HTML5 Cache — Is it possible to have several distinct caches for a single URL?

Question

Every URL can be linked to a single cache manifest. But I want several cache manifests linked to a same URL. Here is the reason:

Some files I want to be cached are r

Answer 1

If the Iframe trick does not work, use the HTML5 FileSystem API

See http://updates.html5rocks.com/2012/04/Taking-an-Entire-Page-Offline-using-the-HTML5-FileSystem-API