[css-writing-modes] Clarify handling of white space at the start/end …

…of a TCY combination. #4139 see also thread at <https://lists.w3.org/Archives/Public/www-style/2018Aug/0019.html>.
w3c · Jul 21, 2019 · 53a5349 · 53a5349
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diff --git a/css-writing-modes-3/Overview.bs b/css-writing-modes-3/Overview.bs
@@ -2400,6 +2400,9 @@ Layout Rules</h4>
     but using the specified font settings),
     similar to the contents of an ''inline-block'' box
     with a [=horizontal writing mode=] and a 'line-height' of ''1em''.
+    Any [=document white space=] included at the start/end of the combined text
+    <em>is</em> [[css-text-3#white-space-processing|processed]] [[!CSS-TEXT-3]]
+    as at the start/end of such an inline block.
     The effective size of the composition is assumed to be 1em square;
     anything outside the square is not measured for layout purposes.
     The UA should center the glyphs horizontally and vertically within the measured 1em square.
@@ -2494,6 +2497,23 @@ Privacy and Security Considerations {#priv-sec}
         but not its computed value.
         Also, optionally allow propagating 'text-orientation' as well.
         (<a href="https://github.com/w3c/csswg-drafts/issues/3066">Issue 3066</a>)
+    <li>Clarified that white space within--
+        particularly at the start/end of--
+        a 'text-combine-upright' combined text sequence
+        is processed the same way as in an inline block.
+        (<a href="https://github.com/w3c/csswg-drafts/issues/4139">Issue 4139</a>)
+        <blockquote>
+          <p>When combining text as for ''text-combine-upright: all'',
+          the glyphs of the combined text are <a>bidi-isolated</a>
+          and composed horizontally
+          (ignoring 'letter-spacing' and any forced line breaks,
+          but using the specified font settings),
+          similar to the contents of an ''inline-block'' box
+          with a [=horizontal writing mode=] and a 'line-height' of ''1em''.
+          <ins>Any [=document white space=] included at the start/end of the combined text
+          <em>is</em> [[css-text-3#white-space-processing|processed]] [[!CSS-TEXT-3]]
+          as at the start/end of such an inline block.</ins>
+        </blockquote>
   </ul>
 
   <h3 class="no-num" id="changes-201712">

diff --git a/css-writing-modes-4/Overview.bs b/css-writing-modes-4/Overview.bs
@@ -2671,6 +2671,9 @@ Layout Rules</h4>
     but using the specified font settings),
     similar to the contents of an ''inline-block'' box
     with a [=horizontal writing mode=] and a 'line-height' of ''1em''.
+    Any [=document white space=] included at the start/end of the combined text
+    <em>is</em> [[css-text-3#white-space-processing|processed]] [[!CSS-TEXT-3]]
+    as at the start/end of such an inline block.
     The effective size of the composition is assumed to be 1em square;
     anything outside the square is not measured for layout purposes.
     The UA should center the glyphs horizontally and vertically within the measured 1em square.
@@ -2798,6 +2801,25 @@ Changes since the <a href="https://www.w3.org/TR/2018/CR-css-writing-modes-4-201
       Also, optionally allow propagating 'text-orientation' as well.
       This change was also applied to level 3.
       (<a href="https://github.com/w3c/csswg-drafts/issues/3066">Issue 3066</a>)
+    <li>
+      Clarified that white space within--
+      particularly at the start/end of--
+      a 'text-combine-upright' combined text sequence
+      is processed the same way as in an inline block.
+      (<a href="https://github.com/w3c/csswg-drafts/issues/4139">Issue 4139</a>)
+      This change was also applied to level 3.
+      <blockquote>
+        <p>When combining text as for ''text-combine-upright: all'',
+        the glyphs of the combined text are <a>bidi-isolated</a>
+        and composed horizontally
+        (ignoring 'letter-spacing' and any forced line breaks,
+        but using the specified font settings),
+        similar to the contents of an ''inline-block'' box
+        with a [=horizontal writing mode=] and a 'line-height' of ''1em''.
+        <ins>Any [=document white space=] included at the start/end of the combined text
+        <em>is</em> [[css-text-3#white-space-processing|processed]] [[!CSS-TEXT-3]]
+        as at the start/end of such an inline block.</ins>
+      </blockquote>
   </ul>
 
 <h3 id="additions">