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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/BackgroundFetchEvent below:

BackgroundFetchEvent - Web APIs | MDN

Limited availability

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Note: This feature is only available in Service Workers.

The BackgroundFetchEvent interface of the Background Fetch API is the event type for background fetch events dispatched on the service worker global scope.

It is the event type passed to backgroundfetchclick event and backgroundfetchabort event.

BackgroundFetchEvent() Experimental

Creates a new BackgroundFetchEvent object. This constructor is not typically used, as the browser creates these objects itself and provides them to background fetch event callbacks.

Also inherits properties from its parent, ExtendableEvent.

BackgroundFetchEvent.registration Read only Experimental

Returns the BackgroundFetchRegistration that the event was initialized to.

Also inherits methods from its parent, ExtendableEvent.

None.

In this example, if the user clicks on the user interface displaying the download progress, a new window will open. The current BackgroundFetchRegistration is returned by calling event.registration.

addEventListener("backgroundfetchclick", (event) => {
  const bgFetch = event.registration;

  if (bgFetch.result === "success") {
    clients.openWindow("/latest-podcasts");
  } else {
    clients.openWindow("/download-progress");
  }
});

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