<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg">

<bindings xmlns="http://www.mozilla.org/xbl">
  <binding id="foo">
    <content>
      <animate xmlns="http://www.w3.org/2000/svg" begin="a.begin">
        <children xmlns="http://www.mozilla.org/xbl"/>
      </animate>
    </content>
  </binding>
</bindings>

<animate id="a" begin="b.begin; 3s"/>
<animate id="b" begin="a.begin"/>

<script type="text/javascript">

function boom()
{
  document.documentElement.pauseAnimations();
  document.documentElement.setCurrentTime(0);
  document.getElementById('a').beginElementAt(1);
  document.documentElement.style.MozBinding = 'url(#foo)';
}

window.addEventListener("load", boom, false);

</script>

</svg>