     /**
      *  Returns the bounds of the first layout element that either spans or
      *  is below the scrollRect's bottom edge.
-     * 
-     *  Used by the getVerticalScrollPositionDelta() method.
-     * 
+     *
+     *  <p>This is a convenience method that is used by the default
+     *  implementation of the <code>getVerticalScrollPositionDelta()</code> method.
+     *  Subclasses that rely on the default implementation of
+     *  <code>getVerticalScrollPositionDelta()</code> should override this method to
+     *  provide an accurate bounding rectangle that has valid <code>top</code> and 
+     *  <code>bottom</code> properties.</p>
+     *
      *  By default this method returns a Rectangle with width=0, height=1, 
      *  whose bottom edge is one more than the scrollRect's bottom edge, 
      *  and left=0.
-     * 
-     *  Subclasses should override this method to provide an accurate
-     *  bounding rectangle that has valid <code>top</code> and 
-     *  <code>bottom</code> properties.
-     * 
+     *
      *  @param scrollRect The target's scrollRect.
      *  @return Returns the bounds of the first element that spans or is
      *  below the scrollRect’s bottom edge.
-     *  
+     *
      *  @see #elementBoundsLeftOfScrollRect
      *  @see #elementBoundsRightScrollRect
      *  @see #elementBoundsAboveScrollRect
      *  @see #getVerticalScrollPositionDelta
-     *  
+     *
      *  @langversion 3.0
      *  @playerversion Flash 10
      *  @playerversion AIR 1.5

    //--------------------------------------------------------------------------
    
    /**
     *  Returns the bounds of the target's scrollRect in layout coordinates.
     * 
     *  Layout methods should not get the target's scrollRect directly.

     *  Returns the bounds of the first layout element that either spans or
     *  is to the right of the scrollRect's right edge.
     * 
     *  <p>This is a convenience method that is used by the default
     *  implementation of the <code>getHorizontalScrollPositionDelta()</code> method.
     *  Subclasses that rely on the default implementation of
     *  <code>getHorizontalScrollPositionDelta()</code> should override this method to
     *  provide an accurate bounding rectangle that has valid <code>left</code> and 
     *  <code>right</code> properties.</p>
     * 
     *  By default this method returns a Rectangle with width=1, height=0, 
     *  whose right edge is one more than the scrollRect's right edge, 
     *  and top=0.
     * 
     *  @param scrollRect The target's scrollRect.
     *  @return Returns the bounds of the first element that spans or is to
