[css-pseudo-4] Allow U+0020 and U+00A0 in ::first-letter #9413

Author: fantasai

css-pseudo-4/Overview.bs

@@ -430,17 +430,16 @@ First Letters and Associated Punctuation</h4>
       that follows the [=first letter=].
     <li>
       Any intervening typographic space--
-      i.e. characters that belong to the <code>Zs</code> Unicode general category [[!UAX44]]
+      i.e. characters that belong to the <code>Zs</code> Unicode general category [[!UAX44]]--
       <em>other than</em>
-      U+3000 IDEOGRAPHIC SPACE or
-      any <a spec=css-text-3>word-separator characters</a>
+      U+3000 IDEOGRAPHIC SPACE.
   </ul>
 
   <div class="note">
     Informally, the [=first-letter text=]’s pattern here
     can be roughly
-    (ignoring the exclusions from <code>Zs</code>)
-    represented as the regular expression
+    (ignoring the exclusion from <code>Zs</code>)
+    represented as a “regular expression”
     <code highlight="bnf" style="font-family: inherit">
     (P (Zs|P)*)? (L&#x7c;N|S) ((Zs|P−(Ps|Pd))* (P−(Ps|Pd))?</code>--
     or, alternatively,
@@ -1883,7 +1882,9 @@ Changes</h2>
        and <a href="https://github.com/w3c/csswg-drafts/issues/10213">10213</a>)
     <li>Added ''::details-content'' pseudo-element
       (<a href="https://github.com/w3c/csswg-drafts/pull/10379">Issue 10379</a>)
-    <li>Renamed ''::postfix'' to ''::suffix''>
+    <li>Allow space and no-break space to be part of ''::first-letter''.
+      (<a href="https://github.com/w3c/csswg-drafts/issues/9413">Issue 9413</a>)
+    <li>Renamed ''::postfix'' to ''::suffix''.
       (Issue <a href="https://github.com/w3c/csswg-drafts/issues/11949">Issue 11949</a>)
     <li>Excluded inline layout properties from ''::placeholder''.
       (<a href="https://github.com/w3c/csswg-drafts/issues/5379">Issue 5379</a>)