* 100% JavaScript UI Framework * Open web technologies + jQuery API * Better build-/run-time performance * SVG in Internet Explorer 5.5-8.0 * Cross-browser XUL (desktop-like UI) * Extensible SDK architecture * Custom Web Components

* Rich text features - multiline texts, text measurement, including width, height, as well as wrap, overflow, indent, spacing, align, etc. * Powerful line drawing - far beyond just Bézier curves (any curves, arcs, and other deformations). * Virtual DOM - for drawing rapidly and only what is necessary. * Smart layering system (including z-index). * Transformation engine - no need to use embarrassing in-browser transformations. * Support of legacy browsers (IE6+). * Clear and concise JavaScript API with chaining support.