To help answer questions that members have already asked (and such good questions, thanks!), as well as to anticipate some, I'm posting some important quotes from various pieces of the "front matter". I hope this helps people understand what the book is all about.
You should also have a working knowledge of HTML and CSS. Again, nothing too advanced, but you should know the basics of putting a web page together.
From the preface by John Resig
Even though this book has been under development for a long time, thankfully it is not out of date. The book has been given a solid set of revisions by my coauthor Bear Bibeault. He’s gone through and made sure that the material will continue to be relevant for a long time to come.
This book is organized to take you from an apprentice to a ninja in four parts.
Part 1 introduces the topic, and introduces some tools we’ll need as we progress
through the rest of the book.
In part 3, we dive into using the fundamentals that we learned in part 2 to solve knotty problems that the browsers throw at us.
Some particularly important passages: