Should there be a vrdisplaypresenterror event?

[cvan]

For measure, the Fullscreen API has the following events:

• fullscreenchange
• fullscreenerror

For the WebVR API, we have

• vrdisplaypresentchange
• vrdisplaypresenterror - should we support this?

If someone calls vrDisplay.requestPresent() and it rejects (or possibly if it throws too), I would hope for an event to fire. Otherwise, I'll have to rely on Promises entirely and interface with these methods directly, at which point the events become not that useful.

[toji]

To be honest I'd prefer to reply on the promise entirely, but that's not a viable option for vrdisplaypresentchange. The issue is that the browser may force you our of VR presentation at any time for any reason (most likely the user hit some explicit "Exit WebVR" button, like tapping esc to exit fullscreen). We can add an error event, certainly, but I don't see it filling an explicit need like the presentchange event does.

[toji]

Brought this up at the WebVR F2F in Kirkland. Room agreed with assessment above. Closing as will not implement.