This is a great book for an experienced Web developer. The authors take special pains to draw attention to what's new in HTML 4 and to indicate what works in each browser (and browser version). This book is always within reach of my computer. The index is excellent and the explanations and examples are clear and relevant. The appendices are also very helpful in showing what works in which browser.
I've seen many HTML books and this is the best one out there. So many of the books that are sold as HTML 4 books are really just re-packaged HTML 3.2 books. This one was written for HTML 4, which is really a different animal than HTML 3.2 It includes a comprehensive section on Cascading Style Sheets (CSS), the Document Object Model (DOM), and Javascript, and how the three work together to make Dynamic HTML.
If you only buy one HTML book, this should be it!
What I really like about this book is that it is so comprehensive. It discusses issues related to helping Web site visitors navigate around your site in greater depth than any other book I've seen. It really has some great insights. It also has heavy-hitting chapters about CSS and dynamic HTML. This book tackles both advanced issues and the basics in a way that is easy to read and great for future reference. I can't recommend it enough.