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Declarative Web Push – WebKit
Web Push notifications are a powerful and important part of the web platform.
The code handling that event inspects the data in the push message, using it to make a call to ServiceWorkerRegistration.showNotification(...) to display the user visible notification. Most applications will find it straightforward to send the declarative standard JSON in their push messages and rewrite their service worker’s PushEvent handler to display it. This is quite similar to how Declarative Web Push notifications work on iOS after the website’s service worker JavaScript has been removed either by the user or by ITP.
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