Background fetchBackground fetch downloads data in the background even when the web page is closed.limitedhttps://wicg.github.io/background-fetch/https://developer.mozilla.org/docs/Web/API/BackgroundFetchEventapi.BackgroundFetchEventapi.BackgroundFetchEvent.BackgroundFetchEventapi.BackgroundFetchEvent.registrationapi.BackgroundFetchManagerapi.BackgroundFetchManager.fetchapi.BackgroundFetchManager.getapi.BackgroundFetchManager.getIdsapi.BackgroundFetchRecordapi.BackgroundFetchRecord.requestapi.BackgroundFetchRecord.responseReadyapi.BackgroundFetchRegistrationapi.BackgroundFetchRegistration.abortapi.BackgroundFetchRegistration.downloadTotalapi.BackgroundFetchRegistration.downloadedapi.BackgroundFetchRegistration.failureReasonapi.BackgroundFetchRegistration.idapi.BackgroundFetchRegistration.matchapi.BackgroundFetchRegistration.matchAllapi.BackgroundFetchRegistration.progress_eventapi.BackgroundFetchRegistration.recordsAvailableapi.BackgroundFetchRegistration.resultapi.BackgroundFetchRegistration.uploadTotalapi.BackgroundFetchRegistration.uploadedapi.BackgroundFetchUpdateUIEventapi.BackgroundFetchUpdateUIEvent.BackgroundFetchUpdateUIEventapi.BackgroundFetchUpdateUIEvent.updateUIapi.ServiceWorkerGlobalScope.backgroundfetchabort_eventapi.ServiceWorkerGlobalScope.backgroundfetchclick_eventapi.ServiceWorkerGlobalScope.backgroundfetchfail_eventapi.ServiceWorkerGlobalScope.backgroundfetchsuccess_eventapi.ServiceWorkerRegistration.backgroundFetchhttps://nowyoucanuse.com/features--background-fetch.html