[css2] Added description of the new red arrows in the image.

--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%403152

Author: bert-github

css2/images/longdesc/clip-desc.html

@@ -28,6 +28,16 @@ <h1>Long description for example clipping region</h1>
 of the P box's right edge. Thus, the clipping region lies partially
 outside the P box.
 
+<P>Both block boxes have four red arrows representing the four offsets
+in the corresponding style rule: one short, vertical arrow labeled
+"top" goes from the top edge of the block box to the top of the
+clipping region; one longer vertical arrow labeled "bottom" goes from
+the top op the block box to the bottom of the clipping region; one
+short, horizontal arrow labeled "left" goes from the left edge of the
+block to the left edge of the clipping region; and one longer
+horizontal arrow labeled "right" goes from the left edge of the block
+to the right edge of the clipping region.
+
 <P><a href="../../visufx.html#img-clip">Return to image.</a> 
   </body>
 </html>