[Webkit-unassigned] [Bug 238560] New: `contain: layout` on the html element should change position:fixed behavior

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238560

            Bug ID: 238560
           Summary: `contain: layout` on the html element should change
                    position:fixed behavior
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

https://codepen.io/smfr/pen/VwyzQvb

https://www.w3.org/TR/css-contain-1/#layout-containment says that layout containment creates containing block for position:fixed. That doesn't work in WebKit.

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