[] (0) Try to clarify the 'bounding box' stuff for seamless.

Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=15035
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7314 340c8d12-0b0e-0410-8428-c7bf67bfef74

complete.html

@@ -26912,12 +26912,14 @@ <h4 id=the-iframe-element><span class=secno>4.8.2 </span>The <dfn><code>iframe</
 
    <li><p>In visual media, in a CSS-supporting user agent: the user
    agent should set the intrinsic height of the <code><a href=#the-iframe-element>iframe</a></code> to
-   the height of the bounding box around the content rendered in the
+   the shortest height that would make the content rendered in the
    <code><a href=#the-iframe-element>iframe</a></code> at its current width (as given in the previous
-   bullet point), as it would be if the scrolling position was such
-   that the top of the viewport for the content rendered in the
-   <code><a href=#the-iframe-element>iframe</a></code> was aligned with the origin of that content's
-   canvas.</li>
+   bullet point) have no scrollable overflow at its bottom edge<!--,
+   if the scrolling position was such that the top of the viewport for
+   the content rendered in the <code>iframe</code> was aligned with
+   the origin of that content's canvas-->. Scrollable overflow is any
+   overflow that would increase the range to which a scrollbar or
+   other scrolling mechanism can scroll.</li>
 
    <li>
 

index

@@ -26912,12 +26912,14 @@ href="?audio"&gt;audio&lt;/a&gt; test instead.)&lt;/p&gt;</pre>
 
    <li><p>In visual media, in a CSS-supporting user agent: the user
    agent should set the intrinsic height of the <code><a href=#the-iframe-element>iframe</a></code> to
-   the height of the bounding box around the content rendered in the
+   the shortest height that would make the content rendered in the
    <code><a href=#the-iframe-element>iframe</a></code> at its current width (as given in the previous
-   bullet point), as it would be if the scrolling position was such
-   that the top of the viewport for the content rendered in the
-   <code><a href=#the-iframe-element>iframe</a></code> was aligned with the origin of that content's
-   canvas.</li>
+   bullet point) have no scrollable overflow at its bottom edge<!--,
+   if the scrolling position was such that the top of the viewport for
+   the content rendered in the <code>iframe</code> was aligned with
+   the origin of that content's canvas-->. Scrollable overflow is any
+   overflow that would increase the range to which a scrollbar or
+   other scrolling mechanism can scroll.</li>
 
    <li>
 

source

@@ -29016,12 +29016,14 @@ href="?audio">audio&lt;/a> test instead.)&lt;/p></pre>
 
    <li><p>In visual media, in a CSS-supporting user agent: the user
    agent should set the intrinsic height of the <code>iframe</code> to
-   the height of the bounding box around the content rendered in the
+   the shortest height that would make the content rendered in the
    <code>iframe</code> at its current width (as given in the previous
-   bullet point), as it would be if the scrolling position was such
-   that the top of the viewport for the content rendered in the
-   <code>iframe</code> was aligned with the origin of that content's
-   canvas.</p></li>
+   bullet point) have no scrollable overflow at its bottom edge<!--,
+   if the scrolling position was such that the top of the viewport for
+   the content rendered in the <code>iframe</code> was aligned with
+   the origin of that content's canvas-->. Scrollable overflow is any
+   overflow that would increase the range to which a scrollbar or
+   other scrolling mechanism can scroll.</p></li>
 
    <li>