Annotation of html5/spec-author-view/scripting-1.html, revision 1.134
1.53 mike 1: <!DOCTYPE html><!-- when publishing, change bits marked ZZZ --><html class="split chapter" lang="en-US-x-Hixie"><head><meta content="text/html; charset=UTF-8" http-equiv="Content-Type"><title>4.3 Scripting — HTML5 (Edition for Web Authors)</title><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; }
4: h3 { margin: 2.5em 0 1em 0; }
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13: dt + dt { margin-top: 0; }
14: dd dt { margin-top: 0.25em; margin-bottom: 0; }
15: dd p { margin-top: 0; }
16: dd dl + p { margin-top: 1em; }
17: dd table + p { margin-top: 1em; }
18: p + * > li, dd li { margin: 1em 0; }
19: dt, dfn { font-weight: bold; font-style: normal; }
20: dt dfn { font-style: italic; }
21: pre, code { font-size: inherit; font-family: monospace; font-variant: normal; }
22: pre strong { color: black; font: inherit; font-weight: bold; background: yellow; }
23: pre em { font-weight: bolder; font-style: normal; }
24: @media screen { code { color: orangered; } code :link, code :visited { color: inherit; } }
25: var sub { vertical-align: bottom; font-size: smaller; position: relative; top: 0.1em; }
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; }
31: blockquote { margin: 0 0 0 2em; border: 0; padding: 0; font-style: italic; }
32:
33: .bad, .bad *:not(.XXX) { color: gray; border-color: gray; background: transparent; }
34: .matrix, .matrix td { border: none; text-align: right; }
35: .matrix { margin-left: 2em; }
36: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
37: .dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
38: .dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
39:
40: .toc dfn, h1 dfn, h2 dfn, h3 dfn, h4 dfn, h5 dfn, h6 dfn { font: inherit; }
41: img.extra { float: right; }
42: pre.idl { border: solid thin; background: #EEEEEE; color: black; padding: 0.5em 1em; }
43: pre.idl :link, pre.idl :visited { color: inherit; background: transparent; }
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; }
49: dl.domintro dd { margin: 0.5em 0 1em 2em; padding: 0; }
50: dl.domintro dd p { margin: 0.5em 0; }
51: dl.switch { padding-left: 2em; }
52: dl.switch > dt { text-indent: -1.5em; }
53: dl.switch > dt:before { content: '\21AA'; padding: 0 0.5em 0 0; display: inline-block; width: 1em; text-align: right; line-height: 0.5em; }
54: dl.triple { padding: 0 0 0 1em; }
55: dl.triple dt, dl.triple dd { margin: 0; display: inline }
56: dl.triple dt:after { content: ':'; }
57: dl.triple dd:after { content: '\A'; white-space: pre; }
58: .diff-old { text-decoration: line-through; color: silver; background: transparent; }
59: .diff-chg, .diff-new { text-decoration: underline; color: green; background: transparent; }
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:
66: p > span:not([title=""]):not([class="XXX"]):not([class="impl"]), li > span:not([title=""]):not([class="XXX"]):not([class="impl"]) { border-bottom: solid #9999CC; }
67:
68: div.head { margin: 0 0 1em; padding: 1em 0 0 0; }
69: div.head p { margin: 0; }
70: div.head h1 { margin: 0; }
71: div.head .logo { float: right; margin: 0 1em; }
72: div.head .logo img { border: none } /* remove border from top image */
73: div.head dl { margin: 1em 0; }
74: div.head p.copyright, div.head p.alt { font-size: x-small; font-style: oblique; margin: 0; }
75:
76: body > .toc > li { margin-top: 1em; margin-bottom: 1em; }
77: body > .toc.brief > li { margin-top: 0.35em; margin-bottom: 0.35em; }
78: body > .toc > li > * { margin-bottom: 0.5em; }
79: body > .toc > li > * > li > * { margin-bottom: 0.25em; }
80: .toc, .toc li { list-style: none; }
81:
82: .brief { margin-top: 1em; margin-bottom: 1em; line-height: 1.1; }
83: .brief li { margin: 0; padding: 0; }
84: .brief li p { margin: 0; padding: 0; }
85:
86: .category-list { margin-top: -0.75em; margin-bottom: 1em; line-height: 1.5; }
87: .category-list::before { content: '\21D2\A0'; font-size: 1.2em; font-weight: 900; }
88: .category-list li { display: inline; }
89: .category-list li:not(:last-child)::after { content: ', '; }
90: .category-list li > span, .category-list li > a { text-transform: lowercase; }
91: .category-list li * { text-transform: none; } /* don't affect <code> nested in <a> */
92:
93: .XXX { color: #E50000; background: white; border: solid red; padding: 0.5em; margin: 1em 0; }
94: .XXX > :first-child { margin-top: 0; }
95: p .XXX { line-height: 3em; }
96: .annotation { border: solid thin black; background: #0C479D; color: white; position: relative; margin: 8px 0 20px 0; }
97: .annotation:before { position: absolute; left: 0; top: 0; width: 100%; height: 100%; margin: 6px -6px -6px 6px; background: #333333; z-index: -1; content: ''; }
98: .annotation :link, .annotation :visited { color: inherit; }
99: .annotation :link:hover, .annotation :visited:hover { background: transparent; }
100: .annotation span { border: none ! important; }
101: .note { color: green; background: transparent; font-family: sans-serif; }
102: .warning { color: red; background: transparent; }
103: .note, .warning { font-weight: bolder; font-style: italic; }
104: p.note, div.note { padding: 0.5em 2em; }
105: span.note { padding: 0 2em; }
106: .note p:first-child, .warning p:first-child { margin-top: 0; }
107: .note p:last-child, .warning p:last-child { margin-bottom: 0; }
108: .warning:before { font-style: normal; }
109: p.note:before { content: 'Note: '; }
110: p.warning:before { content: '\26A0 Warning! '; }
111:
112: .bookkeeping:before { display: block; content: 'Bookkeeping details'; font-weight: bolder; font-style: italic; }
113: .bookkeeping { font-size: 0.8em; margin: 2em 0; }
114: .bookkeeping p { margin: 0.5em 2em; display: list-item; list-style: square; }
1.130 mike 115: .bookkeeping dt { margin: 0.5em 2em 0; }
116: .bookkeeping dd { margin: 0 3em 0.5em; }
1.9 mike 117:
118: h4 { position: relative; z-index: 3; }
119: h4 + .element, h4 + div + .element { margin-top: -2.5em; padding-top: 2em; }
120: .element {
121: background: #EEEEFF;
122: color: black;
123: margin: 0 0 1em 0.15em;
124: padding: 0 1em 0.25em 0.75em;
125: border-left: solid #9999FF 0.25em;
126: position: relative;
127: z-index: 1;
128: }
129: .element:before {
130: position: absolute;
131: z-index: 2;
132: top: 0;
133: left: -1.15em;
134: height: 2em;
135: width: 0.9em;
136: background: #EEEEFF;
137: content: ' ';
138: border-style: none none solid solid;
139: border-color: #9999FF;
140: border-width: 0.25em;
141: }
142:
143: .example { display: block; color: #222222; background: #FCFCFC; border-left: double; margin-left: 2em; padding-left: 1em; }
144: td > .example:only-child { margin: 0 0 0 0.1em; }
145:
146: ul.domTree, ul.domTree ul { padding: 0 0 0 1em; margin: 0; }
147: ul.domTree li { padding: 0; margin: 0; list-style: none; position: relative; }
148: ul.domTree li li { list-style: none; }
149: 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; }
150: 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; }
151: ul.domTree span { font-style: italic; font-family: serif; }
152: ul.domTree .t1 code { color: purple; font-weight: bold; }
153: ul.domTree .t2 { font-style: normal; font-family: monospace; }
154: ul.domTree .t2 .name { color: black; font-weight: bold; }
155: ul.domTree .t2 .value { color: blue; font-weight: normal; }
156: ul.domTree .t3 code, .domTree .t4 code, .domTree .t5 code { color: gray; }
157: ul.domTree .t7 code, .domTree .t8 code { color: green; }
158: ul.domTree .t10 code { color: teal; }
159:
1.13 mike 160: body.dfnEnabled dfn { cursor: pointer; }
161: .dfnPanel {
162: display: inline;
163: position: absolute;
164: z-index: 10;
165: height: auto;
166: width: auto;
167: padding: 0.5em 0.75em;
168: font: small sans-serif, Droid Sans Fallback;
169: background: #DDDDDD;
170: color: black;
171: border: outset 0.2em;
172: }
173: .dfnPanel * { margin: 0; padding: 0; font: inherit; text-indent: 0; }
174: .dfnPanel :link, .dfnPanel :visited { color: black; }
175: .dfnPanel p { font-weight: bolder; }
176: .dfnPanel * + p { margin-top: 0.25em; }
177: .dfnPanel li { list-style-position: inside; }
178:
1.9 mike 179: #configUI { position: absolute; z-index: 20; top: 10em; right: 1em; width: 11em; font-size: small; }
180: #configUI p { margin: 0.5em 0; padding: 0.3em; background: #EEEEEE; color: black; border: inset thin; }
181: #configUI p label { display: block; }
182: #configUI #updateUI, #configUI .loginUI { text-align: center; }
183: #configUI input[type=button] { display: block; margin: auto; }
1.119 mike 184:
1.9 mike 185: </style><style type="text/css">
186:
187: .applies thead th > * { display: block; }
188: .applies thead code { display: block; }
189: .applies tbody th { whitespace: nowrap; }
190: .applies td { text-align: center; }
191: .applies .yes { background: yellow; }
192:
1.134 ! mike 193: .matrix, .matrix td { border: hidden; text-align: right; }
1.9 mike 194: .matrix { margin-left: 2em; }
195:
196: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
197: .dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
198: .dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
199:
200: #table-example-1 { border: solid thin; border-collapse: collapse; margin-left: 3em; }
201: #table-example-1 * { font-family: "Essays1743", serif; line-height: 1.01em; }
202: #table-example-1 caption { padding-bottom: 0.5em; }
203: #table-example-1 thead, #table-example-1 tbody { border: none; }
204: #table-example-1 th, #table-example-1 td { border: solid thin; }
205: #table-example-1 th { font-weight: normal; }
206: #table-example-1 td { border-style: none solid; vertical-align: top; }
207: #table-example-1 th { padding: 0.5em; vertical-align: middle; text-align: center; }
208: #table-example-1 tbody tr:first-child td { padding-top: 0.5em; }
209: #table-example-1 tbody tr:last-child td { padding-bottom: 1.5em; }
210: #table-example-1 tbody td:first-child { padding-left: 2.5em; padding-right: 0; width: 9em; }
211: #table-example-1 tbody td:first-child::after { content: leader(". "); }
212: #table-example-1 tbody td { padding-left: 2em; padding-right: 2em; }
213: #table-example-1 tbody td:first-child + td { width: 10em; }
214: #table-example-1 tbody td:first-child + td ~ td { width: 2.5em; }
215: #table-example-1 tbody td:first-child + td + td + td ~ td { width: 1.25em; }
216:
217: .apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
218: .apple-table-examples * { font-family: "Times", serif; }
219: .apple-table-examples td, .apple-table-examples th { border: none; white-space: nowrap; padding-top: 0; padding-bottom: 0; }
220: .apple-table-examples tbody th:first-child { border-left: none; width: 100%; }
221: .apple-table-examples thead th:first-child ~ th { font-size: smaller; font-weight: bolder; border-bottom: solid 2px; text-align: center; }
222: .apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
223: .apple-table-examples tbody th, .apple-table-examples tfoot th { font: inherit; text-align: left; }
224: .apple-table-examples td { text-align: right; vertical-align: top; }
225: .apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
1.11 mike 226: .apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
227: .apple-table-examples.e2 th[scope=row] { padding-left: 1em; }
228: .apple-table-examples sup { line-height: 0; }
229:
1.12 mike 230: .details-example img { vertical-align: top; }
231:
1.22 mike 232: #named-character-references-table {
233: font-size: 0.6em;
234: column-width: 28em;
235: column-gap: 1em;
236: -moz-column-width: 28em;
237: -moz-column-gap: 1em;
238: -webkit-column-width: 28em;
239: -webkit-column-gap: 1em;
240: }
241: #named-character-references-table > table > tbody > tr > td:last-child { text-align: center; }
242: #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; }
243:
1.33 mike 244: .glyph.control { color: red; }
245:
1.36 mike 246: @font-face {
247: font-family: 'Essays1743';
248: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743.ttf');
249: }
250: @font-face {
251: font-family: 'Essays1743';
252: font-weight: bold;
253: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Bold.ttf');
254: }
255: @font-face {
256: font-family: 'Essays1743';
257: font-style: italic;
258: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Italic.ttf');
259: }
260: @font-face {
261: font-family: 'Essays1743';
262: font-style: italic;
263: font-weight: bold;
264: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-BoldItalic.ttf');
265: }
266:
1.21 mike 267: </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">
1.11 mike 268: function getCookie(name) {
269: var params = location.search.substr(1).split("&");
270: for (var index = 0; index < params.length; index++) {
271: if (params[index] == name)
272: return "1";
273: var data = params[index].split("=");
274: if (data[0] == name)
275: return unescape(data[1]);
276: }
277: var cookies = document.cookie.split("; ");
278: for (var index = 0; index < cookies.length; index++) {
279: var data = cookies[index].split("=");
280: if (data[0] == name)
281: return unescape(data[1]);
282: }
283: return null;
284: }
285: function load(script) {
286: var e = document.createElement('script');
287: e.setAttribute('src', 'http://www.whatwg.org/specs/web-apps/current-work/' + script + '?' + encodeURIComponent(location) + '&' + encodeURIComponent(document.referrer));
288: document.body.appendChild(e);
289: }
290: function init() {
291: if (location.search == '?slow-browser')
292: return;
293: var configUI = document.createElement('div');
294: configUI.id = 'configUI';
295: document.body.appendChild(configUI);
296: // load('reviewer.js'); // would need cross-site XHR
297: if (document.getElementById('head'))
298: load('toc.js');
299:
300: // load('updater.js'); // would need cross-site XHR
1.12 mike 301: load('dfn.js'); // doesn't support split-out specs, but, oh well.
1.11 mike 302: // load('status.js'); // would need cross-site XHR
303: if (getCookie('profile') == '1')
304: document.getElementsByTagName('h2')[0].textContent += '; load: ' + (new Date() - loadTimer) + 'ms';
305: fixBrokenLink();
306: }
1.52 mike 307: </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">
1.46 mike 308: <link href="Overview.html#contents" rel="index" title="Table of contents">
309: <link href="sections.html" rel="next" title="4.4 Sections">
310: <body onload="fixBrokenLink(); init()"><div class="head" id="head">
1.11 mike 311: <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 312:
1.134 ! mike 313: <h1>HTML5 (Edition for Web Authors)<span class="rcsrevision"> revision 1.4206</span></h1>
1.11 mike 314: </div><div>
1.46 mike 315: <a href="semantics.html">← 4 The elements of HTML</a> –
316: <a href="Overview.html#contents">Table of contents</a> –
317: <a href="sections.html">4.4 Sections →</a>
1.11 mike 318: <ol class="toc"><li><ol><li><a href="scripting-1.html#scripting-1"><span class="secno">4.3 </span>Scripting</a>
319: <ol><li><a href="scripting-1.html#script"><span class="secno">4.3.1 </span>The <code>script</code> element</a>
1.46 mike 320: <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"><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"><span class="secno">4.3.1.3 </span>Inline documentation for external scripts</a></ol><li><a href="scripting-1.html#the-noscript-element"><span class="secno">4.3.2 </span>The <code>noscript</code> element</a></ol></ol></ol></div>
1.11 mike 321:
1.46 mike 322: <h3 id="scripting-1"><span class="secno">4.3 </span>Scripting</h3><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i><p>Scripts allow authors to add interactivity to their documents.<p>Authors are encouraged to use declarative alternatives to
1.11 mike 323: scripting where possible, as declarative mechanisms are often more
1.46 mike 324: maintainable, and many users disable scripting.<div class="example">
1.11 mike 325: <p>For example, instead of using script to show or hide a section
326: to show more details, the <code><a href="interactive-elements.html#the-details-element">details</a></code> element could be
327: used.</p>
328: </div><p>Authors are also encouraged to make their applications degrade
1.46 mike 329: gracefully in the absence of scripting support.<div class="example">
1.11 mike 330: <p>For example, if an author provides a link in a table header to
331: dynamically resort the table, the link could also be made to
332: function without scripts by requesting the sorted table from the
333: server.</p>
1.46 mike 334: </div><h4 id="script"><span class="secno">4.3.1 </span>The <dfn><code>script</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i><dl class="element"><dt>Categories</dt>
1.11 mike 335: <dd><a href="content-models.html#metadata-content">Metadata content</a>.</dd>
336: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
337: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
338: <dt>Contexts in which this element may be used:</dt>
339: <dd>Where <a href="content-models.html#metadata-content">metadata content</a> is expected.</dd>
340: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
341: <dt>Content model:</dt>
342: <dd>If there is no <code title="attr-script-src"><a href="#attr-script-src">src</a></code>
343: attribute, depends on the value of the <code title="attr-script-type"><a href="#attr-script-type">type</a></code> attribute, but must match
344: <a href="#restrictions-for-contents-of-script-elements">script content restrictions</a>.</dd>
345: <dd>If there <em>is</em> a <code title="attr-script-src"><a href="#attr-script-src">src</a></code>
346: attribute, the element must be either empty or contain only
347: <a href="#inline-documentation-for-external-scripts">script documentation</a> that also matches <a href="#restrictions-for-contents-of-script-elements">script
348: content restrictions</a>.</dd>
349: <dt>Content attributes:</dt>
350: <dd><a href="elements.html#global-attributes">Global attributes</a></dd>
351: <dd><code title="attr-script-src"><a href="#attr-script-src">src</a></code></dd>
352: <dd><code title="attr-script-async"><a href="#attr-script-async">async</a></code></dd>
353: <dd><code title="attr-script-defer"><a href="#attr-script-defer">defer</a></code></dd>
354: <dd><code title="attr-script-type"><a href="#attr-script-type">type</a></code></dd>
355: <dd><code title="attr-script-charset"><a href="#attr-script-charset">charset</a></code></dd>
356: <dt>DOM interface:</dt>
357: <dd>
358: <pre class="idl">interface <dfn id="htmlscriptelement">HTMLScriptElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
1.46 mike 359: 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>;
360: 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>;
361: 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>;
362: 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>;
363: 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>;
364: 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 365: };</pre>
366: </dd>
367: </dl><p>The <code><a href="#script">script</a></code> element allows authors to include dynamic
368: script and data blocks in their documents. The element does not
1.46 mike 369: <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 370: embedded inline or may be imported from an external file using the
371: <code title="attr-script-src"><a href="#attr-script-src">src</a></code> attribute. If the language
372: is not that described by "<code title="">text/javascript</code>",
373: then the <code title="attr-script-type"><a href="#attr-script-type">type</a></code> attribute must
1.46 mike 374: be present, as described below.<p>When used to include data blocks (as opposed to scripts), the
1.22 mike 375: data must be embedded inline, the format of the data must be given
376: using the <code title="attr-script-type"><a href="#attr-script-type">type</a></code> attribute, and
377: the <code title="attr-script-src"><a href="#attr-script-src">src</a></code> attribute must not be
1.46 mike 378: specified.<p>The <dfn id="attr-script-type" title="attr-script-type"><code>type</code></dfn>
1.11 mike 379: attribute gives the language of the script or format of the data. If
380: the attribute is present, its value must be a <a href="infrastructure.html#valid-mime-type">valid MIME
1.12 mike 381: type</a>. The <code title="">charset</code> parameter must not be
1.14 mike 382: specified. The default, which is used if the attribute is absent,
1.46 mike 383: is "<code title="">text/javascript</code>".<p>The <dfn id="attr-script-src" title="attr-script-src"><code>src</code></dfn>
1.11 mike 384: attribute, if specified, gives the address of the external script
1.31 mike 385: resource to use. The value of the attribute must be a <a href="urls.html#valid-non-empty-url-potentially-surrounded-by-spaces">valid
386: non-empty URL potentially surrounded by spaces</a> identifying a
387: script resource of the type given by the <code title="attr-script-type"><a href="#attr-script-type">type</a></code> attribute, if the attribute is
388: present, or of the type "<code title="">text/javascript</code>", if
389: the attribute is absent. A resource is a script resource of a given
390: type if that type identifies a scripting language and the resource
1.46 mike 391: 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 392: attribute gives the character encoding of the external script
393: resource. The attribute must not be specified if the <code title="attr-script-src"><a href="#attr-script-src">src</a></code> attribute is not present. If the
394: attribute is set, its value must be a valid character encoding name,
395: must be an <a href="infrastructure.html#ascii-case-insensitive">ASCII case-insensitive</a> match for the
396: <a href="infrastructure.html#preferred-mime-name">preferred MIME name</a> for that encoding, and must match
397: the encoding given in the <code title="">charset</code> parameter of
1.46 mike 398: 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
399: 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 400: <dfn id="attr-script-defer" title="attr-script-defer"><code>defer</code></dfn> attributes
401: are <a href="common-microsyntaxes.html#boolean-attribute" title="boolean attribute">boolean attributes</a> that
1.29 mike 402: indicate how the script should be executed. The <code title="attr-script-defer"><a href="#attr-script-defer">defer</a></code> and <code title="attr-script-async"><a href="#attr-script-async">async</a></code> attributes must not be
403: specified if the <code title="attr-script-src"><a href="#attr-script-src">src</a></code> attribute
1.46 mike 404: is not present.<p>There are three possible modes that can be selected using these
1.11 mike 405: attributes. If the <code title="attr-script-async"><a href="#attr-script-async">async</a></code>
406: attribute is present, then the script will be executed
407: asynchronously, as soon as it is available. If the <code title="attr-script-async"><a href="#attr-script-async">async</a></code> attribute is not present but
408: the <code title="attr-script-defer"><a href="#attr-script-defer">defer</a></code> attribute is
409: present, then the script is executed when the page has finished
410: parsing. If neither attribute is present, then the script is
411: fetched and executed immediately, before the user agent continues
1.46 mike 412: parsing the page.<p class="note">The exact processing details for these attributes
1.20 mike 413: are, for mostly historical reasons, somewhat non-trivial, involving
414: a number of aspects of HTML. The implementation requirements are
415: therefore by necessity scattered throughout the specification. The
416: algorithms below (in this section) describe the core of this
417: processing, but these algorithms reference and are referenced by the
1.46 mike 418: parsing rules for <code><a href="#script">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>
419: 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
420: handling of <a href="webappapis.html#scripting">scripting</a>, etc.<p>The <code title="attr-script-defer"><a href="#attr-script-defer">defer</a></code> attribute may be
1.11 mike 421: specified even if the <code title="attr-script-async"><a href="#attr-script-async">async</a></code>
422: attribute is specified, to cause legacy Web browsers that only
423: support <code title="attr-script-defer"><a href="#attr-script-defer">defer</a></code> (and not <code title="attr-script-async"><a href="#attr-script-async">async</a></code>) to fall back to the <code title="attr-script-defer"><a href="#attr-script-defer">defer</a></code> behavior instead of the
1.46 mike 424: synchronous blocking behavior that is the default.<p>Changing the <code title="attr-script-src"><a href="#attr-script-src">src</a></code>, <code title="attr-script-type"><a href="#attr-script-type">type</a></code>, <code title="attr-script-charset"><a href="#attr-script-charset">charset</a></code>, <code title="attr-script-async"><a href="#attr-script-async">async</a></code>, and <code title="attr-script-defer"><a href="#attr-script-defer">defer</a></code> attributes dynamically has no
1.12 mike 425: direct effect; these attribute are only used at specific times
426: described below.</p><!-- by implication, changes to the base URL
1.46 mike 427: 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 428:
429: <dd>
430:
431: <p>Returns the contents of the element, ignoring child nodes that
432: aren't <a href="infrastructure.html#text-node" title="text node">text nodes</a>.</p>
433:
434: <p>Can be set, to replace the element's children with the given
435: value.</p>
436:
437: </dd>
438:
1.46 mike 439: </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,
1.11 mike 440: <code><a href="#script">script</a></code> elements execute (typically synchronously), but
441: when inserted using <code title="dom-innerHTML"><a href="apis-in-html-documents.html#dom-innerhtml">innerHTML</a></code> and <code title="dom-outerHTML"><a href="apis-in-html-documents.html#dom-outerhtml">outerHTML</a></code> attributes, they do not
1.46 mike 442: execute at all.<div class="example">
1.11 mike 443:
444: <p>In this example, two <code><a href="#script">script</a></code> elements are used. One
445: embeds an external script, and the other includes some data.</p>
446:
447: <pre><script src="game-engine.js"></script>
448: <script type="text/x-game-map">
449: ........U.........e
450: o............A....e
451: .....A.....AAA....e
452: .A..AAA...AAAAA...e
453: </script></pre>
454:
455: <p>The data in this case might be used by the script to generate
456: the map of a video game. The data doesn't have to be used that way,
457: though; maybe the map data is actually embedded in other parts of
458: the page's markup, and the data block here is just used by the
459: site's search engine to help users who are looking for particular
460: features in their game maps.</p>
461:
462: </div><div class="example">
463:
464: <p>The following sample shows how a script element can be used to
465: define a function that is then used by other parts of the
466: document. It also shows how a <code><a href="#script">script</a></code> element can be
467: used to invoke script while the document is being parsed, in this
468: case to initialize the form's output.</p>
469:
470: <pre><script>
471: function calculate(form) {
472: var price = 52000;
473: if (form.elements.brakes.checked)
474: price += 1000;
475: if (form.elements.radio.checked)
476: price += 2500;
477: if (form.elements.turbo.checked)
478: price += 5000;
479: if (form.elements.sticker.checked)
480: price += 250;
481: form.elements.result.value = price;
482: }
483: </script>
484: <form name="pricecalc" onsubmit="return false">
485: <fieldset>
486: <legend>Work out the price of your car</legend>
1.46 mike 487: <p>Base cost: £52000.</p>
1.11 mike 488: <p>Select additional options:</p>
489: <ul>
1.46 mike 490: <li><label><input type=checkbox name=brakes> Ceramic brakes (£1000)</label></li>
491: <li><label><input type=checkbox name=radio> Satellite radio (£2500)</label></li>
492: <li><label><input type=checkbox name=turbo> Turbo charger (£5000)</label></li>
493: <li><label><input type=checkbox name=sticker> "XZ" sticker (£250)</label></li>
1.11 mike 494: </ul>
1.46 mike 495: <p>Total: £<output name=result onformchange="calculate(form)"></output></p>
1.11 mike 496: </fieldset>
497: <script>
498: document.forms.pricecalc.dispatchFormChange();
499: </script>
500: </form></pre>
501:
1.46 mike 502: </div><h5 id="scriptingLanguages"><span class="secno">4.3.1.1 </span>Scripting languages</h5><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i><p>The following lists some <a href="infrastructure.html#mime-type">MIME type</a> strings and the
503: languages to which they refer:<dl><dt>"<code>application/ecmascript</code>"</dt>
1.11 mike 504: <dt>"<code>application/javascript</code>"</dt>
505: <dt>"<code>application/x-ecmascript</code>"</dt>
506: <dt>"<code>application/x-javascript</code>"</dt>
507: <dt>"<code>text/ecmascript</code>"</dt>
508: <dt>"<code>text/javascript</code>"</dt>
509: <dt>"<code>text/javascript1.0</code>"</dt>
510: <dt>"<code>text/javascript1.1</code>"</dt>
511: <dt>"<code>text/javascript1.2</code>"</dt>
512: <dt>"<code>text/javascript1.3</code>"</dt>
513: <dt>"<code>text/javascript1.4</code>"</dt>
514: <dt>"<code>text/javascript1.5</code>"</dt>
515: <dt>"<code>text/jscript</code>"</dt>
516: <dt>"<code>text/livescript</code>"</dt>
517: <dt>"<code>text/x-ecmascript</code>"</dt>
518: <dt>"<code>text/x-javascript</code>"</dt>
1.26 mike 519: <dd>JavaScript. <a href="references.html#refsECMA262">[ECMA262]</a></dd>
1.11 mike 520:
521: <dt>"<code>text/javascript;e4x=1</code>"</dt>
1.26 mike 522: <dd>JavaScript with ECMAScript for XML. <a href="references.html#refsECMA357">[ECMA357]</a></dd>
1.11 mike 523:
1.46 mike 524: </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 class="XXX annotation"><b>Status: </b><i>Last call for comments</i><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">script</a></code> element must match the
1.11 mike 525: <code title="">script</code> production in the following ABNF, the
1.46 mike 526: 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 527: escape = "<!--" data2 *( script-start data3 script-end data2 )
528:
529: data1 = <any string that doesn't contain a substring that matches not-data1>
530: not-data1 = <!-- script-end / -->"<!--" <!-- the script-end is redundant here since it would close the element -->
531:
532: data2 = <any string that doesn't contain a substring that matches not-data2>
533: not-data2 = <!-- script-end / -->script-start / "-->" <!-- the script-end is redundant here since it would close the element -->
534:
535: data3 = <any string that doesn't contain a substring that matches not-data3>
536: not-data3 = script-end / "-->"
537:
538: script-start = lt s c r i p t tag-end
539: script-end = lt slash s c r i p t tag-end
540:
541: lt = %x003C ; U+003C LESS-THAN SIGN character (<)
542: slash = %x002F ; U+002F SOLIDUS character (/)
543:
544: s = %x0053 ; U+0053 LATIN CAPITAL LETTER S
545: s =/ %x0073 ; U+0073 LATIN SMALL LETTER S
546: c = %x0043 ; U+0043 LATIN CAPITAL LETTER C
547: c =/ %x0063 ; U+0063 LATIN SMALL LETTER C
548: r = %x0052 ; U+0052 LATIN CAPITAL LETTER R
549: r =/ %x0072 ; U+0072 LATIN SMALL LETTER R
550: i = %x0049 ; U+0049 LATIN CAPITAL LETTER I
551: i =/ %x0069 ; U+0069 LATIN SMALL LETTER I
552: p = %x0050 ; U+0050 LATIN CAPITAL LETTER P
553: p =/ %x0070 ; U+0070 LATIN SMALL LETTER P
554: t = %x0054 ; U+0054 LATIN CAPITAL LETTER T
555: t =/ %x0074 ; U+0074 LATIN SMALL LETTER T
556:
557: tag-end = %x0009 ; U+0009 CHARACTER TABULATION
558: tag-end =/ %x000A ; U+000A LINE FEED (LF)
559: tag-end =/ %x000C ; U+000C FORM FEED (FF)
560: tag-end =/ %x0020 ; U+0020 SPACE
561: tag-end =/ %x002F ; U+002F SOLIDUS (/)
562: tag-end =/ %x003E ; U+003E GREATER-THAN SIGN (>)</pre><p>When a <code><a href="#script">script</a></code> element contains <a href="#inline-documentation-for-external-scripts">script
563: documentation</a>, there are further restrictions on the contents
1.46 mike 564: 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 class="XXX annotation"><b>Status: </b><i>Last call for comments</i><p>If a <code><a href="#script">script</a></code> element's <code title="attr-script-src"><a href="#attr-script-src">src</a></code> attribute is specified, then the
1.11 mike 565: contents of the <code><a href="#script">script</a></code> element, if any, must be such
1.46 mike 566: 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 567: attribute, which is derived from the element's contents, matches the
568: <code title="">documentation</code> production in the following
1.46 mike 569: 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 570: comment = slash star *( not-star / star not-slash ) 1*star slash
571: line-comment = slash slash *not-newline
572:
573: ; characters
574: tab = %x0009 ; U+0009 TAB
575: newline = %x000A ; U+000A LINE FEED (LF)
576: space = %x0020 ; U+0020 SPACE
577: star = %x002A ; U+002A ASTERISK (*)
578: slash = %x002F ; U+002F SOLIDUS (/)
579: not-newline = %x0000-0009 / %x000B-10FFFF
580: ; a Unicode character other than U+000A LINE FEED (LF)
581: not-star = %x0000-0029 / %x002B-10FFFF
582: ; a Unicode character other than U+002A ASTERISK (*)
583: not-slash = %x0000-002E / %x0030-10FFFF
584: ; a Unicode character other than U+002F SOLIDUS (/)</pre><p class="note">This corresponds to putting the contents of the
1.46 mike 585: element in JavaScript comments.<p class="note">This requirement is in addition to the earlier
1.11 mike 586: restrictions on the syntax of contents of <code><a href="#script">script</a></code>
1.46 mike 587: elements.<div class="example">
1.11 mike 588:
589: <p>This allows authors to include documentation, such as license
590: information or API information, inside their documents while still
591: referring to external script files. The syntax is constrained so
592: that authors don't accidentally include what looks like valid
593: script while also providing a <code title="attr-script-src"><a href="#attr-script-src">src</a></code> attribute.</p>
594:
595: <pre><script src="cool-effects.js">
596: // create new instances using:
597: // var e = new Effect();
598: // start the effect using .play, stop using .stop:
599: // e.play();
600: // e.stop();
601: </script></pre>
602:
1.46 mike 603: </div><h4 id="the-noscript-element"><span class="secno">4.3.2 </span>The <dfn><code>noscript</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i><dl class="element"><dt>Categories</dt>
1.11 mike 604: <dd><a href="content-models.html#metadata-content">Metadata content</a>.</dd>
605: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
606: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
607: <dt>Contexts in which this element may be used:</dt>
608: <dd>In a <code><a href="semantics.html#the-head-element-0">head</a></code> element of an <a href="dom.html#html-documents" title="HTML documents">HTML document</a>, if there are no ancestor <code><a href="#the-noscript-element">noscript</a></code> elements.</dd>
609: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected in <a href="dom.html#html-documents">HTML documents</a>, if there are no ancestor <code><a href="#the-noscript-element">noscript</a></code> elements.</dd>
610: <dt>Content model:</dt>
1.46 mike 611: <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">head</a></code> element: in any order, zero or more <code><a href="semantics.html#the-link-element">link</a></code> elements, zero or more <code><a href="semantics.html#the-style-element">style</a></code> elements, and zero or more <code><a href="semantics.html#meta">meta</a></code> elements.</dd>
612: <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">head</a></code> element: <a href="content-models.html#transparent">transparent</a>, but there must be no <code><a href="#the-noscript-element">noscript</a></code> element descendants.</dd>
1.11 mike 613: <dd>Otherwise: text that conforms to the requirements given in the prose.</dd>
614: <dt>Content attributes:</dt>
615: <dd><a href="elements.html#global-attributes">Global attributes</a></dd>
616: <dt>DOM interface:</dt>
617: <dd>Uses <code><a href="elements.html#htmlelement">HTMLElement</a></code>.</dd>
1.46 mike 618: </dl><p>The <code><a href="#the-noscript-element">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
619: 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
620: <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 621: to present different markup to user agents that support scripting
622: and those that don't support scripting, by affecting how the
1.46 mike 623: document is parsed.<p>When used in <a href="dom.html#html-documents">HTML documents</a>, the allowed content
624: model is as follows:<dl><dt>In a <code><a href="semantics.html#the-head-element-0">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
1.11 mike 625: <code><a href="#the-noscript-element">noscript</a></code> element</dt>
626:
627: <dd><p>The <code><a href="#the-noscript-element">noscript</a></code> element must contain only
628: <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="semantics.html#the-style-element">style</a></code>, and <code><a href="semantics.html#meta">meta</a></code>
1.46 mike 629: elements.</dd>
1.11 mike 630:
1.46 mike 631: <dt>In a <code><a href="semantics.html#the-head-element-0">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
1.11 mike 632: <code><a href="#the-noscript-element">noscript</a></code> element</dt>
633:
634: <dd><p>The <code><a href="#the-noscript-element">noscript</a></code> element must contain only text,
1.46 mike 635: 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 636: algorithm</a> <!-- (which disables <script type="text/javascript"> execution) --> with
1.11 mike 637: the <code><a href="#the-noscript-element">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
638: only of <code><a href="semantics.html#the-link-element">link</a></code>, <code><a href="semantics.html#the-style-element">style</a></code>, and
639: <code><a href="semantics.html#meta">meta</a></code> elements that would be conforming if they were
1.46 mike 640: children of the <code><a href="#the-noscript-element">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>
1.11 mike 641:
1.46 mike 642: <dt>Outside of <code><a href="semantics.html#the-head-element-0">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
1.11 mike 643: <code><a href="#the-noscript-element">noscript</a></code> element</dt>
644:
645: <dd><p>The <code><a href="#the-noscript-element">noscript</a></code> element's content model is
646: <a href="content-models.html#transparent">transparent</a>, with the additional restriction that a
647: <code><a href="#the-noscript-element">noscript</a></code> element must not have a <code><a href="#the-noscript-element">noscript</a></code>
648: element as an ancestor (that is, <code><a href="#the-noscript-element">noscript</a></code> can't be
1.46 mike 649: nested).</dd>
1.11 mike 650:
1.46 mike 651: <dt>Outside of <code><a href="semantics.html#the-head-element-0">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
1.11 mike 652: <code><a href="#the-noscript-element">noscript</a></code> element</dt>
653:
654: <dd>
655:
656: <p>The <code><a href="#the-noscript-element">noscript</a></code> element must contain only text,
657: except that the text must be such that running the following
658: algorithm results in a conforming document with no
659: <code><a href="#the-noscript-element">noscript</a></code> elements and no <code><a href="#script">script</a></code>
660: elements, and such that no step in the algorithm causes an
1.46 mike 661: <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 662:
663: <ol><li>Remove every <code><a href="#script">script</a></code> element from the
664: document.</li>
665:
666: <li>Make a list of every <code><a href="#the-noscript-element">noscript</a></code> element in the
667: document. For every <code><a href="#the-noscript-element">noscript</a></code> element in that list,
668: perform the following steps:
669:
670: <ol><li>Let the <var title="">parent element</var> be the parent
671: element of the <code><a href="#the-noscript-element">noscript</a></code> element.</li>
672:
673: <li>Take all the children of the <var title="">parent element</var>
674: that come before the <code><a href="#the-noscript-element">noscript</a></code> element, and call these
675: elements <var title="">the before children</var>.</li>
676:
677: <li>Take all the children of the <var title="">parent element</var>
678: that come <em>after</em> the <code><a href="#the-noscript-element">noscript</a></code> element, and
679: call these elements <var title="">the after children</var>.</li>
680:
681: <li>Let <var title="">s</var> be the concatenation of all the
682: <a href="infrastructure.html#text-node">text node</a> children of the <code><a href="#the-noscript-element">noscript</a></code>
683: element.</li>
684:
685: <li>Set the <code title="dom-innerHTML"><a href="apis-in-html-documents.html#dom-innerhtml">innerHTML</a></code>
686: attribute of the <var title="">parent element</var> to the value
687: of <var title="">s</var>. (This, as a side-effect, causes the
688: <code><a href="#the-noscript-element">noscript</a></code> element to be removed from the
689: document.)</li>
690:
691: <li>Insert <var title="">the before children</var> at the start of
692: the <var title="">parent element</var>, preserving their original
693: relative order.</li>
694:
695: <li>Insert <var title="">the after children</var> at the end of the
696: <var title="">parent element</var>, preserving their original
697: relative order.</li>
698:
699: </ol></li>
700:
701: </ol></dd>
702:
703: </dl><p class="note">All these contortions are required because, for
704: historical reasons, the <code><a href="#the-noscript-element">noscript</a></code> element is handled
1.46 mike 705: 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
706: parser was invoked.<p>The <code><a href="#the-noscript-element">noscript</a></code> element must not be used in <a href="dom.html#xml-documents">XML
707: documents</a>.<p class="note"><strong>The <code><a href="#the-noscript-element">noscript</a></code> element is only
1.11 mike 708: effective in <a href="syntax.html#syntax">the HTML syntax</a>, it has no effect in
1.46 mike 709: <a href="the-xhtml-syntax.html#the-xhtml-syntax">the XHTML syntax</a>.</strong><div class="example">
1.11 mike 710:
711: <p>In the following example, a <code><a href="#the-noscript-element">noscript</a></code> element is
712: used to provide fallback for a script.</p>
713:
714: <pre><form action="calcSquare.php">
715: <p>
716: <label for=x>Number</label>:
717: <input id="x" name="x" type="number">
718: </p>
719: <script>
720: var x = document.getElementById('x');
721: var output = document.createElement('p');
722: output.textContent = 'Type a number; it will be squared right then!';
723: x.form.appendChild(output);
724: x.form.onsubmit = function () { return false; }
725: x.oninput = function () {
726: var v = x.valueAsNumber;
727: output.textContent = v + ' squared is ' + v * v;
728: };
729: </script>
730: <noscript>
731: <input type=submit value="Calculate Square">
732: </noscript>
733: </form></pre>
734:
735: <p>When script is disabled, a button appears to do the calculation
736: on the server side. When script is enabled, the value is computed
737: on-the-fly instead.</p>
738:
739: <p>The <code><a href="#the-noscript-element">noscript</a></code> element is a blunt
740: instrument. Sometimes, scripts might be enabled, but for some
741: reason the page's script might fail. For this reason, it's
742: generally better to avoid using <code><a href="#the-noscript-element">noscript</a></code>, and to
743: instead design the script to change the page from being a
744: scriptless page to a scripted page on the fly, as in the next
745: example:</p>
746:
747: <pre><form action="calcSquare.php">
748: <p>
749: <label for=x>Number</label>:
750: <input id="x" name="x" type="number">
751: </p>
752: <strong><input id="submit" type=submit value="Calculate Square"></strong>
753: <script>
754: var x = document.getElementById('x');
755: var output = document.createElement('p');
756: output.textContent = 'Type a number; it will be squared right then!';
757: x.form.appendChild(output);
758: x.form.onsubmit = function () { return false; }
759: x.oninput = function () {
760: var v = x.valueAsNumber;
761: output.textContent = v + ' squared is ' + v * v;
762: };
763: <strong> var submit = document.getElementById('submit');
764: submit.parentNode.removeChild(submit);</strong>
765: </script>
766: </form></pre>
767:
768: <p>The above technique is also useful in XHTML, since
1.26 mike 769: <code><a href="#the-noscript-element">noscript</a></code> is not supported in <a href="the-xhtml-syntax.html#the-xhtml-syntax">the XHTML
1.11 mike 770: syntax</a>.</p>
771:
1.46 mike 772: </div>
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