[css-regions] Clarifying the containing model of regions as it applies to fixed

and absolutely positioned elements.

Author: ratan@microsoft.com

css-regions/Overview.html

@@ -12,7 +12,7 @@
    rel=dcterms.rights>
   <meta content="CSS Regions Module Level 1" name=dcterms.title>
   <meta content=text name=dcterms.type>
-  <meta content=2013-11-28 name=dcterms.date>
+  <meta content=2014-01-14 name=dcterms.date>
   <meta content="Vincent Hardy" name=dcterms.creator>
   <meta content="Rossen Atanassov" name=dcterms.creator>
   <meta content="Alan Stearns" name=dcterms.creator>
@@ -46,8 +46,8 @@
 
    <h1 id=css-regions-module>CSS Regions Module Level 1</h1>
 
-   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 28 November
-    2013</h2>
+   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 14 January
+    2014</h2>
 
    <dl>
     <dt>This version:
@@ -107,7 +107,7 @@ <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 28 November
    <!--begin-copyright-->
    <p class=copyright><a
     href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright"
-    rel=license>Copyright</a> © 2013 <a href="http://www.w3.org/"><abbr
+    rel=license>Copyright</a> © 2014 <a href="http://www.w3.org/"><abbr
     title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup> (<a
     href="http://www.csail.mit.edu/"><abbr
     title="Massachusetts Institute of Technology">MIT</abbr></a>, <a
@@ -751,22 +751,17 @@ <h3 id=the-flow-into-property><span class=secno>3.1. </span>The ‘<a
    content in the named flow as input, rather than the contents’ position
    in the DOM.
 
-  <p>The edges of the first <a href="#css-region">CSS Region</a> in a region
-   chain associated with a <a href="#named-flow0">named flow</a> 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 <a
-   href="#named-flow0">named flow</a> which do not have an ancestor with a
-   ‘<code class=property>position</code>’ of ‘<code
-   class=property>absolute</code>’, ‘<code
-   class=property>relative</code>’ or ‘<code
-   class=property>fixed</code>’ (see <a href="#ref-CSS21"
-   rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a>). That first <a
-   href="#css-region">CSS Region</a> rectangle is used as the containing
-   block instead of the initial containing block. This does not affect fixed
-   position elements in the <a href="#named-flow0">named flow</a> - they are
-   still positioned relative to the viewport or page area even if they have
-   been redirected to a named flow.
+  <p>Each <span>region</span> in a <a href="#region-chain0">region chain</a>
+   establishes a containing block for absolutely positioned elements in the
+   <a href="#named-flow0">named flow</a> (see <a href="#ref-CSS21"
+   rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a>). That first
+   <span>region</span> in a <a href="#region-chain0">region chain</a>
+   establishes the initial containing block for such absolutely positioned
+   elements. <span>Regions</span> don't establish a containing block for
+   fixed positioned elements in the <a href="#named-flow0">named flow</a>.
+   Such fixed positioned elements are still positioned relative to the
+   viewport or the page area even if they have been redirected into a named
+   flow.
 
   <p>The first region defines the principal <a
    href="http://www.w3.org/TR/css3-writing-modes/#writing-mode1">writing
@@ -3116,11 +3111,11 @@ <h3 class=no-num id=normative-references>Normative references</h3>
 
    <dt id=ref-DOM-LEVEL-3-EVENTS>[DOM-LEVEL-3-EVENTS]
 
-   <dd>Travis Leithead; et al. <a
-    href="http://www.w3.org/TR/2012/WD-DOM-Level-3-Events-20120906/"><cite>Document
-    Object Model (DOM) Level 3 Events Specification.</cite></a> 6 September
-    2012. W3C Working Draft. (Work in progress.) URL: <a
-    href="http://www.w3.org/TR/2012/WD-DOM-Level-3-Events-20120906/">http://www.w3.org/TR/2012/WD-DOM-Level-3-Events-20120906/</a>
+   <dd>Gary Kacmarcik; et al. <a
+    href="http://www.w3.org/TR/2013/WD-DOM-Level-3-Events-20131105/"><cite>Document
+    Object Model (DOM) Level 3 Events Specification.</cite></a> 5 November
+    2013. W3C Working Draft. (Work in progress.) URL: <a
+    href="http://www.w3.org/TR/2013/WD-DOM-Level-3-Events-20131105/">http://www.w3.org/TR/2013/WD-DOM-Level-3-Events-20131105/</a>
    </dd>
    <!---->
 

css-regions/Overview.src.html

@@ -544,25 +544,17 @@ <h3 id="the-flow-into-property">The 'flow-into' property</h3>
       in the DOM.
     </p>
 
-    <p>The edges of the first <span>CSS Region</span> in a region chain 
-      associated with a <span>named flow</span> 
-      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 <span>named flow</span> 
-      which do not have an ancestor 
-      with a 'position' of 'absolute', 'relative' or 'fixed' 
-      (see [[!CSS21]]). 
-      That first <span>CSS Region</span> rectangle is used 
-      as the containing block 
-      instead of the initial containing block. 
-      This does not affect 
-      fixed position elements 
-      in the <span>named flow</span> - 
-      they are still positioned relative 
-      to the viewport or page area even if 
-      they have been redirected 
-      to a named flow.</p>
+    <p>Each <span>region</span> in a <span>region chain</span> 
+      establishes a containing block for absolutely positioned 
+      elements in the <span>named flow</span> (see [[!CSS21]]).
+      That first <span>region</span> in a <span>region chain</span>
+      establishes the initial containing block for such absolutely
+      positioned elements. 
+      <span>Regions</span> don't establish a containing block for 
+      fixed positioned elements in the <span>named flow</span>.
+      Such fixed positioned elements are still positioned relative 
+      to the viewport or the page area even if they have been 
+      redirected into a named flow.</p>
 
     <p>The first region defines the principal 
       <a href="http://www.w3.org/TR/css3-writing-modes/#writing-mode1">writing mode</a>