<!doctype>
<style>
  p:only-of-type {
      -webkit-animation: reverse,alternate;
      -webkit-animation-name: keyframes1;
      -webkit-animation-duration: 0.5s;
  }
  @keyframes keyframes1 {}
</style>
<script>
  function main() {
      if (window.testRunner)
          testRunner.dumpAsText();
      console.log('This test passes if it does not crash.');
      var animations = A.getAnimations();
      document.body.appendChild(A);
      animations[0].startTime = 0;
  }
</script>
<body onload="main()">
  <p></p>
  <div>
    <p id="A"></p>
  </div>
</body>