| <!DOCTYPE html> |
| <title>Layout Instability: outline doesn't contribute to layout shift</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 id="target" style="width: 300px; height: 300px; background: blue"></div> |
| <script> |
| promise_test(async () => { |
| const watcher = new ScoreWatcher; |
| |
| // Wait for the initial render to complete. |
| await waitForAnimationFrames(2); |
| |
| // Add outline for target. This should not generate a shift. |
| target.style.outline = "10px solid blue"; |
| |
| await waitForAnimationFrames(3); |
| assert_equals(watcher.score, 0); |
| }, "Outline."); |
| </script> |
