All promise rejections should say what they're rejected with

[toji]

From @foolip on September 20, 2016 8:49

https://w3c.github.io/webvr/#dom-vrdisplay-requestpresent
https://w3c.github.io/webvr/#dom-vrdisplay-exitpresent
https://w3c.github.io/webvr/#navigator-getvrdisplays-attribute

Some spec editors (@annevk) like TypeError for everything, but for user gesture there's precedent in HTML to use NotAllowedError.

Copied from original issue: immersive-web/webxr#90

[toji]

From @annevk on September 20, 2016 15:1

But at a minimum, we should always reject with an Error class/subclass.