This document discusses how to build rich mobile user experiences using web standards like HTML5, CSS3, and JavaScript. It covers various HTML5 features such as new elements, forms, video/audio, geolocation and caching. It also discusses CSS techniques including transforms, transitions, animations and vendor-specific properties. Challenges with fixed positioning, touch events and performance are addressed. The document promotes building web apps that are native-like using frameworks like jQTouch and Sencha Touch.