AppCache Browser support is gradually being dropped, and is not in the HTML5 spec. Service Workers are the favoured replacement, although that's a bit of a hill to climb and might take some work, despite optimistic Service Worker guides. Since a technology in transit will be hard to rewrite, maybe a 'heads-up' summary of the current state at the start of Let’s Take This Offline is the best approach at this stage?
AppCache Browser support is gradually being dropped, and is not in the HTML5 spec. Service Workers are the favoured replacement, although that's a bit of a hill to climb and might take some work, despite optimistic Service Worker guides. Since a technology in transit will be hard to rewrite, maybe a 'heads-up' summary of the current state at the start of Let’s Take This Offline is the best approach at this stage?