Annotation of html5/spec/the-source-element.html, revision 1.1
1.1 ! mike 1: <!DOCTYPE html>
! 2: <html lang="en-US-x-Hixie"><head><title>4.8.8 The source element — HTML5</title><style type="text/css">
! 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: i, em { font-style: italic; }
! 22: dt dfn { font-style: italic; }
! 23: pre, code { font-size: inherit; font-family: monospace; font-variant: normal; }
! 24: pre strong { color: black; font: inherit; font-weight: bold; background: yellow; }
! 25: pre em { font-weight: bolder; font-style: normal; }
! 26: @media screen { code { color: orangered; } code :link, code :visited { color: inherit; } }
! 27: var sub { vertical-align: bottom; font-size: smaller; position: relative; top: 0.1em; }
! 28: table { border-collapse: collapse; border-style: hidden hidden none hidden; }
! 29: table thead, table tbody { border-bottom: solid; }
! 30: table tbody th:first-child { border-left: solid; }
! 31: table tbody th { text-align: left; }
! 32: table td, table th { border-left: solid; border-right: solid; border-bottom: solid thin; vertical-align: top; padding: 0.2em; }
! 33: blockquote { margin: 0 0 0 2em; border: 0; padding: 0; font-style: italic; }
! 34:
! 35: .bad, .bad *:not(.XXX) { color: gray; border-color: gray; background: transparent; }
! 36: .matrix, .matrix td { border: none; text-align: right; }
! 37: .matrix { margin-left: 2em; }
! 38: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
! 39: .dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
! 40: .dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
! 41:
! 42: .toc dfn, h1 dfn, h2 dfn, h3 dfn, h4 dfn, h5 dfn, h6 dfn { font: inherit; }
! 43: img.extra, p.overview { float: right; }
! 44: pre.idl { border: solid thin; background: #EEEEEE; color: black; padding: 0.5em 1em; position: relative; }
! 45: pre.idl :link, pre.idl :visited { color: inherit; background: transparent; }
! 46: pre.idl::before { content: "IDL"; font: bold small sans-serif; padding: 0.5em; background: white; position: absolute; top: 0; margin: -1px 0 0 -4em; width: 1.5em; border: thin solid; border-radius: 0 0 0 0.5em }
! 47: pre.css { border: solid thin; background: #FFFFEE; color: black; padding: 0.5em 1em; }
! 48: pre.css:first-line { color: #AAAA50; }
! 49: dl.domintro { color: green; margin: 2em 0 2em 2em; padding: 0.5em 1em; border: none; background: #DDFFDD; }
! 50: hr + dl.domintro, div.impl + dl.domintro { margin-top: 2.5em; margin-bottom: 1.5em; }
! 51: dl.domintro dt, dl.domintro dt * { color: black; text-decoration: none; }
! 52: dl.domintro dd { margin: 0.5em 0 1em 2em; padding: 0; }
! 53: dl.domintro dd p { margin: 0.5em 0; }
! 54: dl.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: black; font-style: italic; border: solid 2px; background: white; padding: 0 0.25em; }
! 55: dl.switch { padding-left: 2em; }
! 56: dl.switch > dt { text-indent: -1.5em; }
! 57: dl.switch > dt:before { content: '\21AA'; padding: 0 0.5em 0 0; display: inline-block; width: 1em; text-align: right; line-height: 0.5em; }
! 58: dl.triple { padding: 0 0 0 1em; }
! 59: dl.triple dt, dl.triple dd { margin: 0; display: inline }
! 60: dl.triple dt:after { content: ':'; }
! 61: dl.triple dd:after { content: '\A'; white-space: pre; }
! 62: .diff-old { text-decoration: line-through; color: silver; background: transparent; }
! 63: .diff-chg, .diff-new { text-decoration: underline; color: green; background: transparent; }
! 64: a .diff-new { border-bottom: 1px blue solid; }
! 65:
! 66: h2 { page-break-before: always; }
! 67: h1, h2, h3, h4, h5, h6 { page-break-after: avoid; }
! 68: h1 + h2, hr + h2.no-toc { page-break-before: auto; }
! 69:
! 70: p > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]),
! 71: li > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]), { border-bottom: solid #9999CC; }
! 72:
! 73: div.head { margin: 0 0 1em; padding: 1em 0 0 0; }
! 74: div.head p { margin: 0; }
! 75: div.head h1 { margin: 0; }
! 76: div.head .logo { float: right; margin: 0 1em; }
! 77: div.head .logo img { border: none } /* remove border from top image */
! 78: div.head dl { margin: 1em 0; }
! 79: div.head p.copyright, div.head p.alt { font-size: x-small; font-style: oblique; margin: 0; }
! 80:
! 81: body > .toc > li { margin-top: 1em; margin-bottom: 1em; }
! 82: body > .toc.brief > li { margin-top: 0.35em; margin-bottom: 0.35em; }
! 83: body > .toc > li > * { margin-bottom: 0.5em; }
! 84: body > .toc > li > * > li > * { margin-bottom: 0.25em; }
! 85: .toc, .toc li { list-style: none; }
! 86:
! 87: .brief { margin-top: 1em; margin-bottom: 1em; line-height: 1.1; }
! 88: .brief li { margin: 0; padding: 0; }
! 89: .brief li p { margin: 0; padding: 0; }
! 90:
! 91: .category-list { margin-top: -0.75em; margin-bottom: 1em; line-height: 1.5; }
! 92: .category-list::before { content: '\21D2\A0'; font-size: 1.2em; font-weight: 900; }
! 93: .category-list li { display: inline; }
! 94: .category-list li:not(:last-child)::after { content: ', '; }
! 95: .category-list li > span, .category-list li > a { text-transform: lowercase; }
! 96: .category-list li * { text-transform: none; } /* don't affect <code> nested in <a> */
! 97:
! 98: .XXX { color: #E50000; background: white; border: solid red; padding: 0.5em; margin: 1em 0; }
! 99: .XXX > :first-child { margin-top: 0; }
! 100: p .XXX { line-height: 3em; }
! 101: .annotation { border: solid thin black; background: #0C479D; color: white; position: relative; margin: 8px 0 20px 0; }
! 102: .annotation:before { position: absolute; left: 0; top: 0; width: 100%; height: 100%; margin: 6px -6px -6px 6px; background: #333333; z-index: -1; content: ''; }
! 103: .annotation :link, .annotation :visited { color: inherit; }
! 104: .annotation :link:hover, .annotation :visited:hover { background: transparent; }
! 105: .annotation span { border: none ! important; }
! 106: .note { color: green; background: transparent; font-family: sans-serif; }
! 107: .warning { color: red; background: transparent; }
! 108: .note, .warning { font-weight: bolder; font-style: italic; }
! 109: .note em, .warning em, .note i, .warning i { font-style: normal; }
! 110: p.note, div.note { padding: 0.5em 2em; }
! 111: span.note { padding: 0 2em; }
! 112: .note p:first-child, .warning p:first-child { margin-top: 0; }
! 113: .note p:last-child, .warning p:last-child { margin-bottom: 0; }
! 114: .warning:before { font-style: normal; }
! 115: p.note:before { content: 'Note: '; }
! 116: p.warning:before { content: '\26A0 Warning! '; }
! 117:
! 118: .bookkeeping:before { display: block; content: 'Bookkeeping details'; font-weight: bolder; font-style: italic; }
! 119: .bookkeeping { font-size: 0.8em; margin: 2em 0; }
! 120: .bookkeeping p { margin: 0.5em 2em; display: list-item; list-style: square; }
! 121: .bookkeeping dt { margin: 0.5em 2em 0; }
! 122: .bookkeeping dd { margin: 0 3em 0.5em; }
! 123:
! 124: h4 { position: relative; z-index: 3; }
! 125: h4 + .element, h4 + div + .element { margin-top: -2.5em; padding-top: 2em; }
! 126: .element {
! 127: background: #EEEEFF;
! 128: color: black;
! 129: margin: 0 0 1em 0.15em;
! 130: padding: 0 1em 0.25em 0.75em;
! 131: border-left: solid #9999FF 0.25em;
! 132: position: relative;
! 133: z-index: 1;
! 134: }
! 135: .element:before {
! 136: position: absolute;
! 137: z-index: 2;
! 138: top: 0;
! 139: left: -1.15em;
! 140: height: 2em;
! 141: width: 0.9em;
! 142: background: #EEEEFF;
! 143: content: ' ';
! 144: border-style: none none solid solid;
! 145: border-color: #9999FF;
! 146: border-width: 0.25em;
! 147: }
! 148:
! 149: .example { display: block; color: #222222; background: #FCFCFC; border-left: double; margin-left: 2em; padding-left: 1em; }
! 150: td > .example:only-child { margin: 0 0 0 0.1em; }
! 151:
! 152: ul.domTree, ul.domTree ul { padding: 0 0 0 1em; margin: 0; }
! 153: ul.domTree li { padding: 0; margin: 0; list-style: none; position: relative; }
! 154: ul.domTree li li { list-style: none; }
! 155: 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; }
! 156: 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; }
! 157: ul.domTree span { font-style: italic; font-family: serif; }
! 158: ul.domTree .t1 code { color: purple; font-weight: bold; }
! 159: ul.domTree .t2 { font-style: normal; font-family: monospace; }
! 160: ul.domTree .t2 .name { color: black; font-weight: bold; }
! 161: ul.domTree .t2 .value { color: blue; font-weight: normal; }
! 162: ul.domTree .t3 code, .domTree .t4 code, .domTree .t5 code { color: gray; }
! 163: ul.domTree .t7 code, .domTree .t8 code { color: green; }
! 164: ul.domTree .t10 code { color: teal; }
! 165:
! 166: body.dfnEnabled dfn { cursor: pointer; }
! 167: .dfnPanel {
! 168: display: inline;
! 169: position: absolute;
! 170: z-index: 10;
! 171: height: auto;
! 172: width: auto;
! 173: padding: 0.5em 0.75em;
! 174: font: small sans-serif, Droid Sans Fallback;
! 175: background: #DDDDDD;
! 176: color: black;
! 177: border: outset 0.2em;
! 178: }
! 179: .dfnPanel * { margin: 0; padding: 0; font: inherit; text-indent: 0; }
! 180: .dfnPanel :link, .dfnPanel :visited { color: black; }
! 181: .dfnPanel p { font-weight: bolder; }
! 182: .dfnPanel * + p { margin-top: 0.25em; }
! 183: .dfnPanel li { list-style-position: inside; }
! 184:
! 185: #configUI { position: absolute; z-index: 20; top: 10em; right: 1em; width: 11em; font-size: small; }
! 186: #configUI p { margin: 0.5em 0; padding: 0.3em; background: #EEEEEE; color: black; border: inset thin; }
! 187: #configUI p label { display: block; }
! 188: #configUI #updateUI, #configUI .loginUI { text-align: center; }
! 189: #configUI input[type=button] { display: block; margin: auto; }
! 190:
! 191: fieldset { margin: 1em; padding: 0.5em 1em; }
! 192: fieldset > legend + * { margin-top: 0; }
! 193: fieldset > :last-child { margin-bottom: 0; }
! 194: fieldset p { margin: 0.5em 0; }
! 195:
! 196: </style><link href="http://www.w3.org/StyleSheets/TR/W3C-ED" rel="stylesheet" type="text/css"><style type="text/css">
! 197:
! 198: .applies thead th > * { display: block; }
! 199: .applies thead code { display: block; }
! 200: .applies tbody th { whitespace: nowrap; }
! 201: .applies td { text-align: center; }
! 202: .applies .yes { background: yellow; }
! 203:
! 204: .matrix, .matrix td { border: hidden; text-align: right; }
! 205: .matrix { margin-left: 2em; }
! 206:
! 207: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
! 208: .dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
! 209: .dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
! 210:
! 211: td.eg { border-width: thin; text-align: center; }
! 212:
! 213: #table-example-1 { border: solid thin; border-collapse: collapse; margin-left: 3em; }
! 214: #table-example-1 * { font-family: "Essays1743", serif; line-height: 1.01em; }
! 215: #table-example-1 caption { padding-bottom: 0.5em; }
! 216: #table-example-1 thead, #table-example-1 tbody { border: none; }
! 217: #table-example-1 th, #table-example-1 td { border: solid thin; }
! 218: #table-example-1 th { font-weight: normal; }
! 219: #table-example-1 td { border-style: none solid; vertical-align: top; }
! 220: #table-example-1 th { padding: 0.5em; vertical-align: middle; text-align: center; }
! 221: #table-example-1 tbody tr:first-child td { padding-top: 0.5em; }
! 222: #table-example-1 tbody tr:last-child td { padding-bottom: 1.5em; }
! 223: #table-example-1 tbody td:first-child { padding-left: 2.5em; padding-right: 0; width: 9em; }
! 224: #table-example-1 tbody td:first-child::after { content: leader(". "); }
! 225: #table-example-1 tbody td { padding-left: 2em; padding-right: 2em; }
! 226: #table-example-1 tbody td:first-child + td { width: 10em; }
! 227: #table-example-1 tbody td:first-child + td ~ td { width: 2.5em; }
! 228: #table-example-1 tbody td:first-child + td + td + td ~ td { width: 1.25em; }
! 229:
! 230: .apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
! 231: .apple-table-examples * { font-family: "Times", serif; }
! 232: .apple-table-examples td, .apple-table-examples th { border: none; white-space: nowrap; padding-top: 0; padding-bottom: 0; }
! 233: .apple-table-examples tbody th:first-child { border-left: none; width: 100%; }
! 234: .apple-table-examples thead th:first-child ~ th { font-size: smaller; font-weight: bolder; border-bottom: solid 2px; text-align: center; }
! 235: .apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
! 236: .apple-table-examples tbody th, .apple-table-examples tfoot th { font: inherit; text-align: left; }
! 237: .apple-table-examples td { text-align: right; vertical-align: top; }
! 238: .apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
! 239: .apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
! 240: .apple-table-examples.e2 th[scope=row] { padding-left: 1em; }
! 241: .apple-table-examples sup { line-height: 0; }
! 242:
! 243: .details-example img { vertical-align: top; }
! 244:
! 245: #base64-table {
! 246: white-space: nowrap;
! 247: font-size: 0.6em;
! 248: column-width: 6em;
! 249: column-count: 5;
! 250: column-gap: 1em;
! 251: -moz-column-width: 6em;
! 252: -moz-column-count: 5;
! 253: -moz-column-gap: 1em;
! 254: -webkit-column-width: 6em;
! 255: -webkit-column-count: 5;
! 256: -webkit-column-gap: 1em;
! 257: }
! 258: #base64-table thead { display: none; }
! 259: #base64-table * { border: none; }
! 260: #base64-table tbody td:first-child:after { content: ':'; }
! 261: #base64-table tbody td:last-child { text-align: right; }
! 262:
! 263: #named-character-references-table {
! 264: white-space: nowrap;
! 265: font-size: 0.6em;
! 266: column-width: 30em;
! 267: column-gap: 1em;
! 268: -moz-column-width: 30em;
! 269: -moz-column-gap: 1em;
! 270: -webkit-column-width: 30em;
! 271: -webkit-column-gap: 1em;
! 272: }
! 273: #named-character-references-table > table > tbody > tr > td:first-child + td,
! 274: #named-character-references-table > table > tbody > tr > td:last-child { text-align: center; }
! 275: #named-character-references-table > table > tbody > tr > td:last-child:hover > span { position: absolute; top: auto; left: auto; margin-left: 0.5em; line-height: 1.2; font-size: 5em; border: outset; padding: 0.25em 0.5em; background: white; width: 1.25em; height: auto; text-align: center; }
! 276: #named-character-references-table > table > tbody > tr#entity-CounterClockwiseContourIntegral > td:first-child { font-size: 0.5em; }
! 277:
! 278: .glyph.control { color: red; }
! 279:
! 280: @font-face {
! 281: font-family: 'Essays1743';
! 282: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743.ttf');
! 283: }
! 284: @font-face {
! 285: font-family: 'Essays1743';
! 286: font-weight: bold;
! 287: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Bold.ttf');
! 288: }
! 289: @font-face {
! 290: font-family: 'Essays1743';
! 291: font-style: italic;
! 292: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Italic.ttf');
! 293: }
! 294: @font-face {
! 295: font-family: 'Essays1743';
! 296: font-style: italic;
! 297: font-weight: bold;
! 298: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-BoldItalic.ttf');
! 299: }
! 300:
! 301: </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%20.domintro:before%20%7B%20background:%20%23FFEEEE;%20%7D" id="highlight" rel="alternate stylesheet" title="Highlight implementation requirements"><script type="text/javascript">
! 302: function getCookie(name) {
! 303: var params = location.search.substr(1).split("&");
! 304: for (var index = 0; index < params.length; index++) {
! 305: if (params[index] == name)
! 306: return "1";
! 307: var data = params[index].split("=");
! 308: if (data[0] == name)
! 309: return unescape(data[1]);
! 310: }
! 311: var cookies = document.cookie.split("; ");
! 312: for (var index = 0; index < cookies.length; index++) {
! 313: var data = cookies[index].split("=");
! 314: if (data[0] == name)
! 315: return unescape(data[1]);
! 316: }
! 317: return null;
! 318: }
! 319: </script>
! 320: <script src="link-fixup.js"></script>
! 321: <link href="the-audio-element.html" title="4.8.7 The audio element" rel="prev">
! 322: <link href="index.html#contents" title="Table of contents" rel="contents">
! 323: <link href="the-track-element.html" title="4.8.9 The track element" rel="next">
! 324: </head><body class="split chapter"><div class="head" id="head">
! 325: <p><a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a></p>
! 326:
! 327: <h1>HTML5</h1>
! 328: <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><p>This is revision 1.5469.</p>
! 329:
! 330: <h2 class="no-num no-toc" id="editor-s-draft-9-december-2011">Editor's Draft 9 December 2011</h2>
! 331: </div><nav class="prev_next">
! 332: <a href="the-audio-element.html">← 4.8.7 The audio element</a> –
! 333: <a href="index.html#contents">Table of contents</a> –
! 334: <a href="the-track-element.html">4.8.9 The track element →</a>
! 335: </nav>
! 336:
! 337: <h4 id="the-source-element"><span class="secno">4.8.8 </span>The <dfn><code>source</code></dfn> element</h4><dl class="element"><dt>Categories</dt>
! 338: <dd>None.</dd>
! 339: <dt>Contexts in which this element can be used:</dt>
! 340: <dd>As a child of a <a href="media-elements.html#media-element">media element</a>, before any <a href="content-models.html#flow-content">flow content</a>
! 341: or <code><a href="the-track-element.html#the-track-element">track</a></code> elements.</dd>
! 342: <dt>Content model:</dt>
! 343: <dd>Empty.</dd>
! 344: <dt>Content attributes:</dt>
! 345: <dd><a href="global-attributes.html#global-attributes">Global attributes</a></dd>
! 346: <dd><code title="attr-source-src"><a href="#attr-source-src">src</a></code></dd>
! 347: <dd><code title="attr-source-type"><a href="#attr-source-type">type</a></code></dd>
! 348: <dd><code title="attr-source-media"><a href="#attr-source-media">media</a></code></dd>
! 349: <dt>DOM interface:</dt>
! 350: <dd>
! 351: <pre class="idl">interface <dfn id="htmlsourceelement">HTMLSourceElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
! 352: attribute DOMString <a href="#dom-source-src" title="dom-source-src">src</a>;
! 353: attribute DOMString <a href="#dom-source-type" title="dom-source-type">type</a>;
! 354: attribute DOMString <a href="#dom-source-media" title="dom-source-media">media</a>;
! 355: };</pre>
! 356: </dd>
! 357: </dl><p>The <code><a href="#the-source-element">source</a></code> element allows authors to specify
! 358: multiple alternative <a href="media-elements.html#media-resource" title="media resource">media
! 359: resources</a> for <a href="media-elements.html#media-element" title="media element">media
! 360: elements</a>. It does not <a href="rendering.html#represents" title="represents">represent</a> anything on its own.</p><p>The <dfn id="attr-source-src" title="attr-source-src"><code>src</code></dfn> attribute
! 361: gives the address of the <a href="media-elements.html#media-resource">media resource</a>. The value must
! 362: be a <a href="urls.html#valid-non-empty-url-potentially-surrounded-by-spaces">valid non-empty URL potentially surrounded by
! 363: spaces</a>. This attribute must be present.</p><p class="note">Dynamically modifying a <code><a href="#the-source-element">source</a></code> element
! 364: and its attribute when the element is already inserted in a
! 365: <code><a href="the-video-element.html#the-video-element">video</a></code> or <code><a href="the-audio-element.html#the-audio-element">audio</a></code> element will have no
! 366: effect. To change what is playing, just use the <code title="attr-media-src"><a href="media-elements.html#attr-media-src">src</a></code> attribute on the <a href="media-elements.html#media-element">media
! 367: element</a> directly, possibly making use of the <code title="dom-navigator-canPlayType"><a href="media-elements.html#dom-navigator-canplaytype">canPlayType()</a></code> method to
! 368: pick from amongst available resources. Generally, manipulating
! 369: <code><a href="#the-source-element">source</a></code> elements manually after the document has been
! 370: parsed is an unncessarily complicated approach.</p><p>The <dfn id="attr-source-type" title="attr-source-type"><code>type</code></dfn>
! 371: attribute gives the type of the <a href="media-elements.html#media-resource">media resource</a>, to help
! 372: the user agent determine if it can play this <a href="media-elements.html#media-resource">media
! 373: resource</a> before fetching it. If specified, its value must be
! 374: a <a href="infrastructure.html#valid-mime-type">valid MIME type</a>. The <code title="">codecs</code>
! 375: parameter, which certain MIME types define, might be necessary to
! 376: specify exactly how the resource is encoded. <a href="references.html#refsRFC4281">[RFC4281]</a></p><div class="example">
! 377:
! 378: <p>The following list shows some examples of how to use the <code title="">codecs=</code> MIME parameter in the <code title="attr-source-type"><a href="#attr-source-type">type</a></code> attribute.</p>
! 379:
! 380: <dl><dt>H.264 Constrained baseline profile video (main and extended video compatible) level 3 and Low-Complexity AAC audio in MP4 container</dt>
! 381: <dd><pre><source src='video.mp4' type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'></pre></dd>
! 382:
! 383: <dt>H.264 Extended profile video (baseline-compatible) level 3 and Low-Complexity AAC audio in MP4 container</dt>
! 384: <dd><pre><source src='video.mp4' type='video/mp4; codecs="avc1.58A01E, mp4a.40.2"'></pre></dd>
! 385:
! 386: <dt>H.264 Main profile video level 3 and Low-Complexity AAC audio in MP4 container</dt>
! 387: <dd><pre><source src='video.mp4' type='video/mp4; codecs="avc1.4D401E, mp4a.40.2"'></pre></dd>
! 388:
! 389: <dt>H.264 'High' profile video (incompatible with main, baseline, or extended profiles) level 3 and Low-Complexity AAC audio in MP4 container</dt>
! 390: <dd><pre><source src='video.mp4' type='video/mp4; codecs="avc1.64001E, mp4a.40.2"'></pre></dd>
! 391:
! 392:
! 393: <dt>MPEG-4 Visual Simple Profile Level 0 video and Low-Complexity AAC audio in MP4 container</dt>
! 394: <dd><pre><source src='video.mp4' type='video/mp4; codecs="mp4v.20.8, mp4a.40.2"'></pre></dd>
! 395:
! 396: <dt>MPEG-4 Advanced Simple Profile Level 0 video and Low-Complexity AAC audio in MP4 container</dt>
! 397: <dd><pre><source src='video.mp4' type='video/mp4; codecs="mp4v.20.240, mp4a.40.2"'></pre></dd>
! 398:
! 399: <dt>MPEG-4 Visual Simple Profile Level 0 video and AMR audio in 3GPP container</dt>
! 400: <dd><pre><source src='video.3gp' type='video/3gpp; codecs="mp4v.20.8, samr"'></pre></dd>
! 401:
! 402:
! 403: <dt>Theora video and Vorbis audio in Ogg container</dt>
! 404: <dd><pre><source src='video.ogv' type='video/ogg; codecs="theora, vorbis"'></pre></dd>
! 405:
! 406: <dt>Theora video and Speex audio in Ogg container</dt>
! 407: <dd><pre><source src='video.ogv' type='video/ogg; codecs="theora, speex"'></pre></dd>
! 408:
! 409: <dt>Vorbis audio alone in Ogg container</dt>
! 410: <dd><pre><source src='audio.ogg' type='audio/ogg; codecs=vorbis'></pre></dd>
! 411:
! 412: <dt>Speex audio alone in Ogg container</dt>
! 413: <dd><pre><source src='audio.spx' type='audio/ogg; codecs=speex'></pre></dd>
! 414:
! 415: <dt>FLAC audio alone in Ogg container</dt>
! 416: <dd><pre><source src='audio.oga' type='audio/ogg; codecs=flac'></pre></dd>
! 417:
! 418: <dt>Dirac video and Vorbis audio in Ogg container</dt>
! 419: <dd><pre><source src='video.ogv' type='video/ogg; codecs="dirac, vorbis"'></pre></dd>
! 420:
! 421:
! 422:
! 423:
! 424:
! 425:
! 426: </dl></div><p>The <dfn id="attr-source-media" title="attr-source-media"><code>media</code></dfn>
! 427: attribute gives the intended media type of the <a href="media-elements.html#media-resource">media
! 428: resource</a>, to help the user agent determine if this
! 429: <a href="media-elements.html#media-resource">media resource</a> is useful to the user before fetching
! 430: it. Its value must be a <a href="common-microsyntaxes.html#valid-media-query">valid media query</a>.</p><p id="source-default-media">The default, if the <code title="attr-srouce-media">media</code> attribute is omitted, is
! 431: "<code title="">all</code>", meaning that by default the <a href="media-elements.html#media-resource">media
! 432: resource</a> is suitable for all media.</p><div class="impl">
! 433:
! 434: <p>If a <code><a href="#the-source-element">source</a></code> element is inserted as a child of a
! 435: <a href="media-elements.html#media-element">media element</a> that has no <code title="attr-media-src"><a href="media-elements.html#attr-media-src">src</a></code> attribute and whose <code title="dom-media-networkState"><a href="media-elements.html#dom-media-networkstate">networkState</a></code> has the value
! 436: <code title="dom-media-NETWORK_EMPTY"><a href="media-elements.html#dom-media-network_empty">NETWORK_EMPTY</a></code>, the user
! 437: agent must invoke the <a href="media-elements.html#media-element">media element</a>'s <a href="media-elements.html#concept-media-load-algorithm" title="concept-media-load-algorithm">resource selection
! 438: algorithm</a>.</p>
! 439:
! 440: <p>The IDL attributes <dfn id="dom-source-src" title="dom-source-src"><code>src</code></dfn>, <dfn id="dom-source-type" title="dom-source-type"><code>type</code></dfn>, and <dfn id="dom-source-media" title="dom-source-media"><code>media</code></dfn> must
! 441: <a href="common-dom-interfaces.html#reflect">reflect</a> the respective content attributes of the same
! 442: name.</p>
! 443:
! 444: </div><div class="example">
! 445:
! 446: <p>If the author isn't sure if the user agents will all be able to
! 447: render the media resources provided, the author can listen to the
! 448: <code title="event-error">error</code> event on the last
! 449: <code><a href="#the-source-element">source</a></code> element and trigger fallback behavior:</p>
! 450:
! 451: <pre><script>
! 452: function fallback(video) {
! 453: // replace <video> with its contents
! 454: while (video.hasChildNodes()) {
! 455: if (video.firstChild instanceof HTMLSourceElement)
! 456: video.removeChild(video.firstChild);
! 457: else
! 458: video.parentNode.insertBefore(video.firstChild, video);
! 459: }
! 460: video.parentNode.removeChild(video);
! 461: }
! 462: </script>
! 463: <video controls autoplay>
! 464: <source src='video.mp4' type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
! 465: <source src='video.ogv' type='video/ogg; codecs="theora, vorbis"'
! 466: onerror="fallback(parentNode)">
! 467: ...
! 468: </video></pre>
! 469:
! 470: </div></body></html>
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