MooTools Canvas is a byproduct of Google's Excanvas and a script by Ralph Sommerer. In retrospect, I can't tell where one ends and one begins. Moreover, there hasn't been a single line of code that I haven't personally modified for performance, file-size reduction, or programming-style maintenance.

Thanks to MooTools, the new Canvas class is: small, modular, and lightweight.

var cv = new Canvas();
var ctx = cv.getContext('2d');
$(document.body).adopt(cv);

*More information on the site