The title of this book is completely in place. That is what exactly what you have in this book, coverage of every aspect of the media elements in HTML5.
There are small examples for every part that make it more clear. Also there are pictures that make you understand much easier what the author is talking about. Every aspect of the video, audio and device element is covered. The comparison with the browsers is from 2010 (with the book was written) and it won't be of much help if you read it now.
All in all highly recommendable book.