RESOLVED DUPLICATE of bug 299728299727
Missing paint invalidation of area previously covered by a repositioned element 
https://bugs.webkit.org/show_bug.cgi?id=299727
Summary Missing paint invalidation of area previously covered by a repositioned element
Jonas Walldén
Reported 2025-09-29 04:58:57 PDT
Created attachment 476889 [details] Test case The attached test case creates a ruler and tracks the mouse to render a measurement value on top of the ruler. When mousing around in the window I see remnants of earlier placements still on screen. This is a regression from before version 26, and I've reproduced it in two different macOS installations: Safari 21622.1.22.11.14 running on macOS 26.0 (25A354), and Safari 20622.1.22.118.4 running on macOS 15.7 (24G222). It's also present in Safari Technology Preview r228. I've noticed three workarounds which are included in the test case as `body.workaround1`, `body.workaround2` and `body.workaround3`. They include switching from fixed to absolute positioning, disabling overflow and not setting a z-index.
Attachments
Test case (2.23 KB, text/html)
2025-09-29 04:58 PDT, Jonas Walldén 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Jonas Walldén
Comment 1 2025-09-29 05:03:22 PDT
*** This bug has been marked as a duplicate of bug 299728 ***
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