Annotation of html5/spec-author-view/scripting-1.html, revision 1.308
1.293 mike 1: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"><!-- when publishing, change bits marked ZZZ --><html class="split chapter" lang="en-US-x-Hixie"><meta content="text/html; charset=ascii" http-equiv="Content-Type"><title>4.3 Scripting — HTML5 (Edition for Web Authors)</title><meta content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0;" name="viewport"><meta content="IE=edge,chrome=1" http-equiv="X-UA-Compatible"><link href="whatwg.css" rel="stylesheet"><style type="text/css">
1.9 mike 2: pre { margin-left: 2em; white-space: pre-wrap; }
3: h2 { margin: 3em 0 1em 0; }
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26: table { border-collapse: collapse; border-style: hidden hidden none hidden; }
1.32 mike 27: table thead, table tbody { border-bottom: solid; }
1.9 mike 28: table tbody th:first-child { border-left: solid; }
29: table tbody th { text-align: left; }
30: table td, table th { border-left: solid; border-right: solid; border-bottom: solid thin; vertical-align: top; padding: 0.2em; }
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32:
33: .bad, .bad *:not(.XXX) { color: gray; border-color: gray; background: transparent; }
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35: .matrix { margin-left: 2em; }
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39:
40: .toc dfn, h1 dfn, h2 dfn, h3 dfn, h4 dfn, h5 dfn, h6 dfn { font: inherit; }
41: img.extra { float: right; }
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44: pre.css { border: solid thin; background: #FFFFEE; color: black; padding: 0.5em 1em; }
45: pre.css:first-line { color: #AAAA50; }
1.17 mike 46: dl.domintro { color: green; margin: 2em 0 2em 2em; padding: 0.5em 1em; border: none; background: #DDFFDD; }
1.9 mike 47: hr + dl.domintro, div.impl + dl.domintro { margin-top: 2.5em; margin-bottom: 1.5em; }
48: dl.domintro dt, dl.domintro dt * { color: black; text-decoration: none; }
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50: dl.domintro dd p { margin: 0.5em 0; }
51: dl.switch { padding-left: 2em; }
52: dl.switch > dt { text-indent: -1.5em; }
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58: .diff-old { text-decoration: line-through; color: silver; background: transparent; }
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60: a .diff-new { border-bottom: 1px blue solid; }
61:
62: h2 { page-break-before: always; }
63: h1, h2, h3, h4, h5, h6 { page-break-after: avoid; }
64: h1 + h2, hr + h2.no-toc { page-break-before: auto; }
65:
1.303 mike 66: p > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]),
67: li > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]), { border-bottom: solid #9999CC; }
1.9 mike 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; }
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76:
77: body > .toc > li { margin-top: 1em; margin-bottom: 1em; }
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81: .toc, .toc li { list-style: none; }
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83: .brief { margin-top: 1em; margin-bottom: 1em; line-height: 1.1; }
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85: .brief li p { margin: 0; padding: 0; }
86:
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90: .category-list li:not(:last-child)::after { content: ', '; }
91: .category-list li > span, .category-list li > a { text-transform: lowercase; }
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93:
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1.130 mike 116: .bookkeeping dt { margin: 0.5em 2em 0; }
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1.9 mike 118:
119: h4 { position: relative; z-index: 3; }
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146:
147: ul.domTree, ul.domTree ul { padding: 0 0 0 1em; margin: 0; }
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149: ul.domTree li li { list-style: none; }
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159: ul.domTree .t10 code { color: teal; }
160:
1.13 mike 161: body.dfnEnabled dfn { cursor: pointer; }
162: .dfnPanel {
163: display: inline;
164: position: absolute;
165: z-index: 10;
166: height: auto;
167: width: auto;
168: padding: 0.5em 0.75em;
169: font: small sans-serif, Droid Sans Fallback;
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176: .dfnPanel p { font-weight: bolder; }
177: .dfnPanel * + p { margin-top: 0.25em; }
178: .dfnPanel li { list-style-position: inside; }
179:
1.9 mike 180: #configUI { position: absolute; z-index: 20; top: 10em; right: 1em; width: 11em; font-size: small; }
181: #configUI p { margin: 0.5em 0; padding: 0.3em; background: #EEEEEE; color: black; border: inset thin; }
182: #configUI p label { display: block; }
183: #configUI #updateUI, #configUI .loginUI { text-align: center; }
184: #configUI input[type=button] { display: block; margin: auto; }
1.119 mike 185:
1.290 mike 186: fieldset { margin: 1em; }
187: fieldset > legend * + { margin-top: 0; }
188: fieldset > :last-child { margin-bottom: 0; }
189:
1.9 mike 190: </style><style type="text/css">
191:
192: .applies thead th > * { display: block; }
193: .applies thead code { display: block; }
194: .applies tbody th { whitespace: nowrap; }
195: .applies td { text-align: center; }
196: .applies .yes { background: yellow; }
197:
1.134 mike 198: .matrix, .matrix td { border: hidden; text-align: right; }
1.9 mike 199: .matrix { margin-left: 2em; }
200:
201: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
202: .dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
203: .dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
204:
1.210 mike 205: td.eg { border-width: thin; text-align: center; }
206:
1.9 mike 207: #table-example-1 { border: solid thin; border-collapse: collapse; margin-left: 3em; }
208: #table-example-1 * { font-family: "Essays1743", serif; line-height: 1.01em; }
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211: #table-example-1 th, #table-example-1 td { border: solid thin; }
212: #table-example-1 th { font-weight: normal; }
213: #table-example-1 td { border-style: none solid; vertical-align: top; }
214: #table-example-1 th { padding: 0.5em; vertical-align: middle; text-align: center; }
215: #table-example-1 tbody tr:first-child td { padding-top: 0.5em; }
216: #table-example-1 tbody tr:last-child td { padding-bottom: 1.5em; }
217: #table-example-1 tbody td:first-child { padding-left: 2.5em; padding-right: 0; width: 9em; }
218: #table-example-1 tbody td:first-child::after { content: leader(". "); }
219: #table-example-1 tbody td { padding-left: 2em; padding-right: 2em; }
220: #table-example-1 tbody td:first-child + td { width: 10em; }
221: #table-example-1 tbody td:first-child + td ~ td { width: 2.5em; }
222: #table-example-1 tbody td:first-child + td + td + td ~ td { width: 1.25em; }
223:
224: .apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
225: .apple-table-examples * { font-family: "Times", serif; }
226: .apple-table-examples td, .apple-table-examples th { border: none; white-space: nowrap; padding-top: 0; padding-bottom: 0; }
227: .apple-table-examples tbody th:first-child { border-left: none; width: 100%; }
228: .apple-table-examples thead th:first-child ~ th { font-size: smaller; font-weight: bolder; border-bottom: solid 2px; text-align: center; }
229: .apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
230: .apple-table-examples tbody th, .apple-table-examples tfoot th { font: inherit; text-align: left; }
231: .apple-table-examples td { text-align: right; vertical-align: top; }
232: .apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
1.11 mike 233: .apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
234: .apple-table-examples.e2 th[scope=row] { padding-left: 1em; }
235: .apple-table-examples sup { line-height: 0; }
236:
1.12 mike 237: .details-example img { vertical-align: top; }
238:
1.22 mike 239: #named-character-references-table {
1.254 mike 240: white-space: nowrap;
1.22 mike 241: font-size: 0.6em;
1.254 mike 242: column-width: 30em;
1.22 mike 243: column-gap: 1em;
1.254 mike 244: -moz-column-width: 30em;
1.22 mike 245: -moz-column-gap: 1em;
1.254 mike 246: -webkit-column-width: 30em;
1.22 mike 247: -webkit-column-gap: 1em;
248: }
1.254 mike 249: #named-character-references-table > table > tbody > tr > td:first-child + td,
1.22 mike 250: #named-character-references-table > table > tbody > tr > td:last-child { text-align: center; }
251: #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; }
1.254 mike 252: #named-character-references-table > table > tbody > tr#entity-CounterClockwiseContourIntegral > td:first-child { font-size: 0.5em; }
1.22 mike 253:
1.33 mike 254: .glyph.control { color: red; }
255:
1.36 mike 256: @font-face {
257: font-family: 'Essays1743';
258: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743.ttf');
259: }
260: @font-face {
261: font-family: 'Essays1743';
262: font-weight: bold;
263: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Bold.ttf');
264: }
265: @font-face {
266: font-family: 'Essays1743';
267: font-style: italic;
268: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Italic.ttf');
269: }
270: @font-face {
271: font-family: 'Essays1743';
272: font-style: italic;
273: font-weight: bold;
274: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-BoldItalic.ttf');
275: }
276:
1.21 mike 277: </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">
1.155 mike 278: function getCookie(name) {
279: var params = location.search.substr(1).split("&");
280: for (var index = 0; index < params.length; index++) {
281: if (params[index] == name)
282: return "1";
283: var data = params[index].split("=");
284: if (data[0] == name)
285: return unescape(data[1]);
1.11 mike 286: }
1.155 mike 287: var cookies = document.cookie.split("; ");
288: for (var index = 0; index < cookies.length; index++) {
289: var data = cookies[index].split("=");
290: if (data[0] == name)
291: return unescape(data[1]);
1.11 mike 292: }
1.155 mike 293: return null;
294: }
295: function load(script) {
296: var e = document.createElement('script');
297: e.setAttribute('src', script + '?' + encodeURIComponent(location) + '&' + encodeURIComponent(document.referrer));
298: document.body.appendChild(e);
299: }
300: function init() {
301: if (location.search == '?slow-browser')
302: return;
303: var configUI = document.createElement('div');
304: configUI.id = 'configUI';
305: document.body.appendChild(configUI);
306: if (document.getElementById('head'))
307: load('toc.js');
308: load('dfn.js');
309: if (getCookie('profile') == '1')
310: document.getElementsByTagName('h2')[0].textContent += '; load: ' + (new Date() - loadTimer) + 'ms';
311: fixBrokenLink();
312: }
1.306 mike 313: </script><link href="http://www.w3.org/StyleSheets/TR/W3C-ED" rel="stylesheet" type="text/css"><link href="style.css" rel="stylesheet"><script src="link-fixup.js"></script><link href="semantics.html" rel="prev" title="4 The elements of HTML">
1.158 mike 314: <link href="Overview.html#contents" rel="index" title="Table of contents">
315: <link href="sections.html" rel="next" title="4.4 Sections">
316: <body onload="fixBrokenLink(); init()"><div class="head" id="head">
1.11 mike 317: <p><a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a></p>
1.34 mike 318:
1.308 ! mike 319: <h1>HTML5 <span class="edition">Edition for Web Authors</span> <span class="rcsrevision">revision 1.4517</span></h1>
1.11 mike 320: </div><div>
1.158 mike 321: <a href="semantics.html">← 4 The elements of HTML</a> –
322: <a href="Overview.html#contents">Table of contents</a> –
323: <a href="sections.html">4.4 Sections →</a>
1.11 mike 324: <ol class="toc"><li><ol><li><a href="scripting-1.html#scripting-1"><span class="secno">4.3 </span>Scripting</a>
1.154 mike 325: <ol><li><a href="scripting-1.html#script" id="x4.3.1-the-script-element"><span class="secno">4.3.1 </span>The <code>script</code> element</a>
1.158 mike 326: <ol><li><a href="scripting-1.html#scriptingLanguages"><span class="secno">4.3.1.1 </span>Scripting languages</a><li><a href="scripting-1.html#restrictions-for-contents-of-script-elements" id="x4.3.1.2-restrictions-for-contents-of-script-elements"><span class="secno">4.3.1.2 </span>Restrictions for contents of <code>script</code> elements</a><li><a href="scripting-1.html#inline-documentation-for-external-scripts" id="x4.3.1.3-inline-documentation-for-external-scripts"><span class="secno">4.3.1.3 </span>Inline documentation for external scripts</a></ol><li><a href="scripting-1.html#the-noscript-element" id="x4.3.2-the-noscript-element"><span class="secno">4.3.2 </span>The <code>noscript</code> element</a></ol></ol></ol></div>
1.11 mike 327:
1.199 mike 328: <h3 id="scripting-1"><span class="secno">4.3 </span>Scripting</h3><p>Scripts allow authors to add interactivity to their documents.<p>Authors are encouraged to use declarative alternatives to
1.11 mike 329: scripting where possible, as declarative mechanisms are often more
1.158 mike 330: maintainable, and many users disable scripting.<div class="example">
1.11 mike 331: <p>For example, instead of using script to show or hide a section
1.174 mike 332: to show more details, the <code><a href="interactive-elements.html#the-details-element" id="details-3">details</a></code> element could be
1.11 mike 333: used.</p>
334: </div><p>Authors are also encouraged to make their applications degrade
1.158 mike 335: gracefully in the absence of scripting support.<div class="example">
1.11 mike 336: <p>For example, if an author provides a link in a table header to
337: dynamically resort the table, the link could also be made to
338: function without scripts by requesting the sorted table from the
339: server.</p>
1.199 mike 340: </div><h4 id="script"><span class="secno">4.3.1 </span>The <dfn><code>script</code></dfn> element</h4><dl class="element"><dt>Categories</dt>
1.154 mike 341: <dd><a href="content-models.html#metadata-content" id="metadata-content-13">Metadata content</a>.</dd>
1.200 mike 342: <dd><a href="content-models.html#flow-content" id="flow-content-12">Flow content</a>.</dd>
343: <dd><a href="content-models.html#phrasing-content" id="phrasing-content-16">Phrasing content</a>.</dd>
344: <dt>Contexts in which this element can be used:</dt>
1.154 mike 345: <dd>Where <a href="content-models.html#metadata-content" id="metadata-content-14">metadata content</a> is expected.</dd>
1.200 mike 346: <dd>Where <a href="content-models.html#phrasing-content" id="phrasing-content-17">phrasing content</a> is expected.</dd>
1.11 mike 347: <dt>Content model:</dt>
1.154 mike 348: <dd>If there is no <code title="attr-script-src"><a href="#attr-script-src" id="src-1">src</a></code>
1.184 mike 349: attribute, depends on the value of the <code title="attr-script-type"><a href="#attr-script-type" id="type-6">type</a></code> attribute, but must match
1.154 mike 350: <a href="#restrictions-for-contents-of-script-elements" id="script-content-restrictions">script content restrictions</a>.</dd>
351: <dd>If there <em>is</em> a <code title="attr-script-src"><a href="#attr-script-src" id="src-2">src</a></code>
1.11 mike 352: attribute, the element must be either empty or contain only
1.154 mike 353: <a href="#inline-documentation-for-external-scripts" id="script-documentation">script documentation</a> that also matches <a href="#restrictions-for-contents-of-script-elements" id="script-content-restrictions-0">script
1.11 mike 354: content restrictions</a>.</dd>
355: <dt>Content attributes:</dt>
1.154 mike 356: <dd><a href="elements.html#global-attributes" id="global-attributes-7">Global attributes</a></dd>
357: <dd><code title="attr-script-src"><a href="#attr-script-src" id="src-3">src</a></code></dd>
358: <dd><code title="attr-script-async"><a href="#attr-script-async" id="async">async</a></code></dd>
359: <dd><code title="attr-script-defer"><a href="#attr-script-defer" id="defer">defer</a></code></dd>
1.184 mike 360: <dd><code title="attr-script-type"><a href="#attr-script-type" id="type-7">type</a></code></dd>
1.154 mike 361: <dd><code title="attr-script-charset"><a href="#attr-script-charset" id="charset-10">charset</a></code></dd>
1.11 mike 362: <dt>DOM interface:</dt>
363: <dd>
1.154 mike 364: <pre class="idl">interface <dfn id="htmlscriptelement">HTMLScriptElement</dfn> : <a href="elements.html#htmlelement" id="htmlelement-14">HTMLElement</a> {
1.160 mike 365: attribute DOMString <a class="full-spec-link" href="http://dev.w3.org/html5/spec/scripting-1.html#dom-script-src" title='Read about this "src" reference in the full HTML5 spec.'>src</a>;
366: attribute boolean <a class="full-spec-link" href="http://dev.w3.org/html5/spec/scripting-1.html#dom-script-async" title='Read about this "async" reference in the full HTML5 spec.'>async</a>;
367: attribute boolean <a class="full-spec-link" href="http://dev.w3.org/html5/spec/scripting-1.html#dom-script-defer" title='Read about this "defer" reference in the full HTML5 spec.'>defer</a>;
368: attribute DOMString <a class="full-spec-link" href="http://dev.w3.org/html5/spec/scripting-1.html#dom-script-type" title='Read about this "type" reference in the full HTML5 spec.'>type</a>;
369: attribute DOMString <a class="full-spec-link" href="http://dev.w3.org/html5/spec/scripting-1.html#dom-script-charset" title='Read about this "charset" reference in the full HTML5 spec.'>charset</a>;
370: attribute DOMString <a class="full-spec-link" href="http://dev.w3.org/html5/spec/scripting-1.html#dom-script-text" title='Read about this "text" reference in the full HTML5 spec.'>text</a>;
1.11 mike 371: };</pre>
372: </dd>
1.289 mike 373: </dl><p>The <code><a href="#script" id="script-13">script</a></code> element allows authors to include dynamic
1.11 mike 374: script and data blocks in their documents. The element does not
1.160 mike 375: <a class="full-spec-link" href="http://dev.w3.org/html5/spec/rendering.html#represents" title='Read about this "represent" reference in the full HTML5 spec.'>represent</a> content for the user.<p>When used to include dynamic scripts, the scripts may either be
1.11 mike 376: embedded inline or may be imported from an external file using the
1.154 mike 377: <code title="attr-script-src"><a href="#attr-script-src" id="src-4">src</a></code> attribute. If the language
1.11 mike 378: is not that described by "<code title="">text/javascript</code>",
1.184 mike 379: then the <code title="attr-script-type"><a href="#attr-script-type" id="type-8">type</a></code> attribute must
1.158 mike 380: be present, as described below.<p>When used to include data blocks (as opposed to scripts), the
1.22 mike 381: data must be embedded inline, the format of the data must be given
1.184 mike 382: using the <code title="attr-script-type"><a href="#attr-script-type" id="type-9">type</a></code> attribute, and
1.154 mike 383: the <code title="attr-script-src"><a href="#attr-script-src" id="src-5">src</a></code> attribute must not be
1.158 mike 384: specified.<p>The <dfn id="attr-script-type" title="attr-script-type"><code>type</code></dfn>
1.11 mike 385: attribute gives the language of the script or format of the data. If
1.154 mike 386: the attribute is present, its value must be a <a href="infrastructure.html#valid-mime-type" id="valid-mime-type-3">valid MIME
1.12 mike 387: type</a>. The <code title="">charset</code> parameter must not be
1.14 mike 388: specified. The default, which is used if the attribute is absent,
1.158 mike 389: is "<code title="">text/javascript</code>".<p>The <dfn id="attr-script-src" title="attr-script-src"><code>src</code></dfn>
1.11 mike 390: attribute, if specified, gives the address of the external script
1.154 mike 391: resource to use. The value of the attribute must be a <a href="urls.html#valid-non-empty-url-potentially-surrounded-by-spaces" id="valid-non-empty-url-potentially-surrounded-by-spaces-2">valid
1.31 mike 392: non-empty URL potentially surrounded by spaces</a> identifying a
1.184 mike 393: script resource of the type given by the <code title="attr-script-type"><a href="#attr-script-type" id="type-10">type</a></code> attribute, if the attribute is
1.31 mike 394: present, or of the type "<code title="">text/javascript</code>", if
395: the attribute is absent. A resource is a script resource of a given
396: type if that type identifies a scripting language and the resource
1.158 mike 397: conforms with the requirements of that language's specification.<p>The <dfn id="attr-script-charset" title="attr-script-charset"><code>charset</code></dfn>
1.11 mike 398: attribute gives the character encoding of the external script
1.154 mike 399: resource. The attribute must not be specified if the <code title="attr-script-src"><a href="#attr-script-src" id="src-6">src</a></code> attribute is not present. If the
1.11 mike 400: attribute is set, its value must be a valid character encoding name,
1.165 mike 401: must be an <a href="infrastructure.html#ascii-case-insensitive" id="ascii-case-insensitive-10">ASCII case-insensitive</a> match for the
1.154 mike 402: <a href="infrastructure.html#preferred-mime-name" id="preferred-mime-name-1">preferred MIME name</a> for that encoding, and must match
1.11 mike 403: the encoding given in the <code title="">charset</code> parameter of
1.160 mike 404: the <a class="full-spec-link" href="http://dev.w3.org/html5/spec/fetching-resources.html#content-type" title='Read about this "Content-Type metadata" reference in the full HTML5 spec.'>Content-Type metadata</a> of the
1.158 mike 405: external file, if any. <a href="references.html#refsIANACHARSET">[IANACHARSET]</a><p>The <dfn id="attr-script-async" title="attr-script-async"><code>async</code></dfn> and
1.11 mike 406: <dfn id="attr-script-defer" title="attr-script-defer"><code>defer</code></dfn> attributes
1.154 mike 407: are <a href="common-microsyntaxes.html#boolean-attribute" id="boolean-attribute-1" title="boolean attribute">boolean attributes</a> that
408: indicate how the script should be executed. The <code title="attr-script-defer"><a href="#attr-script-defer" id="defer-0">defer</a></code> and <code title="attr-script-async"><a href="#attr-script-async" id="async-0">async</a></code> attributes must not be
409: specified if the <code title="attr-script-src"><a href="#attr-script-src" id="src-7">src</a></code> attribute
1.158 mike 410: is not present.<p>There are three possible modes that can be selected using these
1.154 mike 411: attributes. If the <code title="attr-script-async"><a href="#attr-script-async" id="async-1">async</a></code>
1.11 mike 412: attribute is present, then the script will be executed
1.154 mike 413: asynchronously, as soon as it is available. If the <code title="attr-script-async"><a href="#attr-script-async" id="async-2">async</a></code> attribute is not present but
414: the <code title="attr-script-defer"><a href="#attr-script-defer" id="defer-1">defer</a></code> attribute is
1.11 mike 415: present, then the script is executed when the page has finished
416: parsing. If neither attribute is present, then the script is
417: fetched and executed immediately, before the user agent continues
1.158 mike 418: parsing the page.<p class="note">The exact processing details for these attributes
1.20 mike 419: are, for mostly historical reasons, somewhat non-trivial, involving
420: a number of aspects of HTML. The implementation requirements are
421: therefore by necessity scattered throughout the specification. The
422: algorithms below (in this section) describe the core of this
423: processing, but these algorithms reference and are referenced by the
1.289 mike 424: parsing rules for <code><a href="#script" id="script-14">script</a></code> <a class="full-spec-link" href="http://dev.w3.org/html5/spec/tokenization.html#scriptTag" title='Read about this "start" reference in the full HTML5 spec.'>start</a>
1.160 mike 425: and <a class="full-spec-link" href="http://dev.w3.org/html5/spec/tokenization.html#scriptEndTag" title='Read about this "end" reference in the full HTML5 spec.'>end</a> tags in HTML, <a class="full-spec-link" href="http://dev.w3.org/html5/spec/tokenization.html#scriptForeignEndTag" title='Read about this "in foreign content" reference in the full HTML5 spec.'>in foreign content</a>, and <a class="full-spec-link" href="http://dev.w3.org/html5/spec/the-xhtml-syntax.html#scriptTagXML" title='Read about this "in XML" reference in the full HTML5 spec.'>in XML</a>, the rules for the <code title="dom-document-write"><a class="full-spec-link" href="http://dev.w3.org/html5/spec/apis-in-html-documents.html#dom-document-write" title='Read about this "document.write()" reference in the full HTML5 spec.'>document.write()</a></code> method, the
1.158 mike 426: handling of <a href="webappapis.html#scripting">scripting</a>, etc.<p>The <code title="attr-script-defer"><a href="#attr-script-defer" id="defer-2">defer</a></code> attribute may be
1.154 mike 427: specified even if the <code title="attr-script-async"><a href="#attr-script-async" id="async-3">async</a></code>
1.11 mike 428: attribute is specified, to cause legacy Web browsers that only
1.154 mike 429: support <code title="attr-script-defer"><a href="#attr-script-defer" id="defer-3">defer</a></code> (and not <code title="attr-script-async"><a href="#attr-script-async" id="async-4">async</a></code>) to fall back to the <code title="attr-script-defer"><a href="#attr-script-defer" id="defer-4">defer</a></code> behavior instead of the
1.184 mike 430: synchronous blocking behavior that is the default.<p>Changing the <code title="attr-script-src"><a href="#attr-script-src" id="src-8">src</a></code>, <code title="attr-script-type"><a href="#attr-script-type" id="type-11">type</a></code>, <code title="attr-script-charset"><a href="#attr-script-charset" id="charset-11">charset</a></code>, <code title="attr-script-async"><a href="#attr-script-async" id="async-5">async</a></code>, and <code title="attr-script-defer"><a href="#attr-script-defer" id="defer-5">defer</a></code> attributes dynamically has no
1.12 mike 431: direct effect; these attribute are only used at specific times
432: described below.</p><!-- by implication, changes to the base URL
1.160 mike 433: also have no effect --><dl class="domintro"><dt><var title="">script</var> . <code title="dom-script-text"><a class="full-spec-link" href="http://dev.w3.org/html5/spec/scripting-1.html#dom-script-text" title='Read about this "text" reference in the full HTML5 spec.'>text</a></code> [ = <var title="">value</var> ]</dt>
1.11 mike 434:
435: <dd>
436:
437: <p>Returns the contents of the element, ignoring child nodes that
1.154 mike 438: aren't <a href="infrastructure.html#text-node" id="text-node-8" title="text node">text nodes</a>.</p>
1.11 mike 439:
440: <p>Can be set, to replace the element's children with the given
441: value.</p>
442:
443: </dd>
444:
1.160 mike 445: </dl><p class="note">When inserted using the <code title="dom-document-write"><a class="full-spec-link" href="http://dev.w3.org/html5/spec/apis-in-html-documents.html#dom-document-write" title='Read about this "document.write()" reference in the full HTML5 spec.'>document.write()</a></code> method,
1.289 mike 446: <code><a href="#script" id="script-15">script</a></code> elements execute (typically synchronously), but
1.154 mike 447: when inserted using <code title="dom-innerHTML"><a href="apis-in-html-documents.html#dom-innerhtml" id="innerhtml-3">innerHTML</a></code> and <code title="dom-outerHTML"><a href="apis-in-html-documents.html#dom-outerhtml" id="outerhtml-2">outerHTML</a></code> attributes, they do not
1.158 mike 448: execute at all.<div class="example">
1.11 mike 449:
1.289 mike 450: <p>In this example, two <code><a href="#script" id="script-16">script</a></code> elements are used. One
1.11 mike 451: embeds an external script, and the other includes some data.</p>
452:
453: <pre><script src="game-engine.js"></script>
454: <script type="text/x-game-map">
455: ........U.........e
456: o............A....e
457: .....A.....AAA....e
458: .A..AAA...AAAAA...e
459: </script></pre>
460:
461: <p>The data in this case might be used by the script to generate
462: the map of a video game. The data doesn't have to be used that way,
463: though; maybe the map data is actually embedded in other parts of
464: the page's markup, and the data block here is just used by the
465: site's search engine to help users who are looking for particular
466: features in their game maps.</p>
467:
468: </div><div class="example">
469:
470: <p>The following sample shows how a script element can be used to
471: define a function that is then used by other parts of the
1.289 mike 472: document. It also shows how a <code><a href="#script" id="script-17">script</a></code> element can be
1.11 mike 473: used to invoke script while the document is being parsed, in this
474: case to initialize the form's output.</p>
475:
476: <pre><script>
477: function calculate(form) {
478: var price = 52000;
479: if (form.elements.brakes.checked)
480: price += 1000;
481: if (form.elements.radio.checked)
482: price += 2500;
483: if (form.elements.turbo.checked)
484: price += 5000;
485: if (form.elements.sticker.checked)
486: price += 250;
487: form.elements.result.value = price;
488: }
489: </script>
490: <form name="pricecalc" onsubmit="return false">
491: <fieldset>
492: <legend>Work out the price of your car</legend>
1.158 mike 493: <p>Base cost: £52000.</p>
1.11 mike 494: <p>Select additional options:</p>
495: <ul>
1.158 mike 496: <li><label><input type=checkbox name=brakes> Ceramic brakes (£1000)</label></li>
497: <li><label><input type=checkbox name=radio> Satellite radio (£2500)</label></li>
498: <li><label><input type=checkbox name=turbo> Turbo charger (£5000)</label></li>
499: <li><label><input type=checkbox name=sticker> "XZ" sticker (£250)</label></li>
1.11 mike 500: </ul>
1.158 mike 501: <p>Total: £<output name=result onformchange="calculate(form)"></output></p>
1.11 mike 502: </fieldset>
503: <script>
504: document.forms.pricecalc.dispatchFormChange();
505: </script>
506: </form></pre>
507:
1.199 mike 508: </div><h5 id="scriptingLanguages"><span class="secno">4.3.1.1 </span>Scripting languages</h5><p>The following lists some <a href="infrastructure.html#mime-type" id="mime-type-4">MIME type</a> strings and the
1.158 mike 509: languages to which they refer:<dl><dt>"<code>application/ecmascript</code>"</dt>
1.11 mike 510: <dt>"<code>application/javascript</code>"</dt>
511: <dt>"<code>application/x-ecmascript</code>"</dt>
512: <dt>"<code>application/x-javascript</code>"</dt>
513: <dt>"<code>text/ecmascript</code>"</dt>
514: <dt>"<code>text/javascript</code>"</dt>
515: <dt>"<code>text/javascript1.0</code>"</dt>
516: <dt>"<code>text/javascript1.1</code>"</dt>
517: <dt>"<code>text/javascript1.2</code>"</dt>
518: <dt>"<code>text/javascript1.3</code>"</dt>
519: <dt>"<code>text/javascript1.4</code>"</dt>
520: <dt>"<code>text/javascript1.5</code>"</dt>
521: <dt>"<code>text/jscript</code>"</dt>
522: <dt>"<code>text/livescript</code>"</dt>
523: <dt>"<code>text/x-ecmascript</code>"</dt>
524: <dt>"<code>text/x-javascript</code>"</dt>
1.26 mike 525: <dd>JavaScript. <a href="references.html#refsECMA262">[ECMA262]</a></dd>
1.11 mike 526:
527: <dt>"<code>text/javascript;e4x=1</code>"</dt>
1.26 mike 528: <dd>JavaScript with ECMAScript for XML. <a href="references.html#refsECMA357">[ECMA357]</a></dd>
1.11 mike 529:
1.289 mike 530: </dl><h5 id="restrictions-for-contents-of-script-elements"><span class="secno">4.3.1.2 </span><dfn title="script content restrictions">Restrictions for contents of <code>script</code> elements</dfn></h5><p>The <code><a class="full-spec-link" href="http://dev.w3.org/html5/spec/infrastructure.html#textcontent" title='Read about this "textContent" reference in the full HTML5 spec.'>textContent</a></code> of a <code><a href="#script" id="script-18">script</a></code> element must match the
1.11 mike 531: <code title="">script</code> production in the following ABNF, the
1.158 mike 532: character set for which is Unicode. <a href="references.html#refsABNF">[ABNF]</a><pre>script = data1 *( escape [ script-start data3 ] "-->" data1 ) [ escape ]
1.11 mike 533: escape = "<!--" data2 *( script-start data3 script-end data2 )
534:
535: data1 = <any string that doesn't contain a substring that matches not-data1>
536: not-data1 = <!-- script-end / -->"<!--" <!-- the script-end is redundant here since it would close the element -->
537:
538: data2 = <any string that doesn't contain a substring that matches not-data2>
539: not-data2 = <!-- script-end / -->script-start / "-->" <!-- the script-end is redundant here since it would close the element -->
540:
541: data3 = <any string that doesn't contain a substring that matches not-data3>
542: not-data3 = script-end / "-->"
543:
544: script-start = lt s c r i p t tag-end
545: script-end = lt slash s c r i p t tag-end
546:
547: lt = %x003C ; U+003C LESS-THAN SIGN character (<)
548: slash = %x002F ; U+002F SOLIDUS character (/)
549:
550: s = %x0053 ; U+0053 LATIN CAPITAL LETTER S
551: s =/ %x0073 ; U+0073 LATIN SMALL LETTER S
552: c = %x0043 ; U+0043 LATIN CAPITAL LETTER C
553: c =/ %x0063 ; U+0063 LATIN SMALL LETTER C
554: r = %x0052 ; U+0052 LATIN CAPITAL LETTER R
555: r =/ %x0072 ; U+0072 LATIN SMALL LETTER R
556: i = %x0049 ; U+0049 LATIN CAPITAL LETTER I
557: i =/ %x0069 ; U+0069 LATIN SMALL LETTER I
558: p = %x0050 ; U+0050 LATIN CAPITAL LETTER P
559: p =/ %x0070 ; U+0070 LATIN SMALL LETTER P
560: t = %x0054 ; U+0054 LATIN CAPITAL LETTER T
561: t =/ %x0074 ; U+0074 LATIN SMALL LETTER T
562:
563: tag-end = %x0009 ; U+0009 CHARACTER TABULATION
564: tag-end =/ %x000A ; U+000A LINE FEED (LF)
565: tag-end =/ %x000C ; U+000C FORM FEED (FF)
566: tag-end =/ %x0020 ; U+0020 SPACE
567: tag-end =/ %x002F ; U+002F SOLIDUS (/)
1.289 mike 568: tag-end =/ %x003E ; U+003E GREATER-THAN SIGN (>)</pre><p>When a <code><a href="#script" id="script-19">script</a></code> element contains <a href="#inline-documentation-for-external-scripts" id="script-documentation-0">script
1.11 mike 569: documentation</a>, there are further restrictions on the contents
1.289 mike 570: of the element, as described in the section below.<h5 id="inline-documentation-for-external-scripts"><span class="secno">4.3.1.3 </span><dfn title="script documentation">Inline documentation for external scripts</dfn></h5><p>If a <code><a href="#script" id="script-20">script</a></code> element's <code title="attr-script-src"><a href="#attr-script-src" id="src-9">src</a></code> attribute is specified, then the
571: contents of the <code><a href="#script" id="script-21">script</a></code> element, if any, must be such
1.160 mike 572: that the value of the <code title="dom-script-text"><a class="full-spec-link" href="http://dev.w3.org/html5/spec/scripting-1.html#dom-script-text" title='Read about this "text" reference in the full HTML5 spec.'>text</a></code> IDL
1.11 mike 573: attribute, which is derived from the element's contents, matches the
574: <code title="">documentation</code> production in the following
1.158 mike 575: ABNF, the character set for which is Unicode. <a href="references.html#refsABNF">[ABNF]</a><pre>documentation = *( *( space / tab / comment ) [ line-comment ] newline )
1.11 mike 576: comment = slash star *( not-star / star not-slash ) 1*star slash
577: line-comment = slash slash *not-newline
578:
579: ; characters
580: tab = %x0009 ; U+0009 TAB
581: newline = %x000A ; U+000A LINE FEED (LF)
582: space = %x0020 ; U+0020 SPACE
583: star = %x002A ; U+002A ASTERISK (*)
584: slash = %x002F ; U+002F SOLIDUS (/)
585: not-newline = %x0000-0009 / %x000B-10FFFF
586: ; a Unicode character other than U+000A LINE FEED (LF)
587: not-star = %x0000-0029 / %x002B-10FFFF
588: ; a Unicode character other than U+002A ASTERISK (*)
589: not-slash = %x0000-002E / %x0030-10FFFF
590: ; a Unicode character other than U+002F SOLIDUS (/)</pre><p class="note">This corresponds to putting the contents of the
1.158 mike 591: element in JavaScript comments.<p class="note">This requirement is in addition to the earlier
1.289 mike 592: restrictions on the syntax of contents of <code><a href="#script" id="script-22">script</a></code>
1.158 mike 593: elements.<div class="example">
1.11 mike 594:
595: <p>This allows authors to include documentation, such as license
596: information or API information, inside their documents while still
597: referring to external script files. The syntax is constrained so
598: that authors don't accidentally include what looks like valid
1.154 mike 599: script while also providing a <code title="attr-script-src"><a href="#attr-script-src" id="src-10">src</a></code> attribute.</p>
1.11 mike 600:
601: <pre><script src="cool-effects.js">
602: // create new instances using:
603: // var e = new Effect();
604: // start the effect using .play, stop using .stop:
605: // e.play();
606: // e.stop();
607: </script></pre>
608:
1.246 mike 609: </div><h4 id="the-noscript-element"><span class="secno">4.3.2 </span>The <dfn><code>noscript</code></dfn> element</h4><dl class="element"><dt>Categories</dt>
1.154 mike 610: <dd><a href="content-models.html#metadata-content" id="metadata-content-15">Metadata content</a>.</dd>
1.200 mike 611: <dd><a href="content-models.html#flow-content" id="flow-content-13">Flow content</a>.</dd>
612: <dd><a href="content-models.html#phrasing-content" id="phrasing-content-18">Phrasing content</a>.</dd>
613: <dt>Contexts in which this element can be used:</dt>
1.199 mike 614: <dd>In a <code><a href="semantics.html#the-head-element-0" id="head-19">head</a></code> element of an <a href="dom.html#html-documents" id="html-documents-17" title="HTML documents">HTML document</a>, if there are no ancestor <code><a href="#the-noscript-element" id="noscript-7">noscript</a></code> elements.</dd>
1.200 mike 615: <dd>Where <a href="content-models.html#phrasing-content" id="phrasing-content-19">phrasing content</a> is expected in <a href="dom.html#html-documents" id="html-documents-18">HTML documents</a>, if there are no ancestor <code><a href="#the-noscript-element" id="noscript-8">noscript</a></code> elements.</dd>
1.11 mike 616: <dt>Content model:</dt>
1.259 mike 617: <dd>When <a class="full-spec-link" href="http://dev.w3.org/html5/spec/webappapis.html#concept-n-noscript" title='Read about this "scripting is disabled" reference in the full HTML5 spec.'>scripting is disabled</a>, in a <code><a href="semantics.html#the-head-element-0" id="head-20">head</a></code> element: in any order, zero or more <code><a href="semantics.html#the-link-element" id="link-23">link</a></code> elements, zero or more <code><a href="semantics.html#the-style-element" id="style-27">style</a></code> elements, and zero or more <code><a href="semantics.html#meta" id="meta-28">meta</a></code> elements.</dd>
1.199 mike 618: <dd>When <a class="full-spec-link" href="http://dev.w3.org/html5/spec/webappapis.html#concept-n-noscript" title='Read about this "scripting is disabled" reference in the full HTML5 spec.'>scripting is disabled</a>, not in a <code><a href="semantics.html#the-head-element-0" id="head-21">head</a></code> element: <a href="content-models.html#transparent" id="transparent-1">transparent</a>, but there must be no <code><a href="#the-noscript-element" id="noscript-9">noscript</a></code> element descendants.</dd>
1.11 mike 619: <dd>Otherwise: text that conforms to the requirements given in the prose.</dd>
620: <dt>Content attributes:</dt>
1.154 mike 621: <dd><a href="elements.html#global-attributes" id="global-attributes-8">Global attributes</a></dd>
1.11 mike 622: <dt>DOM interface:</dt>
1.154 mike 623: <dd>Uses <code><a href="elements.html#htmlelement" id="htmlelement-15">HTMLElement</a></code>.</dd>
1.188 mike 624: </dl><p>The <code><a href="#the-noscript-element" id="noscript-10">noscript</a></code> element <a class="full-spec-link" href="http://dev.w3.org/html5/spec/rendering.html#represents" title='Read about this "represents" reference in the full HTML5 spec.'>represents</a> nothing
1.160 mike 625: if <a class="full-spec-link" href="http://dev.w3.org/html5/spec/webappapis.html#concept-n-script" title='Read about this "scripting is enabled" reference in the full HTML5 spec.'>scripting is enabled</a>, and
626: <a class="full-spec-link" href="http://dev.w3.org/html5/spec/rendering.html#represents" title='Read about this "represents" reference in the full HTML5 spec.'>represents</a> its children if <a class="full-spec-link" href="http://dev.w3.org/html5/spec/webappapis.html#concept-n-noscript" title='Read about this "scripting is disabled" reference in the full HTML5 spec.'>scripting is disabled</a>. It is used
1.11 mike 627: to present different markup to user agents that support scripting
628: and those that don't support scripting, by affecting how the
1.158 mike 629: document is parsed.<p>When used in <a href="dom.html#html-documents" id="html-documents-19">HTML documents</a>, the allowed content
1.199 mike 630: model is as follows:<dl><dt>In a <code><a href="semantics.html#the-head-element-0" id="head-22">head</a></code> element, if <a class="full-spec-link" href="http://dev.w3.org/html5/spec/webappapis.html#concept-n-noscript" title='Read about this "scripting is disabled" reference in the full HTML5 spec.'>scripting is disabled</a> for the
1.188 mike 631: <code><a href="#the-noscript-element" id="noscript-11">noscript</a></code> element</dt>
1.154 mike 632:
1.188 mike 633: <dd><p>The <code><a href="#the-noscript-element" id="noscript-12">noscript</a></code> element must contain only
1.259 mike 634: <code><a href="semantics.html#the-link-element" id="link-24">link</a></code>, <code><a href="semantics.html#the-style-element" id="style-28">style</a></code>, and <code><a href="semantics.html#meta" id="meta-29">meta</a></code>
1.158 mike 635: elements.</dd>
1.11 mike 636:
1.199 mike 637: <dt>In a <code><a href="semantics.html#the-head-element-0" id="head-23">head</a></code> element, if <a class="full-spec-link" href="http://dev.w3.org/html5/spec/webappapis.html#concept-n-script" title='Read about this "scripting is enabled" reference in the full HTML5 spec.'>scripting is enabled</a> for the
1.188 mike 638: <code><a href="#the-noscript-element" id="noscript-13">noscript</a></code> element</dt>
1.11 mike 639:
1.188 mike 640: <dd><p>The <code><a href="#the-noscript-element" id="noscript-14">noscript</a></code> element must contain only text,
1.160 mike 641: except that invoking the <a class="full-spec-link" href="http://dev.w3.org/html5/spec/the-end.html#html-fragment-parsing-algorithm" title='Read about this "HTML fragment parsing algorithm" reference in the full HTML5 spec.'>HTML fragment parsing
1.12 mike 642: algorithm</a> <!-- (which disables <script type="text/javascript"> execution) --> with
1.188 mike 643: the <code><a href="#the-noscript-element" id="noscript-15">noscript</a></code> element as the <var title="">context</var> element and the text contents as the <var title="">input</var> must result in a list of nodes that consists
1.259 mike 644: only of <code><a href="semantics.html#the-link-element" id="link-25">link</a></code>, <code><a href="semantics.html#the-style-element" id="style-29">style</a></code>, and
1.187 mike 645: <code><a href="semantics.html#meta" id="meta-30">meta</a></code> elements that would be conforming if they were
1.188 mike 646: children of the <code><a href="#the-noscript-element" id="noscript-16">noscript</a></code> element, and no <a class="full-spec-link" href="http://dev.w3.org/html5/spec/parsing.html#parse-error" title='Read about this "parse errors" reference in the full HTML5 spec.'>parse errors</a>.</dd>
1.154 mike 647:
1.199 mike 648: <dt>Outside of <code><a href="semantics.html#the-head-element-0" id="head-24">head</a></code> elements, if <a class="full-spec-link" href="http://dev.w3.org/html5/spec/webappapis.html#concept-n-noscript" title='Read about this "scripting is disabled" reference in the full HTML5 spec.'>scripting is disabled</a> for the
1.188 mike 649: <code><a href="#the-noscript-element" id="noscript-17">noscript</a></code> element</dt>
1.154 mike 650:
1.188 mike 651: <dd><p>The <code><a href="#the-noscript-element" id="noscript-18">noscript</a></code> element's content model is
1.154 mike 652: <a href="content-models.html#transparent" id="transparent-2">transparent</a>, with the additional restriction that a
1.188 mike 653: <code><a href="#the-noscript-element" id="noscript-19">noscript</a></code> element must not have a <code><a href="#the-noscript-element" id="noscript-20">noscript</a></code>
654: element as an ancestor (that is, <code><a href="#the-noscript-element" id="noscript-21">noscript</a></code> can't be
1.158 mike 655: nested).</dd>
1.11 mike 656:
1.199 mike 657: <dt>Outside of <code><a href="semantics.html#the-head-element-0" id="head-25">head</a></code> elements, if <a class="full-spec-link" href="http://dev.w3.org/html5/spec/webappapis.html#concept-n-script" title='Read about this "scripting is enabled" reference in the full HTML5 spec.'>scripting is enabled</a> for the
1.188 mike 658: <code><a href="#the-noscript-element" id="noscript-22">noscript</a></code> element</dt>
1.11 mike 659:
660: <dd>
661:
1.188 mike 662: <p>The <code><a href="#the-noscript-element" id="noscript-23">noscript</a></code> element must contain only text,
1.11 mike 663: except that the text must be such that running the following
664: algorithm results in a conforming document with no
1.289 mike 665: <code><a href="#the-noscript-element" id="noscript-24">noscript</a></code> elements and no <code><a href="#script" id="script-23">script</a></code>
1.11 mike 666: elements, and such that no step in the algorithm causes an
1.160 mike 667: <a class="full-spec-link" href="http://dev.w3.org/html5/spec/parsing.html#html-parser" title='Read about this "HTML parser" reference in the full HTML5 spec.'>HTML parser</a> to flag a <a class="full-spec-link" href="http://dev.w3.org/html5/spec/parsing.html#parse-error" title='Read about this "parse error" reference in the full HTML5 spec.'>parse error</a>:</p>
1.11 mike 668:
1.289 mike 669: <ol><li>Remove every <code><a href="#script" id="script-24">script</a></code> element from the
1.11 mike 670: document.</li>
671:
1.188 mike 672: <li>Make a list of every <code><a href="#the-noscript-element" id="noscript-25">noscript</a></code> element in the
673: document. For every <code><a href="#the-noscript-element" id="noscript-26">noscript</a></code> element in that list,
1.11 mike 674: perform the following steps:
675:
676: <ol><li>Let the <var title="">parent element</var> be the parent
1.188 mike 677: element of the <code><a href="#the-noscript-element" id="noscript-27">noscript</a></code> element.</li>
1.11 mike 678:
679: <li>Take all the children of the <var title="">parent element</var>
1.188 mike 680: that come before the <code><a href="#the-noscript-element" id="noscript-28">noscript</a></code> element, and call these
1.11 mike 681: elements <var title="">the before children</var>.</li>
682:
683: <li>Take all the children of the <var title="">parent element</var>
1.188 mike 684: that come <em>after</em> the <code><a href="#the-noscript-element" id="noscript-29">noscript</a></code> element, and
1.11 mike 685: call these elements <var title="">the after children</var>.</li>
686:
687: <li>Let <var title="">s</var> be the concatenation of all the
1.188 mike 688: <a href="infrastructure.html#text-node" id="text-node-9">text node</a> children of the <code><a href="#the-noscript-element" id="noscript-30">noscript</a></code>
1.11 mike 689: element.</li>
690:
1.154 mike 691: <li>Set the <code title="dom-innerHTML"><a href="apis-in-html-documents.html#dom-innerhtml" id="innerhtml-4">innerHTML</a></code>
1.11 mike 692: attribute of the <var title="">parent element</var> to the value
693: of <var title="">s</var>. (This, as a side-effect, causes the
1.188 mike 694: <code><a href="#the-noscript-element" id="noscript-31">noscript</a></code> element to be removed from the
1.11 mike 695: document.)</li>
696:
697: <li>Insert <var title="">the before children</var> at the start of
698: the <var title="">parent element</var>, preserving their original
699: relative order.</li>
700:
701: <li>Insert <var title="">the after children</var> at the end of the
702: <var title="">parent element</var>, preserving their original
703: relative order.</li>
704:
705: </ol></li>
706:
707: </ol></dd>
708:
709: </dl><p class="note">All these contortions are required because, for
1.188 mike 710: historical reasons, the <code><a href="#the-noscript-element" id="noscript-32">noscript</a></code> element is handled
1.160 mike 711: differently by the <a class="full-spec-link" href="http://dev.w3.org/html5/spec/parsing.html#html-parser" title='Read about this "HTML parser" reference in the full HTML5 spec.'>HTML parser</a> based on whether <a class="full-spec-link" href="http://dev.w3.org/html5/spec/parsing.html#scripting-flag" title='Read about this "scripting was enabled or not" reference in the full HTML5 spec.'>scripting was enabled or not</a> when the
1.239 mike 712: parser was invoked.<p>The <code><a href="#the-noscript-element" id="noscript-33">noscript</a></code> element must not be used in <a href="dom.html#xml-documents" id="xml-documents-19">XML
1.188 mike 713: documents</a>.<p class="note"><strong>The <code><a href="#the-noscript-element" id="noscript-34">noscript</a></code> element is only
1.154 mike 714: effective in <a href="syntax.html#syntax" id="the-html-syntax-2">the HTML syntax</a>, it has no effect in
1.158 mike 715: <a href="the-xhtml-syntax.html#the-xhtml-syntax">the XHTML syntax</a>.</strong><div class="example">
1.11 mike 716:
1.188 mike 717: <p>In the following example, a <code><a href="#the-noscript-element" id="noscript-35">noscript</a></code> element is
1.11 mike 718: used to provide fallback for a script.</p>
719:
720: <pre><form action="calcSquare.php">
721: <p>
722: <label for=x>Number</label>:
723: <input id="x" name="x" type="number">
724: </p>
725: <script>
726: var x = document.getElementById('x');
727: var output = document.createElement('p');
728: output.textContent = 'Type a number; it will be squared right then!';
729: x.form.appendChild(output);
730: x.form.onsubmit = function () { return false; }
731: x.oninput = function () {
732: var v = x.valueAsNumber;
733: output.textContent = v + ' squared is ' + v * v;
734: };
735: </script>
736: <noscript>
737: <input type=submit value="Calculate Square">
738: </noscript>
739: </form></pre>
740:
741: <p>When script is disabled, a button appears to do the calculation
742: on the server side. When script is enabled, the value is computed
743: on-the-fly instead.</p>
744:
1.188 mike 745: <p>The <code><a href="#the-noscript-element" id="noscript-36">noscript</a></code> element is a blunt
1.11 mike 746: instrument. Sometimes, scripts might be enabled, but for some
747: reason the page's script might fail. For this reason, it's
1.188 mike 748: generally better to avoid using <code><a href="#the-noscript-element" id="noscript-37">noscript</a></code>, and to
1.11 mike 749: instead design the script to change the page from being a
750: scriptless page to a scripted page on the fly, as in the next
751: example:</p>
752:
753: <pre><form action="calcSquare.php">
754: <p>
755: <label for=x>Number</label>:
756: <input id="x" name="x" type="number">
757: </p>
758: <strong><input id="submit" type=submit value="Calculate Square"></strong>
759: <script>
760: var x = document.getElementById('x');
761: var output = document.createElement('p');
762: output.textContent = 'Type a number; it will be squared right then!';
763: x.form.appendChild(output);
764: x.form.onsubmit = function () { return false; }
765: x.oninput = function () {
766: var v = x.valueAsNumber;
767: output.textContent = v + ' squared is ' + v * v;
768: };
769: <strong> var submit = document.getElementById('submit');
770: submit.parentNode.removeChild(submit);</strong>
771: </script>
772: </form></pre>
773:
774: <p>The above technique is also useful in XHTML, since
1.188 mike 775: <code><a href="#the-noscript-element" id="noscript-38">noscript</a></code> is not supported in <a href="the-xhtml-syntax.html#the-xhtml-syntax">the XHTML
1.11 mike 776: syntax</a>.</p>
777:
1.158 mike 778: </div>
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