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<!DOCTYPE html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<iframe id=frame></iframe>
<script>
var handle = async_test('Animation time should tick consistently across frames');
var baseTime = document.timeline.currentTime;
var frameBaseTime = frame.contentDocument.timeline.currentTime;
setTimeout(function() {
var start = performance.now();
while (performance.now() - start < 30);
var delta = document.timeline.currentTime - baseTime;
var start = performance.now();
while (performance.now() - start < 30);
var frameDelta = frame.contentDocument.timeline.currentTime - frameBaseTime;
handle.step(() => assert_equals(Math.round(delta), Math.round(frameDelta)));
handle.done();
});
</script>
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