| Xianzhu Wang | 8932806 | 2021-03-15 21:41:39 | [diff] [blame] | 1 | <!DOCTYPE html> |
| 2 | <title>Layout Instability: shift with counterscroll not counted, with 2 scrollers</title> |
| 3 | <link rel="help" href="https://wicg.github.io/layout-instability/" /> |
| 4 | <style> |
| 5 | .scroller { |
| 6 | overflow: scroll; |
| 7 | position: absolute; |
| 8 | left: 20px; |
| 9 | top: 20px; |
| 10 | width: 200px; |
| 11 | height: 200px; |
| 12 | } |
| 13 | .content { |
| 14 | width: 170px; |
| 15 | height: 600px; |
| 16 | } |
| 17 | .changer { |
| 18 | position: relative; |
| 19 | background: yellow; |
| 20 | left: 10px; |
| 21 | top: 100px; |
| 22 | width: 150px; |
| 23 | height: 150px; |
| 24 | } |
| 25 | |
| 26 | </style> |
| 27 | <div id="scroller1" class="scroller"> |
| 28 | <div class="content"> |
| 29 | <div id="changer1" class="changer"></div> |
| 30 | </div> |
| 31 | </div> |
| 32 | <div id="scroller2" class="scroller"> |
| 33 | <div class="content"> |
| 34 | <div id="changer2" class="changer"></div> |
| 35 | </div> |
| 36 | </div> |
| 37 | <script src="/resources/testharness.js"></script> |
| 38 | <script src="/resources/testharnessreport.js"></script> |
| 39 | <script src="resources/util.js"></script> |
| 40 | <script> |
| 41 | |
| 42 | promise_test(async () => { |
| 43 | const watcher = new ScoreWatcher; |
| 44 | |
| 45 | // Wait for the initial render to complete. |
| 46 | await waitForAnimationFrames(2); |
| 47 | |
| 48 | // Top goes from 100 to 200. scroll by 100 to counter it. |
| 49 | changer1.style.top = "200px"; |
| 50 | scroller1.scrollTop = 100; |
| 51 | // Top goes from 100 to 300. scroll by 200 to counter it. |
| 52 | changer2.style.top = "300px"; |
| 53 | scroller2.scrollTop = 200; |
| 54 | |
| 55 | await waitForAnimationFrames(3); |
| 56 | assert_equals(watcher.score, 0); |
| 57 | }, "Shift with counterscroll not counted, with 2 scrollers."); |
| 58 | |
| 59 | </script> |
