[Webkit-unassigned] [Bug 210368] New: position:sticky prematurely unsticks in height-set flex overflow chain

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210368

            Bug ID: 210368
           Summary: position:sticky prematurely unsticks in height-set
                    flex overflow chain
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kakolisgay at gmail.com

position:sticky prematurely un-sticks if placed in an overflow:scroll with-in a flex with-in a overflow:hidden flex with a set height. Once scrolled past the set height of the flex, the sticky will stop following the top of the viewport

Not entirely sure why this happens. Blink isn't effected. Tested on Chromium, Safari Preview, and GNOME Web.

https://jsfiddle.net/od09pkrv/1/

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