed in such a way that it
3400: does not fire the <code title="event-contextmenu">contextmenu</code>
3401: event and instead always shows the default context menu.</p>
3402:
3403: <p>The <dfn id="dom-contextmenu" title="dom-contextMenu"><code>contextMenu</code></dfn>
3404: attribute must <a href="infrastructure.html#reflect">reflect</a> the <code title="attr-contextmenu"><a href="#attr-contextmenu">contextmenu</a></code> content attribute.</p>
3405:
1.520 mike 3406: </div><div class="example">
3407:
3408: <p>Here is an example of a context menu for an input control:</p>
3409:
3410: <pre><form name="npc">
3411: <label>Character name: <input name=char type=text contextmenu=namemenu required></label>
3412: <menu type=context id=namemenu>
3413: <command label="Pick random name" onclick="document.forms.npc.elements.char.value = getRandomName()">
3414: <command label="Prefill other fields based on name" onclick="prefillFields(document.forms.npc.elements.char.value)">
3415: </menu>
3416: </form></pre>
3417:
3418: <p>This adds to items to the control's context menu, one called
3419: "Pick random name", and one called "Prefill other fields based on
3420: name". They invoke scripts that are not shown in the example
3421: above.</p>
3422:
1.117 mike 3423: </div><div class="impl">
1.1 mike 3424:
1.729 mike 3425: <h5 id="toolbars"><span class="secno">4.11.4.4 </span><dfn>Toolbars</dfn></h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
1.1 mike 3426:
1.385 mike 3427: <p>When a <code><a href="#menus">menu</a></code> element has a <code title="attr-menu-type"><a href="#attr-menu-type">type</a></code> attribute in the <a href="#toolbar-state" title="toolbar state">toolbar</a> state, then the user agent
3428: must <a href="#building-menus-and-toolbars" title="building menus and toolbars">build</a> the
1.1 mike 3429: menu for that <code><a href="#menus">menu</a></code> element, and use the result in the
3430: rendering.</p>
3431:
3432: <p>The user agent must reflect changes made to the
1.385 mike 3433: <code><a href="#menus">menu</a></code>'s DOM, by immediately <a href="#building-menus-and-toolbars" title="building menus
3434: and toolbars">rebuilding</a> the menu.</p>
1.1 mike 3435:
1.729 mike 3436: </div><h4 id="commands"><span class="secno">4.11.5 </span>Commands</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>A <dfn id="concept-command" title="concept-command">command</dfn> is the abstraction
1.51 mike 3437: behind menu items, buttons, and links.<!--v2COMMAND: Once a command
3438: is defined, other parts of the interface can refer to the same
3439: command, allowing many access points to a single feature to share
1.117 mike 3440: aspects such as the disabled state.--></p><p id="facets">Commands are defined to have the following
3441: <dfn id="concept-facet" title="concept-facet">facets</dfn>:</p><dl><dt><dfn id="command-facet-type" title="command-facet-Type">Type</dfn></dt>
1.1 mike 3442:
3443: <dd>The kind of command: "command", meaning it is a normal command;
3444: "radio", meaning that triggering the command will, amongst other
3445: things, set the <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked
3446: State</a> to true (and probably uncheck some other commands); or
3447: "checkbox", meaning that triggering the command will, amongst other
3448: things, toggle the value of the <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a>.</dd>
3449:
3450: <dt><dfn id="command-facet-id" title="command-facet-ID">ID</dfn></dt>
3451:
3452: <dd>The name of the command, for referring to the command from the
3453: markup or from script. If a command has no ID, it is an
3454: <dfn id="anonymous-command">anonymous command</dfn>.</dd>
3455:
3456: <dt><dfn id="command-facet-label" title="command-facet-Label">Label</dfn></dt>
3457:
3458: <dd>The name of the command as seen by the user.</dd>
3459:
3460: <dt><dfn id="command-facet-hint" title="command-facet-Hint">Hint</dfn></dt>
3461:
3462: <dd>A helpful or descriptive string that can be shown to the
3463: user.</dd>
3464:
3465: <dt><dfn id="command-facet-icon" title="command-facet-Icon">Icon</dfn></dt>
3466:
3467: <dd>An <a href="infrastructure.html#absolute-url">absolute URL</a> identifying a graphical image that
3468: represents the action. A command might not have an Icon.</dd> <!--
3469: changing base URLs might change the icon -->
3470:
3471: <dt><dfn id="command-facet-accesskey" title="command-facet-AccessKey">Access Key</dfn></dt>
3472:
3473: <dd>A key combination selected by the user agent that triggers the
3474: command. A command might not have an Access Key.</dd>
3475:
3476: <dt><dfn id="command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</dfn></dt>
3477:
3478: <dd>Whether the command is hidden or not (basically, whether it
3479: should be shown in menus).</dd>
3480:
3481: <dt><dfn id="command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</dfn></dt>
3482:
3483: <dd>Whether the command is relevant and can be triggered or not.</dd>
3484:
3485: <dt><dfn id="command-facet-checkedstate" title="command-facet-CheckedState">Checked State</dfn></dt>
3486:
3487: <dd>Whether the command is checked or not.</dd>
3488:
3489: <dt><dfn id="command-facet-action" title="command-facet-Action">Action</dfn></dt>
3490:
3491: <dd>The actual effect that triggering the command will have. This
3492: could be a scripted event handler, a <a href="infrastructure.html#url">URL</a> to which to
3493: <a href="history.html#navigate">navigate</a>, or a form submission.</dd>
3494:
3495: <!-- v2COMMAND
3496: <dt><dfn title="command-facet-Triggers">Triggers</dfn></dt>
3497:
3498: <dd>The list of elements that can trigger the command. The element
3499: defining a command is always in the list of elements that can
3500: trigger the command. For anonymous commands, only the element
3501: defining the command is on the list, since other elements have no
3502: way to refer to it.</dd>
3503: -->
3504:
3505: </dl><p>These facets are exposed on elements using the <dfn id="command-api">command
1.117 mike 3506: API</dfn>:</p><dl class="domintro"><dt><var title="">element</var> . <code title="dom-command-ro-commandType"><a href="#dom-command-ro-commandtype">commandType</a></code></dt>
1.1 mike 3507:
3508: <dd>
3509:
3510: <p>Exposes the <a href="#command-facet-type" title="command-facet-Type">Type</a> facet of the command.</p>
3511:
3512: </dd>
3513:
3514: <dt><var title="">element</var> . <code title="dom-id"><a href="dom.html#dom-id">id</a></code></dt>
3515:
3516: <dd>
3517:
3518: <p>Exposes the <a href="#command-facet-id" title="command-facet-ID">ID</a> facet of the command.</p>
3519:
3520: </dd>
3521:
3522: <dt><var title="">element</var> . <code title="dom-command-ro-label"><a href="#dom-command-ro-label">label</a></code></dt>
3523:
3524: <dd>
3525:
3526: <p>Exposes the <a href="#command-facet-label" title="command-facet-Label">Label</a> facet of the command.</p>
3527:
3528: </dd>
3529:
3530: <dt><var title="">element</var> . <code title="dom-title"><a href="dom.html#dom-title">title</a></code></dt>
3531:
3532: <dd>
3533:
3534: <p>Exposes the <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> facet of the command.</p>
3535:
3536: </dd>
3537:
3538: <dt><var title="">element</var> . <code title="dom-command-ro-icon"><a href="#dom-command-ro-icon">icon</a></code></dt>
3539:
3540: <dd>
3541:
3542: <p>Exposes the <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> facet of the command.</p>
3543:
3544: </dd>
3545:
3546: <dt><var title="">element</var> . <code title="dom-accessKeyLabel"><a href="editing.html#dom-accesskeylabel">accessKeyLabel</a></code></dt>
3547:
3548: <dd>
3549:
3550: <p>Exposes the <a href="#command-facet-accesskey" title="command-facet-AccessKey">Access Key</a> facet of the command.</p>
3551:
3552: </dd>
3553:
3554: <dt><var title="">element</var> . <code title="dom-hidden"><a href="editing.html#dom-hidden">hidden</a></code></dt>
3555:
3556: <dd>
3557:
3558: <p>Exposes the <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a> facet of the command.</p>
3559:
3560: </dd>
3561:
3562: <dt><var title="">element</var> . <code title="dom-command-ro-disabled"><a href="#dom-command-ro-disabled">disabled</a></code></dt>
3563:
3564: <dd>
3565:
3566: <p>Exposes the <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a> facet of the command.</p>
3567:
3568: </dd>
3569:
3570: <dt><var title="">element</var> . <code title="dom-command-ro-checked"><a href="#dom-command-ro-checked">checked</a></code></dt>
3571:
3572: <dd>
3573:
3574: <p>Exposes the <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a> facet of the command.</p>
3575:
3576: </dd>
3577:
3578: <dt><var title="">element</var> . <code title="dom-click"><a href="editing.html#dom-click">click</a></code>()</dt>
3579:
3580: <dd>
3581:
3582: <p>Triggers the <a href="#command-facet-action" title="command-facet-Action">Action</a> of the command.</p>
3583:
3584: </dd>
3585:
3586: <!--v2COMMAND
3587: <dt><var title="">element</var> . <code title="dom-command-ro-triggers">triggers</code></dt>
3588:
3589: <dd>
3590:
3591: <p>Exposes the <span title="command-facet-Triggers">Triggers</span> facet of the command.</p>
3592:
3593: </dd>
3594: -->
3595:
3596: </dl><div class="impl">
3597:
3598: <p>The <dfn id="dom-command-ro-commandtype" title="dom-command-ro-commandType"><code>commandType</code></dfn>
3599: 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="#command-facet-type" title="command-facet-Type">Type</a> of the command defined by the
3600: element is "command", "radio", or "checked" respectively. If the
3601: element does not define a command, it must return null.</p>
3602:
3603: <p>The <dfn id="dom-command-ro-label" title="dom-command-ro-label"><code>label</code></dfn>
3604: attribute must return the command's <a href="#command-facet-label" title="command-facet-Label">Label</a>, or null if the element
3605: does not define a command or does not specify a <a href="#command-facet-label" title="command-facet-Label">Label</a>. This attribute will be
1.186 mike 3606: shadowed by the <code title="">label</code> IDL attribute on
1.1 mike 3607: <code><a href="forms.html#the-option-element">option</a></code> and <code><a href="#the-command">command</a></code> elements.</p>
3608:
3609: <p>The <dfn id="dom-command-ro-icon" title="dom-command-ro-icon"><code>icon</code></dfn>
3610: attribute must return the <a href="infrastructure.html#absolute-url">absolute URL</a> of the command's
3611: <a href="#command-facet-icon" title="command-facet-Icon">Icon</a>. If the element does
3612: not specify an icon, or if the element does not define a command,
3613: then the attribute must return null. This attribute will be shadowed
1.186 mike 3614: by the <code title="dom-command-icon"><a href="#dom-command-icon">icon</a></code> IDL attribute on
1.1 mike 3615: <code><a href="#the-command">command</a></code> elements.</p>
3616:
3617: <p>The <dfn id="dom-command-ro-disabled" title="dom-command-ro-disabled"><code>disabled</code></dfn>
3618: attribute must return true if the command's <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a> is that
3619: the command is disabled, and false if the command is not
3620: disabled. This attribute is not affected by the command's <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a>. If the
3621: element does not define a command, the attribute must return
1.290 mike 3622: false. This attribute will be shadowed by the <code title="">disabled</code> IDL attribute on <code><a href="forms.html#the-button-element">button</a></code>,
1.1 mike 3623: <code><a href="forms.html#the-input-element">input</a></code>, <code><a href="forms.html#the-option-element">option</a></code>, and <code><a href="#the-command">command</a></code>
3624: elements.</p>
3625:
3626: <p>The <dfn id="dom-command-ro-checked" title="dom-command-ro-checked"><code>checked</code></dfn> attribute
3627: must return true if the command's <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a> is that the
3628: command is checked, and false if it is that the command is not
3629: checked. If the element does not define a command, the attribute
1.290 mike 3630: must return false. This attribute will be shadowed by the <code title="">checked</code> IDL attribute on <code><a href="forms.html#the-input-element">input</a></code> and
1.1 mike 3631: <code><a href="#the-command">command</a></code> elements.</p>
3632:
3633: <!--v2COMMAND
3634: <p>The <dfn
3635: title="dom-command-ro-triggers"><code>triggers</code></dfn>
3636: attribute must return a list containing the elements that can
3637: trigger the command (the command's <span
3638: title="command-facet-Triggers">Triggers</span>). The list must be
3639: <span>live</span>. While the element does not define a command, the
3640: list must be empty.</p>
3641: -->
3642:
3643: <p class="note">The <a href="#command-facet-id" title="command-facet-ID">ID</a> facet
1.665 mike 3644: is exposed by the <code title="dom-id"><a href="dom.html#dom-id">id</a></code> IDL attribute,
1.1 mike 3645: the <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> facet is exposed by
1.186 mike 3646: the <code title="dom-title"><a href="dom.html#dom-title">title</a></code> IDL attribute, the <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> facet is exposed by
3647: the <code title="dom-accessKeyLabel"><a href="editing.html#dom-accesskeylabel">accessKeyLabel</a></code> IDL
1.1 mike 3648: attribute, and the <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden
1.186 mike 3649: State</a> facet is exposed by the <code title="dom-hidden"><a href="editing.html#dom-hidden">hidden</a></code> IDL attribute.</p>
1.1 mike 3650:
1.117 mike 3651: </div><hr><dl class="domintro"><dt><var title="">document</var> . <code title="dom-document-commands"><a href="#dom-document-commands">commands</a></code></dt>
1.1 mike 3652: <dd>
1.153 mike 3653: <p>Returns an <code><a href="infrastructure.html#htmlcollection">HTMLCollection</a></code> of the elements in the
1.804 mike 3654: <code><a href="infrastructure.html#document">Document</a></code> that define commands and have IDs.</p>
1.1 mike 3655: </dd>
3656:
3657: </dl><div class="impl">
3658:
3659: <p>The <dfn id="dom-document-commands" title="dom-document-commands"><code>commands</code></dfn> attribute
3660: of the document's <code><a href="dom.html#htmldocument">HTMLDocument</a></code> interface must return an
1.804 mike 3661: <code><a href="infrastructure.html#htmlcollection">HTMLCollection</a></code> rooted at the <code><a href="infrastructure.html#document">Document</a></code>
1.1 mike 3662: node, whose filter matches only elements that <a href="#concept-command" title="concept-command">define commands</a> and have <a href="#command-facet-id" title="command-facet-ID">IDs</a>.</p>
3663:
1.117 mike 3664: </div><hr><p>User agents may expose the <a href="#concept-command" title="concept-command">commands</a> whose <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a> facet is false
1.1 mike 3665: (visible), e.g. in the user agent's menu bar. User agents are
3666: encouraged to do this especially for commands that have <a href="#command-facet-accesskey" title="command-facet-AccessKey">Access Keys</a>, as a way to
1.117 mike 3667: advertise those keys to the user.</p><div class="impl">
1.1 mike 3668:
1.729 mike 3669: <h5 id="using-the-a-element-to-define-a-command"><span class="secno">4.11.5.1 </span><dfn title="a-command">Using the <code>a</code> element to define a command</dfn></h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
1.1 mike 3670:
1.748 mike 3671: <p>An <code><a href="text-level-semantics.html#the-a-element">a</a></code> element with an <code title="attr-hyperlink-href"><a href="#attr-hyperlink-href">href</a></code> attribute <a href="#concept-command" title="concept-command">defines a command</a>.</p>
1.1 mike 3672:
3673: <p>The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command
3674: is "command".</p>
3675:
3676: <p>The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is
3677: the value of the <code title="attr-id"><a href="dom.html#the-id-attribute">id</a></code> attribute of the
3678: element, if the attribute is present and not empty. Otherwise the
3679: command is an <a href="#anonymous-command">anonymous command</a>.</p>
3680:
3681: <p>The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command
1.804 mike 3682: is the string given by the element's <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL
1.1 mike 3683: attribute.</p>
3684:
3685: <p>The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command
3686: is the value of the <code title="attr-title"><a href="dom.html#the-title-attribute">title</a></code> attribute
3687: of the element. If the attribute is not present, the <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> is the empty string.</p>
3688:
3689: <p>The <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> of the command
3690: is the <a href="infrastructure.html#absolute-url">absolute URL</a> obtained from <a href="infrastructure.html#resolve-a-url" title="resolve
1.153 mike 3691: a url">resolving</a> the value of the <code title="attr-img-src"><a href="text-level-semantics.html#attr-img-src">src</a></code> attribute of the first
3692: <code><a href="text-level-semantics.html#the-img-element">img</a></code> element descendant of the element, relative to that
1.1 mike 3693: element, if there is such an element and resolving its attribute is
3694: successful. Otherwise, there is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the command.</p>
3695:
3696: <p>The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the
3697: command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>, if
3698: any.</p>
3699:
3700: <p>The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a>
3701: of the command is true (hidden) if the element has a <code title="attr-hidden"><a href="editing.html#the-hidden-attribute">hidden</a></code> attribute, and false
3702: otherwise.</p>
3703:
3704: <p>The <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled
3705: State</a> facet of the command is always false. (The command is
3706: always enabled.)</p>
3707:
3708: <p>The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a>
3709: of the command is always false. (The command is never checked.)</p>
3710:
3711: <p>The <a href="#command-facet-action" title="command-facet-Action">Action</a> of the
1.788 mike 3712: command is to <a href="webappapis.html#fire-a-click-event" title="fire a click event">fire a <code title="event-click">click</code> event</a> at the element.</p>
1.1 mike 3713:
3714:
1.729 mike 3715: <h5 id="using-the-button-element-to-define-a-command"><span class="secno">4.11.5.2 </span><dfn title="button-command">Using the <code>button</code> element to define a command</dfn></h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
1.1 mike 3716:
3717: <p>A <code><a href="forms.html#the-button-element">button</a></code> element always <a href="#concept-command" title="concept-command">defines a command</a>.</p>
3718:
3719: <p>The <a href="#command-facet-type" title="command-facet-Type">Type</a>, <a href="#command-facet-id" title="command-facet-ID">ID</a>, <a href="#command-facet-label" title="command-facet-Label">Label</a>, <a href="#command-facet-hint" title="command-facet-Hint">Hint</a>, <a href="#command-facet-icon" title="command-facet-Icon">Icon</a>, <a href="#command-facet-accesskey" title="command-facet-AccessKey">Access Key</a>, <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a>, <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a>, and <a href="#command-facet-action" title="command-facet-Action">Action</a> facets of the command are
3720: determined <a href="#using-the-a-element-to-define-a-command" title="a-command">as for <code>a</code>
3721: elements</a> (see the previous section).</p>
3722:
3723: <p>The <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled
3724: State</a> of the command mirrors the <a href="forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a> state of the button.</p>
3725:
3726:
1.729 mike 3727: <h5 id="using-the-input-element-to-define-a-command"><span class="secno">4.11.5.3 </span><dfn title="input-command">Using the <code>input</code> element to define a command</dfn></h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
1.1 mike 3728:
1.39 mike 3729: <p>An <code><a href="forms.html#the-input-element">input</a></code> element whose <code title="attr-input-type"><a href="forms.html#attr-input-type">type</a></code> attribute is in one of the <a href="forms.html#submit-button-state" title="attr-input-type-submit">Submit Button</a>, <a href="forms.html#reset-button-state" title="attr-input-type-reset">Reset Button</a>, <a href="forms.html#image-button-state" title="attr-input-type-image">Image Button</a>, <a href="forms.html#button-state" title="attr-input-type-button">Button</a>, <a href="forms.html#radio-button-state" title="attr-input-type-radio">Radio Button</a>, or <a href="forms.html#checkbox-state" title="attr-input-type-checkbox">Checkbox</a> states <a href="#concept-command" title="concept-command">defines a command</a>.</p>
1.1 mike 3730:
3731: <p>The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command
3732: is "radio" if the <code title="attr-input-type"><a href="forms.html#attr-input-type">type</a></code>
3733: attribute is in the <code title="attr-input-type-radio"><a href="forms.html#radio-button-state">Radio
3734: Button</a></code> state, "checkbox" if the <code title="attr-input-type"><a href="forms.html#attr-input-type">type</a></code> attribute is in the <code title="attr-input-type-checkbox"><a href="forms.html#checkbox-state">Checkbox</a></code> state, and
3735: "command" otherwise.</p>
3736:
3737: <p>The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is
3738: the value of the <code title="attr-id"><a href="dom.html#the-id-attribute">id</a></code> attribute of the
3739: element, if the attribute is present and not empty. Otherwise the
3740: command is an <a href="#anonymous-command">anonymous command</a>.</p>
3741:
3742: <p>The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command
3743: depends on the Type of the command:</p>
3744:
3745: <p>If the <a href="#command-facet-type" title="command-facet-Type">Type</a> is "command",
3746: then it is the string given by the <code title="attr-input-value"><a href="forms.html#attr-input-value">value</a></code> attribute, if any, and a
3747: UA-dependent, locale-dependent value that the UA uses to label the
3748: button itself if the attribute is absent.</p>
3749:
3750: <p>Otherwise, the <a href="#command-facet-type" title="command-facet-Type">Type</a> is
3751: "radio" or "checkbox". If the element is a <a href="forms.html#labeled-control">labeled
1.804 mike 3752: control</a>, the <code><a href="infrastructure.html#textcontent">textContent</a></code> of the first
1.1 mike 3753: <code><a href="forms.html#the-label-element">label</a></code> element in <a href="infrastructure.html#tree-order">tree order</a> whose
3754: <a href="forms.html#labeled-control">labeled control</a> is the element in question is the <a href="#command-facet-label" title="command-facet-Label">Label</a> (in DOM terms, this is the
3755: string given by <code><var title="">element</var>.labels[0].textContent</code>). Otherwise,
3756: the value of the <code title="attr-input-value"><a href="forms.html#attr-input-value">value</a></code>
3757: attribute, if present, is the <a href="#command-facet-label" title="command-facet-Label">Label</a>. Otherwise, the <a href="#command-facet-label" title="command-facet-Label">Label</a> is the empty string.</p>
3758:
3759: <p>The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command
3760: is the value of the <code title="attr-title"><a href="dom.html#the-title-attribute">title</a></code> attribute
3761: of the <code><a href="forms.html#the-input-element">input</a></code> element. If the attribute is not present, the
3762: <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> is the empty
3763: string.</p>
3764:
1.39 mike 3765: <p>If the element's <code title="attr-input-type"><a href="forms.html#attr-input-type">type</a></code>
3766: attribute is in the <a href="forms.html#image-button-state" title="attr-input-type-image">Image
1.153 mike 3767: Button</a> state, and the element has a <code title="attr-img-src"><a href="text-level-semantics.html#attr-img-src">src</a></code> attribute, and that attribute's
1.39 mike 3768: value can be successfully <a href="infrastructure.html#resolve-a-url" title="resolve a
3769: url">resolved</a> relative to the element, then the <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> of the command is the
3770: <a href="infrastructure.html#absolute-url">absolute URL</a> obtained from resolving that attribute
3771: that way. Otherwise, there is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the command.</p>
1.1 mike 3772:
3773: <p>The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the
3774: command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>, if
3775: any.</p>
3776:
3777: <p>The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a>
3778: of the command is true (hidden) if the element has a <code title="attr-hidden"><a href="editing.html#the-hidden-attribute">hidden</a></code> attribute, and false
3779: otherwise.</p>
3780:
3781: <p>The <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled
3782: State</a> of the command mirrors the <a href="forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a> state of the
3783: control.</p>
3784:
3785: <p>The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a>
3786: of the command is true if the command is of <a href="#command-facet-type" title="command-facet-Type">Type</a> "radio" or "checkbox" and the
3787: element is <a href="forms.html#concept-fe-checked" title="concept-fe-checked">checked</a>
3788: attribute, and false otherwise.</p>
3789:
3790: <p>The <a href="#command-facet-action" title="command-facet-Action">Action</a> of the
1.153 mike 3791: command, if the element has a defined <a href="embedded-content-0.html#activation-behavior">activation
3792: behavior</a>, is to <a href="embedded-content-0.html#run-synthetic-click-activation-steps">run synthetic click activation
1.788 mike 3793: steps</a> on the element. Otherwise, it is just to <a href="webappapis.html#fire-a-click-event">fire a
1.1 mike 3794: <code title="event-click">click</code> event</a> at the
3795: element.</p>
3796:
3797:
1.729 mike 3798: <h5 id="using-the-option-element-to-define-a-command"><span class="secno">4.11.5.4 </span><dfn title="option-command">Using the <code>option</code> element to define a command</dfn></h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
1.1 mike 3799:
3800: <p>An <code><a href="forms.html#the-option-element">option</a></code> element with an ancestor
3801: <code><a href="forms.html#the-select-element">select</a></code> element and either no <code title="attr-option-value"><a href="forms.html#attr-option-value">value</a></code> attribute or a <code title="attr-option-value"><a href="forms.html#attr-option-value">value</a></code> attribute that is not the
3802: empty string <a href="#concept-command" title="concept-command">defines a
3803: command</a>.</p>
3804:
3805: <p>The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command
3806: is "radio" if the <code><a href="forms.html#the-option-element">option</a></code>'s nearest ancestor
3807: <code><a href="forms.html#the-select-element">select</a></code> element has no <code title="attr-select-multiple"><a href="forms.html#attr-select-multiple">multiple</a></code> attribute, and
3808: "checkbox" if it does.</p>
3809:
3810: <p>The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is
3811: the value of the <code title="attr-id"><a href="dom.html#the-id-attribute">id</a></code> attribute of the
3812: element, if the attribute is present and not empty. Otherwise the
3813: command is an <a href="#anonymous-command">anonymous command</a>.</p>
3814:
3815: <p>The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command
3816: is the value of the <code><a href="forms.html#the-option-element">option</a></code> element's <code title="attr-option-label"><a href="forms.html#attr-option-label">label</a></code> attribute, if there is one,
3817: or the value of the <code><a href="forms.html#the-option-element">option</a></code> element's
1.804 mike 3818: <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL attribute if there isn't.</p>
1.1 mike 3819:
3820: <p>The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command
3821: is the string given by the element's <code title="attr-title"><a href="dom.html#the-title-attribute">title</a></code> attribute, if any, and the empty
3822: string if the attribute is absent.</p>
3823:
3824: <p>There is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the
3825: command.</p>
3826:
3827: <p>The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the
3828: command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>, if
3829: any.</p>
3830:
3831: <p>The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a>
3832: of the command is true (hidden) if the element has a <code title="attr-hidden"><a href="editing.html#the-hidden-attribute">hidden</a></code> attribute, and false
3833: otherwise.</p>
3834:
3835: <p>The <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled
3836: State</a> of the command is true (disabled) if the element is
3837: <a href="forms.html#concept-option-disabled" title="concept-option-disabled">disabled</a> or if its
3838: nearest ancestor <code><a href="forms.html#the-select-element">select</a></code> element is <a href="forms.html#concept-option-disabled" title="concept-option-disabled">disabled</a>, and false
3839: otherwise.</p>
3840:
3841: <p>The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a>
3842: of the command is true (checked) if the element's <a href="forms.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> is true, and
3843: false otherwise.</p>
3844:
3845: <p>The <a href="#command-facet-action" title="command-facet-Action">Action</a> of the
3846: command depends on its <a href="#command-facet-type" title="command-facet-Type">Type</a>. If the command is of <a href="#command-facet-type" title="command-facet-Type">Type</a> "radio" then it must <a href="forms.html#concept-select-pick" title="concept-select-pick">pick</a> the <code><a href="forms.html#the-option-element">option</a></code>
3847: element. Otherwise, it must <a href="forms.html#concept-select-toggle" title="concept-select-toggle">toggle</a> the <code><a href="forms.html#the-option-element">option</a></code>
3848: element.</p>
3849:
3850:
1.729 mike 3851: <h5 id="using-the-command-element-to-define-a-command"><span class="secno">4.11.5.5 </span>Using the <dfn title="command-element"><code>command</code></dfn> element to define
1.608 mike 3852: a command</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
1.1 mike 3853:
3854: <p>A <code><a href="#the-command">command</a></code> element <a href="#concept-command" title="concept-command">defines a command</a>.</p>
3855:
3856: <p>The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command
3857: is "radio" if the <code><a href="#the-command">command</a></code>'s <code title="attr-command-type"><a href="#attr-command-type">type</a></code> attribute is
3858: "<code>radio</code>", "checkbox" if the attribute's value is
3859: "<code>checkbox</code>", and "command" otherwise.</p>
3860:
3861: <p>The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is
3862: the value of the <code title="attr-id"><a href="dom.html#the-id-attribute">id</a></code> attribute of the
3863: element, if the attribute is present and not empty. Otherwise the
3864: command is an <a href="#anonymous-command">anonymous command</a>.</p>
3865:
3866: <p>The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command
3867: is the value of the element's <code title="attr-command-label"><a href="#attr-command-label">label</a></code> attribute, if there is one,
3868: or the empty string if it doesn't.</p>
3869:
3870: <p>The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command
3871: is the string given by the element's <code title="attr-command-title"><a href="#attr-command-title">title</a></code> attribute, if any, and the
3872: empty string if the attribute is absent.</p>
3873:
3874: <p>The <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the command
3875: is the <a href="infrastructure.html#absolute-url">absolute URL</a> obtained from <a href="infrastructure.html#resolve-a-url" title="resolve
3876: a url">resolving</a> the value of the element's <code title="attr-command-icon"><a href="#attr-command-icon">icon</a></code> attribute, relative to the
3877: element, if it has such an attribute and resolving it is
3878: successful. Otherwise, there is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the command.</p>
3879:
3880: <p>The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the
3881: command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>, if
3882: any.</p>
3883:
3884: <p>The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a>
3885: of the command is true (hidden) if the element has a <code title="attr-hidden"><a href="editing.html#the-hidden-attribute">hidden</a></code> attribute, and false
3886: otherwise.</p>
3887:
3888: <p>The <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled
3889: State</a> of the command is true (disabled) if the element has a
3890: <code title="attr-command-disabled"><a href="#attr-command-disabled">disabled</a></code> attribute, and
3891: false otherwise.</p>
3892:
3893: <p>The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a>
3894: of the command is true (checked) if the element has a <code title="attr-command-checked"><a href="#attr-command-checked">checked</a></code> attribute, and false
3895: otherwise.</p>
3896:
3897: <p>The <a href="#command-facet-action" title="command-facet-Action">Action</a> of the
1.153 mike 3898: command, if the element has a defined <a href="embedded-content-0.html#activation-behavior">activation
3899: behavior</a>, is to <a href="embedded-content-0.html#run-synthetic-click-activation-steps">run synthetic click activation
1.788 mike 3900: steps</a> on the element. Otherwise, it is just to <a href="webappapis.html#fire-a-click-event">fire a
1.1 mike 3901: <code title="event-click">click</code> event</a> at the
3902: element.</p>
3903:
3904:
3905:
3906:
3907:
1.729 mike 3908: <h5 id="using-the-accesskey-attribute-on-a-label-element-to-define-a-command"><span class="secno">4.11.5.6 </span><dfn title="label-command">Using the <code title="attr-accesskey">accesskey</code> attribute on a <code>label</code> element to define a command</dfn></h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
1.1 mike 3909:
3910: <p>A <code><a href="forms.html#the-label-element">label</a></code> element that has an <a href="editing.html#assigned-access-key">assigned access
3911: key</a> and a <a href="forms.html#labeled-control">labeled control</a> and whose
3912: <a href="forms.html#labeled-control">labeled control</a> <a href="#concept-command" title="concept-command">defines a
3913: command</a>, itself <a href="#concept-command" title="concept-command">defines a
3914: command</a>.</p>
3915:
3916: <p>The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command
3917: is "command".</p>
3918:
3919: <p>The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is
3920: the value of the <code title="attr-id"><a href="dom.html#the-id-attribute">id</a></code> attribute of the
3921: element, if the attribute is present and not empty. Otherwise the
3922: command is an <a href="#anonymous-command">anonymous command</a>.</p>
3923:
3924: <p>The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command
1.804 mike 3925: is the string given by the element's <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL
1.1 mike 3926: attribute.</p>
3927:
3928: <p>The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command
3929: is the value of the <code title="attr-title"><a href="dom.html#the-title-attribute">title</a></code> attribute
3930: of the element.</p>
3931:
3932: <p>There is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the
3933: command.</p>
3934:
3935: <p>The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the
3936: command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>.</p>
3937:
3938: <p>The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a>,
3939: <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a>, and
3940: <a href="#command-facet-action" title="command-facet-Action">Action</a> facets of the
3941: command are the same as the respective facets of the element's
3942: <a href="forms.html#labeled-control">labeled control</a>.</p>
3943:
3944: <p>The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a>
3945: of the command is always false. (The command is never checked.)</p>
3946:
3947:
3948:
1.729 mike 3949: <h5 id="using-the-accesskey-attribute-on-a-legend-element-to-define-a-command"><span class="secno">4.11.5.7 </span><dfn title="legend-command">Using the <code title="attr-accesskey">accesskey</code> attribute on a <code>legend</code> element to define a command</dfn></h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
1.1 mike 3950:
1.300 mike 3951: <p>A <code><a href="forms.html#the-legend-element">legend</a></code> element that has an <a href="editing.html#assigned-access-key">assigned access
1.1 mike 3952: key</a> and is a child of a <code><a href="forms.html#the-fieldset-element">fieldset</a></code> element that
1.300 mike 3953: has a descendant that is not a descendant of the <code><a href="forms.html#the-legend-element">legend</a></code>
1.1 mike 3954: element and is neither a <code><a href="forms.html#the-label-element">label</a></code> element nor a
1.300 mike 3955: <code><a href="forms.html#the-legend-element">legend</a></code> element but that <a href="#concept-command" title="concept-command">defines a command</a>, itself <a href="#concept-command" title="concept-command">defines a command</a>.</p>
1.1 mike 3956:
3957: <p>The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command
3958: is "command".</p>
3959:
3960: <p>The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is
3961: the value of the <code title="attr-id"><a href="dom.html#the-id-attribute">id</a></code> attribute of the
3962: element, if the attribute is present and not empty. Otherwise the
3963: command is an <a href="#anonymous-command">anonymous command</a>.</p>
3964:
3965: <p>The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command
1.804 mike 3966: is the string given by the element's <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL
1.1 mike 3967: attribute.</p>
3968:
3969: <p>The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command
3970: is the value of the <code title="attr-title"><a href="dom.html#the-title-attribute">title</a></code> attribute
3971: of the element.</p>
3972:
3973: <p>There is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the
3974: command.</p>
3975:
3976: <p>The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the
3977: command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>.</p>
3978:
3979: <p>The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a>,
3980: <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a>, and
3981: <a href="#command-facet-action" title="command-facet-Action">Action</a> facets of the
3982: command are the same as the respective facets of the first element
3983: in <a href="infrastructure.html#tree-order">tree order</a> that is a descendant of the parent of the
1.300 mike 3984: <code><a href="forms.html#the-legend-element">legend</a></code> element that <a href="#concept-command" title="concept-command">defines a command</a> but is not a
3985: descendant of the <code><a href="forms.html#the-legend-element">legend</a></code> element and is neither a
3986: <code><a href="forms.html#the-label-element">label</a></code> nor a <code><a href="forms.html#the-legend-element">legend</a></code> element.</p>
1.1 mike 3987:
3988: <p>The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a>
3989: of the command is always false. (The command is never checked.)</p>
3990:
3991:
3992:
1.729 mike 3993: <h5 id="using-the-accesskey-attribute-to-define-a-command-on-other-elements"><span class="secno">4.11.5.8 </span><dfn title="accesskey-command">Using the <code title="attr-accesskey">accesskey</code> attribute to define a command on other elements</dfn></h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
1.1 mike 3994:
1.28 mike 3995: <p>An element that has an <a href="editing.html#assigned-access-key">assigned access key</a> <a href="#concept-command" title="concept-command">defines a command</a>.</p>
3996:
3997: <p>If one of the other sections that define elements that <a href="#concept-command" title="concept-command">define commands</a> define that this
3998: element <a href="#concept-command" title="concept-command">defines a command</a>, then
3999: that section applies to this element, and this section does
4000: not. Otherwise, this section applies to that element.</p>
1.1 mike 4001:
4002: <p>The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command
4003: is "command".</p>
4004:
4005: <p>The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is
4006: the value of the <code title="attr-id"><a href="dom.html#the-id-attribute">id</a></code> attribute of the
4007: element, if the attribute is present and not empty. Otherwise the
4008: command is an <a href="#anonymous-command">anonymous command</a>.</p>
4009:
4010: <p>The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command
4011: depends on the element. If the element is a <a href="forms.html#labeled-control">labeled
1.804 mike 4012: control</a>, the <code><a href="infrastructure.html#textcontent">textContent</a></code> of the first
1.1 mike 4013: <code><a href="forms.html#the-label-element">label</a></code> element in <a href="infrastructure.html#tree-order">tree order</a> whose
4014: <a href="forms.html#labeled-control">labeled control</a> is the element in question is the <a href="#command-facet-label" title="command-facet-Label">Label</a> (in DOM terms, this is the
4015: string given by <code><var title="">element</var>.labels[0].textContent</code>). Otherwise, the
4016: <a href="#command-facet-label" title="command-facet-Label">Label</a> is the
1.804 mike 4017: <code><a href="infrastructure.html#textcontent">textContent</a></code> of the element itself.</p>
1.1 mike 4018:
4019: <p>The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command
4020: is the value of the <code title="attr-title"><a href="dom.html#the-title-attribute">title</a></code> attribute
4021: of the element. If the attribute is not present, the <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> is the empty string.</p>
4022:
4023: <p>There is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the
4024: command.</p>
4025:
4026: <p>The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the
4027: command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>.</p>
4028:
4029: <p>The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a>
4030: of the command is true (hidden) if the element has a <code title="attr-hidden"><a href="editing.html#the-hidden-attribute">hidden</a></code> attribute, and false
4031: otherwise.</p>
4032:
4033: <p>The <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled
4034: State</a> facet of the command is always false. (The command is
4035: always enabled.)</p>
4036:
4037: <p>The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a>
4038: of the command is always false. (The command is never checked.)</p>
4039:
4040: <p>The <a href="#command-facet-action" title="command-facet-Action">Action</a> of the
1.230 mike 4041: command is to run the following steps:</p>
4042:
4043: <ol><li>If the element is <a href="editing.html#focusable">focusable</a>, run the
4044: <a href="editing.html#focusing-steps">focusing steps</a> for the element.</li>
4045:
4046: <li>If the element has a defined <a href="embedded-content-0.html#activation-behavior">activation behavior</a>,
4047: <a href="embedded-content-0.html#run-synthetic-click-activation-steps">run synthetic click activation steps</a> on the
4048: element.</li>
4049:
4050: <li>Otherwise, if the element does not have a defined
1.788 mike 4051: <a href="embedded-content-0.html#activation-behavior">activation behavior</a>, <a href="webappapis.html#fire-a-click-event">fire a <code title="event-click">click</code> event</a> at the element.</li>
1.1 mike 4052:
1.748 mike 4053: </ol></div><h3 id="links"><span class="secno">4.12 </span>Links</h3><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><h4 id="hyperlink-elements"><span class="secno">4.12.1 </span>Hyperlink elements</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code><a href="text-level-semantics.html#the-a-element">a</a></code>, <code><a href="the-canvas-element.html#the-area-element">area</a></code>, and <code><a href="semantics.html#the-link-element">link</a></code>
4054: elements can, in certain situations described in the definitions of
4055: those elements, represent <dfn id="hyperlink" title="hyperlink">hyperlinks</dfn>.</p><p>The <dfn id="attr-hyperlink-href" title="attr-hyperlink-href"><code>href</code></dfn>
4056: attribute on a hyperlink element must have a value that is a
4057: <a href="infrastructure.html#valid-url">valid URL</a>. This URL is the <em>destination
4058: resource</em> of the hyperlink.</p><div class="note">
4059:
4060: <p>The <code title="attr-hyperlink-href"><a href="#attr-hyperlink-href">href</a></code> attribute on
4061: <code><a href="text-level-semantics.html#the-a-element">a</a></code> and <code><a href="the-canvas-element.html#the-area-element">area</a></code> elements is not required; when
4062: those elements do not have <code title="attr-hyperlink-href"><a href="#attr-hyperlink-href">href</a></code> attributes they do not
4063: represent hyperlinks.</p>
4064:
4065: <p>The <code title="attr-link-href"><a href="semantics.html#attr-link-href">href</a></code> attribute on the
4066: <code><a href="semantics.html#the-link-element">link</a></code> element <em>is</em> required, but whether a
4067: <code><a href="semantics.html#the-link-element">link</a></code> element represents a hyperlink or not depends on
4068: the value of the <code title="attr-link-rel"><a href="semantics.html#attr-link-rel">rel</a></code> attribute
4069: of that element.</p>
4070:
4071: </div><p>The <dfn id="attr-hyperlink-target" title="attr-hyperlink-target"><code>target</code></dfn>
4072: attribute, if present, must be a <a href="browsers.html#valid-browsing-context-name-or-keyword">valid browsing context name
4073: or keyword</a>. It gives the name of the <a href="browsers.html#browsing-context">browsing
4074: context</a> that will be used. <span class="impl">User agents use
4075: this name when <a href="#following-hyperlinks">following hyperlinks</a>.</span></p><p>The <dfn id="ping" title="attr-hyperlink-ping"><code>ping</code></dfn> attribute, if
4076: present, gives the URLs of the resources that are interested in
4077: being notified if the user follows the hyperlink. The value must be
4078: a <a href="infrastructure.html#set-of-space-separated-tokens">set of space-separated tokens</a>, each of which must be a
4079: <a href="infrastructure.html#valid-url" title="valid URL">valid URL</a>. <span class="impl">The
4080: value is used by the user agent for <a href="#hyperlink-auditing">hyperlink
4081: auditing</a>.</span></p><p>For <code><a href="text-level-semantics.html#the-a-element">a</a></code> and <code><a href="the-canvas-element.html#the-area-element">area</a></code> elements that represent
4082: hyperlinks, the relationship between the document containing the
4083: hyperlink and the destination resource indicated by the hyperlink is
4084: given by the value of the element's <dfn id="attr-hyperlink-rel" title="attr-hyperlink-rel"><code>rel</code></dfn> attribute, which
4085: must be a <a href="infrastructure.html#set-of-space-separated-tokens">set of space-separated tokens</a>. The <a href="#linkTypes">allowed values and their meanings</a> are defined
4086: below. The <code title="attr-hyperlink-rel"><a href="#attr-hyperlink-rel">rel</a></code> attribute has
4087: no default value. If the attribute is omitted or if none of the
4088: values in the attribute are recognized by the user agent, then the
4089: document has no particular relationship with the destination
4090: resource other than there being a hyperlink between the two.</p><p>The <dfn id="attr-hyperlink-media" title="attr-hyperlink-media"><code>media</code></dfn>
4091: attribute describes for which media the target document was
4092: designed. It is purely advisory. The value must be a <a href="infrastructure.html#valid-media-query">valid
4093: media query</a>. The default, if the <code title="attr-hyperlink-media"><a href="#attr-hyperlink-media">media</a></code> attribute is omitted, is
4094: "<code title="">all</code>".</p><p>The <dfn id="attr-hyperlink-hreflang" title="attr-hyperlink-hreflang"><code>hreflang</code></dfn>
4095: attribute on hyperlink elements, if present, gives the language of
4096: the linked resource. It is purely advisory. The value must be a
4097: valid BCP 47 language code. <a href="references.html#refsBCP47">[BCP47]</a>
4098: <span class="impl">User agents must not consider this attribute
4099: authoritative — upon fetching the resource, user agents must
4100: use only language information associated with the resource to
4101: determine its language, not metadata included in the link to the
4102: resource.</span></p><p>The <dfn id="attr-hyperlink-type" title="attr-hyperlink-type"><code>type</code></dfn>
4103: attribute, if present, gives the <a href="infrastructure.html#mime-type">MIME type</a> of the
4104: linked resource. It is purely advisory. The value must be a
4105: <a href="infrastructure.html#valid-mime-type">valid MIME type</a>. <span class="impl">User agents must
4106: not consider the <code title="attr-hyperlink-type"><a href="#attr-hyperlink-type">type</a></code>
4107: attribute authoritative — upon fetching the resource, user
4108: agents must not use metadata included in the link to the resource to
4109: determine its type.</span></p><div class="impl">
4110:
4111: <h4 id="following-hyperlinks"><span class="secno">4.12.2 </span><dfn>Following hyperlinks</dfn></h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
4112:
4113: <p>When a user <em>follows a hyperlink</em>, the user agent must
4114: <a href="infrastructure.html#resolve-a-url" title="resolve a url">resolve</a> the <a href="infrastructure.html#url">URL</a>
4115: given by the <code title="attr-hyperlink-href"><a href="#attr-hyperlink-href">href</a></code> attribute
4116: of that hyperlink, relative to the hyperlink element, and if that is
4117: successful, must <a href="history.html#navigate">navigate</a> a <a href="browsers.html#browsing-context">browsing
4118: context</a> to the resulting <a href="infrastructure.html#absolute-url">absolute URL</a>. In the
4119: case of server-side image maps, the URL of the hyperlink must
4120: further have its <var><a href="text-level-semantics.html#hyperlink-suffix">hyperlink suffix</a></var> appended to it.</p>
4121:
4122: <p>If <a href="infrastructure.html#resolve-a-url" title="resolve a url">resolving</a> the
4123: <a href="infrastructure.html#url">URL</a> fails, the user agent may report the error to the
4124: user in a user-agent-specific manner, may navigate to an error page
4125: to report the error, or may ignore the error and do nothing.</p>
4126:
4127: <p>If the user indicated a specific <a href="browsers.html#browsing-context">browsing context</a>
4128: when following the hyperlink, or if the user agent is configured to
4129: follow hyperlinks by navigating a particular browsing context, then
4130: that must be the <a href="browsers.html#browsing-context">browsing context</a> that is
4131: navigated.</p>
4132:
4133: <p>Otherwise, if the hyperlink element is an <code><a href="text-level-semantics.html#the-a-element">a</a></code> or
4134: <code><a href="the-canvas-element.html#the-area-element">area</a></code> element that has a <code title="attr-hyperlink-target"><a href="#attr-hyperlink-target">target</a></code> attribute, then the
4135: <a href="browsers.html#browsing-context">browsing context</a> that is navigated must be chosen by
4136: applying <a href="browsers.html#the-rules-for-choosing-a-browsing-context-given-a-browsing-context-name">the rules for choosing a browsing context given a
4137: browsing context name</a>, using the value of the <code title="attr-hyperlink-target"><a href="#attr-hyperlink-target">target</a></code> attribute as the
4138: browsing context name. If these rules result in the creation of a
4139: new <a href="browsers.html#browsing-context">browsing context</a>, it must be navigated with
4140: <a href="history.html#replacement-enabled">replacement enabled</a>.</p>
4141:
4142: <p>Otherwise, if the hyperlink element is a <a href="#rel-sidebar-hyperlink" title="rel-sidebar-hyperlink">sidebar hyperlink</a> and the user
4143: agent implements a feature that can be considered a secondary
4144: browsing context, such a secondary browsing context may be selected
4145: as the browsing context to be navigated.</p>
4146:
4147: <p>Otherwise, if the hyperlink element is an <code><a href="text-level-semantics.html#the-a-element">a</a></code> or
4148: <code><a href="the-canvas-element.html#the-area-element">area</a></code> element with no <code title="attr-hyperlink-target"><a href="#attr-hyperlink-target">target</a></code> attribute, but one of
4149: the child nodes of <a href="dom.html#the-head-element">the <code>head</code> element</a> is a
4150: <code><a href="semantics.html#the-base-element">base</a></code> element with a <code title="attr-base-target"><a href="semantics.html#attr-base-target">target</a></code> attribute, then the browsing
4151: context that is navigated must be chosen by applying <a href="browsers.html#the-rules-for-choosing-a-browsing-context-given-a-browsing-context-name">the rules
4152: for choosing a browsing context given a browsing context name</a>,
4153: using the value of the <code title="attr-base-target"><a href="semantics.html#attr-base-target">target</a></code>
4154: attribute of the first such <code><a href="semantics.html#the-base-element">base</a></code> element as the
4155: browsing context name. If these rules result in the creation of a
4156: new <a href="browsers.html#browsing-context">browsing context</a>, it must be navigated with
4157: <a href="history.html#replacement-enabled">replacement enabled</a>.</p>
4158:
4159: <p>Otherwise, the browsing context that must be navigated is the
4160: same browsing context as the one which the hyperlink element itself
4161: is in.</p>
4162:
4163: <p>The navigation must be done with the <a href="browsers.html#browsing-context">browsing
1.804 mike 4164: context</a> that contains the <code><a href="infrastructure.html#document">Document</a></code> object with
1.748 mike 4165: which the hyperlink's element in question is associated as the
4166: <a href="history.html#source-browsing-context">source browsing context</a>.</p>
4167:
4168:
4169: <h5 id="hyperlink-auditing"><span class="secno">4.12.2.1 </span><dfn>Hyperlink auditing</dfn></h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments. </i><span><a href="http://www.w3.org/html/wg/tracker/issues/1">ISSUE-1</a> (PINGPOST) and <a href="http://www.w3.org/html/wg/tracker/issues/2">ISSUE-2</a> (PINGUI) block progress to Last Call</span></p>
4170:
4171: <p>If an <code><a href="text-level-semantics.html#the-a-element">a</a></code> or <code><a href="the-canvas-element.html#the-area-element">area</a></code> hyperlink element has a
4172: <code title="attr-hyperlink-ping"><a href="#ping">ping</a></code> attribute, and the
4173: user follows the hyperlink, and the hyperlink's <a href="infrastructure.html#url">URL</a> can
4174: be <a href="infrastructure.html#resolve-a-url" title="resolve a url">resolved</a>, relative to the
4175: hyperlink element, without failure, then the user agent must take
4176: the <code title="attr-hyperlink-ping"><a href="#ping">ping</a></code> attribute's value,
4177: <a href="infrastructure.html#split-a-string-on-spaces" title="split a string on spaces">split that string on
4178: spaces</a>, <a href="infrastructure.html#resolve-a-url" title="resolve a url">resolve</a> each
4179: resulting token relative to the hyperlink element, and then should
4180: send a request (as described below) to each of the resulting <a href="infrastructure.html#absolute-url" title="absolute URL">absolute URLs</a>. (Tokens that fail to
4181: resolve are ignored.) This may be done in parallel with the primary
4182: request, and is independent of the result of that request.</p>
4183:
4184: <p>User agents should allow the user to adjust this behavior, for
4185: example in conjunction with a setting that disables the sending of
4186: HTTP <code title="http-referer">Referer</code> (sic) headers. Based
4187: on the user's preferences, UAs may either <a href="infrastructure.html#ignore">ignore</a> the
4188: <code title="attr-hyperlink-ping"><a href="#ping">ping</a></code> attribute altogether,
4189: or selectively ignore URLs in the list (e.g. ignoring any
4190: third-party URLs).</p>
4191:
4192: <p>For URLs that are HTTP URLs, the requests must be performed by
4193: <a href="infrastructure.html#fetch" title="fetch">fetching</a> the specified URLs using the
4194: POST method, with an entity body with the <a href="infrastructure.html#mime-type">MIME type</a>
4195: <code><a href="iana.html#text-ping">text/ping</a></code> consisting of the four-character string
4196: "<code title="">PING</code>", from the <a href="browsers.html#origin">origin</a> of the
1.804 mike 4197: <code><a href="infrastructure.html#document">Document</a></code> containing the <a href="#hyperlink">hyperlink</a>. <!--
1.748 mike 4198: not http-origin privacy sensitive --> All relevant cookie and HTTP
4199: authentication headers must be included in the request. Which other
4200: headers are required depends on the URLs involved.</p>
4201:
4202: <dl class="switch"><dt>If both the <a href="dom.html#the-document-s-address" title="the document's address">address</a>
1.804 mike 4203: of the <code><a href="infrastructure.html#document">Document</a></code> object containing the hyperlink being
1.748 mike 4204: audited and the ping URL have the <a href="browsers.html#same-origin">same origin</a></dt>
4205:
4206: <dd>The request must include a <code title="http-ping-from"><a href="iana.html#ping-from">Ping-From</a></code> HTTP header with, as its
4207: value, the <a href="dom.html#the-document-s-address" title="the document's address">address</a> of
4208: the document containing the hyperlink, and a <code title="http-ping-to"><a href="iana.html#ping-to">Ping-To</a></code> HTTP header with, as its value,
4209: the address of the <a href="infrastructure.html#absolute-url">absolute URL</a> of the target of the
4210: hyperlink. The request must not include a <code title="http-referer">Referer</code> (sic) HTTP header. <!-- because
4211: otherwise it would look like a trustable same-origin POST --></dd>
4212:
4213: <dt>Otherwise, if the origins are different, but the document
4214: containing the hyperlink being audited was not retrieved over an
4215: encrypted connection</dt>
4216:
1.765 mike 4217: <dd>The request must include a <code title="http-referer">Referer</code> (sic) HTTP header with, as its
4218: value, the <a href="dom.html#the-document-s-current-address" title="the document's current address">current
4219: address</a> of the document containing the hyperlink, a <code title="http-ping-from"><a href="iana.html#ping-from">Ping-From</a></code> HTTP header with the same
4220: value, and a <code title="http-ping-to"><a href="iana.html#ping-to">Ping-To</a></code> HTTP header
4221: with, as its value, the address of the target of the
4222: hyperlink.</dd>
1.748 mike 4223:
4224: <dt>Otherwise, the origins are different and the document
4225: containing the hyperlink being audited was retrieved over an
4226: encrypted connection</dt>
4227:
4228: <dd>The request must include a <code title="http-ping-to"><a href="iana.html#ping-to">Ping-To</a></code> HTTP header with, as its value,
4229: the address of the target of the hyperlink. The request must
4230: neither include a <code title="http-referer">Referer</code> (sic)
4231: HTTP header nor include a <code title="http-ping-from"><a href="iana.html#ping-from">Ping-From</a></code> HTTP header.</dd>
4232:
4233: </dl><p class="note">To save bandwidth, implementors might also wish to
4234: consider omitting optional headers such as <code>Accept</code> from
4235: these requests.</p>
4236:
4237: <p>User agents must, unless otherwise specified by the user, honor
4238: the HTTP headers (including, in particular, redirects and HTTP
4239: cookie headers), but must ignore any entity bodies returned in the
4240: responses. User agents may close the connection prematurely once
4241: they start receiving an entity body. <a href="references.html#refsCOOKIES">[COOKIES]</a></p>
4242:
4243: <p>For URLs that are not HTTP URLs, the requests must be performed
4244: by <a href="infrastructure.html#fetch" title="fetch">fetching</a> the specified URL normally,
4245: and discarding the results.</p>
4246:
4247: <p>When the <code title="attr-hyperlink-ping"><a href="#ping">ping</a></code> attribute is
4248: present, user agents should clearly indicate to the user that
4249: following the hyperlink will also cause secondary requests to be
4250: sent in the background, possibly including listing the actual target
4251: URLs.</p>
4252:
4253: <p class="example">For example, a visual user agent could include
4254: the hostnames of the target ping URLs along with the hyperlink's
4255: actual URL in a status bar or tooltip.</p>
4256:
4257: </div><div class="note">
4258:
4259: <p>The <code title="attr-hyperlink-ping"><a href="#ping">ping</a></code> attribute is redundant
4260: with pre-existing technologies like HTTP redirects and JavaScript
4261: in allowing Web pages to track which off-site links are most
4262: popular or allowing advertisers to track click-through rates.</p>
4263:
4264: <p>However, the <code title="attr-hyperlink-ping"><a href="#ping">ping</a></code> attribute
4265: provides these advantages to the user over those alternatives:</p>
4266:
4267: <ul><li>It allows the user to see the final target URL
4268: unobscured.</li>
4269:
4270: <li>It allows the UA to inform the user about the out-of-band
4271: notifications.</li>
4272:
4273: <li>It allows the user to disable the notifications without losing
4274: the underlying link functionality.</li>
4275:
4276: <li>It allows the UA to optimize the use of available network
4277: bandwidth so that the target page loads faster.</li>
4278:
4279: </ul><p>Thus, while it is possible to track users without this feature,
4280: authors are encouraged to use the <code title="attr-hyperlink-ping"><a href="#ping">ping</a></code> attribute so that the user
4281: agent can make the user experience more transparent.</p>
4282:
4283: </div><!-- resolving ping urls happens at audit time, so base URL changes
4284: affect the values of ping attributes --><h4 id="linkTypes"><span class="secno">4.12.3 </span>Link types</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The following table summarizes the link types that are defined by
4285: this specification. This table is non-normative; the actual
4286: definitions for the link types are given in the next few
4287: sections.</p><p>In this section, the term <i>referenced document</i> refers to
4288: the resource identified by the element representing the link, and
4289: the term <i>current document</i> refers to the resource within
4290: which the element representing the link finds itself.</p><div class="impl">
4291:
4292: <p>To determine which link types apply to a <code><a href="semantics.html#the-link-element">link</a></code>,
4293: <code><a href="text-level-semantics.html#the-a-element">a</a></code>, or <code><a href="the-canvas-element.html#the-area-element">area</a></code> element, the element's <code title="">rel</code> attribute must be <a href="infrastructure.html#split-a-string-on-spaces" title="split a string on
4294: spaces">split on spaces</a>. The resulting tokens are the link
4295: types that apply to that element.</p>
4296:
4297: </div><p>Except where otherwise specified, a keyword must not be specified
4298: more than once per <code title="attr-rel-hyperlink">rel</code>
4299: attribute.</p><p>The link types that contain no U+003A COLON characters (:),
4300: including all those defined in this specification, are <a href="infrastructure.html#ascii-case-insensitive">ASCII
4301: case-insensitive</a> values<span class="impl">, and must be
4302: compared as such</span>.</p><p class="example">Thus, <code title="">rel="next"</code> is the
4303: same as <code title="">rel="NEXT"</code>.</p><table><thead><tr><th rowspan="2">Link type</th>
4304: <th colspan="2">Effect on...</th>
4305: <th rowspan="2">Brief description</th>
4306: </tr><tr><th><code><a href="semantics.html#the-link-element">link</a></code></th>
4307: <th><code><a href="text-level-semantics.html#the-a-element">a</a></code> and <code><a href="the-canvas-element.html#the-area-element">area</a></code></th>
4308: </tr></thead><tbody><tr><td><code title="rel-alternate"><a href="#link-type-alternate">alternate</a></code></td> <!-- second most used <link rel> value -->
4309: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4310: <td><a href="#hyperlink">Hyperlink</a></td>
4311: <td>Gives alternate representations of the current document.</td>
4312: </tr><tr><td><code title="rel-archives"><a href="#link-type-archives">archives</a></code></td>
4313: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4314: <td><a href="#hyperlink">Hyperlink</a></td>
4315: <td>Provides a link to a collection of records, documents, or other materials of historical interest.</td>
4316: </tr><tr><td><code title="rel-author"><a href="#link-type-author">author</a></code></td>
4317: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4318: <td><a href="#hyperlink">Hyperlink</a></td>
4319: <td>Gives a link to the current document's author.</td>
4320: </tr><tr><td><code title="rel-bookmark"><a href="#link-type-bookmark">bookmark</a></code></td> <!-- fourth most used <a rel> value -->
4321: <td><em>not allowed</em></td>
4322: <td><a href="#hyperlink">Hyperlink</a></td>
4323: <td>Gives the permalink for the nearest ancestor section.</td>
4324: </tr><!-- (commented out on the assumption that rel=contact is really XFN)
4325: <tr>
4326: <td><code title="rel-contact">contact</code></td> <!- 8th most used <a rel> value ->
4327: <td><span title="hyperlink link">Hyperlink</span></td>
4328: <td><span>Hyperlink</span></td>
4329: <td>Gives a link to contact information for the current document.</td>
4330: </tr>
4331: --><tr><td><code title="rel-external"><a href="#link-type-external">external</a></code></td> <!-- fifth and sixth most used <a rel> value (sixth is "external nofollow") -->
4332: <td><em>not allowed</em></td>
4333: <td><a href="#hyperlink">Hyperlink</a></td>
4334: <td>Indicates that the referenced document is not part of the same site as the current document.</td>
4335: </tr><tr><td><code title="rel-first"><a href="#link-type-first">first</a></code></td>
4336: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4337: <td><a href="#hyperlink">Hyperlink</a></td>
4338: <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>
4339: </tr><tr><td><code title="rel-help"><a href="#link-type-help">help</a></code></td>
4340: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4341: <td><a href="#hyperlink">Hyperlink</a></td>
4342: <td>Provides a link to context-sensitive help.</td>
4343: </tr><tr><td><code title="rel-icon"><a href="#rel-icon">icon</a></code></td> <!-- link rel="shortcut icon" and its ilk are the fourth, sixth, and ninth most used values -->
4344: <td><a href="semantics.html#external-resource-link" title="external resource link">External Resource</a></td>
4345: <td><em>not allowed</em></td>
4346: <td>Imports an icon to represent the current document.</td>
4347: </tr><tr><td><code title="rel-index"><a href="#link-type-index">index</a></code></td> <!-- used more than "top" and "contents" on <link> (though on <a>, "contents" wins) -->
4348: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4349: <td><a href="#hyperlink">Hyperlink</a></td>
4350: <td>Gives a link to the document that provides a table of contents or index listing the current document.</td>
4351: </tr><tr><td><code title="rel-last"><a href="#link-type-last">last</a></code></td>
4352: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4353: <td><a href="#hyperlink">Hyperlink</a></td>
4354: <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>
4355: </tr><tr><td><code title="rel-license"><a href="#link-type-license">license</a></code></td> <!-- seventh most used <a rel> value -->
4356: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4357: <td><a href="#hyperlink">Hyperlink</a></td>
4358: <td>Indicates that the main content of the current document is covered by the copyright license described by the referenced document.</td>
4359: </tr><tr><td><code title="rel-next"><a href="#link-type-next">next</a></code></td>
4360: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4361: <td><a href="#hyperlink">Hyperlink</a></td>
4362: <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>
4363: </tr><tr><td><code title="rel-nofollow"><a href="#link-type-nofollow">nofollow</a></code></td> <!-- most used <a rel> value (and sixth most used is "external nofollow") -->
4364: <td><em>not allowed</em></td>
4365: <td><a href="#hyperlink">Hyperlink</a></td>
4366: <td>Indicates that the current document's original author or publisher does not endorse the referenced document.</td>
4367: </tr><tr><td><code title="rel-noreferrer"><a href="#link-type-noreferrer">noreferrer</a></code></td>
4368: <td><em>not allowed</em></td>
4369: <td><a href="#hyperlink">Hyperlink</a></td>
4370: <td>Requires that the user agent not send an HTTP <code title="http-referer">Referer</code> (sic) header if the user follows the hyperlink.</td>
4371: </tr><tr><td><code title="rel-pingback"><a href="#link-type-pingback">pingback</a></code></td>
4372: <td><a href="semantics.html#external-resource-link" title="external resource link">External Resource</a></td>
4373: <td><em>not allowed</em></td>
4374: <td>Gives the address of the pingback server that handles pingbacks to the current document.</td>
4375: </tr><tr><td><code title="rel-prefetch"><a href="#link-type-prefetch">prefetch</a></code></td>
4376: <td><a href="semantics.html#external-resource-link" title="external resource link">External Resource</a></td>
4377: <td><em>not allowed</em></td>
4378: <td>Specifies that the target resource should be preemptively cached.</td>
4379: </tr><tr><td><code title="rel-prev"><a href="#link-type-prev">prev</a></code></td> <!-- prev is used more than previous -->
4380: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4381: <td><a href="#hyperlink">Hyperlink</a></td>
4382: <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>
4383: </tr><tr><td><code title="rel-search"><a href="#link-type-search">search</a></code></td> <!-- used quite a bit -->
4384: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4385: <td><a href="#hyperlink">Hyperlink</a></td>
4386: <td>Gives a link to a resource that can be used to search through the current document and its related pages.</td>
4387: </tr><tr><td><code title="rel-stylesheet"><a href="#link-type-stylesheet">stylesheet</a></code></td> <!-- most commonly used <link rel> value, variants came in 7th, 8th, 12th, 17th... -->
4388: <td><a href="semantics.html#external-resource-link" title="external resource link">External Resource</a></td>
4389: <td><em>not allowed</em></td>
4390: <td>Imports a stylesheet.</td>
4391: </tr><tr><td><code title="rel-sidebar"><a href="#link-type-sidebar">sidebar</a></code></td> <!-- used quite a bit -->
4392: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4393: <td><a href="#hyperlink">Hyperlink</a></td>
4394: <td>Specifies that the referenced document, if retrieved, is intended to be shown in the browser's sidebar (if it has one).</td>
4395: </tr><tr><td><code title="rel-tag"><a href="#link-type-tag">tag</a></code></td> <!-- second and third most used <a rel> value (third is technically "category tag"). -->
4396: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4397: <td><a href="#hyperlink">Hyperlink</a></td>
4398: <td>Gives a tag (identified by the given address) that applies to the current document.</td>
4399: </tr><tr><td><code title="rel-up"><a href="#link-type-up">up</a></code></td>
4400: <td><a href="semantics.html#hyperlink-link" title="hyperlink link">Hyperlink</a></td>
4401: <td><a href="#hyperlink">Hyperlink</a></td>
4402: <td>Provides a link to a document giving the context for the current document.</td>
4403: </tr></tbody></table><div class="impl">
4404:
4405: <p>Some of the types described below list synonyms for these
4406: values. These <!--<span class="impl">-->are to be handled as
4407: specified by user agents, but<!--</span>--> must not be used in
4408: documents.</p>
4409:
4410: </div><!-- v2 ideas:
4411: * rel="script"
4412: * rel="related" // see also
4413: * http://microformats.org/wiki/rel-enclosure
4414: --><h5 id="link-type-alternate"><span class="secno">4.12.3.1 </span>Link type "<dfn title="rel-alternate"><code>alternate</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-alternate"><a href="#link-type-alternate">alternate</a></code> keyword may be
4415: used with <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4416: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, if the <code title="attr-link-rel"><a href="semantics.html#attr-link-rel">rel</a></code> attribute does not also contain the
4417: keyword <code title="rel-stylesheet"><a href="#link-type-stylesheet">stylesheet</a></code>, it creates a
4418: <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>; but if it
4419: <em>does</em> also contain the keyword <code title="rel-stylesheet"><a href="#link-type-stylesheet">stylesheet</a></code>, the <code title="rel-alternate"><a href="#link-type-alternate">alternate</a></code> keyword instead modifies the
4420: meaning of the <code title="rel-stylesheet"><a href="#link-type-stylesheet">stylesheet</a></code>
4421: keyword in the way described for that keyword, and the rest of this
4422: subsection doesn't apply.</p><p>The <code title="rel-alternate"><a href="#link-type-alternate">alternate</a></code> keyword
4423: indicates that the referenced document is an alternate
4424: representation of the current document.</p><p>The nature of the referenced document is given by the <code title="attr-hyperlink-media"><a href="#attr-hyperlink-media">media</a></code>, <code title="attr-hyperlink-hreflang"><a href="#attr-hyperlink-hreflang">hreflang</a></code>, and <code title="attr-hyperlink-type"><a href="#attr-hyperlink-type">type</a></code> attributes.</p><p>If the <code title="rel-alternate"><a href="#link-type-alternate">alternate</a></code> keyword is
4425: used with the <code title="attr-hyperlink-media"><a href="#attr-hyperlink-media">media</a></code>
4426: attribute, it indicates that the referenced document is intended for
4427: use with the media specified.</p><p>If the <code title="rel-alternate"><a href="#link-type-alternate">alternate</a></code> keyword is
4428: used with the <code title="attr-hyperlink-hreflang"><a href="#attr-hyperlink-hreflang">hreflang</a></code>
4429: attribute, and that attribute's value differs from the <a href="infrastructure.html#root-element">root
4430: element</a>'s <a href="dom.html#language">language</a>, it indicates that the
4431: referenced document is a translation.</p><p>If the <code title="rel-alternate"><a href="#link-type-alternate">alternate</a></code> keyword is
4432: used with the <code title="attr-hyperlink-type"><a href="#attr-hyperlink-type">type</a></code>
4433: attribute, it indicates that the referenced document is a
4434: reformulation of the current document in the specified format.</p><p>The <code title="attr-hyperlink-media"><a href="#attr-hyperlink-media">media</a></code>, <code title="attr-hyperlink-hreflang"><a href="#attr-hyperlink-hreflang">hreflang</a></code>, and <code title="attr-hyperlink-type"><a href="#attr-hyperlink-type">type</a></code> attributes can be combined
4435: when specified with the <code title="rel-alternate"><a href="#link-type-alternate">alternate</a></code>
4436: keyword.</p><div class="example">
4437:
4438: <p>For example, the following link is a French translation that
4439: uses the PDF format:</p>
4440:
4441: <pre><link rel=alternate type=application/pdf hreflang=fr href=manual-fr></pre>
4442:
4443: </div><div class="impl">
4444:
4445: <p>If the <code title="rel-alternate"><a href="#link-type-alternate">alternate</a></code> keyword is
4446: used with the <code title="attr-hyperlink-type"><a href="#attr-hyperlink-type">type</a></code>
4447: attribute set to the value <code title="">application/rss+xml</code>
4448: or the value <code title="">application/atom+xml</code>, then it
4449: indicates that the referenced document is a syndication feed (though
4450: not necessarily syndicating exactly the same content as the current
4451: page).</p>
4452:
4453: <div class="impl">
4454:
4455: <p>The first <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, or <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4456: element in the document (in tree order) with the <code title="rel-alternate"><a href="#link-type-alternate">alternate</a></code> keyword used with the <code title="attr-hyperlink-type"><a href="#attr-hyperlink-type">type</a></code> attribute set to the value
4457: <code title="">application/rss+xml</code> or the value <code title="">application/atom+xml</code> must be treated as the default
4458: syndication feed for the purposes of feed autodiscovery.</p>
4459:
4460: <div class="example">
4461: <p>The following <code><a href="semantics.html#the-link-element">link</a></code> element gives the syndication
4462: feed for the current page:</p>
4463: <pre><link rel="alternate" type="application/atom+xml" href="data.xml"></pre>
4464: <p>The following extract offers various different syndication
4465: feeds:</p>
4466: <pre><p>You can access the planets database using Atom feeds:</p>
4467: <ul>
4468: <li><a href="recently-visited-planets.xml" rel="alternate" type="application/atom+xml">Recently Visited Planets</a></li>
4469: <li><a href="known-bad-planets.xml" rel="alternate" type="application/atom+xml">Known Bad Planets</a></li>
4470: <li><a href="unexplored-planets.xml" rel="alternate" type="application/atom+xml">Unexplored Planets</a></li>
4471: </ul></pre>
4472: </div>
4473:
4474: </div>
4475:
4476:
4477:
4478:
4479: </div><p>The <code title="rel-alternate"><a href="#link-type-alternate">alternate</a></code> link
4480: relationship is transitive — that is, if a document links to
4481: two other documents with the link type "<code title="rel-alternate"><a href="#link-type-alternate">alternate</a></code>", then, in addition to
4482: implying that those documents are alternative representations of the
4483: first document, it is also implying that those two documents are
4484: alternative representations of each other.</p><h5 id="link-type-archives"><span class="secno">4.12.3.2 </span>Link type "<dfn title="rel-archives"><code>archives</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-archives"><a href="#link-type-archives">archives</a></code> keyword may be
4485: used with <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4486: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>.</p><p>The <code title="rel-archives"><a href="#link-type-archives">archives</a></code> keyword indicates
4487: that the referenced document describes a collection of records,
4488: documents, or other materials of historical interest.</p><p class="example">A blog's index page could link to an index of the
4489: blog's past posts with <code title="">rel="archives"</code>.</p><div class="impl">
4490:
4491: <p><strong>Synonyms</strong>: For historical reasons, user agents
4492: must also treat the keyword "<code title="">archive</code>" like the
4493: <code title="rel-archives"><a href="#link-type-archives">archives</a></code> keyword.</p>
4494:
4495: </div><h5 id="link-type-author"><span class="secno">4.12.3.3 </span>Link type "<dfn title="rel-author"><code>author</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-author"><a href="#link-type-author">author</a></code> keyword may be
4496: used with <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4497: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>.</p><p>For <code><a href="text-level-semantics.html#the-a-element">a</a></code> and <code><a href="the-canvas-element.html#the-area-element">area</a></code> elements, the <code title="rel-author"><a href="#link-type-author">author</a></code> keyword indicates that the
4498: referenced document provides further information about the author of
4499: the nearest <code><a href="semantics.html#the-article-element">article</a></code> element ancestor of the element
4500: defining the hyperlink, if there is one, or of the page as a whole,
4501: otherwise.</p><p>For <code><a href="semantics.html#the-link-element">link</a></code> elements, the <code title="rel-author"><a href="#link-type-author">author</a></code> keyword indicates that the
4502: referenced document provides further information about the author
4503: for the page as a whole.</p><p class="note">The "referenced document" can be, and often is, a
4504: <code title="">mailto:</code> URL giving the e-mail address of the
4505: author. <a href="references.html#refsMAILTO">[MAILTO]</a></p><div class="impl">
4506:
4507: <p><strong>Synonyms</strong>: For historical reasons, user agents
4508: must also treat <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and
4509: <code><a href="the-canvas-element.html#the-area-element">area</a></code> elements that have a <code title="">rev</code>
4510: attribute with the value "<code>made</code>" as having the <code title="rel-author"><a href="#link-type-author">author</a></code> keyword specified as a link
4511: relationship.</p>
4512:
4513: </div><h5 id="link-type-bookmark"><span class="secno">4.12.3.4 </span>Link type "<dfn title="rel-bookmark"><code>bookmark</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-bookmark"><a href="#link-type-bookmark">bookmark</a></code> keyword may be
4514: used with <code><a href="text-level-semantics.html#the-a-element">a</a></code> and <code><a href="the-canvas-element.html#the-area-element">area</a></code> elements.</p><p>The <code title="rel-bookmark"><a href="#link-type-bookmark">bookmark</a></code> keyword gives a
4515: permalink for the nearest ancestor <code><a href="semantics.html#the-article-element">article</a></code> element of
4516: the linking element in question, or of <a href="semantics.html#associatedSection">the section the linking element is most
4517: closely associated with</a>, if there are no ancestor
4518: <code><a href="semantics.html#the-article-element">article</a></code> elements.</p><div class="example">
4519: <p>The following snippet has three permalinks. A user agent could
4520: determine which permalink applies to which part of the spec by
4521: looking at where the permalinks are given.</p>
4522: <pre> ...
4523: <body>
4524: <h1>Example of permalinks</h1>
4525: <div id="a">
4526: <h2>First example</h2>
4527: <p><a href="a.html" rel="bookmark">This</a> permalink applies to
4528: only the content from the first H2 to the second H2. The DIV isn't
4529: exactly that section, but it roughly corresponds to it.</p>
4530: </div>
4531: <h2>Second example</h2>
4532: <article id="b">
4533: <p><a href="b.html" rel="bookmark">This</a> permalink applies to
4534: the outer ARTICLE element (which could be, e.g., a blog post).</p>
4535: <article id="c">
4536: <p><a href="c.html" rel="bookmark">This</a> permalink applies to
4537: the inner ARTICLE element (which could be, e.g., a blog comment).</p>
4538: </article>
4539: </article>
4540: </body>
4541: ...</pre>
4542: </div><!-- (commented out on the assumption that rel=contact is really XFN)
4543: <h5>Link type "<dfn title="rel-contact"><code>contact</code></dfn>"</h5>
4544:
4545: <p>The <code title="rel-contact">contact</code> keyword may be used
4546: with <code>link</code>, <code>a</code>, and <code>area</code>
4547: elements. For <code>link</code> elements, it creates a <span
4548: title="hyperlink link">hyperlink</span>.</p>
4549:
4550: <p>For <code>a</code> and <code>area</code> elements, the <code
4551: title="rel-contact">contact</code> keyword indicates that the
4552: referenced document provides further contact information for the
4553: author of the nearest <code>article</code> element ancestor of the
4554: element defining the hyperlink, if there is one, or of the page as a
4555: whole, otherwise.</p>
4556:
4557: <div class="impl">
4558:
4559: <p>User agents must treat any hyperlink in an <code>address</code>
4560: element as having the <code title="rel-contact">contact</code> link
4561: type specified.</p>
4562:
4563: </div>
4564:
4565: <p>For <code>link</code> elements, the <code
4566: title="rel-contact">contact</code> keyword indicates that the
4567: referenced document provides further contact information for the
4568: page as a whole.</p>
4569: --><h5 id="link-type-external"><span class="secno">4.12.3.5 </span>Link type "<dfn title="rel-external"><code>external</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-external"><a href="#link-type-external">external</a></code> keyword may be
4570: used with <code><a href="text-level-semantics.html#the-a-element">a</a></code> and <code><a href="the-canvas-element.html#the-area-element">area</a></code> elements.</p><p>The <code title="rel-external"><a href="#link-type-external">external</a></code> keyword indicates
4571: that the link is leading to a document that is not part of the site
4572: that the current document forms a part of.</p><h5 id="link-type-help"><span class="secno">4.12.3.6 </span>Link type "<dfn title="rel-help"><code>help</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-help"><a href="#link-type-help">help</a></code> keyword may be used with
4573: <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4574: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>.</p><p>For <code><a href="text-level-semantics.html#the-a-element">a</a></code> and <code><a href="the-canvas-element.html#the-area-element">area</a></code> elements, the <code title="rel-help"><a href="#link-type-help">help</a></code> keyword indicates that the referenced
4575: document provides further help information for the parent of the
4576: element defining the hyperlink, and its children.</p><div class="example">
4577:
4578: <p>In the following example, the form control has associated
4579: context-sensitive help. The user agent could use this information,
4580: for example, displaying the referenced document if the user presses
4581: the "Help" or "F1" key.</p>
4582:
4583: <pre> <p><label> Topic: <input name=topic> <a href="help/topic.html" rel="help">(Help)</a></label></p></pre>
4584:
4585: </div><p>For <code><a href="semantics.html#the-link-element">link</a></code> elements, the <code title="rel-help"><a href="#link-type-help">help</a></code> keyword indicates that the referenced
4586: document provides help for the page as a whole.</p><h5 id="rel-icon"><span class="secno">4.12.3.7 </span>Link type "<dfn title="rel-icon"><code>icon</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-icon"><a href="#rel-icon">icon</a></code> keyword may be used with
4587: <code><a href="semantics.html#the-link-element">link</a></code> elements, for which it creates an <a href="semantics.html#external-resource-link" title="external resource link">external resource link</a>.</p><div class="impl">
4588:
4589: <p>The specified resource is an icon representing the page or site,
4590: and should be used by the user agent when representing the page in
4591: the user interface.</p>
4592:
4593: </div><p>Icons could be auditory icons, visual icons, or other kinds of
4594: icons. <span class="impl">If multiple icons are provided, the user
4595: agent must select the most appropriate icon according to the <code title="attr-link-type"><a href="semantics.html#attr-link-type">type</a></code>, <code title="attr-link-media"><a href="semantics.html#attr-link-media">media</a></code>, and <code title="attr-link-sizes"><a href="#attr-link-sizes">sizes</a></code> attributes. If there are
4596: multiple equally appropriate icons, user agents must use the last
4597: one declared in <a href="infrastructure.html#tree-order">tree order</a>. If the user agent tries to
4598: use an icon but that icon is determined, upon closer examination, to
4599: in fact be inappropriate (e.g. because it uses an unsupported
4600: format), then the user agent must try the next-most-appropriate icon
4601: as determined by the attributes.</span></p><div class="impl">
4602:
4603: <p>There is no default type for resources given by the <code title="rel-icon"><a href="#rel-icon">icon</a></code> keyword. However, for the purposes of
4604: <a href="semantics.html#concept-link-type-sniffing">determining the type of the
4605: resource</a>, user agents must expect the resource to be an image.</p>
4606:
4607: </div><p>The <dfn id="attr-link-sizes" title="attr-link-sizes"><code>sizes</code></dfn>
4608: attribute gives the sizes of icons for visual media.</p><p>If specified, the attribute must have a value that is an
4609: <a href="infrastructure.html#unordered-set-of-unique-space-separated-tokens">unordered set of unique space-separated tokens</a>. The
4610: values must all be either <code title="attr-link-sizes-any"><a href="#attr-link-sizes-any">any</a></code> or a value that consists of
4611: two <a href="infrastructure.html#valid-non-negative-integer" title="valid non-negative integer">valid non-negative
4612: integers</a> that do not have a leading U+0030 DIGIT ZERO (0)
4613: character and that are separated by a single U+0078 LATIN SMALL
4614: LETTER X character (x).</p><p>The keywords represent icon sizes.</p><div class="impl">
4615:
4616: <p>To parse and process the attribute's value, the user agent must
4617: first <a href="infrastructure.html#split-a-string-on-spaces" title="split a string on spaces">split the attribute's
4618: value on spaces</a>, and must then parse each resulting keyword
4619: to determine what it represents.</p>
4620:
4621: </div><p>The <dfn id="attr-link-sizes-any" title="attr-link-sizes-any"><code>any</code></dfn> keyword
4622: represents that the resource contains a scalable icon, e.g. as
4623: provided by an SVG image.</p><div class="impl">
4624:
4625: <p>Other keywords must be further parsed as follows to determine
4626: what they represent:</p>
4627:
4628: <ul><li><p>If the keyword doesn't contain exactly one U+0078 LATIN
4629: SMALL LETTER X character (x), then this keyword doesn't represent
4630: anything. Abort these steps for that keyword.</p></li>
4631:
4632: <li><p>Let <var title="">width string</var> be the string before
4633: the "<code title="">x</code>".</p></li>
4634:
4635: <li><p>Let <var title="">height string</var> be the string after the
4636: "<code title="">x</code>".</p></li>
4637:
4638: <li><p>If either <var title="">width string</var> or <var title="">height string</var> start with a U+0030 DIGIT ZERO (0)
4639: character or contain any characters other than characters in the
4640: range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), then this
4641: keyword doesn't represent anything. Abort these steps for that
4642: keyword.</p></li>
4643:
4644: <li><p>Apply the <a href="infrastructure.html#rules-for-parsing-non-negative-integers">rules for parsing non-negative
4645: integers</a> to <var title="">width string</var> to obtain <var title="">width</var>.</p></li>
4646:
4647: <li><p>Apply the <a href="infrastructure.html#rules-for-parsing-non-negative-integers">rules for parsing non-negative
4648: integers</a> to <var title="">height string</var> to obtain <var title="">height</var>.</p></li>
4649:
4650: <li><p>The keyword represents that the resource contains a bitmap
4651: icon with a width of <var title="">width</var> device pixels and a
4652: height of <var title="">height</var> device pixels.</p></li>
4653:
4654: </ul></div><p>The keywords specified on the <code title="attr-link-sizes"><a href="#attr-link-sizes">sizes</a></code> attribute must not represent
4655: icon sizes that are not actually available in the linked
4656: resource.</p><div class="impl">
4657:
4658: <p>If the attribute is not specified, then the user agent must
4659: assume that the given icon is appropriate, but less appropriate than
4660: an icon of a known and appropriate size.</p>
4661:
4662: </div><div class="example">
4663:
4664: <p>The following snippet shows the top part of an application with
4665: several icons.</p>
4666:
4667: <pre><!DOCTYPE HTML>
4668: <html>
4669: <head>
4670: <title>lsForums — Inbox</title>
4671: <link rel=icon href=favicon.png sizes="16x16" type="image/png">
4672: <link rel=icon href=windows.ico sizes="32x32 48x48" type="image/vnd.microsoft.icon">
4673: <link rel=icon href=mac.icns sizes="128x128 512x512 8192x8192 32768x32768">
4674: <link rel=icon href=iphone.png sizes="59x60" type="image/png">
4675: <link rel=icon href=gnome.svg sizes="any" type="image/svg+xml">
4676: <link rel=stylesheet href=lsforums.css>
4677: <script src=lsforums.js></script>
4678: <meta name=application-name content="lsForums">
4679: </head>
4680: <body>
4681: ...</pre>
4682:
4683: </div><h5 id="link-type-license"><span class="secno">4.12.3.8 </span>Link type "<dfn title="rel-license"><code>license</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-license"><a href="#link-type-license">license</a></code> keyword may be used
4684: with <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4685: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>.</p><p>The <code title="rel-license"><a href="#link-type-license">license</a></code> keyword indicates
4686: that the referenced document provides the copyright license terms
4687: under which the main content of the current document is
4688: provided.</p><p>This specification does not specify how to distinguish between
4689: the main content of a document and content that is not deemed to be
4690: part of that main content. The distinction should be made clear to
4691: the user.</p><div class="example">
4692:
4693: <p>Consider a photo sharing site. A page on that site might
4694: describe and show a photograph, and the page might be marked up as
4695: follows:</p>
4696:
4697: <pre><!DOCTYPE HTML>
4698: <html>
4699: <head>
4700: <title>Exampl Pictures: Kissat</title>
4701: <link rel="stylesheet" href="/style/default">
4702: </head>
4703: <body>
4704: <h1>Kissat</h1>
4705: <nav>
4706: <a href="../">Return to photo index</a>
4707: </nav>
4708: <figure>
4709: <img src="/pix/39627052_fd8dcd98b5.jpg">
4710: <figcaption>Kissat</figcaption>
4711: </figure>
4712: <p>One of them has six toes!</p>
4713: <p><small><a rel="license" href="http://www.opensource.org/licenses/mit-license.php">MIT Licensed</a></small></p>
4714: <footer>
4715: <a href="/">Home</a> | <a href="../">Photo index</a>
4716: <p><small>© copyright 2009 Exampl Pictures. All Rights Reserved.</small></p>
4717: </footer>
4718: </body>
4719: </html></pre>
4720:
4721: <p>In this case the <code title="rel-license"><a href="#link-type-license">license</a></code>
4722: applies to just the photo (the main content of the document), not
4723: the whole document. In particular not the design of the page
4724: itself, which is covered by the copyright given at the bottom of
4725: the document. This could be made clearer in the styling
4726: (e.g. making the license link prominently positioned near the
4727: photograph, while having the page copyright in light small text at
4728: the foot of the page.</p>
4729:
4730: </div><div class="impl">
4731:
4732: <p><strong>Synonyms</strong>: For historical reasons, user agents
4733: must also treat the keyword "<code title="">copyright</code>" like
4734: the <code title="rel-license"><a href="#link-type-license">license</a></code> keyword.</p>
4735:
4736: </div><h5 id="link-type-nofollow"><span class="secno">4.12.3.9 </span>Link type "<dfn title="rel-nofollow"><code>nofollow</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-nofollow"><a href="#link-type-nofollow">nofollow</a></code> keyword may be
4737: used with <code><a href="text-level-semantics.html#the-a-element">a</a></code> and <code><a href="the-canvas-element.html#the-area-element">area</a></code> elements.</p><p>The <code title="rel-nofollow"><a href="#link-type-nofollow">nofollow</a></code> keyword indicates
4738: that the link is not endorsed by the original author or publisher of
4739: the page, or that the link to the referenced document was included
4740: primarily because of a commercial relationship between people
4741: affiliated with the two pages.</p><h5 id="link-type-noreferrer"><span class="secno">4.12.3.10 </span>Link type "<dfn title="rel-noreferrer"><code>noreferrer</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-noreferrer"><a href="#link-type-noreferrer">noreferrer</a></code> keyword may be
4742: used with <code><a href="text-level-semantics.html#the-a-element">a</a></code> and <code><a href="the-canvas-element.html#the-area-element">area</a></code> elements.</p><p>It indicates that no referrer information is to be leaked when
4743: following the link.</p><div class="impl">
4744:
4745: <p>If a user agent follows a link defined by an <code><a href="text-level-semantics.html#the-a-element">a</a></code> or
4746: <code><a href="the-canvas-element.html#the-area-element">area</a></code> element that has the <code title="rel-noreferrer"><a href="#link-type-noreferrer">noreferrer</a></code> keyword, the user agent
4747: must not include a <code title="http-referer">Referer</code> (sic)
4748: HTTP header (<a href="infrastructure.html#concept-http-equivalent-headers" title="concept-http-equivalent-headers">or
4749: equivalent</a> for other protocols) in the request.</p>
4750:
4751: <p>This keyword also <a href="browsers.html#noopener">causes the <code title="dom-opener">opener</code> attribute to remain null</a> if the
4752: hyperlink creates a new <a href="browsers.html#browsing-context">browsing context</a>.</p>
4753:
4754: </div><!-- v2: Would be nice to apply this to other elements too,
4755: e.g. letting <img> or CSS or <video> hide the referrer --><h5 id="link-type-pingback"><span class="secno">4.12.3.11 </span>Link type "<dfn title="rel-pingback"><code>pingback</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-pingback"><a href="#link-type-pingback">pingback</a></code> keyword may be
4756: used with <code><a href="semantics.html#the-link-element">link</a></code> elements, for which it creates an <a href="semantics.html#external-resource-link" title="external resource link">external resource link</a>.</p><p>For the semantics of the <code title="rel-pingback"><a href="#link-type-pingback">pingback</a></code> keyword, see the Pingback 1.0
4757: specification. <a href="references.html#refsPINGBACK">[PINGBACK]</a></p><h5 id="link-type-prefetch"><span class="secno">4.12.3.12 </span>Link type "<dfn title="rel-prefetch"><code>prefetch</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-prefetch"><a href="#link-type-prefetch">prefetch</a></code> keyword may be
4758: used with <code><a href="semantics.html#the-link-element">link</a></code> elements, for which it creates an <a href="semantics.html#external-resource-link" title="external resource link">external resource link</a>.</p><p>The <code title="rel-prefetch"><a href="#link-type-prefetch">prefetch</a></code> keyword indicates
4759: that preemptively fetching and caching the specified resource is
4760: likely to be beneficial, as it is highly likely that the user will
4761: require this resource.</p><p>There is no default type for resources given by the <code title="rel-prefetch"><a href="#link-type-prefetch">prefetch</a></code> keyword.</p><h5 id="link-type-search"><span class="secno">4.12.3.13 </span>Link type "<dfn title="rel-search"><code>search</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-search"><a href="#link-type-search">search</a></code> keyword may be used
4762: with <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4763: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>.</p><p>The <code title="rel-search"><a href="#link-type-search">search</a></code> keyword indicates that
4764: the referenced document provides an interface specifically for
4765: searching the document and its related resources.</p><p class="note">OpenSearch description documents can be used with
4766: <code><a href="semantics.html#the-link-element">link</a></code> elements and the <code title="rel-search"><a href="#link-type-search">search</a></code> link type to enable user agents to
4767: autodiscover search interfaces. <a href="references.html#refsOPENSEARCH">[OPENSEARCH]</a></p><h5 id="link-type-stylesheet"><span class="secno">4.12.3.14 </span>Link type "<dfn title="rel-stylesheet"><code>stylesheet</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-stylesheet"><a href="#link-type-stylesheet">stylesheet</a></code> keyword may be
4768: used with <code><a href="semantics.html#the-link-element">link</a></code> elements, for which it creates an <a href="semantics.html#external-resource-link" title="external resource link">external resource link</a> that
4769: contributes to the <a href="semantics.html#styling">styling processing model</a>.</p><p>The specified resource is a resource that describes how to
4770: present the document. Exactly how the resource is to be processed
4771: depends on the actual type of the resource.</p><p>If the <code title="rel-alternate"><a href="#link-type-alternate">alternate</a></code> keyword is
4772: also specified on the <code><a href="semantics.html#the-link-element">link</a></code> element, then <dfn id="the-link-is-an-alternative-stylesheet">the link
4773: is an alternative stylesheet</dfn>; in this case, the <code title="attr-title"><a href="dom.html#the-title-attribute">title</a></code> attribute must be specified on the
4774: <code><a href="semantics.html#the-link-element">link</a></code> element, with a non-empty value.</p><p>The default type for resources given by the <code title="rel-stylesheet"><a href="#link-type-stylesheet">stylesheet</a></code> keyword is <code title="">text/css</code>.</p><div class="impl">
4775:
4776: <p><strong>Quirk</strong>: If the document has been set to
4777: <a href="dom.html#quirks-mode">quirks mode</a> and the <a href="infrastructure.html#content-type" title="Content-Type">Content-Type metadata</a> of the external
4778: resource is not a supported style sheet type, the user agent must
4779: instead assume it to be <code title="">text/css</code>.</p>
4780:
4781: </div><h5 id="link-type-sidebar"><span class="secno">4.12.3.15 </span>Link type "<dfn title="rel-sidebar"><code>sidebar</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-sidebar"><a href="#link-type-sidebar">sidebar</a></code> keyword may be used
4782: with <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4783: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>.</p><p>The <code title="rel-sidebar"><a href="#link-type-sidebar">sidebar</a></code> keyword indicates
4784: that the referenced document, if retrieved, is intended to be shown
4785: in a <a href="browsers.html#secondary-browsing-context">secondary browsing context</a> (if possible), instead
4786: of in the current <a href="browsers.html#browsing-context">browsing context</a>.</p><p>A <a href="#hyperlink" title="hyperlink">hyperlink element</a> with the <code title="rel-sidebar"><a href="#link-type-sidebar">sidebar</a></code> keyword specified is a <dfn id="rel-sidebar-hyperlink" title="rel-sidebar-hyperlink">sidebar hyperlink</dfn>.</p><h5 id="link-type-tag"><span class="secno">4.12.3.16 </span>Link type "<dfn title="rel-tag"><code>tag</code></dfn>"</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-tag"><a href="#link-type-tag">tag</a></code> keyword may be used
4787: with <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4788: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>.</p><p>The <code title="rel-tag"><a href="#link-type-tag">tag</a></code> keyword indicates that the
4789: <em>tag</em> that the referenced document represents applies to the
4790: current document.</p><p class="note">Since it indicates that the tag <em>applies to the
4791: current document</em>, it would be inappropriate to use this keyword
4792: in the markup of a <a href="#tag-cloud">tag cloud</a>, which lists
4793: the popular tag across a set of pages.</p><h5 id="hierarchical-link-types"><span class="secno">4.12.3.17 </span>Hierarchical link types</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>Some documents form part of a hierarchical structure of
4794: documents.</p><p>A hierarchical structure of documents is one where each document
4795: can have various subdocuments. The document of which a document is a
4796: subdocument is said to be the document's <em>parent</em>. A document
4797: with no parent forms the top of the hierarchy.</p><p>A document may be part of multiple hierarchies.</p><h6 id="link-type-index"><span class="secno">4.12.3.17.1 </span>Link type "<dfn title="rel-index"><code>index</code></dfn>"</h6><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-index"><a href="#link-type-index">index</a></code> keyword may be used with
4798: <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4799: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>.</p><p>The <code title="rel-index"><a href="#link-type-index">index</a></code> keyword indicates that
4800: the document is part of a hierarchical structure, and that the link
4801: is leading to the document that is the top of the hierarchy. It
4802: conveys more information when used with the <code title="rel-up"><a href="#link-type-up">up</a></code> keyword (q.v.).</p><div class="impl">
4803:
4804: <p><strong>Synonyms</strong>: For historical reasons, user agents
4805: must also treat the keywords "<code title="">top</code>", "<code title="">contents</code>", and "<code title="">toc</code>" like the
4806: <code title="rel-index"><a href="#link-type-index">index</a></code> keyword.</p>
4807:
4808: </div><h6 id="link-type-up"><span class="secno">4.12.3.17.2 </span>Link type "<dfn title="rel-up"><code>up</code></dfn>"</h6><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-up"><a href="#link-type-up">up</a></code> keyword may be used with
4809: <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4810: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>.</p><p>The <code title="rel-up"><a href="#link-type-up">up</a></code> keyword indicates that the
4811: document is part of a hierarchical structure, and that the link is
4812: leading to a document that is an ancestor of the current
4813: document.</p><p>The <code title="rel-up"><a href="#link-type-up">up</a></code> keyword may be repeated within
4814: a <code title="attr-hyperlink-rel"><a href="#attr-hyperlink-rel">rel</a></code> attribute to indicate
4815: the hierarchical distance from the current document to the
4816: referenced document. If it occurs only once, then the link is
4817: leading to the current document's parent; each additional occurrence
4818: of the keyword represents one further level. If the <code title="rel-index"><a href="#link-type-index">index</a></code> keyword is also present, then the
4819: number of <code title="rel-up"><a href="#link-type-up">up</a></code> keywords is the depth of
4820: the current page relative to the top of the hierarchy. Only one link
4821: is created for the set of one or more <code title="rel-up"><a href="#link-type-up">up</a></code>
4822: keywords and, if present, the <code title="rel-index"><a href="#link-type-index">index</a></code>
4823: keyword.</p><p>If the page is part of multiple hierarchies, then they should be
4824: described in different <a href="embedded-content-0.html#paragraph" title="paragraph">paragraphs</a>. <span class="impl">User agents
4825: must scope any interpretation of the <code title="rel-up"><a href="#link-type-up">up</a></code>
4826: and <code title="rel-index"><a href="#link-type-index">index</a></code> keywords together
4827: indicating the depth of the hierarchy to the <a href="embedded-content-0.html#paragraph">paragraph</a>
4828: in which the link finds itself, if any, or to the document
4829: otherwise.</span></p><div class="impl">
4830:
4831: <p>When two links have both the <code title="rel-up"><a href="#link-type-up">up</a></code> and
4832: <code title="rel-index"><a href="#link-type-index">index</a></code> keywords specified together in
4833: the same scope and contradict each other by having a different
4834: number of <code title="rel-up"><a href="#link-type-up">up</a></code> keywords, the link with the
4835: greater number of <code title="rel-up"><a href="#link-type-up">up</a></code> keywords must be
4836: taken as giving the depth of the document.</p>
4837:
4838: </div><div class="example">
4839:
4840: <p>This can be used to mark up a navigation style sometimes known
4841: as bread crumbs. In the following example, the current page can be
4842: reached via two paths.</p>
4843:
4844: <pre><nav>
4845: <p>
4846: <a href="/" rel="index up up up">Main</a> >
4847: <a href="/products/" rel="up up">Products</a> >
4848: <a href="/products/dishwashers/" rel="up">Dishwashers</a> >
4849: <a>Second hand</a>
4850: </p>
4851: <p>
4852: <a href="/" rel="index up up">Main</a> >
4853: <a href="/second-hand/" rel="up">Second hand</a> >
4854: <a>Dishwashers</a>
4855: </p>
4856: </nav></pre>
4857:
4858: </div><p class="note">The <code title="dom-a-relList"><a href="text-level-semantics.html#dom-a-rellist">relList</a></code> IDL
4859: attribute (e.g. on the <code><a href="text-level-semantics.html#the-a-element">a</a></code> element) does not currently
4860: represent multiple <code title="rel-up"><a href="#link-type-up">up</a></code> keywords (the
4861: interface hides duplicates).</p><h5 id="sequential-link-types"><span class="secno">4.12.3.18 </span>Sequential link types</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>Some documents form part of a sequence of documents.</p><p>A sequence of documents is one where each document can have a
4862: <em>previous sibling</em> and a <em>next sibling</em>. A document
4863: with no previous sibling is the start of its sequence, a document
4864: with no next sibling is the end of its sequence.</p><p>A document may be part of multiple sequences.</p><h6 id="link-type-first"><span class="secno">4.12.3.18.1 </span>Link type "<dfn title="rel-first"><code>first</code></dfn>"</h6><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-first"><a href="#link-type-first">first</a></code> keyword may be used with
4865: <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4866: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>.</p><p>The <code title="rel-first"><a href="#link-type-first">first</a></code> keyword indicates that
4867: the document is part of a sequence, and that the link is leading to
4868: the document that is the first logical document in the sequence.</p><div class="impl">
4869:
4870: <p><strong>Synonyms</strong>: For historical reasons, user agents
4871: must also treat the keywords "<code title="">begin</code>" and
4872: "<code title="">start</code>" like the <code title="rel-first"><a href="#link-type-first">first</a></code> keyword.</p>
4873:
4874: </div><h6 id="link-type-last"><span class="secno">4.12.3.18.2 </span>Link type "<dfn title="rel-last"><code>last</code></dfn>"</h6><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-last"><a href="#link-type-last">last</a></code> keyword may be used with
4875: <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4876: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>.</p><p>The <code title="rel-last"><a href="#link-type-last">last</a></code> keyword indicates that the
4877: document is part of a sequence, and that the link is leading to the
4878: document that is the last logical document in the sequence.</p><div class="impl">
4879:
4880: <p><strong>Synonyms</strong>: For historical reasons, user agents
4881: must also treat the keyword "<code title="">end</code>" like the
4882: <code title="rel-last"><a href="#link-type-last">last</a></code> keyword.</p>
4883:
4884: </div><h6 id="link-type-next"><span class="secno">4.12.3.18.3 </span>Link type "<dfn title="rel-next"><code>next</code></dfn>"</h6><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-next"><a href="#link-type-next">next</a></code> keyword may be used with
4885: <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4886: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>.</p><p>The <code title="rel-next"><a href="#link-type-next">next</a></code> keyword indicates that the
4887: document is part of a sequence, and that the link is leading to the
4888: document that is the next logical document in the sequence.</p><h6 id="link-type-prev"><span class="secno">4.12.3.18.4 </span>Link type "<dfn title="rel-prev"><code>prev</code></dfn>"</h6><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>The <code title="rel-prev"><a href="#link-type-prev">prev</a></code> keyword may be used with
4889: <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code>
4890: elements. For <code><a href="semantics.html#the-link-element">link</a></code> elements, it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink</a>.</p><p>The <code title="rel-prev"><a href="#link-type-prev">prev</a></code> keyword indicates that the
4891: document is part of a sequence, and that the link is leading to the
4892: document that is the previous logical document in the sequence.</p><div class="impl">
4893:
4894: <p><strong>Synonyms</strong>: For historical reasons, user agents
4895: must also treat the keyword "<code title="">previous</code>" like
4896: the <code title="rel-prev"><a href="#link-type-prev">prev</a></code> keyword.</p>
4897:
4898: </div><h5 id="other-link-types"><span class="secno">4.12.3.19 </span>Other link types</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p><dfn id="concept-rel-extensions" title="concept-rel-extensions">Extensions to the predefined
4899: set of link types</dfn> may be registered in the <a href="http://wiki.whatwg.org/wiki/RelExtensions">WHATWG Wiki
4900: RelExtensions page</a>. <a href="references.html#refsWHATWGWIKI">[WHATWGWIKI]</a></p><p>Anyone is free to edit the WHATWG Wiki RelExtensions page at any
4901: time to add a type. Extension types must be specified with the
4902: following information:</p><dl><dt>Keyword</dt>
4903:
4904: <dd>
4905:
4906: <p>The actual value being defined. The value should not be
4907: confusingly similar to any other defined value (e.g. differing
4908: only in case).</p>
4909:
4910: <p>If the value contains a U+003A COLON character (:), it must
4911: also be an <a href="infrastructure.html#absolute-url">absolute URL</a>.</p>
4912:
4913: </dd>
4914:
4915:
4916: <dt>Effect on... <code><a href="semantics.html#the-link-element">link</a></code></dt>
4917:
4918: <dd>
4919:
4920: <p>One of the following:</p>
4921:
4922: <dl><dt>not allowed</dt>
4923:
4924: <dd>The keyword is not allowed to be specified on
4925: <code><a href="semantics.html#the-link-element">link</a></code> elements.</dd>
4926:
4927: <dt>Hyperlink</dt>
4928:
4929: <dd>The keyword may be specified on a <code><a href="semantics.html#the-link-element">link</a></code> element;
4930: it creates a <a href="semantics.html#hyperlink-link" title="hyperlink link">hyperlink
4931: link</a>.</dd>
4932:
4933: <dt>External Resource</dt>
4934:
4935: <dd>The keyword may be specified on a <code><a href="semantics.html#the-link-element">link</a></code> element;
4936: it creates a <a href="semantics.html#external-resource-link" title="external resource link">external
4937: resource link</a>.</dd>
4938:
4939: </dl></dd>
4940:
4941:
4942: <dt>Effect on... <code><a href="text-level-semantics.html#the-a-element">a</a></code> and <code><a href="the-canvas-element.html#the-area-element">area</a></code></dt>
4943:
4944: <dd>
4945:
4946: <p>One of the following:</p>
4947:
4948: <dl><dt>not allowed</dt>
4949:
4950: <dd>The keyword is not allowed to be specified on <code><a href="text-level-semantics.html#the-a-element">a</a></code>
4951: and <code><a href="the-canvas-element.html#the-area-element">area</a></code> elements.</dd>
4952:
4953: <dt>Hyperlink</dt>
4954:
4955: <dd>The keyword may be specified on <code><a href="text-level-semantics.html#the-a-element">a</a></code> and
4956: <code><a href="the-canvas-element.html#the-area-element">area</a></code> elements.</dd>
4957:
4958: </dl></dd>
4959:
4960:
4961: <dt>Brief description</dt>
4962:
4963: <dd><p>A short non-normative description of what the keyword's
4964: meaning is.</p></dd>
4965:
4966:
4967: <dt>Specification</dt>
4968:
4969: <dd><p>A link to a more detailed description of the keyword's
4970: semantics and requirements. It could be another page on the Wiki,
4971: or a link to an external page.</p></dd>
4972:
4973:
4974: <dt>Synonyms</dt>
4975:
4976: <dd><p>A list of other keyword values that have exactly the same
4977: processing requirements. Authors should not use the values defined
4978: to be synonyms, they are only intended to allow user agents to
4979: support legacy content. Anyone may remove synonyms that are not
4980: used in practice; only names that need to be processed as synonyms
4981: for compatibility with legacy content are to be registered in this
4982: way.</p></dd>
4983:
4984:
4985: <dt>Status</dt>
4986:
4987: <dd>
4988:
4989: <p>One of the following:</p>
4990:
4991: <dl><dt>Proposed</dt>
4992:
4993: <dd>The keyword has not received wide peer review and
4994: approval. Someone has proposed it and is, or soon will be, using
4995: it.</dd>
4996:
4997: <dt>Ratified</dt>
4998:
4999: <dd>The keyword has received wide peer review and approval. It
5000: has a specification that unambiguously defines how to handle
5001: pages that use the keyword, including when they use it in
5002: incorrect ways.</dd>
5003:
5004: <dt>Discontinued</dt>
5005:
5006: <dd>The keyword has received wide peer review and it has been
5007: found wanting. Existing pages are using this keyword, but new
5008: pages should avoid it. The "brief description" and
5009: "specification" entries will give details of what authors should
5010: use instead, if anything.</dd>
5011:
5012: </dl><p>If a keyword is found to be redundant with existing values, it
5013: should be removed and listed as a synonym for the existing
5014: value.</p>
5015:
5016: <p>If a keyword is registered in the "proposed" state for a
5017: period of a month or more without being used or specified, then it
5018: may be removed from the registry.</p>
5019:
5020: <p>If a keyword is added with the "proposed" status and found to
5021: be redundant with existing values, it should be removed and listed
5022: as a synonym for the existing value. If a keyword is added with
5023: the "proposed" status and found to be harmful, then it should be
5024: changed to "discontinued" status.</p>
5025:
5026: <p>Anyone can change the status at any time, but should only do so
5027: in accordance with the definitions above.</p>
5028:
5029: </dd>
5030:
5031: </dl><div class="impl">
5032:
5033: <p>Conformance checkers must use the information given on the WHATWG
5034: Wiki RelExtensions page to establish if a value is allowed or not:
5035: values defined in this specification or marked as "proposed" or
5036: "ratified" must be accepted when used on the elements for which they
5037: apply as described in the "Effect on..." field, whereas values
5038: marked as "discontinued" or not listed in either this specification
5039: or on the aforementioned page must be rejected as invalid.
5040: Conformance checkers may cache this information (e.g. for
5041: performance reasons or to avoid the use of unreliable network
5042: connectivity).</p>
5043:
5044: <p>When an author uses a new type not defined by either this
5045: specification or the Wiki page, conformance checkers should offer to
5046: add the value to the Wiki, with the details described above, with
5047: the "proposed" status.</p>
5048:
5049: </div><p>Types defined as extensions in the <a href="http://wiki.whatwg.org/wiki/RelExtensions">WHATWG Wiki
5050: RelExtensions page</a> with the status "proposed" or "ratified" may
5051: be used with the <code title="">rel</code> attribute on
5052: <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="text-level-semantics.html#the-a-element">a</a></code>, and <code><a href="the-canvas-element.html#the-area-element">area</a></code> elements in
1.765 mike 5053: accordance to the "Effect on..." field. <a href="references.html#refsWHATWGWIKI">[WHATWGWIKI]</a></p><h3 id="common-idioms-without-dedicated-elements"><span class="secno">4.13 </span>Common idioms without dedicated elements</h3><p class="XXX annotation"><b>Status: </b><i>Last call for comments. </i><span><a href="http://www.w3.org/html/wg/tracker/issues/89">ISSUE-89</a> (idioms) blocks progress to Last Call</span></p><h4 id="tag-clouds"><span class="secno">4.13.1 </span>Tag clouds</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p id="tag-cloud">This specification does not define any markup
1.299 mike 5054: specifically for marking up lists of keywords that apply to a group
5055: of pages (also known as <i>tag clouds</i>). In general, authors are
5056: encouraged to either mark up such lists using <code><a href="semantics.html#the-ul-element">ul</a></code>
5057: elements with explicit inline counts that are then hidden and turned
5058: into a presentational effect using a style sheet, or to use SVG.</p><div class="example">
5059:
5060: <p>Here, three tags are included in a short tag cloud:</p>
5061:
5062: <pre><style>
5063: @media screen, print, handheld, tv {
5064: /* should be ignored by non-visual browsers */
5065: .tag-cloud > li > span { display: none; }
5066: .tag-cloud > li { display: inline; }
5067: .tag-cloud-1 { font-size: 0.7em; }
5068: .tag-cloud-2 { font-size: 0.9em; }
5069: .tag-cloud-3 { font-size: 1.1em; }
5070: .tag-cloud-4 { font-size: 1.3em; }
5071: .tag-cloud-5 { font-size: 1.5em; }
5072: }
5073: </style>
5074: ...
5075: <ul class="tag-cloud">
5076: <li class="tag-cloud-4"><a title="28 instances" href="/t/apple">apple</a> <span>(popular)</span>
5077: <li class="tag-cloud-2"><a title="6 instances" href="/t/kiwi">kiwi</a> <span>(rare)</span>
5078: <li class="tag-cloud-5"><a title="41 instances" href="/t/pear">pear</a> <span>(very popular)</span>
5079: </ul></pre>
5080:
5081: <p>The actual frequency of each tag is given using the <code title="attr-title"><a href="dom.html#the-title-attribute">title</a></code> attribute. A CSS style sheet is
5082: provided to convert the markup into a cloud of differently-sized
5083: words, but for user agents that do not support CSS or are not
5084: visual, the markup contains annotations like "(popular)" or
5085: "(rare)" to categorize the various tags by frequency, thus enabling
5086: all users to benefit from the information.</p>
5087:
5088: <p>The <code><a href="semantics.html#the-ul-element">ul</a></code> element is used (rather than
1.749 mike 5089: <code><a href="semantics.html#the-ol-element">ol</a></code>) because the order is not particularly important:
1.299 mike 5090: while the list is in fact ordered alphabetically, it would convey
5091: the same information if ordered by, say, the length of the tag.</p>
5092:
1.748 mike 5093: <p>The <code title="rel-tag"><a href="#link-type-tag">tag</a></code> <code title="attr-hyperlink-rel"><a href="#attr-hyperlink-rel">rel</a></code>-keyword is <em>not</em> used
1.299 mike 5094: on these <code><a href="text-level-semantics.html#the-a-element">a</a></code> elements because they do not represent tags
5095: that apply to the page itself; they are just part of an index
5096: listing the tags themselves.</p>
5097:
1.748 mike 5098: </div><h4 id="conversations"><span class="secno">4.13.2 </span>Conversations</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><!-- http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2009-September/022576.html --><p>This specification does not define a specific element for marking
1.299 mike 5099: up conversations, meeting minutes, chat transcripts, dialogues in
5100: screenplays, instant message logs, and other situations where
5101: different players take turns in discourse.</p><p>Instead, authors are encouraged to mark up conversations using
1.303 mike 5102: <code><a href="semantics.html#the-p-element">p</a></code> elements and punctuation. Authors who need to mark
5103: the speaker for styling purposes are encouraged to use
5104: <code><a href="text-level-semantics.html#the-span-element">span</a></code> or <code><a href="text-level-semantics.html#the-b-element">b</a></code>. Paragraphs with their text
5105: wrapped in the <code><a href="text-level-semantics.html#the-i-element">i</a></code> element can be used for marking up
5106: stage directions.</p><div class="example">
1.299 mike 5107:
5108: <p>This example demonstrates this using an extract from Abbot and
5109: Costello's famous sketch, <cite>Who's on first</cite>:</p>
5110:
1.303 mike 5111: <pre><p> Costello: Look, you gotta first baseman?
5112: <p> Abbott: Certainly.
5113: <p> Costello: Who's playing first?
5114: <p> Abbott: That's right.
5115: <p> Costello becomes exasperated.
5116: <p> Costello: When you pay off the first baseman every month, who gets the money?
5117: <p> Abbott: Every dollar of it.</pre>
1.299 mike 5118:
5119: </div><div class="example">
5120:
5121: <p>The following extract shows how an IM conversation log could be
5122: marked up.</p>
5123:
5124: <pre><p> <time>14:22</time> <b>egof</b> I'm not that nerdy, I've only seen 30% of the star trek episodes
5125: <p> <time>14:23</time> <b>kaj</b> if you know what percentage of the star trek episodes you have seen, you are inarguably nerdy
5126: <p> <time>14:23</time> <b>egof</b> it's unarguably
1.303 mike 5127: <p> <time>14:23</time> <i>* kaj blinks</i>
1.299 mike 5128: <p> <time>14:24</time> <b>kaj</b> you are not helping your case</pre>
5129: <!-- with thanks to http://bash.org/?854262 -->
5130:
1.748 mike 5131: </div><h4 id="footnotes"><span class="secno">4.13.3 </span>Footnotes</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><p>HTML does not have a dedicated mechanism for marking up
1.299 mike 5132: footnotes. Here are the recommended alternatives.</p><hr><p>For short inline annotations, the <code title="attr-title"><a href="dom.html#the-title-attribute">title</a></code> attribute should be used.</p><div class="example">
5133:
1.419 mike 5134: <p>In this example, two parts of a dialogue are annotated with
5135: footnote-like content using the <code title="attr-title"><a href="dom.html#the-title-attribute">title</a></code> attribute.</p>
1.299 mike 5136:
5137: <pre><p> <b>Customer</b>: Hello! I wish to register a complaint. Hello. Miss?
1.419 mike 5138: <p> <b>Shopkeeper</b>: <strong><span title="Colloquial pronunciation of 'What do you'"</strong>
1.299 mike 5139: >Watcha</span> mean, miss?
5140: <p> <b>Customer</b>: Uh, I'm sorry, I have a cold. I wish to make a complaint.
1.419 mike 5141: <p> <b>Shopkeeper</b>: Sorry, <span <strong>title="This is, of course, a lie."</strong>>we're
1.299 mike 5142: closing for lunch</span>.</pre>
5143:
5144: </div><hr><p>For longer annotations, the <code><a href="text-level-semantics.html#the-a-element">a</a></code> element should be
5145: used, pointing to an element later in the document. The convention
5146: is that the contents of the link be a number in square brackets.</p><div class="example">
5147:
5148: <p>In this example, a footnote in the dialogue links to a paragraph
5149: below the dialogue. The paragraph then reciprocally links back to the
5150: dialogue, allowing the user to return to the location of the
5151: footnote.</p>
5152:
1.303 mike 5153: <pre><p> Announcer: Number 16: The <i>hand</i>.
5154: <p> Interviewer: Good evening. I have with me in the studio tonight
5155: Mr Norman St John Polevaulter, who for the past few years has been
5156: contradicting people. Mr Polevaulter, why <em>do</em> you
5157: contradict people?
5158: <p> Norman: I don't. <sup><a href="#fn1" id="r1">[1]</a></sup>
5159: <p> Interviewer: You told me you did!
1.299 mike 5160: <em>...</em>
5161: <section>
5162: <p id="fn1"><a href="#r1">[1]</a> This is, naturally, a lie,
5163: but paradoxically if it were true he could not say so without
5164: contradicting the interviewer and thus making it false.</p>
5165: </section></pre>
5166:
5167: </div><hr><p>For side notes, longer annotations that apply to entire sections
5168: of the text rather than just specific words or sentences, the
5169: <code><a href="semantics.html#the-aside-element">aside</a></code> element should be used.</p><div class="example">
5170:
5171: <p>In this example, a sidebar is given after a dialogue, giving it
5172: some context.</p>
5173:
1.303 mike 5174: <pre><p> <span class="speaker">Customer</span>: I will not buy this record, it is scratched.
5175: <p> <span class="speaker">Shopkeeper</span>: I'm sorry?
5176: <p> <span class="speaker">Customer</span>: I will not buy this record, it is scratched.
5177: <p> <span class="speaker">Shopkeeper</span>: No no no, this's'a tobacconist's.
1.299 mike 5178: <aside>
5179: <p>In 1970, the British Empire lay in ruins, and foreign
5180: nationalists frequented the streets — many of them Hungarians
5181: (not the streets — the foreign nationals). Sadly, Alexander
5182: Yalt has been publishing incompetently-written phrase books.
5183: </aside></pre>
5184:
5185: </div><hr><p>For figures or tables, footnotes can be included in the relevant
1.756 mike 5186: <code><a href="semantics.html#the-figcaption-element">figcaption</a></code> or <code><a href="tabular-data.html#the-caption-element">caption</a></code> element, or in
1.729 mike 5187: surrounding prose.</p><div class="example">
1.299 mike 5188:
5189: <p>In this example, a <!-- round --> table has cells with footnotes
1.756 mike 5190: that are given in prose. A <code><a href="semantics.html#the-figure-element">figure</a></code> element is used to
1.299 mike 5191: give a single legend to the combination of the table and its
5192: footnotes.</p>
5193:
5194: <pre><figure>
1.729 mike 5195: <figcaption>Table 1. Alternative activities for knights.</figcaption>
5196: <table>
5197: <tr>
5198: <th> Activity
5199: <th> Location
5200: <th> Cost
5201: <tr>
5202: <td> Dance
5203: <td> Wherever possible
5204: <td> £0<sup><a href="#fn1">1</a></sup>
5205: <tr>
5206: <td> Routines, chorus scenes<sup><a href="#fn2">2</a></sup>
5207: <td> Undisclosed
5208: <td> Undisclosed
5209: <tr>
5210: <td> Dining<sup><a href="#fn3">3</a></sup>
5211: <td> Camelot
5212: <td> Cost of ham, jam, and spam<sup><a href="#fn4">4</a></sup>
5213: </table>
5214: <p id="fn1">1. Assumed.</p>
5215: <p id="fn2">2. Footwork impeccable.</p>
5216: <p id="fn3">3. Quality described as "well".</p>
5217: <p id="fn4">4. A lot.</p>
1.299 mike 5218: </figure></pre>
5219:
1.117 mike 5220: </div><div class="impl">
1.1 mike 5221:
1.748 mike 5222: <h3 id="matching-html-elements-using-selectors"><span class="secno">4.14 </span>Matching HTML elements using selectors</h3><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
1.1 mike 5223:
1.748 mike 5224: <h4 id="selectors"><span class="secno">4.14.1 </span>Case-sensitivity</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
1.718 mike 5225:
5226: <p>Attribute and element <em>names</em> of <a href="infrastructure.html#html-elements">HTML
5227: elements</a> in <a href="dom.html#html-documents">HTML documents</a> must be treated as
5228: <a href="infrastructure.html#ascii-case-insensitive">ASCII case-insensitive</a>.</p>
5229:
5230: <p>Classes from the <code title="attr-class"><a href="dom.html#classes">class</a></code> attribute
5231: of <a href="infrastructure.html#html-elements">HTML elements</a> in documents that are in <a href="dom.html#quirks-mode">quirks
5232: mode</a> must be treated as <a href="infrastructure.html#ascii-case-insensitive">ASCII
5233: case-insensitive</a>.</p>
5234:
5235: <p>Attribute selectors on an <a href="infrastructure.html#html-elements" title="HTML elements">HTML
5236: element</a> in an <a href="dom.html#html-documents" title="HTML documents">HTML
5237: document</a> must treat the <em>values</em> of attributes with
5238: the following names as <a href="infrastructure.html#ascii-case-insensitive">ASCII case-insensitive</a>:</p>
5239:
5240: <!-- based on Mozilla's list, which was itself based on HTML4 -->
5241: <!-- WebKit's was identical at the time of writing except as noted below -->
5242: <ul class="brief"><li><code title="">accept</code>
5243: </li><li><code title="">accept-charset</code>
5244: </li><li><code title="">align</code>
5245: </li><li><code title="">alink</code>
5246: </li><li><code title="">axis</code>
5247: </li><li><code title="">bgcolor</code>
5248: </li><li><code title="">charset</code>
5249: </li><li><code title="">checked</code>
5250: </li><li><code title="">clear</code>
5251: </li><li><code title="">codetype</code>
5252: </li><li><code title="">color</code>
5253: </li><li><code title="">compact</code>
5254: </li><li><code title="">declare</code>
5255: </li><li><code title="">defer</code>
5256: </li><li><code title="">dir</code>
5257: </li><li><code title="">direction</code> <!-- not in webkit -->
5258: </li><li><code title="">disabled</code>
5259: </li><li><code title="">enctype</code>
5260: </li><li><code title="">face</code>
5261: </li><li><code title="">frame</code>
5262: </li><li><code title="">hreflang</code>
5263: </li><li><code title="">http-equiv</code>
5264: </li><li><code title="">lang</code>
5265: </li><li><code title="">language</code>
5266: </li><li><code title="">link</code>
5267: </li><li><code title="">media</code>
5268: </li><li><code title="">method</code>
5269: </li><li><code title="">multiple</code>
5270: </li><li><code title="">nohref</code>
5271: </li><li><code title="">noresize</code>
5272: </li><li><code title="">noshade</code>
5273: </li><li><code title="">nowrap</code>
5274: </li><li><code title="">readonly</code>
5275: </li><li><code title="">rel</code>
5276: </li><li><code title="">rev</code>
5277: </li><li><code title="">rules</code>
5278: </li><li><code title="">scope</code>
5279: </li><li><code title="">scrolling</code>
5280: </li><li><code title="">selected</code>
5281: </li><li><code title="">shape</code>
5282: </li><li><code title="">target</code>
5283: </li><li><code title="">text</code>
5284: </li><li><code title="">type</code>
5285: </li><li><code title="">valign</code>
5286: </li><li><code title="">valuetype</code>
5287: </li><li><code title="">vlink</code>
5288: </li></ul><p>All other attribute values on <a href="infrastructure.html#html-elements">HTML elements</a> must be
5289: treated as <a href="infrastructure.html#case-sensitive">case-sensitive</a>.</p>
5290:
5291:
1.748 mike 5292: <h4 id="pseudo-classes"><span class="secno">4.14.2 </span>Pseudo-classes</h4>
1.718 mike 5293:
1.1 mike 5294: <p>There are a number of dynamic selectors that can be used with
5295: HTML. This section defines when these selectors match HTML
5296: elements.</p>
5297:
5298: <dl><dt><dfn id="selector-link" title="selector-link"><code>:link</code></dfn></dt>
5299: <dt><dfn id="selector-visited" title="selector-visited"><code>:visited</code></dfn></dt>
5300:
5301: <dd>
5302:
1.748 mike 5303: <p>All <code><a href="text-level-semantics.html#the-a-element">a</a></code> elements that have an <code title="attr-hyperlink-href"><a href="#attr-hyperlink-href">href</a></code> attribute, all
5304: <code><a href="the-canvas-element.html#the-area-element">area</a></code> elements that have an <code title="attr-hyperlink-href"><a href="#attr-hyperlink-href">href</a></code> attribute, and all
1.1 mike 5305: <code><a href="semantics.html#the-link-element">link</a></code> elements that have an <code title="attr-link-href"><a href="semantics.html#attr-link-href">href</a></code> attribute, must match one of
5306: <code title="selector-link"><a href="#selector-link">:link</a></code> and <code title="selector-visited"><a href="#selector-visited">:visited</a></code>.</p>
5307:
5308: </dd>
5309:
5310:
5311: <dt><dfn id="selector-active" title="selector-active"><code>:active</code></dfn></dt>
5312:
5313: <dd>
5314:
5315: <p>The <code title="selector-active"><a href="#selector-active">:active</a></code> pseudo-class
5316: must match the following elements between the time the user begins
1.95 mike 5317: to activate the element and the time the user stops activating
1.1 mike 5318: the element:</p>
5319:
1.748 mike 5320: <ul><li><code><a href="text-level-semantics.html#the-a-element">a</a></code> elements that have an <code title="attr-hyperlink-href"><a href="#attr-hyperlink-href">href</a></code> attribute</li>
1.1 mike 5321:
1.748 mike 5322: <li><code><a href="the-canvas-element.html#the-area-element">area</a></code> elements that have an <code title="attr-hyperlink-href"><a href="#attr-hyperlink-href">href</a></code> attribute</li>
1.1 mike 5323:
5324: <li><code><a href="semantics.html#the-link-element">link</a></code> elements that have an <code title="attr-link-href"><a href="semantics.html#attr-link-href">href</a></code> attribute</li>
5325:
5326: <li><code><a href="forms.html#the-button-element">button</a></code> elements that are not <a href="forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a></li>
5327:
5328: <li><code><a href="forms.html#the-input-element">input</a></code> elements whose <code title="attr-input-type"><a href="forms.html#attr-input-type">type</a></code> attribute is in the <a href="forms.html#submit-button-state" title="attr-input-type-submit">Submit Button</a>, <a href="forms.html#image-button-state" title="attr-input-type-image">Image Button</a>, <a href="forms.html#reset-button-state" title="attr-input-type-reset">Reset Button</a>, or <a href="forms.html#button-state" title="attr-input-type-button">Button</a> state</li>
5329:
5330: <li><code><a href="#the-command">command</a></code> elements that do not have a <code title="attr-command-disabled"><a href="#attr-command-disabled">disabled</a></code> attribute</li>
5331:
5332: <li>any other element, if it is <a href="editing.html#specially-focusable">specially
5333: focusable</a></li>
5334:
5335: </ul><p class="example">For example, if the user is using a keyboard to
5336: push a <code><a href="forms.html#the-button-element">button</a></code> element by pressing the space bar, the
5337: element would match this pseudo-class in between the time that the
5338: element received the <code title="event-keydown">keydown</code>
5339: event and the time the element received the <code title="event-keyup">keyup</code> event.</p>
5340:
5341: </dd>
5342:
5343:
5344: <dt><dfn id="selector-enabled" title="selector-enabled"><code>:enabled</code></dfn></dt>
5345:
5346: <dd>
5347:
5348: <p>The <code title="selector-enabled"><a href="#selector-enabled">:enabled</a></code> pseudo-class
5349: must match the following elements:</p>
5350:
1.748 mike 5351: <ul><li><code><a href="text-level-semantics.html#the-a-element">a</a></code> elements that have an <code title="attr-hyperlink-href"><a href="#attr-hyperlink-href">href</a></code> attribute</li>
1.1 mike 5352:
1.748 mike 5353: <li><code><a href="the-canvas-element.html#the-area-element">area</a></code> elements that have an <code title="attr-hyperlink-href"><a href="#attr-hyperlink-href">href</a></code> attribute</li>
1.1 mike 5354:
5355: <li><code><a href="semantics.html#the-link-element">link</a></code> elements that have an <code title="attr-link-href"><a href="semantics.html#attr-link-href">href</a></code> attribute</li>
5356:
5357: <li><code><a href="forms.html#the-button-element">button</a></code> elements that are not <a href="forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a></li>
5358:
5359: <li><code><a href="forms.html#the-input-element">input</a></code> elements whose <code title="attr-input-type"><a href="forms.html#attr-input-type">type</a></code> attribute are not in the
5360: <a href="forms.html#hidden-state" title="attr-input-type-hidden">Hidden</a> state and that
5361: are not <a href="forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a></li>
5362:
5363: <li><code><a href="forms.html#the-select-element">select</a></code> elements that are not <a href="forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a></li>
5364:
5365: <li><code><a href="forms.html#the-textarea-element">textarea</a></code> elements that are not <a href="forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a></li>
5366:
5367: <li><code><a href="forms.html#the-option-element">option</a></code> elements that do not have a <code title="attr-option-disabled"><a href="forms.html#attr-option-disabled">disabled</a></code> attribute</li>
5368:
5369: <li><code><a href="#the-command">command</a></code> elements that do not have a <code title="attr-command-disabled"><a href="#attr-command-disabled">disabled</a></code> attribute</li>
5370:
5371: <li><code><a href="semantics.html#the-li-element">li</a></code> elements that are children of
5372: <code><a href="#menus">menu</a></code> elements, and that have a child element that
5373: defines a <a href="#concept-command" title="concept-command">command</a>, if the
5374: first such element's <a href="#command-facet-disabledstate" title="command-facet-disabledstate">Disabled State</a> facet
5375: is false (not disabled)</li>
5376:
5377: </ul></dd>
5378:
5379:
5380: <dt><dfn id="selector-disabled" title="selector-disabled"><code>:disabled</code></dfn></dt>
5381:
5382: <dd>
5383:
5384: <p>The <code title="selector-disabled"><a href="#selector-disabled">:disabled</a></code>
5385: pseudo-class must match the following elements:</p>
5386:
1.131 mike 5387: <ul><li><code><a href="forms.html#the-button-element">button</a></code> elements that are <a href="forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a></li>
1.1 mike 5388:
5389: <li><code><a href="forms.html#the-input-element">input</a></code> elements whose <code title="attr-input-type"><a href="forms.html#attr-input-type">type</a></code> attribute are not in the
5390: <a href="forms.html#hidden-state" title="attr-input-type-hidden">Hidden</a> state and that
5391: are <a href="forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a></li>
5392:
5393: <li><code><a href="forms.html#the-select-element">select</a></code> elements that are <a href="forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a></li>
5394:
5395: <li><code><a href="forms.html#the-textarea-element">textarea</a></code> elements that are <a href="forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a></li>
5396:
5397: <li><code><a href="forms.html#the-option-element">option</a></code> elements that have a <code title="attr-option-disabled"><a href="forms.html#attr-option-disabled">disabled</a></code> attribute</li>
5398:
5399: <li><code><a href="#the-command">command</a></code> elements that have a <code title="attr-command-disabled"><a href="#attr-command-disabled">disabled</a></code> attribute</li>
5400:
5401: <li><code><a href="semantics.html#the-li-element">li</a></code> elements that are children of
5402: <code><a href="#menus">menu</a></code> elements, and that have a child element that
5403: defines a <a href="#concept-command" title="concept-command">command</a>, if the
5404: first such element's <a href="#command-facet-disabledstate" title="command-facet-disabledstate">Disabled State</a> facet
5405: is true (disabled)</li>
5406:
5407: </ul></dd>
5408:
5409:
5410: <dt><dfn id="selector-checked" title="selector-checked"><code>:checked</code></dfn></dt>
5411:
5412: <dd>
5413:
5414: <p>The <code title="selector-checked"><a href="#selector-checked">:checked</a></code> pseudo-class
5415: must match the following elements:</p>
5416:
5417: <ul><li><code><a href="forms.html#the-input-element">input</a></code> elements whose <code title="attr-input-type"><a href="forms.html#attr-input-type">type</a></code> attribute is in the <a href="forms.html#checkbox-state" title="attr-input-type-checkbox">Checkbox</a> state and whose
5418: <a href="forms.html#concept-fe-checked" title="concept-fe-checked">checkedness</a> state is
5419: true</li>
5420:
5421: <li><code><a href="forms.html#the-input-element">input</a></code> elements whose <code title="attr-input-type"><a href="forms.html#attr-input-type">type</a></code> attribute is in the <a href="forms.html#radio-button-state" title="attr-input-type-radio">Radio Button</a> state and whose
5422: <a href="forms.html#concept-fe-checked" title="concept-fe-checked">checkedness</a> state is
5423: true</li>
5424:
5425: <li><code><a href="#the-command">command</a></code> elements whose <code title="attr-command-type"><a href="#attr-command-type">type</a></code> attribute is in the <a href="#attr-command-type-state-checkbox" title="attr-command-type-state-checkbox">Checkbox</a> state
5426: and that have a <code title="attr-command-checked"><a href="#attr-command-checked">checked</a></code>
5427: attribute</li>
5428:
5429: <li><code><a href="#the-command">command</a></code> elements whose <code title="attr-command-type"><a href="#attr-command-type">type</a></code> attribute is in the <a href="#attr-command-type-state-radio" title="attr-command-type-state-radio">Radio</a> state and that
5430: have a <code title="attr-command-checked"><a href="#attr-command-checked">checked</a></code>
5431: attribute</li>
5432:
5433: </ul></dd>
5434:
5435:
5436: <dt><dfn id="selector-indeterminate" title="selector-indeterminate"><code>:indeterminate</code></dfn></dt>
5437:
5438: <dd>
5439:
5440: <p>The <code title="selector-indeterminate"><a href="#selector-indeterminate">:indeterminate</a></code>
5441: pseudo-class must match <code><a href="forms.html#the-input-element">input</a></code> elements whose <code title="attr-input-type"><a href="forms.html#attr-input-type">type</a></code> attribute is in the <a href="forms.html#checkbox-state" title="attr-input-type-checkbox">Checkbox</a> state and whose
1.186 mike 5442: <code title="dom-input-indeterminate"><a href="forms.html#dom-input-indeterminate">indeterminate</a></code> IDL
1.1 mike 5443: attribute is set to true.</p>
5444:
5445: </dd>
5446:
5447:
5448: <dt><dfn id="selector-default" title="selector-default"><code>:default</code></dfn></dt>
5449:
5450: <dd>
5451:
5452: <p>The <code title="selector-default"><a href="#selector-default">:default</a></code> pseudo-class
5453: must match the following elements:</p>
5454:
5455: <ul><li><code><a href="forms.html#the-button-element">button</a></code> elements that are their form's
5456: <a href="forms.html#default-button">default button</a></li>
5457:
5458: <li><code><a href="forms.html#the-input-element">input</a></code> elements whose <code title="attr-input-type"><a href="forms.html#attr-input-type">type</a></code> attribute is in the <a href="forms.html#submit-button-state" title="attr-input-type-submit">Submit Button</a> or <a href="forms.html#image-button-state" title="attr-input-type-image">Image Button</a> state, and that
5459: are their form's <a href="forms.html#default-button">default button</a></li>
5460: <!--
5461: <li><code>command</code> elements that have a <code
5462: title="attr-command-default">default</code> attribute</li>
5463: -->
5464: </ul></dd>
5465:
5466:
5467: <dt><dfn id="selector-valid" title="selector-valid"><code>:valid</code></dfn></dt>
5468:
5469: <dd>
5470:
5471: <p>The <code title="selector-valid"><a href="#selector-valid">:valid</a></code> pseudo-class
5472: must match all elements that are <a href="forms.html#candidate-for-constraint-validation" title="candidate for
5473: constraint validation">candidates for constraint validation</a>
5474: and that <a href="forms.html#concept-fv-valid" title="concept-fv-valid">satisfy their
5475: constraints</a>.</p>
5476:
5477: </dd>
5478:
5479:
5480: <dt><dfn id="selector-invalid" title="selector-invalid"><code>:invalid</code></dfn></dt>
5481:
5482: <dd>
5483:
5484: <p>The <code title="selector-invalid"><a href="#selector-invalid">:invalid</a></code> pseudo-class
5485: must match all elements that are <a href="forms.html#candidate-for-constraint-validation" title="candidate for
5486: constraint validation">candidates for constraint validation</a>
5487: but that do not <a href="forms.html#concept-fv-valid" title="concept-fv-valid">satisfy their
5488: constraints</a>.</p>
5489:
5490: </dd>
5491:
5492:
5493: <dt><dfn id="selector-in-range" title="selector-in-range"><code>:in-range</code></dfn></dt>
5494:
5495: <dd>
5496:
5497: <p>The <code title="selector-in-range"><a href="#selector-in-range">:in-range</a></code>
5498: pseudo-class must match all elements that are <a href="forms.html#candidate-for-constraint-validation" title="candidate for constraint validation">candidates for
5499: constraint validation</a> and that are neither <a href="forms.html#suffering-from-an-underflow">suffering
5500: from an underflow</a> nor <a href="forms.html#suffering-from-an-overflow">suffering from an
5501: overflow</a>.</p>
5502:
5503: </dd>
5504:
5505:
5506: <dt><dfn id="selector-out-of-range" title="selector-out-of-range"><code>:out-of-range</code></dfn></dt>
5507:
5508: <dd>
5509:
5510: <p>The <code title="selector-out-of-range"><a href="#selector-out-of-range">:out-of-range</a></code>
5511: pseudo-class must match all elements that are <a href="forms.html#candidate-for-constraint-validation" title="candidate for constraint validation">candidates for
5512: constraint validation</a> and that are <a href="forms.html#suffering-from-an-underflow">suffering from an
5513: underflow</a> or <a href="forms.html#suffering-from-an-overflow">suffering from an overflow</a>.</p>
5514:
5515: </dd>
5516:
5517:
5518: <dt><dfn id="selector-required" title="selector-required"><code>:required</code></dfn></dt>
5519:
5520: <dd>
5521:
5522: <p>The <code title="selector-required"><a href="#selector-required">:required</a></code>
5523: pseudo-class must match the following elements:</p>
5524:
5525: <ul><li><code><a href="forms.html#the-input-element">input</a></code> elements that are <i title="concept-input-required"><a href="forms.html#concept-input-required">required</a></i></li>
5526:
5527: <li><code><a href="forms.html#the-textarea-element">textarea</a></code> elements that have a <code title="attr-textarea-required"><a href="forms.html#attr-textarea-required">required</a></code>
5528: attribute</li>
5529:
5530: </ul></dd>
5531:
5532:
5533: <dt><dfn id="selector-optional" title="selector-optional"><code>:optional</code></dfn></dt>
5534:
5535: <dd>
5536:
5537: <p>The <code title="selector-optional"><a href="#selector-optional">:optional</a></code>
5538: pseudo-class must match the following elements:</p>
5539:
5540: <ul><li><code><a href="forms.html#the-button-element">button</a></code> elements</li>
5541:
5542: <li><code><a href="forms.html#the-input-element">input</a></code> elements that are not <i title="concept-input-required"><a href="forms.html#concept-input-required">required</a></i></li>
5543:
5544: <li><code><a href="forms.html#the-select-element">select</a></code> elements</li>
5545:
5546: <li><code><a href="forms.html#the-textarea-element">textarea</a></code> elements that do not have a <code title="attr-textarea-required"><a href="forms.html#attr-textarea-required">required</a></code>
5547: attribute</li>
5548:
5549: </ul></dd>
5550:
5551:
5552: <dt><dfn id="selector-read-only" title="selector-read-only"><code>:read-only</code></dfn></dt>
5553: <dt><dfn id="selector-read-write" title="selector-read-write"><code>:read-write</code></dfn></dt>
5554:
5555: <dd>
5556:
5557: <p>The <code title="selector-read-write"><a href="#selector-read-write">:read-write</a></code>
5558: pseudo-class must match the following elements:</p>
5559:
5560: <ul><li><code><a href="forms.html#the-input-element">input</a></code> elements to which the <code title="attr-input-readonly"><a href="forms.html#attr-input-readonly">readonly</a></code> attribute applies,
5561: but that are not <i title="concept-input-immutable"><a href="forms.html#concept-input-immutable">immutable</a></i>
5562: (i.e. that do not have the <code title="attr-input-readonly"><a href="forms.html#attr-input-readonly">readonly</a></code> attribute specified
5563: and that are not <a href="forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a>)</li>
5564:
5565: <li><code><a href="forms.html#the-textarea-element">textarea</a></code> elements that do not have a <code title="attr-textarea-readonly"><a href="forms.html#attr-textarea-readonly">readonly</a></code> attribute, and
5566: that are not <a href="forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a></li>
5567:
5568: <li>any element that is <a href="editing.html#editable">editable</a></li>
5569:
5570: </ul><p>The <code title="selector-read-only"><a href="#selector-read-only">:read-only</a></code>
5571: pseudo-class must match all other <a href="infrastructure.html#html-elements">HTML elements</a>.</p>
5572:
5573: </dd>
5574:
5575: </dl><p class="note">Another section of this specification defines the
5576: <i><a href="history.html#target-element">target element</a></i> used with the <code title="selector-target">:target</code> pseudo-class.</p>
5577:
5578: <p class="note">This specification does not define when an element
5579: matches the <code title="selector-hover">:hover</code>, <code title="selector-focus">:focus</code>, or <code title="selector-lang()">:lang()</code> dynamic pseudo-classes, as
5580: those are all defined in sufficient detail in a language-agnostic
1.98 mike 5581: fashion in the Selectors specification. <a href="references.html#refsSELECTORS">[SELECTORS]</a></p>
1.1 mike 5582:
1.718 mike 5583: </div><div class="impl">
5584:
1.748 mike 5585: <h3 id="converting-html-to-other-formats"><span class="secno">4.15 </span>Converting HTML to other formats</h3><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p>
1.718 mike 5586:
5587:
1.720 mike 5588:
5589:
1.807 mike 5590: <h4 id="atom"><span class="secno">4.15.1 </span>Atom</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments. </i><span><a href="http://www.w3.org/html/wg/tracker/issues/86">ISSUE-86</a> (atom-id-stability) blocks progress to Last Call</span></p>
1.718 mike 5591:
1.804 mike 5592: <p>Given a <code><a href="infrastructure.html#document">Document</a></code> <var title="">source</var>, a user
1.718 mike 5593: agent may run the following algorithm to <dfn id="extracting-atom" title="extracting
5594: Atom">extract an Atom feed</dfn>. This is not the only algorithm
5595: that can be used for this purpose; for instance, a user agent might
5596: instead use the hAtom algorithm. <a href="references.html#refsHATOM">[HATOM]</a></p>
5597:
1.804 mike 5598: <ol><li><p>If the <code><a href="infrastructure.html#document">Document</a></code> <var title="">source</var> does
1.718 mike 5599: not contain any <code><a href="semantics.html#the-article-element">article</a></code> elements, then return nothing
5600: and abort these steps. This algorithm can only be used with
5601: documents that contain distinct articles.</p>
5602:
5603: </li><li><p>Let <var title="">R</var> be an empty <a href="dom.html#xml-documents" title="XML
1.804 mike 5604: documents">XML</a> <code><a href="infrastructure.html#document">Document</a></code> object whose <a href="dom.html#the-document-s-address" title="the document's address">address</a> is user-agent
1.718 mike 5605: defined.</p></li>
5606:
5607: <li><p>Append a <code title="">feed</code> element in the
5608: <a href="#atom-namespace">Atom namespace</a> to <var title="">R</var>.</p></li>
5609:
5610: <li>
5611:
5612: <p>For each <code><a href="semantics.html#meta">meta</a></code> element with a <code title="attr-meta-name"><a href="semantics.html#attr-meta-name">name</a></code> attribute and a <code title="attr-meta-content"><a href="semantics.html#attr-meta-content">content</a></code> attribute and whose <code title="attr-meta-name"><a href="semantics.html#attr-meta-name">name</a></code> attribute's value is <code title="meta-author"><a href="semantics.html#meta-author">author</a></code>, run the following substeps:</p>
5613:
5614: <ol><li><p>Append an <code title="">author</code> element in the
5615: <a href="#atom-namespace">Atom namespace</a> to the root element of <var title="">R</var>.</p></li>
5616:
5617: <li><p>Append a <code title="">name</code> element in the
5618: <a href="#atom-namespace">Atom namespace</a> to the element created in the
5619: previous step.</p>
5620:
5621: </li><li><p>Append a text node whose data is the value of the
5622: <code><a href="semantics.html#meta">meta</a></code> element's <code title="attr-meta-content"><a href="semantics.html#attr-meta-content">content</a></code> attribute to the element
5623: created in the previous step.</p></li>
5624:
5625: </ol><!-- could use vCards instead, and get <atom:email> and <atom:uri>
5626: elements out of this instead of just <atom:name> --></li>
5627:
5628: <li>
5629:
5630: <p>If there is a <code><a href="semantics.html#the-link-element">link</a></code> element whose <code title="attr-link-rel"><a href="semantics.html#attr-link-rel">rel</a></code> attribute's value includes the
1.748 mike 5631: keyword <code title="rel-icon"><a href="#rel-icon">icon</a></code>, and that element also
1.718 mike 5632: has an <code title="attr-link-href"><a href="semantics.html#attr-link-href">href</a></code> attribute whose
5633: value successfully <a href="infrastructure.html#resolve-a-url" title="resolve a url">resolves</a>
5634: relative to the <code><a href="semantics.html#the-link-element">link</a></code> element, then append an <code title="">icon</code> element in the <a href="#atom-namespace">Atom namespace</a> to
5635: the root element of <var title="">R</var> whose contents is a text
5636: node with its data set to the <a href="infrastructure.html#absolute-url">absolute URL</a> resulting
5637: from <a href="infrastructure.html#resolve-a-url" title="resolve a url">resolving</a> the value of the
5638: <code title="attr-link-href"><a href="semantics.html#attr-link-href">href</a></code> attribute.</p>
5639:
5640: <!-- could check ratio, could check type... -->
5641:
5642: </li>
5643:
5644: <li>
5645:
5646: <p>Append an <code title="">id</code> element in the <a href="#atom-namespace">Atom
5647: namespace</a> to the root element of <var title="">R</var>
5648: whose contents is a text node with its data set to <a href="dom.html#the-document-s-current-address">the
5649: document's current address</a>.</p>
5650:
5651: </li>
5652:
5653: <li>
5654:
5655: <p>Optionally: Let <var title="">x</var> be a <code title="">link</code> element in the <a href="#atom-namespace">Atom
5656: namespace</a>. Add a <code title="">rel</code> attribute whose
5657: value is the string "<code title="">self</code>" to <var title="">x</var>. Append a text node with its data set to the
5658: (user-agent-defined) <a href="dom.html#the-document-s-address" title="the document's
5659: address">address</a> of <var title="">R</var> to <var title="">x</var>. Append <var title="">x</var> to the root element
5660: of <var title="">R</var>.</p>
5661:
5662: <p class="note">This step would be skipped when the document <var title="">R</var> has no convenient <a href="dom.html#the-document-s-address" title="the document's
5663: address">address</a>. The presence of the <code title="">rel="self"</code> link is a "should"-level requirement in
5664: the Atom specification.</p>
5665:
5666: </li>
5667:
5668: <li>
5669:
5670: <p>Let <var title="">x</var> be a <code title="">link</code>
5671: element in the <a href="#atom-namespace">Atom namespace</a>. Add a <code title="">rel</code> attribute whose value is the string "<code title="">alternate</code>" to <var title="">x</var>. If the
5672: document being converted is an <a href="dom.html#html-documents" title="HTML documents">HTML
5673: document</a>, add a <code title="">type</code> attribute whose
5674: value is the string "<code><a href="iana.html#text-html">text/html</a></code>" to <var title="">x</var>. Otherwise, the document being converted is an
5675: <a href="dom.html#xml-documents" title="XML documents">XML document</a>; add a <code title="">type</code> attribute whose value is the string
5676: "<code><a href="iana.html#application-xhtml-xml">application/xhtml+xml</a></code>" to <var title="">x</var>. Append a text node with its data set to
5677: <a href="dom.html#the-document-s-current-address">the document's current address</a> to <var title="">x</var>. Append <var title="">x</var> to the root element
5678: of <var title="">R</var>.</p>
5679:
5680: </li>
5681:
5682: <li><p>Let <var title="">subheading text</var> be the empty
5683: string.</p></li>
5684:
5685: <li><p>Let <var title="">heading</var> be the first element of
5686: <a href="dom.html#heading-content">heading content</a> whose nearest ancestor of
5687: <a href="dom.html#sectioning-content">sectioning content</a> is <a href="dom.html#the-body-element">the body
5688: element</a>, if any, or null if there is none.</p></li>
5689:
5690: <li>
5691:
5692: <p>Take the appropriate action from the following list, as
5693: determined by the type of the <var title="">heading</var>
5694: element:</p>
5695:
5696: <dl><dt>If <var title="">heading</var> is null</dt>
5697:
5698: <dd>
5699:
5700: <p>Let <var title="">heading text</var> be the
1.804 mike 5701: <code><a href="infrastructure.html#textcontent">textContent</a></code> of <a href="dom.html#the-title-element">the <code>title</code>
1.718 mike 5702: element</a>, if there is one, or the empty string
5703: otherwise.</p>
5704:
5705: </dd>
5706:
5707: <dt>If <var title="">heading</var> is a <code><a href="semantics.html#the-hgroup-element">hgroup</a></code> element</dt>
5708:
5709: <dd>
5710:
5711: <p>If <var title="">heading</var> contains no child
5712: <code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h1</a></code>–<code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h6</a></code> elements, let <var title="">heading text</var> be the empty string.</p>
5713:
5714: <p>Otherwise, let <var title="">headings list</var> be a list of
5715: all the <code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h1</a></code>–<code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h6</a></code> element children
5716: of <var title="">heading</var>, sorted first by descending
5717: <a href="semantics.html#rank">rank</a> and then in <a href="infrastructure.html#tree-order">tree order</a> (so
5718: <code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h1</a></code>s first, then <code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h2</a></code>s, etc, with each
1.804 mike 5719: group in the order they appear in the document). Then, let <var title="">heading text</var> be the <code><a href="infrastructure.html#textcontent">textContent</a></code> of
1.718 mike 5720: the first entry in <var title="">headings list</var>, and if
5721: there are multiple entries, let <var title="">subheading
1.804 mike 5722: text</var> be the <code><a href="infrastructure.html#textcontent">textContent</a></code> of the second entry
1.718 mike 5723: in <var title="">headings list</var>.</p>
5724:
5725: </dd>
5726:
5727: <dt>If <var title="">heading</var> is an <code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h1</a></code>–<code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h6</a></code> element</dt>
5728:
5729: <dd>
5730:
5731: <p>Let <var title="">heading text</var> be the
1.804 mike 5732: <code><a href="infrastructure.html#textcontent">textContent</a></code> of <var title="">heading</var>.</p>
1.718 mike 5733:
5734: </dd>
5735:
5736: </dl></li>
5737:
5738: <li>
5739:
5740: <p>Append a <code title="">title</code> element in the <a href="#atom-namespace">Atom
5741: namespace</a> to the root element of <var title="">R</var>
5742: whose contents is a text node with its data set to <var title="">heading text</var>.</p>
5743:
5744: </li>
5745:
5746: <li>
5747:
5748: <p>If <var title="">subheading text</var> is not the empty string,
5749: append a <code title="">subtitle</code> element in the <a href="#atom-namespace">Atom
5750: namespace</a> to the root element of <var title="">R</var>
5751: whose contents is a text node with its data set to <var title="">subheading text</var>.</p>
5752:
5753: </li>
5754:
5755: <li><p>Let <var title="">global update date</var> have no
5756: value.</p></li>
5757:
5758: <li>
5759:
5760: <p>For each <code><a href="semantics.html#the-article-element">article</a></code> element <var title="">article</var> that does not have an ancestor
5761: <code><a href="semantics.html#the-article-element">article</a></code> element, run the following steps:</p>
5762:
5763: <ol><li><p>Let <var title="">E</var> be an <code title="">entry</code> element in the <a href="#atom-namespace">Atom namespace</a>,
5764: and append <var title="">E</var> to the root element of <var title="">R</var>.</p></li>
5765:
5766: <li><p>Let <var title="">heading</var> be the first element of
5767: <a href="dom.html#heading-content">heading content</a> whose nearest ancestor of
5768: <a href="dom.html#sectioning-content">sectioning content</a> is <var title="">article</var>,
5769: if any, or null if there is none.</p></li>
5770:
5771: <li>
5772:
5773: <p>Take the appropriate action from the following list, as
5774: determined by the type of the <var title="">heading</var>
5775: element:</p>
5776:
5777: <dl><dt>If <var title="">heading</var> is null</dt>
5778:
5779: <dd>
5780:
5781: <p>Let <var title="">heading text</var> be the empty
5782: string.</p>
5783:
5784: </dd>
5785:
5786: <dt>If <var title="">heading</var> is a <code><a href="semantics.html#the-hgroup-element">hgroup</a></code> element</dt>
5787:
5788: <dd>
5789:
5790: <p>If <var title="">heading</var> contains no child
5791: <code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h1</a></code>–<code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h6</a></code> elements, let <var title="">heading text</var> be the empty string.</p>
5792:
5793: <p>Otherwise, let <var title="">headings list</var> be a list
5794: of all the <code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h1</a></code>–<code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h6</a></code> element
5795: children of <var title="">heading</var>, sorted first by
5796: descending <a href="semantics.html#rank">rank</a> and then in <a href="infrastructure.html#tree-order">tree
5797: order</a> (so <code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h1</a></code>s first, then
5798: <code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h2</a></code>s, etc, with each group in the order they
5799: appear in the document). Then, let <var title="">heading
1.804 mike 5800: text</var> be the <code><a href="infrastructure.html#textcontent">textContent</a></code> of the first entry
1.718 mike 5801: in <var title="">headings list</var>.</p>
5802:
5803: </dd>
5804:
5805: <dt>If <var title="">heading</var> is an <code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h1</a></code>–<code><a href="semantics.html#the-h1-h2-h3-h4-h5-and-h6-elements">h6</a></code> element</dt>
5806:
5807: <dd>
5808:
5809: <p>Let <var title="">heading text</var> be the
1.804 mike 5810: <code><a href="infrastructure.html#textcontent">textContent</a></code> of <var title="">heading</var>.</p>
1.718 mike 5811:
5812: </dd>
5813:
5814: </dl></li>
5815:
5816: <li>
5817:
5818: <p>Append a <code title="">title</code> element in the
5819: <a href="#atom-namespace">Atom namespace</a> to <var title="">E</var> whose
5820: contents is a text node with its data set to <var title="">heading text</var>.</p>
5821:
5822: </li>
5823:
5824: <!-- <atom:author> is required either at the feed level (above)
5825: or the entry level (here) but we don't provide it -->
5826:
5827: <li>
5828:
5829: <p>Clone <var title="">article</var> and its descendants into an
1.788 mike 5830: environment that has <a href="webappapis.html#concept-bc-noscript" title="concept-bc-noscript">scripting
1.718 mike 5831: disabled</a>, has no <a href="infrastructure.html#plugin" title="plugin">plugins</a>, and
5832: fails any attempt to <a href="infrastructure.html#fetch" title="fetch">fetch</a> any
5833: resources. Let <var title="">cloned article</var> be the
5834: resulting clone <code><a href="semantics.html#the-article-element">article</a></code> element.</p>
5835:
5836: </li>
5837:
5838: <li>
5839:
5840: <p>Remove from the subtree rooted at <var title="">cloned
5841: article</var> any <code><a href="semantics.html#the-article-element">article</a></code> elements other than the
5842: <var title="">cloned article</var> itself, any
5843: <code><a href="semantics.html#the-header-element">header</a></code>, <code><a href="semantics.html#the-footer-element">footer</a></code>, or <code><a href="semantics.html#the-nav-element">nav</a></code>
5844: elements whose nearest ancestor of <a href="dom.html#sectioning-content">sectioning
5845: content</a> is the <var title="">cloned article</var>, and
5846: the first element of <a href="dom.html#heading-content">heading content</a> whose nearest
5847: ancestor of <a href="dom.html#sectioning-content">sectioning content</a> is the <var title="">cloned article</var>, if any.</p>
5848:
5849: </li>
5850:
5851: <li>
5852:
5853: <p>If <var title="">cloned article</var> contains any
5854: <code><a href="text-level-semantics.html#the-ins-element">ins</a></code> or <code><a href="text-level-semantics.html#the-del-element">del</a></code> elements with <code title="attr-mod-datetime"><a href="text-level-semantics.html#attr-mod-datetime">datetime</a></code> attributes whose
5855: values <a href="infrastructure.html#parse-a-global-date-and-time-string" title="parse a global date and time string">parse
5856: as global date and time strings</a> without errors, then let
5857: <var title="">update date</var> be the value of the <code title="attr-mod-datetime"><a href="text-level-semantics.html#attr-mod-datetime">datetime</a></code> attribute that parses
5858: to the newest <a href="infrastructure.html#concept-datetime" title="concept-datetime">global date and
5859: time</a>.</p>
5860:
5861: <p>Otherwise, let <var title="">update date</var> have no
5862: value.</p>
5863:
5864: <p class="note">This value is used below; it is calculated here
5865: because in certain cases the next step mutates the <var title="">cloned article</var>.</p>
5866:
5867: </li>
5868:
5869: <li>
5870:
5871: <p>If the document being converted is an <a href="dom.html#html-documents" title="HTML
5872: documents">HTML document</a>, then: Let <var title="">x</var>
5873: be a <code title="">content</code> element in the <a href="#atom-namespace">Atom
5874: namespace</a>. Add a <code title="">type</code> attribute
5875: whose value is the string "<code title="">html</code>" to <var title="">x</var>. Append a text node with its data set to the
5876: result of running the <a href="syntax.html#html-fragment-serialization-algorithm">HTML fragment serialization
5877: algorithm</a> on <var title="">cloned article</var> to <var title="">x</var>. Append <var title="">x</var> to <var title="">E</var>.</p>
5878:
5879: <p>Otherwise, the document being converted is an <a href="dom.html#xml-documents" title="XML documents">XML document</a>: Let <var title="">x</var> be a <code title="">content</code> element in
5880: the <a href="#atom-namespace">Atom namespace</a>. Add a <code title="">type</code> attribute whose value is the string "<code title="">xml</code>" to <var title="">x</var>. Append a
5881: <code><a href="semantics.html#the-div-element">div</a></code> element to <var title="">x</var>. Move all the
5882: child nodes of the <var title="">cloned article</var> node to
5883: that <code><a href="semantics.html#the-div-element">div</a></code> element, preserving their relative
5884: order. Append <var title="">x</var> to <var title="">E</var>.</p>
5885:
5886: </li>
5887:
5888: <li>
5889:
5890: <p>Establish the value of <var title="">id</var> and <var title="">has-alternate</var> from the first of the following to
5891: apply:</p>
5892:
5893: <dl><dt>If the <var title="">article</var> node has a descendant
1.748 mike 5894: <code><a href="text-level-semantics.html#the-a-element">a</a></code> or <code><a href="the-canvas-element.html#the-area-element">area</a></code> element with an <code title="attr-hyperlink-href"><a href="#attr-hyperlink-href">href</a></code> attribute that
1.718 mike 5895: successfully <a href="infrastructure.html#resolve-a-url" title="resolve a url">resolves</a>
5896: relative to that descendant and a <code title="attr-a-rel">rel</code> attribute whose value includes
1.748 mike 5897: the <code title="rel-bookmark"><a href="#link-type-bookmark">bookmark</a></code> keyword</dt>
1.718 mike 5898:
5899: <dd>Let <var title="">id</var> be the <a href="infrastructure.html#absolute-url">absolute URL</a>
5900: resulting from <a href="infrastructure.html#resolve-a-url" title="resolve a url">resolving</a> the
1.748 mike 5901: value of the <code title="attr-hyperlink-href"><a href="#attr-hyperlink-href">href</a></code>
1.718 mike 5902: attribute of the first such <code><a href="text-level-semantics.html#the-a-element">a</a></code> or <code><a href="the-canvas-element.html#the-area-element">area</a></code>
5903: element, relative to the element. Let <var title="">has-alternate</var> be true.</dd>
5904:
5905: <dt>If the <var title="">article</var> node has an <code title="attr-id"><a href="dom.html#the-id-attribute">id</a></code> attribute</dt>
5906:
5907: <dd>Let <var title="">id</var> be <a href="dom.html#the-document-s-current-address">the document's current
5908: address</a>, with the fragment identifier (if any) removed,
5909: and with a new fragment identifier specified, consisting of the
5910: value of the <var title="">article</var> element's <code title="attr-id"><a href="dom.html#the-id-attribute">id</a></code> attribute. Let <var title="">has-alternate</var> be false.</dd>
5911:
5912: <dt>Otherwise</dt>
5913:
5914: <dd>Let <var title="">id</var> be a user-agent-defined
5915: undereferenceable yet globally unique <a href="infrastructure.html#valid-url" title="valid
5916: URL">valid</a> <a href="infrastructure.html#absolute-url">absolute URL</a>. The same
5917: <a href="infrastructure.html#absolute-url">absolute URL</a> should be generated for each run of
5918: this algorithm when given the same input. Let <var title="">has-alternate</var> be false.</dd>
5919:
5920: </dl></li>
5921:
5922: <li>
5923:
5924: <p>Append an <code title="">id</code> element in the <a href="#atom-namespace">Atom
5925: namespace</a> to <var title="">E</var> whose contents is a
5926: text node with its data set to <var title="">id</var>.</p>
5927:
5928: </li>
5929:
5930: <li>
5931:
5932: <p>If <var title="">has-alternate</var> is true: Let <var title="">x</var> be a <code title="">link</code> element in the
5933: <a href="#atom-namespace">Atom namespace</a>. Add a <code title="">rel</code>
5934: attribute whose value is the string "<code title="">alternate</code>" to <var title="">x</var>. Append a
5935: text node with its data set to <var title="">id</var> to <var title="">x</var>. Append <var title="">x</var> to <var title="">E</var>.</p>
5936:
5937: </li>
5938:
5939: <li>
5940:
5941: <p>If <var title="">article</var> has a <code><a href="text-level-semantics.html#the-time-element">time</a></code>
5942: element descendant that has a <code title="attr-time-pubdate"><a href="text-level-semantics.html#attr-time-pubdate">pubdate</a></code> attribute and whose
5943: nearest ancestor <code><a href="semantics.html#the-article-element">article</a></code> element is <var title="">article</var>, and the first such element's <a href="text-level-semantics.html#concept-time-date" title="concept-time-date">date</a> is not unknown, then run
5944: the following substeps, with <var title="">e</var> being the
5945: first such element:</p>
5946:
5947: <ol><li><p>Let <var title="">datetime</var> be a <a href="infrastructure.html#concept-datetime" title="concept-datetime">global date and time</a> whose date
5948: component is the <a href="text-level-semantics.html#concept-time-date" title="concept-time-date">date</a> of
5949: <var title="">e</var>.</p></li>
5950:
5951: <li><p>If <var title="">e</var>'s <a href="text-level-semantics.html#concept-time-time" title="concept-time-time">time</a> and <a href="text-level-semantics.html#concept-time-timezone" title="concept-time-timezone">time-zone offset</a> are not
5952: unknown, then let <var title="">datetime</var>'s time and
5953: time-zone offset components be the <a href="text-level-semantics.html#concept-time-time" title="concept-time-time">time</a> and <a href="text-level-semantics.html#concept-time-timezone" title="concept-time-timezone">time-zone offset</a> of <var title="">e</var>. Otherwise, let them be midnight and no offset
5954: respectively ("<code title="">00:00Z</code>").</p></li>
5955:
5956: <li><p>Let <var title="">publication date</var> be the
5957: <a href="infrastructure.html#best-representation-of-the-global-date-and-time-string">best representation of the global date and time
5958: string</a> <var title="">datetime</var>.</p></li>
5959:
5960: </ol><p>Otherwise, let <var title="">publication date</var> have no
5961: value.</p>
5962:
5963: </li>
5964:
5965: <li>
5966:
5967: <p>If <var title="">update date</var> has no value but <var title="">publication date</var> does, then let <var title="">update date</var> have the value of <var title="">publication date</var>.</p>
5968:
5969: <p>Otherwise, if <var title="">publication date</var> has no
5970: value but <var title="">update date</var> does, then let <var title="">publication date</var> have the value of <var title="">update date</var>.</p>
5971:
5972: </li>
5973:
5974: <li>
5975:
5976: <p>If <var title="">update date</var> has a value, and <var title="">global update date</var> has no value or is less recent
5977: than <var title="">update date</var>, then let <var title="">global update date</var> have the value of <var title="">update date</var>.</p>
5978:
5979: </li>
5980:
5981: <li>
5982:
5983: <p>If <var title="">publication date</var> and <var title="">update date</var> both still have no value, then let
5984: them both value a value that is a <a href="infrastructure.html#valid-global-date-and-time-string">valid global date and
5985: time string</a> representing the <a href="infrastructure.html#concept-datetime" title="concept-datetime">global date and time</a> of the
5986: moment that this algorithm was invoked.</p>
5987:
5988: </li>
5989:
5990: <li>
5991:
5992: <p>Append an <code title="">published</code> element in the
5993: <a href="#atom-namespace">Atom namespace</a> to <var title="">E</var> whose
5994: contents is a text node with its data set to <var title="">publication date</var>.</p>
5995:
5996: </li>
5997:
5998: <li>
5999:
6000: <p>Append an <code title="">updated</code> element in the
6001: <a href="#atom-namespace">Atom namespace</a> to <var title="">E</var> whose
6002: contents is a text node with its data set to <var title="">update date</var>.</p>
6003:
6004: </li>
6005:
6006: </ol></li>
6007:
6008: <li>
6009:
6010: <p>If <var title="">global update date</var> has no value, then
6011: let it have a value that is a <a href="infrastructure.html#valid-global-date-and-time-string">valid global date and time
6012: string</a> representing the <a href="infrastructure.html#concept-datetime" title="concept-datetime">global date and time</a> of the date
1.804 mike 6013: and time of the <code><a href="infrastructure.html#document">Document</a></code>'s source file's last
1.718 mike 6014: modification, if it is known, or else of the moment that this
6015: algorithm was invoked.</p>
6016:
6017: </li>
6018:
6019: <li>
6020:
6021: <p>Insert an <code title="">updated</code> element in the
6022: <a href="#atom-namespace">Atom namespace</a> into the root element of <var title="">R</var> before the first <code title="">entry</code> in
6023: the <a href="#atom-namespace">Atom namespace</a> whose contents is a text node with
6024: its data set to <var title="">global update date</var>.</p>
6025:
6026: </li>
6027:
6028: <li><p>Return the Atom document <var title="">R</var>.</p></li>
6029:
6030: </ol><p class="note">The above algorithm does not guarantee that the
6031: output will be a conforming Atom feed. In particular, if
6032: insufficient information is provided in the document (e.g. if the
6033: document does not have any <code title=""><meta name="author"
6034: content="..."></code> elements), then the output will not be
6035: conforming.</p>
6036:
6037: <p>The <dfn id="atom-namespace">Atom namespace</dfn> is: <code>http://www.w3.org/2005/Atom</code></p>
6038:
6039:
6040:
1.117 mike 6041: </div></body></html>
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