[Bug 23259] New: Expose ticks in wheel events

https://www.w3.org/Bugs/Public/show_bug.cgi?id=23259

            Bug ID: 23259
           Summary: Expose ticks in wheel events
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DOM3 Events
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected], [email protected]

We should consider adding |ticks| to the wheel event.

There are many UX use cases where ticks are more appropriate than pixels,
especially considering that pixel values vary from system-to-system (and can
vary based on user preferences).

An example of when ticks are more appropriate is with a "digit-selector", a
menu or a drop-down list. In each of these cases, a single tick should select
the next element regardless of how many "pixels" are reported.

Issues:
What ticks value should be used for input devices that fake scrollwheel events
(like a touchpad)?  Options are to simply use 0 ticks for these devices, come
up with a method for generating fake ticks.

Do we need x, y and z ticks?

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