[Webkit-unassigned] [Bug 231493] New: Sticky element nested inside a sticky container is jumpy

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231493

            Bug ID: 231493
           Summary: Sticky element nested inside a sticky container is
                    jumpy
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jtran040 at gmail.com
                CC: simon.fraser at apple.com

Created attachment 440743

  --> https://bugs.webkit.org/attachment.cgi?id=440743&action=review

a screencast

It is similar to bug : https://bugs.webkit.org/show_bug.cgi?id=197660

However this one occurs in Safari 15 with a Mac(Intel).

Example URL: https://x80lf.csb.app

Steps to reproduce:
1. Open attached url
2. Scroll vertically

What is the expected behaviour?
The fixed purple cell should remain in the same position when scrolling.

What went wrong?
The fixed purple cell is jumpy and disappears and then reappears while scrolling fast with the mouse wheel.


If you remove position:sticky from the outside container, then it works as expected.

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