Re: [w3c/uievents] Introduce contextmenuclose or similar event. (#309)

@hober I think I may have not correctly grok'd your idea initially. To restate, we would add a `dismiss` event which would be fired when dialog or custom modals are closed, and could also be fired in these cases where a contextmenu should be dismissed? The firing of this dismiss event would not cause anything to close unless the developer handled that event by doing so.

Given this, a developer implementing a custom contextmenu would listen to the `dismiss` event and close their custom contextmenu UI in response. They would also need to make sure that pressing escape dismisses their contextmenu UI and not another dialog or popup element showing on the page. They would also need to make sure that they close their contextmenu UI if another element is focused or if focus of the window is lost.

My main concern is where the developer would see the dismiss event dispatched from. Presumably it would be the element which had the contextmenu event. However, if so, if that element was also a dialog element how would they listen for a dismiss of the contextmenu and not the dialog, or vice versa? My presumption is that contextmenu dismissal would have a different target but I'm not sure what that would be if you right clicked on the root of a dialog.

e.g.
```html
<dialog> <!-- right click in here --> </dialog>
```

@mustaqahmed Another awkwardness (probably unavoidable) is that the browser wouldn't know if a custom contextmenu has been dismissed within the application so the developer may see a spurious dismiss / contextmenuclose event sometime later long after their custom contextmenu was dismissed internally within the application.

Would it make sense to start a PR for the contextmenuclose event and discuss / comment there with issues / ideas for how to deal with these issues.

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