[css-align] Make 'stretch' not stretch replaced block-level/abspos boxes. Add issue about this.

Author: tabatkins

css-align/Overview.html

@@ -1023,10 +1023,10 @@ <h3 id=justify-self-property><span class=secno>5.1. </span>
      used value of the offset properties are not adjusted to correct for the
      over-constraint.
 
-    <p class=note> The ‘<a href="#lsquostretchrsquo0"><code
-     class=css>stretch</code></a>’ keyword is equivalent to ‘<a
-     href="#lsquostartrsquo"><code class=css>start</code></a>’, since block
-     layout already stretches by default.
+    <p> The ‘<a href="#lsquostretchrsquo0"><code
+     class=css>stretch</code></a>’ value is equivalent to ‘<a
+     href="#lsquostartrsquo"><code class=css>start</code></a>’ on
+     block-level boxes.
 
    <dt>Absolutely-positioned Boxes:
 
@@ -1068,9 +1068,11 @@ <h3 id=justify-self-property><span class=secno>5.1. </span>
      used value of the offset properties are not adjusted to correct for the
      over-constraint.
 
-    <p class=issue> Make stretch work on replaced items? This requires
-     keeping ‘<a href="#lsquoautorsquo1"><code class=css>auto</code></a>’
-     as ‘<a href="#lsquoautorsquo1"><code class=css>auto</code></a>’.
+    <p> The ‘<a href="#lsquostretchrsquo0"><code
+     class=css>stretch</code></a>’ keyword is equivalent to ‘<a
+     href="#lsquostartrsquo"><code class=css>start</code></a>’ on replaced
+     absolutely-positioned boxes. (This is because CSS 2.1 does not stretch
+     replaced elements to fit into fixed offsets.)
 
    <dt>Grid Items:
 
@@ -1081,15 +1083,21 @@ <h3 id=justify-self-property><span class=secno>5.1. </span>
 
     <p>The <a href="#alignment-container"><i>alignment container</i></a> is
      the <i>grid cell</i>. The <a href="#alignment-subject"><i>alignment
-     subject</i></a> is <i>grid item</i>‘<code class=css>s margin box. The
-     default <a href="#overflow-alignment"><i>overflow alignment</i></a> is
-     </code>’‘<a href="#lsquotruersquo"><code
-     class=property>true</code></a>’‘<code class=css>. </code>
+     subject</i></a> is <i>grid item</i>’s margin box. The default <a
+     href="#overflow-alignment"><i>overflow alignment</i></a> is ‘<a
+     href="#lsquotruersquo"><code class=css>true</code></a>’.
   </dl>
 
+  <p class=issue> Should we make ‘<a href="#lsquostretchrsquo0"><code
+   class=css>stretch</code></a>’ actually work on block-level/abspos
+   replaced boxes? To maintain legacy compat, this requires adding a new
+   value (named ‘<code class=css>normal</code>’?) which has the current
+   behavior of stretching non-replaced boxes and start-aligning replaced
+   ones.
+
   <div class=example>
    <p>The effect of these rules is that an auto-sized block-level table, for
-    example, can be aligned while still having side margins. If the table’s
+    example, can be aligned while still having side margins. If the table's
     max-content size is narrower than its containing block, then it is
     shrink-wrapped to that size and aligned as specified. If the table's
     max-content size is wider, then it fills its containing block, and the

css-align/Overview.src.html

@@ -567,9 +567,9 @@ <h3 id='justify-self-property'>
         are ignored in favor of alignment as specified here
         and the used value of the offset properties are not adjusted to correct for the over-constraint.
 
-      <p class="note">
-        The ''stretch'' keyword is equivalent to ''start'',
-        since block layout already stretches by default.
+      <p>
+        The ''stretch'' value is equivalent to ''start'' on block-level boxes.
+
 
     <dt>Absolutely-positioned Boxes:
     <dd>
@@ -593,19 +593,24 @@ <h3 id='justify-self-property'>
         are ignored in favor of alignment as specified here
         and the used value of the offset properties are not adjusted to correct for the over-constraint.
 
-      <p class="issue">
-        Make stretch work on replaced items?
-        This requires keeping ''auto'' as ''auto''.
+      <p>
+        The ''stretch'' keyword is equivalent to ''start'' on replaced absolutely-positioned boxes.
+        (This is because CSS 2.1 does not stretch replaced elements to fit into fixed offsets.)
 
     <dt>Grid Items:
     <dd>
       <p>The 'justify-self' property applies along the grid's <i>row axis</i>.
 
       <p>The <i>alignment container</i> is the <i>grid cell</i>.
-        The <i>alignment subject</i> is <i>grid item</i>'s margin box.
+        The <i>alignment subject</i> is <i>grid item</i>’s margin box.
         The default <i>overflow alignment</i> is ''true''.
   </dl>
 
+  <p class='issue'>
+    Should we make ''stretch'' actually work on block-level/abspos replaced boxes?
+    To maintain legacy compat, this requires adding a new value (named ''normal''?)
+    which has the current behavior of stretching non-replaced boxes and start-aligning replaced ones.
+
   <div class="example">
     <p>The effect of these rules is that an auto-sized block-level table,
     for example, can be aligned while still having side margins.