[Webkit-unassigned] [Bug 201770] New: PointerEvent.buttons incorrect on touch move

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201770

            Bug ID: 201770
           Summary: PointerEvent.buttons incorrect on touch move
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ian at ianbellomy.com

Created attachment 378752

  --> https://bugs.webkit.org/attachment.cgi?id=378752&action=review

Small example reproducing the issue

In the iOS13 iPhone simulator at least, the value of the 'buttons' property of a pointermove event generated by a moving touch is 0, but according to the W3C spec it should be 1. It appears to be 1 in Chrome (android simulator and on desktop in touch simulation mode). 

Example attached. 

This discrepancy leads to a project bug in the simulator that matches a bug on an iPad running 13.1. (I'll confirm its the same issue once I get a chance to plug the device in.)

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