add getComputedStyle to Region interface

Author: astearns

css3-regions/Overview.html

@@ -1989,6 +1989,12 @@ <h3 id=the-region-interface><span class=secno>6.2. </span>The Region
   sequence&lt;<a
    href="#">Range</a>&gt;? <a
    href="#dom-region-getregionflowranges">getRegionFlowRanges()</a>;
+  <a
+   href="http://dev.w3.org/csswg/cssom/#cssstyledeclaration">CSSStyleDeclaration</a> <a
+   href="#dom-region-getComputedStyle">getComputedStyle</a>(Element elt);
+  <a
+   href="http://dev.w3.org/csswg/cssom/#cssstyledeclaration">CSSStyleDeclaration</a> <a
+   href="#dom-region-getComputedStyle">getComputedStyle</a>(Element elt, DOMString pseudoElt);
 };</pre>
 
   <p>The <dfn id=dom-region-regionoverset><code
@@ -2064,6 +2070,23 @@ <h3 id=the-region-interface><span class=secno>6.2. </span>The Region
    method returns null if the <a href="#css-region">region</a> object is not
    (or no longer) a region.
 
+  <p>The <dfn id=dom-region-getComputedStyle>getComputedStyle</dfn> methods
+   on the Region interface work the same as the <a
+   href="http://dev.w3.org/csswg/cssom/#dom-window-getcomputedstyle"><code
+   class=idl>getComputedStyle</code></a> <a href="#CSSOM"
+   rel=biblioentry>[CSSOM]<!--{{!CSSOM}}--></a> methods on the <a
+   href="http://www.whatwg.org/specs/web-apps/current-work/multipage/browsers.html#window"><code
+   class=idl>Window</code></a> interface [[!HTML]] with the following
+   exceptions. For the <a href="#css-region"><code
+   class=idl>Region</code></a> interface the <a
+   href="http://dev.w3.org/csswg/cssom/#cssstyledeclaration">CSSStyleDeclaration</a>
+   returned must include the result of <a
+   href="#the-at-region-style-rule">region styling</a>. If the element is
+   fragmented across region boundaries, the <a
+   href="http://dev.w3.org/csswg/cssom/#cssstyledeclaration">CSSStyleDeclaration</a>
+   returned must apply only to the fragment that flows through the <span>CSS
+   Region</span>.
+
   <div class=note>
    <p>A <a href="#css-region"><code class=idl>Region</code></a> instance may
     represent and object that is no longer a <a
@@ -3578,6 +3601,9 @@ <h2 class=no-num id=index>Index</h2>
    <li>flow-into, <a href="#flow-into"
     title=flow-into><strong>3.1.</strong></a>
 
+   <li>getComputedStyle, <a href="#dom-region-getComputedStyle"
+    title=getComputedStyle><strong>6.2.</strong></a>
+
    <li>getContent(), <a href="#dom-named-flow-get-content"
     title="getContent()"><strong>6.1.</strong></a>
 

css3-regions/Overview.src.html

@@ -1748,6 +1748,8 @@ <h3 id="the-region-interface">The Region interface</h3>
   readonly attribute DOMString <a href="#dom-region-flowfrom">flowFrom</a>;
   sequence&lt;<a href="#">Range</a>&gt;? <a href=
 "#dom-region-getregionflowranges">getRegionFlowRanges()</a>;
+  <a href="http://dev.w3.org/csswg/cssom/#cssstyledeclaration">CSSStyleDeclaration</a> <a href="#dom-region-getComputedStyle">getComputedStyle</a>(Element elt);
+  <a href="http://dev.w3.org/csswg/cssom/#cssstyledeclaration">CSSStyleDeclaration</a> <a href="#dom-region-getComputedStyle">getComputedStyle</a>(Element elt, DOMString pseudoElt);
 };</pre>
 
         <p>The <dfn id="dom-region-regionoverset"><code class=
@@ -1831,6 +1833,20 @@ <h3 id="the-region-interface">The Region interface</h3>
           if the <span>region</span> object 
           is not (or no longer) a region.</p>
 
+        <p>The <dfn id="dom-region-getComputedStyle">getComputedStyle</dfn> 
+          methods on the Region interface work the same as the 
+          <a href="http://dev.w3.org/csswg/cssom/#dom-window-getcomputedstyle"><code class="idl">getComputedStyle</code></a> [[!CSSOM]] 
+          methods on the <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/browsers.html#window"><code class="idl">Window</code></a> 
+          interface [[!HTML]] with the following exceptions. 
+          For the <code class="idl">Region</code> interface 
+          the <a href="http://dev.w3.org/csswg/cssom/#cssstyledeclaration">CSSStyleDeclaration</a> 
+          returned must include the result of 
+          <a href="#the-at-region-style-rule">region styling</a>. 
+          If the element is fragmented across region boundaries, 
+          the <a href="http://dev.w3.org/csswg/cssom/#cssstyledeclaration">CSSStyleDeclaration</a>  returned must apply only 
+          to the fragment that flows through 
+          the <span>CSS Region</span>.
+
         <div class="note">
             <p>A <code class="idl">Region</code> instance may represent and 
             object that is no longer a <span>region</span>. This may happen, for example if the