[css3-text] Add issue wrt use of letter-spacing in justification.

Author: fantasai

css3-text/Overview.html

@@ -2597,7 +2597,7 @@ <h3 id=letter-spacing><span class=secno>8.2. </span> Tracking: the ‘<a
     <tr>
      <th>Computed value:
 
-     <td>an optimum value each consisting of either an absolute length or the
+     <td>an optimum value consisting of either an absolute length or the
       keyword ‘<code class=css>normal</code>’
   </table>
 
@@ -2621,6 +2621,14 @@ <h3 id=letter-spacing><span class=secno>8.2. </span> Tracking: the ‘<a
     may be implementation-dependent limits.
   </dl>
 
+  <p class=issue>CSS2.1 defines that ‘<a href="#letter-spacing0"><code
+   class=property>letter-spacing</code></a>’ values other than ‘<code
+   class=css>normal</code>’ forbid the adjustment of letter-spacing during
+   justification. This means that tracking can't be used in conjunction with,
+   e.g. CJK justification methods. However, allowing it would mean we need a
+   control for disabling it; German, for example, avoids letter-spacing for
+   justification because it's used for emphasis.
+
   <p>Letter-spacing must not be applied at the beginning or at the end of a
    line. The total letter spacing between two adjacent <a
    href="#character"><i>characters</i></a> (after bidi reordering) is given
@@ -3434,7 +3442,8 @@ <h3 class=no-num id=recent-changes> Changes from the <a
     href="#word-spacing0"><code class=property>word-spacing</code></a>’ to
     default missing values to ‘<code class=css>normal</code>’.
 
-    <li>Removed <var>&lt;string&gt;</var> value of 'text-align'.
+   <li>Removed <var>&lt;string&gt;</var> value of ‘<a
+    href="#text-align0"><code class=property>text-align</code></a>’.
   </ul>
 
   <p>Significant details updated:

css3-text/Overview.src.html

@@ -1994,7 +1994,7 @@ <h3 id="letter-spacing">
         <tr>
           <th>Computed&#160;value:</th>
           <td>an optimum value
-            each consisting of either an absolute length or the keyword ''normal''
+            consisting of either an absolute length or the keyword ''normal''
         </tr>
     </table>
 
@@ -2013,6 +2013,12 @@ <h3 id="letter-spacing">
         Values may be negative, but there may be implementation-dependent limits.
   </dl>
 
+    <p class="issue">CSS2.1 defines that 'letter-spacing' values other than ''normal''
+     forbid the adjustment of letter-spacing during justification.
+     This means that tracking can't be used in conjunction with, e.g. CJK justification methods.
+     However, allowing it would mean we need a control for disabling it;
+     German, for example, avoids letter-spacing for justification because it's used for emphasis.
+
     <p>Letter-spacing must not be applied at the beginning or at the end of a line.
        The total letter spacing between two adjacent <i>characters</i> (after bidi reordering) is given by and rendered
        within the innermost element that <em>contains</em> the boundary between the two <i>characters</i>.