If you're using eval() you can cache scripts wherever you want! I personally prefer IndexedDB but there's nothing stopping you from using localStorage or a even

If you're using eval() you can cache scripts wherever you want! I personally prefer IndexedDB but there's nothing stopping you from using localStorage or a even a service worker (with a little bit of cache trickery). Also, if you use a websocket you can pretty much forget about the content security restrictions. Websockets have no origin restrictions so you can load whatever you want from anywhere.