321467 2026-08-10 15:31:05 -0700 [iOS] object-view-box view-transition overflow-visible path off by 1 device pixel 2026-08-11 14:52:57 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=316882 InRadar P2 Normal --- 1 tang.alice.000 webkit-unassigned bfulgham simon.fraser webkit-bug-importer zalan oldest_to_newest 2239070 0 tang.alice.000 2026-08-10 15:31:05 -0700 old-content-with-object-view-box.html and new-content-with-object-view-box.html (imported/w3c/web-platform-tests/css/css-view-transitions/) fail on iOS by 1 device pixel. Root cause: RenderViewTransitionCapture.cpp, in the overflow-visible paint path for ::view-transition-old/new with object-view-box: dstRect = snapRectToDevicePixels(computePaintRectForObjectViewBox(replacedContentRect), document().deviceScaleFactor()); On iOS's higher deviceScaleFactor (2x/3x vs. Mac), this snaps the view-box paint rect to a different device pixel than the reference image expects, producing a consistent 1px diff. Appears to be a device-pixel-snapping rounding difference, not a functional bug. 2239073 1 webkit-bug-importer 2026-08-10 15:34:42 -0700 <rdar://problem/184557440> 2239095 2 tang.alice.000 2026-08-10 16:53:44 -0700 Pull request: https://github.com/WebKit/WebKit/pull/71328 2239369 3 ews-feeder 2026-08-11 14:52:57 -0700 Test gardening commit 318994@main (b11e8b5ae63a): <https://commits.webkit.org/318994@main> Reviewed commits have been landed. Closing PR #71328 and removing active labels.