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| 1 <!DOCTYPE html> |
| 2 <script src="../resources/testharness.js"></script> |
| 3 <script src="../resources/testharnessreport.js"></script> |
| 4 |
| 5 <iframe id=frame></iframe> |
| 6 |
| 7 <script> |
| 8 var handle = async_test('Animation time should tick consistently across frames')
; |
| 9 var baseTime = document.timeline.currentTime; |
| 10 var frameBaseTime = frame.contentDocument.timeline.currentTime; |
| 11 setTimeout(function() { |
| 12 var start = performance.now(); |
| 13 while (performance.now() - start < 30); |
| 14 var delta = document.timeline.currentTime - baseTime; |
| 15 |
| 16 var start = performance.now(); |
| 17 while (performance.now() - start < 30); |
| 18 var frameDelta = frame.contentDocument.timeline.currentTime - frameBaseTime; |
| 19 |
| 20 handle.step(() => assert_equals(Math.round(delta), Math.round(frameDelta))); |
| 21 handle.done(); |
| 22 }); |
| 23 </script> |
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