Recommend that border-image outside border box does not trigger for hit testing, and that border-radius also clips the active area. See http://lists.w3.org/Archives/Public/www-style/2009Mar/0433.html

Author: fantasai

css3-background/Overview.html

@@ -22,13 +22,13 @@
 
    <h1>CSS Backgrounds and Borders Module Level 3</h1>
 
-   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 16 October
+   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 16 November
     2009</h2>
 
    <dl>
     <dt>This version:
 
-    <dd><!--<a href="http://www.w3.org/TR/2009/CR-css3-background-20091016">http://www.w3.org/TR/2009/ED-css3-background-20091016</a>-->
+    <dd><!--<a href="http://www.w3.org/TR/2009/CR-css3-background-20091116">http://www.w3.org/TR/2009/ED-css3-background-20091116</a>-->
      <a
      href="http://dev.w3.org/csswg/css3-background">http://dev.w3.org/csswg/css3-background</a>
 
@@ -2427,7 +2427,9 @@ <h3 id=the-border-radius><span class=secno>4.4 </span>The &lsquo;<code
    that clip to the border or padding edge (such as &lsquo;<code
    class=property>overflow</code>&rsquo; other than &lsquo;<code
    class=css>visible</code>&rsquo;) also must clip to the curve. The content
-   of replaced elements is always trimmed to the content edge curve.
+   of replaced elements is always trimmed to the content edge curve. The CSS
+   Working Group recommends that the area outside the curve of the border
+   edge does not accept mouse events on behalf of the element.
 
   <div class=figure>
    <p><img alt="Diagram of the inscribed ellips" src=corner.png>
@@ -3179,7 +3181,9 @@ <h3 id=the-border-image-outset><span class=secno>5.4 </span>The
    href="#border-image-outset">border-image-outset</a></code>&rsquo; values.
 
   <p>Portions of the border-image that are rendered outside the border box do
-   not trigger scrolling.
+   not trigger scrolling. The CSS Working Group recommends that such portions
+   are invisible to mouse events and do not capture clicks on behalf of the
+   element.
 
   <p class=note>Note that, even though they never cause a scrolling
    mechanism, they may still be clipped by an ancestor or by the viewport.

css3-background/Overview.src.html

@@ -1751,6 +1751,8 @@ <h3 id="the-border-radius">The 'border-radius' properties</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.
+The CSS Working Group recommends that the area outside the curve of the
+border edge does not accept mouse events on behalf of the element.
 
 <div class="figure">
   <p><img alt="Diagram of the inscribed ellips" src="corner.png">
@@ -2335,7 +2337,9 @@ <h3 id="the-border-image-outset">The 'border-image-outset' property</h3>
 <p>Negative values are not allowed for any of the 'border-image-outset' values.
 
 <p>Portions of the border-image that are rendered outside the border
-box do not trigger scrolling.</p>
+box do not trigger scrolling. The CSS Working Group recommends that
+such portions are invisible to mouse events and do not capture clicks
+on behalf of the element.</p>
 
 <p class=note>Note that, even though they never cause a scrolling
 mechanism, they may still be clipped by an ancestor or by the