[Webkit-unassigned] [Bug 220194] `PointerEvent.movementX` always 0

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220194

--- Comment #6 from Lucas Garron <lgarron at chromium.org> ---
I'd also like to add that none of the following are effective for feature detection:

- `"movementX" in e`
- `e.movementX !== "undefined"`
- `e.hasOwnProperty("movementX")`

The fact that `movementX` can be an incorrect of `0` instead of `undefined` means that I can't trust a numerical value without something like UA sniffing, which should really be an anti-pattern at this point. :-/

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