Attempt to address Aharon's concerns about unicode-bidi: plaintext in <http://lists.w3.org/Archives/Public/public-i18n-bidi/2012JanMar/0040.html>

Author: fantasai

css3-text/Overview.html

@@ -32,14 +32,14 @@
 
    <h1>CSS Text Level 3</h1>
 
-   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 26 March 2012</h2>
+   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 27 March 2012</h2>
 
    <dl>
     <dt>This version:
 
     <dd><a href="http://dev.w3.org/csswg/css3-text/">$Date$ (CVS
      $Revision$)</a> <!--
-    <dd><a href="http://www.w3.org/TR/2012/WD-css3-text-20120326/">http://www.w3.org/TR/2012/WD-css3-text-20120326/</a></dd>
+    <dd><a href="http://www.w3.org/TR/2012/WD-css3-text-20120327/">http://www.w3.org/TR/2012/WD-css3-text-20120327/</a></dd>
   -->
 
 
@@ -1978,15 +1978,15 @@ <h3 id=text-align><span class=secno>7.1. </span> Text Alignment: the
    href="http://dev.w3.org/csswg/css3-text/#white-space-rules">white space
    processing rules</a>.
 
-  <p>The start and end edges of line boxes are determined by the inline base
-   direction per "paragraph", where in this case the "paragraph" is all
-   consecutive line boxes not separated by a forced line break or block
-   boundary. In most cases, this means referring to the &lsquo;<code
-   class=property>direction</code>&rsquo; property of the containing block.
-   In the case of &lsquo;<code class=css>unicode-bidi:
-   plaintext</code>&rsquo;, however, this uses the implied inline base
-   direction of the "paragraph" (i.e. the base direction that is used for
-   bidi reordering).
+  <p>The start and end edges of a line box are determined by the inline base
+   direction of the "bidi paragraph" to which it belongs. In most cases, this
+   means using the containing block's computed &lsquo;<code
+   class=property>direction</code>&rsquo;. However if containing block has
+   &lsquo;<code class=css>unicode-bidi: plaintext</code>&rsquo; <a
+   href="#CSS3-WRITING-MODES"
+   rel=biblioentry>[CSS3-WRITING-MODES]<!--{{!CSS3-WRITING-MODES}}--></a>,
+   the inline base direction of its line boxes will be determined by the bidi
+   paragraphs it contains.
 
   <div class=example>
    <p>In the following example, every other line is right-aligned:</p>

css3-text/Overview.src.html

@@ -1378,13 +1378,12 @@ <h3 id="text-align">
       <a href="http://dev.w3.org/csswg/css3-text/#white-space-rules">white
       space processing rules</a>.
 
-    <p>The start and end edges of line boxes are determined by the inline base
-      direction per "paragraph", where in this case the "paragraph" is all
-      consecutive line boxes not separated by a forced line break or block
-      boundary. In most cases, this means referring to the 'direction' property
-      of the containing block. In the case of ''unicode-bidi: plaintext'',
-      however, this uses the implied inline base direction of the "paragraph"
-      (i.e. the base direction that is used for bidi reordering).
+    <p>The start and end edges of a line box are determined by the inline base
+      direction of the "bidi paragraph" to which it belongs. In most cases,
+      this means using the containing block's computed 'direction'. However if
+      containing block has ''unicode-bidi: plaintext'' [[!CSS3-WRITING-MODES]],
+      the inline base direction of its line boxes will be determined by the bidi
+      paragraphs it contains.
 
     <div class="example">
       <p>In the following example, every other line is right-aligned:</p>

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 26 March 2012</h2>
+   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 27 March 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-20120326/">http://www.w3.org/TR/2012/ED-css3-writing-modes-20120326/</a>
+    <dd><a href="http://www.w3.org/TR/2012/WD-css3-writing-modes-20120327/">http://www.w3.org/TR/2012/ED-css3-writing-modes-20120327/</a>
 -->
 
 
@@ -555,9 +555,10 @@ <h2 id=text-direction><span class=secno>2. </span> Inline Direction and
    class=property>direction</code></a>&rsquo; and &lsquo;<a
    href="#unicode-bidi0"><code class=property>unicode-bidi</code></a>&rsquo;
    properties should in most cases be used only to map bidi information in
-   the markup to its corresponding CSS styles. If a document language
+   the markup to its corresponding CSS styles. <strong>If a document language
    provides markup features to control bidi, authors and users should use
-   those features and not specify CSS rules to override them.
+   those features instead</strong> and not specify CSS rules to override
+   them.
 
   <p>The HTML 4 specification (<a href="#HTML401"
    rel=biblioentry>[HTML401]<!--{{HTML401}}--></a>, section 8.2) defines
@@ -763,24 +764,16 @@ <h3 id=unicode-bidi><span class=secno>2.2. </span> Embeddings and
    <dt><dfn id=plaintext>plaintext</dfn>
 
    <dd>
-    <p>For the purposes of the Unicode bidirectional algorithm, the base
-     directionality of each bidi paragraph for which the element forms the
-     containing block is determined not by the element's computed &lsquo;<a
-     href="#direction0"><code class=property>direction</code></a>&rsquo; as
-     usual, but by following the heuristic in rules P2 and P3 of the Unicode
-     bidirectional algorithm. For inline elements, this value behaves as for
-     &lsquo;<a href="#isolate"><code class=css>isolate</code></a>&rsquo;,
-     except, as with block containers, the base directionality is determined
-     by following the Unicode heuristic instead of by using the &lsquo;<a
-     href="#direction0"><code class=property>direction</code></a>&rsquo;
-     value. <span class=note>Note that &lsquo;<a href="#unicode-bidi0"><code
-     class=property>unicode-bidi</code></a>&rsquo; does not affect the
-     &lsquo;<a href="#direction0"><code
-     class=property>direction</code></a>&rsquo; property even in the case of
-     &lsquo;<a href="#plaintext"><code class=css>plaintext</code></a>&rsquo;,
-     and thus does not affect &lsquo;<a href="#direction0"><code
-     class=property>direction</code></a>&rsquo;-dependent layout
-     calculations.</span>
+    <p>This value behaves as &lsquo;<a href="#isolate"><code
+     class=css>isolate</code></a>&rsquo; except that for the purposes of the
+     Unicode bidirectional algorithm, the base directionality of each bidi
+     paragraph immediately contained by the element is determined not by the
+     element's computed &lsquo;<a href="#direction0"><code
+     class=property>direction</code></a>&rsquo; as usual, but by following
+     the heuristic in rules P2 and P3 of the Unicode bidirectional algorithm.
+     An element immediately contains a bidi paragraph if it is a block
+     container or bidi-isolating inline and no other such elements intervene
+     between it and the bidi paragraph.
   </dl>
 
   <p class=note>Because the &lsquo;<a href="#unicode-bidi0"><code
@@ -792,6 +785,14 @@ <h3 id=unicode-bidi><span class=secno>2.2. </span> Embeddings and
    best used on blocks and inlines that do not contain any block-level
    structures.
 
+  <p class=note>Note that &lsquo;<a href="#unicode-bidi0"><code
+   class=property>unicode-bidi</code></a>&rsquo; does not affect the
+   &lsquo;<a href="#direction0"><code
+   class=property>direction</code></a>&rsquo; property even in the case of
+   &lsquo;<a href="#plaintext"><code class=css>plaintext</code></a>&rsquo;,
+   and thus does not affect &lsquo;<a href="#direction0"><code
+   class=property>direction</code></a>&rsquo;-dependent layout calculations.
+
   <p>The final order of characters within in each bidi paragraph is the same
    as if the bidi control codes had been added as described above, markup had
    been stripped, and the resulting character sequence had been passed to an

css3-writing-modes/Overview.src.html

@@ -246,11 +246,11 @@ <h2 id="text-direction">
 
   <p>Because the base directionality of a text depends on the structure and
     semantics of the document, the 'direction' and 'unicode-bidi' properties
-    should in most cases be
-    used only to map bidi information in the markup to its corresponding
-    CSS styles. If a document language provides markup features to control
-    bidi, authors and users should use those features and not specify CSS
-    rules to override them.</p>
+    should in most cases be used only to map bidi information in the markup
+    to its corresponding CSS styles.
+    <strong>If a document language provides markup features to control
+    bidi, authors and users should use those features instead</strong> and not
+    specify CSS rules to override them.</p>
 
   <p>The HTML 4 specification ([[HTML401]], section 8.2) defines
     bidirectionality behavior for HTML elements. The HTML 4 specification
@@ -413,18 +413,14 @@ <h3 id="unicode-bidi">
       ltr'', or RLO (U+202E), for ''direction: rtl'', at the start of the
       element and a PDF (U+202C) at the end of the element.</dd>
     <dt><dfn>plaintext</dfn></dt>
-    <dd><p>For the purposes of the Unicode bidirectional algorithm, the
-      base directionality of each bidi paragraph for which the element
-      forms the containing block is determined not by the element's
-      computed 'direction' as usual, but by following the heuristic in
-      rules P2 and P3 of the Unicode bidirectional algorithm.
-      For inline elements, this value behaves as for ''isolate'',
-      except, as with block containers, the base directionality is
-      determined by following the Unicode heuristic instead of by using
-      the 'direction' value. <span class="note">Note that 'unicode-bidi'
-      does not affect the 'direction' property even in the case of
-      ''plaintext'', and thus does not affect 'direction'-dependent
-      layout calculations.</span>
+    <dd><p>This value behaves as ''isolate'' except that for the purposes of
+      the Unicode bidirectional algorithm, the base directionality of each
+      bidi paragraph immediately contained by the element is determined not
+      by the element's computed 'direction' as usual, but by following the
+      heuristic in rules P2 and P3 of the Unicode bidirectional algorithm.
+      An element immediately contains a bidi paragraph if it is a block
+      container or bidi-isolating inline and no other such elements intervene
+      between it and the bidi paragraph.
   </dl>
 
   <p class=note>Because the 'unicode-bidi' property does not inherit,
@@ -433,6 +429,10 @@ <h3 id="unicode-bidi">
   used on blocks and inlines that do not contain any block-level
   structures.
 
+  <p class=note>Note that 'unicode-bidi' does not affect the 'direction'
+    property even in the case of ''plaintext'', and thus does not affect
+    'direction'-dependent layout calculations.</span>
+
   <p>The final order of characters within in each bidi paragraph is the
     same as if the bidi control codes had been added as described above,
     markup had been stripped, and the resulting character sequence had