The web is dead. All hail the Chrome Platform, where the official definition of correct behaviour is “whatever Chrome does.”
How dare Apple force web developers to target more than one browser engine. Interoperability and platform agnosticism is for losers.
It's becoming increasingly clear that the vast majority of web developers are now exclusively using Chrome and resent the idea of testing elsewhere.
(Of course usually when one delves into exactly what features Safari is missing, specifically the ones which piss off web developers, it’s push notifications. And to that I salute Apple for bravely holding the line against that nonsense.)
IIRC push notifications are supported in Safari.