Copyright: Copyright 1998-2001 W3C (MIT, INRIA, Keio), All Rights Reserved.
See http://www.w3.org/Consortium/Legal/.
Author: Muriel Jourdan (Muriel.Jourdan@inrialpes.fr)
           Version: APr. 11, 2000, v1        
            Module: SMIL Timing & Sync Module 
         Attribute: begin attribute
           Feature: begin attribute and Negative Delay 
         File Name: Negative_Delay7.smil
  Media Components: 1 MPG (dur = 5.6s), 1JPG
 Expected Behavior: foo is shown for 10s. 
                    When/if foo is clicked 
                    then the video starts to play 
                    but its three first seconds are skipped 
                    (we only see vid during 2.6s).
<smil xmlns="http://www.w3.org/2001/SMIL20/Language">
      <img id="foo" src="../images/smile.jpg" dur="10s" />
      <video id="vid" src="../videos/nist.mpg" begin="foo.activateEvent - 3s"