Annotation of html5/spec-author-view/scripting-1.html, revision 1.355
1.351 mike 1: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"><!-- when publishing, change bits marked ZZZ
2: ZZZ: Set PUB to 1 for TR/ drafts, 0 for dev drafts; PUB-Y lines are used if it's 1 and PUB-N lines if it's 0.
3: ZZZ: Set YEAR, SHORTDAY (month/day), and LONGDAY accordingly. They are used by the INSERT FOO bits below.
4: --><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;" 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 5: pre { margin-left: 2em; white-space: pre-wrap; }
6: h2 { margin: 3em 0 1em 0; }
7: h3 { margin: 2.5em 0 1em 0; }
8: h4 { margin: 2.5em 0 0.75em 0; }
9: h5, h6 { margin: 2.5em 0 1em; }
10: h1 + h2, h1 + h2 + h2 { margin: 0.75em 0 0.75em; }
11: h2 + h3, h3 + h4, h4 + h5, h5 + h6 { margin-top: 0.5em; }
12: p { margin: 1em 0; }
13: hr:not(.top) { display: block; background: none; border: none; padding: 0; margin: 2em 0; height: auto; }
14: dl, dd { margin-top: 0; margin-bottom: 0; }
15: dt { margin-top: 0.75em; margin-bottom: 0.25em; clear: left; }
16: dt + dt { margin-top: 0; }
17: dd dt { margin-top: 0.25em; margin-bottom: 0; }
18: dd p { margin-top: 0; }
19: dd dl + p { margin-top: 1em; }
20: dd table + p { margin-top: 1em; }
21: p + * > li, dd li { margin: 1em 0; }
22: dt, dfn { font-weight: bold; font-style: normal; }
23: dt dfn { font-style: italic; }
24: pre, code { font-size: inherit; font-family: monospace; font-variant: normal; }
25: pre strong { color: black; font: inherit; font-weight: bold; background: yellow; }
26: pre em { font-weight: bolder; font-style: normal; }
27: @media screen { code { color: orangered; } code :link, code :visited { color: inherit; } }
28: var sub { vertical-align: bottom; font-size: smaller; position: relative; top: 0.1em; }
29: table { border-collapse: collapse; border-style: hidden hidden none hidden; }
1.32 mike 30: table thead, table tbody { border-bottom: solid; }
1.9 mike 31: table tbody th:first-child { border-left: solid; }
32: table tbody th { text-align: left; }
33: table td, table th { border-left: solid; border-right: solid; border-bottom: solid thin; vertical-align: top; padding: 0.2em; }
34: blockquote { margin: 0 0 0 2em; border: 0; padding: 0; font-style: italic; }
35:
36: .bad, .bad *:not(.XXX) { color: gray; border-color: gray; background: transparent; }
37: .matrix, .matrix td { border: none; text-align: right; }
38: .matrix { margin-left: 2em; }
39: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
40: .dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
41: .dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
42:
43: .toc dfn, h1 dfn, h2 dfn, h3 dfn, h4 dfn, h5 dfn, h6 dfn { font: inherit; }
44: img.extra { float: right; }
45: pre.idl { border: solid thin; background: #EEEEEE; color: black; padding: 0.5em 1em; }
46: pre.idl :link, pre.idl :visited { color: inherit; background: transparent; }
47: pre.css { border: solid thin; background: #FFFFEE; color: black; padding: 0.5em 1em; }
48: pre.css:first-line { color: #AAAA50; }
1.17 mike 49: dl.domintro { color: green; margin: 2em 0 2em 2em; padding: 0.5em 1em; border: none; background: #DDFFDD; }
1.9 mike 50: hr + dl.domintro, div.impl + dl.domintro { margin-top: 2.5em; margin-bottom: 1.5em; }
51: dl.domintro dt, dl.domintro dt * { color: black; text-decoration: none; }
52: dl.domintro dd { margin: 0.5em 0 1em 2em; padding: 0; }
53: dl.domintro dd p { margin: 0.5em 0; }
54: dl.switch { padding-left: 2em; }
55: dl.switch > dt { text-indent: -1.5em; }
56: dl.switch > dt:before { content: '\21AA'; padding: 0 0.5em 0 0; display: inline-block; width: 1em; text-align: right; line-height: 0.5em; }
57: dl.triple { padding: 0 0 0 1em; }
58: dl.triple dt, dl.triple dd { margin: 0; display: inline }
59: dl.triple dt:after { content: ':'; }
60: dl.triple dd:after { content: '\A'; white-space: pre; }
61: .diff-old { text-decoration: line-through; color: silver; background: transparent; }
62: .diff-chg, .diff-new { text-decoration: underline; color: green; background: transparent; }
63: a .diff-new { border-bottom: 1px blue solid; }
64:
65: h2 { page-break-before: always; }
66: h1, h2, h3, h4, h5, h6 { page-break-after: avoid; }
67: h1 + h2, hr + h2.no-toc { page-break-before: auto; }
68:
1.303 mike 69: p > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]),
70: li > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]), { border-bottom: solid #9999CC; }
1.9 mike 71:
72: div.head { margin: 0 0 1em; padding: 1em 0 0 0; }
73: div.head p { margin: 0; }
74: div.head h1 { margin: 0; }
75: div.head .logo { float: right; margin: 0 1em; }
76: div.head .logo img { border: none } /* remove border from top image */
77: div.head dl { margin: 1em 0; }
78: div.head p.copyright, div.head p.alt { font-size: x-small; font-style: oblique; margin: 0; }
79:
80: body > .toc > li { margin-top: 1em; margin-bottom: 1em; }
81: body > .toc.brief > li { margin-top: 0.35em; margin-bottom: 0.35em; }
82: body > .toc > li > * { margin-bottom: 0.5em; }
83: body > .toc > li > * > li > * { margin-bottom: 0.25em; }
84: .toc, .toc li { list-style: none; }
85:
86: .brief { margin-top: 1em; margin-bottom: 1em; line-height: 1.1; }
87: .brief li { margin: 0; padding: 0; }
88: .brief li p { margin: 0; padding: 0; }
89:
90: .category-list { margin-top: -0.75em; margin-bottom: 1em; line-height: 1.5; }
91: .category-list::before { content: '\21D2\A0'; font-size: 1.2em; font-weight: 900; }
92: .category-list li { display: inline; }
93: .category-list li:not(:last-child)::after { content: ', '; }
94: .category-list li > span, .category-list li > a { text-transform: lowercase; }
95: .category-list li * { text-transform: none; } /* don't affect <code> nested in <a> */
96:
97: .XXX { color: #E50000; background: white; border: solid red; padding: 0.5em; margin: 1em 0; }
98: .XXX > :first-child { margin-top: 0; }
99: p .XXX { line-height: 3em; }
100: .annotation { border: solid thin black; background: #0C479D; color: white; position: relative; margin: 8px 0 20px 0; }
101: .annotation:before { position: absolute; left: 0; top: 0; width: 100%; height: 100%; margin: 6px -6px -6px 6px; background: #333333; z-index: -1; content: ''; }
102: .annotation :link, .annotation :visited { color: inherit; }
103: .annotation :link:hover, .annotation :visited:hover { background: transparent; }
104: .annotation span { border: none ! important; }
105: .note { color: green; background: transparent; font-family: sans-serif; }
106: .warning { color: red; background: transparent; }
107: .note, .warning { font-weight: bolder; font-style: italic; }
108: p.note, div.note { padding: 0.5em 2em; }
109: span.note { padding: 0 2em; }
110: .note p:first-child, .warning p:first-child { margin-top: 0; }
111: .note p:last-child, .warning p:last-child { margin-bottom: 0; }
112: .warning:before { font-style: normal; }
113: p.note:before { content: 'Note: '; }
114: p.warning:before { content: '\26A0 Warning! '; }
115:
116: .bookkeeping:before { display: block; content: 'Bookkeeping details'; font-weight: bolder; font-style: italic; }
117: .bookkeeping { font-size: 0.8em; margin: 2em 0; }
118: .bookkeeping p { margin: 0.5em 2em; display: list-item; list-style: square; }
1.130 mike 119: .bookkeeping dt { margin: 0.5em 2em 0; }
120: .bookkeeping dd { margin: 0 3em 0.5em; }
1.9 mike 121:
122: h4 { position: relative; z-index: 3; }
123: h4 + .element, h4 + div + .element { margin-top: -2.5em; padding-top: 2em; }
124: .element {
125: background: #EEEEFF;
126: color: black;
127: margin: 0 0 1em 0.15em;
128: padding: 0 1em 0.25em 0.75em;
129: border-left: solid #9999FF 0.25em;
130: position: relative;
131: z-index: 1;
132: }
133: .element:before {
134: position: absolute;
135: z-index: 2;
136: top: 0;
137: left: -1.15em;
138: height: 2em;
139: width: 0.9em;
140: background: #EEEEFF;
141: content: ' ';
142: border-style: none none solid solid;
143: border-color: #9999FF;
144: border-width: 0.25em;
145: }
146:
147: .example { display: block; color: #222222; background: #FCFCFC; border-left: double; margin-left: 2em; padding-left: 1em; }
148: td > .example:only-child { margin: 0 0 0 0.1em; }
149:
150: ul.domTree, ul.domTree ul { padding: 0 0 0 1em; margin: 0; }
151: ul.domTree li { padding: 0; margin: 0; list-style: none; position: relative; }
152: ul.domTree li li { list-style: none; }
153: 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; }
154: 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; }
155: ul.domTree span { font-style: italic; font-family: serif; }
156: ul.domTree .t1 code { color: purple; font-weight: bold; }
157: ul.domTree .t2 { font-style: normal; font-family: monospace; }
158: ul.domTree .t2 .name { color: black; font-weight: bold; }
159: ul.domTree .t2 .value { color: blue; font-weight: normal; }
160: ul.domTree .t3 code, .domTree .t4 code, .domTree .t5 code { color: gray; }
161: ul.domTree .t7 code, .domTree .t8 code { color: green; }
162: ul.domTree .t10 code { color: teal; }
163:
1.13 mike 164: body.dfnEnabled dfn { cursor: pointer; }
165: .dfnPanel {
166: display: inline;
167: position: absolute;
168: z-index: 10;
169: height: auto;
170: width: auto;
171: padding: 0.5em 0.75em;
172: font: small sans-serif, Droid Sans Fallback;
173: background: #DDDDDD;
174: color: black;
175: border: outset 0.2em;
176: }
177: .dfnPanel * { margin: 0; padding: 0; font: inherit; text-indent: 0; }
178: .dfnPanel :link, .dfnPanel :visited { color: black; }
179: .dfnPanel p { font-weight: bolder; }
180: .dfnPanel * + p { margin-top: 0.25em; }
181: .dfnPanel li { list-style-position: inside; }
182:
1.9 mike 183: #configUI { position: absolute; z-index: 20; top: 10em; right: 1em; width: 11em; font-size: small; }
184: #configUI p { margin: 0.5em 0; padding: 0.3em; background: #EEEEEE; color: black; border: inset thin; }
185: #configUI p label { display: block; }
186: #configUI #updateUI, #configUI .loginUI { text-align: center; }
187: #configUI input[type=button] { display: block; margin: auto; }
1.119 mike 188:
1.318 mike 189: fieldset { margin: 1em; padding: 0.5em 1em; }
190: fieldset > legend + * { margin-top: 0; }
1.290 mike 191: fieldset > :last-child { margin-bottom: 0; }
1.318 mike 192: fieldset p { margin: 0.5em 0; }
193:
194: .stability {
195: position: fixed;
196: bottom: 0;
197: left: 0; right: 0;
198: margin: 0 auto 0 auto;
199: width: 50%;
200: background: maroon; color: yellow;
201: -webkit-border-radius: 1em 1em 0 0;
202: -moz-border-radius: 1em 1em 0 0;
203: border-radius: 1em 1em 0 0;
204: -moz-box-shadow: 0 0 1em #500;
205: -webkit-box-shadow: 0 0 1em #500;
206: box-shadow: 0 0 1em red;
207: padding: 0.5em 1em;
208: text-align: center;
209: }
210: .stability strong {
211: display: block;
212: }
1.322 mike 213: .stability input {
214: appearance: none; margin: 0; border: 0; padding: 0.25em 0.5em; background: transparent; color: black;
215: position: absolute; top: -0.5em; right: 0; font: 1.25em sans-serif; text-align: center;
216: }
217: .stability input:hover {
218: color: white;
219: text-shadow: 0 0 2px black;
220: }
221: .stability input:active {
222: padding: 0.3em 0.45em 0.2em 0.55em;
223: }
1.318 mike 224: .stability :link, .stability :visited,
225: .stability :link:hover, .stability :visited:hover {
226: background: transparent;
227: color: white;
228: }
1.290 mike 229:
1.351 mike 230: </style><link href="http://www.w3.org/StyleSheets/TR/W3C-WD" rel="stylesheet" type="text/css"><link href="style.css" rel="stylesheet"><script src="link-fixup.js"></script><style type="text/css">
1.9 mike 231:
232: .applies thead th > * { display: block; }
233: .applies thead code { display: block; }
234: .applies tbody th { whitespace: nowrap; }
235: .applies td { text-align: center; }
236: .applies .yes { background: yellow; }
237:
1.134 mike 238: .matrix, .matrix td { border: hidden; text-align: right; }
1.9 mike 239: .matrix { margin-left: 2em; }
240:
241: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
242: .dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
243: .dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
244:
1.210 mike 245: td.eg { border-width: thin; text-align: center; }
246:
1.9 mike 247: #table-example-1 { border: solid thin; border-collapse: collapse; margin-left: 3em; }
248: #table-example-1 * { font-family: "Essays1743", serif; line-height: 1.01em; }
249: #table-example-1 caption { padding-bottom: 0.5em; }
250: #table-example-1 thead, #table-example-1 tbody { border: none; }
251: #table-example-1 th, #table-example-1 td { border: solid thin; }
252: #table-example-1 th { font-weight: normal; }
253: #table-example-1 td { border-style: none solid; vertical-align: top; }
254: #table-example-1 th { padding: 0.5em; vertical-align: middle; text-align: center; }
255: #table-example-1 tbody tr:first-child td { padding-top: 0.5em; }
256: #table-example-1 tbody tr:last-child td { padding-bottom: 1.5em; }
257: #table-example-1 tbody td:first-child { padding-left: 2.5em; padding-right: 0; width: 9em; }
258: #table-example-1 tbody td:first-child::after { content: leader(". "); }
259: #table-example-1 tbody td { padding-left: 2em; padding-right: 2em; }
260: #table-example-1 tbody td:first-child + td { width: 10em; }
261: #table-example-1 tbody td:first-child + td ~ td { width: 2.5em; }
262: #table-example-1 tbody td:first-child + td + td + td ~ td { width: 1.25em; }
263:
264: .apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
265: .apple-table-examples * { font-family: "Times", serif; }
266: .apple-table-examples td, .apple-table-examples th { border: none; white-space: nowrap; padding-top: 0; padding-bottom: 0; }
267: .apple-table-examples tbody th:first-child { border-left: none; width: 100%; }
268: .apple-table-examples thead th:first-child ~ th { font-size: smaller; font-weight: bolder; border-bottom: solid 2px; text-align: center; }
269: .apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
270: .apple-table-examples tbody th, .apple-table-examples tfoot th { font: inherit; text-align: left; }
271: .apple-table-examples td { text-align: right; vertical-align: top; }
272: .apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
1.11 mike 273: .apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
274: .apple-table-examples.e2 th[scope=row] { padding-left: 1em; }
275: .apple-table-examples sup { line-height: 0; }
276:
1.12 mike 277: .details-example img { vertical-align: top; }
278:
1.22 mike 279: #named-character-references-table {
1.254 mike 280: white-space: nowrap;
1.22 mike 281: font-size: 0.6em;
1.254 mike 282: column-width: 30em;
1.22 mike 283: column-gap: 1em;
1.254 mike 284: -moz-column-width: 30em;
1.22 mike 285: -moz-column-gap: 1em;
1.254 mike 286: -webkit-column-width: 30em;
1.22 mike 287: -webkit-column-gap: 1em;
288: }
1.254 mike 289: #named-character-references-table > table > tbody > tr > td:first-child + td,
1.22 mike 290: #named-character-references-table > table > tbody > tr > td:last-child { text-align: center; }
291: #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 292: #named-character-references-table > table > tbody > tr#entity-CounterClockwiseContourIntegral > td:first-child { font-size: 0.5em; }
1.22 mike 293:
1.33 mike 294: .glyph.control { color: red; }
295:
1.36 mike 296: @font-face {
297: font-family: 'Essays1743';
298: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743.ttf');
299: }
300: @font-face {
301: font-family: 'Essays1743';
302: font-weight: bold;
303: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Bold.ttf');
304: }
305: @font-face {
306: font-family: 'Essays1743';
307: font-style: italic;
308: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Italic.ttf');
309: }
310: @font-face {
311: font-family: 'Essays1743';
312: font-style: italic;
313: font-weight: bold;
314: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-BoldItalic.ttf');
315: }
316:
1.21 mike 317: </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 318: function getCookie(name) {
319: var params = location.search.substr(1).split("&");
320: for (var index = 0; index < params.length; index++) {
321: if (params[index] == name)
322: return "1";
323: var data = params[index].split("=");
324: if (data[0] == name)
325: return unescape(data[1]);
1.11 mike 326: }
1.155 mike 327: var cookies = document.cookie.split("; ");
328: for (var index = 0; index < cookies.length; index++) {
329: var data = cookies[index].split("=");
330: if (data[0] == name)
331: return unescape(data[1]);
1.11 mike 332: }
1.155 mike 333: return null;
334: }
335: function load(script) {
336: var e = document.createElement('script');
337: e.setAttribute('src', script + '?' + encodeURIComponent(location) + '&' + encodeURIComponent(document.referrer));
338: document.body.appendChild(e);
339: }
340: function init() {
341: if (location.search == '?slow-browser')
342: return;
343: var configUI = document.createElement('div');
344: configUI.id = 'configUI';
345: document.body.appendChild(configUI);
346: if (document.getElementById('head'))
347: load('toc.js');
348: load('dfn.js');
349: if (getCookie('profile') == '1')
350: document.getElementsByTagName('h2')[0].textContent += '; load: ' + (new Date() - loadTimer) + 'ms';
351: fixBrokenLink();
352: }
1.351 mike 353: </script><link href="semantics.html" rel="prev" title="4 The elements of HTML">
1.158 mike 354: <link href="Overview.html#contents" rel="index" title="Table of contents">
355: <link href="sections.html" rel="next" title="4.4 Sections">
356: <body onload="fixBrokenLink(); init()"><div class="head" id="head">
1.11 mike 357: <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 358:
1.355 ! mike 359: <h1>HTML5 <span class="edition">Edition for Web Authors</span> <span class="rcsrevision">revision 1.4588</span></h1>
1.11 mike 360: </div><div>
1.317 mike 361: <a href="semantics.html">← 4 The elements of HTML</a> –
1.158 mike 362: <a href="Overview.html#contents">Table of contents</a> –
1.317 mike 363: <a href="sections.html">4.4 Sections →</a>
1.11 mike 364: <ol class="toc"><li><ol><li><a href="scripting-1.html#scripting-1"><span class="secno">4.3 </span>Scripting</a>
1.154 mike 365: <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 366: <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 367:
1.199 mike 368: <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 369: scripting where possible, as declarative mechanisms are often more
1.158 mike 370: maintainable, and many users disable scripting.<div class="example">
1.11 mike 371: <p>For example, instead of using script to show or hide a section
1.174 mike 372: 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 373: used.</p>
374: </div><p>Authors are also encouraged to make their applications degrade
1.158 mike 375: gracefully in the absence of scripting support.<div class="example">
1.11 mike 376: <p>For example, if an author provides a link in a table header to
377: dynamically resort the table, the link could also be made to
378: function without scripts by requesting the sorted table from the
379: server.</p>
1.199 mike 380: </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 381: <dd><a href="content-models.html#metadata-content" id="metadata-content-13">Metadata content</a>.</dd>
1.200 mike 382: <dd><a href="content-models.html#flow-content" id="flow-content-12">Flow content</a>.</dd>
383: <dd><a href="content-models.html#phrasing-content" id="phrasing-content-16">Phrasing content</a>.</dd>
384: <dt>Contexts in which this element can be used:</dt>
1.154 mike 385: <dd>Where <a href="content-models.html#metadata-content" id="metadata-content-14">metadata content</a> is expected.</dd>
1.200 mike 386: <dd>Where <a href="content-models.html#phrasing-content" id="phrasing-content-17">phrasing content</a> is expected.</dd>
1.11 mike 387: <dt>Content model:</dt>
1.154 mike 388: <dd>If there is no <code title="attr-script-src"><a href="#attr-script-src" id="src-1">src</a></code>
1.184 mike 389: 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 390: <a href="#restrictions-for-contents-of-script-elements" id="script-content-restrictions">script content restrictions</a>.</dd>
391: <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 392: attribute, the element must be either empty or contain only
1.154 mike 393: <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 394: content restrictions</a>.</dd>
395: <dt>Content attributes:</dt>
1.154 mike 396: <dd><a href="elements.html#global-attributes" id="global-attributes-7">Global attributes</a></dd>
397: <dd><code title="attr-script-src"><a href="#attr-script-src" id="src-3">src</a></code></dd>
398: <dd><code title="attr-script-async"><a href="#attr-script-async" id="async">async</a></code></dd>
399: <dd><code title="attr-script-defer"><a href="#attr-script-defer" id="defer">defer</a></code></dd>
1.184 mike 400: <dd><code title="attr-script-type"><a href="#attr-script-type" id="type-7">type</a></code></dd>
1.154 mike 401: <dd><code title="attr-script-charset"><a href="#attr-script-charset" id="charset-10">charset</a></code></dd>
1.11 mike 402: <dt>DOM interface:</dt>
403: <dd>
1.154 mike 404: <pre class="idl">interface <dfn id="htmlscriptelement">HTMLScriptElement</dfn> : <a href="elements.html#htmlelement" id="htmlelement-14">HTMLElement</a> {
1.160 mike 405: 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>;
406: 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>;
407: 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>;
408: 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>;
409: 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>;
410: 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 411: };</pre>
412: </dd>
1.319 mike 413: </dl><p>The <code><a href="#script" id="script-14">script</a></code> element allows authors to include dynamic
1.11 mike 414: script and data blocks in their documents. The element does not
1.160 mike 415: <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 416: embedded inline or may be imported from an external file using the
1.154 mike 417: <code title="attr-script-src"><a href="#attr-script-src" id="src-4">src</a></code> attribute. If the language
1.11 mike 418: is not that described by "<code title="">text/javascript</code>",
1.184 mike 419: then the <code title="attr-script-type"><a href="#attr-script-type" id="type-8">type</a></code> attribute must
1.158 mike 420: be present, as described below.<p>When used to include data blocks (as opposed to scripts), the
1.22 mike 421: data must be embedded inline, the format of the data must be given
1.184 mike 422: using the <code title="attr-script-type"><a href="#attr-script-type" id="type-9">type</a></code> attribute, and
1.154 mike 423: the <code title="attr-script-src"><a href="#attr-script-src" id="src-5">src</a></code> attribute must not be
1.158 mike 424: specified.<p>The <dfn id="attr-script-type" title="attr-script-type"><code>type</code></dfn>
1.11 mike 425: attribute gives the language of the script or format of the data. If
1.154 mike 426: 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 427: type</a>. The <code title="">charset</code> parameter must not be
1.14 mike 428: specified. The default, which is used if the attribute is absent,
1.158 mike 429: is "<code title="">text/javascript</code>".<p>The <dfn id="attr-script-src" title="attr-script-src"><code>src</code></dfn>
1.11 mike 430: attribute, if specified, gives the address of the external script
1.154 mike 431: 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 432: non-empty URL potentially surrounded by spaces</a> identifying a
1.184 mike 433: 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 434: present, or of the type "<code title="">text/javascript</code>", if
435: the attribute is absent. A resource is a script resource of a given
436: type if that type identifies a scripting language and the resource
1.158 mike 437: 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 438: attribute gives the character encoding of the external script
1.154 mike 439: 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 440: attribute is set, its value must be a valid character encoding name,
1.165 mike 441: 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 442: <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 443: the encoding given in the <code title="">charset</code> parameter of
1.160 mike 444: 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 445: 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 446: <dfn id="attr-script-defer" title="attr-script-defer"><code>defer</code></dfn> attributes
1.154 mike 447: are <a href="common-microsyntaxes.html#boolean-attribute" id="boolean-attribute-1" title="boolean attribute">boolean attributes</a> that
448: 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
449: specified if the <code title="attr-script-src"><a href="#attr-script-src" id="src-7">src</a></code> attribute
1.158 mike 450: is not present.<p>There are three possible modes that can be selected using these
1.154 mike 451: attributes. If the <code title="attr-script-async"><a href="#attr-script-async" id="async-1">async</a></code>
1.11 mike 452: attribute is present, then the script will be executed
1.154 mike 453: 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
454: the <code title="attr-script-defer"><a href="#attr-script-defer" id="defer-1">defer</a></code> attribute is
1.11 mike 455: present, then the script is executed when the page has finished
456: parsing. If neither attribute is present, then the script is
457: fetched and executed immediately, before the user agent continues
1.158 mike 458: parsing the page.<p class="note">The exact processing details for these attributes
1.20 mike 459: are, for mostly historical reasons, somewhat non-trivial, involving
460: a number of aspects of HTML. The implementation requirements are
461: therefore by necessity scattered throughout the specification. The
462: algorithms below (in this section) describe the core of this
463: processing, but these algorithms reference and are referenced by the
1.319 mike 464: parsing rules for <code><a href="#script" id="script-15">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 465: 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 466: 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 467: specified even if the <code title="attr-script-async"><a href="#attr-script-async" id="async-3">async</a></code>
1.11 mike 468: attribute is specified, to cause legacy Web browsers that only
1.154 mike 469: 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 470: 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 471: direct effect; these attribute are only used at specific times
472: described below.</p><!-- by implication, changes to the base URL
1.160 mike 473: 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 474:
475: <dd>
476:
477: <p>Returns the contents of the element, ignoring child nodes that
1.319 mike 478: aren't <a href="infrastructure.html#text-node" id="text-node-9" title="text node">text nodes</a>.</p>
1.11 mike 479:
480: <p>Can be set, to replace the element's children with the given
481: value.</p>
482:
483: </dd>
484:
1.160 mike 485: </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,
1.319 mike 486: <code><a href="#script" id="script-16">script</a></code> elements execute (typically synchronously), but
1.154 mike 487: 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 488: execute at all.<div class="example">
1.11 mike 489:
1.319 mike 490: <p>In this example, two <code><a href="#script" id="script-17">script</a></code> elements are used. One
1.11 mike 491: embeds an external script, and the other includes some data.</p>
492:
493: <pre><script src="game-engine.js"></script>
494: <script type="text/x-game-map">
495: ........U.........e
496: o............A....e
497: .....A.....AAA....e
498: .A..AAA...AAAAA...e
499: </script></pre>
500:
501: <p>The data in this case might be used by the script to generate
502: the map of a video game. The data doesn't have to be used that way,
503: though; maybe the map data is actually embedded in other parts of
504: the page's markup, and the data block here is just used by the
505: site's search engine to help users who are looking for particular
506: features in their game maps.</p>
507:
508: </div><div class="example">
509:
510: <p>The following sample shows how a script element can be used to
511: define a function that is then used by other parts of the
1.319 mike 512: document. It also shows how a <code><a href="#script" id="script-18">script</a></code> element can be
1.11 mike 513: used to invoke script while the document is being parsed, in this
514: case to initialize the form's output.</p>
515:
516: <pre><script>
517: function calculate(form) {
518: var price = 52000;
519: if (form.elements.brakes.checked)
520: price += 1000;
521: if (form.elements.radio.checked)
522: price += 2500;
523: if (form.elements.turbo.checked)
524: price += 5000;
525: if (form.elements.sticker.checked)
526: price += 250;
527: form.elements.result.value = price;
528: }
529: </script>
530: <form name="pricecalc" onsubmit="return false">
531: <fieldset>
532: <legend>Work out the price of your car</legend>
1.158 mike 533: <p>Base cost: £52000.</p>
1.11 mike 534: <p>Select additional options:</p>
535: <ul>
1.158 mike 536: <li><label><input type=checkbox name=brakes> Ceramic brakes (£1000)</label></li>
537: <li><label><input type=checkbox name=radio> Satellite radio (£2500)</label></li>
538: <li><label><input type=checkbox name=turbo> Turbo charger (£5000)</label></li>
539: <li><label><input type=checkbox name=sticker> "XZ" sticker (£250)</label></li>
1.11 mike 540: </ul>
1.158 mike 541: <p>Total: £<output name=result onformchange="calculate(form)"></output></p>
1.11 mike 542: </fieldset>
543: <script>
544: document.forms.pricecalc.dispatchFormChange();
545: </script>
546: </form></pre>
547:
1.199 mike 548: </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 549: languages to which they refer:<dl><dt>"<code>application/ecmascript</code>"</dt>
1.11 mike 550: <dt>"<code>application/javascript</code>"</dt>
551: <dt>"<code>application/x-ecmascript</code>"</dt>
552: <dt>"<code>application/x-javascript</code>"</dt>
553: <dt>"<code>text/ecmascript</code>"</dt>
554: <dt>"<code>text/javascript</code>"</dt>
555: <dt>"<code>text/javascript1.0</code>"</dt>
556: <dt>"<code>text/javascript1.1</code>"</dt>
557: <dt>"<code>text/javascript1.2</code>"</dt>
558: <dt>"<code>text/javascript1.3</code>"</dt>
559: <dt>"<code>text/javascript1.4</code>"</dt>
560: <dt>"<code>text/javascript1.5</code>"</dt>
561: <dt>"<code>text/jscript</code>"</dt>
562: <dt>"<code>text/livescript</code>"</dt>
563: <dt>"<code>text/x-ecmascript</code>"</dt>
564: <dt>"<code>text/x-javascript</code>"</dt>
1.26 mike 565: <dd>JavaScript. <a href="references.html#refsECMA262">[ECMA262]</a></dd>
1.11 mike 566:
567: <dt>"<code>text/javascript;e4x=1</code>"</dt>
1.26 mike 568: <dd>JavaScript with ECMAScript for XML. <a href="references.html#refsECMA357">[ECMA357]</a></dd>
1.11 mike 569:
1.319 mike 570: </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-19">script</a></code> element must match the
1.11 mike 571: <code title="">script</code> production in the following ABNF, the
1.158 mike 572: 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 573: escape = "<!--" data2 *( script-start data3 script-end data2 )
574:
575: data1 = <any string that doesn't contain a substring that matches not-data1>
576: not-data1 = <!-- script-end / -->"<!--" <!-- the script-end is redundant here since it would close the element -->
577:
578: data2 = <any string that doesn't contain a substring that matches not-data2>
579: not-data2 = <!-- script-end / -->script-start / "-->" <!-- the script-end is redundant here since it would close the element -->
580:
581: data3 = <any string that doesn't contain a substring that matches not-data3>
582: not-data3 = script-end / "-->"
583:
584: script-start = lt s c r i p t tag-end
585: script-end = lt slash s c r i p t tag-end
586:
587: lt = %x003C ; U+003C LESS-THAN SIGN character (<)
588: slash = %x002F ; U+002F SOLIDUS character (/)
589:
590: s = %x0053 ; U+0053 LATIN CAPITAL LETTER S
591: s =/ %x0073 ; U+0073 LATIN SMALL LETTER S
592: c = %x0043 ; U+0043 LATIN CAPITAL LETTER C
593: c =/ %x0063 ; U+0063 LATIN SMALL LETTER C
594: r = %x0052 ; U+0052 LATIN CAPITAL LETTER R
595: r =/ %x0072 ; U+0072 LATIN SMALL LETTER R
596: i = %x0049 ; U+0049 LATIN CAPITAL LETTER I
597: i =/ %x0069 ; U+0069 LATIN SMALL LETTER I
598: p = %x0050 ; U+0050 LATIN CAPITAL LETTER P
599: p =/ %x0070 ; U+0070 LATIN SMALL LETTER P
600: t = %x0054 ; U+0054 LATIN CAPITAL LETTER T
601: t =/ %x0074 ; U+0074 LATIN SMALL LETTER T
602:
603: tag-end = %x0009 ; U+0009 CHARACTER TABULATION
604: tag-end =/ %x000A ; U+000A LINE FEED (LF)
605: tag-end =/ %x000C ; U+000C FORM FEED (FF)
606: tag-end =/ %x0020 ; U+0020 SPACE
607: tag-end =/ %x002F ; U+002F SOLIDUS (/)
1.319 mike 608: tag-end =/ %x003E ; U+003E GREATER-THAN SIGN (>)</pre><p>When a <code><a href="#script" id="script-20">script</a></code> element contains <a href="#inline-documentation-for-external-scripts" id="script-documentation-0">script
1.11 mike 609: documentation</a>, there are further restrictions on the contents
1.319 mike 610: 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-21">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
611: contents of the <code><a href="#script" id="script-22">script</a></code> element, if any, must be such
1.160 mike 612: 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 613: attribute, which is derived from the element's contents, matches the
614: <code title="">documentation</code> production in the following
1.158 mike 615: 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 616: comment = slash star *( not-star / star not-slash ) 1*star slash
617: line-comment = slash slash *not-newline
618:
619: ; characters
620: tab = %x0009 ; U+0009 TAB
621: newline = %x000A ; U+000A LINE FEED (LF)
622: space = %x0020 ; U+0020 SPACE
623: star = %x002A ; U+002A ASTERISK (*)
624: slash = %x002F ; U+002F SOLIDUS (/)
625: not-newline = %x0000-0009 / %x000B-10FFFF
626: ; a Unicode character other than U+000A LINE FEED (LF)
627: not-star = %x0000-0029 / %x002B-10FFFF
628: ; a Unicode character other than U+002A ASTERISK (*)
629: not-slash = %x0000-002E / %x0030-10FFFF
630: ; a Unicode character other than U+002F SOLIDUS (/)</pre><p class="note">This corresponds to putting the contents of the
1.158 mike 631: element in JavaScript comments.<p class="note">This requirement is in addition to the earlier
1.319 mike 632: restrictions on the syntax of contents of <code><a href="#script" id="script-23">script</a></code>
1.158 mike 633: elements.<div class="example">
1.11 mike 634:
635: <p>This allows authors to include documentation, such as license
636: information or API information, inside their documents while still
637: referring to external script files. The syntax is constrained so
638: that authors don't accidentally include what looks like valid
1.154 mike 639: 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 640:
641: <pre><script src="cool-effects.js">
642: // create new instances using:
643: // var e = new Effect();
644: // start the effect using .play, stop using .stop:
645: // e.play();
646: // e.stop();
647: </script></pre>
648:
1.246 mike 649: </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 650: <dd><a href="content-models.html#metadata-content" id="metadata-content-15">Metadata content</a>.</dd>
1.200 mike 651: <dd><a href="content-models.html#flow-content" id="flow-content-13">Flow content</a>.</dd>
652: <dd><a href="content-models.html#phrasing-content" id="phrasing-content-18">Phrasing content</a>.</dd>
653: <dt>Contexts in which this element can be used:</dt>
1.199 mike 654: <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 655: <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 656: <dt>Content model:</dt>
1.319 mike 657: <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-28">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 658: <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 659: <dd>Otherwise: text that conforms to the requirements given in the prose.</dd>
660: <dt>Content attributes:</dt>
1.154 mike 661: <dd><a href="elements.html#global-attributes" id="global-attributes-8">Global attributes</a></dd>
1.11 mike 662: <dt>DOM interface:</dt>
1.154 mike 663: <dd>Uses <code><a href="elements.html#htmlelement" id="htmlelement-15">HTMLElement</a></code>.</dd>
1.188 mike 664: </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 665: 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
666: <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 667: to present different markup to user agents that support scripting
668: and those that don't support scripting, by affecting how the
1.158 mike 669: 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 670: 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 671: <code><a href="#the-noscript-element" id="noscript-11">noscript</a></code> element</dt>
1.154 mike 672:
1.188 mike 673: <dd><p>The <code><a href="#the-noscript-element" id="noscript-12">noscript</a></code> element must contain only
1.319 mike 674: <code><a href="semantics.html#the-link-element" id="link-24">link</a></code>, <code><a href="semantics.html#the-style-element" id="style-29">style</a></code>, and <code><a href="semantics.html#meta" id="meta-29">meta</a></code>
1.158 mike 675: elements.</dd>
1.11 mike 676:
1.199 mike 677: <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 678: <code><a href="#the-noscript-element" id="noscript-13">noscript</a></code> element</dt>
1.11 mike 679:
1.188 mike 680: <dd><p>The <code><a href="#the-noscript-element" id="noscript-14">noscript</a></code> element must contain only text,
1.160 mike 681: 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 682: algorithm</a> <!-- (which disables <script type="text/javascript"> execution) --> with
1.188 mike 683: 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
1.319 mike 684: 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-30">style</a></code>, and
1.187 mike 685: <code><a href="semantics.html#meta" id="meta-30">meta</a></code> elements that would be conforming if they were
1.188 mike 686: 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 687:
1.199 mike 688: <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 689: <code><a href="#the-noscript-element" id="noscript-17">noscript</a></code> element</dt>
1.154 mike 690:
1.188 mike 691: <dd><p>The <code><a href="#the-noscript-element" id="noscript-18">noscript</a></code> element's content model is
1.154 mike 692: <a href="content-models.html#transparent" id="transparent-2">transparent</a>, with the additional restriction that a
1.188 mike 693: <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>
694: element as an ancestor (that is, <code><a href="#the-noscript-element" id="noscript-21">noscript</a></code> can't be
1.158 mike 695: nested).</dd>
1.11 mike 696:
1.199 mike 697: <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 698: <code><a href="#the-noscript-element" id="noscript-22">noscript</a></code> element</dt>
1.11 mike 699:
700: <dd>
701:
1.188 mike 702: <p>The <code><a href="#the-noscript-element" id="noscript-23">noscript</a></code> element must contain only text,
1.11 mike 703: except that the text must be such that running the following
704: algorithm results in a conforming document with no
1.319 mike 705: <code><a href="#the-noscript-element" id="noscript-24">noscript</a></code> elements and no <code><a href="#script" id="script-24">script</a></code>
1.11 mike 706: elements, and such that no step in the algorithm causes an
1.160 mike 707: <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 708:
1.319 mike 709: <ol><li>Remove every <code><a href="#script" id="script-25">script</a></code> element from the
1.11 mike 710: document.</li>
711:
1.188 mike 712: <li>Make a list of every <code><a href="#the-noscript-element" id="noscript-25">noscript</a></code> element in the
713: document. For every <code><a href="#the-noscript-element" id="noscript-26">noscript</a></code> element in that list,
1.11 mike 714: perform the following steps:
715:
716: <ol><li>Let the <var title="">parent element</var> be the parent
1.188 mike 717: element of the <code><a href="#the-noscript-element" id="noscript-27">noscript</a></code> element.</li>
1.11 mike 718:
719: <li>Take all the children of the <var title="">parent element</var>
1.188 mike 720: that come before the <code><a href="#the-noscript-element" id="noscript-28">noscript</a></code> element, and call these
1.11 mike 721: elements <var title="">the before children</var>.</li>
722:
723: <li>Take all the children of the <var title="">parent element</var>
1.188 mike 724: that come <em>after</em> the <code><a href="#the-noscript-element" id="noscript-29">noscript</a></code> element, and
1.11 mike 725: call these elements <var title="">the after children</var>.</li>
726:
727: <li>Let <var title="">s</var> be the concatenation of all the
1.319 mike 728: <a href="infrastructure.html#text-node" id="text-node-10">text node</a> children of the <code><a href="#the-noscript-element" id="noscript-30">noscript</a></code>
1.11 mike 729: element.</li>
730:
1.154 mike 731: <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 732: attribute of the <var title="">parent element</var> to the value
733: of <var title="">s</var>. (This, as a side-effect, causes the
1.188 mike 734: <code><a href="#the-noscript-element" id="noscript-31">noscript</a></code> element to be removed from the
1.11 mike 735: document.)</li>
736:
737: <li>Insert <var title="">the before children</var> at the start of
738: the <var title="">parent element</var>, preserving their original
739: relative order.</li>
740:
741: <li>Insert <var title="">the after children</var> at the end of the
742: <var title="">parent element</var>, preserving their original
743: relative order.</li>
744:
745: </ol></li>
746:
747: </ol></dd>
748:
749: </dl><p class="note">All these contortions are required because, for
1.188 mike 750: historical reasons, the <code><a href="#the-noscript-element" id="noscript-32">noscript</a></code> element is handled
1.160 mike 751: 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 752: 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 753: 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 754: effective in <a href="syntax.html#syntax" id="the-html-syntax-2">the HTML syntax</a>, it has no effect in
1.158 mike 755: <a href="the-xhtml-syntax.html#the-xhtml-syntax">the XHTML syntax</a>.</strong><div class="example">
1.11 mike 756:
1.188 mike 757: <p>In the following example, a <code><a href="#the-noscript-element" id="noscript-35">noscript</a></code> element is
1.11 mike 758: used to provide fallback for a script.</p>
759:
760: <pre><form action="calcSquare.php">
761: <p>
762: <label for=x>Number</label>:
763: <input id="x" name="x" type="number">
764: </p>
765: <script>
766: var x = document.getElementById('x');
767: var output = document.createElement('p');
768: output.textContent = 'Type a number; it will be squared right then!';
769: x.form.appendChild(output);
770: x.form.onsubmit = function () { return false; }
771: x.oninput = function () {
772: var v = x.valueAsNumber;
773: output.textContent = v + ' squared is ' + v * v;
774: };
775: </script>
776: <noscript>
777: <input type=submit value="Calculate Square">
778: </noscript>
779: </form></pre>
780:
781: <p>When script is disabled, a button appears to do the calculation
782: on the server side. When script is enabled, the value is computed
783: on-the-fly instead.</p>
784:
1.188 mike 785: <p>The <code><a href="#the-noscript-element" id="noscript-36">noscript</a></code> element is a blunt
1.11 mike 786: instrument. Sometimes, scripts might be enabled, but for some
787: reason the page's script might fail. For this reason, it's
1.188 mike 788: generally better to avoid using <code><a href="#the-noscript-element" id="noscript-37">noscript</a></code>, and to
1.11 mike 789: instead design the script to change the page from being a
790: scriptless page to a scripted page on the fly, as in the next
791: example:</p>
792:
793: <pre><form action="calcSquare.php">
794: <p>
795: <label for=x>Number</label>:
796: <input id="x" name="x" type="number">
797: </p>
798: <strong><input id="submit" type=submit value="Calculate Square"></strong>
799: <script>
800: var x = document.getElementById('x');
801: var output = document.createElement('p');
802: output.textContent = 'Type a number; it will be squared right then!';
803: x.form.appendChild(output);
804: x.form.onsubmit = function () { return false; }
805: x.oninput = function () {
806: var v = x.valueAsNumber;
807: output.textContent = v + ' squared is ' + v * v;
808: };
809: <strong> var submit = document.getElementById('submit');
810: submit.parentNode.removeChild(submit);</strong>
811: </script>
812: </form></pre>
813:
814: <p>The above technique is also useful in XHTML, since
1.188 mike 815: <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 816: syntax</a>.</p>
817:
1.158 mike 818: </div>
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