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Preface

Preface

Learning Hypertext Markup Language (HTML) and Extensible Hypertext Markup Language (XHTML) is like learning any new language, computer or human. Most students first immerse themselves in examples. Studying others is a natural way to learn, making learning easy and fun. Our advice to anyone wanting to learn HTML and XHTML is to get out there on the World Wide Web with a suitable browser and see for yourself what looks good, what's effective, what works for you. Examine others' documents and ponder the possibilities. Mimicry is how many of the current webmasters have learned the language.

Imitation can take you only so far, though. Examples can be both good and bad. Learning by example will help you talk the talk, but not walk the walk. To become truly conversant, you must learn how to use the language appropriately in many different situations. You could learn all that by example, if you live long enough.

Remember, too, that computer-based languages are more explicit than human languages. You've got to get the language syntax correct or it won't work. Then, too, there is the problem of "standards." Committees of academics and industry experts define the proper syntax and usage of a computer language like HTML. The problem is that browser manufacturers like Netscape Communications Corporation (now an America Online company) and Microsoft Corporation choose the parts of the standard they will use and which parts they will ignore. They even make up their own parts, which may eventually become standards.

Standards change, too. As we write this current edition, HTML is undergoing a conversion into XHTML, making it an application of the Extensible Markup Language (XML). HTML and XHTML are so similar that we often refer to them as a single language. But there are key differences; more about this later in the preface.

To be safe, the way to become fluent in HTML and XHTML is through a comprehensive, up-to-date language reference that covers the language syntax, semantics, and variations in detail to help you distinguish between good and bad usage.

There's one more step leading to fluency in a language. To become a true master of the language, you need to develop your own style. That means knowing not only what is appropriate, but what is effective. Layout matters. A lot. So does the order of presentation within a document, between documents, and between document collections.

Our goal in writing this book is to help you become fluent in HTML and XHTML, fully versed in their syntax, semantics, and elements of style. We take the natural learning approach, using examples: good ones, of course. We cover every element of the currently accepted versions (HTML 4.01 and XHTML 1.0) of the languages in detail, as well as all of the current extensions supported by the popular browsers, explaining how each element works and how it interacts with all the other elements.

And, with all due respect to Strunk and White, throughout the book we will give you suggestions for style and composition to help you decide how best to use HTML and XHTML to accomplish a variety of tasks, from simple online documentation to complex marketing and sales presentations. We'll show you what works and what doesn't, what makes sense to those who view your pages, and what might be confusing.

In short, this book is a complete guide to creating documents using HTML and XHTML, starting with basic syntax and semantics, and finishing with broad style guidelines to help you create beautiful, informative, accessible documents that you'll be proud to deliver to your browsers.

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