Granted, several technologies are not covered in this book, but then the title and descriptions do not advertise that they are covered. The title touts HTML, JavaScript and CSS for mobile development, and those topics are covered thoroughly with great everyday examples. You can't buy a book on baking cakes and then complain because you didn't learn how to bake pies.
This book covers a very wide topic from several angles. It covers how to create mobile Web pages and Websites, which is what it claims to do. It teaches you how to take your rudimentary HTML and CSS knowledge and apply it to mobile pages and sites--which is what the book claims it's about. It also covers a great deal about WebKit, using JavaScript for mobile sites, and where to find additional help. It is an entry-level book, and doesn't claim to teach you everything there is to know about mobile site development in a Dummies book with 480 pages.