Specifications for browser PUSH notifications

[Mafioziks]

Right now webdrivers does not give opportunity to handle PUSH notifications. As there was mentioned that it might need to be suggested to w3c group to add this part to specifications to get that implemented I am adding here as an issue.

Problem shows that as here is not specifications for browser PUSH notifications for webdrivers than they are not implemented and it is not possible to test PUSH notifications with selenium.

[shs96c]

This is out of scope for level 1, but might fall into level 2.

[ergbouncex]

This would be a great addition.