[Webkit-unassigned] [Bug 259061] New: [macOS] Non-zero translateZ() causing layers to be stacked in a incorrect z-order.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=259061

            Bug ID: 259061
           Summary: [macOS] Non-zero translateZ() causing layers to be
                    stacked in a incorrect z-order.
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            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 467004

  --> https://bugs.webkit.org/attachment.cgi?id=467004&action=review

A case to reproduce this issue

See the attached case and screenshot.

This issue could be reproduced on:

* WebKit local build
* Safari on macOS 13.2.1 (and presumably lower)
* Safari Technology Preview up to macOS 13.4.1

Temporarily commenting out `[m_layer setTransform:value]` at `PlatformCALayerCocoa::setTransform(const TransformationMatrix&)` could work-around this issue.

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