Introduction to Service Worker
Rich offline experiences, periodic background syncs, push notifications—functionality that would normally require a native application—are coming to the web. Service workers provide the technical foundation that all these features will rely on.
Push and Notifications
Push messaging allows developers to engage users by providing timely and customized content outside the context of the web page. Push and Notification are different, but complementary, functions: a push is the action of the server supplying message information to a service worker; a notification is the action of the service worker sending the information to a user.
Promises
Promises simplify deferred and asynchronous computations. A promise represents an operation that hasn't completed yet.
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