[Webkit-unassigned] [Bug 265362] New: Element flickers when transitioning boxShadow with large spread value

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=265362

            Bug ID: 265362
           Summary: Element flickers when transitioning boxShadow with
                    large spread value
           Product: WebKit
           Version: Safari 17
          Hardware: Mac (Apple Silicon)
                OS: macOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bunnnywong at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 468761

  --> https://bugs.webkit.org/attachment.cgi?id=468761&action=review

a page to reproduce the flickering issue

Element flickers when transitioning `box-shadow` with a large spread value, see the attached html file and screen recording.

This issue happens when the element has non-zero `border-radius` and non-integer `margin`s.

It happens only on macOS 14.

Force using using `PathRoundedRect::Strategy::PreferBezier` for `PathCG::addRoundedRect(const FloatRoundedRect&, PathRoundedRect::Strategy)` seems to work around this issue.

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