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

I would like to also add that on macOS the scroll direction can be flipped (natural vs normal) which renders scroll-based interactions that don't scroll content (as @trusktr mentioned) inconsistent unless the scroll event includes this information (if the direction is flipped). Not to mention macOS's inertial scrolling.

For context, I'm a developer of an online data visualizer for exploring satellite data on a map (the [Ocean Virtual Lab](https://ovl.oceandatalab.com) is an example). The scroll interaction is used in multiple components:

* to zoom the map in/out (changes in steps, not continuously)
* to change the transparency of a layer (changes continuously)
* to change the current time (changes continuously)
* to change the value of `<input type=range>`-like inputs (changes in steps, or continuously)

And I have yet to find a way to iron-out the inconsistencies in scroll events between different browser and platforms 😔

PS: I apologize if these problems are out-of-scope for this issue, I just don't know where else to go

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