In an earlier post, I explained how to use cache-manifest for localstorage. Once you've achieved this, you'll find that in order to continue editing the site that the cache manifest will need to be removed. Otherwise, you won't see your changes. To do this in Chrome, you need to put this command in the address bar:
chrome://appcache-internals/
This will list all the sites in your application cache with a 'remove' link.
A full list of such commands, enter chrome://chrome-urls/