Computer Tricks and Secrets

Short answer: modern websites can work offline by becoming Progressive Web Apps (PWAs), which use a "service worker" to cache the site so it loads with no internet. As a user you can install these to use them offline; as a builder you add a service worker and a manifest. Here is how both sides work. How a website can work offline A service worker is a small script the browser runs in the background. It caches your site's files (HTML, CSS, JS, images) on first visit, so on later visits, even with no connection, the browser serves the cached version. That is how apps like some note-takers, games and readers open instantly and work on a plane. For users: install offline-capable web apps Look for an Install icon in Chrome's address bar (or "Add to Home Screen" on mobile) on supported sites. Installed PWAs open like an app and often work offline. Great examples: offline-capable note apps, calculators, and reading tools. For builders: the three pie...