@Hugh: Yeah, sorry, that comment was meant to be a little tongue-in-cheek… It is true that the link does not provide anything like a polyfill for appcache, but what it provides is an alternative recommendation for appcache-like behavior. With the code provided browsers could replicate what appcache is supposed to do, only much easier, and be backward compatible (meaning, don’t break older browsers).

Cheers,
Atg