JavaScript is the ubiquitous programming language of the Web, and for more than 15 years, JavaScript: The Definitive Guide has been the bible of JavaScript programmers around the world. Ideal for JavaScript developers at any level, this book is an all-new excerpt of The Definitive Guide , collecting the essential parts of that hefty volume into this slim yet dense pocket reference. The first 9 chapters document the latest version (ECMAScript 5) of the core JavaScript language, covering: Types, values, and variables Operators, expressions, and statements Objects and arrays Functions and classes The next 5 chapters document the fundamental APIs for using JavaScript with HTML5 and explain how to: Interact with web browser windows Script HTML documents and document elements Modify and apply CSS styles and classes Respond to user input events Communicate with web servers Store data locally on the user's computer This book is a perfect companion to jQuery Pocket Reference .