[Webkit-unassigned] [Bug 201455] New: position: static element with border radius does not hide position: relative elements if a layer behind it has position: fixed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201455

            Bug ID: 201455
           Summary: position: static element with border radius does not
                    hide position: relative elements if a layer behind it
                    has position: fixed
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tombigel at wix.com

Created attachment 377971

  --> https://bugs.webkit.org/attachment.cgi?id=377971&action=review

bug example

when applying border radius on an element with no positioning and a border-radius it does not clip relatively positioned elements inside it only if a layer behind it has fixed positioning applied
Works as expected on Chrome and Firefox
Codepen of attached example: https://codepen.io/tombigel/pen/OJLOmpN

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