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

(Sorry, I didn't realize the mention here.)

Yes, sounds like that's great idea. I agree with it.

However, I have a concern about implementing it. For making it, each implementation should have computed value of `lineDeltaX/Y` and `pageDeltaX/Y` or line height or page height/width for computing them later since events may be stored with variables and may be referred later (i.e., after ending the propagation).

I don't mind the cost as a developer of Mozilla DOM Events, but I'm not sure how other browser developers.

And in my understanding, the line height, page width and page height values are used the value **at** dispatching `wheel` event rather than the attributes are accessed. So, I hope that UI Events should define:
1. **When** these reference values are fixed.
2. **Which** element's size should be referred (Event.target? Nearest ancestor scrollable Element? Root element?).

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