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

FYI: As far as I've tested, deltaMode value of each browser:

- Windows (system setting is set to multiple line scroll)
  - Edge: `DOM_DELTA_PIXEL`
  - Chrome: `DOM_DELTA_PIXEL`
  - Firefox: **`DOM_DELTA_LINE`**
- Windows (system setting is set to per page scroll)
  - Edge: `DOM_DELTA_PIXEL`
  - Chrome: **`DOM_DELTA_PAGE`**
  - Firefox: **`DOM_DELTA_PAGE`**
- macOS (trackpad)
  - Safari: `DOM_DELTA_PIXEL`
  - Chrome: `DOM_DELTA_PIXEL`
  - Firefox: `DOM_DELTA_PIXEL`
- macOS (mouse)
  - Safari: `DOM_DELTA_PIXEL`
  - Chrome: `DOM_DELTA_PIXEL`
  - Firefox: **`DOM_DELTA_LINE`**
- Linux
  - Firefox: **`DOM_DELTA_LINE`**
  - Chrome: `DOM_DELTA_PIXEL`


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