[css-text] Only capitalize lowercase letters. <https://www.w3.org/mid/54FF0DDC.6000408@w3.org> <https://www.w3.org/mid/54FF0DDC.6000408@w3.org>

Author: fantasai

css-text/Overview.bs

@@ -316,7 +316,7 @@ Languages and Typesetting</h4>
       <dt><dfn>none</dfn></dt>
         <dd>No effects.</dd>
       <dt><dfn>capitalize</dfn></dt>
-        <dd>Puts the first <a>typographic letter unit</a> of each word in titlecase;
+        <dd>Puts the first <a>typographic letter unit</a> of each word, if lowercase, in titlecase;
           other characters are unaffected.</dd>
       <dt><dfn>uppercase</dfn></dt>
         <dd>Puts all <a>letters</a> in uppercase.
@@ -2328,6 +2328,7 @@ Changes</h2>
     <li>Made 'text-align' a shorthand of 'text-align-last' and the new 'text-align-all' property.
     <li>Removed dependence of 'text-align-last' on ''text-align: justify'',
         since the problem it solves is now solved by the shorthanding relationship.
+    <li>Qualified that only lowercase letters are titlecased for ''text-transform: capitalize''; uppercase letters remain unaffected.
     <li>For ''word-break: break-all'', switched to UAX14 notion of “letters”,
         since that handles symbols better.
   </ul>