- From: Elika Etemad via cvs-syncmail <cvsmail@w3.org>
- Date: Wed, 20 Apr 2011 00:49:25 +0000
- To: public-css-commits@w3.org
Update of /sources/public/csswg/css3-text
In directory hutz:/tmp/cvs-serv3111
Modified Files:
Overview.html Overview.src.html
Log Message:
Rewrite prose for 'text-spacing' to be agnostic wrt adding space or removing space.
Index: Overview.html
===================================================================
RCS file: /sources/public/csswg/css3-text/Overview.html,v
retrieving revision 1.112
retrieving revision 1.113
diff -u -d -r1.112 -r1.113
--- Overview.html 19 Apr 2011 18:25:14 -0000 1.112
+++ Overview.html 20 Apr 2011 00:49:20 -0000 1.113
@@ -83,14 +83,14 @@
<h1>CSS Text Level 3</h1>
- <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 19 April 2011</h2>
+ <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 20 April 2011</h2>
<dl>
<dt>This version:
<dd><a href="http://dev.w3.org/csswg/css3-text/Overview.html">$Date:
- 2011/04/19 17:16:46 $ (CVS $Revision$)</a> <!--
- <dd><a href="http://www.w3.org/TR/2011/WD-css3-text-20110419/">http://www.w3.org/TR/2011/WD-css3-text-20110419/</a></dd>
+ 2011/04/19 18:25:14 $ (CVS $Revision$)</a> <!--
+ <dd><a href="http://www.w3.org/TR/2011/WD-css3-text-20110420/">http://www.w3.org/TR/2011/WD-css3-text-20110420/</a></dd>
-->
@@ -3573,88 +3573,120 @@
<td>specified value
</table>
- <p>This property determines spacing between two characters classes. The
- spacing may either be created or trimmed. Values are defined as follows:
+ <p>This property controls spacing between adjacent characters within the
+ same inline formatting context using a set of character-class-based rules.
+ Such spacing can either be created between or trimmed from the affected
+ glyphs. Values are defined as follows:
<dl>
<dt><dfn id=normal5 title="text-spacing:normal">normal</dfn>
- <dd>Trim (kern) the blank half of fullwidth closing punctuation at the end
- of each line if it does not otherwise fit prior to justification.</dd>
- <!--
- <dd>Equivalent to ‘<code class=css>space-start allow-end justify</code>’.</dd>
- -->
+ <dd>Specifies the baseline behavior (defined below).
+ <!-- Equivalent to ''space-start allow-end justify'' -->
<dt><dfn id=trim-start title="text-spacing:trim-start">trim-start</dfn>
- <dd>Trim (kern) the blank half of fullwidth opening punctuation at the
- beginning of each line.</dd>
- <!--
+ <dd>Set fullwidth opening punctuation flush at the start of each line. The
+ UA must trim the blank half of fullwidth punctuation glyphs if necessary.
+ <!--
<dt><dfn title="text-spacing:space-start">space-start</dfn></dt>
- <dd>Do not trim the blank half of fullwidth opening punctuation at
- the beginning of each line.</dd>
+ <dd>Set fullwidth opening punctuation at full width at the start
+ of each line. The UA must blank space to fullwidth
+ punctuation if they are not already full width.
-->
- <!--
+ <!--
<dt><dfn title="text-spacing:allow-end">allow-end</dfn></dt>
- <dd>Trim (kern) the blank half of fullwidth closing punctuation at
- the end of each line if it does not otherwise fit prior to
- justification.</dd>
+ <dd>Set fullwidth closing punctuation flush at the end of each
+ line if it does not otherwise fit prior to justification.
+ The UA must trim the blank half of fullwidth punctuation
+ glyphs if necessary.
-->
+
<dt><dfn id=trim-end title="text-spacing:trim-end">trim-end</dfn>
- <dd>Trim (kern) the blank half of fullwidth closing punctuation at the end
- of each line.
-
- <dt><dfn id=space-end title="text-spacing:keep-end">space-end</dfn>
-
- <dd>Do not trim the blank half of fullwidth closing punctuation at the end
- of each line.
+ <dd>Set fullwidth closing punctuation flush at the end of each line. The
+ UA must trim the blank half of fullwidth punctuation glyphs if necessary.
- <dt><dfn id=no-justify title="text-spacing:no-justify">no-justify</dfn>
+ <dt><dfn id=space-end title="text-spacing:space-end">space-end</dfn>
- <dd>The blank portions of fullwidth punctuation must not be trimmed during
- the justification process. (If this value is not specified, the
- justification process may trim the blank portions of fullwidth
- punctuation glyphs.) <span class=note> An example of compression rules is
- given for Japanese in 3.8 Line Adjustment in <a href="#JLREQ"
- rel=biblioentry>[JLREQ]<!--{{JLREQ}}--></a>.</span>
+ <dd>Set fullwidth opening punctuation at full width at the start of each
+ line. The UA must add blank space to fullwidth punctuation if they are
+ not already full width.
<dt><dfn id=ideograph-alpha
title="text-spacing:ideograph-alpha">ideograph-alpha</dfn>
<dd>Creates 1/4em extra spacing between runs of ideographic letters and
non-ideographic letters, such as Latin-based, Cyrillic, Greek, Arabic or
- Hebrew. <span class=note>A commonly used algorithm for determining this
- behavior is specified in <a href="#JLREQ"
+ Hebrew. Unless ‘<code class=css>no-justify</code>’ is also
+ specified, this autospacing may be altered by the justification process.
+ <span class=note>A commonly used algorithm for determining this behavior
+ is specified in <a href="#JLREQ"
rel=biblioentry>[JLREQ]<!--{{JLREQ}}--></a></span>
<dt><dfn id=ideograph-numeric
title="text-spacing:ideograph-numeric">ideograph-numeric</dfn>
<dd>Creates 1/4em extra spacing between runs of ideographic letters and
- non-ideographic numeric glyphs. <span class=note>A commonly used
- algorithm for determining this behavior is specified in <a href="#JLREQ"
- rel=biblioentry>[JLREQ]<!--{{JLREQ}}--></a></span>
+ non-ideographic numeric glyphs. Unless ‘<code
+ class=css>no-justify</code>’ is also specified, this autospacing
+ may be altered by the justification process. <span class=note>A commonly
+ used algorithm for determining this behavior is specified in <a
+ href="#JLREQ" rel=biblioentry>[JLREQ]<!--{{JLREQ}}--></a></span>
<dt><dfn id=punctuation title="text-spacing:punctuation">punctuation</dfn>
<dd>Creates extra non-breaking spacing around punctuation as required by
- language-specific typographic conventions. For example, if the element's
+ language-specific typographic conventions. In CSS3, if the element's
content language is French, narrow no-break space (U+202F) and no-break
- space (U+00A0) should be inserted where required by <a
+ space (U+00A0) is be inserted where required by <a
href="http://unicode.org/udhr/n/notes_fra.html">French typographic
- guidelines</a>.
+ guidelines</a>. Otherwise this value has no effect. However future
+ specifications may add automatic spacing behavior for other languages.
+
+ <dt><dfn id=no-justify title="text-spacing:no-justify">no-justify</dfn>
+
+ <dd>Justification may not alter text-spacing. (If this value is not
+ specified, the justification process may alter autospacing.) <span
+ class=note> An example of compression rules is given for Japanese in 3.8
+ Line Adjustment in <a href="#JLREQ"
+ rel=biblioentry>[JLREQ]<!--{{JLREQ}}--></a>.</span>
</dl>
- <p>In all cases, the UA must trim (kern) the blank half of fullwidth
- opening punctuation if its previous adjacent character is a fullwidth
- opening punctuation, fullwidth middle dot punctuation, fullwidth closing
- punctuation, or ideographic space (U+3000). It must also trim (kern) the
- blank half of fullwidth closing punctuation if its next adjacent character
- is a fullwidth closing punctuation, fullwidth middle dot punctuation, or
- ideographic space (U+3000).
+ <p>In the baseline behavior the UA must:
+
+ <ul>
+ <li>Set fullwidth opening punctuation at full width at the start of each
+ line. (This can require adding space to punctuation glyphs.) This
+ behavior can be overridden by specifying ‘<code
+ class=css>trim-start</code>’.
+
+ <li>Set fullwidth closing punctuation flush at the end of each line if it
+ does not otherwise fit prior to justification. (This can require trimming
+ the blank half of fullwidth punctuation glyphs.) This behavior can be
+ overridden by specifying ‘<code class=css>space-end</code>’
+ or ‘<code class=css>trim-end</code>’.
+
+ <li>Set fullwidth opening punctuation at half width if the previous
+ character is a fullwidth opening punctuation, fullwidth middle dot
+ punctuation, fullwidth closing punctuation, or ideographic space
+ (U+3000). Else set it at full width and, unless ‘<code
+ class=css>no-justify</code>’ is specified, allow justification to
+ alter this spacing.
+
+ <li>Set fullwidth closing punctuation at half width if the previous
+ character is a fullwidth closing punctuation, fullwidth middle dot
+ punctuation, or ideographic space (U+3000). Else set it at full width
+ and, unless ‘<code class=css>no-justify</code>’ is specified,
+ allow justification to alter this spacing.
+ </ul>
+
+ <p>Depending on the font system, text-spacing may require either trimming
+ (kerning) the blank half of fullwidth punctuation glyphs (if they must be
+ set flush / at half width), or adding 1/2em of space to the glyphs (if
+ they must be set at full width). When set at full width
<div class=example>
<p>The following example table lists the punctuation pairs affected by
@@ -3815,11 +3847,10 @@
</ul>
</dl>
- <p>Fullwidth opening and closing punctuation must not be trimmed if the
- glyph is not actually fullwidth. This includes the case where the glyph is
- not fullwidth as a result of the kerning in the font. A fullwidth glyph is
- one that has the same advance width as a typical Han character in the same
- font.
+ <p>Fullwidth punctuation must not be trimmed if the glyph is not actually
+ fullwidth. This includes the case where the glyph is not fullwidth as a
+ result of the kerning in the font. A fullwidth glyph is one that has the
+ same advance width as a typical Han character in the same font.
<p>Whether fullwidth colon punctuation and fullwidth dot punctuation should
be considered fullwidth closing punctuation or fullwidth middle dot
@@ -3891,10 +3922,6 @@
standard convention is often not followed.</p>
</div>
- <p>When creating extra spacing, the added width does not correspond to the
- insertion of additional space characters, but instead to the width
- increment of existing glyphs.
-
<p>This property is additive with the ‘<a href="#word-spacing0"><code
class=property>word-spacing</code></a>’ and ‘<a
href="#letter-spacing0"><code
@@ -3907,11 +3934,11 @@
‘<a href="#word-spacing0"><code
class=property>word-spacing</code></a>’.
- <p>This property applies only to the same inline element context, and can
- apply across elements if in the same inline element context.
-
- <p>At element boundaries, the font size of the extra spacing is given by
- and rendered within the innermost element that contains the boundary.
+ <p>At element boundaries, the amount of extra spacing introduced between
+ characters is determined by and rendered within the innermost element that
+ contains the boundary. If the extra spacing is applied to a particular
+ glyph, then the spacing is determined by the innermost element containing
+ that glyph.
<p>Support for this property is <em>optional</em>. It is strongly
recommended for UAs that wish to support CJK typography.
@@ -6915,9 +6942,6 @@
<li>text-spacing:ideograph-numeric, <a href="#ideograph-numeric"
title="text-spacing:ideograph-numeric"><strong>9.3.</strong></a>
- <li>text-spacing:keep-end, <a href="#space-end"
- title="text-spacing:keep-end"><strong>9.3.</strong></a>
-
<li>text-spacing:no-justify, <a href="#no-justify"
title="text-spacing:no-justify"><strong>9.3.</strong></a>
@@ -6927,6 +6951,9 @@
<li>text-spacing:punctuation, <a href="#punctuation"
title="text-spacing:punctuation"><strong>9.3.</strong></a>
+ <li>text-spacing:space-end, <a href="#space-end"
+ title="text-spacing:space-end"><strong>9.3.</strong></a>
+
<li>text-spacing:trim-end, <a href="#trim-end"
title="text-spacing:trim-end"><strong>9.3.</strong></a>
Index: Overview.src.html
===================================================================
RCS file: /sources/public/csswg/css3-text/Overview.src.html,v
retrieving revision 1.210
retrieving revision 1.211
diff -u -d -r1.210 -r1.211
--- Overview.src.html 19 Apr 2011 18:25:14 -0000 1.210
+++ Overview.src.html 20 Apr 2011 00:49:23 -0000 1.211
@@ -2650,76 +2650,104 @@
</tbody>
</table>
- <p>This property determines spacing between two characters classes.
- The spacing may either be created or trimmed.
+ <p>This property controls spacing between adjacent characters
+ within the same inline formatting context using a set of
+ character-class-based rules.
+ Such spacing can either be created between or trimmed from the
+ affected glyphs.
Values are defined as follows:</p>
<dl>
<dt><dfn title="text-spacing:normal">normal</dfn></dt>
- <dd>Trim (kern) the blank half of fullwidth closing punctuation at
- the end of each line if it does not otherwise fit prior to
- justification.</dd>
- <!--
- <dd>Equivalent to ''space-start allow-end justify''.</dd>
- -->
+ <dd>Specifies the baseline behavior (defined below).
+ <!-- Equivalent to ''space-start allow-end justify'' -->
<dt><dfn title="text-spacing:trim-start">trim-start</dfn></dt>
- <dd>Trim (kern) the blank half of fullwidth opening punctuation at
- the beginning of each line. </dd>
+ <dd>Set fullwidth opening punctuation flush at the start of each
+ line. The UA must trim the blank half of fullwidth punctuation
+ glyphs if necessary.
<!--
<dt><dfn title="text-spacing:space-start">space-start</dfn></dt>
- <dd>Do not trim the blank half of fullwidth opening punctuation at
- the beginning of each line.</dd>
+ <dd>Set fullwidth opening punctuation at full width at the start
+ of each line. The UA must blank space to fullwidth
+ punctuation if they are not already full width.
-->
<!--
<dt><dfn title="text-spacing:allow-end">allow-end</dfn></dt>
- <dd>Trim (kern) the blank half of fullwidth closing punctuation at
- the end of each line if it does not otherwise fit prior to
- justification.</dd>
+ <dd>Set fullwidth closing punctuation flush at the end of each
+ line if it does not otherwise fit prior to justification.
+ The UA must trim the blank half of fullwidth punctuation
+ glyphs if necessary.
-->
<dt><dfn title="text-spacing:trim-end">trim-end</dfn></dt>
- <dd>Trim (kern) the blank half of fullwidth closing punctuation at
- the end of each line.</dd>
- <dt><dfn title="text-spacing:keep-end">space-end</dfn></dt>
- <dd>Do not trim the blank half of fullwidth closing punctuation at
- the end of each line. </dd>
- <dt><dfn title="text-spacing:no-justify">no-justify</dfn></dt>
- <dd>The blank portions of fullwidth punctuation must not be trimmed
- during the justification process. (If this value is not specified,
- the justification process may trim the blank portions of fullwidth
- punctuation glyphs.)
- <span class="note">
- An example of compression rules is given for Japanese in
- 3.8 Line Adjustment in [[JLREQ]].</span>
- </dd>
+ <dd>Set fullwidth closing punctuation flush at the end of each
+ line. The UA must trim the blank half of fullwidth punctuation
+ glyphs if necessary.</dd>
+ <dt><dfn title="text-spacing:space-end">space-end</dfn></dt>
+ <dd>Set fullwidth opening punctuation at full width at the start
+ of each line. The UA must add blank space to fullwidth
+ punctuation if they are not already full width.</dd>
<dt><dfn title="text-spacing:ideograph-alpha">ideograph-alpha</dfn></dt>
<dd>Creates 1/4em extra spacing between runs of ideographic letters and
- non-ideographic letters, such as Latin-based, Cyrillic, Greek, Arabic or Hebrew.
+ non-ideographic letters, such as Latin-based, Cyrillic, Greek,
+ Arabic or Hebrew.
+ Unless ''no-justify'' is also specified, this autospacing may
+ be altered by the justification process.
<span class="note">A commonly used algorithm for determining this
behavior is specified in [[JLREQ]]</span>
</dd>
<dt><dfn title="text-spacing:ideograph-numeric">ideograph-numeric</dfn></dt>
<dd>Creates 1/4em extra spacing between runs of ideographic letters and
non-ideographic numeric glyphs.
+ Unless ''no-justify'' is also specified, this autospacing may
+ be altered by the justification process.
<span class="note">A commonly used algorithm for determining this
behavior is specified in [[JLREQ]]</span>
</dd>
<dt><dfn title="text-spacing:punctuation">punctuation</dfn>
<dd>Creates extra non-breaking spacing around punctuation as required by
- language-specific typographic conventions. For example, if the
+ language-specific typographic conventions. In CSS3, if the
element's content language is French, narrow no-break space (U+202F)
- and no-break space (U+00A0) should be inserted where required by
+ and no-break space (U+00A0) is be inserted where required by
<a href="http://unicode.org/udhr/n/notes_fra.html">French typographic
guidelines</a>.
+ Otherwise this value has no effect. However future specifications
+ may add automatic spacing behavior for other languages.
+ <dt><dfn title="text-spacing:no-justify">no-justify</dfn></dt>
+ <dd>Justification may not alter text-spacing. (If this value is not
+ specified, the justification process may alter autospacing.)
+ <span class="note">
+ An example of compression rules is given for Japanese in
+ 3.8 Line Adjustment in [[JLREQ]].</span>
+ </dd>
</dl>
- <p>In all cases, the UA must trim (kern) the blank half of fullwidth
- opening punctuation if its previous adjacent character is a
- fullwidth opening punctuation, fullwidth middle dot punctuation,
- fullwidth closing punctuation, or ideographic space (U+3000).
- It must also trim (kern) the blank half of fullwidth closing
- punctuation if its next adjacent character is a fullwidth closing
- punctuation, fullwidth middle dot punctuation, or ideographic
- space (U+3000).</p>
+ <p>In the baseline behavior the UA must:
+ <ul>
+ <li>Set fullwidth opening punctuation at full width at the start
+ of each line. (This can require adding space to punctuation glyphs.)
+ This behavior can be overridden by specifying ''trim-start''.
+ <li>Set fullwidth closing punctuation flush at the end of each
+ line if it does not otherwise fit prior to justification.
+ (This can require trimming the blank half of fullwidth punctuation
+ glyphs.) This behavior can be overridden by specifying ''space-end''
+ or ''trim-end''.
+ <li>Set fullwidth opening punctuation at half width if the previous
+ character is a fullwidth opening punctuation, fullwidth middle dot
+ punctuation, fullwidth closing punctuation, or ideographic space
+ (U+3000). Else set it at full width and, unless ''no-justify'' is
+ specified, allow justification to alter this spacing.
+ <li>Set fullwidth closing punctuation at half width if the previous
+ character is a fullwidth closing punctuation, fullwidth middle dot
+ punctuation, or ideographic space (U+3000). Else set it at full
+ width and, unless ''no-justify'' is specified, allow justification
+ to alter this spacing.
+ </ul>
+
+ <p>Depending on the font system, text-spacing may require either
+ trimming (kerning) the blank half of fullwidth punctuation glyphs
+ (if they must be set flush / at half width), or adding 1/2em of
+ space to the glyphs (if they must be set at full width). When set
+ at full width</p>
<div class="example">
<p>The following example table lists the punctuation pairs affected by
@@ -2824,12 +2852,10 @@
</dd>
</dl>
- <p>Fullwidth opening and closing punctuation must not be trimmed if the
- glyph is not actually fullwidth.
- This includes the case where the glyph is not fullwidth
- as a result of the kerning in the font.
- A fullwidth glyph is one that has the
- same advance width as a typical Han character in the same font.</p>
+ <p>Fullwidth punctuation must not be trimmed if the glyph is not actually
+ fullwidth. This includes the case where the glyph is not fullwidth
+ as a result of the kerning in the font. A fullwidth glyph is one that
+ has the same advance width as a typical Han character in the same font.</p>
<p>Whether fullwidth colon punctuation and fullwidth dot punctuation should
be considered fullwidth closing punctuation or fullwidth middle dot
@@ -2868,20 +2894,16 @@
standard convention is often not followed.</p>
</div>
- <p>When creating extra spacing, the added width does not correspond to
- the insertion of additional space characters, but instead to the width
- increment of existing glyphs.</p>
-
<p>This property is additive with the 'word-spacing' and 'letter-spacing'
properties. That is, the amount of spacing contributed by the
'letter-spacing' setting (if any) is added to the spacing created by
'text-spacing'. The same applies to 'word-spacing'.
- <p>This property applies only to the same inline element context,
- and can apply across elements if in the same inline element context.</p>
-
- <p>At element boundaries, the font size of the extra spacing
- is given by and rendered within the innermost element that contains the boundary.</p>
+ <p>At element boundaries, the amount of extra spacing introduced
+ between characters is determined by and rendered within the innermost
+ element that contains the boundary. If the extra spacing is applied
+ to a particular glyph, then the spacing is determined by the innermost
+ element containing that glyph.
<p>Support for this property is <em>optional</em>. It is strongly
recommended for UAs that wish to support CJK typography.</p>
Received on Wednesday, 20 April 2011 00:49:28 UTC