HTML 5 and HTTPS

Is it possible to use the offline featur开发者_运维技巧es of HTML 5 to securely cache and access resources served over HTTPS when offline? Is the local cache encrypted/secure? Are there any gotchas that I should be aware of?

I don't think the local cache is encrypted. It's the browser's responsibility to protect your data from other websites (like cross-origin), but it doesn't protect your data from whoever has the privilege to access your file system or memory.