[Webkit-unassigned] [Bug 198965] New: Pointer Events incorrectly handles simultaneous mouse buttons (TP 85)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198965

            Bug ID: 198965
           Summary: Pointer Events incorrectly handles simultaneous mouse
                    buttons (TP 85)
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ashley at scirra.com

Demo: https://www.scirra.com/labs/bugs/safaripointerevents.html
Look at console messages while following these steps:

1. Press down left mouse button and hold it
2. Press down right mouse button and hold it
3. Release left mouse button
4. Release right mouse button

Observed result:
The sequence of events is pointerdown, pointerdown, pointerup, pointerup

Expected result:
The sequence of events is pointerdown, pointermove, pointermove, pointerup. This is how it works in Chrome and Firefox.

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