title: iOS web app with offline cache and local storage
body: <p>I've already managed to program a webapp for personal use I'm really satisfied with. Not being something meant for public usage and distribution, I didn't want to go through the hassle of jailbreaking my device just to be able to run my own application, so I made this seamlessy looking and behaving webapp (and of course I've added it to the other apps saving it as a "Home application")</p>
  
  <p>Since the start time can be a bit slow and I'm constantly pushing my data from and to a remote server, can I <strong>force</strong> the usage of html5 offline browsing (with a cache manifest) even when I am online? Also, I'm thinking of persisting the data as local storage and from time to time synch it to the server. Since I've never used html5 local storage, how much reliable is it? Can I lose my data?</p>
  
  <p>Is this a viable pattern to quickly create a personal iPhone app? Thanks</p>