/mdn-git/developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerGlobalScopeServiceWorkerGlobalScope
activate_event backgroundfetchabort_event backgroundfetchclick_event backgroundfetchfail_event backgroundfetchsuccess_event canmakepayment_event clients contentdelete_event cookiechange_event cookieStore fetch_event install_event message_event messageerror_event notificationclick_event notificationclose_event paymentrequest_event periodicsync_event push_event pushsubscriptionchange_event registration serviceWorker skipWaiting sync_event