CHAPTER 2 HTML Primer We are going to spend a lot of time in this book working on HTML documents. In this chapter, I set out the information you'll need to understand what we are doing later in the book. This isn't an HTML tutorial but rather a summary of the key characteristics of HTML that I'll rely on in later chapters. The latest version of HTML, which is known as HTML5, is a topic in its own right. HTML5 has more than 100 elements, and each of them has its own purpose and functionality. That said, you need only a basic knowledge of HTML to understand how jQuery works, but if you want to learn about the details of HTML, then I suggest another of my books: The Definitive Guide to HTML5, also published by Apress.