While I'm new to programming with HTML 5 (um, very new), I picked up this book because of my interest in programming games for mobile devices. That information isn't widely available online or in books, and so was well worth picking up this book over.
I was delighted to find that chapter was particularly robust. And since I have a general interest in learning the rest of the book's contents, I'm finding this a great read.
While many programming books are written in either a dry, technical style similar to a textbook, or in a chatty, dumbed-down style, this book takes the perfect middle road. It's factual, to the point, matter of fact and tells me everything I need to know in just the right order.
I'm finding the biggest strength of the book is its organized layout. It feels like reading a simple set of tutorials online, in the sense that it has bolded headlines to direct my eye where needed, information is broken up into short sections that are granular and cover one tight topic, and the code itself is laid out in a way that is easy to read. Tables and black and white photos are included where needed to break up the text and provide handy reference charts.
You know whether or not you want the book by the title, most likely, and are just reading reviews to see if there's anything wrong with this book. There's not. It's great. Pick it up and get programming.