Edits to vertical font stuff, attepting to address <http://lists.w3.org/Archives/Public/www-style/2012Apr/0650.html>

Author: fantasai

css3-writing-modes/Overview.html

@@ -32,15 +32,15 @@
 
    <h1>CSS Writing Modes Module Level 3</h1>
 
-   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 25 April 2012</h2>
+   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 26 April 2012</h2>
 
    <dl>
     <dt>This version:
 
     <dd><a
      href="http://dev.w3.org/csswg/css3-writing-modes/">http://dev.w3.org/csswg/css3-writing-modes/</a>
      <!--
-    <dd><a href="http://www.w3.org/TR/2012/WD-css3-writing-modes-20120425/">http://www.w3.org/TR/2012/ED-css3-writing-modes-20120425/</a>
+    <dd><a href="http://www.w3.org/TR/2012/WD-css3-writing-modes-20120426/">http://www.w3.org/TR/2012/ED-css3-writing-modes-20120426/</a>
 -->
 
 
@@ -1823,14 +1823,17 @@ <h3 id=text-orientation><span class=secno>5.1. </span> Orienting Text: the
   <h4 id=vertical-font-features><span class=secno>5.1.1. </span> Applying
    Vertical Font Features</h4>
 
-  <p>Vertical typesetting features such as vertical metrics and glyph
-   alternates are used to set upright characters in &lsquo;<a
+  <p>Vertical font metrics are used to set upright characters in &lsquo;<a
    href="#mixed-right"><code class=css>mixed-right</code></a>&rsquo; and
    &lsquo;<a href="#upright"><code class=css>upright</code></a>&rsquo; modes.
-   The UA must synthesize vertical font metrics for any such characters that
-   do not have any. (This specification does not define heuristics for
-   synthesizing such metrics.) Any shaping characters from horizontal scripts
-   that are typeset upright are shaped in their isolated forms.
+   The UA must synthesize vertical font metrics for fonts that lack them.
+   (This specification does not define heuristics for synthesizing such
+   metrics.) Additionally, font features (such as alternate glyphs) intended
+   for use in vertical typesetting must be used. (E.g. the OpenType
+   &lsquo;<code class=css>vert</code>&rsquo; feature must be enabled.)
+
+  <p>Characters from horizontal shaping scripts (such as Arabic) are shaped
+   in their isolated forms when typeset upright.
 
   <p>For sideways characters in &lsquo;<a href="#mixed-right"><code
    class=css>mixed-right</code></a>&rsquo; and &lsquo;<a
@@ -1843,9 +1846,13 @@ <h4 id=vertical-font-features><span class=secno>5.1.1. </span> Applying
    class=css>sideways</code></a>&rsquo;, &lsquo;<a
    href="#sideways-right"><code class=css>sideways-right</code></a>&rsquo;,
    and &lsquo;<a href="#sideways-left"><code
-   class=css>sideways-left</code></a>&rsquo; modes, text is typeset with
-   horizontal font settings. Vertical metrics and glyph variants are
-   <em>not</em> used. <!-- random notes
+   class=css>sideways-left</code></a>&rsquo; modes, text is typeset using
+   horizontal font metrics and the normal set of features used for horizontal
+   text runs. Vertical metrics and vertical glyph variations are <em>not</em>
+   used.
+
+  <p class=issue>This section needs additional reworking. Suggestions are
+   welcome. <!-- random notes
   Property to customize text-orientation (and line breaking class) of various
   characters (yes, the name is horrible, we need a better one):
     text-symbolize: latin ||

css3-writing-modes/Overview.src.html

@@ -1288,21 +1288,26 @@ <h3 id="text-orientation">
 <h4 id=vertical-font-features>
 Applying Vertical Font Features</h4>
 
-  <p>Vertical typesetting features such as vertical metrics and glyph alternates
+  <p>Vertical font metrics
     are used to set upright characters in ''mixed-right'' and ''upright'' modes.
-    The UA must synthesize vertical font metrics for any such characters
-    that do not have any.
+    The UA must synthesize vertical font metrics for fonts that lack them.
     (This specification does not define heuristics for synthesizing such metrics.)
-    Any shaping characters from horizontal scripts that are typeset upright are
-    shaped in their isolated forms.
+    Additionally, font features (such as alternate glyphs) intended
+    for use in vertical typesetting must be used.
+    (E.g. the OpenType ''vert'' feature must be enabled.)
+  <p>Characters from horizontal shaping scripts (such as Arabic)
+    are shaped in their isolated forms when typeset upright.
   <p>For sideways characters in ''mixed-right'' and ''upright'' modes, vertical
     typesetting features are not used.
     However, if the font has features or alternate metrics meant to be enabled
     for sideways text that is typeset in vertical lines,
     those features and tables are used.
   <p>In the ''sideways'', ''sideways-right'', and ''sideways-left'' modes,
-    text is typeset with horizontal font settings. Vertical metrics and
-    glyph variants are <em>not</em> used.
+    text is typeset using horizontal font metrics and the normal set of features
+    used for horizontal text runs.
+    Vertical metrics and vertical glyph variations are <em>not</em> used.
+
+  <p class=issue>This section needs additional reworking. Suggestions are welcome.
 
 <!-- random notes
   Property to customize text-orientation (and line breaking class) of various