Annotation of html5/spec-author-view/the-noscript-element.html, revision 1.121
1.98 mike 1: <!doctype html>
1.115 mike 2: <html lang="en-US-x-Hixie"><meta content="text/html; charset=utf-8" http-equiv="Content-Type"><title>4.3.2 The noscript element — HTML5: Edition for Web Authors</title><link href="style.css" rel="stylesheet"><link href="http://www.w3.org/StyleSheets/TR/W3C-ED" rel="stylesheet" type="text/css"><script src="link-fixup.js" type="text/javascript"></script><style type="text/css">
1.1 mike 3:
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9:
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18:
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27: #table-example-1 tbody tr:first-child td { padding-top: 0.5em; }
28: #table-example-1 tbody tr:last-child td { padding-bottom: 1.5em; }
29: #table-example-1 tbody td:first-child { padding-left: 2.5em; padding-right: 0; width: 9em; }
30: #table-example-1 tbody td:first-child::after { content: leader(". "); }
31: #table-example-1 tbody td { padding-left: 2em; padding-right: 2em; }
32: #table-example-1 tbody td:first-child + td { width: 10em; }
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35:
36: .apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
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41: .apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
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43: .apple-table-examples td { text-align: right; vertical-align: top; }
44: .apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
45: .apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
46: .apple-table-examples.e2 th[scope=row] { padding-left: 1em; }
47: .apple-table-examples sup { line-height: 0; }
48:
49: .details-example img { vertical-align: top; }
50:
51: #base64-table {
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58: -moz-column-count: 5;
59: -moz-column-gap: 1em;
60: -webkit-column-width: 6em;
61: -webkit-column-count: 5;
62: -webkit-column-gap: 1em;
63: }
64: #base64-table thead { display: none; }
65: #base64-table * { border: none; }
66: #base64-table tbody td:first-child:after { content: ':'; }
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68:
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74: -moz-column-width: 30em;
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76: -webkit-column-width: 30em;
77: -webkit-column-gap: 1em;
78: }
79: #named-character-references-table > table > tbody > tr > td:first-child + td,
80: #named-character-references-table > table > tbody > tr > td:last-child { text-align: center; }
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83:
84: .glyph.control { color: red; }
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92: font-weight: bold;
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102: font-style: italic;
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105: }
106:
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1.99 mike 143: </script><script src="dfn.js" type="text/javascript"></script><script src="toc.js" type="text/javascript"></script><link href="the-script-element.html" rel="prev" title="4.3.1 The script element">
144: <link href="Overview.html#contents" rel="contents" title="Table of contents">
1.91 mike 145: <link href="sections.html" rel="next" title="4.4 Sections">
1.99 mike 146: <body class="split chapter"><div class="head" id="head">
1.9 mike 147: <div aria-haspopup="true" id="jumpIndexA-button" role="button" tabindex="0">jump
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href="the-thead-element.html#the-thead-element">thead</a><a class="noindex" href="the-time-element.html#the-time-element">time</a><a class="noindex" href="the-title-element.html#the-title-element">title</a></ul><ul><li><a class="noindex" href="the-tr-element.html#the-tr-element">tr</a><a class="noindex" href="the-track-element.html#the-track-element">track</a><a class="noindex" href="the-u-element.html#the-u-element">u</a><a class="noindex" href="the-ul-element.html#the-ul-element">ul</a><a class="noindex" href="the-var-element.html#the-var-element">var</a><a class="noindex" href="the-video-element.html#the-video-element">video</a><a class="noindex" href="the-wbr-element.html#the-wbr-element">wbr</a></ul><ul class="jumpIndexA-other"><li><a class="noindex" href="global-attributes.html#global-attributes">global attributes</a><a class="noindex" href="index-of-terms.html#index-of-terms">terms</a></ul></div></div>
1.11 mike 149: <script src="jump-indexes.js"></script><p><a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a></p>
1.1 mike 150:
1.91 mike 151: <h1>HTML5: Edition for Web Authors</h1>
152:
153: </div><div class="prev_next">
154: <a href="the-script-element.html">← 4.3.1 The script element</a> –
1.1 mike 155: <a href="Overview.html#contents">Table of contents</a> –
1.91 mike 156: <a href="sections.html">4.4 Sections →</a>
1.1 mike 157: </div>
158:
1.91 mike 159: <h4 id="the-noscript-element"><span class="secno">4.3.2 </span>The <dfn aria-haspopup="true" role="button" tabindex="0"><code>noscript</code></dfn> element</h4><dl class="element"><dt>Categories</dt>
1.1 mike 160: <dd><a href="content-models.html#metadata-content" id="metadata-content_14">Metadata content</a>.</dd>
1.116 mike 161: <dd><a href="content-models.html#flow-content" id="flow-content_15">Flow content</a>.</dd>
162: <dd><a href="content-models.html#phrasing-content" id="phrasing-content_22">Phrasing content</a>.</dd>
1.1 mike 163: <dt>Contexts in which this element can be used:</dt>
1.102 mike 164: <dd>In a <code><a href="the-head-element.html#the-head-element" id="head_19">head</a></code> element of an <a class="full-spec-link" href="http://dev.w3.org/html5/spec/infrastructure.html#html-documents" title='Read about this "HTML document" reference in the full HTML5 spec.'>HTML document</a>, if there are no ancestor <code><a href="#the-noscript-element" id="noscript_7">noscript</a></code> elements.</dd>
1.116 mike 165: <dd>Where <a href="content-models.html#phrasing-content" id="phrasing-content_23">phrasing content</a> is expected in <a class="full-spec-link" href="http://dev.w3.org/html5/spec/infrastructure.html#html-documents" title='Read about this "HTML documents" reference in the full HTML5 spec.'>HTML documents</a>, if there are no ancestor <code><a href="#the-noscript-element" id="noscript_8">noscript</a></code> elements.</dd>
1.1 mike 166: <dt>Content model:</dt>
1.111 mike 167: <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="the-head-element.html#the-head-element" id="head_20">head</a></code> element: in any order, zero or more <code><a href="the-link-element.html#the-link-element" id="link_24">link</a></code> elements, zero or more <code><a href="the-style-element.html#the-style-element" id="style_29">style</a></code> elements, and zero or more <code><a href="the-meta-element.html#the-meta-element" id="meta_28">meta</a></code> elements.</dd>
1.116 mike 168: <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="the-head-element.html#the-head-element" id="head_21">head</a></code> element: <a href="content-models.html#transparent" id="transparent_3">transparent</a>, but there must be no <code><a href="#the-noscript-element" id="noscript_9">noscript</a></code> element descendants.</dd>
1.1 mike 169: <dd>Otherwise: text that conforms to the requirements given in the prose.</dd>
170: <dt>Content attributes:</dt>
1.6 mike 171: <dd><a href="global-attributes.html#global-attributes" id="global-attributes_8">Global attributes</a></dd>
1.1 mike 172: <dt>DOM interface:</dt>
1.105 mike 173: <dd>Uses <code><a href="elements.html#htmlelement" id="htmlelement_14">HTMLElement</a></code>.</dd>
1.110 mike 174: </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
1.99 mike 175: 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
1.110 mike 176: <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
1.1 mike 177: to present different markup to user agents that support scripting
178: and those that don't support scripting, by affecting how the
1.102 mike 179: document is parsed.<p>When used in <a class="full-spec-link" href="http://dev.w3.org/html5/spec/infrastructure.html#html-documents" title='Read about this "HTML documents" reference in the full HTML5 spec.'>HTML documents</a>, the allowed content
1.99 mike 180: model is as follows:<dl><dt>In a <code><a href="the-head-element.html#the-head-element" 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
1.1 mike 181: <code><a href="#the-noscript-element" id="noscript_11">noscript</a></code> element</dt>
182:
183: <dd><p>The <code><a href="#the-noscript-element" id="noscript_12">noscript</a></code> element must contain only
1.111 mike 184: <code><a href="the-link-element.html#the-link-element" id="link_25">link</a></code>, <code><a href="the-style-element.html#the-style-element" id="style_30">style</a></code>, and <code><a href="the-meta-element.html#the-meta-element" id="meta_29">meta</a></code>
1.1 mike 185: elements.</dd>
186:
1.99 mike 187: <dt>In a <code><a href="the-head-element.html#the-head-element" 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
1.1 mike 188: <code><a href="#the-noscript-element" id="noscript_13">noscript</a></code> element</dt>
189:
190: <dd><p>The <code><a href="#the-noscript-element" id="noscript_14">noscript</a></code> element must contain only text,
1.110 mike 191: 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
1.1 mike 192: algorithm</a> with
1.110 mike 193: the <code><a href="#the-noscript-element" id="noscript_15">noscript</a></code> element as the <var title="concept-frag-parse-context"><a class="full-spec-link" href="http://dev.w3.org/html5/spec/the-end.html#concept-frag-parse-context" title='Read about this "context" reference in the full HTML5 spec.'>context</a></var> element and the
1.1 mike 194: text contents as the <var title="">input</var> must result in a
1.110 mike 195: list of nodes that consists only of <code><a href="the-link-element.html#the-link-element" id="link_26">link</a></code>,
1.111 mike 196: <code><a href="the-style-element.html#the-style-element" id="style_31">style</a></code>, and <code><a href="the-meta-element.html#the-meta-element" id="meta_30">meta</a></code> elements that would be
1.1 mike 197: conforming if they were children of the <code><a href="#the-noscript-element" id="noscript_16">noscript</a></code>
1.110 mike 198: 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
1.1 mike 199: errors</a>.</dd>
200:
1.99 mike 201: <dt>Outside of <code><a href="the-head-element.html#the-head-element" 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
1.1 mike 202: <code><a href="#the-noscript-element" id="noscript_17">noscript</a></code> element</dt>
203:
204: <dd><p>The <code><a href="#the-noscript-element" id="noscript_18">noscript</a></code> element's content model is
1.116 mike 205: <a href="content-models.html#transparent" id="transparent_4">transparent</a>, with the additional restriction that a
1.1 mike 206: <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>
207: element as an ancestor (that is, <code><a href="#the-noscript-element" id="noscript_21">noscript</a></code> can't be
208: nested).</dd>
209:
1.99 mike 210: <dt>Outside of <code><a href="the-head-element.html#the-head-element" 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
1.1 mike 211: <code><a href="#the-noscript-element" id="noscript_22">noscript</a></code> element</dt>
212:
213: <dd>
214:
215: <p>The <code><a href="#the-noscript-element" id="noscript_23">noscript</a></code> element must contain only text,
216: except that the text must be such that running the following
217: algorithm results in a conforming document with no
1.121 ! mike 218: <code><a href="#the-noscript-element" id="noscript_24">noscript</a></code> elements and no <code><a href="the-script-element.html#the-script-element" id="script_26">script</a></code>
1.1 mike 219: elements, and such that no step in the algorithm causes an
1.110 mike 220: <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>
1.1 mike 221:
1.121 ! mike 222: <ol><li>Remove every <code><a href="the-script-element.html#the-script-element" id="script_27">script</a></code> element from the
1.1 mike 223: document.</li>
224:
225: <li>Make a list of every <code><a href="#the-noscript-element" id="noscript_25">noscript</a></code> element in the
226: document. For every <code><a href="#the-noscript-element" id="noscript_26">noscript</a></code> element in that list,
227: perform the following steps:
228:
229: <ol><li>Let the <var title="">parent element</var> be the parent
230: element of the <code><a href="#the-noscript-element" id="noscript_27">noscript</a></code> element.</li>
231:
232: <li>Take all the children of the <var title="">parent element</var>
233: that come before the <code><a href="#the-noscript-element" id="noscript_28">noscript</a></code> element, and call these
234: elements <var title="">the before children</var>.</li>
235:
236: <li>Take all the children of the <var title="">parent element</var>
237: that come <em>after</em> the <code><a href="#the-noscript-element" id="noscript_29">noscript</a></code> element, and
238: call these elements <var title="">the after children</var>.</li>
239:
240: <li>Let <var title="">s</var> be the concatenation of all the
1.116 mike 241: <a href="infrastructure.html#text-node" id="text-node_11">text node</a> children of the <code><a href="#the-noscript-element" id="noscript_30">noscript</a></code>
1.1 mike 242: element.</li>
243:
1.117 mike 244: <li>Set the <code title="dom-innerHTML"><a class="full-spec-link" href="http://dev.w3.org/html5/spec/infrastructure.html#dom-innerhtml" title='Read about this "innerHTML" reference in the full HTML5 spec.'>innerHTML</a></code>
1.1 mike 245: attribute of the <var title="">parent element</var> to the value
246: of <var title="">s</var>. (This, as a side-effect, causes the
247: <code><a href="#the-noscript-element" id="noscript_31">noscript</a></code> element to be removed from the
248: document.)</li>
249:
250: <li>Insert <var title="">the before children</var> at the start of
251: the <var title="">parent element</var>, preserving their original
252: relative order.</li>
253:
254: <li>Insert <var title="">the after children</var> at the end of the
255: <var title="">parent element</var>, preserving their original
256: relative order.</li>
257:
258: </ol></li>
259:
260: </ol></dd>
261:
262: </dl><p class="note">All these contortions are required because, for
263: historical reasons, the <code><a href="#the-noscript-element" id="noscript_32">noscript</a></code> element is handled
1.110 mike 264: 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
1.102 mike 265: parser was invoked.<p>The <code><a href="#the-noscript-element" id="noscript_33">noscript</a></code> element must not be used in <a class="full-spec-link" href="http://dev.w3.org/html5/spec/infrastructure.html#xml-documents" title='Read about this "XML documents" reference in the full HTML5 spec.'>XML
1.99 mike 266: documents</a>.<p class="note">The <code><a href="#the-noscript-element" id="noscript_34">noscript</a></code> element is only effective
1.118 mike 267: in <a href="syntax.html#syntax" id="the-html-syntax_3">the HTML syntax</a>, it has no effect in <a href="the-xhtml-syntax.html#the-xhtml-syntax">the XHTML
1.99 mike 268: syntax</a>. This is because the way it works is by essentially
269: "turning off" the parser when scripts are enabled, so that the
270: contents of the element are treated as pure text and not as real
271: elements. XML does not define a mechanism by which to do this.<div class="example">
1.1 mike 272:
273: <p>In the following example, a <code><a href="#the-noscript-element" id="noscript_35">noscript</a></code> element is
274: used to provide fallback for a script.</p>
275:
276: <pre><form action="calcSquare.php">
277: <p>
278: <label for=x>Number</label>:
279: <input id="x" name="x" type="number">
280: </p>
281: <script>
282: var x = document.getElementById('x');
283: var output = document.createElement('p');
284: output.textContent = 'Type a number; it will be squared right then!';
285: x.form.appendChild(output);
286: x.form.onsubmit = function () { return false; }
287: x.oninput = function () {
288: var v = x.valueAsNumber;
289: output.textContent = v + ' squared is ' + v * v;
290: };
291: </script>
292: <noscript>
293: <input type=submit value="Calculate Square">
294: </noscript>
295: </form></pre>
296:
297: <p>When script is disabled, a button appears to do the calculation
298: on the server side. When script is enabled, the value is computed
299: on-the-fly instead.</p>
300:
301: <p>The <code><a href="#the-noscript-element" id="noscript_36">noscript</a></code> element is a blunt
302: instrument. Sometimes, scripts might be enabled, but for some
303: reason the page's script might fail. For this reason, it's
304: generally better to avoid using <code><a href="#the-noscript-element" id="noscript_37">noscript</a></code>, and to
305: instead design the script to change the page from being a
306: scriptless page to a scripted page on the fly, as in the next
307: example:</p>
308:
309: <pre><form action="calcSquare.php">
310: <p>
311: <label for=x>Number</label>:
312: <input id="x" name="x" type="number">
313: </p>
314: <strong><input id="submit" type=submit value="Calculate Square"></strong>
315: <script>
316: var x = document.getElementById('x');
317: var output = document.createElement('p');
318: output.textContent = 'Type a number; it will be squared right then!';
319: x.form.appendChild(output);
320: x.form.onsubmit = function () { return false; }
321: x.oninput = function () {
322: var v = x.valueAsNumber;
323: output.textContent = v + ' squared is ' + v * v;
324: };
325: <strong> var submit = document.getElementById('submit');
326: submit.parentNode.removeChild(submit);</strong>
327: </script>
328: </form></pre>
329:
330: <p>The above technique is also useful in XHTML, since
1.110 mike 331: <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
1.1 mike 332: syntax</a>.</p>
333:
334: </div>
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