[Webkit-unassigned] [Bug 259343] New: Fixed element inside sticky container inside element with overflow-y: auto is being partially hidden

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=259343

            Bug ID: 259343
           Summary: Fixed element inside sticky container inside element
                    with overflow-y: auto is being partially hidden
           Product: WebKit
           Version: Safari Technology Preview
          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: jc.dafko at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 467074

  --> https://bugs.webkit.org/attachment.cgi?id=467074&action=review

Repro cases showing fixed-positioned child with a sticky-positioned parent not escaping scrolling/clipping container

Ported from https://bugzilla.mozilla.org/show_bug.cgi?id=1571330

Repro case: https://codepen.io/jcfranco/pen/XWyYJRW

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