[css2] Section 11.1 clarification on overflow cases

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extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%401817

Author: ianbjacobs

css2/visufx.src

@@ -30,10 +30,11 @@ block (i.e., the containing block's height is determined by the <span
 class="propinst-height">'height'</span> property, not by content
 height).
 
-<li>A box is <a href="visuren.html#absolute-positioning">positioned
-absolutely</a>.
+<li>A descendent box is <a href="visuren.html#absolute-positioning">positioned
+absolutely</a> partly outside of the box.
 
-<li>It has <a href="box.html#margin-properties">negative margins</a>.
+<li>A descendent box has <a href="box.html#margin-properties">negative margins</a>, causing it
+to be positioned partly outside the box.
 </ul>
 
 <p>Whenever overflow occurs, the <span