[css-text-3] Include all letters in 'word-break' definitions, not just those assigned to letterlike UAX14 classes. #4781

Author: fantasai

css-text-3/Overview.bs

@@ -2357,7 +2357,7 @@ Text Processing</h3>
     <p>Note: Further information on line breaking conventions can be found in
       [[JLREQ]] and [[JIS4051]] for Japanese,
       [[CLREQ]] and [[ZHMARK]] for Chinese, and
-      in [[!UAX14]] for all scripts in Unicode.
+      in [[UAX14]] for all scripts in Unicode.
       See also the
       <a href="https://www.w3.org/International/">Internationalization Working Group</a>’s
       <a href="https://www.w3.org/TR/typography/#blocks_paragraphs">Typography Index</a> [[TYPOGRAPHY]]
@@ -2657,6 +2657,7 @@ Line Breaking Details</h3>
         any <a>typographic character units</a> resolving to the
         <code>NU</code> (“numeric”), <code>AL</code> (“alphabetic”), or <code>SA</code> (“Southeast Asian”)
         line breaking classes [[!UAX14]]
+        and all <a>typographic letter units</a> regardless of line breaking class
         are instead treated as <code>ID</code> (“ideographic characters”)
         for the purpose of line-breaking.
         Hyphenation is not applied.
@@ -5776,8 +5777,8 @@ Changes</h2>
     <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.
+    <li>For ''word-break: break-all'', included non-letters that are treated as letter-like in [[UAX14]]
+        to handle symbols better.
     <li>Added ''line-break: anywhere'' and ''overflow-wrap: anywhere''.
     <li>Tweaked handling of Ambiguous characters during <a href="#line-break-transform">segment break transformation</a> to respond to language context.
   </ul>