[Webkit-unassigned] [Bug 238127] New: Sticky positioned element inside grid has incorrect z order

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238127

            Bug ID: 238127
           Summary: Sticky positioned element inside grid has incorrect z
                    order
           Product: WebKit
           Version: Safari 15
          Hardware: All
                OS: macOS 10.15
            Status: NEW
          Severity: Major
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: moiseev.andy at gmail.com

Created attachment 455198

  --> https://bugs.webkit.org/attachment.cgi?id=455198&action=review

minimal html

Sticky positioned element inside grid rendered above its siblings on scroll, in-spite of being the first child in DOM, and placed in a first row of the grid container.
Works as expected in google chrome.

Notes:
- height of grid elements are auto;
- if you set top:10px for the sticky positioned element it will rendered underneath the second child, but still above others when you scroll

Safari 15.3
iOS 15

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