If you’re using iOS >= 6 and you have mountain lion (10.8) or Safari >= 6, you can just:

  1. Open the application in the simulator (or your device in XCode >= 4.5.x).
  2. Open Safari on your Mac: Go to Preferences -> Advanced and make sure “Show Develop Menu in Menubar” is on.
  3. From the Menu bar (of Safari) select Develop -> iPhone Simulator -> [your webview page].

That’s it!