I bought this book hoping that it would teach me to build a correct XHTML web site. I must say that I'm very pleased with it but probably for the wrong reasons. It does focus on XHTML but not as much as one would expect. Being XHTML the current version of HTML it is incredible the amount of text dedicated to cover HTML 4. Although the autor's point out once or twice that this or that procedure is not correct anymore, they keep insisting on using those deprecated methods on many of the examples troughout the book. On the other hand the book covers so many subjects that are helpfull even if they only scratch the surface. Usability, Accessibility, XML and and other essential subjects are addressed in a way that is very easy to understand and gives you a start on those subjects.
Good if you are a novice web developer, not very helpfull if you already know the basics and want to learn Strict XHTML.