I've encoutered something wierd.
IF you go into this link : http://www.pointer4u.co.il/ifleet and you add it to home screen, when you open the app it dosen't open up the browser and opens it up like a real native app, which i find is amazing for distribution of internal apps.
Now this web app (when added to home screen) not only hides the UI components but also presents a loading screen while loading it and not the regular browser loading display.
Another example you can find Here
How did they do that?