| <!DOCTYPE html> |
| <title>Layout Instability: shift of a transformed container</title> |
| <link rel="help" href="https://wicg.github.io/layout-instability/" /> |
| <style> |
| body { margin: 0; } |
| #transformed { position: relative; transform: translateX(20px); width: 100px; height: 100px; background: blue; } |
| </style> |
| <div id="transformed"></div> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/util.js"></script> |
| <script> |
| |
| promise_test(async () => { |
| const watcher = new ScoreWatcher; |
| |
| // Wait for the initial render to complete. |
| await waitForAnimationFrames(2); |
| |
| document.querySelector("#transformed").style = "top: 50px"; |
| |
| const expectedScore = computeExpectedScore(100 * (100 + 50), 50); |
| |
| await watcher.promise; |
| assert_equals(watcher.score, expectedScore); |
| }, 'Move transformed container'); |
| |
| </script> |