Re: [w3c/uievents] Clarify whether a click event should be dispatched for `control` + click in Mac OS (#265)

> Overall, Firefox is the most consistent. Ctrl+click and 2-finger-click should act the same, but Chrome and Safari are not. Safari should send auxclick for non-primary mouse clicks.

Note that after https://bugzilla.mozilla.org/show_bug.cgi?id=1615732 Firefox dispatches mousedown/mouseup with button=0 (instead of button=2) for Ctrl+click, so we would dispatch `click` event then instead. 2-finger trackpad click behaves the same (mousedown/mouseup with button=2 and `auxclick`).

I test with https://domeventviewer.com/mouse-event-viewer.html on Firefox Nightly again.

Firefox = Nightly 80.0a1 (2020-06-29) 

### Click ###
type | button | buttons | ctrlKey
------------- | ------------- | ------------- | -------------
`mousedown` | 0 | 1 | false
`mouseup` | 0 | 0 | false
`click` | - | 0 | false

### Ctrl+click ###
When the contextmenu handler calls preventDefault:
type | button | buttons | ctrlKey
------------- | ------------- | ------------- | -------------
`mousedown` | 0 | 1 | true
`contextmenu` | - | 1 | true
`mouseup` | 0 | 0 | true
`click` | - | 0 | true

### 2-finger trackpad click ###
When the contextmenu handler calls preventDefault:
type | button | buttons | ctrlKey
------------- | ------------- | ------------- | -------------
`mousedown` | 2 | 2 | false
`contextmenu` | - | 2 | false
`mouseup` | 2 | 0 | false
`auxclick` | - | 0 | false

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