There is also extensive advice on planning your site design, knowing your audience, and doing e-business. The basic approach writer for effective web design is what he terms "cross-compatibility concept," which is based on two principles: creating valid code in the first place and creating code that would cause an older browser to either pass on content can 't handle the or offer "graceful degradation." This contrasts with a similar book, which suggests serving up different content depending on the user's browser. This book is intended for those who have used Web layout applications like GoLive, Dreamweaver, or FrontPage, but now wants to know more about the underlying code; s as well as people who might already know HTML but want to learn proper XHTML, especially as step toward Learning XML. Beginners will find the book rigorous, but Webmasters will appreciate the chapter on code validators and how to interpret the error report, and that the increased accessibility of a site for the disabled. Although less effective in dealing with basic design issues like balance and visual unity (it'll mark for business) or homemade (obviously non-slick) look of site design and graphic examples, this book does not provide when it comes to fussy on the details of XHTML. CD-ROM contains code referred to in this book, along with many shareware and trial copies of Web utilities for FTP, code validating, browsers, and other useful applications.