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<!DOCTYPE html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<div id="target"></div>
<script>
test(function() {
  var keyframes = [
      {left: '0px'},
      {left: '100px'}
  ];
  var timing = {
      duration: 1,
      delay: -100,
  };
  var player = target.animate(keyframes, timing);
  document.timeline.currentTime = 0;
  var oldStartTime = player.startTime;
  player.startTime += 2000;
  assert_equals(player.startTime, oldStartTime + 2000);
  player.play();
  assert_equals(player.startTime, null);
  assert_equals(player.currentTime, 0);
}, 'Play() called with a large negative delay');
</script>