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

Let's try to get some momentum going on this one again :)

@NavidZ, mind chiming in with your thoughts?

@masayuki-nakano, what do you think about the concern @RByers raised?

For what it's worth, I feel Rick has a good point and suggestion here. I feel that the default behavior should be consistent, as in my experience working on webcompat, web pages almost always presume pixel values and aren't even aware that there are other potential units. I feel that making the existing property a legacy (and pixel-only) value would be best, along with new properties that are specific to the units.

In fact I wonder if there is even a need to have "pages" and "lines" values at all (as well as a variable default unit)? I also wonder if they aren't a potential fingerprinting vector in some way?

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