...It provides a well-designed, object-oriented API for creating interactive graphics applications.
It integrates SVG/VML, provides several graphic objects (line, circle, ellipse, rectangle, polyline, polygon, raster image, Bezier curve), supports mouse events and offers many utilities.
It is designed for, and well tested on most major web browsers (MSIE 6+, Firefox 3+, Opera 9+, Safari 3+, Chrome).