Have you read at least the titles of the chapters of the book?

Or the official Apple documentation (http://developer.apple.com/safari/)?

http://developer.apple.com/safari/library/samplecode/iPhoneO...

http://developer.apple.com/safari/library/documentation/Appl...

Edit: where in the book did you see how to use geolocation, vibration or any other feature which is not available with a web app developed for mobilesafari?