Bug 267008 – REGRESSION(268459@main): PointerEvent pointerup `button` value does not match pointerdown

• Status: RESOLVED
• Resolution: FIXED
• Component: UI Events

[Simon Sarris]

Created attachment 469266 [details]
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).

[Radar WebKit Bug Importer]

<rdar://problem/120429508>

[Abrar Rahman Protyasha]

Thanks for the bug report -- I suspect this is related to the changes introduced for webkit.org/b/262109 or webkit.org/b/262089 (or both). Investigating.

[Abrar Rahman Protyasha]

Works: 268458@main
Fails: 268459@main

So, the regression point is 268459@main, which makes sense given the nature of the change. It looks like some state in PointerCaptureController is broken, which I will investigate shortly.

[Abrar Rahman Protyasha]

Pull request: https://github.com/WebKit/WebKit/pull/22988

[EWS]

Committed 273263@main (29875ec3a594): <https://commits.webkit.org/273263@main>

Reviewed commits have been landed. Closing PR #22988 and removing active labels.

[Abrar Rahman Protyasha]

Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/44124