Building an offline page for theguardian.comHow we used service workers to build a custom offline page for theguardian.com. You’re on a train to work and you open up the Guardian app on your phone. A tunnel surrounds you, but the app still works in very much the same way as it usually would—despite your lack of internet connection, you still get the full experience, only the content shown will be stale. If you tried the same for a website,
UpUp - Offline First in 1 line of Javascript
Offline.js – Handle your users losing their internet connection like a pro
