these are samples, not complete applications. The code (and coding style) is not meant to be industrial strength; it's not even well-designed. The sole purpose of the samples is illustrating a point, not teaching proper coding style.
Cascading Style Sheets (CSS) is a fantastic tool to add layout to your websites. It can save you a lot of time and it enables you to design websites in a completely new way. CSS is a must for anyone working with web design.
"When the lady at the corner market runs the package over the scanner (or whatever it is they do in your area), the computerized cash register reads the UPC code as a string of binary digits."
The Clash Between Faith and Reason in the Modern World - Sam Harris gives a speech on the rational thinking and logics behind the idea of no god at the Aspen Ideas Festival.