[Webkit-unassigned] [Bug 262089] New: PointerEvent.button should be -1 when mouse buttons are in released state

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=262089

            Bug ID: 262089
           Summary: PointerEvent.button should be -1 when mouse buttons
                    are in released state
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: a_protyasha at apple.com
                CC: a_protyasha at apple.com,
                    webkit-bug-importer at group.apple.com

The pointerevents/pointerevent_attributes_hoverable_pointers.html?mouse WPT is failing with (among other things) this error message:

```
mouse <pointereventtype>.button is -1 when mouse buttons are in released state. (Expected -1 but got 0)
```

This failure can be observed for all pointer event types bar `pointerup` and `pointerdown`, and hits to us not faithfully reproducing the `button` property as specified in the Pointer Events W3C spec: https://w3c.github.io/pointerevents/#the-button-property.

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