[osrec]

We use indexeddb, which is generally okay, but you're right, the DB size can vary across browsers (I think some limit to 10mb, and others to half the HDD). For our use case, it was good enough. Our strategy is to try and cache things offline, but if indexeddb fails to store the data, we attempt to fetch from the server. As the saying goes, cache invalidation is hard, but that's true regardless of the platform.