| <!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> |
