[Webkit-unassigned] [Bug 248655] New: Contain paint breaks perspective

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=248655

            Bug ID: 248655
           Summary: Contain paint breaks perspective
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Apple Silicon)
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: johannes.odland at nrk.no
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Similar to resolved Firefox issue: https://bugzilla.mozilla.org/show_bug.cgi?id=1681452

Steps to reproduce:

Set perspective to an outer element.
Add a background and content to an inner wrapper element.
Translate the background in the z-axis.
Set contain: paint to the inner element.

https://codepen.io/johannesodland/pen/WNGGxjd

Actual results:

Rendering of perspective breaks.

Expected results:

The content should render as it was without "contain: paint" (It should not break).
Content overflowing the wrapper element should not be rendered.

Perspective rendering in Chrome and Firefox does not break on "contain: paint".

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