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<!DOCTYPE html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<body>
<div id='e'></div>
</body>
<script>
var element = document.getElementById('e');
var style = getComputedStyle(element);
var duration = 1;
var keyframeEffect = new KeyframeEffect(element,
[{opacity: '1', offset: 0},
{opacity: '0', offset: 1}],
duration);
test(function() {
var player = document.timeline.play(keyframeEffect);
player.pause();
player.currentTime = duration / 2;
assert_equals(style.opacity, '0.5');
}, 'Calling document.timeline.play() should start an animation.');
</script>
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