[html5] r2750 - [] (0) Filling in the rendering section: more margin and alignment presentationa [...]
whatwg at whatwg.org
whatwg at whatwg.org
Wed Feb 4 02:09:29 PST 2009
Author: ianh
Date: 2009-02-04 02:09:28 -0800 (Wed, 04 Feb 2009)
New Revision: 2750
Modified:
index
source
Log:
[] (0) Filling in the rendering section: more margin and alignment presentational hints; fixing the infrastructure around this stuff.
Modified: index
===================================================================
--- index 2009-02-04 02:56:15 UTC (rev 2749)
+++ index 2009-02-04 10:09:28 UTC (rev 2750)
@@ -241,7 +241,7 @@
<li><a href=#signed-integers><span class=secno>2.4.3.2 </span>Signed integers</a></li>
<li><a href=#real-numbers><span class=secno>2.4.3.3 </span>Real numbers</a></li>
<li><a href=#ratios><span class=secno>2.4.3.4 </span>Ratios</a></li>
- <li><a href=#percentages-and-dimensions><span class=secno>2.4.3.5 </span>Percentages and dimensions</a></li>
+ <li><a href=#percentages-and-dimensions><span class=secno>2.4.3.5 </span>Percentages and lengths</a></li>
<li><a href=#lists-of-integers><span class=secno>2.4.3.6 </span>Lists of integers</a></ol></li>
<li><a href=#dates-and-times><span class=secno>2.4.4 </span>Dates and times</a>
<ol>
@@ -2601,16 +2601,98 @@
<li>Return <var title="">number</var>.</li>
- </ol><h5 id=percentages-and-dimensions><span class=secno>2.4.3.5 </span>Percentages and dimensions</h5>
+ </ol><h5 id=percentages-and-dimensions><span class=secno>2.4.3.5 </span>Percentages and lengths</h5>
- <p class=XXX><dfn id=rules-for-parsing-dimension-values>rules for parsing dimension values</dfn> (only
- used by height/width on img, embed, object — lengths in css
- pixels or percentages)</p>
+ <p>A string is a <dfn id=valid-dimension-value>valid dimension value</dfn> if it consists of
+ a character in the range U+0031 DIGIT ONE (1) to U+0039 DIGIT NINE
+ (9), optionally followed by zero of more characters in the range
+ U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), optionally followed
+ by a U+002E FULL STOP character (.) and one of more characters in
+ the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), and
+ optionally suffixed by a U+0025 PERCENT SIGN character (%).</p>
+ <p>A <a href=#valid-dimension-value>valid dimension value</a> represents the number that
+ is represented in base ten by that string of digits, optionally with
+ a fractional component. If the U+0025 PERCENT SIGN is present, then
+ the dimension is a percentage; otherwise, it is a length.</p>
+ <p class=note>For historical reasons, percentanges and lengths
+ less than 1.0 cannot be represented as <a href=#valid-dimension-value title="valid dimension
+ value">valid dimension values</a>.</p>
- <h5 id=lists-of-integers><span class=secno>2.4.3.6 </span>Lists of integers</h5>
+ <p>The <dfn id=rules-for-parsing-dimension-values>rules for parsing dimension values</dfn> are as given in
+ the following algorithm. When invoked, the steps must be followed in
+ the order given, aborting at the first step that returns a
+ value. This algorithm will either return a number greater than or
+ equal to 1.0, or an error; if a number is returned, then it is
+ further categorised as either a percentage or a length.</p>
+ <ol><li><p>Let <var title="">input</var> be the string being
+ parsed.</li>
+
+ <li><p>Let <var title="">position</var> be a pointer into <var title="">input</var>, initially pointing at the start of the
+ string.</li>
+
+ <li><p><a href=#skip-whitespace>Skip whitespace</a>.</li>
+
+ <li><p>If <var title="">position</var> is past the end of <var title="">input</var>, return an error.</li>
+
+ <li><p>If the next character is a U+002B PLUS SIGN character (+),
+ advance <var title="">position</var> to the next character.</li>
+
+ <li><p><a href=#collect-a-sequence-of-characters>Collect a sequence of characters</a> that are
+ U+0030 DIGIT ZERO (0) characters, and discard them.</li>
+
+ <li><p>If <var title="">position</var> is past the end of <var title="">input</var>, return an error.</li>
+
+ <li><p>If the next character is not one of U+0031 DIGIT ONE (1)
+ .. U+0039 DIGIT NINE (9), then return an error.</li>
+
+ <!-- Ok. At this point we know we have a number. It might have
+ trailing garbage which we'll ignore, but it's a number, and we
+ won't return an error. -->
+
+ <li><p><a href=#collect-a-sequence-of-characters>Collect a sequence of characters</a> in the range
+ U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), and interpret the
+ resulting sequence as a base-ten integer. Let <var title="">value</var> be that number.</li>
+
+ <li><p>If <var title="">position</var> is past the end of <var title="">input</var>, return <var title="">value</var> as an
+ integer.</li>
+
+ <li>
+
+ <p>If the next character is a U+002E FULL STOP character (.):</p>
+
+ <ol><li><p>Advance <var title="">position</var> to the next
+ character.</li>
+
+ <li><p>If the next character is not one of U+0030 DIGIT ZERO (0)
+ .. U+0039 DIGIT NINE (9), then return <var title="">value</var>
+ as an integer.</li>
+
+ <li><p><a href=#collect-a-sequence-of-characters>Collect a sequence of characters</a> in the range
+ U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). Let <var title="">length</var> be the number of characters collected. Let
+ <var title="">fraction</var> be the result of interpreting the
+ collected characters as a base-ten integer, and then dividing
+ that number by <span title="">10<sup title=""><var title="">length</var></sup></span>.</li>
+
+ <li><p>Increment <var title="">value</var> by <var title="">fraction</var>.</li>
+
+ </ol></li>
+
+ <li><p><a href=#collect-a-sequence-of-characters>Collect a sequence of characters</a> that are
+ U+0030 DIGIT ZERO (0) characters, and discard them.</li>
+
+ <li><p>If <var title="">position</var> is past the end of <var title="">input</var>, return <var title="">value</var> as a
+ length.</li>
+
+ <li><p>If the next character is a U+0025 PERCENT SIGN character
+ (%), return <var title="">value</var> as a percentage.</li>
+
+ <li><p>Return <var title="">value</var> as a length.</li>
+
+ </ol><h5 id=lists-of-integers><span class=secno>2.4.3.6 </span>Lists of integers</h5>
+
<p>A <dfn id=valid-list-of-integers>valid list of integers</dfn> is a number of <a href=#valid-integer title="valid integer">valid integers</a> separated by U+002C
COMMA characters, with no other characters (e.g. no <a href=#space-character title="space character">space characters</a>). In addition, there
might be restrictions on the number of integers that can be given,
@@ -55784,10 +55866,15 @@
<h4 id=introduction-9><span class=secno>10.3.1 </span>Introduction</h4>
- <p>The CSS rules given in these subsections are expected to be used
- as the defaults for all documents that contain <a href=#html-elements>HTML
- elements</a> when presented in visual media.</p>
+ <p>The CSS rules given in these subsections are, unless otherwise
+ specified, expected to be used as part of the user-agent level style
+ sheet defaults for all documents that contain <a href=#html-elements>HTML
+ elements</a>.</p>
+ <p>Some rules are intended for the author-level zero-specificity
+ presentational hints part of the CSS cascade; these are explicitly
+ called out as <dfn id=presentational-hints>presentational hints</dfn>.</p>
+
<p>Rules regarding left and right margins are given here as
appropriate for elements whose 'direction' property is 'ltr', and
are expected to be flipped around on elements whose 'direction'
@@ -55796,7 +55883,25 @@
<p class=XXX>Please send feedback if you can accurately describe
rules required by legacy content.</p>
+ <p>When the text below says that an attribute <var title="">attribute</var> on an element <var title="">element</var>
+ <dfn id=maps-to-the-pixel-length-property>maps to the pixel length property</dfn> (or properties) <var title="">properties</var>, it means that if <var title="">element</var> has an attribute <var title="">attribute</var> set, and parsing that attribute's value
+ using the <a href=#rules-for-parsing-non-negative-integers>rules for parsing non-negative integers</a>
+ doesn't generate an error, then the user agent is expected to use
+ the parsed value as a pixel length for a <a href=#presentational-hints title="presentational
+ hints">presentational hint</a> for <var title="">property</var>.</p>
+ <p>When the text below says that an attribute <var title="">attribute</var> on an element <var title="">element</var>
+ <dfn id=maps-to-the-dimension-property>maps to the dimension property</dfn> (or properties) <var title="">properties</var>, it means that if <var title="">element</var> has an attribute <var title="">attribute</var> set, and parsing that attribute's value
+ using the <a href=#rules-for-parsing-dimension-values>rules for parsing dimension values</a> doesn't
+ generate an error, then the user agent is expected to use the parsed
+ dimension as the value for a <a href=#presentational-hints title="presentational
+ hints">presentational hint</a> for <var title="">property</var>,
+ with the value given as a pixel length if the dimension was an
+ integer, and with the value given as a percentage if the dimension
+ was a percentage.</p>
+
+
+
<h4 id=display-types><span class=secno>10.3.2 </span>Display types</h4>
<pre class=css>@namespace url(http://www.w3.org/1999/xhtml);
@@ -55865,31 +55970,14 @@
table { border-spacing: 2px; border-collapse: separate; }
td, th { padding: 1px; }</pre>
- <p>In <a href=#quirks-mode>quirks mode</a>, the following rules are also
- expected to apply:</p>
+ <p>For each property in the table below, given a <code><a href=#the-body-element>body</a></code>
+ element, the first attribute that exists <a href=#maps-to-the-pixel-length-property>maps to the pixel
+ length property</a> on the <code><a href=#the-body-element>body</a></code> element. If none of
+ the attributes for a property are found, or if the value of the
+ attribute that was found cannot be parsed successfully, then a
+ default value of 8px is expected to be used for that property
+ instead.</p>
- <pre class=css>@namespace url(http://www.w3.org/1999/xhtml);
-form { margin-bottom: 1em; }
-img[align=left] { margin-right: 3px; }
-img[align=right] { margin-left: 3px; }</pre>
-
- <p>When a <code>Document</code> is in <a href=#quirks-mode>quirks mode</a>,
- margins on <a href=#html-elements>HTML elements</a> that collapse with the top or
- bottom of the initial containing block are expected to be collapsed
- to zero.</p>
-
- <hr><p>For a <code><a href=#the-body-element>body</a></code> element, the 'margin-top',
- 'margin-right', 'margin-bottom', and 'margin-left' properties are
- expected to be set by presentational hints from a variety of source,
- given in the table below in precedence order. If one of the
- attributes listed is present, then the first such attribute's value
- is expected to be parsed using the <a href=#rules-for-parsing-non-negative-integers>rules for parsing
- non-negative integers</a>; if this does not result in an error,
- then the parsed value is expected to be used as a pixel length for
- the corresponding property. If no attribute is found, or if the
- attribute's value cannot be parsed successfully, then a default
- value of 8px is expected to be used.</p>
-
<!-- XXX so, uh, about the cross-site-styling hole below... -->
<table><thead><tr><th>Property
@@ -55919,14 +56007,68 @@
<code>frame</code> or <code><a href=#the-iframe-element>iframe</a></code> element. Otherwise, there
is no <a href=#container-frame-element>container frame element</a>.</p>
- <hr><p class=XXX>...tables...</p>
- <!-- cellspacing, cellpadding, height, width* (int/%; *width=0 => width:auto); <table hspace/vspace> (int); <table cols>; <table border> (border => border=1); -->
- <!-- td/th width height: 0=>auto; %=>%; n=>px -->
- <!-- col width=int/% span=n -->
- <!-- tbody/thead/tfoot height=int/% (ignore %?) -->
- <!-- tr height=int/% -->
+ <hr><p>The <code><a href=#the-table-element>table</a></code> element's <code title=attr-table-cellspacing>cellspacing</code> attribute
+ <a href=#maps-to-the-pixel-length-property>maps to the pixel length property</a> 'border-spacing' on the
+ element.</p>
+ <p>The <code><a href=#the-table-element>table</a></code> element's <code title=attr-table-cellpadding>cellpadding</code> attribute <a href=#maps-to-the-pixel-length-property title="maps to the pixel length property">maps to the pixel length
+ properties</a> 'padding-top', 'padding-right', 'padding-bottom',
+ and 'padding-left' of any <code><a href=#the-td-element>td</a></code> and <code><a href=#the-th-element>th</a></code>
+ elements that have corresponding <a href=#concept-cell title=concept-cell>cells</a> in the <a href=#concept-table title=concept-table>table</a> corresponding to the
+ <code><a href=#the-table-element>table</a></code> element.</p>
+ <p>The <code><a href=#the-table-element>table</a></code> element's <code title=attr-table-hspace>hspace</code> attribute <a href=#maps-to-the-pixel-length-property title="maps
+ to the pixel length property">maps to the pixel length properties</a>
+ 'margin-left' and 'margin-right' on the <code><a href=#the-table-element>table</a></code>
+ element.</p>
+
+ <p>The <code><a href=#the-table-element>table</a></code> element's <code title=attr-table-vspace>vspace</code> attribute <a href=#maps-to-the-pixel-length-property title="maps
+ to the pixel length property">maps to the pixel length properties</a>
+ 'margin-top' and 'margin-bottom' on the <code><a href=#the-table-element>table</a></code>
+ element.</p>
+
+ <p>The <code><a href=#the-table-element>table</a></code> element's <code title=attr-table-height>height</code> attribute <a href=#maps-to-the-dimension-property>maps to the
+ dimension property</a> 'height' on the <code><a href=#the-table-element>table</a></code>
+ element.</p>
+
+ <p>The <code><a href=#the-table-element>table</a></code> element's <code title=attr-table-width>width</code> attribute <a href=#maps-to-the-dimension-property>maps to the
+ dimension property</a> 'width' on the <code><a href=#the-table-element>table</a></code>
+ element.</p>
+
+ <p>The <code><a href=#the-col-element>col</a></code> element's <code title=attr-col-width>width</code> attribute <a href=#maps-to-the-dimension-property>maps to the
+ dimension property</a> 'width' on the <code><a href=#the-col-element>col</a></code>
+ element.</p>
+
+ <p>The <code><a href=#the-tr-element>tr</a></code> element's <code title=attr-tr-height>height</code> attribute <a href=#maps-to-the-dimension-property>maps to the
+ dimension property</a> 'height' on the <code><a href=#the-tr-element>tr</a></code>
+ element.</p>
+
+ <p>The <code><a href=#the-td-element>td</a></code> and <code><a href=#the-th-element>th</a></code> elements' <code title=attr-tdth-height>height</code> attributes <a href=#maps-to-the-dimension-property title="maps
+ to the dimension property">map to the dimension property</a> 'height'
+ on the element.</p>
+
+ <p>The <code><a href=#the-td-element>td</a></code> and <code><a href=#the-th-element>th</a></code> elements' <code title=attr-tdth-height>height</code> attributes <a href=#maps-to-the-dimension-property title="maps
+ to the dimension property">map to the dimension property</a> 'height'
+ on the element.</p>
+
+ <p>The <code><a href=#the-td-element>td</a></code> and <code><a href=#the-th-element>th</a></code> elements' <code title=attr-tdth-width>width</code> attributes <a href=#maps-to-the-dimension-property title="maps
+ to the dimension property">map to the dimension property</a> 'width'
+ on the element.</p>
+
+ <hr><p>In <a href=#quirks-mode>quirks mode</a>, the following rules are also
+ expected to apply:</p>
+
+ <pre class=css>@namespace url(http://www.w3.org/1999/xhtml);
+form { margin-bottom: 1em; }
+img[align=left] { margin-right: 3px; }
+img[align=right] { margin-left: 3px; }</pre>
+
+ <p>When a <code>Document</code> is in <a href=#quirks-mode>quirks mode</a>,
+ margins on <a href=#html-elements>HTML elements</a> that collapse with the top or
+ bottom of the initial containing block are expected to be collapsed
+ to zero.</p>
+
+
<h4 id=alignment><span class=secno>10.3.4 </span>Alignment</h4>
<pre class=css>@namespace url(http://www.w3.org/1999/xhtml);
@@ -55935,28 +56077,92 @@
tr, td, th { vertical-align: inherit; }
sub { vertical-align: sub; }
sup { vertical-align: super; }
+th { text-align: center; }</pre>
+ <hr><p>The following rules are also expected to apply, as
+ <a href=#presentational-hints>presentational hints</a>:</p>
+
+ <pre class=css>@namespace url(http://www.w3.org/1999/xhtml);
+
table[align=left], img[align=left] { float: left; }
table[align=right], img[align=right] { float: right; }
-th { text-align: center; }</pre>
+table[align=center], table[align=abscenter],
+table[align=abdmiddle], table[align=middle] {
+ margin-left: auto; margin-right: auto;
+}
- <p>The <code><a href=#center>center</a></code> and <code><a href=#the-caption-element>caption</a></code> elements are
- expected to center text within themselves, as if they had their
- 'text-align' property set to 'center', and to center blocks and
- tables within them, as their descendants had their horizontal
- margins set to 'auto'.</p>
+caption[align=bottom] { caption-side: bottom; }
+p[align=left], h1[align=left], h2[align=left], h3[align=left],
+h4[align=left], h5[align=left], h6[align=left] {
+ text-align: left;
+}
+p[align=right], h1[align=right], h2[align=right], h3[align=right],
+h4[align=right], h5[align=right], h6[align=right] {
+ text-align: right;
+}
+p[align=center], h1[align=center], h2[align=center], h3[align=center],
+h4[align=center], h5[align=center], h6[align=center] {
+ text-align: center;
+}
+p[align=justify], h1[align=justify], h2[align=justify], h3[align=justify],
+h4[align=justify], h5[align=justify], h6[align=justify] {
+ text-align: justify;
+}
+col[valign=top], thead[valign=top], tbody[valign=top],
+tfoot[valign=top], tr[valign=top], td[valign=top], th[valign=top] {
+ vertial-align: top;
+}
+col[valign=middle], thead[valign=middle], tbody[valign=middle],
+tfoot[valign=middle], tr[valign=middle], td[valign=middle], th[valign=middle] {
+ vertial-align: middle;
+}
+col[valign=bottom], thead[valign=bottom], tbody[valign=bottom],
+tfoot[valign=bottom], tr[valign=bottom], td[valign=bottom], th[valign=bottom] {
+ vertial-align: bottom;
+}
+col[valign=baseline], thead[valign=baseline], tbody[valign=baseline],
+tfoot[valign=baseline], tr[valign=baseline], td[valign=baseline], th[valign=baseline] {
+ vertial-align: baseline;
+}</pre>
- <!-- XXX <div/h1-h6/p align="left|right|center/middle|justify"> -->
+ <p>The <code><a href=#center>center</a></code> element, the <code><a href=#the-caption-element>caption</a></code> element
+ unless specified otherwise below, and the <code><a href=#the-div-element>div</a></code> element
+ when its <code title=attr-div-align>align</code> attribute's value
+ is an <a href=#ascii-case-insensitive>ASCII case-insensitive</a> match for the string
+ "<code title="">center</code>", are expected to center text within
+ themselves, as if they had their 'text-align' property set to
+ 'center' in a <a href=#presentational-hints title="presentational hints">presentational
+ hint</a>, and to center blocks and tables within them, as if
+ their descendants had their 'margin-left' and 'margin-right'
+ properties set to 'auto' in <a href=#presentational-hints>presentational hints</a>.</p>
- <hr><p class=XXX>...tables...</p>
- <!-- table align="left|right|center/abscenter/absmiddle/middle|char|justify" -->
- <!-- caption align="left|right|top|bottom" caption-side -->
- <!-- tr/td/th/col/tbody/thead/tfoot align="left|right|center/absmiddle|char|justify" -->
- <!-- tr/td/th/col/tbody/thead/tfoot valign="top|middle|bottom|baseline" -->
- <!-- tr/td/th/col/tbody/thead/tfoot ch=? charoff=n>0 -->
+ <p>The <code><a href=#the-div-element>div</a></code>, <code><a href=#the-caption-element>caption</a></code>, <code><a href=#the-thead-element>thead</a></code>,
+ <code><a href=#the-tbody-element>tbody</a></code>, <code><a href=#the-tfoot-element>tfoot</a></code>, <code><a href=#the-tr-element>tr</a></code>,
+ <code><a href=#the-td-element>td</a></code>, and <code><a href=#the-th-element>th</a></code> elements, when they have an
+ <code title=attr-align>align</code> attribute whose value is an
+ <a href=#ascii-case-insensitive>ASCII case-insensitive</a> match for the string "<code title="">left</code>" or "<code title="">justify</code>", are
+ expected to left-align text within themselves, as if they had their
+ 'text-align' property set to 'left' in a <a href=#presentational-hints title="presentational
+ hints">presentational hint</a>, and to left-align blocks and
+ tables within them, as if their descendants had their 'margin-right'
+ property set to 'auto' in <a href=#presentational-hints>presentational hints</a>.</p>
+ <p>The <code><a href=#the-div-element>div</a></code>, <code><a href=#the-caption-element>caption</a></code>, <code><a href=#the-thead-element>thead</a></code>,
+ <code><a href=#the-tbody-element>tbody</a></code>, <code><a href=#the-tfoot-element>tfoot</a></code>, <code><a href=#the-tr-element>tr</a></code>,
+ <code><a href=#the-td-element>td</a></code>, and <code><a href=#the-th-element>th</a></code> elements, when they have an
+ <code title=attr-align>align</code> attribute whose value is an
+ <a href=#ascii-case-insensitive>ASCII case-insensitive</a> match for the string "<code title="">right</code>", are expected to right-align text within
+ themselves, as if they had their 'text-align' property set to
+ 'right' in a <a href=#presentational-hints title="presentational hints">presentational
+ hint</a>, and to right-align blocks and tables within them, as if
+ their descendants had their 'margin-left' property set to 'auto' in
+ <a href=#presentational-hints>presentational hints</a>.</p>
+ <p>In all these cases, the effect on descendants is expected to only
+ extend to descendants that do not themselves have an applicable
+ <code title=attr-align>align</code> attribute.</p>
+
<h4 id=fonts-and-colors><span class=secno>10.3.5 </span>Fonts and colors</h4>
<pre class=css>@namespace url(http://www.w3.org/1999/xhtml);
@@ -56080,7 +56286,7 @@
<!-- XXX <ol>/<ul> type (1|a|A|i|I|disc|circle/round|square), start (n); <li> type (A|a|I|i|1|disc|circle/round|square), value (n) -->
<hr><p class=XXX>...tables...</p>
- <!-- table: rules/layout/frames -->
+ <!-- table: rules/layout/frames; <table border> (border => border=1); -->
<h4 id=resetting-rules-for-inherited-properties><span class=secno>10.3.7 </span>Resetting rules for inherited properties</h4>
Modified: source
===================================================================
--- source 2009-02-04 02:56:15 UTC (rev 2749)
+++ source 2009-02-04 10:09:28 UTC (rev 2750)
@@ -1707,14 +1707,115 @@
</ol>
- <h5 id="percentages-and-dimensions">Percentages and dimensions</h5>
+ <h5 id="percentages-and-dimensions">Percentages and lengths</h5>
- <p class="XXX"><dfn>rules for parsing dimension values</dfn> (only
- used by height/width on img, embed, object — lengths in css
- pixels or percentages)</p>
+ <p>A string is a <dfn>valid dimension value</dfn> if it consists of
+ a character in the range U+0031 DIGIT ONE (1) to U+0039 DIGIT NINE
+ (9), optionally followed by zero of more characters in the range
+ U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), optionally followed
+ by a U+002E FULL STOP character (.) and one of more characters in
+ the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), and
+ optionally suffixed by a U+0025 PERCENT SIGN character (%).</p>
+ <p>A <span>valid dimension value</span> represents the number that
+ is represented in base ten by that string of digits, optionally with
+ a fractional component. If the U+0025 PERCENT SIGN is present, then
+ the dimension is a percentage; otherwise, it is a length.</p>
+ <p class="note">For historical reasons, percentanges and lengths
+ less than 1.0 cannot be represented as <span title="valid dimension
+ value">valid dimension values</span>.</p>
+ <p>The <dfn>rules for parsing dimension values</dfn> are as given in
+ the following algorithm. When invoked, the steps must be followed in
+ the order given, aborting at the first step that returns a
+ value. This algorithm will either return a number greater than or
+ equal to 1.0, or an error; if a number is returned, then it is
+ further categorised as either a percentage or a length.</p>
+
+ <ol>
+
+ <li><p>Let <var title="">input</var> be the string being
+ parsed.</p></li>
+
+ <li><p>Let <var title="">position</var> be a pointer into <var
+ title="">input</var>, initially pointing at the start of the
+ string.</p></li>
+
+ <li><p><span>Skip whitespace</span>.</p></li>
+
+ <li><p>If <var title="">position</var> is past the end of <var
+ title="">input</var>, return an error.</p></li>
+
+ <li><p>If the next character is a U+002B PLUS SIGN character (+),
+ advance <var title="">position</var> to the next character.</li>
+
+ <li><p><span>Collect a sequence of characters</span> that are
+ U+0030 DIGIT ZERO (0) characters, and discard them.</p></li>
+
+ <li><p>If <var title="">position</var> is past the end of <var
+ title="">input</var>, return an error.</p></li>
+
+ <li><p>If the next character is not one of U+0031 DIGIT ONE (1)
+ .. U+0039 DIGIT NINE (9), then return an error.</p></li>
+
+ <!-- Ok. At this point we know we have a number. It might have
+ trailing garbage which we'll ignore, but it's a number, and we
+ won't return an error. -->
+
+ <li><p><span>Collect a sequence of characters</span> in the range
+ U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), and interpret the
+ resulting sequence as a base-ten integer. Let <var
+ title="">value</var> be that number.</li>
+
+ <li><p>If <var title="">position</var> is past the end of <var
+ title="">input</var>, return <var title="">value</var> as an
+ integer.</p></li>
+
+ <li>
+
+ <p>If the next character is a U+002E FULL STOP character (.):</p>
+
+ <ol>
+
+ <li><p>Advance <var title="">position</var> to the next
+ character.</p></li>
+
+ <li><p>If the next character is not one of U+0030 DIGIT ZERO (0)
+ .. U+0039 DIGIT NINE (9), then return <var title="">value</var>
+ as an integer.</p></li>
+
+ <li><p><span>Collect a sequence of characters</span> in the range
+ U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). Let <var
+ title="">length</var> be the number of characters collected. Let
+ <var title="">fraction</var> be the result of interpreting the
+ collected characters as a base-ten integer, and then dividing
+ that number by <span title="">10<sup title=""><var
+ title="">length</var></sup></span>.</li>
+
+ <li><p>Increment <var title="">value</var> by <var
+ title="">fraction</var>.</p></li>
+
+ </ol>
+
+ </li>
+
+ <li><p><span>Collect a sequence of characters</span> that are
+ U+0030 DIGIT ZERO (0) characters, and discard them.</p></li>
+
+ <li><p>If <var title="">position</var> is past the end of <var
+ title="">input</var>, return <var title="">value</var> as a
+ length.</p></li>
+
+ <li><p>If the next character is a U+0025 PERCENT SIGN character
+ (%), return <var title="">value</var> as a percentage.</p></li>
+
+ <li><p>Return <var title="">value</var> as a length.</p></li>
+
+ </ol>
+
+
+
<h5>Lists of integers</h5>
<p>A <dfn>valid list of integers</dfn> is a number of <span
@@ -60973,10 +61074,15 @@
<h4>Introduction</h4>
- <p>The CSS rules given in these subsections are expected to be used
- as the defaults for all documents that contain <span>HTML
- elements</span> when presented in visual media.</p>
+ <p>The CSS rules given in these subsections are, unless otherwise
+ specified, expected to be used as part of the user-agent level style
+ sheet defaults for all documents that contain <span>HTML
+ elements</span>.</p>
+ <p>Some rules are intended for the author-level zero-specificity
+ presentational hints part of the CSS cascade; these are explicitly
+ called out as <dfn>presentational hints</dfn>.</p>
+
<p>Rules regarding left and right margins are given here as
appropriate for elements whose 'direction' property is 'ltr', and
are expected to be flipped around on elements whose 'direction'
@@ -60985,7 +61091,34 @@
<p class="XXX">Please send feedback if you can accurately describe
rules required by legacy content.</p>
+ <p>When the text below says that an attribute <var
+ title="">attribute</var> on an element <var title="">element</var>
+ <dfn>maps to the pixel length property</dfn> (or properties) <var
+ title="">properties</var>, it means that if <var
+ title="">element</var> has an attribute <var
+ title="">attribute</var> set, and parsing that attribute's value
+ using the <span>rules for parsing non-negative integers</span>
+ doesn't generate an error, then the user agent is expected to use
+ the parsed value as a pixel length for a <span title="presentational
+ hints">presentational hint</span> for <var
+ title="">property</var>.</p>
+ <p>When the text below says that an attribute <var
+ title="">attribute</var> on an element <var title="">element</var>
+ <dfn>maps to the dimension property</dfn> (or properties) <var
+ title="">properties</var>, it means that if <var
+ title="">element</var> has an attribute <var
+ title="">attribute</var> set, and parsing that attribute's value
+ using the <span>rules for parsing dimension values</span> doesn't
+ generate an error, then the user agent is expected to use the parsed
+ dimension as the value for a <span title="presentational
+ hints">presentational hint</span> for <var title="">property</var>,
+ with the value given as a pixel length if the dimension was an
+ integer, and with the value given as a percentage if the dimension
+ was a percentage.</p>
+
+
+
<h4>Display types</h4>
<pre class="css">@namespace url(http://www.w3.org/1999/xhtml);
@@ -61058,33 +61191,14 @@
table { border-spacing: 2px; border-collapse: separate; }
td, th { padding: 1px; }</pre>
- <p>In <span>quirks mode</span>, the following rules are also
- expected to apply:</p>
+ <p>For each property in the table below, given a <code>body</code>
+ element, the first attribute that exists <span>maps to the pixel
+ length property</span> on the <code>body</code> element. If none of
+ the attributes for a property are found, or if the value of the
+ attribute that was found cannot be parsed successfully, then a
+ default value of 8px is expected to be used for that property
+ instead.</p>
- <pre class="css">@namespace url(http://www.w3.org/1999/xhtml);
-form { margin-bottom: 1em; }
-img[align=left] { margin-right: 3px; }
-img[align=right] { margin-left: 3px; }</pre>
-
- <p>When a <code>Document</code> is in <span>quirks mode</span>,
- margins on <span>HTML elements</span> that collapse with the top or
- bottom of the initial containing block are expected to be collapsed
- to zero.</p>
-
- <hr>
-
- <p>For a <code>body</code> element, the 'margin-top',
- 'margin-right', 'margin-bottom', and 'margin-left' properties are
- expected to be set by presentational hints from a variety of source,
- given in the table below in precedence order. If one of the
- attributes listed is present, then the first such attribute's value
- is expected to be parsed using the <span>rules for parsing
- non-negative integers</span>; if this does not result in an error,
- then the parsed value is expected to be used as a pixel length for
- the corresponding property. If no attribute is found, or if the
- attribute's value cannot be parsed successfully, then a default
- value of 8px is expected to be used.</p>
-
<!-- XXX so, uh, about the cross-site-styling hole below... -->
<table>
@@ -61137,14 +61251,84 @@
<hr>
- <p class="XXX">...tables...</p>
- <!-- cellspacing, cellpadding, height, width* (int/%; *width=0 => width:auto); <table hspace/vspace> (int); <table cols>; <table border> (border => border=1); -->
- <!-- td/th width height: 0=>auto; %=>%; n=>px -->
- <!-- col width=int/% span=n -->
- <!-- tbody/thead/tfoot height=int/% (ignore %?) -->
- <!-- tr height=int/% -->
+ <p>The <code>table</code> element's <code
+ title="attr-table-cellspacing">cellspacing</code> attribute
+ <span>maps to the pixel length property</span> 'border-spacing' on the
+ element.</p>
+ <p>The <code>table</code> element's <code
+ title="attr-table-cellpadding">cellpadding</code> attribute <span
+ title="maps to the pixel length property">maps to the pixel length
+ properties</span> 'padding-top', 'padding-right', 'padding-bottom',
+ and 'padding-left' of any <code>td</code> and <code>th</code>
+ elements that have corresponding <span
+ title="concept-cell">cells</span> in the <span
+ title="concept-table">table</span> corresponding to the
+ <code>table</code> element.</p>
+ <p>The <code>table</code> element's <code
+ title="attr-table-hspace">hspace</code> attribute <span title="maps
+ to the pixel length property">maps to the pixel length properties</span>
+ 'margin-left' and 'margin-right' on the <code>table</code>
+ element.</p>
+
+ <p>The <code>table</code> element's <code
+ title="attr-table-vspace">vspace</code> attribute <span title="maps
+ to the pixel length property">maps to the pixel length properties</span>
+ 'margin-top' and 'margin-bottom' on the <code>table</code>
+ element.</p>
+
+ <p>The <code>table</code> element's <code
+ title="attr-table-height">height</code> attribute <span>maps to the
+ dimension property</span> 'height' on the <code>table</code>
+ element.</p>
+
+ <p>The <code>table</code> element's <code
+ title="attr-table-width">width</code> attribute <span>maps to the
+ dimension property</span> 'width' on the <code>table</code>
+ element.</p>
+
+ <p>The <code>col</code> element's <code
+ title="attr-col-width">width</code> attribute <span>maps to the
+ dimension property</span> 'width' on the <code>col</code>
+ element.</p>
+
+ <p>The <code>tr</code> element's <code
+ title="attr-tr-height">height</code> attribute <span>maps to the
+ dimension property</span> 'height' on the <code>tr</code>
+ element.</p>
+
+ <p>The <code>td</code> and <code>th</code> elements' <code
+ title="attr-tdth-height">height</code> attributes <span title="maps
+ to the dimension property">map to the dimension property</span> 'height'
+ on the element.</p>
+
+ <p>The <code>td</code> and <code>th</code> elements' <code
+ title="attr-tdth-height">height</code> attributes <span title="maps
+ to the dimension property">map to the dimension property</span> 'height'
+ on the element.</p>
+
+ <p>The <code>td</code> and <code>th</code> elements' <code
+ title="attr-tdth-width">width</code> attributes <span title="maps
+ to the dimension property">map to the dimension property</span> 'width'
+ on the element.</p>
+
+ <hr>
+
+ <p>In <span>quirks mode</span>, the following rules are also
+ expected to apply:</p>
+
+ <pre class="css">@namespace url(http://www.w3.org/1999/xhtml);
+form { margin-bottom: 1em; }
+img[align=left] { margin-right: 3px; }
+img[align=right] { margin-left: 3px; }</pre>
+
+ <p>When a <code>Document</code> is in <span>quirks mode</span>,
+ margins on <span>HTML elements</span> that collapse with the top or
+ bottom of the initial containing block are expected to be collapsed
+ to zero.</p>
+
+
<h4>Alignment</h4>
<pre class="css">@namespace url(http://www.w3.org/1999/xhtml);
@@ -61153,28 +61337,94 @@
tr, td, th { vertical-align: inherit; }
sub { vertical-align: sub; }
sup { vertical-align: super; }
+th { text-align: center; }</pre>
+ <hr>
+
+ <p>The following rules are also expected to apply, as
+ <span>presentational hints</span>:</p>
+
+ <pre class="css">@namespace url(http://www.w3.org/1999/xhtml);
+
table[align=left], img[align=left] { float: left; }
table[align=right], img[align=right] { float: right; }
-th { text-align: center; }</pre>
+table[align=center], table[align=abscenter],
+table[align=abdmiddle], table[align=middle] {
+ margin-left: auto; margin-right: auto;
+}
- <p>The <code>center</code> and <code>caption</code> elements are
- expected to center text within themselves, as if they had their
- 'text-align' property set to 'center', and to center blocks and
- tables within them, as their descendants had their horizontal
- margins set to 'auto'.</p>
+caption[align=bottom] { caption-side: bottom; }
+p[align=left], h1[align=left], h2[align=left], h3[align=left],
+h4[align=left], h5[align=left], h6[align=left] {
+ text-align: left;
+}
+p[align=right], h1[align=right], h2[align=right], h3[align=right],
+h4[align=right], h5[align=right], h6[align=right] {
+ text-align: right;
+}
+p[align=center], h1[align=center], h2[align=center], h3[align=center],
+h4[align=center], h5[align=center], h6[align=center] {
+ text-align: center;
+}
+p[align=justify], h1[align=justify], h2[align=justify], h3[align=justify],
+h4[align=justify], h5[align=justify], h6[align=justify] {
+ text-align: justify;
+}
+col[valign=top], thead[valign=top], tbody[valign=top],
+tfoot[valign=top], tr[valign=top], td[valign=top], th[valign=top] {
+ vertial-align: top;
+}
+col[valign=middle], thead[valign=middle], tbody[valign=middle],
+tfoot[valign=middle], tr[valign=middle], td[valign=middle], th[valign=middle] {
+ vertial-align: middle;
+}
+col[valign=bottom], thead[valign=bottom], tbody[valign=bottom],
+tfoot[valign=bottom], tr[valign=bottom], td[valign=bottom], th[valign=bottom] {
+ vertial-align: bottom;
+}
+col[valign=baseline], thead[valign=baseline], tbody[valign=baseline],
+tfoot[valign=baseline], tr[valign=baseline], td[valign=baseline], th[valign=baseline] {
+ vertial-align: baseline;
+}</pre>
- <!-- XXX <div/h1-h6/p align="left|right|center/middle|justify"> -->
+ <p>The <code>center</code> element, the <code>caption</code> element
+ unless specified otherwise below, and the <code>div</code> element
+ when its <code title="attr-div-align">align</code> attribute's value
+ is an <span>ASCII case-insensitive</span> match for the string
+ "<code title="">center</code>", are expected to center text within
+ themselves, as if they had their 'text-align' property set to
+ 'center' in a <span title="presentational hints">presentational
+ hint</span>, and to center blocks and tables within them, as if
+ their descendants had their 'margin-left' and 'margin-right'
+ properties set to 'auto' in <span>presentational hints</span>.</p>
- <hr>
+ <p>The <code>div</code>, <code>caption</code>, <code>thead</code>,
+ <code>tbody</code>, <code>tfoot</code>, <code>tr</code>,
+ <code>td</code>, and <code>th</code> elements, when they have an
+ <code title="attr-align">align</code> attribute whose value is an
+ <span>ASCII case-insensitive</span> match for the string "<code
+ title="">left</code>" or "<code title="">justify</code>", are
+ expected to left-align text within themselves, as if they had their
+ 'text-align' property set to 'left' in a <span title="presentational
+ hints">presentational hint</span>, and to left-align blocks and
+ tables within them, as if their descendants had their 'margin-right'
+ property set to 'auto' in <span>presentational hints</span>.</p>
- <p class="XXX">...tables...</p>
- <!-- table align="left|right|center/abscenter/absmiddle/middle|char|justify" -->
- <!-- caption align="left|right|top|bottom" caption-side -->
- <!-- tr/td/th/col/tbody/thead/tfoot align="left|right|center/absmiddle|char|justify" -->
- <!-- tr/td/th/col/tbody/thead/tfoot valign="top|middle|bottom|baseline" -->
- <!-- tr/td/th/col/tbody/thead/tfoot ch=? charoff=n>0 -->
+ <p>The <code>div</code>, <code>caption</code>, <code>thead</code>,
+ <code>tbody</code>, <code>tfoot</code>, <code>tr</code>,
+ <code>td</code>, and <code>th</code> elements, when they have an
+ <code title="attr-align">align</code> attribute whose value is an
+ <span>ASCII case-insensitive</span> match for the string "<code
+ title="">right</code>", are expected to right-align text within
+ themselves, as if they had their 'text-align' property set to
+ 'right' in a <span title="presentational hints">presentational
+ hint</span>, and to right-align blocks and tables within them, as if
+ their descendants had their 'margin-left' property set to 'auto' in
+ <span>presentational hints</span>.</p>
+ <p>In all these cases, the effect on descendants is expected to only
+ extend to descendants that do not themselves have an applicable
+ <code title="attr-align">align</code> attribute.</p>
<h4>Fonts and colors</h4>
@@ -61313,7 +61563,7 @@
<hr>
<p class="XXX">...tables...</p>
- <!-- table: rules/layout/frames -->
+ <!-- table: rules/layout/frames; <table border> (border => border=1); -->
<h4>Resetting rules for inherited properties</h4>
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