| <!DOCTYPE html> |
| <title>Layout Instability: multi clip visual rect</title> |
| <link rel="help" href="https://wicg.github.io/layout-instability/" /> |
| <style> |
| |
| body { margin: 0; } |
| #outer { width: 200px; height: 600px; overflow: hidden; } |
| #inner { width: 300px; height: 150px; overflow: hidden; } |
| #j { position: relative; width: 300px; height: 600px; background: blue; } |
| |
| </style> |
| <div id='outer'><div id='inner'><div id='j'></div></div></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("#j").style.top = "-200px"; |
| |
| // Note that, while the element moves up 200px, its visibility is |
| // clipped at 0px,150px height, so the additional 200px of vertical |
| // move distance is not included in the score. |
| // (clip width 200) * (clip height 150) |
| const expectedScore = computeExpectedScore(200 * 150, 200); |
| |
| await watcher.promise; |
| assert_equals(watcher.score, expectedScore); |
| }, "Multi clip visual rect."); |
| |
| </script> |