I could recommend this book to everyone who wants a high level overview of features introduced in HTML 5. Each feature has its own chapter. How to detect browser support for each feature, work around for older browsers (especially internet explorer) are also explained. The book does not go into details of each feature. You can buy the book or go to the book’s site which hosts full version of the book. My favorite chapter was new video element, it is a good introduction to codecs, containers and differences between platforms like, firefox, opera, internet explorer, safari, ios, android.