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

Here is the behavior that I see on Mac (tested with https://domeventviewer.com/mouse-event-viewer.html):

When the `contextmenu` handler calls preventDefault:

| Browser | Action | Events | Notes |
| --- | --- | --- | --- |
| Firefox | Click |  `mousedown`, `mouseup`, `click` | |
| Firefox | Ctrl+click |  `mousedown`, `contextmenu`, `mouseup`, `auxclick` | |
| Firefox | 2-finger trackpad click |  `mousedown`, `contextmenu`, `mouseup`, `auxclick` | |
| Safari | Click |  `mousedown`, `mouseup`, `click` | |
| Safari | Ctrl+click |  `mousedown`, `contextmenu`, `mouseup`, `click` | `click` should be `auxclick` |
| Safari | 2-finger trackpad click |  `mousedown`, `contextmenu`, `mouseup` | No `auxclick` |
| Chrome | Click |  `mousedown`, `mouseup`, `click` | |
| Chrome | Ctrl+click |  `mousedown`, `contextmenu`, `mouseup` | No `auxclick` |
| Chrome | 2-finger trackpad click |  `mousedown`, `contextmenu`, `mouseup`, `auxclick` | |

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.

When the `contextmenu` handler does *not* call preventDefault:

| Browser | Action | Events | Notes |
| --- | --- | --- | --- |
| Firefox | Click | `mousedown`, `mouseup`, `auxclick` | |
| Firefox | Ctrl+click | `mousedown`, `contextmenu`, `mouseup`, `auxclick` + menu | |
| Firefox | 2-finger trackpad click | `mousedown`, `contextmenu`, `mouseup`, `auxclick` + menu | |
| Safari | Click |  `mousedown`, `mouseup`, `click` | |
| Safari | Ctrl+click |  `mousedown`, `contextmenu` + menu | No `auxclick`. No corresponding `mouseup` |
| Safari | 2-finger trackpad click |  `mousedown`, `contextmenu`  + menu | No `auxclick`. No corresponding `mouseup` |
| Chrome | Click | `mousedown`, `mouseup`, `click` | |
| Chrome | Ctrl+click | `mousedown`, `contextmenu` + menu | No `auxclick`. No corresponding `mouseup` |
| Chrome | 2-finger trackpad click | `mousedown`, `contextmenu`  + menu | No `auxclick`. No corresponding `mouseup` |

Again, Firefox has the most consistent behavior. Safari and Chrome produce `mousedown` events without corresponding `mouseup` events. Whether or not the context menu is shown (i.e.: whether or not the default actions occurs) should not affect the `auxclick` event. So Firefox's behavior seems correct here.

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