I don't think that works when Apple have implemented notifications on MacOS Safari for years. So it's not that Apple disagree with the standard, but they don't

I don't think that works when Apple have implemented notifications on MacOS Safari for years. So it's not that Apple disagree with the standard, but they don't want to bring it to iOS. Apple are even on the WHATWG standards body that defined notification spec: https://notifications.spec.whatwg.org/ https://notifications.spec.whatwg.org/ . And WHATWG is the actual standard, not a non-standard standard. W3C ceded to them a few years ago, which is news to me. If we were talking about other features, like Web Bluetooth or Web HID which are just drafts on W3C but Google decided to implement anyways, I wouldn't disagree with you. I use Firefox myself, so none of these are supported on Firefox either.