Modified wording for resolution of containing block for positioned elements in a named flow

Author: vhardy

css3-regions/Overview.html

@@ -737,8 +737,16 @@ <h3 id=the-flow-into-property><span class=secno>4.1. </span>The &lsquo;<a
   </div>
 
   <p>The edges of the first region in a region chain associated with a named
-   flow establish the rectangle that is the initial containing block of the
-   named flow.
+   flow establish the rectangle that is the <a
+   href="http://www.w3.org/TR/CSS2/visudet.html#containing-block-details">containing
+   block</a> used for absolutely positioned elements in the name named flow
+   which do not have an ancestor with a &lsquo;<code
+   class=property>position</code>&rsquo; of &lsquo;<code
+   class=property>absolute</code>&rsquo;, &lsquo;<code
+   class=property>relative</code>&rsquo; or &lsquo;<code
+   class=property>fixed</code>&rsquo; (see <a href="#CSS21"
+   rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a>). That first region rectangle
+   is used as the containing block instead of the initial containing block.
 
   <p>The first region defines the <a
    href="http://www.w3.org/TR/css3-writing-modes/#writing-mode">writing
@@ -2008,6 +2016,9 @@ <h3 id="changes_from_June_09_2011"><span class=secno>10.1. </span>Changes
     <code>Document</code> interface, as per <a
     href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=15828">Bug
     15828</a>.
+
+   <li>Modified wording about containing block resolution for absolutely
+    positioned elements in a named flow.
   </ul>
 
   <h3 id="changes_from_June_09_2011"><span class=secno>10.2. </span>Changes

css3-regions/Overview.src.html

@@ -592,7 +592,11 @@ <h3 id="the-flow-into-property">The 'flow-into' property</h3>
     </div>
 
     <p>The edges of the first region in a region chain associated with a named flow establish 
-        the rectangle that is the initial containing block of the named flow.</p>
+        the rectangle that is the 
+        <a href="http://www.w3.org/TR/CSS2/visudet.html#containing-block-details">containing block</a> 
+        used for absolutely positioned elements in the name named flow which do not have an 
+        ancestor with a 'position' of 'absolute', 'relative' or 'fixed' (see [[!CSS21]]). That 
+        first region rectangle is used as the containing block instead of the initial containing block.</p>
 
     <p>The first region defines the <a href="http://www.w3.org/TR/css3-writing-modes/#writing-mode">writing mode</a> for the entire flow. The writing mode on subsequent regions is ignored.</p>
 
@@ -1718,6 +1722,8 @@ <h3 id="changes_from_June_09_2011">Changes from <a href="http://www.w3.org/TR/20
         <li>Added a name property to the <code>NamedFlow</code> interface. Added a <code>NamedFlowCollection</code>
             interface and added a <code>getNamedFlows</code> method on the <code>Document</code> interface, as
             per <a href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=15828">Bug 15828</a>.</li>
+        <li>Modified wording about containing block resolution for absolutely positioned elements in a 
+            named flow.</li>
     </ul>