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<!DOCTYPE html>
<meta charset=utf-8>
<title>Animation.play()</title>
<link rel="help" href="https://w3c.github.io/web-animations/#dom-animation-play">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../testcommon.js"></script>
<body>
<div id="log"></div>
<script>
'use strict';
promise_test(function(t) {
var div = createDiv(t);
var animation = div.animate({ transform: ['none', 'translate(10px)']},
{ duration : 100 * MS_PER_SEC,
iterations : Infinity});
return animation.ready.then(function() {
// Seek to a time outside the active range so that play() will have to
// snap back to the start
animation.currentTime = -5 * MS_PER_SEC;
animation.playbackRate = -1;
assert_throws('InvalidStateError',
function () { animation.play(); },
'Expected InvalidStateError exception on calling play() ' +
'with a negative playbackRate and infinite-duration ' +
'animation');
});
}, 'play() throws when seeking an infinite-duration animation played in ' +
'reverse');
</script>
</body>
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