47 • Notification API • https://notifications.spec.whatwg.org/ • Notifications API • https://developer.mozilla.org/en-US/docs/Web/API/Notifications_API • Service Workers • https://www.w3.org/TR/service-workers/ • Service Worker API • https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API • Push API • https://www.w3.org/TR/push-api/ • Push API • https://developer.mozilla.org/en-US/docs/Web/API/Push_API