Note that HTML 3.0 has more features than HTML 3.2. Netscape and Microsoft invented their own extensions. Some of these extensions are incorporated in HTML 3.2. In principle, new versions of HTML are designed in such a way that old browsers are able to handle pages marked up with the new language and present its content in a readable way. This principle is called graceful degradation .
Graceful degradation requires effort from the part of the author - and skill.
Teaches a generic version of HTML, which should work on any browser. The guide teaches HTML 2.0 plus some widely implemented additional features. Don't forget to print out the pdf version . This guide emphasizes the structural features of HTML and illustrates them with examples. In addition it gives stylistic recommendations, references to existing descriptions of HTML, and an alphabetical list of all HTML tags.