It's extremely minimalistic, but powerful framework based on following key concepts: Just needed and nothing more, no legacy, no HTML markup. Core JS types extensions and new ones: URL, EntityContext. Highly customizable object-oriented property-driven Widget. True cross-browser: no forks, but minimal DOM usage best performance. UI Librarycomponents over DOM, absolute positioned layouts. AJAX-based server-side interaction. set of core UI components such as fields, buttons, combo etc.