| Steve Kobes | d0b09af | 2020-05-08 21:02:26 | [diff] [blame] | 1 | <!DOCTYPE html> |
| 2 | <title>Layout Instability: source attribution with redundant enclosure</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/test-adapter.js"></script> |
| 7 | <script src="resources/util.js"></script> |
| 8 | <style> |
| 9 | body { margin: 0; } |
| 10 | #shifter { |
| 11 | position: relative; background: #def; |
| 12 | width: 300px; height: 200px; |
| 13 | } |
| 14 | #inner { |
| 15 | position: relative; background: #f97; |
| 16 | width: 100px; height: 100px; |
| 17 | } |
| 18 | #absfollow { |
| 19 | position: absolute; background: #ffd; opacity: 50%; |
| 20 | width: 350px; height: 200px; left: 0; top: 160px; |
| 21 | } |
| 22 | .stateB { top: 160px; } |
| 23 | .stateB #inner { left: 100px; } |
| 24 | .stateC ~ #absfollow { top: 0; } |
| 25 | </style> |
| 26 | <div id="shifter" class="stateA"> |
| 27 | <div id="inner"></div> |
| 28 | </div> |
| 29 | <div id="absfollow"></div> |
| 30 | <script> |
| 31 | |
| 32 | promise_test(async () => { |
| 33 | const watcher = new ScoreWatcher; |
| 34 | let shifter = document.querySelector("#shifter"); |
| 35 | let absfollow = document.querySelector("#absfollow"); |
| 36 | |
| 37 | // Wait for the initial render to complete. |
| 38 | await waitForAnimationFrames(2); |
| 39 | |
| 40 | shifter.className = "stateB"; |
| 41 | await watcher.promise; |
| 42 | |
| 43 | // Shift of #inner ignored as redundant, fully enclosed by #shifter. |
| 44 | cls_expect(watcher, {sources: [{ |
| 45 | node: shifter, |
| 46 | previousRect: [0, 0, 300, 200], |
| 47 | currentRect: [0, 160, 300, 200] |
| 48 | }]}); |
| 49 | |
| 50 | shifter.className = "stateC"; |
| 51 | await watcher.promise; |
| 52 | |
| 53 | // Shift of #shifter ignored as redundant, fully enclosed by #absfollow. |
| 54 | cls_expect(watcher, {sources: [{ |
| 55 | node: absfollow, |
| 56 | previousRect: [0, 160, 350, 200], |
| 57 | currentRect: [0, 0, 350, 200] |
| 58 | }]}); |
| 59 | |
| 60 | }, "Sources with redundant enclosure."); |
| 61 | |
| 62 | </script> |
