| Steve Kobes | 1a09247 | 2019-11-25 15:54:13 | [diff] [blame] | 1 | <!DOCTYPE html> |
| 2 | <title>Layout Instability: shift with counterscroll not counted</title> |
| 3 | <link rel="help" href="https://wicg.github.io/layout-instability/" /> |
| 4 | <style> |
| 5 | |
| 6 | #s { |
| 7 | overflow: scroll; |
| 8 | position: absolute; |
| 9 | left: 20px; |
| 10 | top: 20px; |
| 11 | width: 200px; |
| 12 | height: 200px; |
| 13 | } |
| 14 | #sp { |
| 15 | width: 170px; |
| 16 | height: 600px; |
| 17 | } |
| 18 | #ch { |
| 19 | position: relative; |
| 20 | background: yellow; |
| 21 | left: 10px; |
| 22 | top: 100px; |
| 23 | width: 150px; |
| 24 | height: 150px; |
| 25 | } |
| 26 | |
| 27 | </style> |
| 28 | <div id="s"> |
| 29 | <div id="sp"> |
| 30 | <div id="ch"></div> |
| 31 | </div> |
| 32 | </div> |
| 33 | <script src="/resources/testharness.js"></script> |
| 34 | <script src="/resources/testharnessreport.js"></script> |
| 35 | <script src="resources/util.js"></script> |
| 36 | <script> |
| 37 | |
| 38 | promise_test(async () => { |
| 39 | const watcher = new ScoreWatcher; |
| 40 | |
| 41 | // Wait for the initial render to complete. |
| 42 | await waitForAnimationFrames(2); |
| 43 | |
| 44 | let scroller = document.querySelector("#s"); |
| 45 | let changer = document.querySelector("#ch"); |
| 46 | |
| 47 | changer.style.top = "200px"; |
| 48 | scroller.scrollTop = 100; |
| 49 | |
| 50 | await waitForAnimationFrames(3); |
| 51 | assert_equals(watcher.score, 0); |
| 52 | }, "Shift with counterscroll not counted."); |
| 53 | |
| 54 | </script> |
