<svg xmlns="http://www.w3.org/2000/svg"
     xmlns:xlink="http://www.w3.org/1999/xlink"
     onload="go()">
  <!-- In this test, we change an animation element's "by" attribute to an
       invalid value. We verify that animation effects are removed from the
       previously-targeted attribute. -->
  <script>
    function go() {
      // Seek animation before we start tweaking things, to make sure we've
      // already started sampling it.
      document.documentElement.setCurrentTime(2.0);

      var anim = document.getElementById("anim");
      anim.setAttributeNS(null, "by", "invalid value that can't be added");
      setTimeAndSnapshot(2.5, false);
    }
  </script>
  <script xlink:href="smil-util.js" type="text/javascript"/>
  <rect x="15" y="15" width="200" height="200" fill="blue">
    <animate id="anim" attributeName="x"
             begin="0s" dur="2s" by="100" fill="freeze"/>
  </rect>
</svg>