This is the official guide to building native JavaScript applications for Palm's new mobile operating system, Palm[registered] webOSA. Written by Palm's software chief technology officer along with the Palm webOS development team, "Palm webOS" provides a complete tutorial on the design principles, architecture, UI, tools, and services necessary to develop webOS applications - including the Mojo JavaScript framework and Palm's SDK. "Palm webOS" is designed to support a fast and superb user experience using established web standards, so if you're familiar with HTML, CSS, and JavaScript, you're ready to build applications for any webOS-based device, including the Palm Pre. You'll gain expertise, chapter by chapter, as you build a working mobile application through the course of the book. You'll also learn how to extend existing web apps to work with the new generation of mobile phones. Get a thorough overview of the webOS platform and architecture. Understand the critical concepts for application design: what separates webOS from other web and mobile platforms. Learn the details of Mojo's development tools and SDK for building and testing mobile applications. Examine best practices, important considerations, and guiding principles for developing with webOS and the Mojo framework.