Re: [whatwg] Notifications: making requestPermission() return a promise

On 10/1/14, 1:59 PM, David Dorwin wrote:
> Rejection also has the advantage of providing an exception, which can
> provide information (reason and message) to differentiate between
> potentially multiple causes. This is not possible when resolving with null.
> Providing such information would likely make development and debugging
> easier.

If you were designing a sync API, would not the same arguments apply? 
So you'd want to throw different kinds of exceptions to indicate "not 
supported"?

-Boris