The book is a programmer's guide and comprehensive reference to the core JavaScript language and to the client-side JavaScript APIs defined by web browsers.

The sixth edition covers HTML 5 and ECMAScript 5. Many chapters have been completely rewritten to bring them in line with today's best web development practices. New chapters in this edition document jQuery and server-side JavaScript.

Recommended for experienced programmers who want to learn the programming language of the Web, and for current JavaScript programmers who want to master it.