Re: [w3c/uievents] Needs alternative WheelEvent.deltaMode, WheelEvent.delta(X|Y|Z) (#181)

I fell down this rabbit-hole again recently and found a (mostly) undocumented but interoperable behavior:
Pinch gesture on an Apple trackpad generates a `wheel` event with its `ctrlKey` set to `true` (even when the control key is not pressed).

* #31 (main issue discussing this behavior)
* #337 (somewhat related)

Tested on a M1 MacBook Air with macOS Sonoma 14.6.1
* Firefox Developer Edition v131.0b9
* Google Chrome v128.0.6613.85
* Safari v18

I found this while trying to understand how tldraw is able to distinguish between a two-finger pinch and a two-finger drag.

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