The book consists of introduction to HTML5 technology and its usage in game development area. The book contains six complete game examples. The games are simple enough to understand and recreate, but are feature complete and working. The examples are picked to demonstrate different HTML5 features (CSS3, Canvas, Audio, LocalStorage and WebSockets). The material is based on JQuery library usage and explains its basics as well. Typical game programming approaches like event loops, layered rendering and impact collisions are covered.
Because the examples in the book are not hardcore, the book could be used as an introductory HTML5 material even for those who are not going to write computer games. The game examples just make the learning process more fun and inspirational.
I would recommend this book to anyone interested in learning HTML5 features just before those will get mainstream. This is a great introductory material, which you could use as a starting point to your HTML5 experience. The game examples make this book entertaining to read.