An important detail that you might miss without reading the article is that these capabilities are not available to any website a user visits. The user must add the website to the their Home Screen before the website can ask for notifications permissions.
As an iOS user I actually like this restriction. Can't imagine what the browsing experience would've looked like if any website could take their chance on sending me notifications
As an iOS user I actually like this restriction. Can't imagine what the browsing experience would've looked like if any website could take their chance on sending me notifications