Add some kind of definition for bg painting area

Author: fantasai

css3-background/Overview.html

@@ -25,12 +25,12 @@
 
    <h1>CSS Backgrounds and Borders Module Level 3</h1>
 
-   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 21 June 2012</h2>
+   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 22 June 2012</h2>
 
    <dl>
     <dt>This version:
 
-    <dd><!-- <a href="http://www.w3.org/TR/2012/CR-css3-background-20120621">http://www.w3.org/TR/2012/ED-css3-background-20120621/</a> -->
+    <dd><!-- <a href="http://www.w3.org/TR/2012/CR-css3-background-20120622">http://www.w3.org/TR/2012/ED-css3-background-20120622/</a> -->
      <a
      href="http://dev.w3.org/csswg/css3-background/">http://dev.w3.org/csswg/css3-background/</a>
 
@@ -1343,7 +1343,8 @@ <h3 id=the-background-clip><span class=secno>3.7. </span>Painting Area: the
   </table>
 
   <p>Determines the <dfn id=background-painting-area>background painting
-   area</dfn>. The syntax of the property is given with
+   area</dfn>, which determines the area within which the background is
+   painted. The syntax of the property is given with
 
   <pre class=prod><dfn
    id=ltboxgt><var>&lt;box&gt;</var></dfn> = border-box | padding-box | content-box</pre>
@@ -2880,9 +2881,10 @@ <h3 id=corner-clipping><span class=secno>5.3. </span>Corner Clipping</h3>
    the border or padding edge (such as ‘<code
    class=property>overflow</code>’ other than ‘<code
    class=css>visible</code>’) also must clip to the curve. The content of
-   replaced elements is always trimmed to the content edge curve. Also, the
-   area outside the curve of the border edge does not accept pointer events
-   on behalf of the element.
+   replaced elements is always trimmed to the content edge curve.
+
+  <p>Also, the area outside the curve of the border edge does not accept
+   pointer events on behalf of the element.
 
   <p class=note>As ‘<a href="#border-radius"><code
    class=property>border-radius</code></a>’ reduces the interactive area of

css3-background/Overview.src.html

@@ -868,8 +868,9 @@ <h3 id="the-background-clip">Painting Area: the 'background-clip' property</h3>
       <td>no
 </table>
 
-<p>Determines the <dfn id="background-painting-area">background painting
-area</dfn>. The syntax of the property is given with
+<p>Determines the <dfn id="background-painting-area">background painting area</dfn>,
+which determines the area within which the background is painted.
+The syntax of the property is given with
 
 <pre class=prod><dfn><var>&lt;box&gt;</var></dfn> = border-box | padding-box | content-box</pre>
 
@@ -2050,7 +2051,8 @@ <h3 id="corner-clipping">Corner Clipping</h3>
 Other effects that clip to the border or padding edge (such as 'overflow'
 other than ''visible'') also must clip to the curve. The content of
 replaced elements is always trimmed to the content edge curve.
-Also, the area outside the curve of the border edge does not
+
+<p>Also, the area outside the curve of the border edge does not
 accept pointer events on behalf of the element.
 
 <p class="note">As 'border-radius' reduces the interactive area of an element