[Webkit-unassigned] [Bug 220196] New: [iOS] #setPointerCapture does not dispatch pointer events outside element boundary

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220196

            Bug ID: 220196
           Summary: [iOS] #setPointerCapture does not dispatch pointer
                    events outside element boundary
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joytzhong at gmail.com

See https://codepen.io/joyzhong/pen/ZEpvdEx. Note that the pointerup event is not dispatched to the red element after setting pointer capture on red, IF the pointerup occurred outside of the red element bounds.
Note that this only happens on iOS, not MacOS.

Context: This results in buggy sliders for MDC (Material Design Components) Web.
Original issue: https://github.com/material-components/material-components-web/issues/6715

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