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HTML5 is a “versionless” standard. The specifications behind HTML5 continue to grow and evolve, but this evolution is not matched with “official” or versioned releases.

As such, this book does not focus on a specific version of HTML5; instead, it focuses on the aspects of HTML5 that have achieved widespread adoption in all of the most common web browsers.

The JavaScript language does contain versioned releases, but unlike most programming languages, you have no control over the version that your users will choose because this is a byproduct of the browser that they select. As a result, this book will not focus on a specific version of JavaScript: It will focus on the features that are universally available in all the major browsers.

This book will use a number of JavaScript libraries that are subject to change over time. Whenever a library is used, a specific version will be specified. In many cases, a more recent version of the library will work without issue, although the code is only guaranteed to work with the specified version.

This book is intended as a hands-on guide. Each lesson includes code and exercises that you can follow along with, and even augment if you choose. It is important that you follow along with these exercises because it is this process that will consolidate your understanding of how the technologies really work.