[Webkit-unassigned] [Bug 210656] New: Safari incorrectly positions elements that have a CSS combination of display:grid and position:sticky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210656

            Bug ID: 210656
           Summary: Safari incorrectly positions elements that have a CSS
                    combination of display:grid and position:sticky
           Product: WebKit
           Version: Safari 13
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mohannad at drhashem.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 396767

  --> https://bugs.webkit.org/attachment.cgi?id=396767&action=review

HTML page demonstrating issue.

Safari incorrectly positions sticky elements that have a CSS combination of display:grid and position:sticky
- This used to work just fine in prior releases.
- Please see attached HTML page. The blue box (position: sticky) should stay in the same position when scrolling vertically but once the height of the view port has been reached, the box starts moving up like a regular element.

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