The user closes the browser tab and your excellent frontend app immediately disappears. But what if you want to build even better UX by keeping a portion of your app always alive – to send & receive events, finish network operations, and run some code even when a user does not have your website open? During my session, let’s explore all the possibilities we have in the Service Worker-driven APIs to run some parts of the applications as background services. All for good: to keep the app itself and content always fresh, network operations – resilient, and user – notified.