284300 2024-12-09 08:51:10 -0800 [scroll-animations] WPT test scroll-animations/view-timelines/view-timeline-root-source.html is a flaky failure on iOS 2026-01-12 09:05:11 -0800 1 1 1 Unclassified WebKit CSS WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=284298 InRadar P2 Normal --- 1 graouts webkit-unassigned graouts koivisto webkit-bug-importer oldest_to_newest 2080209 0 graouts 2024-12-09 08:51:10 -0800 The test imported/w3c/web-platform-tests/scroll-animations/view-timelines/view-timeline-root-source.html is a flaky failure on iOS following the fix for bug 284298. 2080258 1 webkit-bug-importer 2024-12-09 11:44:52 -0800 <rdar://problem/141168977> 2113495 2 graouts 2025-04-28 05:01:42 -0700 The timeline current time is sometimes computed as -85.714287% due to the subject having a reported top position of 1200px instead of 250px (observed in the test by using `getBoundingClientRect()`). So this appears to be an issue in our layout code. 2113499 3 graouts 2025-04-28 05:05:12 -0700 Interestingly, waiting for an additional two frames after setting `scrollTop` makes the test pass reliably. 2113500 4 graouts 2025-04-28 05:10:26 -0700 Oh, I see the target has `margin: 200vh`. Switching to using `margin: 250px` makes the test pass reliably as well. 2113648 5 graouts 2025-04-28 12:45:17 -0700 Moving to the CSS component as a result. Might end up being Layout & Rendering, but it feels like a better start.