[w3c/uievents] We don't have a definition for "contextmenu" event (#279)

Apparently no spec defines `contextmenu` event!  The event is marked as a `MouseEvent` in a non-normative [section](https://html.spec.whatwg.org/multipage/indices.html#event-contextmenu) in the HTML spec, that's it.

As of today, it seems UI Event spec would be the place for it because the event is a MouseEvent in all major browsers.  Note, however, that we are planning to change it to a PointerEvent, see https://github.com/w3c/pointerevents/issues/100.

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