[Webkit-unassigned] [Bug 211049] New: trackpad momentum scrolling a nested, scroll-snap container also scrolls the ancestor scroll container

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=211049

            Bug ID: 211049
           Summary: trackpad momentum scrolling a nested, scroll-snap
                    container also scrolls the ancestor scroll container
           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: alex at boffinhouse.com

How to reproduce:

1. Open https://jsbin.com/kixoqexixo/edit?html,output
2. Scroll the area with the green rulers using your trackpad and with some velocity

What happens:
As soon as you stop scrolling and momentum scrolling kicks in the red rulers also start to scroll.

What is expected:
As long as the scroll was initialized by the inner nested scroll-snap container the ancestor should not be scrolled.

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