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Editorial: make use of the Infra Standard
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annevk committed Nov 21, 2016
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Expand Up @@ -15,7 +15,7 @@ Logo: https://resources.whatwg.org/logo-dom.svg
Abstract: DOM defines a platform-neutral model for events and node trees.
Ignored Terms: EmptyString, Array, Document
Ignored Vars: p, documentFragment, ev, oldParent, em, processingInstruction, obj, tree, insertedNode, removedNode, C, *, intersects, collapsed
Boilerplate: omit conformance, omit feedback-header
Boilerplate: omit feedback-header, omit conformance
</pre>

<!--
Expand All @@ -26,13 +26,9 @@ Bikeshed problems:

<script src=https://resources.whatwg.org/file-issue.js async></script>
<script src=https://resources.whatwg.org/commit-snapshot-shortcut-key.js async></script>
<script src=https://resources.whatwg.org/dfn.js defer id=head></script>
<script src=https://resources.whatwg.org/dfn.js defer></script>

<pre class='anchors'>
urlPrefix: https://encoding.spec.whatwg.org/; spec: ENCODING
type: dfn;
text: ascii whitespace
text: utf-8
<pre class=anchors>
urlPrefix: https://www.w3.org/TR/xml/#NT-
type: type
text: Name; url: Name
Expand Down Expand Up @@ -117,79 +113,28 @@ This specification standardizes the DOM. It does so as follows:
</ol>


<h2 id=conformance>Conformance</h2>
<h2 id=infrastructure oldids=terminology,dependencies>Infrastructure</h2>

All diagrams, examples, and notes in this specification are
non-normative, as are all sections explicitly marked non-normative.
Everything else in this specification is normative.
<p>This specification depends on the Infra Standard. [[!INFRA]]

The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in RFC 2119.
For readability, these words do not appear in all uppercase letters in this
specification. [[!RFC2119]]

Requirements phrased in the imperative as part of algorithms
(such as "strip any leading space characters" or "return false and
terminate these steps") are to be interpreted with the meaning of the
keyword ("must", "should", "may", etc.) used in introducing the
algorithm.

Conformance requirements phrased as algorithms or specific steps
may be implemented in any manner, so long as the end result is
equivalent. (In particular, the algorithms defined in this
specification are intended to be easy to follow, and not intended to
be performant.)

<p id="hardwareLimitations">User agents may impose
implementation-specific limits on otherwise unconstrained inputs,
e.g. to prevent denial of service attacks, to guard against running
out of memory, or to work around platform-specific limitations.

When a method or an attribute is said to call another method or attribute, the user agent must
invoke its internal API for that attribute or method so that e.g. the author can't change the
behavior by overriding attributes or methods with custom properties or functions in JavaScript.

Unless otherwise stated, string comparisons are done in a <a>case-sensitive</a> manner.

<h3 id=dependencies>Dependencies</h3>

The IDL fragments in this specification must be interpreted as
required for conforming IDL fragments, as described in the Web IDL
specification. [[!WEBIDL]]

Some of the terms used in this specification are defined in
<cite>Encoding</cite>, <cite>Selectors</cite>, <cite>Web IDL</cite>, <cite>XML</cite>, and
<cite>Namespaces in XML</cite>.
<p>Some of the terms used in this specification are defined in <cite>Encoding</cite>,
<cite>Selectors</cite>, <cite>Web IDL</cite>, <cite>XML</cite>, and <cite>Namespaces in XML</cite>.
[[!ENCODING]]
[[!SELECTORS4]]
[[!WEBIDL]]
[[!XML]]
[[!XML-NAMES]]

<h3 id=extensibility>Extensibility</h3>

Vendor-specific proprietary extensions to this specification are
strongly discouraged. Authors must not use such extensions, as
doing so reduces interoperability and fragments the user base,
allowing only users of specific user agents to access the content in
question.
<p>The term <dfn export>context object</dfn> means the object on which the algorithm,
attribute getter, attribute setter, or method being discussed was called. When the
<a>context object</a> is unambiguous, the term can be omitted.

When extensions are needed, the DOM Standard can be updated accordingly, or a new standard
<p>When extensions are needed, the DOM Standard can be updated accordingly, or a new standard
can be written that hooks into the provided extensibility hooks for
<dfn export lt="other applicable specifications">applicable specifications</dfn>.
<!-- https://www.w3.org/mid/17E341CD-E790-422C-9F9A-69347EE01CEB@iki.fi -->


<h2 id=terminology>Terminology</h2>

The term <dfn export>context object</dfn> means the object on which the algorithm,
attribute getter, attribute setter, or method being discussed was called. When the
<a>context object</a> is unambiguous, the term can be omitted.

<!-- XXX we should prolly explain that "set attribute X to Y" works even for
readonly attributes when it is language for implementors -->

<h3 id=trees>Trees</h3> <!-- Sorry reddit, this is not /r/trees -->

A <dfn export id=concept-tree>tree</dfn> is a finite hierarchical tree structure. In
Expand Down Expand Up @@ -277,32 +222,6 @@ of <a>preceding</a>
<a for=tree>siblings</a>.


<h3 id=strings>Strings</h3>

Comparing two strings in a
<dfn export lt="case-sensitive|case-sensitively">case-sensitive</dfn> manner means
comparing them exactly, code point for code point.

Comparing two strings in a
<dfn export lt="ASCII case-insensitive|ASCII case-insensitively">ASCII case-insensitive</dfn>
manner means comparing them exactly, code point for code point, except that the characters
in the range U+0041 to U+005A (i.e. LATIN CAPITAL LETTER A to LATIN CAPITAL LETTER Z),
inclusive, and the corresponding characters in the range U+0061 to U+007A (i.e.
LATIN SMALL LETTER A to LATIN SMALL LETTER Z), inclusive, are considered to also match.

<dfn export lt="converted to ASCII uppercase">Converting a string to ASCII uppercase</dfn>
means replacing all characters in the range U+0061 to U+007A, inclusive, with the
corresponding characters in the range U+0041 to U+005A, inclusive.

<dfn export lt="converted to ASCII lowercase">Converting a string to ASCII lowercase</dfn>
means replacing all characters in the range U+0041 to U+005A, inclusive, with the
corresponding characters in the range U+0061 to U+007A, inclusive.

A string <var>pattern</var> is a <dfn export>prefix match</dfn> for a string <var>s</var>
when <var>pattern</var> is not longer than <var>s</var> and truncating <var>s</var> to
<var>pattern</var>'s length leaves the two strings as matches of each other.


<h3 id="ordered sets">Ordered sets</h3>

The <dfn export id=concept-ordered-set-parser>ordered set parser</dfn> takes a string
Expand Down Expand Up @@ -399,18 +318,6 @@ added.

<h3 id=namespaces>Namespaces</h3>

The <dfn export>HTML namespace</dfn> is
<code>http://www.w3.org/1999/xhtml</code>.

The <dfn export>SVG namespace</dfn> is
<code>http://www.w3.org/2000/svg</code>.

The <dfn export>XML namespace</dfn> is
<code>http://www.w3.org/XML/1998/namespace</code>.

The <dfn export>XMLNS namespace</dfn> is
<code>http://www.w3.org/2000/xmlns/</code>.

To <dfn export>validate</dfn> a <var>qualifiedName</var>, run these steps:

<ol>
Expand Down Expand Up @@ -4454,8 +4361,7 @@ for a <a>node</a> <var>root</var> is the {{HTMLCollection}} returned by the foll

<ul>
<li><p>Whose <a for=Element>namespace</a> is the <a>HTML namespace</a> and whose
<a for=Element>qualified name</a> is <var>qualifiedName</var>,
<a>converted to ASCII lowercase</a>.
<a for=Element>qualified name</a> is <var>qualifiedName</var>, in <a>ASCII lowercase</a>.

<li><p>Whose <a for=Element>namespace</a> is <em>not</em> the <a>HTML namespace</a> and whose
<a for=Element>qualified name</a> is <var>qualifiedName</var>.
Expand Down Expand Up @@ -4930,9 +4836,8 @@ invoked, must run these steps:
<li><p>If <var>localName</var> does not match the <code><a type>Name</a></code> production, then
<a>throw</a> an {{InvalidCharacterError}}.

<li>If the <a>context object</a> is an <a>HTML document</a>,
let <var>localName</var> be
<a>converted to ASCII lowercase</a>.
<li>If the <a>context object</a> is an <a>HTML document</a>, then set <var>localName</var> to
<var>localName</var> in <a>ASCII lowercase</a>.
<!-- XXX why restrict this to HTML documents? -->

<li>Let <var>is</var> be the value of <code>is</code> member of <var>options</var>, or null if no
Expand Down Expand Up @@ -5140,8 +5045,8 @@ invoked, must run these steps:
<li><p>If <var>localName</var> does not match the <code><a type>Name</a></code> production in XML,
then <a>throw</a> an {{InvalidCharacterError}}.

<li>If the <a>context object</a> is an <a>HTML document</a>, let
<var>localName</var> be <a>converted to ASCII lowercase</a>.
<li>If the <a>context object</a> is an <a>HTML document</a>, then set <var>localName</var> to
<var>localName</var> in <a>ASCII lowercase</a>.

<li>Return a new <a>attribute</a> whose <a for=Attr>local name</a> is <var>localName</var> and
<a for=Node>node document</a> is <a>context object</a>.
Expand Down Expand Up @@ -6031,8 +5936,9 @@ To <dfn export id=concept-element-attributes-get-by-name>get an attribute by nam
<var>qualifiedName</var> and <a for="/">element</a> <var>element</var>, run these steps:

<ol>
<li><p>If <var>element</var> is in the <a>HTML namespace</a> and its <a for=Node>node document</a> is an
<a>HTML document</a>, let <var>qualifiedName</var> be <a>converted to ASCII lowercase</a>.
<li><p>If <var>element</var> is in the <a>HTML namespace</a> and its <a for=Node>node document</a>
is an <a>HTML document</a>, then set <var>qualifiedName</var> to <var>qualifiedName</var> in
<a>ASCII lowercase</a>.

<li><p>Return the first <a>attribute</a> in <var>element</var>'s <a for=Element>attribute list</a>
whose <a for=Attr>qualified name</a> is <var>qualifiedName</var>, and null otherwise.
Expand Down Expand Up @@ -6217,8 +6123,9 @@ steps:
<ol>
<li><p>Let <var>qualifiedName</var> be <a>context object</a>'s <a for=Element>qualified name</a>.

<li><p>If the <a>context object</a> is in the <a>HTML namespace</a> and its <a for=Node>node document</a> is
an <a>HTML document</a>, let <var>qualifiedName</var> be <a>converted to ASCII uppercase</a>.
<li><p>If the <a>context object</a> is in the <a>HTML namespace</a> and its
<a for=Node>node document</a> is an <a>HTML document</a>, then set <var>qualifiedName</var> to
<var>qualifiedName</var> in <a>ASCII uppercase</a>.

<li>Return <var>qualifiedName</var>.
</ol>
Expand Down Expand Up @@ -6308,8 +6215,9 @@ method, when invoked, must run these steps:
<li><p>If <var>qualifiedName</var> does not match the <code><a type>Name</a></code> production in
XML, then <a>throw</a> an {{InvalidCharacterError}}.

<li><p>If the <a>context object</a> is in the <a>HTML namespace</a> and its <a for=Node>node document</a> is
an <a>HTML document</a>, let <var>qualifiedName</var> be <a>converted to ASCII lowercase</a>.
<li><p>If the <a>context object</a> is in the <a>HTML namespace</a> and its
<a for=Node>node document</a> is an <a>HTML document</a>, then set <var>qualifiedName</var> to
<var>qualifiedName</var> in <a>ASCII lowercase</a>.

<li><p>Let <var>attribute</var> be the first <a>attribute</a> in <a>context object</a>'s
<a for=Element>attribute list</a> whose <a for=Attr>qualified name</a> is <var>qualifiedName</var>,
Expand Down Expand Up @@ -6355,8 +6263,8 @@ when invoked, must run these steps:

<ol>
<li><p>If the <a>context object</a> is in the <a>HTML namespace</a> and its
<a for=Node>node document</a> is an <a>HTML document</a>, let <var>qualifiedName</var> be
<a>converted to ASCII lowercase</a>.
<a for=Node>node document</a> is an <a>HTML document</a>, then set <var>qualifiedName</var> to
<var>qualifiedName</var> in <a>ASCII lowercase</a>.

<li><p>Return true if the <a>context object</a> <a lt="has an attribute">has</a> an
<a>attribute</a> whose <a for=Attr>qualified name</a> is <var>qualifiedName</var>, and false
Expand Down Expand Up @@ -6665,7 +6573,7 @@ steps:
each <var>name</var> in <var>names</var>, run these substeps:

<ol>
<li><p>Let <var>lowercaseName</var> be <var>name</var>, <a>converted to ASCII lowercase</a>.
<li><p>Let <var>lowercaseName</var> be <var>name</var>, in <a>ASCII lowercase</a>.

<li><p>If <var>lowercaseName</var> is not equal to <var>name</var>, remove <var>name</var> from
<var>names</var>.
Expand Down Expand Up @@ -9407,8 +9315,7 @@ associated <a>attribute</a>'s <a for=Attr>local name</a>.
<li><p>If the associated <a>attribute</a>'s <a for=Attr>local name</a> does not define
<a for=Node>supported tokens</a>, <a>throw</a> a <code>TypeError</code>.

<li><p>Let <var>lowercase token</var> be a copy of <var>token</var>,
<a>converted to ASCII lowercase</a>.
<li><p>Let <var>lowercase token</var> be a copy of <var>token</var>, in <a>ASCII lowercase</a>.

<li><p>If <var>lowercase token</var> is present in <a for=Node>supported tokens</a>, return true.

Expand Down

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