Release Notes: The major focus was on maturing the platform core. The runtime module is now used in multiple projects and commercial products. New features include implementation of the good parts of the jQuery API, a core localization service, a plugin infrastructure, support for IE9 and FF4, an HTML5 canvas element for IE6-8, and a guarded API. The UI elements registration API was simplified. The component-in-component implementation was re-visited. Multiple fixes were made to the SVG implementation for IE6-8. The XUL implementation was enhanced.