| <!DOCTYPE html> |
| <title>Layout Instability: no shifts from advancing video track</title> |
| <link rel="help" href="https://wicg.github.io/layout-instability/" /> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/test-adapter.js"></script> |
| <script src="resources/util.js"></script> |
| <video controls> |
| <source src="/media/white.webm" type="video/webm"> |
| </video> |
| <script> |
| |
| promise_test(async () => { |
| const watcher = new ScoreWatcher; |
| var video = document.querySelector("video"); |
| |
| await new Promise(resolve => { video.oncanplay = resolve; }); |
| await waitForAnimationFrames(2); |
| |
| // TODO(crbug.com/1088311): There are still some shifts from creating the |
| // <video>, so the score is already > 0 here. For now, just verify that |
| // advancing the track does not increase it further. |
| var currentScore = watcher.score; |
| |
| video.currentTime = 5; |
| |
| await waitForAnimationFrames(3); |
| cls_expect(watcher, {score: currentScore}); |
| |
| }, "No shifts from advancing video track."); |
| |
| </script> |