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LCWD-DOM-Parsing-20131205.html
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<!DOCTYPE html>
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</style><link href="https://www.w3.org/StyleSheets/TR/W3C-WD" rel="stylesheet"><!--[if lt IE 9]><script src='https://www.w3.org/2008/site/js/html5shiv.js'></script><![endif]--></head>
<body id="respecDocument" role="document" class="h-entry"><div id="respecHeader" role="contentinfo" class="head">
<p>
<a href="http://www.w3.org/"><img src="https://www.w3.org/Icons/w3c_home" alt="W3C" height="48" width="72"></a>
</p>
<h1 class="title p-name" id="title" property="dcterms:title">DOM Parsing and Serialization</h1>
<h2 property="bibo:subtitle" id="subtitle">DOMParser, XMLSerializer, innerHTML, and similar APIs</h2>
<h2 id="w3c-last-call-working-draft-10-december-2013" property="dcterms:issued" datatype="xsd:dateTime" content="2013-12-04T02:16:56.000Z"><abbr title="World Wide Web Consortium">W3C</abbr> Last Call Working Draft <time class="dt-published" datetime="2013-12-10">10 December 2013</time></h2>
<dl>
<dt>This version:</dt>
<dd><a class="u-url" href="http://www.w3.org/TR/2013/WD-DOM-Parsing-20131210/">http://www.w3.org/TR/2013/WD-DOM-Parsing-20131210/</a></dd>
<dt>Latest published version:</dt>
<dd><a href="http://www.w3.org/TR/DOM-Parsing/">http://www.w3.org/TR/DOM-Parsing/</a></dd>
<dt>Latest editor's draft:</dt>
<dd><a href="https://dvcs.w3.org/hg/innerhtml/raw-file/tip/index.html">https://dvcs.w3.org/hg/innerhtml/raw-file/tip/index.html</a></dd>
<dt>Test suite:</dt>
<dd><a href="https://github.com/whatwg/domparsing/tree/master/tests">https://github.com/whatwg/domparsing/tree/master/tests</a></dd>
<dt>Previous version:</dt>
<dd><a rel="dcterms:replaces" href="http://www.w3.org/TR/2012/WD-DOM-Parsing-20120920/">http://www.w3.org/TR/2012/WD-DOM-Parsing-20120920/</a></dd>
<dt>Editor:</dt>
<dd class="p-author h-card vcard" rel="bibo:editor" inlist=""><span typeof="foaf:Person"><span property="foaf:name" class="p-name fn">Travis Leithead</span>, <a rel="foaf:workplaceHomepage" class="p-org org h-org h-card" href="http://www.microsoft.com">Microsoft</a>, <span class="ed_mailto"><a class="u-email email" rel="foaf:mbox" href="mailto:[email protected]">[email protected]</a></span></span>
</dd>
<!-- <dd class="p-author h-card vcard" rel="bibo:editor" inlist=""><span typeof="foaf:Person"><span property="foaf:name" class="p-name fn">Ms2ger</span>, <a rel="foaf:workplaceHomepage" class="p-org org h-org h-card" href="http://www.mozilla.org/">Mozilla</a> (Upstream WHATWG version)</span>
</dd> -->
<!-- <dt>WHATWG Living Standard:</dt>
<dd>
<a href="http://domparsing.spec.whatwg.org/">
http://domparsing.spec.whatwg.org/
</a>
</dd> -->
</dl>
<p class="copyright">
<a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> ©
2013
<a href="http://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup>
(<a href="http://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>,
<a href="http://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>,
<a href="http://www.keio.ac.jp/">Keio</a>, <a href="http://ev.buaa.edu.cn/">Beihang</a>),
All Rights Reserved.
<abbr title="World Wide Web Consortium">W3C</abbr> <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
<a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and
<a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a>
rules apply.
</p>
<hr>
</div>
<section rel="bibo:Chapter" resource="#ref" typeof="bibo:Chapter" datatype="" property="dcterms:abstract" class="introductory" id="abstract"><h2 id="h2_abstract" role="heading" aria-level="1">Abstract</h2>
<p>This specification defines various APIs for programmatic access to
HTML and generic XML parsers by web applications for use in parsing
and serializing DOM nodes.</p>
</section><section rel="bibo:Chapter" resource="#ref" typeof="bibo:Chapter" id="sotd" class="introductory"><h2 id="h2_sotd" role="heading" aria-level="1">Status of This Document</h2>
<p>
<em>This section describes the status of this document at the time of its publication.
Other documents may supersede this document. A list of current <abbr title="World Wide Web Consortium">W3C</abbr> publications and the
latest revision of this technical report can be found in the <a href="http://www.w3.org/TR/"><abbr title="World Wide Web Consortium">W3C</abbr> technical reports index</a> at
http://www.w3.org/TR/.</em>
</p>
<p>This specification is based on the original work of the <a href="http://domparsing.spec.whatwg.org/">
DOM Parsing and Serialization</a> Living Specification, though it has diverged in terms of
supported features, normative requirements, and algorithm specificity. As appropriate,
relevant fixes from the living standard are incorporated into this document.
</p>
<p>
This document was published by the <a href="http://www.w3.org/2008/webapps/">Web Applications Working Group</a> as a Last Call Working Draft.
This document is intended to become a <abbr title="World Wide Web Consortium">W3C</abbr> Recommendation.
If you wish to make comments regarding this document, please send them to
<a href="mailto:[email protected]?subject=DOM-Parsing">[email protected]</a>
(<a href="mailto:[email protected]?subject=subscribe">subscribe</a>,
<a href="http://lists.w3.org/Archives/Public/www-dom/">archives</a>)
with <code>DOM-Parsing</code> at the start of your email's subject.
The Last Call comment period ends 07 January 2014.
All comments are welcome.
</p>
<p>
Publication as a Last Call Working Draft does not imply endorsement by the <abbr title="World Wide Web Consortium">W3C</abbr>
Membership. This is a draft document and may be updated, replaced or obsoleted by other
documents at any time. It is inappropriate to cite this document as other than work in
progress.
</p>
<p>
This is a Last Call Working Draft and thus the Working Group has determined that this
document has satisfied the relevant technical requirements and is sufficiently stable to
advance through the Technical Recommendation process.
</p>
<p>
This document was produced by a group operating under the
<a id="sotd_patent" about="" rel="w3p:patentRules" href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 <abbr title="World Wide Web Consortium">W3C</abbr> Patent
Policy</a>.
<abbr title="World Wide Web Consortium">W3C</abbr> maintains a <a href="http://www.w3.org/2004/01/pp-impl/42538/status" rel="disclosure">public list of any patent
disclosures</a>
made in connection with the deliverables of the group; that page also includes
instructions for disclosing a patent. An individual who has actual knowledge of a patent
which the individual believes contains
<a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential
Claim(s)</a> must disclose the information in accordance with
<a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section
6 of the <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
</p>
</section><section id="toc"><h2 id="h2_toc" role="heading" aria-level="1" class="introductory">Table of Contents</h2><ul id="respecContents" role="directory" class="toc"><li class="tocline"><a class="tocxref" href="#conformance"><span class="secno">1. </span>Conformance</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#dependencies"><span class="secno">1.1 </span>Dependencies</a></li><li class="tocline"><a class="tocxref" href="#extensibility"><span class="secno">1.2 </span>Extensibility</a></li></ul></li><li class="tocline"><a class="tocxref" href="#terminology"><span class="secno">2. </span>Terminology</a></li><li class="tocline"><a class="tocxref" href="#parsing-and-serializing-nodes"><span class="secno">3. </span>Parsing and serializing <span title="node" data-spec="DOM4" class="formerLink">Node</span>s</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#parsing"><span class="secno">3.1 </span>Parsing</a></li><li class="tocline"><a class="tocxref" href="#serializing"><span class="secno">3.2 </span>Serializing</a></li></ul></li><li class="tocline"><a class="tocxref" href="#the-domparser-interface"><span class="secno">4. </span>The <code>DOMParser</code> interface</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#methods"><span class="secno">4.1 </span>Methods</a></li></ul></li><li class="tocline"><a class="tocxref" href="#the-xmlserializer-interface"><span class="secno">5. </span>The <code>XMLSerializer</code> interface</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#methods-1"><span class="secno">5.1 </span>Methods</a></li></ul></li><li class="tocline"><a class="tocxref" href="#extensions-to-the-element-interface"><span class="secno">6. </span>Extensions to the <code><span title="element" data-spec="DOM4" class="formerLink">Element</span></code> interface</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#attributes"><span class="secno">6.1 </span>Attributes</a></li><li class="tocline"><a class="tocxref" href="#methods-2"><span class="secno">6.2 </span>Methods</a></li></ul></li><li class="tocline"><a class="tocxref" href="#extensions-to-the-range-interface"><span class="secno">7. </span>Extensions to the <code><span data-spec="DOM4" title="range" class="formerLink">Range</span></code> interface</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#methods-3"><span class="secno">7.1 </span>Methods</a></li></ul></li><li class="tocline"><a class="tocxref" href="#acknowledgements"><span class="secno">A. </span>Acknowledgements</a></li><li class="tocline"><a class="tocxref" href="#references"><span class="secno">B. </span>References</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#normative-references"><span class="secno">B.1 </span>Normative references</a></li><li class="tocline"><a class="tocxref" href="#informative-references"><span class="secno">B.2 </span>Informative references</a></li></ul></li></ul></section>
<section rel="bibo:Chapter" resource="#ref" typeof="bibo:Chapter" id="issues" class="introductory">
<h1 id="h1_issues" role="heading" aria-level="1">Issues</h1>
<div class="issue"><div id="h_issue_1" role="heading" aria-level="2" class="issue-title"><span>Issue 1</span></div><p class="">Open issues that appear throughout the remainder of this
document will be highlighted like this.</p></div>
<!-- I don't believe this is a point of contention anymore...
<p class="issue">This specification currently requires using the XML
Parser for some APIs, when in an XML document. It is unclear whether
consensus can be found for this approach.</p>
-->
</section>
<section rel="bibo:Chapter" resource="#ref" typeof="bibo:Chapter" id="conformance"><!--OddPage--><h2 id="h2_conformance" role="heading" aria-level="1"><span class="secno">1. </span>Conformance</h2>
<p>
As well as sections marked as non-normative, all authoring guidelines, diagrams, examples,
and notes in this specification are non-normative. Everything else in this specification is
normative.
</p>
<p>
The key words <em title="MUST" class="rfc2119">MUST</em>, <em title="MUST NOT" class="rfc2119">MUST NOT</em>, <em title="REQUIRED" class="rfc2119">REQUIRED</em>, <em title="SHOULD" class="rfc2119">SHOULD</em>, <em title="SHOULD NOT" class="rfc2119">SHOULD NOT</em>, <em title="RECOMMENDED" class="rfc2119">RECOMMENDED</em>, <em title="MAY" class="rfc2119">MAY</em>,
and <em title="OPTIONAL" class="rfc2119">OPTIONAL</em> in this specification are to be interpreted as described in [<cite><a href="#bib-RFC2119" class="bibref">RFC2119</a></cite>].
</p>
<p>Requirements phrased in the imperative as part of algorithms
(such as "strip any leading space characters" or "return false and
terminate these steps") are to be interpreted with the meaning of the
key word ("must", "should", "may", etc) used in introducing the
algorithm.</p>
<p>Conformance requirements phrased as algorithms or specific steps
may be implemented in any manner, so long as the end result is
equivalent. (In particular, the algorithms defined in this
specification are intended to be easy to follow, and not intended to
be performant.)</p>
<p id="hardwareLimitations">User agents may impose
implementation-specific limits on otherwise unconstrained inputs,
e.g. to prevent denial of service attacks, to guard against running
out of memory, or to work around platform-specific limitations.</p>
<p>When a method or an attribute is said to call another method or
attribute, the user agent must invoke its internal API for that
attribute or method so that e.g. the author can't change the behavior
by overriding attributes or methods with custom properties or functions
in ECMAScript.</p>
<p>Unless otherwise stated, string comparisons are done in a <a data-spec="DOM4" class="externalDFN" title="case-sensitive">
case-sensitive</a> manner.</p>
<p>If an algorithm calls into another algorithm, any exception that is
thrown by the latter (unless it is explicitly caught), must cause the
former to terminate, and the exception to be propagated up to
<em>its</em> caller.</p>
<section id="dependencies">
<h3 id="h3_dependencies" role="heading" aria-level="2"><span class="secno">1.1 </span>Dependencies</h3>
<p>The IDL fragments in this specification must be interpreted as
required for conforming IDL fragments, as described in the Web IDL
specification. [<cite><a href="#bib-WEBIDL" class="bibref">WEBIDL</a></cite>]</p>
<p>Some of the terms used in this specification are defined in
[<cite><a href="#bib-DOM4" class="bibref">DOM4</a></cite>], [<cite><a href="#bib-HTML5" class="bibref">HTML5</a></cite>], and [<cite><a href="#bib-XML10" class="bibref">XML10</a></cite>].
</p></section>
<section id="extensibility">
<h3 id="h3_extensibility" role="heading" aria-level="2"><span class="secno">1.2 </span>Extensibility</h3>
<p>Vendor-specific proprietary extensions to this specification are
strongly discouraged. Authors must not use such extensions, as
doing so reduces interoperability and fragments the user base,
allowing only users of specific user agents to access the content in
question.</p>
<p>If vendor-specific extensions are needed, the members should be
prefixed by vendor-specific strings to prevent clashes with future
versions of this specification. Extensions must be defined so that
the use of extensions neither contradicts nor causes the
non-conformance of functionality defined in the specification.</p>
<p>When vendor-neutral extensions to this specification are needed,
either this specification can be updated accordingly, or an
extension specification can be written that overrides the
requirements in this specification. When someone applying this
specification to their activities decides that they will recognise
the requirements of such an extension specification, it becomes an
<dfn id="dfn-other-applicable-specifications" title="other applicable specifications">applicable
specification</dfn> for the purposes of conformance requirements in
this specification.</p>
<!-- http://www.w3.org/mid/[email protected] -->
</section>
</section>
<section id="terminology">
<!--OddPage--><h2 id="h2_terminology" role="heading" aria-level="1"><span class="secno">2. </span>Terminology</h2>
<p>The term <dfn id="dfn-context-object">context object</dfn> means the object on which the method or
attribute being discussed was called.
</p></section>
<section id="parsing-and-serializing-nodes">
<!--OddPage--><h2 id="h2_parsing-and-serializing-nodes" role="heading" aria-level="1"><span class="secno">3. </span>Parsing and serializing <a title="node" data-spec="DOM4" class="externalDFN">Node</a>s</h2>
<section id="parsing">
<h3 id="h3_parsing" role="heading" aria-level="2"><span class="secno">3.1 </span>Parsing</h3>
<p>The following steps form the
<dfn id="dfn-concept-parse-fragment" title="concept-parse-fragment">fragment parsing algorithm</dfn>, whose
arguments are a <var>markup</var> string and a
<var>context element</var>.
</p><ol>
<li>
<p>If the <var>context element</var>'s
<a title="concept-node-document" data-spec="DOM4" class="externalDFN">node document</a>
is an <a title="html-document" data-spec="DOM4" class="externalDFN">HTML document</a>: let
<var>algorithm</var> be the
<a title="html-fragment-parsing-algorithm" data-spec="HTML5" class="externalDFN">HTML
fragment parsing algorithm</a>.</p>
<p>If the <var>context element</var>'s
<a title="concept-node-document" data-spec="DOM4" class="externalDFN">node document</a>
is an <a title="xml-document" data-spec="DOM4" class="externalDFN">XML document</a>: let
<var>algorithm</var> be the
<a title="xml-fragment-parsing-algorithm" data-spec="HTML5" class="externalDFN">XML
fragment parsing algorithm</a>.</p>
</li>
<li>Invoke <var>algorithm</var> with <var>markup</var> as
the <var>input</var>, and <var>context element</var> as the
<var><a data-spec="HTML5" title="concept-frag-parse-context" class="externalDFN">context</a></var>
element.</li>
<li>Let <var>new children</var> be the nodes returned.</li>
<li>Let <var>fragment</var> be a new
<code><a title="documentfragment" data-spec="DOM4" class="externalDFN">DocumentFragment</a></code> whose
<a title="concept-node-document" data-spec="DOM4" class="externalDFN">node document</a>
is <var>context element</var>'s
<a title="concept-node-document" data-spec="DOM4" class="externalDFN">node document</a>.
</li><li><a data-spec="DOM4" title="concept-node-append" class="externalDFN">Append</a>
each <a data-spec="DOM4" title="concept-node" class="externalDFN">node</a> in
<var>new children</var> to <var>fragment</var> (in order).
<div class="note"><div id="h_note_1" role="heading" aria-level="3" class="note-title"><span>Note</span></div><p class="">This ensures the
<a title="concept-node-document" data-spec="DOM4" class="externalDFN">node document</a>
for the new <a data-spec="DOM4" title="concept-node" class="externalDFN">nodes</a> is correct.
</p></div></li><li>Return <var>fragment</var>.
</li></ol>
</section>
<section id="serializing">
<h3 id="h3_serializing" role="heading" aria-level="2"><span class="secno">3.2 </span>Serializing</h3>
<p>To <dfn id="dfn-concept-serialize" title="concept-serialize">serialize</dfn> a
<a title="node" data-spec="DOM4" class="externalDFN">Node</a> <var>node</var>, the user agent
must run the following steps:
</p><ol>
<li>Let <var>document</var> be <var>node</var>'s
<a title="concept-node-document" data-spec="DOM4" class="externalDFN">node document</a>.
</li><li>If <var>document</var> is an
<a title="html-document" data-spec="DOM4" class="externalDFN">HTML document</a>,
return an <a class="internalDFN" href="#dfn-concept-serialize-html" title="concept-serialize-html">HTML serialization</a> of <var>node</var>.
</li><li>Otherwise, <var>document</var> is an
<a title="xml-document" data-spec="DOM4" class="externalDFN">XML document</a>.
</li><li>Let <var>context namespace</var> be <code>null</code>.
</li><li>Let <var>prefix list</var> be an empty list. The <var>prefix list</var> will
contain strings that represent a history of namespace prefixes [<cite><a href="#bib-XML-NAMES" class="bibref">XML-NAMES</a></cite>]
that have been serialized by the <a class="internalDFN" href="#dfn-concept-serialize-xml" title="concept-serialize-xml">XML serialization</a>
algorithm for a subtree.
</li><li>Return an <a class="internalDFN" href="#dfn-concept-serialize-xml" title="concept-serialize-xml">XML serialization</a> of <var>node</var>
providing to the algorithm <var>context namespace</var> as the <var>namespace</var>
and <var>prefix list</var> as <var>prefixes</var>.
</li></ol>
<p>To produce an <dfn id="dfn-concept-serialize-html" title="concept-serialize-html">HTML serialization</dfn> of a
<a title="node" data-spec="DOM4" class="externalDFN">Node</a> <var>node</var>, the user agent
must run the
<a data-spec="HTML5" title="html-fragment-serialization-algorithm" class="externalDFN">HTML
fragment serialization algorithm</a> [<cite><a href="#bib-HTML5" class="bibref">HTML5</a></cite>] on <var>node</var> and return the string produced.
</p><p>To produce an <dfn id="dfn-concept-serialize-xml" title="concept-serialize-xml">XML serialization</dfn> of a
<a title="node" data-spec="DOM4" class="externalDFN">Node</a> <var>node</var> given a
context namespace <var>namespace</var> and prefix list <var>prefixes</var>, the user
agent must run the appropriate steps, depending on <var>node</var>'s interface:</p>
<div class="note"><div id="h_note_2" role="heading" aria-level="3" class="note-title"><span>Note</span></div><p class="">The following steps for serializing a <var>node</var> belonging to an
<a title="xml-document" data-spec="DOM4" class="externalDFN">XML document</a> are
designed to produce a serialization that is compatible with the
<a title="html-parser" data-spec="HTML5" class="externalDFN">HTML parser</a>. For example,
elements in the XHTML namespace that contain no child nodes are serialized with
an explicit begin and end tag rather than using the XML self-closing syntax. Exceptions
to this rule occur when an XHTML element's equivalent HTML element is a
<a title="void-elements" data-spec="HTML5" class="externalDFN">void element</a> that
would be auto-closed by the
<a title="html-parser" data-spec="HTML5" class="externalDFN">HTML parser</a>.
</p></div><dl class="switch">
<dt><code><a title="element" data-spec="DOM4" class="externalDFN">Element</a></code>
</dt><dd>
<p>Run the following algorithm:
</p><ol>
<!-- "namespace" was passed via the caller -->
<li>Let <var>markup</var> be an empty string.
</li><li>Let <var>list</var> be a copy of the <var>prefixes</var> array.
</li><li>Let <var>prefix</var> be the value of <var>node</var>'s
<code><a title="dom-Element-prefix" data-spec="DOM4" class="externalDFN">prefix</a></code>
attribute.
</li><li>Let <var>ns</var> be the value of <var>node</var>'s
<code><a title="dom-Element-namespaceURI" data-spec="DOM4" class="externalDFN">namespaceURI</a></code>
attribute.
</li><li>Let a <var>skip end tag</var> flag have the value <code>false</code>.
</li><li>Append "<code><</code>" (U+003C LESS-THAN SIGN) to <var>markup</var>.
</li><li>If <var>prefix</var> is not <code>null</code> then append the following to
<var>markup</var>:
<ol>
<li>The value of <var>prefix</var>;
</li><li>"<code>:</code>" (U+003A COLON).
</li></ol>
</li><li>Append the value of <var>node</var>'s
<code><a title="dom-Element-localName" data-spec="DOM4" class="externalDFN">localName</a></code>
attribute to <var>markup</var>.
<!-- Tried ":" in names, but this doesn't trick the serializer-it just produces
a serialization that is not round-trippable
<p class="issue">escaping / throwing -->
</li><li>If <var>namespace</var> is not equal to <var>ns</var> (the <var>node</var>'s
own namespace is different from its parent), and <var>prefix</var> is not
<code>null</code>, then run these sub-steps:
<div class="note"><div id="h_note_3" role="heading" aria-level="3" class="note-title"><span>Note</span></div><p class="">These steps determine whether a namespace prefix is
serialized for this node.
</p></div><ol>
<li>If <var>list</var> contains the value of <var>prefix</var>, then
abort these sub-steps. This namespace prefix
was already serialized.
</li><li>Add the value of <var>prefix</var> to <var>list</var>.
</li><li>If <var>node</var> has an attribute whose
<a title="concept-attribute-name" data-spec="DOM4" class="externalDFN">name</a>
attribute value is equal to the concatenation of the string
"<code>xmlns:</code>" with the value of <var>prefix</var>, abort
these sub-steps. The <var>prefix</var> namespace definition will be
serialized later as part of the <a class="internalDFN" href="#dfn-concept-serialize-xml-attributes" title="concept-serialize-xml-attributes">XML
serialization of <var>node</var>'s attributes</a>.
</li><li>Append the following to <var>markup</var>, in order:
<ol>
<li>"<code> </code>" (U+0020 SPACE);
</li><li>The string "<code>xmlns:</code>";
</li><li>The value of <var>prefix</var>;
</li><li>"<code>="</code>" (U+003D EQUALS SIGN, U+0022 QUOTATION MARK);
</li><li>The value of <var>ns</var>;
</li><li>"<code>"</code>" (U+0022 QUOTATION MARK);
</li></ol>
</li></ol>
</li><li>If <var>namespace</var> is not equal to <var>ns</var>, and <var>prefix</var>
is <code>null</code>, then run these sub-steps:
<div class="note"><div id="h_note_4" role="heading" aria-level="3" class="note-title"><span>Note</span></div><p class="">These steps determine whether a default namespace is
serialized for this node.
</p></div><ol>
<li>If <var>node</var> has an attribute whose
<a title="concept-attribute-name" data-spec="DOM4" class="externalDFN">name</a>
attribute value is equal to "<code>xmlns</code>", abort
these sub-steps. The default namespace will be
serialized later as part of the <a class="internalDFN" href="#dfn-concept-serialize-xml-attributes" title="concept-serialize-xml-attributes">XML
serialization of <var>node</var>'s attributes</a>.
</li><li>Append the following to <var>markup</var>, in order:
<ol>
<li>"<code> </code>" (U+0020 SPACE);
</li><li>The string "<code>xmlns</code>";
</li><li>"<code>="</code>" (U+003D EQUALS SIGN, U+0022 QUOTATION MARK);
</li><li>The value of <var>ns</var>;
</li><li>"<code>"</code>" (U+0022 QUOTATION MARK);
</li></ol>
</li></ol>
</li><li>Append to <var>markup</var> the result of the
<a class="internalDFN" href="#dfn-concept-serialize-xml-attributes" title="concept-serialize-xml-attributes">XML
serialization of <var>node</var>'s attributes</a>, passing <var>list</var>
as the <var>prefixes</var>.
</li><li>If the value of <var>ns</var> is the string "<code>http://www.w3.org/1999/xhtml</code>",
and the <var>node</var>'s list of
<a title="concept-tree-child" data-spec="DOM4" class="externalDFN">children</a>
is empty, and the <var>node</var>'s
<code><a title="dom-Element-tagName" data-spec="DOM4" class="externalDFN">tagName</a></code>
matches any one of the following
<a title="void-elements" data-spec="HTML5" class="externalDFN">void elements</a>:
"<code>area</code>",
"<code>base</code>",
"<code>br</code>",
"<code>col</code>",
"<code>embed</code>",
"<code>hr</code>",
"<code>img</code>",
"<code>input</code>",
"<code>keygen</code>",
"<code>link</code>",
"<code>menuitem</code>",
"<code>meta</code>",
"<code>param</code>",
"<code>source</code>",
"<code>track</code>",
"<code>wbr</code>";
then append the following to <var>markup</var>, in order:
<ol>
<li>"<code> </code>" (U+0020 SPACE);
</li><li>"<code>/</code>" (U+002F SOLIDUS);
</li></ol>
and set the <var>skip end tag</var> flag to <code>true</code>.
</li><li>If the value of <var>ns</var> is not the string "<code>http://www.w3.org/1999/xhtml</code>",
and the <var>node</var>'s list of
<a title="concept-tree-child" data-spec="DOM4" class="externalDFN">children</a>
is empty, then append "<code>/</code>" (U+002F SOLIDUS) to <var>markup</var>
and set the <var>skip end tag</var> flag to <code>true</code>.
</li><li>Append "<code>></code>" (U+003E GREATER-THAN SIGN) to <var>markup</var>.
</li><li>If the value of <var>skip end tag</var> is <code>true</code>, then return
the value of <var>markup</var> and skip the remaining steps. The
<var>node</var> is a leaf-node.
</li><li>Append to <var>markup</var> the result of performing an
<a class="internalDFN" href="#dfn-concept-serialize-xml" title="concept-serialize-xml">XML serialization</a> of each of
<var>node</var>'s
<a title="concept-tree-child" data-spec="DOM4" class="externalDFN">children</a>,
in order, providing the value of <var>ns</var> for the <var>namespace</var>
and <var>list</var> for the <var>prefixes</var>.
</li><li>Append "<code></</code>" (U+003C LESS-THAN SIGN, U+002F SOLIDUS) to
<var>markup</var>.
</li><li>If the value of <var>prefix</var> is not <code>null</code>, then append the
following to <var>markup</var>, in order:
<ol>
<li>The value of <var>prefix</var>;
</li><li>"<code>:</code>" (U+003A COLON).
</li></ol>
</li><li>Append the value of <var>node</var>'s
<code><a title="dom-Element-localName" data-spec="DOM4" class="externalDFN">localName</a></code>
attribute to <var>markup</var>.
</li><li>Append "<code>></code>" (U+003E GREATER-THAN SIGN) to <var>markup</var>.
</li><li>Return the value of <var>markup</var>.
</li></ol>
</dd><dt><code><a title="document" data-spec="DOM4" class="externalDFN">Document</a></code>
</dt><dd>
<p>Return the result of concatenating the following, in order:
</p><ol>
<li>The string produced by running the steps to
<a class="internalDFN" href="#dfn-concept-serialize-doctype" title="concept-serialize-doctype">produce a DocumentType serialization</a>
of <var>node</var>'s
<a title="dom-Document-doctype" data-spec="HTML5" class="externalDFN">doctype</a>
attribute;
</li><li>The string produced by an <a class="internalDFN" href="#dfn-concept-serialize-xml" title="concept-serialize-xml">XML serialization</a>
of <var>node</var>'s
<a title="dom-Document-documentElement" data-spec="HTML5" class="externalDFN">documentElement</a>
attribute, providing <code>null</code> as the <var>namespace</var> and an
empty list as <var>prefixes</var>.
</li></ol>
</dd><dt><code><a title="comment" data-spec="DOM4" class="externalDFN">Comment</a></code>
</dt><dd><ol>
<li>Let <var>markup</var> be the concatenation of "<code><!--</code>", <var>node</var>'s
<code><a title="dom-characterdata-data" data-spec="DOM4" class="externalDFN">data</a></code>, and
"<code>--></code>".
</li><li>If <var>markup</var> matches the
<code><a data-spec="XML10" title="comment" class="externalDFN">Comment</a></code> production, return
<var>markup</var>. Otherwise, throw a
<code><a title="domexception" data-spec="DOM4" class="externalDFN">DOMException</a></code>
with name <code>InvalidStateError</code>.
</li></ol>
</dd><dt><code><a title="cdata" data-spec="DOML2" class="externalDFN">CDATASection</a></code>
</dt><dd><ol>
<li>Let <var>markup</var> be the concatenation of "<code><![CDATA[</code>",
<var>node</var>'s
<code><a title="dom-characterdata-data" data-spec="DOM4" class="externalDFN">data</a></code>,
and "<code>]]></code>".