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Test Info:

<!DOCTYPE html>
<meta charset=utf-8>
<title>Local time</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../testcommon.js"></script>
<body>
<script>
'use strict';
test(t => {
const anim = createDiv(t).animate(null, 10 * MS_PER_SEC);
for (const seconds of [-1, 0, 5, 10, 20]) {
anim.currentTime = seconds * MS_PER_SEC;
assert_equals(
anim.effect.getComputedTiming().localTime,
seconds * MS_PER_SEC
);
}
}, 'Local time is current time for animation effects associated with an animation');
test(t => {
const effect = new KeyframeEffect(createDiv(t), null, 10 * MS_PER_SEC);
assert_equals(effect.getComputedTiming().localTime, null);
}, 'Local time is unresolved for animation effects not associated with an animation');
</script>
</body>