[css-pseudo-4] Only allow word separators preceding first letter. #9413

Author: fantasai

css-pseudo-4/Overview.bs

@@ -421,24 +421,27 @@ First Letters and Associated Punctuation</h4>
     <li>
       All punctuation--
       i.e, characters that belong to the Punctuation (<code>P*</code>) <a>Unicode general category</a> [[!UAX44]]--
-      that precedes the [=first letter=].
+      that precedes the [=first letter=],
+      as well as any intervening typographic space--
+      characters belonging to the <code>Zs</code> Unicode general category [[!UAX44]]
+      <em>other than</em>
+      U+3000 IDEOGRAPHIC SPACE.
     <li>
       Any punctuation other than opening punctuation and dashes--
       i.e. characters that belong to the Punctuation (<code>P*</code>) <a>Unicode general category</a>,
       excluding Open Punctuation (<code>Ps</code>)
       and Dash Punctuation (<code>Pd</code>)--
-      that follows the [=first letter=].
-    <li>
-      Any intervening typographic space--
-      i.e. characters that belong to the <code>Zs</code> Unicode general category [[!UAX44]]--
+      that follows the [=first letter=],
+      as well as any intervening typographic space--
+      characters belonging to the <code>Zs</code> Unicode general category [[!UAX44]]
       <em>other than</em>
-      U+3000 IDEOGRAPHIC SPACE.
+      U+3000 IDEOGRAPHIC SPACE or a [=word separator=].
   </ul>
 
   <div class="note">
     Informally, the [=first-letter text=]’s pattern here
     can be roughly
-    (ignoring the exclusion from <code>Zs</code>)
+    (ignoring the exclusions 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>--
@@ -1882,7 +1885,8 @@ 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>Allow space and no-break space to be part of ''::first-letter''.
+    <li>Allow space and no-break space to be part of ''::first-letter''
+      when occuring before the [=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>)

css-text-3/Overview.bs

@@ -6057,7 +6057,7 @@ Word Spacing: the 'word-spacing' property</h3>
 	word-spacing/word-spacing-negative-value-001.html
 	</wpt>
 
-	<dfn id="word-separator" lt="word-separator character | word separator">Word-separator characters</dfn>
+	<dfn export id="word-separator" lt="word-separator character | word separator">Word-separator characters</dfn>
 	are [=typographic character units=]
 	whose primary purpose and general usage is to separate words.
 	In Unicode this includes

css-text-4/Overview.bs

@@ -9922,7 +9922,7 @@ Word Spacing: the 'word-spacing' property</h3>
 	word-spacing/word-spacing-negative-value-001.html
 	</wpt>
 
-	<dfn id="word-separator" lt="word-separator character | word separator">Word-separator characters</dfn>
+	<dfn export id="word-separator" lt="word-separator character | word separator">Word-separator characters</dfn>
 	are [=typographic character units=]
 	whose primary purpose and general usage is to separate words.
 	In Unicode this includes