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Test Info:

<!DOCTYPE html>
<meta charset=utf-8>
<title>Animation.id</title>
<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';
test(t => {
const div = createDiv(t);
const animation = div.animate({}, 100 * MS_PER_SEC);
assert_equals(animation.id, '', 'id for Animation is initially empty');
}, 'Animation.id initial value');
test(t => {
const div = createDiv(t);
const animation = div.animate({}, 100 * MS_PER_SEC);
animation.id = 'anim';
assert_equals(animation.id, 'anim', 'animation.id reflects the value set');
}, 'Animation.id setter');
</script>
</body>