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Test Info:

<!DOCTYPE html>
<html>
<title>GetComputedTiming on an animation without an execution context,
timeline or playback rate</title>
<link rel="author" title="Google" href="http://www.google.com/">
<meta name="assert" content="This should not crash.">
<body>
<div id="target"></div>
<iframe id="iframe"></iframe>
</body>
<script type="text/javascript">
const keyframeEffect = new KeyframeEffect(target, { opacity: [1, 1] });
const anim = new iframe.contentWindow.Animation(keyframeEffect, null);
anim.play();
anim.playbackRate = 0;
document.body.removeChild(iframe);
anim.effect.getComputedTiming();
</script>
</html>