HTML Refresher and Detailed Study - Part 7
Last updated on 10 May 2026 Minor update on 13 May 2026 Post series: Part 1 , Prev Part (6) Contents Top-Level design of chat application with offline support using WebSockets and Service Worker Design of chat application with offline support using WebSockets and Service Worker Very Basic Service Worker Very basic Service Worker example with only console logs Calling register() on every page load is not a problem skipWaiting() forcibly removes old service worker version but has risk of mismatch with other app JS code Activate event is fired when browser promotes installed script to active worker if ('serviceWorker' in navigator) is best practice for feature detection Automatic Service Worker uninstallation (unregistration) is rare Large number of registered Service Workers in Chrome is normal and not a performance drain Unused service worker should be unregistered manually as automatic cleanup may not happen Service Worker status chang...