Update: Together with Udacity I created a free offline-first interactive course. It involves taking an online-only site to full offline-first glory. Many of the patterns in this article are used. When AppCache arrived on the scene it gave us a couple of patterns to make content work offline. If those were the patterns you needed, congratulations, you won the AppCache lottery (the jackpot remains unclaimed), but the rest of us were left huddled in a corner rocking back & forth.