[Webkit-unassigned] [Bug 209376] New: Text content not getting updated in sticky element.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209376

            Bug ID: 209376
           Summary: Text content not getting updated in sticky element.
           Product: WebKit
           Version: Safari 13
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jianbo.wu at shopee.com

When updating HTML content and sticky status at the same time in a macrotask/microtask (e.g. setTimeout or Promise.then), the value shown on the screen seems to be stale value. (still 0)

Code sandbox: https://codesandbox.io/s/focused-solomon-z3i79

To replicate the issue, open this link in Safari: https://z3i79.csb.app/ (a popped out version of the sandbox above)

Observation:

- In other browsers, the text content of that sticky footer should be 1.
- In safari, it's 0, until user scroll to bottom.

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