dom.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en-US-x-Hixie" ><head><title>3 Semantics, structure, and APIs of HTML documents — HTML5 </title><style type="text/css">
pre { margin-left: 2em; white-space: pre-wrap; }
h2 { margin: 3em 0 1em 0; }
h3 { margin: 2.5em 0 1em 0; }
h4 { margin: 2.5em 0 0.75em 0; }
h5, h6 { margin: 2.5em 0 1em; }
h1 + h2, h1 + h2 + h2 { margin: 0.75em 0 0.75em; }
h2 + h3, h3 + h4, h4 + h5, h5 + h6 { margin-top: 0.5em; }
p { margin: 1em 0; }
hr:not(.top) { display: block; background: none; border: none; padding: 0; margin: 2em 0; height: auto; }
dl, dd { margin-top: 0; margin-bottom: 0; }
dt { margin-top: 0.75em; margin-bottom: 0.25em; clear: left; }
dt + dt { margin-top: 0; }
dd dt { margin-top: 0.25em; margin-bottom: 0; }
dd p { margin-top: 0; }
dd dl + p { margin-top: 1em; }
dd table + p { margin-top: 1em; }
p + * > li, dd li { margin: 1em 0; }
dt, dfn { font-weight: bold; font-style: normal; }
dt dfn { font-style: italic; }
pre, code { font-size: inherit; font-family: monospace; font-variant: normal; }
pre strong { color: black; font: inherit; font-weight: bold; background: yellow; }
pre em { font-weight: bolder; font-style: normal; }
@media screen { code { color: orangered; } code :link, code :visited { color: inherit; } }
var sub { vertical-align: bottom; font-size: smaller; position: relative; top: 0.1em; }
table { border-collapse: collapse; border-style: hidden hidden none hidden; }
table thead, table tbody { border-bottom: solid; }
table tbody th:first-child { border-left: solid; }
table tbody th { text-align: left; }
table td, table th { border-left: solid; border-right: solid; border-bottom: solid thin; vertical-align: top; padding: 0.2em; }
blockquote { margin: 0 0 0 2em; border: 0; padding: 0; font-style: italic; }
.bad, .bad *:not(.XXX) { color: gray; border-color: gray; background: transparent; }
.matrix, .matrix td { border: none; text-align: right; }
.matrix { margin-left: 2em; }
.dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
.dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
.dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
.toc dfn, h1 dfn, h2 dfn, h3 dfn, h4 dfn, h5 dfn, h6 dfn { font: inherit; }
img.extra { float: right; }
pre.idl { border: solid thin; background: #EEEEEE; color: black; padding: 0.5em 1em; }
pre.idl :link, pre.idl :visited { color: inherit; background: transparent; }
pre.css { border: solid thin; background: #FFFFEE; color: black; padding: 0.5em 1em; }
pre.css:first-line { color: #AAAA50; }
dl.domintro { color: green; margin: 2em 0 2em 2em; padding: 0.5em 1em; border: none; background: #DDFFDD; }
hr + dl.domintro, div.impl + dl.domintro { margin-top: 2.5em; margin-bottom: 1.5em; }
dl.domintro dt, dl.domintro dt * { color: black; text-decoration: none; }
dl.domintro dd { margin: 0.5em 0 1em 2em; padding: 0; }
dl.domintro dd p { margin: 0.5em 0; }
dl.switch { padding-left: 2em; }
dl.switch > dt { text-indent: -1.5em; }
dl.switch > dt:before { content: '\21AA'; padding: 0 0.5em 0 0; display: inline-block; width: 1em; text-align: right; line-height: 0.5em; }
dl.triple { padding: 0 0 0 1em; }
dl.triple dt, dl.triple dd { margin: 0; display: inline }
dl.triple dt:after { content: ':'; }
dl.triple dd:after { content: '\A'; white-space: pre; }
.diff-old { text-decoration: line-through; color: silver; background: transparent; }
.diff-chg, .diff-new { text-decoration: underline; color: green; background: transparent; }
a .diff-new { border-bottom: 1px blue solid; }
h2 { page-break-before: always; }
h1, h2, h3, h4, h5, h6 { page-break-after: avoid; }
h1 + h2, hr + h2.no-toc { page-break-before: auto; }
p > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]),
li > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]), { border-bottom: solid #9999CC; }
div.head { margin: 0 0 1em; padding: 1em 0 0 0; }
div.head p { margin: 0; }
div.head h1 { margin: 0; }
div.head .logo { float: right; margin: 0 1em; }
div.head .logo img { border: none } /* remove border from top image */
div.head dl { margin: 1em 0; }
div.head p.copyright, div.head p.alt { font-size: x-small; font-style: oblique; margin: 0; }
body > .toc > li { margin-top: 1em; margin-bottom: 1em; }
body > .toc.brief > li { margin-top: 0.35em; margin-bottom: 0.35em; }
body > .toc > li > * { margin-bottom: 0.5em; }
body > .toc > li > * > li > * { margin-bottom: 0.25em; }
.toc, .toc li { list-style: none; }
.brief { margin-top: 1em; margin-bottom: 1em; line-height: 1.1; }
.brief li { margin: 0; padding: 0; }
.brief li p { margin: 0; padding: 0; }
.category-list { margin-top: -0.75em; margin-bottom: 1em; line-height: 1.5; }
.category-list::before { content: '\21D2\A0'; font-size: 1.2em; font-weight: 900; }
.category-list li { display: inline; }
.category-list li:not(:last-child)::after { content: ', '; }
.category-list li > span, .category-list li > a { text-transform: lowercase; }
.category-list li * { text-transform: none; } /* don't affect <code> nested in <a> */
.XXX { color: #E50000; background: white; border: solid red; padding: 0.5em; margin: 1em 0; }
.XXX > :first-child { margin-top: 0; }
p .XXX { line-height: 3em; }
.annotation { border: solid thin black; background: #0C479D; color: white; position: relative; margin: 8px 0 20px 0; }
.annotation:before { position: absolute; left: 0; top: 0; width: 100%; height: 100%; margin: 6px -6px -6px 6px; background: #333333; z-index: -1; content: ''; }
.annotation :link, .annotation :visited { color: inherit; }
.annotation :link:hover, .annotation :visited:hover { background: transparent; }
.annotation span { border: none ! important; }
.note { color: green; background: transparent; font-family: sans-serif; }
.warning { color: red; background: transparent; }
.note, .warning { font-weight: bolder; font-style: italic; }
p.note, div.note { padding: 0.5em 2em; }
span.note { padding: 0 2em; }
.note p:first-child, .warning p:first-child { margin-top: 0; }
.note p:last-child, .warning p:last-child { margin-bottom: 0; }
.warning:before { font-style: normal; }
p.note:before { content: 'Note: '; }
p.warning:before { content: '\26A0 Warning! '; }
.bookkeeping:before { display: block; content: 'Bookkeeping details'; font-weight: bolder; font-style: italic; }
.bookkeeping { font-size: 0.8em; margin: 2em 0; }
.bookkeeping p { margin: 0.5em 2em; display: list-item; list-style: square; }
.bookkeeping dt { margin: 0.5em 2em 0; }
.bookkeeping dd { margin: 0 3em 0.5em; }
h4 { position: relative; z-index: 3; }
h4 + .element, h4 + div + .element { margin-top: -2.5em; padding-top: 2em; }
.element {
background: #EEEEFF;
color: black;
margin: 0 0 1em 0.15em;
padding: 0 1em 0.25em 0.75em;
border-left: solid #9999FF 0.25em;
position: relative;
z-index: 1;
}
.element:before {
position: absolute;
z-index: 2;
top: 0;
left: -1.15em;
height: 2em;
width: 0.9em;
background: #EEEEFF;
content: ' ';
border-style: none none solid solid;
border-color: #9999FF;
border-width: 0.25em;
}
.example { display: block; color: #222222; background: #FCFCFC; border-left: double; margin-left: 2em; padding-left: 1em; }
td > .example:only-child { margin: 0 0 0 0.1em; }
ul.domTree, ul.domTree ul { padding: 0 0 0 1em; margin: 0; }
ul.domTree li { padding: 0; margin: 0; list-style: none; position: relative; }
ul.domTree li li { list-style: none; }
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; }
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; }
ul.domTree span { font-style: italic; font-family: serif; }
ul.domTree .t1 code { color: purple; font-weight: bold; }
ul.domTree .t2 { font-style: normal; font-family: monospace; }
ul.domTree .t2 .name { color: black; font-weight: bold; }
ul.domTree .t2 .value { color: blue; font-weight: normal; }
ul.domTree .t3 code, .domTree .t4 code, .domTree .t5 code { color: gray; }
ul.domTree .t7 code, .domTree .t8 code { color: green; }
ul.domTree .t10 code { color: teal; }
body.dfnEnabled dfn { cursor: pointer; }
.dfnPanel {
display: inline;
position: absolute;
z-index: 10;
height: auto;
width: auto;
padding: 0.5em 0.75em;
font: small sans-serif, Droid Sans Fallback;
background: #DDDDDD;
color: black;
border: outset 0.2em;
}
.dfnPanel * { margin: 0; padding: 0; font: inherit; text-indent: 0; }
.dfnPanel :link, .dfnPanel :visited { color: black; }
.dfnPanel p { font-weight: bolder; }
.dfnPanel * + p { margin-top: 0.25em; }
.dfnPanel li { list-style-position: inside; }
#configUI { position: absolute; z-index: 20; top: 10em; right: 1em; width: 11em; font-size: small; }
#configUI p { margin: 0.5em 0; padding: 0.3em; background: #EEEEEE; color: black; border: inset thin; }
#configUI p label { display: block; }
#configUI #updateUI, #configUI .loginUI { text-align: center; }
#configUI input[type=button] { display: block; margin: auto; }
fieldset { margin: 1em; padding: 0.5em 1em; }
fieldset > legend + * { margin-top: 0; }
fieldset > :last-child { margin-bottom: 0; }
fieldset p { margin: 0.5em 0; }
.stability {
position: fixed;
bottom: 0;
left: 0; right: 0;
margin: 0 auto 0 auto !important;
z-index: 1000;
width: 50%;
background: maroon; color: yellow;
-webkit-border-radius: 1em 1em 0 0;
-moz-border-radius: 1em 1em 0 0;
border-radius: 1em 1em 0 0;
-moz-box-shadow: 0 0 1em #500;
-webkit-box-shadow: 0 0 1em #500;
box-shadow: 0 0 1em red;
padding: 0.5em 1em;
text-align: center;
}
.stability strong {
display: block;
}
.stability input {
appearance: none; margin: 0; border: 0; padding: 0.25em 0.5em; background: transparent; color: black;
position: absolute; top: -0.5em; right: 0; font: 1.25em sans-serif; text-align: center;
}
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font-family: 'Essays1743';
src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743.ttf');
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@font-face {
font-family: 'Essays1743';
font-weight: bold;
src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Bold.ttf');
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@font-face {
font-family: 'Essays1743';
font-style: italic;
src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Italic.ttf');
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@font-face {
font-family: 'Essays1743';
font-style: italic;
font-weight: bold;
src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-BoldItalic.ttf');
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<p class="stability" id="wip"><strong>This is a work in
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including important bug fixes, please look at the <a href="http://dev.w3.org/html5/spec/Overview.html">editor's draft</a> instead.
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<h1>HTML5</h1>
</div><div>
<a href="namespaces.html" class="prev">2.9 Namespaces</a> –
<a href="spec.html#contents">Table of contents</a> –
<a href="elements.html" class="next">3.2 Elements</a>
<ol class="toc"><li><a href="dom.html#dom"><span class="secno">3 </span>Semantics, structure, and APIs of HTML documents</a>
<ol><li><a href="dom.html#documents"><span class="secno">3.1 </span>Documents</a>
<ol><li><a href="dom.html#documents-in-the-dom"><span class="secno">3.1.1 </span>Documents in the DOM</a></li><li><a href="dom.html#security-document"><span class="secno">3.1.2 </span>Security</a></li><li><a href="dom.html#resource-metadata-management"><span class="secno">3.1.3 </span>Resource metadata management</a></li><li><a href="dom.html#dom-tree-accessors"><span class="secno">3.1.4 </span>DOM tree accessors</a></li><li><a href="dom.html#creating-documents"><span class="secno">3.1.5 </span>Creating documents</a></li><li><a href="dom.html#loading-xml-documents"><span class="secno">3.1.6 </span>Loading XML documents</a></li></ol></li></ol></li></ol></div>
<h2 id="dom"><span class="secno">3 </span>Semantics, structure, and APIs of HTML documents</h2><h3 id="documents"><span class="secno">3.1 </span>Documents</h3><p>Every XML and HTML document in an HTML UA is represented by a
<code><a href="infrastructure.html#document">Document</a></code> object. <a href="references.html#refsDOMCORE">[DOMCORE]</a></p><p><dfn id="the-document-s-address">The document's address</dfn> is an <a href="urls.html#absolute-url">absolute URL</a>
that is set when the <code><a href="infrastructure.html#document">Document</a></code> is created. <dfn id="the-document-s-current-address">The
document's current address</dfn> is an <a href="urls.html#absolute-url">absolute URL</a>
that can change during the lifetime of the <code><a href="infrastructure.html#document">Document</a></code>,
for example when the user <a href="history.html#navigate" title="navigate">navigates</a> to
a <a href="history.html#scroll-to-fragid" title="navigate-fragid">fragment identifier</a> on the
page or when the <code title="dom-history-pushState"><a href="history.html#dom-history-pushstate">pushState()</a></code> method is called
with a new <a href="urls.html#url">URL</a>. <span class="impl"><a href="#the-document-s-current-address">The document's
current address</a> must be set to <a href="#the-document-s-address">the document's
address</a> when the <code><a href="infrastructure.html#document">Document</a></code> is created.</span></p><p class="note">Interactive user agents typically expose <a href="#the-document-s-current-address">the
document's current address</a> in their user interface.</p><p>When a <code><a href="infrastructure.html#document">Document</a></code> is created by a <a href="webappapis.html#concept-script" title="concept-script">script</a> using the <code title="dom-DOMImplementation-createDocument"><a href="infrastructure.html#dom-domimplementation-createdocument">createDocument()</a></code>
or <code title="dom-DOMHTMLImplementation-createHTMLDocument"><a href="#dom-domhtmlimplementation-createhtmldocument">createHTMLDocument()</a></code>
APIs, <a href="#the-document-s-address">the document's address</a> is the same as <a href="#the-document-s-address">the
document's address</a> of the <a href="webappapis.html#script-s-document">script's document</a>.</p><p><code><a href="infrastructure.html#document">Document</a></code> objects are assumed to be <dfn id="xml-documents">XML
documents</dfn> unless they are flagged as being <dfn id="html-documents">HTML
documents</dfn> when they are created. Whether a document is an
<a href="#html-documents" title="HTML documents">HTML document</a> or an <a href="#xml-documents" title="XML documents">XML document</a> affects the behavior of
certain APIs and the case-sensitivity of some selectors.</p><p>Each <code><a href="infrastructure.html#document">Document</a></code> object has a <dfn id="reload-override-flag">reload override
flag</dfn> that is originally unset. The flag is set by the <code title="dom-document-open"><a href="apis-in-html-documents.html#dom-document-open">document.open()</a></code> and <code title="dom-document-open"><a href="apis-in-html-documents.html#dom-document-open">document.write()</a></code> methods in certain
situations. When the flag is set, the <code><a href="infrastructure.html#document">Document</a></code> also has
a <dfn id="reload-override-buffer">reload override buffer</dfn> which is a Unicode string that
is used as the source of the document when it is reloaded.</p><p>When the user agent is to perform <dfn id="an-overridden-reload">an overridden
reload</dfn>, it must act as follows:</p><ol><li><p>Let <var title="">source</var> be the value of the
<a href="browsers.html#browsing-context">browsing context</a>'s <a href="browsers.html#active-document">active document</a>'s
<a href="#reload-override-buffer">reload override buffer</a>.</p></li>
<li><p><a href="history.html#navigate">Navigate</a> the
<a href="browsers.html#browsing-context">browsing context</a> to a resource whose source is <var title="">source</var>, with <a href="history.html#replacement-enabled">replacement enabled</a>. When
the <a href="history.html#navigate">navigate</a> algorithm creates a <code><a href="infrastructure.html#document">Document</a></code>
object for this purpose, set that <code><a href="infrastructure.html#document">Document</a></code>'s
<a href="#reload-override-flag">reload override flag</a> and set its <a href="#reload-override-buffer">reload override
buffer</a> to <var title="">source</var>.</p></li>
</ol><h4 id="documents-in-the-dom"><span class="secno">3.1.1 </span>Documents in the DOM</h4><p>All <code><a href="infrastructure.html#document">Document</a></code> objects (in user agents implementing
this specification) <span class="impl">must</span> also implement
the <code><a href="#htmldocument">HTMLDocument</a></code> interface, available using
binding-specific methods. (This is the case whether or not the
document in question is an <a href="#html-documents" title="HTML documents">HTML
document</a> or indeed whether it contains any <a href="infrastructure.html#html-elements">HTML
elements</a> at all.) <code><a href="infrastructure.html#document">Document</a></code> objects <span class="impl">must</span> also implement the document-level interface
of any other namespaces that the UA supports.</p><p class="example">For example, if an HTML implementation also
supports SVG, then the <code><a href="infrastructure.html#document">Document</a></code> object implements both
<code><a href="#htmldocument">HTMLDocument</a></code> and <code>SVGDocument</code>.</p><p class="note">Because the <code><a href="#htmldocument">HTMLDocument</a></code> interface is
now obtained using binding-specific casting methods instead of
simply being the primary interface of the document object, it is no
longer defined as inheriting from <code><a href="infrastructure.html#document">Document</a></code>.</p><pre class="idl">[OverrideBuiltins]
interface <dfn id="htmldocument">HTMLDocument</dfn> {
// <a href="#resource-metadata-management">resource metadata management</a>
[PutForwards=<a href="history.html#dom-location-href" title="dom-location-href">href</a>] readonly attribute <a href="history.html#location">Location</a> <a href="history.html#dom-document-location" title="dom-document-location">location</a>;
readonly attribute DOMString <a href="#dom-document-url" title="dom-document-URL">URL</a>;
attribute DOMString <a href="origin-0.html#dom-document-domain" title="dom-document-domain">domain</a>;
readonly attribute DOMString <a href="#dom-document-referrer" title="dom-document-referrer">referrer</a>;
attribute DOMString <a href="#dom-document-cookie" title="dom-document-cookie">cookie</a>;
readonly attribute DOMString <a href="#dom-document-lastmodified" title="dom-document-lastModified">lastModified</a>;
readonly attribute DOMString <a href="#dom-document-compatmode" title="dom-document-compatMode">compatMode</a>;
attribute DOMString <a href="#dom-document-charset" title="dom-document-charset">charset</a>;
readonly attribute DOMString <a href="#dom-document-characterset" title="dom-document-characterSet">characterSet</a>;
readonly attribute DOMString <a href="#dom-document-defaultcharset" title="dom-document-defaultCharset">defaultCharset</a>;
readonly attribute DOMString <a href="#dom-document-readystate" title="dom-document-readyState">readyState</a>;
// <a href="#dom-tree-accessors">DOM tree accessors</a>
<a href="#dom-document-nameditem" title="dom-document-namedItem">getter</a> any (in DOMString name);
attribute DOMString <a href="#document.title" title="dom-document-title">title</a>;
attribute DOMString <a href="elements.html#dom-document-dir" title="dom-document-dir">dir</a>;
attribute <a href="elements.html#htmlelement">HTMLElement</a> <a href="#dom-document-body" title="dom-document-body">body</a>;
readonly attribute <a href="semantics.html#htmlheadelement">HTMLHeadElement</a> <a href="#dom-document-head" title="dom-document-head">head</a>;
readonly attribute <a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a> <a href="#dom-document-images" title="dom-document-images">images</a>;
readonly attribute <a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a> <a href="#dom-document-embeds" title="dom-document-embeds">embeds</a>;
readonly attribute <a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a> <a href="#dom-document-plugins" title="dom-document-plugins">plugins</a>;
readonly attribute <a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a> <a href="#dom-document-links" title="dom-document-links">links</a>;
readonly attribute <a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a> <a href="#dom-document-forms" title="dom-document-forms">forms</a>;
readonly attribute <a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a> <a href="#dom-document-scripts" title="dom-document-scripts">scripts</a>;
NodeList <a href="#dom-document-getelementsbyname" title="dom-document-getElementsByName">getElementsByName</a>(in DOMString elementName);
NodeList <a href="#dom-document-getelementsbyclassname" title="dom-document-getElementsByClassName">getElementsByClassName</a>(in DOMString classNames);
// <a href="apis-in-html-documents.html#dynamic-markup-insertion">dynamic markup insertion</a>
attribute DOMString <a href="apis-in-html-documents.html#dom-innerhtml" title="dom-innerHTML">innerHTML</a>;
<a href="#htmldocument">HTMLDocument</a> <a href="apis-in-html-documents.html#dom-document-open" title="dom-document-open">open</a>(in optional DOMString type, in optional DOMString replace);
<a href="browsers.html#windowproxy">WindowProxy</a> <a href="apis-in-html-documents.html#dom-document-open" title="dom-document-open">open</a>(in DOMString url, in DOMString name, in DOMString features, in optional boolean replace);
void <a href="apis-in-html-documents.html#dom-document-close" title="dom-document-close">close</a>();
void <a href="apis-in-html-documents.html#dom-document-write" title="dom-document-write">write</a>(in DOMString... text);
void <a href="apis-in-html-documents.html#dom-document-writeln" title="dom-document-writeln">writeln</a>(in DOMString... text);
// <a href="editing.html#editing">user interaction</a>
readonly attribute <a href="browsers.html#windowproxy">WindowProxy</a> <a href="browsers.html#dom-document-defaultview" title="dom-document-defaultView">defaultView</a>;
readonly attribute <a href="infrastructure.html#element">Element</a> <a href="editing.html#dom-document-activeelement" title="dom-document-activeElement">activeElement</a>;
boolean <a href="editing.html#dom-document-hasfocus" title="dom-document-hasFocus">hasFocus</a>();
attribute DOMString <a href="editing.html#designMode" title="dom-document-designMode">designMode</a>;
boolean <a href="dnd.html#execCommand" title="dom-document-execCommand">execCommand</a>(in DOMString commandId);
boolean <a href="dnd.html#execCommand" title="dom-document-execCommand">execCommand</a>(in DOMString commandId, in boolean showUI);
boolean <a href="dnd.html#execCommand" title="dom-document-execCommand">execCommand</a>(in DOMString commandId, in boolean showUI, in DOMString value);
boolean <a href="dnd.html#dom-document-querycommandenabled" title="dom-document-queryCommandEnabled">queryCommandEnabled</a>(in DOMString commandId);
boolean <a href="dnd.html#dom-document-querycommandindeterm" title="dom-document-queryCommandIndeterm">queryCommandIndeterm</a>(in DOMString commandId);
boolean <a href="dnd.html#dom-document-querycommandstate" title="dom-document-queryCommandState">queryCommandState</a>(in DOMString commandId);
boolean <a href="dnd.html#dom-document-querycommandsupported" title="dom-document-queryCommandSupported">queryCommandSupported</a>(in DOMString commandId);
DOMString <a href="dnd.html#dom-document-querycommandvalue" title="dom-document-queryCommandValue">queryCommandValue</a>(in DOMString commandId);
readonly attribute <a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a> <a href="commands.html#dom-document-commands" title="dom-document-commands">commands</a>;
// <a href="webappapis.html#event-handler-idl-attributes">event handler IDL attributes</a>
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onabort" title="handler-onabort">onabort</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onblur" title="handler-onblur">onblur</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-oncanplay" title="handler-oncanplay">oncanplay</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-oncanplaythrough" title="handler-oncanplaythrough">oncanplaythrough</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onchange" title="handler-onchange">onchange</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onclick" title="handler-onclick">onclick</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-oncontextmenu" title="handler-oncontextmenu">oncontextmenu</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-oncuechange" title="handler-oncuechange">oncuechange</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondblclick" title="handler-ondblclick">ondblclick</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondrag" title="handler-ondrag">ondrag</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondragend" title="handler-ondragend">ondragend</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondragenter" title="handler-ondragenter">ondragenter</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondragleave" title="handler-ondragleave">ondragleave</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondragover" title="handler-ondragover">ondragover</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondragstart" title="handler-ondragstart">ondragstart</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondrop" title="handler-ondrop">ondrop</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondurationchange" title="handler-ondurationchange">ondurationchange</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onemptied" title="handler-onemptied">onemptied</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onended" title="handler-onended">onended</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onerror" title="handler-onerror">onerror</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onfocus" title="handler-onfocus">onfocus</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-oninput" title="handler-oninput">oninput</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-oninvalid" title="handler-oninvalid">oninvalid</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onkeydown" title="handler-onkeydown">onkeydown</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onkeypress" title="handler-onkeypress">onkeypress</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onkeyup" title="handler-onkeyup">onkeyup</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onload" title="handler-onload">onload</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onloadeddata" title="handler-onloadeddata">onloadeddata</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onloadedmetadata" title="handler-onloadedmetadata">onloadedmetadata</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onloadstart" title="handler-onloadstart">onloadstart</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onmousedown" title="handler-onmousedown">onmousedown</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onmousemove" title="handler-onmousemove">onmousemove</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onmouseout" title="handler-onmouseout">onmouseout</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onmouseover" title="handler-onmouseover">onmouseover</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onmouseup" title="handler-onmouseup">onmouseup</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onmousewheel" title="handler-onmousewheel">onmousewheel</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onpause" title="handler-onpause">onpause</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onplay" title="handler-onplay">onplay</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onplaying" title="handler-onplaying">onplaying</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onprogress" title="handler-onprogress">onprogress</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onratechange" title="handler-onratechange">onratechange</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onreadystatechange" title="handler-onreadystatechange">onreadystatechange</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onreset" title="handler-onreset">onreset</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onscroll" title="handler-onscroll">onscroll</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onseeked" title="handler-onseeked">onseeked</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onseeking" title="handler-onseeking">onseeking</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onselect" title="handler-onselect">onselect</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onshow" title="handler-onshow">onshow</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onstalled" title="handler-onstalled">onstalled</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onsubmit" title="handler-onsubmit">onsubmit</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onsuspend" title="handler-onsuspend">onsuspend</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ontimeupdate" title="handler-ontimeupdate">ontimeupdate</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onvolumechange" title="handler-onvolumechange">onvolumechange</a>;
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onwaiting" title="handler-onwaiting">onwaiting</a>;
};
<a href="infrastructure.html#document">Document</a> implements <a href="#htmldocument">HTMLDocument</a>;</pre><p>Since the <code><a href="#htmldocument">HTMLDocument</a></code> interface holds methods and
attributes related to a number of disparate features, the members of
this interface are described in various different sections.</p><h4 id="security-document"><span class="secno">3.1.2 </span>Security</h4><p id="security">User agents <span class="impl">must</span> raise a
<code><a href="common-dom-interfaces.html#security_err">SECURITY_ERR</a></code> exception whenever any of the members of
an <code><a href="#htmldocument">HTMLDocument</a></code> object are accessed by scripts whose
<a href="origin-0.html#effective-script-origin">effective script origin</a> is not the <a href="origin-0.html#same-origin" title="same
origin">same</a> as the <code><a href="infrastructure.html#document">Document</a></code>'s <a href="origin-0.html#effective-script-origin">effective
script origin</a>.</p><h4 id="resource-metadata-management"><span class="secno">3.1.3 </span><dfn>Resource metadata management</dfn></h4><dl class="domintro"><dt><var title="">document</var> . <code title="dom-document-URL"><a href="#dom-document-url">URL</a></code></dt>
<dd>
<p>Returns <a href="#the-document-s-address">the document's address</a>.</p>
</dd>
<dt><var title="">document</var> . <code title="dom-document-referrer"><a href="#dom-document-referrer">referrer</a></code></dt>
<dd>
<p>Returns <a href="#the-document-s-current-address" title="the document's current address">the
address</a> of the <code><a href="infrastructure.html#document">Document</a></code> from which the user
navigated to this one, unless it was blocked or there was no such
document, in which case it returns the empty string.</p>
<p>The <code title="rel-noreferrer"><a href="links.html#link-type-noreferrer">noreferrer</a></code> link
type can be used to block the referrer.</p>
</dd>
</dl><div class="impl">
<p>The <dfn id="dom-document-url" title="dom-document-URL"><code>URL</code></dfn>
attribute must return <a href="#the-document-s-address">the document's address</a>.</p>
<p>The <dfn id="dom-document-referrer" title="dom-document-referrer"><code>referrer</code></dfn> attribute
must return either the <a href="#the-document-s-current-address" title="the document's current
address">current address</a> of the <a href="browsers.html#active-document">active document</a>
of the <a href="history.html#source-browsing-context">source browsing context</a> <em>at the time the
navigation was started</em> (that is, the page which <a href="history.html#navigate" title="navigate">navigated</a> the <a href="browsers.html#browsing-context">browsing context</a>
to the current document), with any <a href="urls.html#url-fragment" title="url-fragment"><fragment></a> component removed; or
the empty string if there is no such originating page, or if the UA
has been configured not to report referrers in this case, or if the
navigation was initiated for a <a href="links.html#hyperlink">hyperlink</a> with a <code title="rel-noreferrer"><a href="links.html#link-type-noreferrer">noreferrer</a></code> keyword.</p>
</div><p class="note">In the case of HTTP, the <code title="dom-document-referrer"><a href="#dom-document-referrer">referrer</a></code> IDL attribute will
match the <code title="http-referer">Referer</code> (sic) header
that was sent when <a href="fetching-resources.html#fetch" title="fetch">fetching</a> the current
page.</p><p class="note">Typically user agents are configured to not report
referrers in the case where the referrer uses an encrypted protocol
and the current page does not (e.g. when navigating from an <code title="">https:</code> page to an <code title="">http:</code>
page).</p><hr><dl class="domintro"><dt><var title="">document</var> . <code title="dom-document-cookie"><a href="#dom-document-cookie">cookie</a></code> [ = <var title="">value</var> ]</dt>
<dd>
<p>Returns the HTTP cookies that apply to the
<code><a href="infrastructure.html#document">Document</a></code>. If there are no cookies or cookies can't be
applied to this resource, the empty string will be returned.</p>
<p>Can be set, to add a new cookie to the element's set of HTTP
cookies.</p>
<p>If the contents are <a href="the-iframe-element.html#sandboxed-origin-browsing-context-flag" title="sandboxed origin browsing
context flag">sandboxed into a unique origin</a> (in an
<code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code> with the <code title="attr-iframe-sandbox"><a href="the-iframe-element.html#attr-iframe-sandbox">sandbox</a></code> attribute) or the
resource was labeled as <code><a href="iana.html#text-html-sandboxed">text/html-sandboxed</a></code>, a
<code><a href="common-dom-interfaces.html#security_err">SECURITY_ERR</a></code> exception will be thrown on getting and
setting.</p>
</dd>
</dl><div class="impl">
<p>The <dfn id="dom-document-cookie" title="dom-document-cookie"><code>cookie</code></dfn>
attribute represents the cookies of the resource from which the
<code><a href="infrastructure.html#document">Document</a></code> was created.</p>
<p>A <code><a href="infrastructure.html#document">Document</a></code> object that falls into one of the
following conditions is a <dfn id="cookie-free-document-object">cookie-free <code>Document</code>
object</dfn>:</p>
<ul><li>A <code><a href="infrastructure.html#document">Document</a></code> that has no <a href="browsers.html#browsing-context">browsing
context</a>.</li>
<li>A <code><a href="infrastructure.html#document">Document</a></code> whose <a href="#the-document-s-address" title="the document's
address">address</a> does not use a server-based naming
authority.</li>
</ul><p id="sandboxCookies">On getting, if the document is a
<a href="#cookie-free-document-object">cookie-free <code>Document</code> object</a>, then the user
agent must return the empty string. Otherwise, if the
<code><a href="infrastructure.html#document">Document</a></code>'s <a href="origin-0.html#origin">origin</a> is not a
scheme/host/port tuple, the user agent must raise a
<code><a href="common-dom-interfaces.html#security_err">SECURITY_ERR</a></code> exception. Otherwise, the user agent must
first <a href="webappapis.html#obtain-the-storage-mutex">obtain the storage mutex</a> and then return the
cookie-string for <a href="#the-document-s-address">the document's address</a> for a
"non-HTTP" API, <a href="infrastructure.html#decoded-as-utf-8-with-error-handling">decoded as UTF-8, with error handling</a>.
<a href="references.html#refsCOOKIES">[COOKIES]</a></p>
<p>On setting, if the document is a <a href="#cookie-free-document-object">cookie-free
<code>Document</code> object</a>, then the user agent must do
nothing. Otherwise, if the <code><a href="infrastructure.html#document">Document</a></code>'s
<a href="origin-0.html#origin">origin</a> is not a scheme/host/port tuple, the user agent
must raise a <code><a href="common-dom-interfaces.html#security_err">SECURITY_ERR</a></code> exception. Otherwise, the
user agent must <a href="webappapis.html#obtain-the-storage-mutex">obtain the storage mutex</a> and then act
as it would when <span title="receives a
set-cookie-string">receiving a set-cookie-string</span> for
<a href="#the-document-s-address">the document's address</a> via a "non-HTTP" API, consisting
of the new value encoded as UTF-8. <a href="references.html#refsCOOKIES">[COOKIES]</a> <a href="references.html#refsRFC3629">[RFC3629]</a></p>
<p class="note">Since the <code title="dom-document-cookie"><a href="#dom-document-cookie">cookie</a></code> attribute is accessible
across frames, the path restrictions on cookies are only a tool to
help manage which cookies are sent to which parts of the site, and
are not in any way a security feature.</p>
<hr></div><dl class="domintro"><dt><var title="">document</var> . <code title="dom-document-lastmodified"><a href="#dom-document-lastmodified">lastModified</a></code></dt>
<dd>
<p>Returns the date of the last modification to the document, as
reported by the server, in the form "<code title="">MM/DD/YYYY hh:mm:ss</code>", in the user's local
time zone.</p>
<p>If the last modification date is not known, the current time is
returned instead.</p>
</dd>
</dl><div class="impl">
<p>The <dfn id="dom-document-lastmodified" title="dom-document-lastModified"><code>lastModified</code></dfn>
attribute, on getting, must return the date and time of the
<code><a href="infrastructure.html#document">Document</a></code>'s source file's last modification, in the
user's local time zone, in the following format:</p>
<ol><li> The month component of the date. </li>
<li> A U+002F SOLIDUS character (/). </li>
<li> The day component of the date. </li>
<li> A U+002F SOLIDUS character (/). </li>
<li> The year component of the date. </li>
<li> A U+0020 SPACE character. </li>
<li> The hours component of the time. </li>
<li> A U+003A COLON character (:). </li>
<li> The minutes component of the time. </li>
<li> A U+003A COLON character (:). </li>
<li> The seconds component of the time. </li>
</ol><p>All the numeric components above, other than the year, must be
given as two digits in the range U+0030 DIGIT ZERO (0) to U+0039
DIGIT NINE (9) representing the number in base ten, zero-padded if
necessary. The year must be given as the shortest possible string of
four or more digits in the range U+0030 DIGIT ZERO (0) to U+0039
DIGIT NINE (9) representing the number in base ten, zero-padded if
necessary.</p>
<p>The <code><a href="infrastructure.html#document">Document</a></code>'s source file's last modification date
and time must be derived from relevant features of the networking
protocols used, e.g. from the value of the HTTP <code title="http-last-modified">Last-Modified</code> header of the
document, or from metadata in the file system for local files. If
the last modification date and time are not known, the attribute
must return the current date and time in the above format.</p>
<hr></div><dl class="domintro"><dt><var title="">document</var> . <code title="dom-document-compatmode"><a href="#dom-document-compatmode">compatMode</a></code></dt>
<dd>
<p>In a conforming document, returns the string "<code title="">CSS1Compat</code>". (In <a href="#quirks-mode">quirks mode</a>
documents, returns the string "<code title="">BackCompat</code>",
but a conforming document can never trigger <a href="#quirks-mode">quirks
mode</a>.)</p>
</dd>
</dl><div class="impl">
<p>A <code><a href="infrastructure.html#document">Document</a></code> is always set to one of three modes:
<dfn id="no-quirks-mode">no-quirks mode</dfn>, the default; <dfn id="quirks-mode">quirks mode</dfn>, used
typically for legacy documents; and <dfn id="limited-quirks-mode">limited-quirks mode</dfn>,
also known as "almost standards" mode. The mode is only ever changed
from the default by the <a href="parsing.html#html-parser">HTML parser</a>, based on the
presence, absence, or value of the DOCTYPE string.</p>
<p>The <dfn id="dom-document-compatmode" title="dom-document-compatMode"><code>compatMode</code></dfn> IDL
attribute must return the literal string "<code title="">CSS1Compat</code>" unless the document has been set to
<a href="#quirks-mode">quirks mode</a> by the <a href="parsing.html#html-parser">HTML parser</a>, in which
case it must instead return the literal string "<code title="">BackCompat</code>".</p>
<hr></div><dl class="domintro"><dt><var title="">document</var> . <code title="dom-document-charset"><a href="#dom-document-charset">charset</a></code> [ = <var title="">value</var> ]</dt>
<dd>
<p>Returns the <a href="#document-s-character-encoding">document's character encoding</a>.</p>
<p>Can be set, to dynamically change the <a href="#document-s-character-encoding">document's
character encoding</a>.</p>
<p>New values that are not IANA-registered aliases supported by the user agent are ignored.</p>
</dd>
<dt><var title="">document</var> . <code title="dom-document-characterSet"><a href="#dom-document-characterset">characterSet</a></code></dt>
<dd>
<p>Returns the <a href="#document-s-character-encoding">document's character encoding</a>.</p>
</dd>
<dt><var title="">document</var> . <code title="dom-document-defaultCharset"><a href="#dom-document-defaultcharset">defaultCharset</a></code></dt>
<dd>
<p>Returns what might be the user agent's default character
encoding. (The user agent might return another character encoding
altogether, e.g. to protect the user's privacy, or if the user
agent doesn't use a single default encoding.)</p>
</dd>
</dl><div class="impl">
<p>Documents have an associated <dfn id="document-s-character-encoding" title="document's character
encoding">character encoding</dfn>. When a <code><a href="infrastructure.html#document">Document</a></code>
object is created, the <a href="#document-s-character-encoding">document's character encoding</a>
must be initialized to UTF-16. Various algorithms during page
loading affect this value, as does the <code title="dom-document-charset"><a href="#dom-document-charset">charset</a></code> setter. <a href="references.html#refsIANACHARSET">[IANACHARSET]</a></p>
<p>The <dfn id="dom-document-charset" title="dom-document-charset"><code>charset</code></dfn>
IDL attribute must, on getting, return the <a href="infrastructure.html#preferred-mime-name">preferred MIME
name</a> of the <a href="#document-s-character-encoding">document's character encoding</a>. On
setting, if the new value is an IANA-registered alias for a
character encoding supported by the user agent, the <a href="#document-s-character-encoding">document's
character encoding</a> must be set to that character
encoding. (Otherwise, nothing happens.)</p>
<p>The <dfn id="dom-document-characterset" title="dom-document-characterSet"><code>characterSet</code></dfn>
IDL attribute must, on getting, return the <a href="infrastructure.html#preferred-mime-name">preferred MIME
name</a> of the <a href="#document-s-character-encoding">document's character encoding</a>.</p>
<p>The <dfn id="dom-document-defaultcharset" title="dom-document-defaultCharset"><code>defaultCharset</code></dfn>
IDL attribute must, on getting, return the <a href="infrastructure.html#preferred-mime-name">preferred MIME
name</a> of a character encoding, possibly the user's default
encoding, or an encoding associated with the user's current
geographical location, or any arbitrary encoding name.</p>
<hr></div><dl class="domintro"><dt><var title="">document</var> . <code title="dom-document-readyState"><a href="#dom-document-readystate">readyState</a></code></dt>
<dd>
<p>Returns "loading" while the <code><a href="infrastructure.html#document">Document</a></code> is loading, "interactive" once it is finished parsing but still loading sub-resources, and "complete" once it has loaded.</p>
<p>The <code title="event-readystatechange"><a href="#event-readystatechange">readystatechange</a></code> event fires on the <code><a href="infrastructure.html#document">Document</a></code> object when this value changes.</p>
</dd>
</dl><div class="impl">
<p>Each document has a <dfn id="current-document-readiness">current document readiness</dfn>. When a
<code><a href="infrastructure.html#document">Document</a></code> object is created, it must have its
<a href="#current-document-readiness">current document readiness</a> set to the string "loading"
if the document is associated with an <a href="parsing.html#html-parser">HTML parser</a> or an
<a href="the-xhtml-syntax.html#xml-parser">XML parser</a>, or to the string "complete" otherwise.
Various algorithms during page loading affect this value. When the
value is set, the user agent must <a href="webappapis.html#fire-a-simple-event">fire a simple event</a>
named <dfn id="event-readystatechange" title="event-readystatechange"><code>readystatechange</code></dfn>
at the <code><a href="infrastructure.html#document">Document</a></code> object.</p>
<p>A <code><a href="infrastructure.html#document">Document</a></code> is said to have an <dfn id="active-parser">active
parser</dfn> if it is associated with an <a href="parsing.html#html-parser">HTML parser</a> or
an <a href="the-xhtml-syntax.html#xml-parser">XML parser</a> that has not yet been <a href="the-end.html#stop-parsing" title="stop
parsing">stopped</a> or <a href="the-end.html#abort-a-parser" title="abort a
parser">aborted</a>.</p>
<p>The <dfn id="dom-document-readystate" title="dom-document-readyState"><code>readyState</code></dfn> IDL
attribute must, on getting, return the <a href="#current-document-readiness">current document
readiness</a>.</p>
</div><h4 id="dom-tree-accessors"><span class="secno">3.1.4 </span><dfn>DOM tree accessors</dfn></h4><p><dfn id="the-html-element-0">The <code>html</code> element</dfn> of a document is the
document's root element, if there is one and it's an
<code><a href="semantics.html#the-html-element">html</a></code> element, or null otherwise.</p><hr><dl class="domintro"><dt><var title="">document</var> . <code title="dom-document-head"><a href="#dom-document-head">head</a></code></dt>
<dd>
<p>Returns <a href="#the-head-element-0">the <code>head</code> element</a>.</p>
</dd>
</dl><p><dfn id="the-head-element-0">The <code>head</code> element</dfn> of a document is the
first <code><a href="semantics.html#the-head-element">head</a></code> element that is a child of <a href="#the-html-element-0">the
<code>html</code> element</a>, if there is one, or null
otherwise.</p><div class="impl">
<p>The <dfn id="dom-document-head" title="dom-document-head"><code>head</code></dfn>
attribute, on getting, must return <a href="#the-head-element-0">the <code>head</code>
element</a> of the document (a <code><a href="semantics.html#the-head-element">head</a></code> element or
null).</p>
</div><hr><dl class="domintro"><dt><var title="">document</var> . <code title="dom-document-title"><a href="#document.title">title</a></code> [ = <var title="">value</var> ]</dt>
<dd>
<p>Returns the document's title, as given by <a href="#the-title-element-0">the
<code>title</code> element</a>.</p>
<p>Can be set, to update the document's title. If there is no
<a href="#the-head-element-0" title="the head element"><code>head</code> element</a>,
the new value is ignored.</p>
<p>In SVG documents, the <code>SVGDocument</code> interface's
<code title="dom-svg-title">title</code> attribute takes
precedence.</p>
</dd>
</dl><p><dfn id="the-title-element-0">The <code>title</code> element</dfn> of a document is the
first <code><a href="semantics.html#the-title-element">title</a></code> element in the document (in tree order), if
there is one, or null otherwise.</p><div class="impl">
<p>The <dfn id="document.title" title="dom-document-title"><code>title</code></dfn> attribute must,
on getting, run the following algorithm:</p>
<ol><li><p>If the <a href="infrastructure.html#root-element">root element</a> is an <code><a href="the-map-element.html#svg">svg</a></code>
element in the "<code title="">http://www.w3.org/2000/svg</code>"
namespace, and the user agent supports SVG, then return the value
that would have been returned by the IDL attribute of the same name
on the <code>SVGDocument</code> interface. <a href="references.html#refsSVG">[SVG]</a></p></li>
<li><p>Otherwise, let <var title="">value</var> be a concatenation
of the data of all the child <a href="infrastructure.html#text-node" title="text node">text
nodes</a> of <a href="#the-title-element-0">the <code>title</code> element</a>, in
<a href="infrastructure.html#tree-order">tree order</a>, or the empty string if <a href="#the-title-element-0">the
<code>title</code> element</a> is null.</p></li>
<li><p>Replace any sequence of one or more consecutive <a href="common-microsyntaxes.html#space-character" title="space character">space characters</a> in <var title="">value</var> with a single U+0020 SPACE character.</p></li>
<li><p>Remove any leading or trailing <a href="common-microsyntaxes.html#space-character" title="space
character">space characters</a> in <var title="">value</var>.</p></li>
<li><p>Return <var title="">value</var>.</p></li>
</ol><p>On setting, the following algorithm must be run. Mutation events
must be fired as appropriate.</p>
<ol><li><p>If the <a href="infrastructure.html#root-element">root element</a> is an <code><a href="the-map-element.html#svg">svg</a></code>
element in the "<code title="">http://www.w3.org/2000/svg</code>"
namespace, and the user agent supports SVG, then the setter must
defer to the setter for the IDL attribute of the same name on the
<code>SVGDocument</code> interface (if it is readonly, then this
will raise an exception). Stop the algorithm here. <a href="references.html#refsSVG">[SVG]</a></p></li>
<li>If <a href="#the-title-element-0">the <code>title</code> element</a> is null and
<a href="#the-head-element-0">the <code>head</code> element</a> is null, then the
attribute must do nothing. Stop the algorithm here.</li>
<li>If <a href="#the-title-element-0">the <code>title</code> element</a> is null, then a
new <code><a href="semantics.html#the-title-element">title</a></code> element must be created and appended to
<a href="#the-head-element-0">the <code>head</code> element</a>. Let <var title="">element</var> be that element. Otherwise, let <var title="">element</var> be <a href="#the-title-element-0">the <code>title</code>
element</a>.</li>
<li>The children of <var title="">element</var> (if any) must all
be removed.</li>
<li>A single <code><a href="infrastructure.html#text">Text</a></code> node whose data is the new value
being assigned must be appended to <var title="">element</var>.</li>
</ol><p>The <code title="dom-document-title"><a href="#document.title">title</a></code> attribute on
the <code><a href="#htmldocument">HTMLDocument</a></code> interface should shadow the attribute
of the same name on the <code>SVGDocument</code> interface when the
user agent supports both HTML and SVG. <a href="references.html#refsSVG">[SVG]</a></p>
</div><hr><dl class="domintro"><dt><var title="">document</var> . <code title="dom-document-body"><a href="#dom-document-body">body</a></code> [ = <var title="">value</var> ]</dt>
<dd>
<p>Returns <a href="#the-body-element-0">the body element</a>.</p>
<p>Can be set, to replace <a href="#the-body-element-0">the body element</a>.</p>
<p>If the new value is not a <code><a href="sections.html#the-body-element">body</a></code> or <code><a href="obsolete.html#frameset">frameset</a></code> element, this will throw a <code><a href="common-dom-interfaces.html#hierarchy_request_err">HIERARCHY_REQUEST_ERR</a></code> exception.</p>
</dd>
</dl><p><dfn id="the-body-element-0">The body element</dfn> of a document is the first child of
<a href="#the-html-element-0">the <code>html</code> element</a> that is either a
<code><a href="sections.html#the-body-element">body</a></code> element or a <code><a href="obsolete.html#frameset">frameset</a></code> element. If
there is no such element, it is null. <span class="impl">If the body
element is null, then when the specification requires that events be
fired at "the body element", they must instead be fired at the
<code><a href="infrastructure.html#document">Document</a></code> object.</span></p><div class="impl">
<p>The <dfn id="dom-document-body" title="dom-document-body"><code>body</code></dfn>
attribute, on getting, must return <a href="#the-body-element-0">the body element</a> of
the document (either a <code><a href="sections.html#the-body-element">body</a></code> element, a
<code><a href="obsolete.html#frameset">frameset</a></code> element, or null). On setting, the following
algorithm must be run:</p>
<ol><li>If the new value is not a <code><a href="sections.html#the-body-element">body</a></code> or
<code><a href="obsolete.html#frameset">frameset</a></code> element, then raise a
<code><a href="common-dom-interfaces.html#hierarchy_request_err">HIERARCHY_REQUEST_ERR</a></code> exception and abort these
steps.</li>
<li>Otherwise, if the new value is the same as <a href="#the-body-element-0">the body
element</a>, do nothing. Abort these steps.</li>
<li>Otherwise, if <a href="#the-body-element-0">the body element</a> is not null, then
replace that element with the new value in the DOM, as if the root
element's <code title="">replaceChild()</code> method had been
called with the new value and <a href="#the-body-element-0" title="the body element">the
incumbent body element</a> as its two arguments respectively,
then abort these steps.</li>
<li>Otherwise, <a href="#the-body-element-0">the body element</a> is null. Append
the new value to the root element.</li>
</ol></div><hr><dl class="domintro"><dt><var title="">document</var> . <code title="dom-document-images"><a href="#dom-document-images">images</a></code></dt>
<dd>
<p>Returns an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> of the <code><a href="embedded-content-1.html#the-img-element">img</a></code> elements in the <code><a href="infrastructure.html#document">Document</a></code>.</p>
</dd>
<dt><var title="">document</var> . <code title="dom-document-embeds"><a href="#dom-document-embeds">embeds</a></code></dt>
<dt><var title="">document</var> . <code title="dom-document-plugins"><a href="#dom-document-plugins">plugins</a></code></dt>
<dd>
<p>Return an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> of the <code><a href="the-iframe-element.html#the-embed-element">embed</a></code> elements in the <code><a href="infrastructure.html#document">Document</a></code>.</p>
</dd>
<dt><var title="">document</var> . <code title="dom-document-links"><a href="#dom-document-links">links</a></code></dt>
<dd>
<p>Returns an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> of the <code><a href="text-level-semantics.html#the-a-element">a</a></code> and <code><a href="the-map-element.html#the-area-element">area</a></code> elements in the <code><a href="infrastructure.html#document">Document</a></code> that have <code title="attr-hyperlink-href"><a href="links.html#attr-hyperlink-href">href</a></code> attributes.</p>
</dd>
<dt><var title="">document</var> . <code title="dom-document-forms"><a href="#dom-document-forms">forms</a></code></dt>
<dd>
<p>Return an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> of the <code><a href="forms.html#the-form-element">form</a></code> elements in the <code><a href="infrastructure.html#document">Document</a></code>.</p>
</dd>
<dt><var title="">document</var> . <code title="dom-document-scripts"><a href="#dom-document-scripts">scripts</a></code></dt>
<dd>
<p>Return an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> of the <code><a href="scripting-1.html#the-script-element">script</a></code> elements in the <code><a href="infrastructure.html#document">Document</a></code>.</p>
</dd>
</dl><div class="impl">
<p>The <dfn id="dom-document-images" title="dom-document-images"><code>images</code></dfn>
attribute must return an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> rooted at the
<code><a href="infrastructure.html#document">Document</a></code> node, whose filter matches only
<code><a href="embedded-content-1.html#the-img-element">img</a></code> elements.</p>
<p>The <dfn id="dom-document-embeds" title="dom-document-embeds"><code>embeds</code></dfn>
attribute must return an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> rooted at the
<code><a href="infrastructure.html#document">Document</a></code> node, whose filter matches only
<code><a href="the-iframe-element.html#the-embed-element">embed</a></code> elements.</p>
<p>The <dfn id="dom-document-plugins" title="dom-document-plugins"><code>plugins</code></dfn>
attribute must return the same object as that returned by the <code title="dom-document-embeds"><a href="#dom-document-embeds">embeds</a></code> attribute.</p>
<p>The <dfn id="dom-document-links" title="dom-document-links"><code>links</code></dfn>
attribute must return an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> rooted at the
<code><a href="infrastructure.html#document">Document</a></code> node, whose filter matches only <code><a href="text-level-semantics.html#the-a-element">a</a></code>
elements with <code title="attr-hyperlink-href"><a href="links.html#attr-hyperlink-href">href</a></code>
attributes and <code><a href="the-map-element.html#the-area-element">area</a></code> elements with <code title="attr-hyperlink-href"><a href="links.html#attr-hyperlink-href">href</a></code> attributes.</p>
<p>The <dfn id="dom-document-forms" title="dom-document-forms"><code>forms</code></dfn>
attribute must return an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> rooted at the
<code><a href="infrastructure.html#document">Document</a></code> node, whose filter matches only
<code><a href="forms.html#the-form-element">form</a></code> elements.</p>
<p>The <dfn id="dom-document-scripts" title="dom-document-scripts"><code>scripts</code></dfn>
attribute must return an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> rooted at the
<code><a href="infrastructure.html#document">Document</a></code> node, whose filter matches only
<code><a href="scripting-1.html#the-script-element">script</a></code> elements.</p>
<hr></div><dl class="domintro"><dt><var title="">collection</var> = <var title="">document</var> . <code title="dom-document-getElementsByName"><a href="#dom-document-getelementsbyname">getElementsByName</a></code>(<var title="">name</var>)</dt>
<dd>
<p>Returns a <code><a href="infrastructure.html#nodelist">NodeList</a></code> of elements in the
<code><a href="infrastructure.html#document">Document</a></code> that have a <code title="">name</code>
attribute with the value <var title="">name</var>.</p>
</dd>
<dt><var title="">collection</var> = <var title="">document</var> . <code title="dom-document-getElementsByClassName"><a href="#dom-document-getelementsbyclassname">getElementsByClassName(<var title="">classes</var>)</a></code></dt>
<dt><var title="">collection</var> = <var title="">element</var> . <code title="dom-getElementsByClassName"><a href="#dom-getelementsbyclassname">getElementsByClassName(<var title="">classes</var>)</a></code></dt>
<dd>
<p>Returns a <code><a href="infrastructure.html#nodelist">NodeList</a></code> of the elements in the object
on which the method was invoked (a <code><a href="infrastructure.html#document">Document</a></code> or an
<code><a href="infrastructure.html#element">Element</a></code>) that have all the classes given by <var title="">classes</var>.</p>
<p>The <var title="">classes</var> argument is interpreted as a
space-separated list of classes.</p>
</dd>
</dl><div class="impl">
<p>The <dfn id="dom-document-getelementsbyname" title="dom-document-getElementsByName"><code>getElementsByName(<var title="">name</var>)</code></dfn> method takes a string <var title="">name</var>, and must return a <a href="infrastructure.html#live">live</a>
<code><a href="infrastructure.html#nodelist">NodeList</a></code> containing all the <a href="infrastructure.html#html-elements">HTML elements</a>
in that document that have a <code title="">name</code> attribute
whose value is equal to the <var title="">name</var> argument (in a
<a href="infrastructure.html#case-sensitive">case-sensitive</a> manner), in <a href="infrastructure.html#tree-order">tree order</a>.
When the method is invoked on a <code><a href="infrastructure.html#document">Document</a></code> object again
with the same argument, the user agent may return the same as the
object returned by the earlier call. In other cases, a new
<code><a href="infrastructure.html#nodelist">NodeList</a></code> object must be returned.</p>
<p>The <dfn id="dom-document-getelementsbyclassname" title="dom-document-getElementsByClassName"><code>getElementsByClassName(<var title="">classNames</var>)</code></dfn> method takes a string that
contains a <a href="common-microsyntaxes.html#set-of-space-separated-tokens">set of space-separated tokens</a> representing
classes. When called, the method must return a <a href="infrastructure.html#live">live</a>
<code><a href="infrastructure.html#nodelist">NodeList</a></code> object containing all the elements in the
document, in <a href="infrastructure.html#tree-order">tree order</a>, that have all the classes
specified in that argument, having obtained the classes by <a href="common-microsyntaxes.html#split-a-string-on-spaces" title="split a string on spaces">splitting a string on
spaces</a>. (Duplicates are ignored.) If there are no tokens
specified in the argument, then the method must return an empty
<code><a href="infrastructure.html#nodelist">NodeList</a></code>. If the document is in <a href="#quirks-mode">quirks
mode</a>, then the comparisons for the classes must be done in an
<a href="infrastructure.html#ascii-case-insensitive">ASCII case-insensitive</a> manner, otherwise, the
comparisons must be done in a <a href="infrastructure.html#case-sensitive">case-sensitive</a> manner.
When the method is invoked on a <code><a href="infrastructure.html#document">Document</a></code> object again
with the same argument, the user agent may return the same object as
the object returned by the earlier call. In other cases, a new
<code><a href="infrastructure.html#nodelist">NodeList</a></code> object must be returned.</p>
<p>The <dfn id="dom-getelementsbyclassname" title="dom-getElementsByClassName"><code>getElementsByClassName(<var title="">classNames</var>)</code></dfn> method on the
<code><a href="elements.html#htmlelement">HTMLElement</a></code> interface must return a <a href="infrastructure.html#live">live</a>
<code><a href="infrastructure.html#nodelist">NodeList</a></code> with the nodes that the
<code><a href="#htmldocument">HTMLDocument</a></code> <code title="dom-document-getElementsByClassName"><a href="#dom-document-getelementsbyclassname">getElementsByClassName()</a></code>
method would return when passed the same argument(s), excluding any
elements that are not descendants of the <code><a href="elements.html#htmlelement">HTMLElement</a></code>
object on which the method was invoked.
When the method is invoked on an <code><a href="elements.html#htmlelement">HTMLElement</a></code> object
again with the same argument, the user agent may return the same
object as the object returned by the earlier call. In other cases, a
new <code><a href="infrastructure.html#nodelist">NodeList</a></code> object must be returned.</p>
</div><p>HTML, SVG, and MathML elements define which classes they are in
by having an attribute with no namespace with the name <code title="">class</code> containing a space-separated list of classes
to which the element belongs. Other specifications may also allow
elements in their namespaces to be labeled as being in specific
classes.</p><div class="example">
<p>Given the following XHTML fragment:</p>
<pre><div id="example">
<p id="p1" class="aaa bbb"/>
<p id="p2" class="aaa ccc"/>
<p id="p3" class="bbb ccc"/>
</div></pre>
<p>A call to <code title="">document.getElementById('example').getElementsByClassName('aaa')</code>
would return a <code><a href="infrastructure.html#nodelist">NodeList</a></code> with the two paragraphs <code title="">p1</code> and <code title="">p2</code> in it.</p>
<p>A call to <code title="">getElementsByClassName('ccc bbb')</code> would only
return one node, however, namely <code title="">p3</code>. A call
to <code title="">document.getElementById('example').getElementsByClassName('bbb  ccc ')</code>
would return the same thing.</p>
<p>A call to <code title="">getElementsByClassName('aaa,bbb')</code> would return no
nodes; none of the elements above are in the "aaa,bbb" class.</p>
</div><div class="impl">
<hr><p>The <code><a href="#htmldocument">HTMLDocument</a></code> interface <span title="support
named properties">supports named properties</span>. The
<a href="infrastructure.html#supported-property-names">supported property names</a> at any moment consist of the
values of the <code title="attr-name">name</code> content attributes
of all the
<code><a href="obsolete.html#the-applet-element">applet</a></code>,
<a href="#exposed">exposed</a> <code><a href="the-iframe-element.html#the-embed-element">embed</a></code>,
<code><a href="forms.html#the-form-element">form</a></code>,
<code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code>,
<code><a href="embedded-content-1.html#the-img-element">img</a></code>, and
<a href="#exposed">exposed</a> <code><a href="the-iframe-element.html#the-object-element">object</a></code>
elements in the <code><a href="infrastructure.html#document">Document</a></code> that have <code title="attr-name">name</code> content attributes, and the values of
the <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> content attributes of all the
<code><a href="obsolete.html#the-applet-element">applet</a></code> and
<a href="#exposed">exposed</a> <code><a href="the-iframe-element.html#the-object-element">object</a></code>
elements in the <code><a href="infrastructure.html#document">Document</a></code> that have <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> content attributes, and the values of the
<code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> content attributes of all the
<code><a href="embedded-content-1.html#the-img-element">img</a></code>
elements in the <code><a href="infrastructure.html#document">Document</a></code> that have both <code title="attr-name">name</code> content attributes and <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> content attributes.</p>
<p>When <dfn id="dom-document-nameditem" title="dom-document-namedItem">the
<code>HTMLDocument</code> object is indexed for property
retrieval</dfn> using a name <var title="">name</var>, then the user
agent must return the value obtained using the following steps:</p>
<ol><li>
<p>Let <var title="">elements</var> be the list of <a href="#dom-document-nameditem-filter" title="dom-document-namedItem-filter">named elements</a> with
the name <var title="">name</var> in the <code><a href="infrastructure.html#document">Document</a></code>.
</p><p class="note">There will be at least one such element, by
definition.</p>
</li>
<li>
<p>If <var title="">elements</var> has only one element, and that
element is an <code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code> element, then return the
<code><a href="browsers.html#windowproxy">WindowProxy</a></code> object of the <a href="browsers.html#nested-browsing-context">nested browsing
context</a> represented by that <code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code> element,
and abort these steps.</p>
</li>
<li>
<p>Otherwise, if <var title="">elements</var> has only one
element, return that element and abort these steps.</p>
</li>
<li>
<p>Otherwise return an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> rooted at the
<code><a href="infrastructure.html#document">Document</a></code> node, whose filter matches only <a href="#dom-document-nameditem-filter" title="dom-document-namedItem-filter">named elements</a> with
the name <var title="">name</var>.</p>
</li>
</ol><p><dfn id="dom-document-nameditem-filter" title="dom-document-nameditem-filter">Named elements</dfn>
with the name <var title="">name</var>, for the purposes of the
above algorithm, are those that are either:</p>
<ul><li><code><a href="obsolete.html#the-applet-element">applet</a></code>, <a href="#exposed">exposed</a> <code><a href="the-iframe-element.html#the-embed-element">embed</a></code>,
<code><a href="forms.html#the-form-element">form</a></code>, <code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code>, <code><a href="embedded-content-1.html#the-img-element">img</a></code>, or
<a href="#exposed">exposed</a> <code><a href="the-iframe-element.html#the-object-element">object</a></code> elements that have a <code title="attr-name">name</code> content attribute whose value is <var title="">name</var>, or</li>
<li><code><a href="obsolete.html#the-applet-element">applet</a></code> or <a href="#exposed">exposed</a> <code><a href="the-iframe-element.html#the-object-element">object</a></code>
elements that have an <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> content
attribute whose value is <var title="">name</var>, or</li>
<li><code><a href="embedded-content-1.html#the-img-element">img</a></code> elements that have an <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> content attribute whose value is <var title="">name</var>, and that have a <code title="attr-name">name</code> content attribute present also.</li>
</ul><p>An <code><a href="the-iframe-element.html#the-embed-element">embed</a></code> or <code><a href="the-iframe-element.html#the-object-element">object</a></code> element is said to
be <dfn id="exposed">exposed</dfn> if it has no <a href="#exposed">exposed</a>
<code><a href="the-iframe-element.html#the-object-element">object</a></code> ancestor, and, for <code><a href="the-iframe-element.html#the-object-element">object</a></code> elements,
is additionally either not showing its <a href="content-models.html#fallback-content">fallback content</a>
or has no <code><a href="the-iframe-element.html#the-object-element">object</a></code> or <code><a href="the-iframe-element.html#the-embed-element">embed</a></code> descendants.</p>
</div><hr><p class="note">The <code title="dom-document-dir"><a href="elements.html#dom-document-dir">dir</a></code>
attribute on the <code><a href="#htmldocument">HTMLDocument</a></code> interface is defined
along with the <code title="attr-dir"><a href="elements.html#the-dir-attribute">dir</a></code> content
attribute.</p><h4 id="creating-documents"><span class="secno">3.1.5 </span>Creating documents</h4><p><a href="#xml-documents">XML documents</a> can be created from script using the
<code title="dom-DOMImplementation-createDocument"><a href="infrastructure.html#dom-domimplementation-createdocument">createDocument()</a></code>
method on the <code><a href="infrastructure.html#domimplementation">DOMImplementation</a></code> interface.</p><p><a href="#html-documents">HTML documents</a> can be created using the <code title="dom-DOMHTMLImplementation-createHTMLDocument"><a href="#dom-domhtmlimplementation-createhtmldocument">createHTMLDocument()</a></code>
method:</p><pre class="idl">[Supplemental, NoInterfaceObject]
interface <dfn id="domhtmlimplementation">DOMHTMLImplementation</dfn> {
<a href="infrastructure.html#document">Document</a> <a href="#dom-domhtmlimplementation-createhtmldocument" title="dom-DOMHTMLImplementation-createHTMLDocument">createHTMLDocument</a>(in DOMString title);
};
<a href="infrastructure.html#domimplementation">DOMImplementation</a> implements <a href="#domhtmlimplementation">DOMHTMLImplementation</a>;</pre><dl class="domintro"><dt><var title="">document</var> = <var title="">document</var> . <code title="dom-document-implementation">implementation</code> . <code title="dom-DOMHTMLImplementation-createHTMLDocument"><a href="#dom-domhtmlimplementation-createhtmldocument">createHTMLDocument</a></code>( <var title="">title</var> )</dt>
<dd>
<p>Returns a new <code><a href="infrastructure.html#document">Document</a></code>, with a basic DOM already
constructed with an appropriate <code><a href="semantics.html#the-title-element">title</a></code> element.</p>
</dd>
</dl><div class="impl">
<p>The <dfn id="dom-domhtmlimplementation-createhtmldocument" title="dom-DOMHTMLImplementation-createHTMLDocument"><code>createHTMLDocument(<var title="">title</var>)</code></dfn> method, when invoked, must run the
following steps:</p>
<ol><li><p>Let <var title="">doc</var> be a newly created
<code><a href="infrastructure.html#document">Document</a></code> object.</p></li>
<li><p>Mark <var title="">doc</var> as being an <a href="#html-documents" title="HTML
documents">HTML document</a>.</p></li>
<li><p>Create a <code><a href="infrastructure.html#documenttype">DocumentType</a></code> node with the <code title="">name</code> attribute set to the string "<code title="">html</code>", and the other attributes specific to
<code><a href="infrastructure.html#documenttype">DocumentType</a></code> objects set to the empty string, null,
and empty lists, as appropriate. Append the newly created node to
<var title="">doc</var>.</p></li>
<li><p>Create an <code><a href="semantics.html#the-html-element">html</a></code> element, and append it to <var title="">doc</var>.</p></li>
<li><p>Create a <code><a href="semantics.html#the-head-element">head</a></code> element, and append it to the
<code><a href="semantics.html#the-html-element">html</a></code> element created in the previous step.</p>
</li><li><p>Create a <code><a href="semantics.html#the-title-element">title</a></code> element, and append it to the
<code><a href="semantics.html#the-head-element">head</a></code> element created in the previous step.</p>
</li><li><p>Create a <code><a href="infrastructure.html#text">Text</a></code> node, and set its <code title="">data</code> attribute to the string given by the method's
argument (which could be the empty string). Append it to the
<code><a href="semantics.html#the-title-element">title</a></code> element created in the previous step.</p>
</li><li><p>Create a <code><a href="sections.html#the-body-element">body</a></code> element, and append it to the
<code><a href="semantics.html#the-html-element">html</a></code> element created in the earlier step.</p>
</li><li><p>Return <var title="">doc</var>.</p></li>
</ol></div><div class="impl">
<h4 id="loading-xml-documents"><span class="secno">3.1.6 </span>Loading XML documents</h4>
<p>A <code><a href="infrastructure.html#document">Document</a></code> object that is an <a href="#xml-documents" title="XML
documents">XML document</a> that was created by the <code title="dom-DOMImplementation-createDocument"><a href="infrastructure.html#dom-domimplementation-createdocument">DOMImplementation.createDocument()</a></code>
factory method must also implement the
<code><a href="#xmldocumentloader">XMLDocumentLoader</a></code> interface:</p>
<pre class="idl">[Supplemental, NoInterfaceObject]
interface <dfn id="xmldocumentloader">XMLDocumentLoader</dfn> {
boolean <a href="#dom-xmldocumentloader-load" title="dom-XMLDocumentLoader-load">load</a>(in DOMString url);
};</pre>
<p>The <dfn id="dom-xmldocumentloader-load" title="dom-XMLDocumentLoader-load"><code>load(<var title="">url</var>)</code></dfn> method must run the following
steps:</p>
<ol><li><p>Let <var title="">document</var> be the <code><a href="infrastructure.html#document">Document</a></code>
object on which the method was invoked.</p></li>
<li><p><a href="urls.html#resolve-a-url" title="resolve a url">Resolve</a> the method's
first argument, relative to the <a href="browsers.html#entry-script">entry script</a>'s <a href="webappapis.html#script-s-base-url" title="script's base URL">base URL</a>. If this is not
successful, throw a <code><a href="common-dom-interfaces.html#syntax_err">SYNTAX_ERR</a></code> exception and abort
these steps. Otherwise, let <var title="">url</var> be the
resulting <a href="urls.html#absolute-url">absolute URL</a>.</p></li>
<li><p>If the <a href="origin-0.html#origin">origin</a> of <var title="">url</var> is not
the same as the <a href="origin-0.html#origin">origin</a> of <var title="">document</var>, throw a <code><a href="common-dom-interfaces.html#security_err">SECURITY_ERR</a></code>
exception and abort these steps.</p></li>
<li><p>Remove all child nodes of <var title="">document</var>,
without firing any mutation events.</p></li>
<li><p>Set the <a href="#current-document-readiness">current document readiness</a> of <var title="">document</var> to "loading".</p></li>
<li><p> Run the remainder of these steps asynchronously,
and return true from the method.</p></li>
<li><p>Let <var title="">result</var> be an <code><a href="infrastructure.html#document">Document</a></code>
object.</p></li>
<li><p>Let <var title="">success</var> be false.</p></li>
<li><p><a href="fetching-resources.html#fetch">Fetch</a> <var title="">url</var> from the
<a href="origin-0.html#origin">origin</a> of <var title="">document</var>, with the <i title="">synchronous flag</i> set and the <i title="">force
same-origin flag</i> set.</p></li>
<li>
<p>If the fetch attempt was successful, and the resource's <a href="fetching-resources.html#content-type" title="Content-Type">Content-Type metadata</a> is an <a href="infrastructure.html#xml-mime-type">XML
MIME type</a>, then run these substeps:</p>
<ol><li><p>Create a new <a href="the-xhtml-syntax.html#xml-parser">XML parser</a> associated with the
<var title="">result</var> document.</p></li>
<li><p>Pass this parser the fetched document.</p></li>
<li><p>If there is an XML well-formedness or XML namespace
well-formedness error, then remove all child nodes from <var title="">result</var>. Otherwise let <var title="">success</var>
be true.</p></li>
</ol></li>
<li>
<p> <a href="webappapis.html#queue-a-task">Queue a task</a> to run the following
steps. </p>
<ol><li><p>Set the <a href="#current-document-readiness">current document readiness</a> of <var title="">document</var> to "complete".</p></li>
<li><p>Replace all the children of <var title="">document</var>
by the children of <var title="">result</var> (even if it has no
children), firing mutation events as if a
<code><a href="infrastructure.html#documentfragment">DocumentFragment</a></code> containing the new children had
been inserted.</p></li>
<li><p><a href="webappapis.html#fire-a-simple-event">Fire a simple event</a> named <code title="event-load">load</code> at <var title="">document</var>.</p></li>
</ol></li>
</ol></div></body></html>