[Webkit-unassigned] [Bug 205369] New: Position sticky has issues when inside display flex

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205369

            Bug ID: 205369
           Summary: Position sticky has issues when inside display flex
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Major
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ccorcos at gmail.com

I've seen some other issues that all seem related:

https://bugs.webkit.org/show_bug.cgi?id=189461
https://bugs.webkit.org/show_bug.cgi?id=175029

I've created a repro that demonstrates how the header with position:sticky left:0 does not work when its parent has display flex:

https://codepen.io/ccorcos/pen/GRgroPW

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