[Webkit-unassigned] [Bug 214726] New: scroll-snap jumpy with playing video content

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214726

            Bug ID: 214726
           Summary: scroll-snap jumpy with playing video content
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ben at benubois.com

Overview
--------

Scrolling is jumpy when playing a video inside of a container that uses `scroll-snap`. 


Steps to Reproduce
------------------

1. Visit https://codepen.io/asdf/full/WNrmdPK
2. Play the video
3. Scroll to the right and left repeatedly 


Actual Results
--------------

Scrolling appears to jump around with significant jank.


Expected Results
----------------

Scrolling is smooth


Build Date & Hardware
---------------------

iOS 14 (18A5319i) iPhone and iPad


Additional Builds and Platforms
-------------------------------

- iOS 14 developer beta 1-3
- iOS 14 public beta


Doesn't Occur On 
----------------

- iOS 13 or previous
- Safari Technology Preview Release 110 (Safari 14.0, WebKit 15610.1.21.0.2)


Additional Information
----------------------

Here's a video demonstration: https://www.dropbox.com/s/i1jr4nul4uf15xh/scrolling.mp4?dl=0

Please let me know if there's any more information I can provide.

Thanks!

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