In other words, its a marketing dept's dream!
This book hasn't been updated since 1998, and hasn't kept pace with technology.
..., the last chapter on DHTML is entitled "Looking Ahead to HTML 4.0" We're beyond HTML 4.0 and on to XHTML, XML, etc.!
The CSS/DHTML sections are somewhat harder to use. I sometimes have to look several places to find what I am looking for. It is a better reference than guide or tutorial. If I was going to work on a complex DHTML project I would look for another (perhaps newer) reference.