Background syncThe background synchronization API registers a service worker callback to run only when the device is no longer offline. You can use this to let users continue using your app while offline and synchronize with a server after reconnecting.limitedhttps://wicg.github.io/background-sync/spec/https://developer.mozilla.org/docs/Web/API/SyncEventapi.Permissions.permission_background-syncapi.ServiceWorkerGlobalScope.sync_eventapi.ServiceWorkerRegistration.syncapi.SyncEventapi.SyncEvent.SyncEventapi.SyncEvent.lastChanceapi.SyncEvent.tagapi.SyncManagerapi.SyncManager.getTagsapi.SyncManager.registerapi.SyncManager.worker_supporthttps://nowyoucanuse.com/features--background-sync.html