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v811_spc009/external/owasp/sanitizer/lib/htmlparser-1.3/doc/tree-construction.txt

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#8.2.4 Tokenization Table of contents 8.4 Serializing HTML fragments
WHATWG
HTML 5
Draft Recommendation — 13 January 2009
← 8.2.4 Tokenization – Table of contents – 8.4 Serializing HTML
fragments →
8.2.5 Tree construction
The input to the tree construction stage is a sequence of tokens from
the tokenization stage. The tree construction stage is associated with
a DOM Document object when a parser is created. The "output" of this
stage consists of dynamically modifying or extending that document's
DOM tree.
This specification does not define when an interactive user agent has
to render the Document so that it is available to the user, or when it
has to begin accepting user input.
As each token is emitted from the tokeniser, the user agent must
process the token according to the rules given in the section
corresponding to the current insertion mode.
When the steps below require the UA to insert a character into a node,
if that node has a child immediately before where the character is to
be inserted, and that child is a Text node, and that Text node was the
last node that the parser inserted into the document, then the
character must be appended to that Text node; otherwise, a new Text
node whose data is just that character must be inserted in the
appropriate place.
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 document.write() and document.writeln() calls. [DOM3EVENTS]
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.
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 implementors are encouraged to
avoid arbitrary limits, it is recognized that practical concerns will
likely force user agents to impose nesting depths.
8.2.5.1 Creating and inserting elements
When the steps below require the UA to create an element for a token in
a particular namespace, the UA must create a node implementing the
interface appropriate for the element type corresponding to the tag
name of the token in the given namespace (as given in the specification
that defines that element, e.g. for an a element in the HTML namespace,
this specification defines it to be the HTMLAnchorElement interface),
with the tag name being the name of that element, with the node being
in the given namespace, and with the attributes on the node being those
given in the given token.
The interface appropriate for an element in the HTML namespace that is
not defined in this specification is HTMLElement. The interface
appropriate for an element in another namespace that is not defined by
that namespace's specification is Element.
When a resettable element is created in this manner, its reset
algorithm must be invoked once the attributes are set. (This
initializes the element's value and checkedness based on the element's
attributes.)
__________________________________________________________________
When the steps below require the UA to insert an HTML element for a
token, the UA must first create an element for the token in the HTML
namespace, and then append this node to the current node, and push it
onto the stack of open elements so that it is the new current node.
The steps below may also require that the UA insert an HTML element in
a particular place, in which case the UA must follow the same steps
except that it must insert or append the new node in the location
specified instead of appending it to the current node. (This happens in
particular during the parsing of tables with invalid content.)
If an element created by the insert an HTML element algorithm is a
form-associated element, and the form element pointer is not null, and
the newly created element doesn't have a form attribute, the user agent
must associate the newly created element with the form element pointed
to by the form element pointer before inserting it wherever it is to be
inserted.
__________________________________________________________________
When the steps below require the UA to insert a foreign element for a
token, the UA must first create an element for the token in the given
namespace, and then append this node to the current node, and push it
onto the stack of open elements so that it is the new current node. If
the newly created element has an xmlns attribute in the XMLNS namespace
whose value is not exactly the same as the element's namespace, that is
a parse error.
When the steps below require the user agent to adjust MathML attributes
for a token, then, if the token has an attribute named definitionurl,
change its name to definitionURL (note the case difference).
When the steps below require the user agent to adjust foreign
attributes for a token, then, if any of the attributes on the token
match the strings given in the first column of the following table, let
the attribute be a namespaced attribute, with the prefix being the
string given in the corresponding cell in the second column, the local
name being the string given in the corresponding cell in the third
column, and the namespace being the namespace given in the
corresponding cell in the fourth column. (This fixes the use of
namespaced attributes, in particular xml:lang.)
Attribute name Prefix Local name Namespace
xlink:actuate xlink actuate XLink namespace
xlink:arcrole xlink arcrole XLink namespace
xlink:href xlink href XLink namespace
xlink:role xlink role XLink namespace
xlink:show xlink show XLink namespace
xlink:title xlink title XLink namespace
xlink:type xlink type XLink namespace
xml:base xml base XML namespace
xml:lang xml lang XML namespace
xml:space xml space XML namespace
xmlns (none) xmlns XMLNS namespace
xmlns:xlink xmlns xlink XMLNS namespace
__________________________________________________________________
The generic CDATA element parsing algorithm and the generic RCDATA
element parsing algorithm consist of the following steps. These
algorithms are always invoked in response to a start tag token.
1. Insert an HTML element for the token.
2. If the algorithm that was invoked is the generic CDATA element
parsing algorithm, switch the tokeniser's content model flag to the
CDATA state; otherwise the algorithm invoked was the generic RCDATA
element parsing algorithm, switch the tokeniser's content model
flag to the RCDATA state.
3. Let the original insertion mode be the current insertion mode.
4. Then, switch the insertion mode to "in CDATA/RCDATA".
8.2.5.2 Closing elements that have implied end tags
When the steps below require the UA to generate implied end tags, then,
while the current node is a dd element, a dt element, an li element, an
option element, an optgroup element, a p element, an rp element, or an
rt element, the UA must pop the current node off the stack of open
elements.
If a step 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.
8.2.5.3 Foster parenting
Foster parenting happens when content is misnested in tables.
When a node node is to be foster parented, the node node must be
inserted into the foster parent element, and the current table must be
marked as tainted. (Once the current table has been tainted, whitespace
characters are inserted into the foster parent element instead of the
current node.)
The foster parent element is the parent element of the last table
element in the stack of open elements, if there is a table element and
it has such a parent element. If there is no table element in the stack
of open elements (fragment case), then the foster parent element is the
first element in the stack of open elements (the html element).
Otherwise, if there is a table element in the stack of open elements,
but the last table element in the stack of open elements has no parent,
or its parent node is not an element, then the foster parent element is
the element before the last table element in the stack of open
elements.
If the foster parent element is the parent element of the last table
element in the stack of open elements, then node must be inserted
immediately before the last table element in the stack of open elements
in the foster parent element; otherwise, node must be appended to the
foster parent element.
8.2.5.4 The "initial" insertion mode
When the insertion mode is "initial", tokens must be handled as
follows:
A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000C FORM FEED (FF), or U+0020 SPACE
Ignore the token.
A comment token
Append a Comment node to the Document object with the data
attribute set to the data given in the comment token.
A DOCTYPE token
If the DOCTYPE token's name is not a case-sensitive match for
the string "html", or if the token's public identifier is
neither missing nor a case-sensitive match for the string
"XSLT-compat", or if the token's system identifier is not
missing, then there is a parse error (this is the DOCTYPE parse
error). Conformance checkers may, instead of reporting this
error, switch to a conformance checking mode for another
language (e.g. based on the DOCTYPE token a conformance checker
could recognize that the document is an HTML4-era document, and
defer to an HTML4 conformance checker.)
Append a DocumentType node to the Document node, with the name
attribute set to the name given in the DOCTYPE token; the
publicId attribute set to the public identifier given in the
DOCTYPE token, or the empty string if the public identifier was
missing; the systemId attribute set to the system identifier
given in the DOCTYPE token, or the empty string if the system
identifier was missing; and the other attributes specific to
DocumentType objects set to null and empty lists as appropriate.
Associate the DocumentType node with the Document object so that
it is returned as the value of the doctype attribute of the
Document object.
Then, if the DOCTYPE token matches one of the conditions in the
following list, then set the document to quirks mode:
+ The force-quirks flag is set to on.
+ The name is set to anything other than "HTML".
+ The public identifier starts with: "+//Silmaril//dtd html Pro
v0r11 19970101//"
+ The public identifier starts with: "-//AdvaSoft Ltd//DTD HTML
3.0 asWedit + extensions//"
+ The public identifier starts with: "-//AS//DTD HTML 3.0
asWedit + extensions//"
+ The public identifier starts with: "-//IETF//DTD HTML 2.0
Level 1//"
+ The public identifier starts with: "-//IETF//DTD HTML 2.0
Level 2//"
+ The public identifier starts with: "-//IETF//DTD HTML 2.0
Strict Level 1//"
+ The public identifier starts with: "-//IETF//DTD HTML 2.0
Strict Level 2//"
+ The public identifier starts with: "-//IETF//DTD HTML 2.0
Strict//"
+ The public identifier starts with: "-//IETF//DTD HTML 2.0//"
+ The public identifier starts with: "-//IETF//DTD HTML 2.1E//"
+ The public identifier starts with: "-//IETF//DTD HTML 3.0//"
+ The public identifier starts with: "-//IETF//DTD HTML 3.2
Final//"
+ The public identifier starts with: "-//IETF//DTD HTML 3.2//"
+ The public identifier starts with: "-//IETF//DTD HTML 3//"
+ The public identifier starts with: "-//IETF//DTD HTML Level
0//"
+ The public identifier starts with: "-//IETF//DTD HTML Level
1//"
+ The public identifier starts with: "-//IETF//DTD HTML Level
2//"
+ The public identifier starts with: "-//IETF//DTD HTML Level
3//"
+ The public identifier starts with: "-//IETF//DTD HTML Strict
Level 0//"
+ The public identifier starts with: "-//IETF//DTD HTML Strict
Level 1//"
+ The public identifier starts with: "-//IETF//DTD HTML Strict
Level 2//"
+ The public identifier starts with: "-//IETF//DTD HTML Strict
Level 3//"
+ The public identifier starts with: "-//IETF//DTD HTML
Strict//"
+ The public identifier starts with: "-//IETF//DTD HTML//"
+ The public identifier starts with: "-//Metrius//DTD Metrius
Presentational//"
+ The public identifier starts with: "-//Microsoft//DTD Internet
Explorer 2.0 HTML Strict//"
+ The public identifier starts with: "-//Microsoft//DTD Internet
Explorer 2.0 HTML//"
+ The public identifier starts with: "-//Microsoft//DTD Internet
Explorer 2.0 Tables//"
+ The public identifier starts with: "-//Microsoft//DTD Internet
Explorer 3.0 HTML Strict//"
+ The public identifier starts with: "-//Microsoft//DTD Internet
Explorer 3.0 HTML//"
+ The public identifier starts with: "-//Microsoft//DTD Internet
Explorer 3.0 Tables//"
+ The public identifier starts with: "-//Netscape Comm.
Corp.//DTD HTML//"
+ The public identifier starts with: "-//Netscape Comm.
Corp.//DTD Strict HTML//"
+ The public identifier starts with: "-//O'Reilly and
Associates//DTD HTML 2.0//"
+ The public identifier starts with: "-//O'Reilly and
Associates//DTD HTML Extended 1.0//"
+ The public identifier starts with: "-//O'Reilly and
Associates//DTD HTML Extended Relaxed 1.0//"
+ The public identifier starts with: "-//SoftQuad Software//DTD
HoTMetaL PRO 6.0::19990601::extensions to HTML 4.0//"
+ The public identifier starts with: "-//SoftQuad//DTD HoTMetaL
PRO 4.0::19971010::extensions to HTML 4.0//"
+ The public identifier starts with: "-//Spyglass//DTD HTML 2.0
Extended//"
+ The public identifier starts with: "-//SQ//DTD HTML 2.0
HoTMetaL + extensions//"
+ The public identifier starts with: "-//Sun Microsystems
Corp.//DTD HotJava HTML//"
+ The public identifier starts with: "-//Sun Microsystems
Corp.//DTD HotJava Strict HTML//"
+ The public identifier starts with: "-//W3C//DTD HTML 3
1995-03-24//"
+ The public identifier starts with: "-//W3C//DTD HTML 3.2
Draft//"
+ The public identifier starts with: "-//W3C//DTD HTML 3.2
Final//"
+ The public identifier starts with: "-//W3C//DTD HTML 3.2//"
+ The public identifier starts with: "-//W3C//DTD HTML 3.2S
Draft//"
+ The public identifier starts with: "-//W3C//DTD HTML 4.0
Frameset//"
+ The public identifier starts with: "-//W3C//DTD HTML 4.0
Transitional//"
+ The public identifier starts with: "-//W3C//DTD HTML
Experimental 19960712//"
+ The public identifier starts with: "-//W3C//DTD HTML
Experimental 970421//"
+ The public identifier starts with: "-//W3C//DTD W3 HTML//"
+ The public identifier starts with: "-//W3O//DTD W3 HTML 3.0//"
+ The public identifier is set to: "-//W3O//DTD W3 HTML Strict
3.0//EN//"
+ The public identifier starts with: "-//WebTechs//DTD Mozilla
HTML 2.0//"
+ The public identifier starts with: "-//WebTechs//DTD Mozilla
HTML//"
+ The public identifier is set to: "-/W3C/DTD HTML 4.0
Transitional/EN"
+ The public identifier is set to: "HTML"
+ The system identifier is set to:
"http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd"
+ The system identifier is missing and the public identifier
starts with: "-//W3C//DTD HTML 4.01 Frameset//"
+ The system identifier is missing and the public identifier
starts with: "-//W3C//DTD HTML 4.01 Transitional//"
Otherwise, if the DOCTYPE token matches one of the conditions in
the following list, then set the document to limited quirks
mode:
+ The public identifier starts with: "-//W3C//DTD XHTML 1.0
Frameset//"
+ The public identifier starts with: "-//W3C//DTD XHTML 1.0
Transitional//"
+ The system identifier is not missing and the public identifier
starts with: "-//W3C//DTD HTML 4.01 Frameset//"
+ The system identifier is not missing and the public identifier
starts with: "-//W3C//DTD HTML 4.01 Transitional//"
The name, system identifier, and public identifier strings must
be compared to the values given in the lists above in an ASCII
case-insensitive manner. A system identifier whose value is the
empty string is not considered missing for the purposes of the
conditions above.
Then, switch the insertion mode to "before html".
Anything else
Parse error.
Set the document to quirks mode.
Switch the insertion mode to "before html", then reprocess the
current token.
8.2.5.5 The "before html" insertion mode
When the insertion mode is "before html", tokens must be handled as
follows:
A DOCTYPE token
Parse error. Ignore the token.
A comment token
Append a Comment node to the Document object with the data
attribute set to the data given in the comment token.
A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000C FORM FEED (FF), or U+0020 SPACE
Ignore the token.
A start tag whose tag name is "html"
Create an element for the token in the HTML namespace. Append it
to the Document object. Put this element in the stack of open
elements.
If the token has an attribute "manifest", then resolve the value
of that attribute to an absolute URL, and if that is successful,
run the application cache selection algorithm with the resulting
absolute URL. Otherwise, if there is no such attribute or
resolving it fails, run the application cache selection
algorithm with no manifest. The algorithm must be passed the
Document object.
Switch the insertion mode to "before head".
Anything else
Create an HTMLElement node with the tag name html, in the HTML
namespace. Append it to the Document object. Put this element in
the stack of open elements.
Run the application cache selection algorithm with no manifest,
passing it the Document object.
Switch the insertion mode to "before head", then reprocess the
current token.
Should probably make end tags be ignored, so that "</head><!--
--><html>" puts the comment before the root node (or should we?)
The root element can end up being removed from the Document 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.
8.2.5.6 The "before head" insertion mode
When the insertion mode is "before head", tokens must be handled as
follows:
A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000C FORM FEED (FF), or U+0020 SPACE
Ignore the token.
A comment token
Append a Comment node to the current node with the data
attribute set to the data given in the comment token.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion
mode.
A start tag whose tag name is "head"
Insert an HTML element for the token.
Set the head element pointer to the newly created head element.
Switch the insertion mode to "in head".
An end tag whose tag name is one of: "head", "br"
Act as if a start tag token with the tag name "head" and no
attributes had been seen, then reprocess the current token.
Any other end tag
Parse error. Ignore the token.
Anything else
Act as if a start tag token with the tag name "head" and no
attributes had been seen, then reprocess the current token.
This will result in an empty head element being generated, with
the current token being reprocessed in the "after head"
insertion mode.
8.2.5.7 The "in head" insertion mode
When the insertion mode is "in head", tokens must be handled as
follows:
A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000C FORM FEED (FF), or U+0020 SPACE
Insert the character into the current node.
A comment token
Append a Comment node to the current node with the data
attribute set to the data given in the comment token.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion
mode.
A start tag whose tag name is one of: "base", "command", "eventsource",
"link"
Insert an HTML element for the token. Immediately pop the
current node off the stack of open elements.
Acknowledge the token's self-closing flag, if it is set.
A start tag whose tag name is "meta"
Insert an HTML element for the token. Immediately pop the
current node off the stack of open elements.
Acknowledge the token's self-closing flag, if it is set.
If the element has a charset attribute, and its value is a
supported encoding, and the confidence is currently tentative,
then change the encoding to the encoding given by the value of
the charset attribute.
Otherwise, if the element has a content attribute, and applying
the algorithm for extracting an encoding from a Content-Type to
its value returns a supported encoding encoding, and the
confidence is currently tentative, then change the encoding to
the encoding encoding.
A start tag whose tag name is "title"
Follow the generic RCDATA element parsing algorithm.
A start tag whose tag name is "noscript", if the scripting flag is
enabled
A start tag whose tag name is one of: "noframes", "style"
Follow the generic CDATA element parsing algorithm.
A start tag whose tag name is "noscript", if the scripting flag is
disabled
Insert an HTML element for the token.
Switch the insertion mode to "in head noscript".
A start tag whose tag name is "script"
1. Create an element for the token in the HTML namespace.
2. Mark the element as being "parser-inserted".
This ensures that, if the script is external, any
document.write() calls in the script will execute in-line,
instead of blowing the document away, as would happen in most
other cases. It also prevents the script from executing until
the end tag is seen.
3. If the parser was originally created for the HTML fragment
parsing algorithm, then mark the script element as "already
executed". (fragment case)
4. Append the new element to the current node.
5. Switch the tokeniser's content model flag to the CDATA state.
6. Let the original insertion mode be the current insertion mode.
7. Switch the insertion mode to "in CDATA/RCDATA".
An end tag whose tag name is "head"
Pop the current node (which will be the head element) off the
stack of open elements.
Switch the insertion mode to "after head".
An end tag whose tag name is "br"
Act as described in the "anything else" entry below.
A start tag whose tag name is "head"
Any other end tag
Parse error. Ignore the token.
Anything else
Act as if an end tag token with the tag name "head" had been
seen, and reprocess the current token.
In certain UAs, some elements don't trigger the "in body" mode
straight away, but instead get put into the head. Do we want to
copy that?
8.2.5.8 The "in head noscript" insertion mode
When the insertion mode is "in head noscript", tokens must be handled
as follows:
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion
mode.
An end tag whose tag name is "noscript"
Pop the current node (which will be a noscript element) from the
stack of open elements; the new current node will be a head
element.
Switch the insertion mode to "in head".
A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000C FORM FEED (FF), or U+0020 SPACE
A comment token
A start tag whose tag name is one of: "link", "meta", "noframes",
"style"
Process the token using the rules for the "in head" insertion
mode.
An end tag whose tag name is "br"
Act as described in the "anything else" entry below.
A start tag whose tag name is one of: "head", "noscript"
Any other end tag
Parse error. Ignore the token.
Anything else
Parse error. Act as if an end tag with the tag name "noscript"
had been seen and reprocess the current token.
8.2.5.9 The "after head" insertion mode
When the insertion mode is "after head", tokens must be handled as
follows:
A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000C FORM FEED (FF), or U+0020 SPACE
Insert the character into the current node.
A comment token
Append a Comment node to the current node with the data
attribute set to the data given in the comment token.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion
mode.
A start tag whose tag name is "body"
Insert an HTML element for the token.
Switch the insertion mode to "in body".
A start tag whose tag name is "frameset"
Insert an HTML element for the token.
Switch the insertion mode to "in frameset".
A start tag token whose tag name is one of: "base", "link", "meta",
"noframes", "script", "style", "title"
Parse error.
Push the node pointed to by the head element pointer onto the
stack of open elements.
Process the token using the rules for the "in head" insertion
mode.
Remove the node pointed to by the head element pointer from the
stack of open elements.
An end tag whose tag name is "br"
Act as described in the "anything else" entry below.
A start tag whose tag name is "head"
Any other end tag
Parse error. Ignore the token.
Anything else
Act as if a start tag token with the tag name "body" and no
attributes had been seen, and then reprocess the current token.
8.2.5.10 The "in body" insertion mode
When the insertion mode is "in body", tokens must be handled as
follows:
A character token
Reconstruct the active formatting elements, if any.
Insert the token's character into the current node.
A comment token
Append a Comment node to the current node with the data
attribute set to the data given in the comment token.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Parse error. For each attribute on the token, check to see if
the attribute is already present on the top element of the stack
of open elements. If it is not, add the attribute and its
corresponding value to that element.
A start tag token whose tag name is one of: "base", "command",
"eventsource", "link", "meta", "noframes", "script", "style",
"title"
Process the token using the rules for the "in head" insertion
mode.
A start tag whose tag name is "body"
Parse error.
If the second element on the stack of open elements is not a
body element, or, if the stack of open elements has only one
node on it, then ignore the token. (fragment case)
Otherwise, for each attribute on the token, check to see if the
attribute is already present on the body element (the second
element) on the stack of open elements. If it is not, add the
attribute and its corresponding value to that element.
An end-of-file token
If there is a node in the stack of open elements that is not
either a dd element, a dt element, an li element, a p element, a
tbody element, a td element, a tfoot element, a th element, a
thead element, a tr element, the body element, or the html
element, then this is a parse error.
Stop parsing.
An end tag whose tag name is "body"
If the stack of open elements does not have a body element in
scope, this is a parse error; ignore the token.
Otherwise, if there is a node in the stack of open elements that
is not either a dd element, a dt element, an li element, a p
element, a tbody element, a td element, a tfoot element, a th
element, a thead element, a tr element, the body element, or the
html element, then this is a parse error.
Switch the insertion mode to "after body".
An end tag whose tag name is "html"
Act as if an end tag with tag name "body" had been seen, then,
if that token wasn't ignored, reprocess the current token.
The fake end tag token here can only be ignored in the fragment
case.
A start tag whose tag name is one of: "address", "article", "aside",
"blockquote", "center", "datagrid", "details", "dialog", "dir",
"div", "dl", "fieldset", "figure", "footer", "header", "menu",
"nav", "ol", "p", "section", "ul"
If the stack of open elements has a p element in scope, then act
as if an end tag with the tag name "p" had been seen.
Insert an HTML element for the token.
A start tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5",
"h6"
If the stack of open elements has a p element in scope, then act
as if an end tag with the tag name "p" had been seen.
If the current node is an element whose tag name is one of "h1",
"h2", "h3", "h4", "h5", or "h6", then this is a parse error; pop
the current node off the stack of open elements.
Insert an HTML element for the token.
A start tag whose tag name is one of: "pre", "listing"
If the stack of open elements has a p element in scope, then act
as if an end tag with the tag name "p" had been seen.
Insert an HTML element for the token.
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 pre blocks are ignored as an authoring
convenience.)
A start tag whose tag name is "form"
If the form element pointer is not null, then this is a parse
error; ignore the token.
Otherwise:
If the stack of open elements has a p element in scope, then act
as if an end tag with the tag name "p" had been seen.
Insert an HTML element for the token, and set the form element
pointer to point to the element created.
A start tag whose tag name is "li"
Run the following algorithm:
1. Initialize node to be the current node (the bottommost node of
the stack).
2. If node is an li element, then act as if an end tag with the
tag name "li" had been seen, then jump to the last step.
3. If node is not in the formatting category, and is not in the
phrasing category, and is not an address, div, or p element,
then jump to the last step.
4. Otherwise, set node to the previous entry in the stack of open
elements and return to step 2.
5. This is the last step.
If the stack of open elements has a p element in scope, then
act as if an end tag with the tag name "p" had been seen.
Finally, insert an HTML element for the token.
A start tag whose tag name is one of: "dd", "dt"
Run the following algorithm:
1. Initialize node to be the current node (the bottommost node of
the stack).
2. If node is a dd or dt element, then act as if an end tag with
the same tag name as node had been seen, then jump to the last
step.
3. If node is not in the formatting category, and is not in the
phrasing category, and is not an address, div, or p element,
then jump to the last step.
4. Otherwise, set node to the previous entry in the stack of open
elements and return to step 2.
5. This is the last step.
If the stack of open elements has a p element in scope, then
act as if an end tag with the tag name "p" had been seen.
Finally, insert an HTML element for the token.
A start tag whose tag name is "plaintext"
If the stack of open elements has a p element in scope, then act
as if an end tag with the tag name "p" had been seen.
Insert an HTML element for the token.
Switch the content model flag to the PLAINTEXT state.
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 content model flag out of the PLAINTEXT state.
An end tag whose tag name is one of: "address", "article", "aside",
"blockquote", "center", "datagrid", "details", "dialog", "dir",
"div", "dl", "fieldset", "figure", "footer", "header",
"listing", "menu", "nav", "ol", "pre", "section", "ul"
If the stack of open elements does not have an element in scope
with the same tag name as that of the token, then this is a
parse error; ignore the token.
Otherwise, run these steps:
1. Generate implied end tags.
2. If the current node is not an element with the same tag name
as that of the token, then this is a parse error.
3. Pop elements from the stack of open elements until an element
with the same tag name as the token has been popped from the
stack.
An end tag whose tag name is "form"
Let node be the element that the form element pointer is set to.
Set the form element pointer to null.
If node is null or the stack of open elements does not have node
in scope, then this is a parse error; ignore the token.
Otherwise, run these steps:
1. Generate implied end tags.
2. If the current node is not node, then this is a parse error.
3. Remove node from the stack of open elements.
An end tag whose tag name is "p"
If the stack of open elements does not have an element in scope
with the same tag name as that of the token, then this is a
parse error; act as if a start tag with the tag name p had been
seen, then reprocess the current token.
Otherwise, run these steps:
1. Generate implied end tags, except for elements with the same
tag name as the token.
2. If the current node is not an element with the same tag name
as that of the token, then this is a parse error.
3. Pop elements from the stack of open elements until an element
with the same tag name as the token has been popped from the
stack.
An end tag whose tag name is one of: "dd", "dt", "li"
If the stack of open elements does not have an element in scope
with the same tag name as that of the token, then this is a
parse error; ignore the token.
Otherwise, run these steps:
1. Generate implied end tags, except for elements with the same
tag name as the token.
2. If the current node is not an element with the same tag name
as that of the token, then this is a parse error.
3. Pop elements from the stack of open elements until an element
with the same tag name as the token has been popped from the
stack.
An end tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5", "h6"
If the stack of open elements does not have an element in scope
whose tag name is one of "h1", "h2", "h3", "h4", "h5", or "h6",
then this is a parse error; ignore the token.
Otherwise, run these steps:
1. Generate implied end tags.
2. If the current node is not an element with the same tag name
as that of the token, then this is a parse error.
3. Pop elements from the stack of open elements until an element
whose tag name is one of "h1", "h2", "h3", "h4", "h5", or "h6"
has been popped from the stack.
An end tag whose tag name is "sarcasm"
Take a deep breath, then act as described in the "any other end
tag" entry below.
A start tag whose tag name is "a"
If the list of active formatting elements 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 parse error; act as if an
end tag with the tag name "a" had been seen, then remove that
element from the list of active formatting elements and the
stack of open elements if the end tag didn't already remove it
(it might not have if the element is not in table scope).
In the non-conforming stream
<a href="a">a<table><a href="b">b</table>x, the first a 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 a element is not in table scope
(meaning that a regular </a> end tag at the start of the table
wouldn't close the outer a element).
Reconstruct the active formatting elements, if any.
Insert an HTML element for the token. Add that element to the
list of active formatting elements.
A start tag whose tag name is one of: "b", "big", "em", "font", "i",
"s", "small", "strike", "strong", "tt", "u"
Reconstruct the active formatting elements, if any.
Insert an HTML element for the token. Add that element to the
list of active formatting elements.
A start tag whose tag name is "nobr"
Reconstruct the active formatting elements, if any.
If the stack of open elements has a nobr element in scope, then
this is a parse error; act as if an end tag with the tag name
"nobr" had been seen, then once again reconstruct the active
formatting elements, if any.
Insert an HTML element for the token. Add that element to the
list of active formatting elements.
An end tag whose tag name is one of: "a", "b", "big", "em", "font",
"i", "nobr", "s", "small", "strike", "strong", "tt", "u"
Follow these steps:
1. Let the formatting element be the last element in the list of
active formatting elements that:
o 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
o has the same tag name as the token.
If there is no such node, or, if that node is also in the
stack of open elements but the element is not in scope, then
this is a parse error; ignore the token, and abort these
steps.
Otherwise, if there is such a node, but that node is not in
the stack of open elements, then this is a parse error; remove
the element from the list, and abort these steps.
Otherwise, there is a formatting element and that element is
in the stack and is in scope. If the element is not the
current node, this is a parse error. In any case, proceed with
the algorithm as written in the following steps.
2. Let the furthest block be the topmost node in the stack of
open elements that is lower in the stack than the formatting
element, and is not an element in the phrasing or formatting
categories. There might not be one.
3. If there is no furthest block, then the UA must skip the
subsequent steps and instead just pop all the nodes from the
bottom of the stack of open elements, from the current node up
to and including the formatting element, and remove the
formatting element from the list of active formatting
elements.
4. Let the common ancestor be the element immediately above the
formatting element in the stack of open elements.
5. If the furthest block has a parent node, then remove the
furthest block from its parent node.
6. Let a bookmark note the position of the formatting element in
the list of active formatting elements relative to the
elements on either side of it in the list.
7. Let node and last node be the furthest block. Follow these
steps:
1. Let node be the element immediately above node in the
stack of open elements.
2. If node is not in the list of active formatting elements,
then remove node from the stack of open elements and then
go back to step 1.
3. Otherwise, if node is the formatting element, then go to
the next step in the overall algorithm.
4. Otherwise, if last node is the furthest block, then move
the aforementioned bookmark to be immediately after the
node in the list of active formatting elements.
5. If node has any children, perform a shallow clone of
node, replace the entry for node in the list of active
formatting elements with an entry for the clone, replace
the entry for node in the stack of open elements with an
entry for the clone, and let node be the clone.
6. Insert last node into node, first removing it from its
previous parent node if any.
7. Let last node be node.
8. Return to step 1 of this inner set of steps.
8. If the common ancestor node is a table, tbody, tfoot, thead,
or tr element, then, foster parent whatever last node ended up
being in the previous step.
Otherwise, append whatever last node ended up being in the
previous step to the common ancestor node, first removing it
from its previous parent node if any.
9. Perform a shallow clone of the formatting element.
10. Take all of the child nodes of the furthest block and append
them to the clone created in the last step.
11. Append that clone to the furthest block.
12. Remove the formatting element from the list of active
formatting elements, and insert the clone into the list of
active formatting elements at the position of the
aforementioned bookmark.
13. Remove the formatting element from the stack of open elements,
and insert the clone into the stack of open elements
immediately below the position of the furthest block in that
stack.
14. Jump back to step 1 in this series of steps.
The way these steps are defined, only elements in the formatting
category ever get cloned by this algorithm.
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").
A start tag whose tag name is "button"
If the stack of open elements has a button element in scope,
then this is a parse error; act as if an end tag with the tag
name "button" had been seen, then reprocess the token.
Otherwise:
Reconstruct the active formatting elements, if any.
Insert an HTML element for the token.
Insert a marker at the end of the list of active formatting
elements.
A start tag token whose tag name is one of: "applet", "marquee",
"object"
Reconstruct the active formatting elements, if any.
Insert an HTML element for the token.
Insert a marker at the end of the list of active formatting
elements.
An end tag token whose tag name is one of: "applet", "button",
"marquee", "object"
If the stack of open elements does not have an element in scope
with the same tag name as that of the token, then this is a
parse error; ignore the token.
Otherwise, run these steps:
1. Generate implied end tags.
2. If the current node is not an element with the same tag name
as that of the token, then this is a parse error.
3. Pop elements from the stack of open elements until an element
with the same tag name as the token has been popped from the
stack.
4. Clear the list of active formatting elements up to the last
marker.
A start tag whose tag name is "xmp"
Reconstruct the active formatting elements, if any.
Follow the generic CDATA element parsing algorithm.
A start tag whose tag name is "table"
If the stack of open elements has a p element in scope, then act
as if an end tag with the tag name "p" had been seen.
Insert an HTML element for the token.
Switch the insertion mode to "in table".
A start tag whose tag name is one of: "area", "basefont", "bgsound",
"br", "embed", "img", "input", "spacer", "wbr"
Reconstruct the active formatting elements, if any.
Insert an HTML element for the token. Immediately pop the
current node off the stack of open elements.
Acknowledge the token's self-closing flag, if it is set.
A start tag whose tag name is one of: "param", "source"
Insert an HTML element for the token. Immediately pop the
current node off the stack of open elements.
Acknowledge the token's self-closing flag, if it is set.
A start tag whose tag name is "hr"
If the stack of open elements has a p element in scope, then act
as if an end tag with the tag name "p" had been seen.
Insert an HTML element for the token. Immediately pop the
current node off the stack of open elements.
Acknowledge the token's self-closing flag, if it is set.
A start tag whose tag name is "image"
Parse error. Change the token's tag name to "img" and reprocess
it. (Don't ask.)
A start tag whose tag name is "isindex"
Parse error.
If the form element pointer is not null, then ignore the token.
Otherwise:
Acknowledge the token's self-closing flag, if it is set.
Act as if a start tag token with the tag name "form" had been
seen.
If the token has an attribute called "action", set the action
attribute on the resulting form element to the value of the
"action" attribute of the token.
Act as if a start tag token with the tag name "hr" had been
seen.
Act as if a start tag token with the tag name "p" had been seen.
Act as if a start tag token with the tag name "label" had been
seen.
Act as if a stream of character tokens had been seen (see below
for what they should say).
Act as if a start tag token with the tag name "input" had been
seen, with all the attributes from the "isindex" token except
"name", "action", and "prompt". Set the name attribute of the
resulting input element to the value "isindex".
Act as if a stream of character tokens had been seen (see below
for what they should say).
Act as if an end tag token with the tag name "label" had been
seen.
Act as if an end tag token with the tag name "p" had been seen.
Act as if a start tag token with the tag name "hr" had been
seen.
Act as if an end tag token with the tag name "form" had been
seen.
If the token has an attribute with the name "prompt", then the
first stream of characters must be the same string as given in
that attribute, and the second stream of characters must be
empty. Otherwise, the two streams of character tokens together
should, together with the input element, express the equivalent
of "This is a searchable index. Insert your search keywords
here: (input field)" in the user's preferred language.
A start tag whose tag name is "textarea"
1. Insert an HTML element for the token.
2. 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 textarea elements are ignored as an authoring
convenience.)
3. Switch the tokeniser's content model flag to the RCDATA state.
4. Let the original insertion mode be the current insertion mode.
5. Switch the insertion mode to "in CDATA/RCDATA".
A start tag whose tag name is one of: "iframe", "noembed"
A start tag whose tag name is "noscript", if the scripting flag is
enabled
Follow the generic CDATA element parsing algorithm.
A start tag whose tag name is "select"
Reconstruct the active formatting elements, if any.
Insert an HTML element for the token.
If the insertion mode is one of in table", "in caption", "in
column group", "in table body", "in row", or "in cell", then
switch the insertion mode to "in select in table". Otherwise,
switch the insertion mode to "in select".
A start tag whose tag name is one of: "optgroup", "option"
If the stack of open elements has an option element in scope,
then act as if an end tag with the tag name "option" had been
seen.
Reconstruct the active formatting elements, if any.
Insert an HTML element for the token.
A start tag whose tag name is one of: "rp", "rt"
If the stack of open elements has a ruby element in scope, then
generate implied end tags. If the current node is not then a
ruby element, this is a parse error; pop all the nodes from the
current node up to the node immediately before the bottommost
ruby element on the stack of open elements.
Insert an HTML element for the token.
An end tag whose tag name is "br"
Parse error. Act as if a start tag token with the tag name "br"
had been seen. Ignore the end tag token.
A start tag whose tag name is "math"
Reconstruct the active formatting elements, if any.
Adjust MathML attributes for the token. (This fixes the case of
MathML attributes that are not all lowercase.)
Adjust foreign attributes for the token. (This fixes the use of
namespaced attributes, in particular XLink.)
Insert a foreign element for the token, in the MathML namespace.
If the token has its self-closing flag set, pop the current node
off the stack of open elements and acknowledge the token's
self-closing flag.
Otherwise, let the secondary insertion mode be the current
insertion mode, and then switch the insertion mode to "in
foreign content".
A start tag whose tag name is one of: "caption", "col", "colgroup",
"frame", "frameset", "head", "tbody", "td", "tfoot", "th",
"thead", "tr"
Parse error. Ignore the token.
Any other start tag
Reconstruct the active formatting elements, if any.
Insert an HTML element for the token.
This element will be a phrasing element.
Any other end tag
Run the following steps:
1. Initialize node to be the current node (the bottommost node of
the stack).
2. If node has the same tag name as the end tag token, then:
1. Generate implied end tags.
2. If the tag name of the end tag token does not match the
tag name of the current node, this is a parse error.
3. Pop all the nodes from the current node up to node,
including node, then stop these steps.
3. Otherwise, if node is in neither the formatting category nor
the phrasing category, then this is a parse error; ignore the
token, and abort these steps.
4. Set node to the previous entry in the stack of open elements.
5. Return to step 2.
8.2.5.11 The "in CDATA/RCDATA" insertion mode
When the insertion mode is "in CDATA/RCDATA", tokens must be handled as
follows:
A character token
Insert the token's character into the current node.
An end-of-file token
Parse error.
If the current node is a script element, mark the script element
as "already executed".
Pop the current node off the stack of open elements.
Switch the insertion mode to the original insertion mode and
reprocess the current token.
An end tag whose tag name is "script"
Let script be the current node (which will be a script element).
Pop the current node off the stack of open elements.
Switch the insertion mode to the original insertion mode.
Let the old insertion point have the same value as the current
insertion point. Let the insertion point be just before the next
input character.
Increment the parser's script nesting level by one.
Run the script. This might cause some script to execute, which
might cause new characters to be inserted into the tokeniser,
and might cause the tokeniser to output more tokens, resulting
in a reentrant invocation of the parser.
Decrement the parser's script nesting level by one. If the
parser's script nesting level is zero, then set the parser pause
flag to false.
Let the insertion point have the value of the old insertion
point. (In other words, restore the insertion point to the value
it had before the previous paragraph. This value might be the
"undefined" value.)
At this stage, if there is a pending external script, then:
If the tree construction stage is being called reentrantly, say
from a call to document.write():
Set the parser pause flag to true, and abort the
processing of any nested invocations of the tokeniser,
yielding control back to the caller. (Tokenization will
resume when the caller returns to the "outer" tree
construction stage.)
Otherwise:
Follow these steps:
1. Let the script be the pending external script. There is
no longer a pending external script.
2. Pause until the script has completed loading.
3. Let the insertion point be just before the next input
character.
4. Execute the script.
5. Let the insertion point be undefined again.
6. If there is once again a pending external script, then
repeat these steps from step 1.
Any other end tag
Pop the current node off the stack of open elements.
Switch the insertion mode to the original insertion mode.
8.2.5.12 The "in table" insertion mode
When the insertion mode is "in table", tokens must be handled as
follows:
A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000C FORM FEED (FF), or U+0020 SPACE
If the current table is tainted, then act as described in the
"anything else" entry below.
Otherwise, insert the character into the current node.
A comment token
Append a Comment node to the current node with the data
attribute set to the data given in the comment token.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "caption"
Clear the stack back to a table context. (See below.)
Insert a marker at the end of the list of active formatting
elements.
Insert an HTML element for the token, then switch the insertion
mode to "in caption".
A start tag whose tag name is "colgroup"
Clear the stack back to a table context. (See below.)
Insert an HTML element for the token, then switch the insertion
mode to "in column group".
A start tag whose tag name is "col"
Act as if a start tag token with the tag name "colgroup" had
been seen, then reprocess the current token.
A start tag whose tag name is one of: "tbody", "tfoot", "thead"
Clear the stack back to a table context. (See below.)
Insert an HTML element for the token, then switch the insertion
mode to "in table body".
A start tag whose tag name is one of: "td", "th", "tr"
Act as if a start tag token with the tag name "tbody" had been
seen, then reprocess the current token.
A start tag whose tag name is "table"
Parse error. 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.
The fake end tag token here can only be ignored in the fragment
case.
An end tag whose tag name is "table"
If the stack of open elements does not have an element in table
scope with the same tag name as the token, this is a parse
error. Ignore the token. (fragment case)
Otherwise:
Pop elements from this stack until a table element has been
popped from the stack.
Reset the insertion mode appropriately.
An end tag whose tag name is one of: "body", "caption", "col",
"colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr"
Parse error. Ignore the token.
A start tag whose tag name is one of: "style", "script"
If the current table is tainted then act as described in the
"anything else" entry below.
Otherwise, process the token using the rules for the "in head"
insertion mode.
A start tag whose tag name is "input"
If the token does not have an attribute with the name "type", or
if it does, but that attribute's value is not an ASCII
case-insensitive match for the string "hidden", or, if the
current table is tainted, then: act as described in the
"anything else" entry below.
Otherwise:
Parse error.
Insert an HTML element for the token.
Pop that input element off the stack of open elements.
An end-of-file token
If the current node is not the root html element, then this is a
parse error.
It can only be the current node in the fragment case.
Stop parsing.
Anything else
Parse error. Process the token using the rules for the "in body"
insertion mode, except that if the current node is a table,
tbody, tfoot, thead, or tr element, then, whenever a node would
be inserted into the current node, it must instead be foster
parented.
When the steps above require the UA to clear the stack back to a table
context, it means that the UA must, while the current node is not a
table element or an html element, pop elements from the stack of open
elements.
The current node being an html element after this process is a fragment
case.
8.2.5.13 The "in caption" insertion mode
When the insertion mode is "in caption", tokens must be handled as
follows:
An end tag whose tag name is "caption"
If the stack of open elements does not have an element in table
scope with the same tag name as the token, this is a parse
error. Ignore the token. (fragment case)
Otherwise:
Generate implied end tags.
Now, if the current node is not a caption element, then this is
a parse error.
Pop elements from this stack until a caption element has been
popped from the stack.
Clear the list of active formatting elements up to the last
marker.
Switch the insertion mode to "in table".
A start tag whose tag name is one of: "caption", "col", "colgroup",
"tbody", "td", "tfoot", "th", "thead", "tr"
An end tag whose tag name is "table"
Parse error. 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.
The fake end tag token here can only be ignored in the fragment
case.
An end tag whose tag name is one of: "body", "col", "colgroup", "html",
"tbody", "td", "tfoot", "th", "thead", "tr"
Parse error. Ignore the token.
Anything else
Process the token using the rules for the "in body" insertion
mode.
8.2.5.14 The "in column group" insertion mode
When the insertion mode is "in column group", tokens must be handled as
follows:
A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000C FORM FEED (FF), or U+0020 SPACE
Insert the character into the current node.
A comment token
Append a Comment node to the current node with the data
attribute set to the data given in the comment token.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion
mode.
A start tag whose tag name is "col"
Insert an HTML element for the token. Immediately pop the
current node off the stack of open elements.
Acknowledge the token's self-closing flag, if it is set.
An end tag whose tag name is "colgroup"
If the current node is the root html element, then this is a
parse error; ignore the token. (fragment case)
Otherwise, pop the current node (which will be a colgroup
element) from the stack of open elements. Switch the insertion
mode to "in table".
An end tag whose tag name is "col"
Parse error. Ignore the token.
An end-of-file token
If the current node is the root html element, then stop parsing.
(fragment case)
Otherwise, act as described in the "anything else" entry below.
Anything else
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.
The fake end tag token here can only be ignored in the fragment
case.
8.2.5.15 The "in table body" insertion mode
When the insertion mode is "in table body", tokens must be handled as
follows:
A start tag whose tag name is "tr"
Clear the stack back to a table body context. (See below.)
Insert an HTML element for the token, then switch the insertion
mode to "in row".
A start tag whose tag name is one of: "th", "td"
Parse error. Act as if a start tag with the tag name "tr" had
been seen, then reprocess the current token.
An end tag whose tag name is one of: "tbody", "tfoot", "thead"
If the stack of open elements does not have an element in table
scope with the same tag name as the token, this is a parse
error. Ignore the token.
Otherwise:
Clear the stack back to a table body context. (See below.)
Pop the current node from the stack of open elements. Switch the
insertion mode to "in table".
A start tag whose tag name is one of: "caption", "col", "colgroup",
"tbody", "tfoot", "thead"
An end tag whose tag name is "table"
If the stack of open elements does not have a tbody, thead, or
tfoot element in table scope, this is a parse error. Ignore the
token. (fragment case)
Otherwise:
Clear the stack back to a table body context. (See below.)
Act as if an end tag with the same tag name as the current node
("tbody", "tfoot", or "thead") had been seen, then reprocess the
current token.
An end tag whose tag name is one of: "body", "caption", "col",
"colgroup", "html", "td", "th", "tr"
Parse error. Ignore the token.
Anything else
Process the token using the rules for the "in table" insertion
mode.
When the steps above require the UA to clear the stack back to a table
body context, it means that the UA must, while the current node is not
a tbody, tfoot, thead, or html element, pop elements from the stack of
open elements.
The current node being an html element after this process is a fragment
case.
8.2.5.16 The "in row" insertion mode
When the insertion mode is "in row", tokens must be handled as follows:
A start tag whose tag name is one of: "th", "td"
Clear the stack back to a table row context. (See below.)
Insert an HTML element for the token, then switch the insertion
mode to "in cell".
Insert a marker at the end of the list of active formatting
elements.
An end tag whose tag name is "tr"
If the stack of open elements does not have an element in table
scope with the same tag name as the token, this is a parse
error. Ignore the token. (fragment case)
Otherwise:
Clear the stack back to a table row context. (See below.)
Pop the current node (which will be a tr element) from the stack
of open elements. Switch the insertion mode to "in table body".
A start tag whose tag name is one of: "caption", "col", "colgroup",
"tbody", "tfoot", "thead", "tr"
An end tag whose tag name is "table"
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.
The fake end tag token here can only be ignored in the fragment
case.
An end tag whose tag name is one of: "tbody", "tfoot", "thead"
If the stack of open elements does not have an element in table
scope with the same tag name as the token, this is a parse
error. Ignore the token.
Otherwise, act as if an end tag with the tag name "tr" had been
seen, then reprocess the current token.
An end tag whose tag name is one of: "body", "caption", "col",
"colgroup", "html", "td", "th"
Parse error. Ignore the token.
Anything else
Process the token using the rules for the "in table" insertion
mode.
When the steps above require the UA to clear the stack back to a table
row context, it means that the UA must, while the current node is not a
tr element or an html element, pop elements from the stack of open
elements.
The current node being an html element after this process is a fragment
case.
8.2.5.17 The "in cell" insertion mode
When the insertion mode is "in cell", tokens must be handled as
follows:
An end tag whose tag name is one of: "td", "th"
If the stack of open elements does not have an element in table
scope with the same tag name as that of the token, then this is
a parse error and the token must be ignored.
Otherwise:
Generate implied end tags.
Now, if the current node is not an element with the same tag
name as the token, then this is a parse error.
Pop elements from this stack until an element with the same tag
name as the token has been popped from the stack.
Clear the list of active formatting elements up to the last
marker.
Switch the insertion mode to "in row". (The current node will be
a tr element at this point.)
A start tag whose tag name is one of: "caption", "col", "colgroup",
"tbody", "td", "tfoot", "th", "thead", "tr"
If the stack of open elements does not have a td or th element
in table scope, then this is a parse error; ignore the token.
(fragment case)
Otherwise, close the cell (see below) and reprocess the current
token.
An end tag whose tag name is one of: "body", "caption", "col",
"colgroup", "html"
Parse error. Ignore the token.
An end tag whose tag name is one of: "table", "tbody", "tfoot",
"thead", "tr"
If the stack of open elements does not have an element in table
scope with the same tag name as that of the token (which can
only happen for "tbody", "tfoot" and "thead", or, in the
fragment case), then this is a parse error and the token must be
ignored.
Otherwise, close the cell (see below) and reprocess the current
token.
Anything else
Process the token using the rules for the "in body" insertion
mode.
Where the steps above say to close the cell, they mean to run the
following algorithm:
1. If the stack of open elements has a td element in table scope, then
act as if an end tag token with the tag name "td" had been seen.
2. Otherwise, the stack of open elements will have a th element in
table scope; act as if an end tag token with the tag name "th" had
been seen.
The stack of open elements cannot have both a td and a th element in
table scope at the same time, nor can it have neither when the
insertion mode is "in cell".
8.2.5.18 The "in select" insertion mode
When the insertion mode is "in select", tokens must be handled as
follows:
A character token
Insert the token's character into the current node.
A comment token
Append a Comment node to the current node with the data
attribute set to the data given in the comment token.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion
mode.
A start tag whose tag name is "option"
If the current node is an option element, act as if an end tag
with the tag name "option" had been seen.
Insert an HTML element for the token.
A start tag whose tag name is "optgroup"
If the current node is an option element, act as if an end tag
with the tag name "option" had been seen.
If the current node is an optgroup element, act as if an end tag
with the tag name "optgroup" had been seen.
Insert an HTML element for the token.
An end tag whose tag name is "optgroup"
First, if the current node is an option element, and the node
immediately before it in the stack of open elements is an
optgroup element, then act as if an end tag with the tag name
"option" had been seen.
If the current node is an optgroup element, then pop that node
from the stack of open elements. Otherwise, this is a parse
error; ignore the token.
An end tag whose tag name is "option"
If the current node is an option element, then pop that node
from the stack of open elements. Otherwise, this is a parse
error; ignore the token.
An end tag whose tag name is "select"
If the stack of open elements does not have an element in table
scope with the same tag name as the token, this is a parse
error. Ignore the token. (fragment case)
Otherwise:
Pop elements from the stack of open elements until a select
element has been popped from the stack.
Reset the insertion mode appropriately.
A start tag whose tag name is "select"
Parse error. Act as if the token had been an end tag with the
tag name "select" instead.
A start tag whose tag name is one of: "input", "textarea"
Parse error. Act as if an end tag with the tag name "select" had
been seen, and reprocess the token.
A start tag token whose tag name is "script"
Process the token using the rules for the "in head" insertion
mode.
An end-of-file token
If the current node is not the root html element, then this is a
parse error.
It can only be the current node in the fragment case.
Stop parsing.
Anything else
Parse error. Ignore the token.
8.2.5.19 The "in select in table" insertion mode
When the insertion mode is "in select in table", tokens must be handled
as follows:
A start tag whose tag name is one of: "caption", "table", "tbody",
"tfoot", "thead", "tr", "td", "th"
Parse error. Act as if an end tag with the tag name "select" had
been seen, and reprocess the token.
An end tag whose tag name is one of: "caption", "table", "tbody",
"tfoot", "thead", "tr", "td", "th"
Parse error.
If the stack of open elements has an element in table scope 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.
Anything else
Process the token using the rules for the "in select" insertion
mode.
8.2.5.20 The "in foreign content" insertion mode
When the insertion mode is "in foreign content", tokens must be handled
as follows:
A character token
Insert the token's character into the current node.
A comment token
Append a Comment node to the current node with the data
attribute set to the data given in the comment token.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is neither "mglyph" nor "malignmark", if the
current node is an mi element in the MathML namespace.
A start tag whose tag name is neither "mglyph" nor "malignmark", if the
current node is an mo element in the MathML namespace.
A start tag whose tag name is neither "mglyph" nor "malignmark", if the
current node is an mn element in the MathML namespace.
A start tag whose tag name is neither "mglyph" nor "malignmark", if the
current node is an ms element in the MathML namespace.
A start tag whose tag name is neither "mglyph" nor "malignmark", if the
current node is an mtext element in the MathML namespace.
A start tag, if the current node is an element in the HTML namespace.
An end tag
Process the token using the rules for the secondary insertion
mode.
If, after doing so, the insertion mode is still "in foreign
content", but there is no element in scope that has a namespace
other than the HTML namespace, switch the insertion mode to the
secondary insertion mode.
A start tag whose tag name is one of: "b", "big", "blockquote", "body",
"br", "center", "code", "dd", "div", "dl", "dt", "em", "embed",
"h1", "h2", "h3", "h4", "h5", "h6", "head", "hr", "i", "img",
"li", "listing", "menu", "meta", "nobr", "ol", "p", "pre",
"ruby", "s", "small", "span", "strong", "strike", "sub", "sup",
"table", "tt", "u", "ul", "var"
A start tag whose tag name is "font", if the token has any attributes
named "color", "face", or "size"
An end-of-file token
Parse error.
Pop elements from the stack of open elements until the current
node is in the HTML namespace.
Switch the insertion mode to the secondary insertion mode, and
reprocess the token.
Any other start tag
If the current node is an element in the MathML namespace,
adjust MathML attributes for the token. (This fixes the case of
MathML attributes that are not all lowercase.)
Adjust foreign attributes for the token. (This fixes the use of
namespaced attributes, in particular XLink in SVG.)
Insert a foreign element for the token, in the same namespace as
the current node.
If the token has its self-closing flag set, pop the current node
off the stack of open elements and acknowledge the token's
self-closing flag.
8.2.5.21 The "after body" insertion mode
When the insertion mode is "after body", tokens must be handled as
follows:
A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000C FORM FEED (FF), or U+0020 SPACE
Process the token using the rules for the "in body" insertion
mode.
A comment token
Append a Comment node to the first element in the stack of open
elements (the html element), with the data attribute set to the
data given in the comment token.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion
mode.
An end tag whose tag name is "html"
If the parser was originally created as part of the HTML
fragment parsing algorithm, this is a parse error; ignore the
token. (fragment case)
Otherwise, switch the insertion mode to "after after body".
An end-of-file token
Stop parsing.
Anything else
Parse error. Switch the insertion mode to "in body" and
reprocess the token.
8.2.5.22 The "in frameset" insertion mode
When the insertion mode is "in frameset", tokens must be handled as
follows:
A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000C FORM FEED (FF), or U+0020 SPACE
Insert the character into the current node.
A comment token
Append a Comment node to the current node with the data
attribute set to the data given in the comment token.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion
mode.
A start tag whose tag name is "frameset"
Insert an HTML element for the token.
An end tag whose tag name is "frameset"
If the current node is the root html element, then this is a
parse error; ignore the token. (fragment case)
Otherwise, pop the current node from the stack of open elements.
If the parser was not originally created as part of the HTML
fragment parsing algorithm (fragment case), and the current node
is no longer a frameset element, then switch the insertion mode
to "after frameset".
A start tag whose tag name is "frame"
Insert an HTML element for the token. Immediately pop the
current node off the stack of open elements.
Acknowledge the token's self-closing flag, if it is set.
A start tag whose tag name is "noframes"
Process the token using the rules for the "in head" insertion
mode.
An end-of-file token
If the current node is not the root html element, then this is a
parse error.
It can only be the current node in the fragment case.
Stop parsing.
Anything else
Parse error. Ignore the token.
8.2.5.23 The "after frameset" insertion mode
When the insertion mode is "after frameset", tokens must be handled as
follows:
A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000C FORM FEED (FF), or U+0020 SPACE
Insert the character into the current node.
A comment token
Append a Comment node to the current node with the data
attribute set to the data given in the comment token.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion
mode.
An end tag whose tag name is "html"
Switch the insertion mode to "after after frameset".
A start tag whose tag name is "noframes"
Process the token using the rules for the "in head" insertion
mode.
An end-of-file token
Stop parsing.
Anything else
Parse error. Ignore the token.
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.
8.2.5.24 The "after after body" insertion mode
When the insertion mode is "after after body", tokens must be handled
as follows:
A comment token
Append a Comment node to the Document object with the data
attribute set to the data given in the comment token.
A DOCTYPE token
A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000C FORM FEED (FF), or U+0020 SPACE
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion
mode.
An end-of-file token
Stop parsing.
Anything else
Parse error. Switch the insertion mode to "in body" and
reprocess the token.
8.2.5.25 The "after after frameset" insertion mode
When the insertion mode is "after after frameset", tokens must be
handled as follows:
A comment token
Append a Comment node to the Document object with the data
attribute set to the data given in the comment token.
A DOCTYPE token
A character token that is one of one of U+0009 CHARACTER TABULATION,
U+000A LINE FEED (LF), U+000C FORM FEED (FF), or U+0020 SPACE
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion
mode.
An end-of-file token
Stop parsing.
A start tag whose tag name is "noframes"
Process the token using the rules for the "in head" insertion
mode.
Anything else
Parse error. Ignore the token.
8.2.6 The end
Once the user agent stops parsing the document, the user agent must
follow the steps in this section.
First, the current document readiness must be set to "interactive".
Then, the rules for when a script completes loading start applying
(script execution is no longer managed by the parser).
If any of the scripts in the list of scripts that will execute as soon
as possible have completed loading, or if the list of scripts that will
execute asynchronously is not empty and the first script in that list
has completed loading, then the user agent must act as if those scripts
just completed loading, following the rules given for that in the
script element definition.
Then, if the list of scripts that will execute when the document has
finished parsing is not empty, and the first item in this list has
already completed loading, then the user agent must act as if that
script just finished loading.
By this point, there will be no scripts that have loaded but have not
yet been executed.
The user agent must then fire a simple event called DOMContentLoaded at
the Document.
Once everything that delays the load event has completed, the user
agent must set the current document readiness to "complete", and then
fire a load event at the body element.
delaying the load event for things like image loads allows for intranet
port scans (even without javascript!). Should we really encode that
into the spec?
8.2.7 Coercing an HTML DOM into an infoset
When an application uses an HTML parser in conjunction with an XML
pipeline, it is possible that the constructed DOM is not compatible
with the XML tool chain in certain subtle ways. For example, an XML
toolchain might not be able to represent attributes with the name
xmlns, since they conflict with the Namespaces in XML syntax. There is
also some data that the HTML parser generates that isn't included in
the DOM itself. This section specifies some rules for handling these
issues.
If the XML API being used doesn't support DOCTYPEs, the tool may drop
DOCTYPEs altogether.
If the XML API doesn't support attributes in no namespace that are
named "xmlns", attributes whose names start with "xmlns:", or
attributes in the XMLNS namespace, then the tool may drop such
attributes.
The tool may annotate the output with any namespace declarations
required for proper operation.
If the XML API being used restricts the allowable characters in the
local names of elements and attributes, then the tool may map all
element and attribute local names that the API wouldn't support to a
set of names that are allowed, by replacing any character that isn't
supported with the uppercase letter U and the five digits of the
character's Unicode codepoint when expressed in hexadecimal, using
digits 0-9 and capital letters A-F as the symbols, in increasing
numeric order.
For example, the element name foo<bar, which can be output by the HTML
parser, though it is neither a legal HTML element name nor a
well-formed XML element name, would be converted into fooU0003Cbar,
which is a well-formed XML element name (though it's still not legal in
HTML by any means).
As another example, consider the attribute xlink:href. Used on a MathML
element, it becomes, after being adjusted, an attribute with a prefix
"xlink" and a local name "href". However, used on an HTML element, it
becomes an attribute with no prefix and the local name "xlink:href",
which is not a valid NCName, and thus might not be accepted by an XML
API. It could thus get converted, becoming "xlinkU0003Ahref".
The resulting names from this conversion conveniently can't clash with
any attribute generated by the HTML parser, since those are all either
lowercase or those listed in the adjust foreign attributes algorithm's
table.
If the XML API restricts comments from having two consecutive U+002D
HYPHEN-MINUS characters (--), the tool may insert a single U+0020 SPACE
character between any such offending characters.
If the XML API restricts comments from ending in a U+002D HYPHEN-MINUS
character (-), the tool may insert a single U+0020 SPACE character at
the end of such comments.
If the XML API restricts allowed characters in character data, the tool
may replace any U+000C FORM FEED (FF) character with a U+0020 SPACE
character, and any other literal non-XML character with a U+FFFD
REPLACEMENT CHARACTER.
If the tool has no way to convey out-of-band information, then the tool
may drop the following information:
* Whether the document is set to no quirks mode, limited quirks mode,
or quirks mode
* The association between form controls and forms that aren't their
nearest form element ancestor (use of the form element pointer in
the parser)
The mutations allowed by this section apply after the HTML parser's
rules have been applied. For example, a <a::> start tag will be closed
by a </a::> end tag, and never by a </aU0003AU0003A> end tag, even if
the user agent is using the rules above to then generate an actual
element in the DOM with the name aU0003AU0003A for that start tag.
8.3 Namespaces
The HTML namespace is: http://www.w3.org/1999/xhtml
The MathML namespace is: http://www.w3.org/1998/Math/MathML
The SVG namespace is: http://www.w3.org/2000/svg
The XLink namespace is: http://www.w3.org/1999/xlink
The XML namespace is: http://www.w3.org/XML/1998/namespace
The XMLNS namespace is: http://www.w3.org/2000/xmlns/
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