Clarify the left/right values of text-align by linking to writing modes spec.

Author: fantasai

css3-text/Overview.html

@@ -1894,18 +1894,20 @@ <h3 id=text-align><span class=secno>7.1. </span> Text Alignment: the
    <dt><dfn id=left title="text-align:left">&lsquo;<code
     class=css>left</code>&rsquo;</dfn>
 
-   <dd>The inline contents are aligned to the left edge of the line box. (In
-    vertical writing modes, &lsquo;<code class=property>left</code>&rsquo;
-    aligns to the edge of the line box that would be the start edge for
-    left-to-right text.)
+   <dd>The inline contents are aligned to the <a
+    href="http://www.w3.org/TR/css3-writing-modes/#line-left">line left</a>
+    edge of the line box. (Note that in vertical writing modes, this will be
+    either the physical top or bottom.) <a href="#CSS3-WRITING-MODES"
+    rel=biblioentry>[CSS3-WRITING-MODES]<!--{{CSS3-WRITING-MODES}}--></a>
 
    <dt><dfn id=right title="text-align:right">&lsquo;<code
     class=css>right</code>&rsquo;</dfn>
 
-   <dd>The inline contents are aligned to the right edge of the line box. (In
-    vertical writing modes, &lsquo;<code class=property>right</code>&rsquo;
-    aligns to the edge of the line box that would be the end edge for
-    left-to-right text.)
+   <dd>The inline contents are aligned to the <a
+    href="http://www.w3.org/TR/css3-writing-modes/#line-right">line right</a>
+    edge of the line box. (Note that in vertical writing modes, this will be
+    either the physical top or bottom.) <a href="#CSS3-WRITING-MODES"
+    rel=biblioentry>[CSS3-WRITING-MODES]<!--{{CSS3-WRITING-MODES}}--></a>
 
    <dt><dfn id=center title="text-align:center">&lsquo;<code
     class=css>center</code>&rsquo;</dfn>

css3-text/Overview.src.html

@@ -1329,13 +1329,15 @@ <h3 id="text-align">
     <dt><dfn title="text-align:end">''end''</dfn></dt>
       <dd>The inline contents are aligned to the end edge of the line box.
     <dt><dfn title="text-align:left">''left''</dfn></dt>
-      <dd>The inline contents are aligned to the left edge of the line box.
-        (In vertical writing modes, 'left' aligns to the edge of the line box
-        that would be the start edge for left-to-right text.)</dd>
+      <dd>The inline contents are aligned to the
+        <a href="http://www.w3.org/TR/css3-writing-modes/#line-left">line left</a>
+        edge of the line box. (Note that in vertical writing modes, this will
+        be either the physical top or bottom.) [[CSS3-WRITING-MODES]]</dd>
     <dt><dfn title="text-align:right">''right''</dfn></dt>
-      <dd>The inline contents are aligned to the right edge of the line box.
-        (In vertical writing modes, 'right' aligns to the edge of the line box
-        that would be the end edge for left-to-right text.)</dd>
+      <dd>The inline contents are aligned to the 
+        <a href="http://www.w3.org/TR/css3-writing-modes/#line-right">line right</a>
+        edge of the line box. (Note that in vertical writing modes, this will
+        be either the physical top or bottom.) [[CSS3-WRITING-MODES]]</dd>
     <dt><dfn title="text-align:center">''center''</dfn></dt>
       <dd>The inline contents are centered within the line box.
     <dt><dfn title="text-align:justify">''justify''</dfn></dt>