Intent to ship: `movementX` and `movementY` of `pointerrawupdate` event

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Masayuki Nakano

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Dec 9, 2025, 11:36:36 PMDec 9

to dev-pl...@mozilla.org, Olli Pettay

Currently, `movementX` and `movementY` are supported only when `mousemove` or `pointermove` as defined by the spec. However, Chrome supports this and this is reported as a web-compat issue in the wild. I already filed the spec issue to change the spec. So, we think the Chrome's behavior is reasonable. Therefore, we'll follow them.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1987671

Standard: https://w3c.github.io/pointerlock/#extensions-to-the-mouseevent-interface

Spec issues: https://github.com/w3c/pointerlock/issues/100 and https://github.com/w3c/pointerevents/issues/535

Platform coverage: All

Preference: dom.event.pointer.rawupdate.movement.enabled

DevTools bug: N/A

Other browsers: Chrome has already support it with `pointerrawupdate`, I'm not sure about Safari.

web-platform-tests: No (The new behavior is tested with existing mochitests for now)

-- 
Masayuki Nakano <masa...@d-toybox.com>
Working on DOM, Events, editor and IME handling for Gecko

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