[css-text-3] Allow one-side-ambiguous segment transformation to drop segment break if language context is CJY. w3c#337 <https://lists.w3.org/Archives/Public/www-style/2016Oct/0068.html>

Author: fantasai

css-text-3/Overview.bs

@@ -669,6 +669,12 @@ Languages and Typesetting</h4>
           the character before and after the segment break is <code>F</code>,
           <code>W</code>, or <code>H</code> (not <code>A</code>),
           and neither side is Hangul, then the segment break is removed.
+        <li>Otherwise, if the <a>East Asian Width property</a> [[!UAX11]] of either
+          the character before or after the segment break is <code>A</code>
+          and that character’s <a>content language</a> is Chinese, Japanese, or Yi,
+          and the character on the other side of the segment break is
+          <code>F</code>, <code>W</code>, or <code>H</code>,
+          and not Hangul, then the segment break is removed.
         <li>Otherwise, the segment break is converted to a space (U+0020).
       </ul>
 
@@ -2385,6 +2391,7 @@ Changes</h2>
     <li>For ''word-break: break-all'', switched to UAX14 notion of “letters”,
         since that handles symbols better.
     <li>Added ''line-break: anywhere''.
+    <li>Tweaked handling of Ambiguous characters during <a href="#line-break-transform">segment break transformation</a> to respond to language context.
   </ul>
 
   <h3 class="no-num" id="changes-2013">