The backgroundfetchabort event of the ServiceWorkerGlobalScope interface is fired when the user or the app itself cancels a background fetch operation.

This event is not cancelable and does not bubble.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("backgroundfetchabort", (event) => {});

onbackgroundfetchabort = (event) => {};

A BackgroundFetchEvent.

Inherits properties from its parent, ExtendableEvent.

BackgroundFetchEvent.registration

Returns the BackgroundFetchRegistration for the aborted fetch.

In the background fetch API, the browser shows a UI element to the user to indicate the progress of the operation. This element also enables the user to cancel the fetch. The app itself can also cancel the fetch by calling BackgroundFetchRegistration.abort().

If the fetch is canceled, the browser aborts the fetch, starts the service worker, if necessary, and fires the backgroundfetchabort event in the service worker's global scope.

In the handler for this event, the service worker can clean up any related data for the operation. It can also retrieve and store any successful responses (for example, using the Cache API). To access the response data, the service worker uses the event's registration property.

This event handler might perform any cleanup of data associated with the aborted fetch.

addEventListener("backgroundfetchabort", (event) => {
  // clean up any related data
});

• Background Fetch API