the widespread indicators of browser compatibility are invaluable
I found it hard to fault this book since it does exactly what it says on the tin (well, the back cover). If there is a problem, it is that the book is too big.
This is mainly a reference book. The 200 pages of guidance at the start is not a beginner's tutorial, so if you are new to any of the technologies covered, you should look elsewhere for a gentle introduction. But you will probably want this by your side as well. The guidance on, and widespread indicators of browser compatibility are invaluable and are themselves a good enough reason to buy the book.