| Xianzhu Wang | 70f8d79 | 2020-08-05 21:20:03 | [diff] [blame] | 1 | <!DOCTYPE html> |
| 2 | <title>Layout Instability: inline/text movement is detected</title> |
| 3 | <link rel="help" href="https://wicg.github.io/layout-instability/" /> |
| 4 | <script src="/resources/testharness.js"></script> |
| 5 | <script src="/resources/testharnessreport.js"></script> |
| 6 | <script src="resources/util.js"></script> |
| 7 | <div style="width: 200px; font-size: 20px; line-height: 25px"> |
| 8 | 1AAAAAAA<br> |
| 9 | 2AAAAAAA<br> |
| 10 | 3AAAAAAA<br> |
| 11 | <div id="inline-block" style="display: inline-block; height: 50px">4AAAAAAA</div><br> |
| 12 | 5AAAAAAA<br> |
| 13 | 6AAAAAAA<br> |
| 14 | 7AAAAAAA<br> |
| 15 | </div> |
| 16 | <script> |
| 17 | |
| 18 | promise_test(async () => { |
| 19 | const watcher = new ScoreWatcher; |
| 20 | |
| 21 | // Wait for the initial render to complete. |
| 22 | await waitForAnimationFrames(2); |
| 23 | |
| 24 | // Modify the position of the div. |
| 25 | const inline_block = document.querySelector("#inline-block"); |
| 26 | inline_block.style.height = '100px'; |
| 27 | |
| 28 | // The lines below the inline-block are shifted down by 50px. |
| 29 | // The implementation may measure the real width of the shifted text |
| 30 | // or use the available width (i.e. width of the containing block). |
| 31 | // Also tolerate extra 10% error. |
| 32 | const text_width = inline_block.offsetWidth; |
| 33 | const expectedScoreMin = computeExpectedScore(text_width * (30 * 3 + 50), 50) * 0.9; |
| 34 | const expectedScoreMax = computeExpectedScore(200 * (30 * 3 + 50), 50) * 1.1; |
| 35 | |
| 36 | // Observer fires after the frame is painted. |
| 37 | assert_equals(watcher.score, 0); |
| 38 | await watcher.promise; |
| 39 | assert_between_exclusive(watcher.score, expectedScoreMin, expectedScoreMax); |
| 40 | }, 'Inline flow movement.'); |
| 41 | |
| 42 | </script> |
