[Webkit-unassigned] [Bug 229408] New: Element rendered in the wrong place after sibling causes some layout changes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229408

            Bug ID: 229408
           Summary: Element rendered in the wrong place after sibling
                    causes some layout changes
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tomc at caurea.org
                CC: simon.fraser at apple.com

See this Codesandbox example: https://zmslt.csb.app

 - Note the magenta box in the center bottom of the screen
 - Click on the image (to enlarge it, it simply removes the explicit width/height on the img)
 - Notice how the magenta box shifts to the top left.

Safari Technology Preview, Release 130 (Safari 15.0, WebKit 16612.1.26.1.5)

It works correctly when you:

 - comment out the 'inset: 0;' line in .overlay
 - comment out the 'display: flex;' line in .overlay
 - comment out the 'overflow: auto;' line in .content
 - comment out the 'flex: 100% 0 1;' line in .content

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