Earlier quoted context omitted.
Just to add: - Getting notifications from websites I want notifications from This should not be impossible just because there are 5 trillion websites I don't want notifications from.
The problem is, that you can always "force" the user to allow you notifications or cannot proceed. And $GREEDY_MEGACORP would abuse their power and send you a "verification code" through the push notification, else you cannot process the signup etc. The good thing about the Apple Appstore, that promotional/marketing push notifications are forbidden and will get your App banned from the Appstore. Just allowing generic…
Can you though? Wouldn't it be enough to create interface that would let you view notifications of currently opened tab without giving it permission to show them through OS interface in background?