In https://github.com/slightlyoff/ServiceWorker/issues/127 it is suggested push API is incompatible with having multiple registrations per origin. That seems like a problem.

Another problem is it not defining the protocol between the browser-operated server and the site-operated server. That really needs to be included for this to be suitable for standardization.

Discussed in London; Alex did a review, and it is now on a good path.

Note that work on the protocol is just starting up in IETF.

Can close.