| <!DOCTYPE html> |
| <title>Layout Instability: sticky positioned layout no change</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/util.js"></script> |
| <div style="height: 3000px"></div> |
| <div id="sticky" style="position: sticky; width: 200px; height: 300px; bottom: 0"> |
| <div style="will-change: transform; height: 3000px; background: yellow"></div> |
| </div> |
| <script> |
| |
| promise_test(async () => { |
| const watcher = new ScoreWatcher; |
| |
| // Wait for the initial render to complete. |
| await waitForAnimationFrames(2); |
| |
| // This doesn't change layout because the sticky element sticks to the bottom. |
| sticky.style.marginTop = "-1000px"; |
| |
| await waitForAnimationFrames(3); |
| assert_equals(watcher.score, 0); |
| }, 'Sticky layout no change.'); |
| |
| </script> |