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|
<!DOCTYPE HTML>
<html lang="en-GB-hixie">
<head>
<title>HTML 5</title>
<link href="/style/specification" type="text/css" rel="stylesheet">
<link href="/images/icon" rel="icon">
<style type="text/css">
h4 + .element { margin-top: -2.5em; padding-top: 2em; }
h4 + p + .element { margin-top: -5em; padding-top: 4em; }
.element { background: #EEFFEE; color: black; margin: 0 0 1em -1em; padding: 0 1em 0.25em 0.75em; border-left: solid #99FF99 0.25em; -padding: 0; /* that last decl is for IE6. Try removing it, it's hilarious! */ }
.proposal { border: blue solid; padding: 1em; }
table.matrix, table.matrix td { border: none; text-align: right; }
table.matrix { margin-left: 2em; }
</style>
<link href="section-tokenisation.html#nav-bar" rel="prev" title="8.2.3. Tokenisation"><link href="index.html#contents" rel="index" title="Table of contents"><link href="section-namespaces.html#nav-bar" rel="next" title="8.3. Namespaces"></head><body class="draft"><div class="head">
<p><a href="http://www.whatwg.org/" class="logo" rel="home"><img src="/images/logo" alt="WHATWG"></a></p>
<h1 id="html-5">HTML 5</h1>
<h2 id="working" class="no-num no-toc">Working Draft — 12 June 2007</h2></div><nav id="nav-bar"><a href="section-tokenisation.html#nav-bar">< 8.2.3. Tokenisation</a> – <a href="index.html#contents">Table of contents</a> – <a href="section-namespaces.html#nav-bar">8.3. Namespaces ></a></nav><h4 id="tree-construction"><span class="secno">8.2.4. </span><dfn id="tree-construction0">Tree construction</dfn></h4>
<p>The input to the tree construction stage is a sequence of tokens from
the <a href="section-tokenisation.html#tokenisation0">tokenisation</a> stage. The tree construction
stage is associated with a DOM <code>Document</code> object when a parser
is created. The "output" of this stage consists of dynamically modifying
or extending that document's DOM tree.
</p><p>Tree construction passes through several phases. Initially, UAs must act
according to the steps described as being those of <a href="#the-initial0">the initial phase</a>.
</p><p>This specification does not define when an interactive user agent has to
render the <code>Document</code> available to the user, or when it has to
begin accepting user input.
</p><p>When the steps below require the UA to <dfn id="append">append a
character</dfn> to a node, the UA must collect it and all subsequent
consecutive characters that would be appended to that node, and insert one
<code>Text</code> node whose data is the concatenation of all those
characters.
</p><p id="mutation-during-parsing">DOM mutation events must not fire for changes
caused by the UA parsing the document. (Conceptually, the parser is not
mutating the DOM, it is constructing it.) This includes the parsing of any
content inserted using <code title="dom-document-write-HTML"><a href="section-dynamic.html#document.write0">document.write()</a></code> and <code title="dom-document-writeln"><a href="section-dynamic.html#document.writeln">document.writeln()</a></code> calls.<!--
XXX xref -->
<a href="#refsDOM3EVENTS">[DOM3EVENTS]</a></p>
<!-- XXX
what abotu innerHTML? -->
<p class="note">Not all of the tag names mentioned below are conformant tag
names in this specification; many are included to handle legacy content.
They still form part of the algorithm that implementations are required to
implement to claim conformance.
</p><p class="note">The algorithm described below places no limit on the depth of
the DOM tree generated, or on the length of tag names, attribute names,
attribute values, text nodes, etc. While implementators are encouraged to
avoid arbitrary limits, it is recognised that <a href="section-conformance.html#hardwareLimitations">practical concerns</a> will likely force user
agents to impose nesting depths.
</p><h5 id="the-initial"><span class="secno">8.2.4.1. </span><dfn id="the-initial0">The initial phase</dfn></h5>
<p>Initially, the tree construction stage must handle each token emitted
from the <a href="section-tokenisation.html#tokenisation0">tokenisation</a> stage as follows:
</p><dl class="switch">
<dt>A DOCTYPE token that is marked as being in error
</dt><dt>A comment token
</dt><dt>A start tag token
</dt><dt>An end tag token
</dt><dt>A character token that is not one of one of U+0009 CHARACTER
TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM
FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dt>An end-of-file token
</dt><dd>
<p>This specification does not define how to handle this case. In
particular, user agents may ignore the entirety of this specification
altogether for such documents, and instead invoke special parse modes
with a greater emphasis on backwards compatibility.</p>
<div class="note">
<p>Browsers in particular have generally used DOCTYPE-based sniffing to
invoke an "alternative conformance mode" known as <em>quirks mode</em>
on certain documents. In this mode, emphasis is put on legacy
compatibility rather than on standards compliance. This specification
takes no position on this behaviour; documents without DOCTYPEs or with
DOCTYPEs that do not conform to the syntax allowed by this
specification are considered to be out of scope of this specification.</p>
</div>
<div class="big-issue">
<p>As far as parsing goes, the quirks I know of are:</p>
<ul>
<li>Comment parsing is different.
</li><li>The following is considered one script block (!):
<pre><script><!-- document.write('</script>'); --></script></pre>
</li><li><code title=""></br></code> and <code title=""></p></code> do
magical things.
</li><li><code><a href="section-prose.html#p">p</a></code> can contain <code><a href="section-tabular.html#table">table</a></code>
</li><li>Safari and IE have special parsing rules for <% ... %> (even
in standards mode, though clearly this should be quirks-only).
</li></ul>
<p>Maybe we should just adopt all those and be done with it. One parsing
mode to rule them all. Or legitimise/codify the quirks mode parsing in
some way.</p>
<p>Would be interesting to do a search to see how many pages hit each of
the above.</p>
<!-- biased by page rank? --></div>
</dd><dt>A DOCTYPE token marked as being correct
</dt><dd>
<p>Append a <code>DocumentType</code> node to the <code>Document</code>
node, with the <code title="">name</code> attribute set to the name
given in the DOCTYPE token (which will be "HTML"), and the other
attributes specific to <code>DocumentType</code> objects set to null,
empty lists, or the empty string as appropriate.</p>
<p>Then, switch to <a href="#the-root1">the root element phase</a> of the
tree construction stage.</p>
<!-- XXX should set doctype on the Document object, too, unless
spec is defined to already point to it if you append -->
</dd><dt>A character token that <em>is</em> one of one of U+0009 CHARACTER
TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM
FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dd>
<p><a href="#append" title="append a character">Append that character</a>
to the <code>Document</code> node.</p>
</dd></dl>
<h5 id="the-root0"><span class="secno">8.2.4.2. </span><dfn id="the-root1">The
root element phase</dfn></h5>
<p>After <a href="#the-initial0">the initial phase</a>, as each token is
emitted from the <a href="section-tokenisation.html#tokenisation0">tokenisation</a> stage, it must
be processed as described in this section.
</p><dl class="switch">
<dt>A DOCTYPE token
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd><dt>A comment token
</dt><dd>
<p>Append a <code>Comment</code> node to the <code>Document</code> object
with the <code title="">data</code> attribute set to the data given in
the comment token.</p>
</dd><dt>A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dd>
<p><a href="#append" title="append a character">Append that character</a>
to the <code>Document</code> node.</p>
</dd><dt>A character token that is <em>not</em> one of U+0009 CHARACTER
TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM
FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dt>A start tag token
</dt><dt>An end tag token
</dt><dt>An end-of-file token
</dt><dd>
<p>Create an <code><a href="section-elements.html#htmlelement">HTMLElement</a></code> node
with the tag name <code><a href="section-the-root.html#html">html</a></code>, in the <a href="section-namespaces.html#html-namespace0">HTML namespace</a>. Append it to the
<code>Document</code> object. Switch to <a href="#the-main0">the main
phase</a> and reprocess the current token.</p>
<p class="big-issue">Should probably make end tags be ignored, so that
"</head><!-- --><html>" puts the comment befor the root node
(or should we?)</p>
</dd></dl>
<p>The root element can end up being removed from the <code>Document</code>
object, e.g. by scripts; nothing in particular happens in such cases,
content continues being appended to the nodes as described in the next
section.
</p><h5 id="the-main"><span class="secno">8.2.4.3. </span><dfn id="the-main0">The
main phase</dfn></h5>
<p>After <a href="#the-root1">the root element phase</a>, each token
emitted from the <a href="section-tokenisation.html#tokenisation0">tokenisation</a> stage must be
processed as described in <em>this</em> section. This is by far the most
involved part of parsing an HTML document.
</p><p>The tree construction stage in this phase has several pieces of state: a
<a href="#stack">stack of open elements</a>, a <a href="#list-of4">list of
active formatting elements</a>, a <a href="#head-element"><code title="">head</code> element pointer</a>, a <a href="#form-element"><code title="">form</code> element pointer</a>, and an <a href="#insertion0">insertion mode</a>.
</p><p class="big-issue">We could just fold insertion modes and phases into one
concept (and duplicate the two rules common to all insertion modes into
all of them).
</p><h6 id="the-stack"><span class="secno">8.2.4.3.1. </span>The stack of open
elements</h6>
<p>Initially the <dfn id="stack">stack of open elements</dfn> contains just
the <code><a href="section-the-root.html#html">html</a></code> root element node created in the
<a href="#the-root1" title="the root element phase">last phase</a> before
switching to <em>this</em> phase (or, in the <a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>, the <code><a href="section-the-root.html#html">html</a></code> element created to represent the element
whose <code title="dom-innerHTML-HTML"><a href="section-dynamic.html#innerhtml0">innerHTML</a></code> attribute is being set). That's
the topmost node of the stack. It never gets popped off the stack. (This
stack grows downwards.)
</p><p>The <dfn id="current4">current node</dfn> is the bottommost node in this
stack.
</p><p>Elements in the stack fall into the following categories:
</p><dl>
<dt><dfn id="special">Special</dfn>
</dt><dd>
<p>The following HTML elements have varying levels of special parsing
rules: <code><a href="section-sections.html#address">address</a></code>, <code><a href="section-the-canvas.html#area">area</a></code>, <code><a href="section-document.html#base">base</a></code>,
<code>basefont</code>, <code>bgsound</code>, <code><a href="section-sections.html#blockquote">blockquote</a></code>, <code><a href="section-sections.html#body0">body</a></code>, <code><a href="section-prose.html#br">br</a></code>,
<code>center</code>, <code><a href="section-tabular.html#col">col</a></code>, <code><a href="section-tabular.html#colgroup">colgroup</a></code>, <code><a href="section-lists0.html#dd">dd</a></code>,
<code>dir</code>, <code><a href="section-miscellaneous.html#div">div</a></code>, <code><a href="section-lists0.html#dl">dl</a></code>, <code><a href="section-lists0.html#dt">dt</a></code>, <code><a href="section-embedded.html#embed">embed</a></code>, <code>fieldset</code>,
<code>form</code>, <code>frame</code>, <code>frameset</code>, <code><a href="section-sections.html#h1">h1</a></code>, <code><a href="section-sections.html#h2">h2</a></code>, <code><a href="section-sections.html#h3">h3</a></code>, <code><a href="section-sections.html#h4">h4</a></code>, <code><a href="section-sections.html#h5">h5</a></code>, <code><a href="section-sections.html#h6">h6</a></code>, <code><a href="section-document.html#head">head</a></code>, <code><a href="section-prose.html#hr">hr</a></code>,
<code><a href="section-embedded.html#iframe">iframe</a></code>,
<code>image</code><!-- XXX ? this isn't an element that can end up
on the stack-->,
<code><a href="section-embedded.html#img">img</a></code>, <code>input</code>,
<code>isindex</code>, <code><a href="section-lists0.html#li">li</a></code>, <code><a href="section-document.html#link">link</a></code>, <code>listing</code>, <code><a href="section-the-command.html#menu">menu</a></code>, <code><a href="section-document.html#meta0">meta</a></code>,
<code>noembed</code>, <code>noframes</code>, <code><a href="section-scripting0.html#noscript">noscript</a></code>, <code><a href="section-lists0.html#ol">ol</a></code>,
<code>optgroup</code>, <code>option</code>, <code><a href="section-prose.html#p">p</a></code>, <code><a href="section-embedded.html#param">param</a></code>,
<code>plaintext</code>, <code><a href="section-preformatted.html#pre">pre</a></code>, <code><a href="section-scripting0.html#script0">script</a></code>, <code>select</code>,
<code>spacer</code>, <code><a href="section-document.html#style">style</a></code>, <code><a href="section-tabular.html#tbody">tbody</a></code>, <code>textarea</code>, <code><a href="section-tabular.html#tfoot0">tfoot</a></code>, <code><a href="section-tabular.html#thead0">thead</a></code>, <code><a href="section-document.html#title1">title</a></code>, <code><a href="section-tabular.html#tr">tr</a></code>,
<code><a href="section-lists0.html#ul">ul</a></code>, and <code>wbr</code>.
</p></dd><dt><dfn id="scoping">Scoping</dfn>
</dt><dd>
<p>The following HTML elements introduce new <a href="#have-an" title="has an element in scope">scopes</a> for various parts of the
parsing: <code>button</code>, <code><a href="section-tabular.html#caption0">caption</a></code>, <code><a href="section-the-root.html#html">html</a></code>, <code>marquee</code>, <code><a href="section-embedded.html#object">object</a></code>, <code><a href="section-tabular.html#table">table</a></code>, <code><a href="section-tabular.html#td">td</a></code> and
<code><a href="section-tabular.html#th">th</a></code>.
</p></dd><dt><dfn id="formatting">Formatting</dfn>
</dt><dd>
<p>The following HTML elements are those that end up in the <a href="#list-of4">list of active formatting elements</a>: <code><a href="section-phrase.html#a">a</a></code>, <code><a href="section-phrase.html#b">b</a></code>,
<code>big</code>, <code><a href="section-phrase.html#em">em</a></code>, <code><a href="section-presentational.html#font">font</a></code>, <code><a href="section-phrase.html#i">i</a></code>,
<code>nobr</code>, <code>s</code>, <code><a href="section-phrase.html#small">small</a></code>, <code>strike</code>, <code><a href="section-phrase.html#strong">strong</a></code>, <code>tt</code>, and <code>u</code>.
</p></dd><dt><dfn id="phrasing">Phrasing</dfn>
</dt><dd>
<p>All other elements found while parsing an HTML document.
</p></dd></dl>
<p class="big-issue">Still need to add these new elements to the lists:
<code><a href="section-scripting0.html#event-source">event-source</a></code>, <code><a href="section-sections.html#section">section</a></code>, <code><a href="section-sections.html#nav">nav</a></code>,
<code><a href="section-sections.html#article">article</a></code>, <code><a href="section-sections.html#aside">aside</a></code>, <code><a href="section-sections.html#header">header</a></code>,
<code><a href="section-sections.html#footer">footer</a></code>, <code><a href="section-interactive.html#datagrid0">datagrid</a></code>, <code><a href="section-the-command.html#command0">command</a></code>
</p><p>The <a href="#stack">stack of open elements</a> is said to <dfn id="have-an" title="has an element in scope">have an element in scope</dfn>
or <dfn id="have-an0" title="has an element in table scope">have an element
in <em>table scope</em></dfn> when the following algorithm terminates in a
match state:
</p><ol>
<li>
<p>Initialise <var title="">node</var> to be the <a href="#current4">current node</a> (the bottommost node of the stack).
</p></li><li>
<p>If <var title="">node</var> is the target node, terminate in a match
state.
</p></li><li>
<p>Otherwise, if <var title="">node</var> is a <code><a href="section-tabular.html#table">table</a></code> element, terminate in a failure state.
</p></li><li>
<p>Otherwise, if the algorithm is the "has an element in scope" variant
(rather than the "has an element in table scope" variant), and <var title="">node</var> is one of the following, terminate in a failure
state:</p>
<ul class="brief">
<li><code><a href="section-tabular.html#caption0">caption</a></code>
</li><li><code><a href="section-tabular.html#td">td</a></code>
</li><li><code><a href="section-tabular.html#th">th</a></code>
</li><li><code>button</code>
</li><li><code>marquee</code>
</li><li><code><a href="section-embedded.html#object">object</a></code>
</li></ul>
</li><li>
<p>Otherwise, if <var title="">node</var> is an <code><a href="section-the-root.html#html">html</a></code> element, terminate in a failure state.
(This can only happen if the <var title="">node</var> is the topmost
node of the <a href="#stack">stack of open elements</a>, and prevents
the next step from being invoked if there are no more elements in the
stack.)
</p></li><li>
<p>Otherwise, set <var title="">node</var> to the previous entry in the
<a href="#stack">stack of open elements</a> and return to step 2. (This
will never fail, since the loop will always terminate in the previous
step if the top of the stack is reached.)
</p></li></ol>
<p>Nothing happens if at any time any of the elements in the <a href="#stack">stack of open elements</a> are moved to a new location in,
or removed from, the <code>Document</code> tree. In particular, the stack
is not changed in this situation. This can cause, amongst other strange
effects, content to be appended to nodes that are no longer in the DOM.
</p><p class="note">In some cases (namely, when <a href="#adoptionAgency">closing
misnested formatting elements</a>), the stack is manipulated in a
random-access fashion.
</p><h6 id="the-list"><span class="secno">8.2.4.3.2. </span>The list of active
formatting elements</h6>
<p>Initially the <dfn id="list-of4">list of active formatting elements</dfn>
is empty. It is used to handle mis-nested <a href="#formatting" title="formatting">formatting element tags</a>.
</p><p>The list contains elements in the <a href="#formatting">formatting</a>
category, and scope markers. The scope markers are inserted when entering
buttons, <code><a href="section-embedded.html#object">object</a></code> elements, marquees,
table cells, and table captions, and are used to prevent formatting from
"leaking" into tables, buttons, <code><a href="section-embedded.html#object">object</a></code>
elements, and marquees.
</p><p>When the steps below require the UA to <dfn id="reconstruct">reconstruct
the active formatting elements</dfn>, the UA must perform the following
steps:
</p><ol>
<li>If there are no entries in the <a href="#list-of4">list of active
formatting elements</a>, then there is nothing to reconstruct; stop this
algorithm.
</li><li>If the last (most recently added) entry in the <a href="#list-of4">list of active formatting elements</a> is a marker, or
if it is an element that is in the <a href="#stack">stack of open
elements</a>, then there is nothing to reconstruct; stop this algorithm.
</li><li>Let <var title="">entry</var> be the last (most recently added)
element in the <a href="#list-of4">list of active formatting
elements</a>.
</li><li>If there are no entries before <var title="">entry</var> in the <a href="#list-of4">list of active formatting elements</a>, then jump to
step 8.
</li><li>Let <var title="">entry</var> be the entry one earlier than <var title="">entry</var> in the <a href="#list-of4">list of active formatting
elements</a>.
</li><li>If <var title="">entry</var> is neither a marker nor an element that
is also in the <a href="#stack">stack of open elements</a>, go to step 4.
</li><li>Let <var title="">entry</var> be the element one later than <var title="">entry</var> in the <a href="#list-of4">list of active formatting
elements</a>.
</li><li>Perform a shallow clone of the element <var title="">entry</var> to
obtain <var title="">clone</var>. <a href="#refsDOM3CORE">[DOM3CORE]</a>
</li><li>Append <var title="">clone</var> to the <a href="#current4">current
node</a> and push it onto the <a href="#stack">stack of open elements</a>
so that it is the new <a href="#current4">current node</a>.
</li><li>Replace the entry for <var title="">entry</var> in the list with an
entry for <var title="">clone</var>.
</li><li>If the entry for <var title="">clone</var> in the <a href="#list-of4">list of active formatting elements</a> is not the last
entry in the list, return to step 7.
</li></ol>
<p>This has the effect of reopening all the formatting elements that were
opened in the current body, cell, or caption (whichever is youngest) that
haven't been explicitly closed.
</p><p class="note">The way this specification is written, the <a href="#list-of4">list of active formatting elements</a> always consists of
elements in chronological order with the least recently added element
first and the most recently added element last (except for while steps 8
to 11 of the above algorithm are being executed, of course).
</p><p>When the steps below require the UA to <dfn id="clear0">clear the list of
active formatting elements up to the last marker</dfn>, the UA must
perform the following steps:
</p><ol>
<li>Let <var title="">entry</var> be the last (most recently added) entry
in the <a href="#list-of4">list of active formatting elements</a>.
</li><li>Remove <var title="">entry</var> from the <a href="#list-of4">list of
active formatting elements</a>.
</li><li>If <var title="">entry</var> was a marker, then stop the algorithm at
this point. The list has been cleared up to the last marker.
</li><li>Go to step 1.
</li></ol>
<h6 id="creating"><span class="secno">8.2.4.3.3. </span>Creating and inserting
HTML elements</h6>
<p>When the steps below require the UA to <dfn id="create" title="create an
element for the token">create an element for a token</dfn>, the UA must
create a node implementing the interface appropriate for the element type
corresponding to the tag name of the token (as given in the section of
this specification that defines that element, e.g. for an <code><a href="section-phrase.html#a">a</a></code> element it would be the <code><a href="section-phrase.html#htmlanchorelement">HTMLAnchorElement</a></code> interface), with
the tag name being the name of that element, with the node being in the <a href="section-namespaces.html#html-namespace0">HTML namespace</a>, and with the attributes on the
node being those given in the given token.
</p><p>When the steps below require the UA to <dfn id="insert">insert an HTML
element</dfn> for a token, the UA must first <a href="#create">create an
element for the token</a>, and then append this node to the <a href="#current4">current node</a>, and push it onto the <a href="#stack">stack of open elements</a> so that it is the new <a href="#current4">current node</a>.
</p><p>The steps below may also require that the UA insert an HTML element in a
particular place, in which case the UA must <a href="#create">create an
element for the token</a> and then insert or append the new node in the
location specified. (This happens in particular during the parsing of
tables with invalid content.)
</p><p>The interface appropriate for an element that is not defined in this
specification is <code><a href="section-elements.html#htmlelement">HTMLElement</a></code>.
</p><h6 id="closing"><span class="secno">8.2.4.3.4. </span>Closing elements that
have implied end tags</h6>
<p>When the steps below require the UA to <dfn id="generate">generate implied
end tags</dfn>, then, if the <a href="#current4">current node</a> is a
<code><a href="section-lists0.html#dd">dd</a></code> element, a <code><a href="section-lists0.html#dt">dt</a></code> element, an <code><a href="section-lists0.html#li">li</a></code>
element, a <code><a href="section-prose.html#p">p</a></code> element, a <code><a href="section-tabular.html#td">td</a></code> element, a <code><a href="section-tabular.html#th">th</a></code>
element, or a <code><a href="section-tabular.html#tr">tr</a></code> element, the UA must act
as if an end tag with the respective tag name had been seen and then <a href="#generate">generate implied end tags</a> again.
</p><p>The step that requires the UA to generate implied end tags but lists an
element to exclude from the process, then the UA must perform the above
steps as if that element was not in the above list.
</p><h6 id="the-element"><span class="secno">8.2.4.3.5. </span>The element pointers</h6>
<p>Initially the <dfn id="head-element"><code title="">head</code> element
pointer</dfn> and the <dfn id="form-element"><code title="">form</code>
element pointer</dfn> are both null.
</p><p>Once a <code><a href="section-document.html#head">head</a></code> element has been parsed
(whether implicitly or explicitly) the <a href="#head-element"><code title="">head</code> element pointer</a> gets set to point to this node.
</p><p>The <a href="#form-element"><code title="">form</code> element
pointer</a> points to the last <code>form</code> element that was opened
and whose end tag has not yet been seen. It is used to make form controls
associate with forms in the face of dramatically bad markup, for
historical reasons.
</p><h6 id="the-insertion"><span class="secno">8.2.4.3.6. </span>The insertion mode</h6>
<p>Initially the <dfn id="insertion0">insertion mode</dfn> is "<a href="#before2" title="insertion mode: before head">before head</a>". It
can change to "<a href="#in-head" title="insertion mode: in head">in
head</a>", "<a href="#after1" title="insertion mode: after head">after
head</a>", "<a href="#in-body" title="insertion mode: in body">in
body</a>", "<a href="#in-table" title="insertion mode: in table">in
table</a>", "<a href="#in-caption" title="insertion mode: in caption">in
caption</a>", "<a href="#in-column" title="insertion mode: in column
group">in column group</a>", "<a href="#in-table0" title="insertion mode:
in table body">in table body</a>", "<a href="#in-row" title="insertion
mode: in row">in row</a>", "<a href="#in-cell" title="insertion mode: in
cell">in cell</a>", "<a href="#in-select" title="insertion mode: in
select">in select</a>", "<a href="#after2" title="insertion mode: after
body">after body</a>", "<a href="#in-frameset" title="insertion mode: in
frameset">in frameset</a>", and "<a href="#after3" title="insertion mode:
after frameset">after frameset</a>" during the course of the parsing, as
described below. It affects how certain tokens are processed.
</p><p>If the tree construction stage is switched from <a href="#the-main0">the
main phase</a> to <a href="#the-trailing0">the trailing end phase</a> and
back again, the various pieces of state are not reset; the UA must act as
if the state was maintained.
</p><p>When the steps below require the UA to <dfn id="reset">reset the insertion
mode appropriately</dfn>, it means the UA must follow these steps:
</p><ol>
<li>Let <var title="">last</var> be false.
</li><li>Let <var title="">node</var> be the last node in the <a href="#stack">stack of open elements</a>.
</li><li>If <var title="">node</var> is the first node in the stack of open
elements, then set <var title="">last</var> to true. If the element whose
<code title="dom-innerHTML-HTML"><a href="section-dynamic.html#innerhtml0">innerHTML</a></code>
attribute is being set is neither a <code><a href="section-tabular.html#td">td</a></code>
element nor a <code><a href="section-tabular.html#th">th</a></code> element, then set <var title="">node</var> to the element whose <code title="dom-innerHTML-HTML"><a href="section-dynamic.html#innerhtml0">innerHTML</a></code>
attribute is being set. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code>
case</a>)
</li><li>If <var title="">node</var> is a <code>select</code> element, then
switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-select" title="insertion mode: in select">in select</a>" and
abort these steps. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code>
case</a>)
</li><li>If <var title="">node</var> is a <code><a href="section-tabular.html#td">td</a></code> or
<code><a href="section-tabular.html#th">th</a></code> element, then switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-cell" title="insertion mode: in cell">in cell</a>" and abort these steps.
</li><li>If <var title="">node</var> is a <code><a href="section-tabular.html#tr">tr</a></code>
element, then switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-row" title="insertion mode: in row">in row</a>" and abort these
steps.
</li><li>If <var title="">node</var> is a <code><a href="section-tabular.html#tbody">tbody</a></code>, <code><a href="section-tabular.html#thead0">thead</a></code>,
or <code><a href="section-tabular.html#tfoot0">tfoot</a></code> element, then switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-table0" title="insertion mode: in table body">in table body</a>" and abort these
steps.
</li><li>If <var title="">node</var> is a <code><a href="section-tabular.html#caption0">caption</a></code> element, then switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-caption" title="insertion mode: in caption">in caption</a>" and abort these steps.
</li><li>If <var title="">node</var> is a <code><a href="section-tabular.html#colgroup">colgroup</a></code> element, then switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-column" title="insertion mode: in column group">in column group</a>" and abort
these steps. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)
</li><li>If <var title="">node</var> is a <code><a href="section-tabular.html#table">table</a></code> element, then switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-table" title="insertion mode: in table">in table</a>" and abort these steps.
</li><li>If <var title="">node</var> is a <code><a href="section-document.html#head">head</a></code>
element, then switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-body" title="insertion mode: in body">in body</a>" ("<a href="#in-body" title="insertion mode: in body">in body</a>"! <em> not
"<a href="#in-head" title="insertion mode: in head">in head</a>"</em>!)
and abort these steps. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code>
case</a>)
</li><li>If <var title="">node</var> is a <code><a href="section-sections.html#body0">body</a></code> element, then switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-body" title="insertion mode: in body">in body</a>" and abort these steps.
</li><li>If <var title="">node</var> is a <code>frameset</code> element, then
switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-frameset" title="insertion mode: in frameset">in frameset</a>"
and abort these steps. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code>
case</a>)
</li><li>If <var title="">node</var> is an <code><a href="section-the-root.html#html">html</a></code> element, then: if the <a href="#head-element"><code title="">head</code> element pointer</a> is
null, switch the <a href="#insertion0">insertion mode</a> to "<a href="#before2" title="insertion mode: before head">before head</a>",
otherwise, switch the <a href="#insertion0">insertion mode</a> to "<a href="#after1" title="insertion mode: after head">after head</a>". In
either case, abort these steps. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</li>
<!-- XXX can the head element pointer ever be
non-null when we're going through these steps? -->
<li>If <var title="">last</var> is true, then set the <a href="#insertion0">insertion mode</a> to "<a href="#in-body" title="insertion mode: in body">in body</a>" and abort these steps. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)
</li><li>Let <var title="">node</var> now be the node before <var title="">node</var> in the <a href="#stack">stack of open elements</a>.
</li><li>Return to step 3.
</li></ol>
<!--When you don't have to handle innerHTML, you can use this
simplified explanation instead:
<ol>
<li><p>If the <span>stack of open elements</span> <span title="has
an element in table scope">has a <code>td</code> or <code>th</code>
element in table scope</span>, then switch the <span>insertion
mode</span> to "<span title="insertion mode: in cell">in
cell</span>".</p></li>
<li><p>Otherwise, if the <span>stack of open elements</span> <span
title="has an element in table scope">has a <code>tr</code> element
in table scope</span>, then switch the <span>insertion mode</span>
to "<span title="insertion mode: in row">in row</span>".</p></li>
<li><p>Otherwise, if the <span>stack of open elements</span> <span
title="has an element in table scope">has a <code>tbody</code>,
<code>tfoot</code>, or <code>thead</code> element in table
scope</span>, then switch the <span>insertion mode</span> to "<span
title="insertion mode: in table body">in table
body</span>".</p></li>
<li><p>Otherwise, if the <span>stack of open elements</span> <span
title="has an element in table scope">has a <code>caption</code>
element in table scope</span>, then switch the <span>insertion
mode</span> to "<span title="insertion mode: in caption">in
caption</span>".</p></li>
( you can't reach this point with a colgroup element on the
stack )
<li><p>Otherwise, if the <span>stack of open elements</span> <span
title="has an element in table scope">has a <code>table</code>
element in table scope</span>, then switch the <span>insertion
mode</span> to "<span title="insertion mode: in table">in
table</span>".</p></li>
<li><p>Otherwise, switch the <span>insertion mode</span> to "<span
title="insertion mode: in body">in body</span>".</p></li>
</ol>
-->
<h6 id="how-to0"><span class="secno">8.2.4.3.7. </span>How to handle tokens in
the main phase</h6>
<p>Tokens in the main phase must be handled as follows:
</p><dl class="switch">
<dt>A DOCTYPE token
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd><dt>A start tag token with the tag name "html"
</dt><dd>
<p>If this start tag token was not the first start tag token, then it is
a <a href="section-parsing.html#parse">parse error</a>.</p>
<p>For each attribute on the token, check to see if the attribute is
already present on the top element of the <a href="#stack">stack of open
elements</a>. If it is not, add the attribute and its corresponding
value to that element.</p>
</dd><dt>An end-of-file token
</dt><dd>
<p><a href="#generate">Generate implied end tags.</a></p>
<p>If there are more than two nodes on the <a href="#stack">stack of open
elements</a>, or if there are two nodes but the second node is not a
<code><a href="section-sections.html#body0">body</a></code> node, this is a <a href="section-parsing.html#parse">parse error</a>.</p>
<p>Otherwise, if the parser was originally created in order to handle the
setting of an element's <code title="dom-innerHTML-HTML"><a href="section-dynamic.html#innerhtml0">innerHTML</a></code> attribute, and there's more than
one element in the <a href="#stack">stack of open elements</a>, and the
second node on the <a href="#stack">stack of open elements</a> is not a
<code><a href="section-sections.html#body0">body</a></code> node, then this is a <a href="section-parsing.html#parse">parse error</a>. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</p>
<p><a href="#stops">Stop parsing.</a></p>
<p class="big-issue">This fails because it doesn't imply HEAD and BODY
tags. We should probably expand out the insertion modes and merge them
with phases and then put the three things here into each insertion mode
instead of trying to factor them out so carefully.</p>
</dd><dt>Anything else
</dt><dd>
<p>Depends on the <a href="#insertion0">insertion mode</a>:</p>
<dl class="switch">
<dt>If the <a href="#insertion0">insertion mode</a> is "<dfn id="before2" title="insertion mode: before head">before head</dfn>"
</dt><dd>
<p>Handle the token as follows:</p>
<dl class="switch">
<dt>A character token that is one of one of U+0009 CHARACTER
TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C
FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dd>
<p><a href="#append" title="append a character">Append the
character</a> to the <a href="#current4">current node</a>.</p>
</dd><dt>A comment token
</dt><dd>
<p>Append a <code>Comment</code> node to the <a href="#current4">current node</a> with the <code title="">data</code> attribute set to the data given in the comment
token.</p>
</dd><dt>A start tag token with the tag name "head"
</dt><dd>
<p><a href="#create">Create an element for the token</a>.</p>
<p>Set the <a href="#head-element"><code title="">head</code> element
pointer</a> to this new element node.</p>
<p>Append the new element to the <a href="#current4">current node</a>
and push it onto the <a href="#stack">stack of open elements</a>.</p>
<p>Change the <a href="#insertion0">insertion mode</a> to "<a href="#in-head" title="insertion mode: in head">in head</a>".</p>
</dd><dt>A start tag token whose tag name is one of: "base", "link",
"meta", "script", "style", "title"
</dt><dd>
<p>Act as if a start tag token with the tag name "head" and no
attributes had been seen, then reprocess the current token.</p>
<p class="note">This will result in a <code><a href="section-document.html#head">head</a></code> element being generated, and with the
current token being reprocessed in the "<a href="#in-head" title="insertion mode: in head">in head</a>" <a href="#insertion0">insertion mode</a>.</p>
</dd><dt>An end tag with the tag name "html"
</dt><dd>
<p>Act as if a start tag token with the tag name "head" and no
attributes had been seen, then reprocess the current token.</p>
</dd><dt>Any other end tag
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd><dt>A character token that is <em>not</em> one of U+0009 CHARACTER
TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C
FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dt>Any other start tag token
</dt><dd>
<p>Act as if a start tag token with the tag name "head" and no
attributes had been seen, then reprocess the current token.</p>
<p class="note">This will result in an empty <code><a href="section-document.html#head">head</a></code> element being generated, with the
current token being reprocessed in the "<a href="#after1" title="insertion mode: after head">after head</a>" <a href="#insertion0">insertion mode</a>.</p>
</dd></dl>
</dd><dt id="parsing-main-inhead">If the <a href="#insertion0">insertion
mode</a> is "<dfn id="in-head" title="insertion mode: in head">in
head</dfn>"
</dt><dd>
<p>Handle the token as follows.</p>
<p class="note">The rules for handling "title", "style", and "script"
start tags are similar, but not identical.</p>
<p class="note">It is possible for the <a href="#tree-construction0">tree
construction</a> stage's <a href="#the-main0" title="the main
phase">main phase</a> to be in the "<a href="#in-head" title="insertion mode: in head">in head</a>" <a href="#insertion0">insertion mode</a> without the <a href="#current4">current node</a> being a <code><a href="section-document.html#head">head</a></code> element, e.g. if a <code><a href="section-document.html#head">head</a></code> end tag is immediately followed by a
<code><a href="section-document.html#meta0">meta</a></code> start tag.</p>
<dl class="switch">
<dt>A character token that is one of one of U+0009 CHARACTER
TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C
FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dd>
<p><a href="#append" title="append a character">Append the
character</a> to the <a href="#current4">current node</a>.</p>
</dd><dt>A comment token
</dt><dd>
<p>Append a <code>Comment</code> node to the <a href="#current4">current node</a> with the <code title="">data</code> attribute set to the data given in the comment
token.</p>
</dd><dt>A start tag with the tag name "title"
</dt><dd>
<p><a href="#create">Create an element for the token</a>.</p>
<p>Append the new element to the node pointed to by the <a href="#head-element"><code title="">head</code> element pointer</a>,
or, if that is null (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code>
case</a>), to the <a href="#current4">current node</a>.</p>
<p>Switch the tokeniser's <a href="section-tokenisation.html#content2">content model flag</a>
to the RCDATA state.</p>
<p>Then, collect all the character tokens that the tokeniser returns
until it returns a token that is not a character token.</p>
<p>If this process resulted in a collection of character tokens,
append a single <code>Text</code> node to the <code><a href="section-document.html#title1">title</a></code> element node whose contents is the
concatenation of all those tokens' characters.</p>
<p>The tokeniser's <a href="section-tokenisation.html#content2">content model flag</a> will
have switched back to the PCDATA state.</p>
<p>If the next token is an end tag token with the tag name "title",
ignore it. Otherwise, this is a <a href="section-parsing.html#parse">parse error</a>.</p>
</dd><dt>A start tag with the tag name "style"
</dt><dd>
<p><a href="#create">Create an element for the token</a>.</p>
<p>Append the new element to the <a href="#current4">current
node</a>, unless the <a href="#insertion0">insertion mode</a> is "<a href="#in-head" title="insertion mode: in head">in head</a>" and the
<a href="#head-element"><code title="">head</code> element
pointer</a> is not null, in which case append it to the node pointed
to by the <a href="#head-element"><code title="">head</code> element
pointer</a>. <!--
<head></head><style><body> should put the style block in the
head, and does so by switching back to in head, but the head
isn't the current node at that point (comments should go
between the head and the body) -->.</p>
<p>Switch the tokeniser's <a href="section-tokenisation.html#content2">content model flag</a>
to the CDATA state.</p>
<p>Then, collect all the character tokens that the tokeniser returns
until it returns a token that is not a character token, or until it
stops tokenising.</p>
<p>If this process resulted in a collection of character tokens,
append a single <code>Text</code> node to the <code><a href="section-document.html#style">style</a></code> element node whose contents is the
concatenation of all those tokens' characters.</p>
<p>The tokeniser's <a href="section-tokenisation.html#content2">content model flag</a> will
have switched back to the PCDATA state.</p>
<p>If the next token is an end tag token with the tag name "style",
ignore it. Otherwise, this is a <a href="section-parsing.html#parse">parse error</a>.</p>
</dd><dt id="scriptTag">A start tag with the tag name "script"
</dt><dd>
<p><a href="#create">Create an element for the token</a>.</p>
<p>Mark the element as being <a href="section-scripting0.html#parser-inserted">"parser-inserted"</a>. This ensures that, if
the script is external, any <code title="dom-document-write-HTML"><a href="section-dynamic.html#document.write0">document.write()</a></code> calls in the
script will execute in-line, instead of blowing the document away,
as would happen in most other cases.</p>
<p>Switch the tokeniser's <a href="section-tokenisation.html#content2">content model flag</a>
to the CDATA state.</p>
<p>Then, collect all the character tokens that the tokeniser returns
until it returns a token that is not a character token, or until it
stops tokenising.</p>
<p>If this process resulted in a collection of character tokens,
append a single <code>Text</code> node to the <code><a href="section-scripting0.html#script0">script</a></code> element node whose contents is the
concatenation of all those tokens' characters.</p>
<p>The tokeniser's <a href="section-tokenisation.html#content2">content model flag</a> will
have switched back to the PCDATA state.</p>
<p>If the next token is not an end tag token with the tag name
"script", then this is a <a href="section-parsing.html#parse">parse error</a>; mark the
<code><a href="section-scripting0.html#script0">script</a></code> element as <a href="section-scripting0.html#already">"already executed"</a>. Otherwise, the token is the
<code><a href="section-scripting0.html#script0">script</a></code> element's end tag, so
ignore it.</p>
<p>If the parser was originally created in order to handle the
setting of a node's <code title="dom-innerHTML-HTML"><a href="section-dynamic.html#innerhtml0">innerHTML</a></code> attribute, then mark the
<code><a href="section-scripting0.html#script0">script</a></code> element as <a href="section-scripting0.html#already">"already executed"</a>, and skip the rest of the
processing described for this token (including the part below where
"<a href="section-scripting0.html#the-script" title="the script that will execute as soon
as the parser resumes">scripts that will execute as soon as the
parser resumes</a>" are executed). (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</p>
<p class="note">Marking the <code><a href="section-scripting0.html#script0">script</a></code>
element as "already executed" prevents it from executing when it is
inserted into the document a few paragraphs below. Scripts missing
their end tags and scripts that were inserted using <code title="dom-innerHTML-HTML"><a href="section-dynamic.html#innerhtml0">innerHTML</a></code>
aren't executed.</p>
<p>Let the <var title="">old insertion point</var> have the same
value as the current <a href="section-parsing.html#insertion">insertion point</a>. Let
the <a href="section-parsing.html#insertion">insertion point</a> be just before the <a href="section-parsing.html#next-input">next input character</a>.</p>
<p>Append the new element to the <a href="#current4">current
node</a>, unless the <a href="#insertion0">insertion mode</a> is "<a href="#in-head" title="insertion mode: in head">in head</a>" and the
<a href="#head-element"><code title="">head</code> element
pointer</a> is not null, in which case append it to the node pointed
to by the <a href="#head-element"><code title="">head</code> element
pointer</a>. <!--
<head></head><script><body> should put the script in the head,
and does so by switching back to in head, but the head isn't
the current node at that point (comments should go between the
head and the body) -->
<a href="section-scripting0.html#running0" title="running a script">Special processing
occurs when a <code>script</code> element is inserted into a
document</a> that might cause some script to execute, which might
cause <a href="section-dynamic.html#document.write0" title="dom-document-write-HTML">new
characters to be inserted into the tokeniser</a>.</p>
<p>Let the <a href="section-parsing.html#insertion">insertion point</a> have the value of
the <var title="">old insertion point</var>. (In other words,
restore the <a href="section-parsing.html#insertion">insertion point</a> to the value it
had before the previous paragraph. This value might be the
"undefined" value.)</p>
<p id="scriptTagParserResumes">At this stage, if there is <a href="section-scripting0.html#the-script" title="the script that will execute as soon as
the parser resumes">a script that will execute as soon as the parser
resumes</a>, then:</p>
<dl class="switch">
<dt>If the tree construction stage is <a href="section-parsing.html#nestedParsing">being
called reentrantly</a>, say from a call to <code title="dom-document-write-HTML"><a href="section-dynamic.html#document.write0">document.write()</a></code>:
</dt><dd>
<p>Abort the processing of any nested invokations of the tokeniser,
yielding control back to the caller. (Tokenisation will resume
when the caller returns to the "outer" tree construction stage.)
</p></dd><dt>Otherwise:
</dt><dd>
<p>Follow these steps:</p>
<ol>
<li>
<p>Let <var title="">the script</var> be <a href="section-scripting0.html#the-script">the script that will execute as soon as the
parser resumes</a>. There is no longer <a href="section-scripting0.html#the-script" title="the script that will execute as soon as the parser
resumes">a script that will execute as soon as the parser
resumes</a>.
</p></li><li>
<p><a href="section-terminology.html#pause">Pause</a> until the script has
<span>completed loading</span><!-- XXX xref -->.
</p></li><li>
<p>Let the <a href="section-parsing.html#insertion">insertion point</a> be just
before the <a href="section-parsing.html#next-input">next input character</a>.
</p></li><li>
<p><a href="section-scripting0.html#executing0" title="executing a script block">Execute
the script</a>.
</p></li><li>
<p>Let the <a href="section-parsing.html#insertion">insertion point</a> be undefined
again.
</p></li><li>
<p>If there is once again <a href="section-scripting0.html#the-script" title="the script
that will execute as soon as the parser resumes">a script that
will execute as soon as the parser resumes</a>, then repeat
these steps from step 1.
</p></li></ol>
</dd></dl>
</dd><dt>A start tag with the tag name "base", "link", or "meta"
</dt><dd>
<p><a href="#create">Create an element for the token</a>.</p>
<p>Append the new element to the node pointed to by the <a href="#head-element"><code title="">head</code> element pointer</a>,
or, if that is null (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code>
case</a>), to the <a href="#current4">current node</a>.</p>
</dd><dt>An end tag with the tag name "head"
</dt><dd>
<p>If the <a href="#current4">current node</a> is a <code><a href="section-document.html#head">head</a></code> element, pop the <a href="#current4">current node</a> off the <a href="#stack">stack of
open elements</a>. Otherwise, this is a <a href="section-parsing.html#parse">parse
error</a>.</p>
<!-- might happen if you see two </head>s
and something in between the two sends you from "after head"
back to "in head" -->
<p>Change the <a href="#insertion0">insertion mode</a> to "<a href="#after1" title="insertion mode: after head">after head</a>".</p>
</dd><dt>An end tag with the tag name "html"
</dt><dd>
<p>Act as described in the "anything else" entry below.</p>
</dd><dt>A start tag with the tag name "head"
</dt><dt>Any other end tag
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd><dt>Anything else
</dt><dd>
<p>If the <a href="#current4">current node</a> is a <code><a href="section-document.html#head">head</a></code> element, act as if an end tag token
with the tag name "head" had been seen.</p>
<p>Otherwise, change the <a href="#insertion0">insertion mode</a> to
"<a href="#after1" title="insertion mode: after head">after
head</a>".</p>
<p>Then, reprocess the current token.</p>
<p class="big-issue">In certain UAs, <a href="https://bugzilla.mozilla.org/attachment.cgi?id=180157&action=view">some
elements</a> don't trigger the "in body" mode straight away, but
instead get put into the head. Do we want to copy that?</p>
</dd></dl>
</dd><dt>If the <a href="#insertion0">insertion mode</a> is "<dfn id="after1" title="insertion mode: after head">after head</dfn>"
</dt><dd>
<p>Handle the token as follows:</p>
<dl class="switch">
<dt>A character token that is one of one of U+0009 CHARACTER
TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C
FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dd>
<p><a href="#append" title="append a character">Append the
character</a> to the <a href="#current4">current node</a>.</p>
</dd><dt>A comment token
</dt><dd>
<p>Append a <code>Comment</code> node to the <a href="#current4">current node</a> with the <code title="">data</code> attribute set to the data given in the comment
token.</p>
</dd><dt>A start tag token with the tag name "body"
</dt><dd>
<p><a href="#insert" title="insert an HTML element">Insert a
<code>body</code> element</a> for the token.</p>
<p>Change the <a href="#insertion0">insertion mode</a> to "<a href="#in-body" title="insertion mode: in body">in body</a>".</p>
</dd><dt>A start tag token with the tag name "frameset"
</dt><dd>
<p><a href="#insert" title="insert an HTML element">Insert a
<code>frameset</code> element</a> for the token.</p>
<p>Change the <a href="#insertion0">insertion mode</a> to "<a href="#in-frameset" title="insertion mode: in frameset">in
frameset</a>".</p>
</dd><dt>A start tag token whose tag name is one of: "base", "link",
"meta", "script", "style", "title"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Switch the <a href="#insertion0">insertion mode</a> back to "<a href="#in-head" title="insertion mode: in head">in head</a>" and reprocess the
token.</p>
</dd><dt>Anything else
</dt><dd>
<p>Act as if a start tag token with the tag name "body" and no
attributes had been seen, and then reprocess the current token.</p>
</dd></dl>
</dd><dt id="parsing-main-inbody">If the <a href="#insertion0">insertion
mode</a> is "<dfn id="in-body" title="insertion mode: in body">in
body</dfn>"
</dt><dd>
<p>Handle the token as follows:</p>
<dl class="switch">
<dt>A character token
</dt><dd>
<p><a href="#reconstruct">Reconstruct the active formatting
elements</a>, if any.</p>
<p><a href="#append" title="append a character">Append the token's
character</a> to the <a href="#current4">current node</a>.</p>
</dd><dt>A comment token
</dt><dd>
<p>Append a <code>Comment</code> node to the <a href="#current4">current node</a> with the <code title="">data</code> attribute set to the data given in the comment
token.</p>
</dd><dt>A start tag token whose tag name is one of: "script", "style"
</dt><dd>
<p>Process the token as if the <a href="#insertion0">insertion
mode</a> had been "<a href="#in-head" title="insertion mode: in
head">in head</a>".</p>
</dd><dt>A start tag token whose tag name is one of: "base", "link",
"meta", "title"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Process the token as if the <a href="#insertion0">insertion mode</a> had been "<a href="#in-head" title="insertion mode: in head">in head</a>".</p>
</dd><dt>A start tag token with the tag name "body"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>.</p>
<p>If the second element on the <a href="#stack">stack of open
elements</a> is not a <code><a href="section-sections.html#body0">body</a></code>
element, or, if the <a href="#stack">stack of open elements</a> has
only one node on it, then ignore the token. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</p>
<p>Otherwise, for each attribute on the token, check to see if the
attribute is already present on the <code><a href="section-sections.html#body0">body</a></code> element (the second element) on the <a href="#stack">stack of open elements</a>. If it is not, add the
attribute and its corresponding value to that element.</p>
</dd><dt>An end tag with the tag name "body"
</dt><dd>
<p>If the second element in the <a href="#stack">stack of open
elements</a> is not a <code><a href="section-sections.html#body0">body</a></code>
element, this is a <a href="section-parsing.html#parse">parse error</a>. Ignore the
token. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</p>
<p>Otherwise:</p>
<p class="big-issue">this needs to handle closing of implied elements,
but without closing them</p>
<p>If the <a href="#current4">current node</a> is not the <code><a href="section-sections.html#body0">body</a></code> element, then this is a <a href="section-parsing.html#parse">parse error</a>.</p>
<p>Change the <a href="#insertion0">insertion mode</a> to "<a href="#after2" title="insertion mode: after body">after body</a>".</p>
</dd><dt>An end tag with the tag name "html"
</dt><dd>
<p>Act as if an end tag with tag name "body" had been seen, then, if
that token wasn't ignored, reprocess the current token.</p>
<p class="note">The fake end tag token here can only be ignored in the
<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>.</p>
</dd><dt>A start tag whose tag name is one of: "address", "blockquote",
"center", "dir", "div", "dl", "fieldset", "listing", "menu", "ol",
"p", "ul"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has a <code>p</code>
element in scope</a>, then act as if an end tag with the tag name
<code><a href="section-prose.html#p">p</a></code> had been seen.</p>
<p><a href="#insert" title="insert an html element">Insert an HTML
element</a> for the token.</p>
</dd><dt>A start tag whose tag name is "pre"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has a <code>p</code>
element in scope</a>, then act as if an end tag with the tag name
<code><a href="section-prose.html#p">p</a></code> had been seen.</p>
<p><a href="#insert" title="insert an html element">Insert an HTML
element</a> for the token.</p>
<p>If the next token is a U+000A LINE FEED (LF) character token, then
ignore that token and move on to the next one. (Newlines at the
start of <code><a href="section-preformatted.html#pre">pre</a></code> blocks are ignored as
an authoring convenience.)</p>
</dd><dt>A start tag whose tag name is "form"
</dt><dd>
<p>If the <a href="#form-element"><code title="form">form</code>
element pointer</a> is not null, ignore the token with a <a href="section-parsing.html#parse">parse error</a>.</p>
<p>Otherwise:</p>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has a <code>p</code>
element in scope</a>, then act as if an end tag with the tag name
<code><a href="section-prose.html#p">p</a></code> had been seen.</p>
<p><a href="#insert" title="insert an html Element">Insert an HTML
element</a> for the token, and set the <code title="form">form</code>
element pointer to point to the element created.</p>
</dd><dt>A start tag whose tag name is "li"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has a <code>p</code>
element in scope</a>, then act as if an end tag with the tag name
<code><a href="section-prose.html#p">p</a></code> had been seen.</p>
<p>Run the following algorithm:</p>
<ol>
<li>
<p>Initialise <var title="">node</var> to be the <a href="#current4">current node</a> (the bottommost node of the
stack).
</p></li><li>
<p>If <var title="">node</var> is an <code><a href="section-lists0.html#li">li</a></code> element, then pop all the nodes from the
<a href="#current4">current node</a> up to <var title="">node</var>, including <var title="">node</var>, then stop
this algorithm. If more than one node is popped, then this is a <a href="section-parsing.html#parse">parse error</a>.
</p></li><li>
<p>If <var title="">node</var> is not in the <a href="#formatting">formatting</a> category, and is not in the <a href="#phrasing">phrasing</a> category, and is not an <code><a href="section-sections.html#address">address</a></code> or <code><a href="section-miscellaneous.html#div">div</a></code> element, then stop this algorithm.
</p></li>
<!-- an element <foo> is in this
list if the following markup:
<!DOCTYPE html><body><ol><li><foo><li>
...results in the second <li> not being (in any way) a
descendant of the first <li>, or if <foo> is a formatting
element that gets reopened later. -->
<li>
<p>Otherwise, set <var title="">node</var> to the previous entry in
the <a href="#stack">stack of open elements</a> and return to step
2.
</p></li></ol>
<p>Finally, <a href="#insert" title="insert an html element">insert
an <code>li</code> element</a>.</p>
</dd><dt>A start tag whose tag name is "dd" or "dt"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has a <code>p</code>
element in scope</a>, then act as if an end tag with the tag name
<code><a href="section-prose.html#p">p</a></code> had been seen.</p>
<p>Run the following algorithm:</p>
<ol>
<li>
<p>Initialise <var title="">node</var> to be the <a href="#current4">current node</a> (the bottommost node of the
stack).
</p></li><li>
<p>If <var title="">node</var> is a <code><a href="section-lists0.html#dd">dd</a></code> or <code><a href="section-lists0.html#dt">dt</a></code>
element, then pop all the nodes from the <a href="#current4">current node</a> up to <var title="">node</var>,
including <var title="">node</var>, then stop this algorithm. If
more than one node is popped, then this is a <a href="section-parsing.html#parse">parse error</a>.
</p></li><li>
<p>If <var title="">node</var> is not in the <a href="#formatting">formatting</a> category, and is not in the <a href="#phrasing">phrasing</a> category, and is not an <code><a href="section-sections.html#address">address</a></code> or <code><a href="section-miscellaneous.html#div">div</a></code> element, then stop this algorithm.
</p></li>
<!-- an element <foo> is in this
list if the following markup:
<!DOCTYPE html><body><ol><dt><foo><dt>
...results in the second <li> not being (in any way) a
descendant of the first <li>, or if <foo> is a formatting
element that gets reopened later. -->
<li>
<p>Otherwise, set <var title="">node</var> to the previous entry in
the <a href="#stack">stack of open elements</a> and return to step
2.
</p></li></ol>
<p>Finally, <a href="#insert" title="insert an html element">insert
an HTML element</a> with the same tag name as the token's.</p>
</dd><dt>A start tag token whose tag name is "plaintext"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has a <code>p</code>
element in scope</a>, then act as if an end tag with the tag name
<code><a href="section-prose.html#p">p</a></code> had been seen.</p>
<p><a href="#insert" title="insert an html element">Insert an HTML
element</a> for the token.</p>
<p>Switch the <a href="section-tokenisation.html#content2">content model flag</a> to the
PLAINTEXT state.</p>
<p class="note">Once a start tag with the tag name "plaintext" has been
seen, that will be the last token ever seen other than character
tokens (and the end-of-file token), because there is no way to
switch the <a href="section-tokenisation.html#content2">content model flag</a> out of the
PLAINTEXT state.</p>
</dd><dt>An end tag whose tag name is one of: "address", "blockquote",
"center", "dir", "div", "dl", "fieldset", "listing", "menu", "ol",
"pre", "ul"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an">has an element in scope</a> with the same tag name
as that of the token, then <a href="#generate">generate implied end
tags</a>.</p>
<p>Now, if the <a href="#current4">current node</a> is not an element
with the same tag name as that of the token, then this is a <a href="section-parsing.html#parse">parse error</a>.</p>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an">has an element in scope</a> with the same tag name
as that of the token, then pop elements from this stack until an
element with that tag name has been popped from the stack.</p>
<!-- XXX quirk (except for in certain cases?):
<p>Otherwise, act as if a start tag with the tag name given in
the token had been seen, then reprocess the current token.</p>
-->
</dd><dt>An end tag whose tag name is "form"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an">has an element in scope</a> with the same tag name
as that of the token, then <a href="#generate">generate implied end
tags</a>.</p>
<p>Now, if the <a href="#current4">current node</a> is not an element
with the same tag name as that of the token, then this is a <a href="section-parsing.html#parse">parse error</a>.</p>
<p>Otherwise, if the <a href="#current4">current node</a> is an
element with the same tag name as that of the token pop that element
from the stack.</p>
<p>In any case, set the <a href="#form-element"><code title="">form</code> element pointer</a> to null.</p>
</dd><dt>An end tag whose tag name is "p"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has a <code>p</code>
element in scope</a>, then <a href="#generate">generate implied end
tags</a>, except for <code><a href="section-prose.html#p">p</a></code> elements.</p>
<p>If the <a href="#current4">current node</a> is not a <code><a href="section-prose.html#p">p</a></code> element, then this is a <a href="section-parsing.html#parse">parse error</a>.</p>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has a <code>p</code>
element in scope</a>, then pop elements from this stack until the
stack no longer <a href="#have-an" title="has an element in
scope">has a <code>p</code> element in scope</a>.</p>
<!-- XXX quirk:
<p>Otherwise, act as if a start tag with the tag name
<code>p</code> had been seen, then reprocess the current
token.</p>
-->
</dd><dt>An end tag whose tag name is "dd", "dt", or "li"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an">has an element in scope</a> whose tag name matches
the tag name of the token, then <a href="#generate">generate implied
end tags</a>, except for elements with the same tag name as the
token.</p>
<p>If the <a href="#current4">current node</a> is not an element with
the same tag name as the token, then this is a <a href="section-parsing.html#parse">parse error</a>.</p>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an">has an element in scope</a> whose tag name matches
the tag name of the token, then pop elements from this stack until
an element with that tag name has been popped from the stack.</p>
</dd><dt>A start tag whose tag name is one of: "h1", "h2", "h3", "h4",
"h5", "h6"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has a <code>p</code>
element in scope</a>, then act as if an end tag with the tag name
<code><a href="section-prose.html#p">p</a></code> had been seen.</p>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has in scope</a> an
element whose tag name is one of "h1", "h2", "h3", "h4", "h5", or
"h6", then this is a <a href="section-parsing.html#parse">parse error</a>; pop elements
from the stack until an element with one of those tag names has been
popped from the stack.</p>
<p><a href="#insert" title="insert an html element">Insert an HTML
element</a> for the token.</p>
</dd><dt>An end tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5",
"h6"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has in scope</a> an
element whose tag name is one of "h1", "h2", "h3", "h4", "h5", or
"h6", then <a href="#generate">generate implied end tags</a>.</p>
<p>Now, if the <a href="#current4">current node</a> is not an element
with the same tag name as that of the token, then this is a <a href="section-parsing.html#parse">parse error</a>.</p>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has in scope</a> an
element whose tag name is one of "h1", "h2", "h3", "h4", "h5", or
"h6", then pop elements from the stack until an element with one of
those tag names has been popped from the stack.</p>
<!-- XXX quirk:
<p>Otherwise, act as if a start tag with the tag name given in
the token had been seen, then reprocess the current token.</p>
-->
</dd>
<!-- ADOPTION AGENCY ELEMENTS
Mozilla-only: bdo blink del ins sub sup q
Safari-only: code dfn kbd nobr samp var wbr
Both: a b big em font i s small strike strong tt u -->
<dt>A start tag whose tag name is "a"
</dt><dd>
<p>If the <a href="#list-of4">list of active formatting elements</a>
contains an element whose tag name is "a" between the end of the
list and the last marker on the list (or the start of the list if
there is no marker on the list), then this is a <a href="section-parsing.html#parse">parse error</a>; act as if an end tag with the tag
name "a" had been seen, then remove that element from the <a href="#list-of4">list of active formatting elements</a> and the <a href="#stack">stack of open elements</a> if the end tag didn't
already remove it (it might not have if the element is not <a href="#have-an0" title="has an element in table scope">in table
scope</a>).</p>
<p class="example">In the non-conforming stream
<code><a href="a">a<table><a href="b">b</table>x</code>,
the first <code><a href="section-phrase.html#a">a</a></code> element would be closed
upon seeing the second one, and the "x" character would be inside a
link to "b", not to "a". This is despite the fact that the outer
<code><a href="section-phrase.html#a">a</a></code> element is not in table scope
(meaning that a regular <code></a></code> end tag at the start of
the table wouldn't close the outer <code><a href="section-phrase.html#a">a</a></code>
element).</p>
<p><a href="#reconstruct">Reconstruct the active formatting
elements</a>, if any.</p>
<p><a href="#insert" title="insert an html element">Insert an HTML
element</a> for the token. Add that element to the <a href="#list-of4">list of active formatting elements</a>.</p>
</dd><dt>A start tag whose tag name is one of: "b", "big", "em", "font",
"i", "nobr", "s", "small", "strike", "strong", "tt", "u"
</dt><dd>
<p><a href="#reconstruct">Reconstruct the active formatting
elements</a>, if any.</p>
<p><a href="#insert" title="insert an html element">Insert an HTML
element</a> for the token. Add that element to the <a href="#list-of4">list of active formatting elements</a>.</p>
</dd><dt id="adoptionAgency">An end tag whose tag name is one of: "a", "b",
"big", "em", "font", "i", "nobr", "s", "small", "strike", "strong",
"tt", "u"
</dt><dd>
<p>Follow these steps:</p>
<ol>
<li>
<p>Let the <var title="">formatting element</var> be the last
element in the <a href="#list-of4">list of active formatting
elements</a> that:</p>
<ul>
<li>is between the end of the list and the last scope marker in
the list, if any, or the start of the list otherwise, and
</li><li>has the same tag name as the token.
</li></ul>
<p>If there is no such node, or, if that node is also in the <a href="#stack">stack of open elements</a> but the element is not <a href="#have-an" title="has an element in scope">in scope</a>, then
this is a <a href="section-parsing.html#parse">parse error</a>. Abort these steps. The
token is ignored.</p>
<p>Otherwise, if there is such a node, but that node is not in the
<a href="#stack">stack of open elements</a>, then this is a <a href="section-parsing.html#parse">parse error</a>; remove the element from the list,
and abort these steps.</p>
<p>Otherwise, there is a <var title="">formatting element</var> and
that element is in <a href="#stack" title="stack of open
elements">the stack</a> and is <a href="#have-an" title="has an
element in scope">in scope</a>. If the element is not the <a href="#current4">current node</a>, this is a <a href="section-parsing.html#parse">parse error</a>. In any case, proceed with the
algorithm as written in the following steps.</p>
</li><li>
<p>Let the <var title="">furthest block</var> be the topmost node
in the <a href="#stack">stack of open elements</a> that is lower
in the stack than the <var title="">formatting element</var>, and
is not an element in the <a href="#phrasing">phrasing</a> or <a href="#formatting">formatting</a> categories. There might not be
one.
</p></li><li>
<p>If there is no <var title="">furthest block</var>, then the UA
must skip the subsequent steps and instead just pop all the nodes
from the bottom of the <a href="#stack">stack of open
elements</a>, from the <a href="#current4">current node</a> up to
the <var title="">formatting element</var>, and remove the <var title="">formatting element</var> from the <a href="#list-of4">list of active formatting elements</a>.
</p></li><li>
<p>Let the <var title="">common ancestor</var> be the element
immediately above the <var title="">formatting element</var> in
the <a href="#stack">stack of open elements</a>.
</p></li><li>
<p>If the <var title="">furthest block</var> has a parent node,
then remove the <var title="">furthest block</var> from its parent
node.
</p></li><li>
<p>Let a bookmark note the position of the <var title="">formatting
element</var> in the <a href="#list-of4">list of active formatting
elements</a> relative to the elements on either side of it in the
list.
</p></li><li>
<p>Let <var title="">node</var> and <var title="">last node</var>
be the <var title="">furthest block</var>. Follow these steps:</p>
<ol>
<li>Let <var title="">node</var> be the element immediately prior
to <var title="">node</var> in the <a href="#stack">stack of open
elements</a>.
</li><li>If <var title="">node</var> is not in the <a href="#list-of4">list of active formatting elements</a>, then
remove <var title="">node</var> from the <a href="#stack">stack
of open elements</a> and then go back to step 1.
</li><li>Otherwise, if <var title="">node</var> is the <var title="">formatting element</var>, then go to the next step in
the overall algorithm.
</li><li>Otherwise, if <var title="">last node</var> is the <var title="">furthest block</var>, then move the aforementioned
bookmark to be immediately after the <var title="">node</var> in
the <a href="#list-of4">list of active formatting elements</a>.
</li><li>If <var title="">node</var> has any children, perform a
shallow clone of <var title="">node</var>, replace the entry for
<var title="">node</var> in the <a href="#list-of4">list of
active formatting elements</a> with an entry for the clone,
replace the entry for <var title="">node</var> in the <a href="#stack">stack of open elements</a> with an entry for the
clone, and let <var title="">node</var> be the clone.
</li><li>Insert <var title="">last node</var> into <var title="">node</var>, first removing it from its previous parent
node if any.
</li><li>Let <var title="">last node</var> be <var title="">node</var>.
</li><li>Return to step 1 of this inner set of steps.
</li></ol>
</li><li>
<p>Insert whatever <var title="">last node</var> ended up being in
the previous step into the <var title="">common ancestor</var>
node, first removing it from its previous parent node if any.
</p></li><li>
<p>Perform a shallow clone of the <var title="">formatting
element</var>.
</p></li><li>
<p>Take all of the child nodes of the <var title="">furthest
block</var> and append them to the clone created in the last step.
</p></li><li>
<p>Append that clone to the <var title="">furthest block</var>.
</p></li><li>
<p>Remove the <var title="">formatting element</var> from the <a href="#list-of4">list of active formatting elements</a>, and
insert the clone into the <a href="#list-of4">list of active
formatting elements</a> at the position of the aforementioned
bookmark.
</p></li><li>
<p>Remove the <var title="">formatting element</var> from the <a href="#stack">stack of open elements</a>, and insert the clone
into the <a href="#stack">stack of open elements</a> immediately
after (i.e. in a more deeply nested position than) the position of
the <var title="">furthest block</var> in that stack.
</p></li><li>
<p>Jump back to step 1 in this series of steps.
</p></li></ol>
<p class="note">The way these steps are defined, only elements in the
<a href="#formatting">formatting</a> category ever get cloned by
this algorithm.</p>
<!--XXX
<div class="example">
<p class="big-issue">Need an example.</p>
</div>
-->
<p class="note">Because of the way this algorithm causes elements to
change parents, it has been dubbed the "adoption agency algorithm"
(in contrast with other possibly algorithms for dealing with
misnested content, which included the "incest algorithm", the
"secret affair algorithm", and the "Heisenberg algorithm").</p>
</dd><dt>A start tag token whose tag name is "button"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has a
<code>button</code> element in scope</a>, then this is a <a href="section-parsing.html#parse">parse error</a>; act as if an end tag with the tag
name "button" had been seen, then reprocess the token.</p>
<p>Otherwise:</p>
<p><a href="#reconstruct">Reconstruct the active formatting
elements</a>, if any.</p>
<p><a href="#insert">Insert an HTML element</a> for the token.</p>
<p>Insert a marker at the end of the <a href="#list-of4">list of
active formatting elements</a>.</p>
</dd><dt>A start tag token whose tag name is one of: "marquee", "object"
</dt><dd>
<p><a href="#reconstruct">Reconstruct the active formatting
elements</a>, if any.</p>
<p><a href="#insert">Insert an HTML element</a> for the token.</p>
<p>Insert a marker at the end of the <a href="#list-of4">list of
active formatting elements</a>.</p>
</dd><dt>An end tag token whose tag name is one of: "button", "marquee",
"object"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has in scope</a> an
element whose tag name is the same as the tag name of the token,
then <a href="#generate">generate implied end tags</a>.</p>
<p>Now, if the <a href="#current4">current node</a> is not an element
with the same tag name as the token, then this is a <a href="section-parsing.html#parse">parse error</a>.</p>
<p>Now, if the <a href="#stack">stack of open elements</a> <a href="#have-an">has an element in scope</a> whose tag name matches
the tag name of the token, then pop elements from the stack until
that element has been popped from the stack, and <a href="#clear0">clear the list of active formatting elements up to
the last marker</a>.</p>
</dd><dt>A start tag token whose tag name is "xmp"
</dt><dd>
<p><a href="#reconstruct">Reconstruct the active formatting
elements</a>, if any.</p>
<p><a href="#insert">Insert an HTML element</a> for the token.</p>
<p>Switch the <a href="section-tokenisation.html#content2">content model flag</a> to the CDATA
state.</p>
</dd><dt>A start tag whose tag name is "table"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has a <code>p</code>
element in scope</a>, then act as if an end tag with the tag name
<code><a href="section-prose.html#p">p</a></code> had been seen.</p>
<!-- XXX quirks: don't do this -->
<p><a href="#insert">Insert an HTML element</a> for the token.</p>
<p>Change the <a href="#insertion0">insertion mode</a> to "<a href="#in-table" title="insertion mode: in table">in table</a>".</p>
</dd><dt>A start tag whose tag name is one of: "area", "basefont",
"bgsound", "br", "embed", "img", "param", "spacer", "wbr"
</dt><dd>
<p><a href="#reconstruct">Reconstruct the active formatting
elements</a>, if any.</p>
<p><a href="#insert" title="insert an html element">Insert an HTML
element</a> for the token. Immediately pop the <a href="#current4">current node</a> off the <a href="#stack">stack of
open elements</a>.</p>
</dd><dt>A start tag whose tag name is "hr"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an" title="has an element in scope">has a <code>p</code>
element in scope</a>, then act as if an end tag with the tag name
<code><a href="section-prose.html#p">p</a></code> had been seen.</p>
<!-- XXX quirks: don't do this -->
<p><a href="#insert" title="insert an html element">Insert an HTML
element</a> for the token. Immediately pop the <a href="#current4">current node</a> off the <a href="#stack">stack of
open elements</a>.</p>
</dd><dt>A start tag whose tag name is "image"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Change the token's tag name to
"img" and reprocess it. (Don't ask.)</p>
<!-- As of
2005-12, studies showed that around 0.2% of pages used the
<image> element. -->
</dd><dt>A start tag whose tag name is "input"
</dt><dd>
<p><a href="#reconstruct">Reconstruct the active formatting
elements</a>, if any.</p>
<p><a href="#insert" title="insert an html element">Insert an
<code>input</code> element</a> for the token.</p>
<p>If the <a href="#form-element"><code title="">form</code> element
pointer</a> is not null, then <span>associate</span><!--XXX
xref! -->
the <code>input</code> element with the <code>form</code> element
pointed to by the <a href="#form-element"><code title="">form</code>
element pointer</a>.</p>
<p>Pop that <code>input</code> element off the <a href="#stack">stack
of open elements</a>.</p>
</dd><dt id="isindex">A start tag whose tag name is "isindex"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>.</p>
<p>If the <a href="#form-element"><code title="">form</code> element
pointer</a> is not null, then ignore the token.</p>
<p>Otherwise:</p>
<p>Act as if a start tag token with the tag name "form" had been
seen.</p>
<p>Act as if a start tag token with the tag name "hr" had been seen.</p>
<p>Act as if a start tag token with the tag name "p" had been seen.</p>
<p>Act as if a start tag token with the tag name "label" had been
seen.</p>
<p>Act as if a stream of character tokens had been seen (see below
for what they should say).</p>
<p>Act as if a start tag token with the tag name "input" had been
seen, with all the attributes from the "isindex" token, except with
the "name" attribute set to the value "isindex" (ignoring any
explicit "name" attribute).</p>
<p>Act as if a stream of character tokens had been seen (see below
for what they should say).</p>
<p>Act as if an end tag token with the tag name "label" had been
seen.</p>
<p>Act as if an end tag token with the tag name "p" had been seen.</p>
<p>Act as if a start tag token with the tag name "hr" had been seen.</p>
<p>Act as if an end tag token with the tag name "form" had been seen.</p>
<p>The two streams of character tokens together should, together with
the <code>input</code> element, express the equivalent of "This is a
searchable index. Insert your search keywords here: (input field)"
in the user's preferred language.</p>
<p class="big-issue"> Then need to specify that if the form submission
causes just a single form control, whose name is "isindex", to be
submitted, then we submit just the value part, not the "isindex="
part.</p>
</dd>
<!-- XXX keygen support; don't forget form element pointer!
<dt>A start tag whose tag name is "keygen"</dt>
<dd>
...
</dd>
-->
<dt>A start tag whose tag name is "textarea"
</dt><dd>
<p><a href="#create">Create an element for the token</a>.</p>
<p>If the <a href="#form-element"><code title="">form</code> element
pointer</a> is not null, then <span>associate</span><!--XXX
xref! -->
the <code>textarea</code> element with the <code>form</code> element
pointed to by the <a href="#form-element"><code title="">form</code>
element pointer</a>.</p>
<p>Append the new element to the <a href="#current4">current
node</a>.</p>
<p>Switch the tokeniser's <a href="section-tokenisation.html#content2">content model flag</a>
to the RCDATA state.</p>
<p>If the next token is a U+000A LINE FEED (LF) character token, then
ignore that token and move on to the next one. (Newlines at the
start of <code>textarea</code> elements are ignored as an authoring
convenience.)</p>
<p>Then, collect all the character tokens that the tokeniser returns
until it returns a token that is not a character token, or until it
stops tokenising.</p>
<p>If this process resulted in a collection of character tokens,
append a single <code>Text</code> node, whose contents is the
concatenation of all those tokens' characters, to the new element
node.</p>
<p>The tokeniser's <a href="section-tokenisation.html#content2">content model flag</a> will
have switched back to the PCDATA state.</p>
<p>If the next token is an end tag token with the tag name
"textarea", ignore it. Otherwise, this is a <a href="section-parsing.html#parse">parse
error</a>.</p>
</dd><dt>A start tag whose tag name is one of: "iframe", "noembed",
"noframes"
</dt><dt>A start tag whose tag name is "noscript", if <a href="section-scripting.html#scripting2">scripting is enabled</a>:
</dt><dd>
<p><a href="#create">Create an element for the token</a>.</p>
<p>For "iframe" tags, the node must be an <code><a href="section-embedded.html#htmliframeelement">HTMLIFrameElement</a></code> object, for
the other tags it must be an <code><a href="section-elements.html#htmlelement">HTMLElement</a></code> object.</p>
<p>Append the new element to the <a href="#current4">current
node</a>.</p>
<p>Switch the tokeniser's <a href="section-tokenisation.html#content2">content model flag</a>
to the CDATA state.</p>
<p>Then, collect all the character tokens that the tokeniser returns
until it returns a token that is not a character token, or until it
stops tokenising.</p>
<p>If this process resulted in a collection of character tokens,
append a single <code>Text</code> node, whose contents is the
concatenation of all those tokens' characters, to the new element
node.</p>
<p>The tokeniser's <a href="section-tokenisation.html#content2">content model flag</a> will
have switched back to the PCDATA state.</p>
<p>If the next token is an end tag token with the same tag name as
the start tag token, ignore it. Otherwise, this is a <a href="section-parsing.html#parse">parse error</a>.</p>
</dd><dt>A start tag whose tag name is "select"
</dt><dd>
<p><a href="#reconstruct">Reconstruct the active formatting
elements</a>, if any.</p>
<p><a href="#insert">Insert an HTML element</a> for the token.</p>
<p>Change the <a href="#insertion0">insertion mode</a> to "<a href="#in-select" title="insertion mode: in select">in select</a>".</p>
</dd>
<!-- XXX quirks:
<dt>An end tag whose tag name is "br"</dt>
<dd>
<p>Act as if a start tag token with the tag name "br" had been
seen. Ignore the end tag token.</p>
</dd>
-->
<dt>A start or end tag whose tag name is one of: "caption", "col",
"colgroup", "frame", "frameset", "head", "option", "optgroup",
"tbody", "td", "tfoot", "th", "thead", "tr"
</dt><dt>An end tag whose tag name is one of: "area", "basefont",
"bgsound", <!--XXX quirks: remove br-->"br", "embed", "hr", "iframe",
"image", "img", "input", "isindex", "noembed", "noframes", "param",
"select", "spacer", "table", "textarea", "wbr"</dt>
<!-- add keygen if we add the start tag -->
<dt>An end tag whose tag name is "noscript", if <a href="section-scripting.html#scripting2">scripting is enabled</a>:
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd><dt>A start or end tag whose tag name is one of: "event-source",
"section", "nav", "article", "aside", "header", "footer", "datagrid",
"command"
</dt><dd> <!-- XXXX -->
<p class="big-issue">Work in progress!</p>
</dd><dt>A start tag token not covered by the previous entries
</dt><dd>
<p><a href="#reconstruct">Reconstruct the active formatting
elements</a>, if any.</p>
<p><a href="#insert">Insert an HTML element</a> for the token.</p>
<p class="note">This element will be a <a href="#phrasing">phrasing</a>
element.</p>
<!--
Put the following into the MathML namespace if parsed:
math, mrow, mfrac, msqrt, mroot, mstyle, merror, mpadded,
mphantom, mfenced, menclose, msub, msup, msubsup, munder,
mover, munderover, mmultiscripts, mtable, mlabeledtr, mtr,
mtd, maction
-->
</dd><dt>An end tag token not covered by the previous entries
</dt><dd>
<p>Run the following algorithm:</p>
<ol>
<li>
<p>Initialise <var title="">node</var> to be the <a href="#current4">current node</a> (the bottommost node of the
stack).
</p></li><li>
<p>If <var title="">node</var> has the same tag name as the end tag
token, then:</p>
<ol>
<li>
<p><a href="#generate">Generate implied end tags</a>.
</p></li><li>
<p>If the tag name of the end tag token does not match the tag
name of the <a href="#current4">current node</a>, this is a <a href="section-parsing.html#parse">parse error</a>.
</p></li><li>
<p>Pop all the nodes from the <a href="#current4">current
node</a> up to <var title="">node</var>, including <var title="">node</var>, then stop this algorithm.
</p></li></ol>
</li><li>
<p>Otherwise, if <var title="">node</var> is in neither the <a href="#formatting">formatting</a> category nor the <a href="#phrasing">phrasing</a> category, then this is a <a href="section-parsing.html#parse">parse error</a>. Stop this algorithm. The end tag
token is ignored.
</p></li><li>
<p>Set <var title="">node</var> to the previous entry in the <a href="#stack">stack of open elements</a>.
</p></li><li>
<p>Return to step 2.
</p></li></ol>
</dd></dl>
</dd><dt id="parsing-main-intable">If the <a href="#insertion0">insertion
mode</a> is "<dfn id="in-table" title="insertion mode: in table">in
table</dfn>"
</dt><dd>
<dl class="switch">
<dt>A character token that is one of one of U+0009 CHARACTER
TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C
FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dd>
<p><a href="#append" title="append a character">Append the
character</a> to the <a href="#current4">current node</a>.</p>
</dd><dt>A comment token
</dt><dd>
<p>Append a <code>Comment</code> node to the <a href="#current4">current node</a> with the <code title="">data</code> attribute set to the data given in the comment
token.</p>
</dd><dt>A start tag whose tag name is "caption"
</dt><dd>
<p><a href="#clear1">Clear the stack back to a table context</a>.
(See below.)</p>
<p>Insert a marker at the end of the <a href="#list-of4">list of
active formatting elements</a>.</p>
<p><a href="#insert">Insert an HTML element</a> for the token, then
switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-caption" title="insertion mode: in caption">in
caption</a>".</p>
</dd><dt>A start tag whose tag name is "colgroup"
</dt><dd>
<p><a href="#clear1">Clear the stack back to a table context</a>.
(See below.)</p>
<p><a href="#insert">Insert an HTML element</a> for the token, then
switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-column" title="insertion mode: in column group">in column
group</a>".</p>
</dd><dt>A start tag whose tag name is "col"
</dt><dd>
<p>Act as if a start tag token with the tag name "colgroup" had been
seen, then reprocess the current token.</p>
</dd><dt>A start tag whose tag name is one of: "tbody", "tfoot", "thead"
</dt><dd>
<p><a href="#clear1">Clear the stack back to a table context</a>.
(See below.)</p>
<p><a href="#insert">Insert an HTML element</a> for the token, then
switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-table0" title="insertion mode: in table body">in table
body</a>".</p>
</dd><dt>A start tag whose tag name is one of: "td", "th", "tr"
</dt><dd>
<p>Act as if a start tag token with the tag name "tbody" had been
seen, then reprocess the current token.</p>
</dd><dt>A start tag whose tag name is "table"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Act as if an end tag token with
the tag name "table" had been seen, then, if that token wasn't
ignored, reprocess the current token.</p>
<p class="note">The fake end tag token here can only be ignored in the
<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>.</p>
</dd><dt>An end tag whose tag name is "table"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an
element in table scope</a> with the same tag name as the token, this
is a <a href="section-parsing.html#parse">parse error</a>. Ignore the token. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</p>
<p>Otherwise:</p>
<p><a href="#generate">Generate implied end tags</a>.</p>
<p>Now, if the <a href="#current4">current node</a> is not a <code><a href="section-tabular.html#table">table</a></code> element, then this is a <a href="section-parsing.html#parse">parse error</a>.</p>
<p>Pop elements from this stack until a <code><a href="section-tabular.html#table">table</a></code> element has been popped from the
stack.</p>
<p><a href="#reset">Reset the insertion mode appropriately</a>.</p>
</dd><dt>An end tag whose tag name is one of: "body", "caption", "col",
"colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd><dt>Anything else
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Process the token as if the <a href="#insertion0">insertion mode</a> was "<a href="#in-body" title="insertion mode: in body">in body</a>", with the following
exception:</p>
<p>If the <a href="#current4">current node</a> is a <code><a href="section-tabular.html#table">table</a></code>, <code><a href="section-tabular.html#tbody">tbody</a></code>, <code><a href="section-tabular.html#tfoot0">tfoot</a></code>, <code><a href="section-tabular.html#thead0">thead</a></code>, or <code><a href="section-tabular.html#tr">tr</a></code> element, then, whenever a node would be
inserted into the <a href="#current4">current node</a>, it must
instead be inserted into the <em><a href="#foster">foster parent
element</a></em>.</p>
<p>The <dfn id="foster">foster parent element</dfn> is the parent
element of the last <code><a href="section-tabular.html#table">table</a></code> element
in the <a href="#stack">stack of open elements</a>, if there is a
<code><a href="section-tabular.html#table">table</a></code> element and it has such a
parent element. If there is no <code><a href="section-tabular.html#table">table</a></code> element in the <a href="#stack">stack
of open elements</a> (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code>
case</a>), then the <em><a href="#foster">foster parent
element</a></em> is the first element in the <a href="#stack">stack
of open elements</a> (the <code><a href="section-the-root.html#html">html</a></code>
element). Otherwise, if there is a <code><a href="section-tabular.html#table">table</a></code> element in the <a href="#stack">stack
of open elements</a>, but the last <code><a href="section-tabular.html#table">table</a></code> element in the <a href="#stack">stack
of open elements</a> has no parent, or its parent node is not an
element, then the <em><a href="#foster">foster parent
element</a></em> is the element before the last <code><a href="section-tabular.html#table">table</a></code> element in the <a href="#stack">stack
of open elements</a>.</p>
<p>If the <em><a href="#foster">foster parent element</a></em> is the
parent element of the last <code><a href="section-tabular.html#table">table</a></code>
element in the <a href="#stack">stack of open elements</a>, then the
new node must be inserted immediately <em>before</em> the last
<code><a href="section-tabular.html#table">table</a></code> element in the <a href="#stack">stack of open elements</a> in the <a href="#foster">foster parent element</a>; otherwise, the new node
must be <em>appended</em> to the <a href="#foster">foster parent
element</a>.</p>
</dd></dl>
<p>When the steps above require the UA to <dfn id="clear1">clear the
stack back to a table context</dfn>, it means that the UA must, while
the <a href="#current4">current node</a> is not a <code><a href="section-tabular.html#table">table</a></code> element or an <code><a href="section-the-root.html#html">html</a></code> element, pop elements from the <a href="#stack">stack of open elements</a>. If this causes any elements
to be popped from the stack, then this is a <a href="section-parsing.html#parse">parse
error</a>.</p>
<p class="note">The <a href="#current4">current node</a> being an
<code><a href="section-the-root.html#html">html</a></code> element after this process is an
<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>.</p>
</dd><dt id="parsing-main-incaption">If the <a href="#insertion0">insertion
mode</a> is "<dfn id="in-caption" title="insertion mode: in caption">in
caption</dfn>"
</dt><dd>
<dl class="switch">
<dt>An end tag whose tag name is "caption"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an
element in table scope</a> with the same tag name as the token, this
is a <a href="section-parsing.html#parse">parse error</a>. Ignore the token. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</p>
<p>Otherwise:</p>
<p><a href="#generate">Generate implied end tags</a>.</p>
<p>Now, if the <a href="#current4">current node</a> is not a <code><a href="section-tabular.html#caption0">caption</a></code> element, then this is a <a href="section-parsing.html#parse">parse error</a>.</p>
<p>Pop elements from this stack until a <code><a href="section-tabular.html#caption0">caption</a></code> element has been popped from the
stack.</p>
<p><a href="#clear0">Clear the list of active formatting elements up
to the last marker</a>.</p>
<p>Switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-table" title="insertion mode: in table">in table</a>".</p>
</dd><dt>A start tag whose tag name is one of: "caption", "col",
"colgroup", "tbody", "td", "tfoot", "th", "thead", "tr"
</dt><dt>An end tag whose tag name is "table"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Act as if an end tag with the
tag name "caption" had been seen, then, if that token wasn't
ignored, reprocess the current token.</p>
<p class="note">The fake end tag token here can only be ignored in the
<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>.</p>
</dd><dt>An end tag whose tag name is one of: "body", "col", "colgroup",
"html", "tbody", "td", "tfoot", "th", "thead", "tr"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd><dt>Anything else
</dt><dd>
<p>Process the token as if the <a href="#insertion0">insertion
mode</a> was "<a href="#in-body" title="insertion mode: in body">in
body</a>".</p>
</dd></dl>
</dd><dt id="parsing-main-incolgroup">If the <a href="#insertion0">insertion
mode</a> is "<dfn id="in-column" title="insertion mode: in column
group">in column group</dfn>"
</dt><dd>
<dl class="switch">
<dt>A character token that is one of one of U+0009 CHARACTER
TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C
FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dd>
<p><a href="#append" title="append a character">Append the
character</a> to the <a href="#current4">current node</a>.</p>
</dd><dt>A comment token
</dt><dd>
<p>Append a <code>Comment</code> node to the <a href="#current4">current node</a> with the <code title="">data</code> attribute set to the data given in the comment
token.</p>
</dd><dt>A start tag whose tag name is "col"
</dt><dd>
<p><a href="#insert" title="insert an HTML element">Insert a
<code>col</code> element</a> for the token. Immediately pop the <a href="#current4">current node</a> off the <a href="#stack">stack of
open elements</a>.</p>
</dd><dt>An end tag whose tag name is "colgroup"
</dt><dd>
<p>If the <a href="#current4">current node</a> is the root <code><a href="section-the-root.html#html">html</a></code> element, then this is a <a href="section-parsing.html#parse">parse error</a>, ignore the token. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</p>
<p>Otherwise, pop the <a href="#current4">current node</a> (which
will be a <code><a href="section-tabular.html#colgroup">colgroup</a></code> element)
from the <a href="#stack">stack of open elements</a>. Switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-table" title="insertion mode: in table">in table</a>".</p>
</dd><dt>An end tag whose tag name is "col"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd><dt>Anything else
</dt><dd>
<p>Act as if an end tag with the tag name "colgroup" had been seen,
and then, if that token wasn't ignored, reprocess the current token.</p>
<p class="note">The fake end tag token here can only be ignored in the
<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>.</p>
</dd></dl>
</dd><dt id="parsing-main-intbody">If the <a href="#insertion0">insertion
mode</a> is "<dfn id="in-table0" title="insertion mode: in table body">in
table body</dfn>"
</dt><dd>
<dl class="switch">
<dt>A start tag whose tag name is "tr"
</dt><dd>
<p><a href="#clear2">Clear the stack back to a table body
context</a>. (See below.)</p>
<p><a href="#insert" title="insert an HTML element">Insert a
<code>tr</code> element</a> for the token, then switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-row" title="insertion mode: in row">in row</a>".</p>
</dd><dt>A start tag whose tag name is one of: "th", "td"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Act as if a start tag with the
tag name "tr" had been seen, then reprocess the current token.</p>
</dd><dt>An end tag whose tag name is one of: "tbody", "tfoot", "thead"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an
element in table scope</a> with the same tag name as the token, this
is a <a href="section-parsing.html#parse">parse error</a>. Ignore the token.</p>
<p>Otherwise:</p>
<p><a href="#clear2">Clear the stack back to a table body
context</a>. (See below.)</p>
<p>Pop the <a href="#current4">current node</a> from the <a href="#stack">stack of open elements</a>. Switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-table" title="insertion mode: in table">in table</a>".</p>
</dd><dt>A start tag whose tag name is one of: "caption", "col",
"colgroup", "tbody", "tfoot", "thead"
</dt><dt>An end tag whose tag name is "table"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have a
<code>tbody</code>, <code>thead</code>, or <code>tfoot</code>
element in table scope</a>, this is a <a href="section-parsing.html#parse">parse
error</a>. Ignore the token. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</p>
<p>Otherwise:</p>
<p><a href="#clear2">Clear the stack back to a table body
context</a>. (See below.)</p>
<p>Act as if an end tag with the same tag name as the <a href="#current4">current node</a> ("tbody", "tfoot", or "thead") had
been seen, then reprocess the current token.</p>
</dd><dt>An end tag whose tag name is one of: "body", "caption", "col",
"colgroup", "html", "td", "th", "tr"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd><dt>Anything else
</dt><dd>
<p>Process the token as if the <a href="#insertion0">insertion
mode</a> was "<a href="#in-table" title="insertion mode: in
table">in table</a>".</p>
</dd></dl>
<p>When the steps above require the UA to <dfn id="clear2">clear the
stack back to a table body context</dfn>, it means that the UA must,
while the <a href="#current4">current node</a> is not a <code><a href="section-tabular.html#tbody">tbody</a></code>, <code><a href="section-tabular.html#tfoot0">tfoot</a></code>, <code><a href="section-tabular.html#thead0">thead</a></code>, or <code><a href="section-the-root.html#html">html</a></code> element, pop elements from the <a href="#stack">stack of open elements</a>. If this causes any elements
to be popped from the stack, then this is a <a href="section-parsing.html#parse">parse
error</a>.</p>
<p class="note">The <a href="#current4">current node</a> being an
<code><a href="section-the-root.html#html">html</a></code> element after this process is an
<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>.</p>
</dd><dt id="parsing-main-intr">If the <a href="#insertion0">insertion mode</a>
is "<dfn id="in-row" title="insertion mode: in row">in row</dfn>"
</dt><dd>
<dl class="switch">
<dt>A start tag whose tag name is one of: "th", "td"
</dt><dd>
<p><a href="#clear3">Clear the stack back to a table row context</a>.
(See below.)</p>
<p><a href="#insert" title="insert an HTML element">Insert an HTML
element</a> for the token, then switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-cell" title="insertion mode: in cell">in cell</a>".</p>
<p>Insert a marker at the end of the <a href="#list-of4">list of
active formatting elements</a>.</p>
</dd><dt>An end tag whose tag name is "tr"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an
element in table scope</a> with the same tag name as the token, this
is a <a href="section-parsing.html#parse">parse error</a>. Ignore the token. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</p>
<p>Otherwise:</p>
<p><a href="#clear3">Clear the stack back to a table row context</a>.
(See below.)</p>
<p>Pop the <a href="#current4">current node</a> (which will be a
<code><a href="section-tabular.html#tr">tr</a></code> element) from the <a href="#stack">stack of open elements</a>. Switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-table0" title="insertion mode: in table body">in table body</a>".</p>
</dd><dt>A start tag whose tag name is one of: "caption", "col",
"colgroup", "tbody", "tfoot", "thead", "tr"
</dt><dt>An end tag whose tag name is "table"
</dt><dd>
<p>Act as if an end tag with the tag name "tr" had been seen, then,
if that token wasn't ignored, reprocess the current token.</p>
<p class="note">The fake end tag token here can only be ignored in the
<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>.</p>
</dd><dt>An end tag whose tag name is one of: "tbody", "tfoot", "thead"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an
element in table scope</a> with the same tag name as the token, this
is a <a href="section-parsing.html#parse">parse error</a>. Ignore the token.</p>
<p>Otherwise, act as if an end tag with the tag name "tr" had been
seen, then reprocess the current token.</p>
</dd><dt>An end tag whose tag name is one of: "body", "caption", "col",
"colgroup", "html", "td", "th"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd><dt>Anything else
</dt><dd>
<p>Process the token as if the <a href="#insertion0">insertion
mode</a> was "<a href="#in-table" title="insertion mode: in
table">in table</a>".</p>
</dd></dl>
<p>When the steps above require the UA to <dfn id="clear3">clear the
stack back to a table row context</dfn>, it means that the UA must,
while the <a href="#current4">current node</a> is not a <code><a href="section-tabular.html#tr">tr</a></code> element or an <code><a href="section-the-root.html#html">html</a></code> element, pop elements from the <a href="#stack">stack of open elements</a>. If this causes any elements
to be popped from the stack, then this is a <a href="section-parsing.html#parse">parse
error</a>.</p>
<p class="note">The <a href="#current4">current node</a> being an
<code><a href="section-the-root.html#html">html</a></code> element after this process is an
<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>.</p>
</dd><dt id="parsing-main-intd">If the <a href="#insertion0">insertion mode</a>
is "<dfn id="in-cell" title="insertion mode: in cell">in cell</dfn>"
</dt><dd>
<dl class="switch">
<dt>An end tag whose tag name is one of: "td", "th"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an
element in table scope</a> with the same tag name as that of the
token, then this is a <a href="section-parsing.html#parse">parse error</a> and the token
must be ignored.</p>
<p>Otherwise:</p>
<p><a href="#generate">Generate implied end tags</a>, except for
elements with the same tag name as the token.</p>
<p>Now, if the <a href="#current4">current node</a> is not an element
with the same tag name as the token, then this is a <a href="section-parsing.html#parse">parse error</a>.</p>
<p>Pop elements from this stack until an element with the same tag
name as the token has been popped from the stack.</p>
<p><a href="#clear0">Clear the list of active formatting elements up
to the last marker</a>.</p>
<p>Switch the <a href="#insertion0">insertion mode</a> to "<a href="#in-row" title="insertion mode: in row">in row</a>". (The <a href="#current4">current node</a> will be a <code><a href="section-tabular.html#tr">tr</a></code> element at this point.)</p>
</dd><dt>A start tag whose tag name is one of: "caption", "col",
"colgroup", "tbody", "td", "tfoot", "th", "thead", "tr"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> does
<em>not</em> <a href="#have-an0" title="has an element in table
scope">have a <code>td</code> or <code>th</code> element in table
scope</a>, then this is a <a href="section-parsing.html#parse">parse error</a>; ignore
the token. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</p>
<p>Otherwise, <a href="#close2">close the cell</a> (see below) and
reprocess the current token.</p>
</dd><dt>An end tag whose tag name is one of: "body", "caption", "col",
"colgroup", "html"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd><dt>An end tag whose tag name is one of: "table", "tbody", "tfoot",
"thead", "tr"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an
element in table scope</a> with the same tag name as that of the
token (which can only happen for "tbody", "tfoot" and "thead", or,
in the <a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>), then
this is a <a href="section-parsing.html#parse">parse error</a> and the token must be
ignored.</p>
<p>Otherwise, <a href="#close2">close the cell</a> (see below) and
reprocess the current token.</p>
</dd><dt>Anything else
</dt><dd>
<p>Process the token as if the <a href="#insertion0">insertion
mode</a> was "<a href="#in-body" title="insertion mode: in body">in
body</a>".</p>
</dd></dl>
<p>Where the steps above say to <dfn id="close2">close the cell</dfn>,
they mean to follow the following algorithm:</p>
<ol>
<li>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an0" title="has an element in table scope">has a
<code>td</code> element in table scope</a>, then act as if an end
tag token with the tag name "td" had been seen.
</p></li><li>
<p>Otherwise, the <a href="#stack">stack of open elements</a> will <a href="#have-an0" title="has an element in table scope">have a
<code>th</code> element in table scope</a>; act as if an end tag
token with the tag name "th" had been seen.
</p></li></ol>
<p class="note">The <a href="#stack">stack of open elements</a> cannot
have both a <code><a href="section-tabular.html#td">td</a></code> and a <code><a href="section-tabular.html#th">th</a></code> element <a href="#have-an0" title="has an
element in table scope">in table scope</a> at the same time, nor can
it have neither when the <a href="#insertion0">insertion mode</a> is
"<a href="#in-cell" title="insertion mode: in cell">in cell</a>".</p>
</dd><dt id="parsing-main-inselect">If the <a href="#insertion0">insertion
mode</a> is "<dfn id="in-select" title="insertion mode: in select">in
select</dfn>"
</dt><dd>
<p>Handle the token as follows:</p>
<dl class="switch">
<dt>A character token
</dt><dd>
<p><a href="#append" title="append a character">Append the token's
character</a> to the <a href="#current4">current node</a>.</p>
</dd><dt>A comment token
</dt><dd>
<p>Append a <code>Comment</code> node to the <a href="#current4">current node</a> with the <code title="">data</code> attribute set to the data given in the comment
token.</p>
</dd><dt>A start tag token whose tag name is "option"
</dt><dd>
<p>If the <a href="#current4">current node</a> is an
<code>option</code> element, act as if an end tag with the tag name
"option" had been seen.</p>
<p><a href="#insert">Insert an HTML element</a> for the token.</p>
</dd><dt>A start tag token whose tag name is "optgroup"
</dt><dd>
<p>If the <a href="#current4">current node</a> is an
<code>option</code> element, act as if an end tag with the tag name
"option" had been seen.</p>
<p>If the <a href="#current4">current node</a> is an
<code>optgroup</code> element, act as if an end tag with the tag
name "optgroup" had been seen.</p>
<p><a href="#insert">Insert an HTML element</a> for the token.</p>
</dd><dt>An end tag token whose tag name is "optgroup"
</dt><dd>
<p>First, if the <a href="#current4">current node</a> is an
<code>option</code> element, and the node immediately before it in
the <a href="#stack">stack of open elements</a> is an
<code>optgroup</code> element, then act as if an end tag with the
tag name "option" had been seen.</p>
<p>If the <a href="#current4">current node</a> is an
<code>optgroup</code> element, then pop that node from the <a href="#stack">stack of open elements</a>. Otherwise, this is a <a href="section-parsing.html#parse">parse error</a>, ignore the token.</p>
</dd><dt>An end tag token whose tag name is "option"
</dt><dd>
<p>If the <a href="#current4">current node</a> is an
<code>option</code> element, then pop that node from the <a href="#stack">stack of open elements</a>. Otherwise, this is a <a href="section-parsing.html#parse">parse error</a>, ignore the token.</p>
</dd><dt>An end tag whose tag name is "select"
</dt><dd>
<p>If the <a href="#stack">stack of open elements</a> does not <a href="#have-an0" title="has an element in table scope">have an
element in table scope</a> with the same tag name as the token, this
is a <a href="section-parsing.html#parse">parse error</a>. Ignore the token. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</p>
<p>Otherwise:</p>
<p>Pop elements from the <a href="#stack">stack of open elements</a>
until a <code>select</code> element has been popped from the stack.</p>
<p><a href="#reset">Reset the insertion mode appropriately</a>.</p>
</dd><dt>A start tag whose tag name is "select"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Act as if the token had been an
end tag with the tag name "select" instead.</p>
</dd><dt>An end tag whose tag name is one of: "caption", "table", "tbody",
"tfoot", "thead", "tr", "td", "th"
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>.</p>
<p>If the <a href="#stack">stack of open elements</a> <a href="#have-an0">has an element in table scope</a> with the same tag
name as that of the token, then act as if an end tag with the tag
name "select" had been seen, and reprocess the token. Otherwise,
ignore the token.</p>
</dd><dt>Anything else
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd></dl>
</dd><dt id="parsing-main-afterbody">If the <a href="#insertion0">insertion
mode</a> is "<dfn id="after2" title="insertion mode: after body">after
body</dfn>"
</dt><dd>
<p>Handle the token as follows:</p>
<dl class="switch">
<dt>A character token that is one of one of U+0009 CHARACTER
TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C
FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dd>
<p>Process the token as it would be processed if the <a href="#insertion0">insertion mode</a> was "<a href="#in-body" title="insertion mode: in body">in body</a>".</p>
</dd><dt>A comment token
</dt><dd>
<p>Append a <code>Comment</code> node to the first element in the <a href="#stack">stack of open elements</a> (the <code><a href="section-the-root.html#html">html</a></code> element), with the <code title="">data</code> attribute set to the data given in the comment
token.</p>
</dd><dt>An end tag with the tag name "html"
</dt><dd>
<p>If the parser was originally created in order to handle the
setting of <em>an element</em>'s <code title="dom-innerHTML-HTML"><a href="section-dynamic.html#innerhtml0">innerHTML</a></code> attribute, this is a <a href="section-parsing.html#parse">parse error</a>; ignore the token. (The element will
be an <code><a href="section-the-root.html#html">html</a></code> element in this case.)
(<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</p>
<p>Otherwise, switch to <a href="#the-trailing0">the trailing end
phase</a>.</p>
</dd><dt>Anything else
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Set the <a href="#insertion0">insertion mode</a> to "<a href="#in-body" title="insertion mode: in body">in body</a>" and reprocess the
token.</p>
</dd></dl>
</dd><dt id="parsing-main-inframeset">If the <a href="#insertion0">insertion
mode</a> is "<dfn id="in-frameset" title="insertion mode: in frameset">in
frameset</dfn>"
</dt><dd>
<p>Handle the token as follows:</p>
<dl class="switch">
<dt>A character token that is one of one of U+0009 CHARACTER
TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C
FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dd>
<p><a href="#append" title="append a character">Append the
character</a> to the <a href="#current4">current node</a>.</p>
</dd><dt>A comment token
</dt><dd>
<p>Append a <code>Comment</code> node to the <a href="#current4">current node</a> with the <code title="">data</code> attribute set to the data given in the comment
token.</p>
</dd><dt>A start tag with the tag name "frameset"
</dt><dd>
<p><a href="#insert" title="Insert an HTML element">Insert a
<code>frameset</code> element</a> for the token.</p>
</dd><dt>An end tag with the tag name "frameset"
</dt><dd>
<p>If the <a href="#current4">current node</a> is the root <code><a href="section-the-root.html#html">html</a></code> element, then this is a <a href="section-parsing.html#parse">parse error</a>; ignore the token. (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>)</p>
<p>Otherwise, pop the <a href="#current4">current node</a> from the
<a href="#stack">stack of open elements</a>.</p>
<p>If the parser was <em>not</em> originally created in order to
handle the setting of an element's <code title="dom-innerHTML-HTML"><a href="section-dynamic.html#innerhtml0">innerHTML</a></code> attribute (<a href="section-dynamic.html#innerhtml1"><code>innerHTML</code> case</a>), and the <a href="#current4">current node</a> is no longer a
<code>frameset</code> element, then change the <a href="#insertion0">insertion mode</a> to "<a href="#after3" title="insertion mode: after frameset">after frameset</a>".</p>
</dd><dt>A start tag with the tag name "frame"
</dt><dd>
<p><a href="#insert">Insert an HTML element</a> for the token.
Immediately pop the <a href="#current4">current node</a> off the <a href="#stack">stack of open elements</a>.</p>
</dd><dt>A start tag with the tag name "noframes"
</dt><dd>
<p>Process the token as if the <a href="#insertion0">insertion
mode</a> had been "<a href="#in-body" title="insertion mode: in
body">in body</a>".</p>
</dd><dt>Anything else
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd></dl>
</dd><dt id="parsing-main-afterframeset">If the <a href="#insertion0">insertion
mode</a> is "<dfn id="after3" title="insertion mode: after
frameset">after frameset</dfn>"
</dt><dd>
<p>Handle the token as follows:</p>
<dl class="switch">
<dt>A character token that is one of one of U+0009 CHARACTER
TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C
FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dd>
<p><a href="#append" title="append a character">Append the
character</a> to the <a href="#current4">current node</a>.</p>
</dd><dt>A comment token
</dt><dd>
<p>Append a <code>Comment</code> node to the <a href="#current4">current node</a> with the <code title="">data</code> attribute set to the data given in the comment
token.</p>
</dd><dt>An end tag with the tag name "html"
</dt><dd>
<p>Switch to <a href="#the-trailing0">the trailing end phase</a>.</p>
</dd><dt>A start tag with the tag name "noframes"
</dt><dd>
<p>Process the token as if the <a href="#insertion0">insertion
mode</a> had been "<a href="#in-body" title="insertion mode: in
body">in body</a>".</p>
</dd><dt>Anything else
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd></dl>
</dd></dl>
</dd></dl>
<p class="big-issue">This doesn't handle UAs that don't support frames, or
that do support frames but want to show the NOFRAMES content. Supporting
the former is easy; supporting the latter is harder.
</p><h5 id="the-trailing"><span class="secno">8.2.4.4. </span><dfn id="the-trailing0">The trailing end phase</dfn></h5>
<p>After <a href="#the-main0">the main phase</a>, as each token is emitted
from the <a href="section-tokenisation.html#tokenisation0">tokenisation</a> stage, it must be
processed as described in this section.
</p><dl class="switch">
<dt>A DOCTYPE token
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Ignore the token.</p>
</dd><dt>A comment token
</dt><dd>
<p>Append a <code>Comment</code> node to the <code>Document</code> object
with the <code title="">data</code> attribute set to the data given in
the comment token.</p>
</dd><dt>A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dd>
<p>Process the token as it would be processed in <a href="#the-main0">the
main phase</a>.</p>
</dd><dt>A character token that is <em>not</em> one of U+0009 CHARACTER
TABULATION, U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM
FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
</dt><dt>A start tag token
</dt><dt>An end tag token
</dt><dd>
<p><a href="section-parsing.html#parse">Parse error</a>. Switch back to <a href="#the-main0">the main phase</a> and reprocess the token.</p>
</dd><dt>An end-of-file token
</dt><dd>
<p><a href="#stops">Stop parsing</a>.</p>
</dd></dl>
<h4 id="the-end"><span class="secno">8.2.5. </span>The End</h4>
<p>Once the user agent <dfn id="stops" title="stop parsing">stops
parsing</dfn> the document, the user agent must follow the steps in this
section.
</p><p>First, <!--the user agent must <span title="fire a DOMContentLoaded
event">fire a <code
title="event-DOMContentLoaded">DOMContentLoaded</code> event</span>
at <span>the <code>body</code> element</span>.</p>
<p>Then, -->the
rules for <a href="section-scripting0.html#when-a">when a script completes loading</a> start
applying (script execution is no longer managed by the parser).
</p><p>If any of the scripts in the <a href="section-scripting0.html#list-of1">list of scripts that
will execute as soon as possible</a> have <span>completed
loading</span><!-- XXX xref -->, or if the <a href="section-scripting0.html#list-of0">list of
scripts that will execute asynchronously</a> is not empty and the first
script in that list has <span>completed loading</span><!-- XXX xref
-->,
then the user agent must act as if those scripts just completed loading,
following the rules given for that in the <code><a href="section-scripting0.html#script0">script</a></code> element definition.
</p><p>Then, if the <a href="section-scripting0.html#list-of">list of scripts that will execute when
the document has finished parsing</a> is not empty, and the first item in
this list has already <span>completed loading</span><!--XXX
xref -->,
then the user agent must act as if that script just finished loading.
</p><p>By this point, there will be no scripts that have loaded but have not
yet been executed.
</p><p>The user agent must then <a href="section-scripting.html#firing2">fire a simple event</a>
called <code title="event-DOMContentLoaded">DOMContentLoaded</code> at the
<code>Document</code>.
</p><p>Once everything that <dfn id="delays" title="delay the load event">delays
the load event</dfn> has completed, the user agent must <a href="section-scripting.html#firing4" title="fire a load event">fire a <code title="event-load">load</code>
event</a> at <a href="section-dom-tree.html#the-body0">the <code>body</code> element</a>.</p>
<!-- XXX make sure things "delay the load event" -->
<!--XXX need to handle
http://lxr.mozilla.org/mozilla/source/parser/htmlparser/src/CNavDTD.cpp#2354
2354 // Don't open transient styles if it makes the stack deep, bug 58917.
-->
<!--XXX
http://lxr.mozilla.org/mozilla/source/parser/htmlparser/src/nsHTMLTokenizer.cpp#749
-->
<!--
see also CTextToken::ConsumeCharacterData() for CDATA parsing?
1212 1 Here's a tricky case from bug 22596: <h5><li><h5>
1213 How do we know that the 2nd <h5> should close the <LI> rather than nest inside the <LI>?
1214 (Afterall, the <h5> is a legal child of the <LI>).
1215
1216 The way you know is that there is no root between the two, so the <h5> binds more
1217 tightly to the 1st <h5> than to the <LI>.
1218 2. Also, bug 6148 shows this case: <SPAN><DIV><SPAN>
1219 From this case we learned not to execute this logic if the parent is a block.
1220
1221 3. Fix for 26583
1222 Ex. <A href=foo.html><B>foo<A href-bar.html>bar</A></B></A> <- A legal HTML
1223 In the above example clicking on "foo" or "bar" should link to
1224 foo.html or bar.html respectively. That is, the inner <A> should be informed
1225 about the presence of an open <A> above <B>..so that the inner <A> can close out
1226 the outer <A>. The following code does it for us.
1227
1228 4. Fix for 27865 [ similer to 22596 ]. Ex: <DL><DD><LI>one<DD><LI>two
- http://lxr.mozilla.org/mozilla/source/parser/htmlparser/src/CNavDTD.cpp#1211
815 // Here's a problem. If theTag is legal in here, we don't move it
816 // out. So if we're moving stuff out of here, the parent of theTag
817 // gets closed at this point. But some things are legal
818 // _everywhere_ and hence would effectively close out misplaced
819 // content in tables. This is undesirable, so treat them as
820 // illegal here so they'll be shipped out with their parents and
821 // siblings. See bug 40855 for an explanation (that bug was for
822 // comments, but the same issues arise with whitespace, newlines,
823 // noscript, etc). Script is special, though. Shipping it out
824 // breaks document.write stuff. See bug 243064.
- http://lxr.mozilla.org/mozilla/source/parser/htmlparser/src/CNavDTD.cpp#825
1326 /**************************************************************************************
1327 *
1328 * Now a little code to deal with bug #49687 (crash when layout stack gets too deep)
1329 * I've also opened this up to any container (not just inlines): re bug 55095
1330 * Improved to handle bug 55980 (infinite loop caused when DEPTH is exceeded and
1331 * </P> is encountered by itself (<P>) is continuously produced.
1332 *
1333 **************************************************************************************/
1912 // Oh boy!! we found a "stray" tag. Nav4.x and IE introduce line break in
1913 // such cases. So, let's simulate that effect for compatibility.
1914 // Ex. <html><body>Hello</P>There</body></html>
http://lxr.mozilla.org/mozilla/source/parser/htmlparser/src/CNavDTD.cpp#1912
http://lxr.mozilla.org/seamonkey/search?string=nested
/parser/htmlparser/src/CNavDTD.cpp, line 791 - * 2. <CENTER><DL><DT><A><CENTER> allow nested <CENTER>
/parser/htmlparser/src/CNavDTD.cpp, line 792 - * 3. <TABLE><TR><TD><TABLE>... allow nested <TABLE>
/parser/htmlparser/src/CNavDTD.cpp, line 2562 - // Discard nested forms - bug 72639
/parser/htmlparser/src/nsElementTable.cpp, line 1453 - * 2. <CENTER><DL><DT><A><CENTER> allow nested <CENTER>
/parser/htmlparser/src/nsElementTable.cpp, line 1454 - * 3. <TABLE><TR><TD><TABLE>... allow nested <TABLE>
/parser/htmlparser/src/nsElementTable.cpp, line 1901 - // Ex: <H1><LI><H1><LI>. Inner LI has the potential of getting nested
-->
<script src="http://status.whatwg.org/annotate-web-apps.js" type="text/javascript"></script></body></html>
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