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This book will introduce you to the features of JavaScript, the main programming language of the World Wide Web that allows you to define advanced behaviour on web pages. You'll gain a deep understanding of how this wonderful language works, forget about dry, boring, static pages that just take up space on the screen, learn how to interact with users, respond to events, retrieve and use data from the web, display graphics, and much more. All this will allow you to move from the basics to the most interesting concepts of modern computer programming and expert-level problem solving. As always with Head First books, the material is presented in an interesting, entertaining, and highly informative way. This is a truly serious textbook, yet it is easy and enjoyable to read and learn.