They are visually explanations as possible as we can. Point highlighted on the complex html source. You can get easily which part affects the result. It has html page samples for difficult parts to understand on the printed media. For example, link, frame, and some.
Acrobat bookmarks make it easy to jump to the other section of the document.
Bookmark is always displayed on the left side of the window, but you can hide it if you want. Also, you can jump from the top contents page and html tag list as same as html edition on the web. Support the standardized specifications, HTML2.0, HTML3.2, HTML4.01. Here is a complete pdf edition of NCD HTML Design Guide v5.0. Please download the archive which suitable for your system.