[CSS22] Added change s.9.9.1: 'position: fixed' now *always* establishes a new stacking context, unlike 'position: absolute', where it depends on 'z-index'. New text still needs to be coordinated with draft of css3-positioning.

Author: bert-github

css2/changes.src

@@ -909,7 +909,30 @@ term
     <!-- Status: edited, but the WG still needs to validate the text -->
     <!-- http://lists.w3.org/Archives/Public/www-style/2014Jul/0162.html -->
 
+   <li id=s.9.9.1 class=change>
+    <p><span class=updated>[2015-07-01]</span> An element with
+    'position: fixed', unlike one with 'position: absolute',
+    <em>always</em> establishes a new stacking context. (This is
+    different from 'position: absolute', where 'z-index' determines if
+    the element establishes a stacking context.)
 
+    <p>Change the definition of 'auto' in <a
+    href="visuren.html#z-index" >&ldquo;9.9.1 Specifying the stack
+    level: the 'z-index' property&rdquo;</a> as follows:
+
+    <blockquote>
+     <dl>
+      <dt><strong>auto</strong> <dd>The stack level of the generated
+       box in the current stacking context is 0. <del>The box does not
+       establish a new stacking context unless it is the root
+       element.</del> <ins>[TBD] <!-- If the box has 'position: fixed'
+       or if it is the root, it establishes a new stacking
+       content. --></ins>
+     </dl>
+    </blockquote>
+
+    <!-- Status: not edited, waiting for concrete text -->
+    <!-- https://lists.w3.org/Archives/Public/www-style/2015Jul/0032.html -->
 
   </ul>