[Webkit-unassigned] [Bug 267008] New: PointerEvent pointerup `button` value does not match pointerdown

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=267008

            Bug ID: 267008
           Summary: PointerEvent pointerup `button` value does not match
                    pointerdown
           Product: WebKit
           Version: Safari 17
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.sarris at gmail.com

Created attachment 469266

  --> https://bugs.webkit.org/attachment.cgi?id=469266&action=review

Reproducible example

This is a regression. All browsers (and Safari used to) match PointerEvent.button for corresponding pointerdown and pointerup events.

This means that a right click will be button = 2 for the pointerdown, but button = 0 for pointerup. This will break JavaScript that expects to do right-click events on pointerup.

A very basic reproducible example is attached. Allegedly this worked correctly in Safari 16.5 (I have not tested) but now fails in 17.2.1 (I have tested).

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