[Webkit-unassigned] [Bug 273627] New: preserve-3d doesn't work across shadow boundaries

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=273627

            Bug ID: 273627
           Summary: preserve-3d doesn't work across shadow boundaries
           Product: WebKit
           Version: Safari 17
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dan.schultz at vertexvis.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

When using the `transform-style: preserve-3d` CSS property in a custom element that's using templates and slots, the `preserve-3d` behavior doesn't get applied to slotted children. Both Firefox and Chrome will apply the `transform-style` to the contents of the slot. We've been able to reproduce this issue in Safari Version 16 and 17 on macOS and iOS.

Here's a CodePen that reproduces the issue: https://codepen.io/danschultz/pen/PogrNOW

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