[Webkit-unassigned] [Bug 226816] New: [iOS 15 Regression]: scroll position resets when using scroll snap

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226816

            Bug ID: 226816
           Summary: [iOS 15 Regression]: scroll position resets when using
                    scroll snap
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ldebeasi at gmail.com
                CC: simon.fraser at apple.com

On iOS 15 beta 1, it appears that scroll snapping is broken and resets the scroll position whenever you try to scroll.

Steps to reproduce:

1. Open https://webkit.org/demos/scroll-snap/ on a device running iOS 15.
2. Go to the second demo (the one that says "This second container shows what basic scroll snapping can do for us")
3. Try to scroll.
4. Observe that the scroll position is reset to the beginning when you let go of the screen.

Expected Behavior:

I would expect that scrolling continues until the container snaps into place.

Actual Behavior:

Scrolling resets to the beginning. Alternatively, it could be that WebKit is snapping back to the first element, but I am not entirely sure.

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