[Webkit-unassigned] [Bug 202364] New: Position Sticky Block Container is incorrectly calculated

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202364

            Bug ID: 202364
           Summary: Position Sticky Block Container is incorrectly
                    calculated
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: damien at graycore.io
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Associated Article: https://medium.com/graycore-developer/sticky-yet-another-browser-inconsistency-f375b2e829d7
Example case: https://codepen.io/damienWebDev/full/GRKaMQd

As described in the article, `position: sticky` incorrectly calculates its `containing element` as described by the spec. It should search up the tree for its nearest "block" ancestor, and use that as the containing rectangle for `position:sticky`. 

I've tried this on the most reecent nightly, and the bug still exists.

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