JSGL is an Open-Source, browser independent 2D vector graphics 
library for JavaScript.

It is designed for, and well tested on most major web browsers:
Internet Explorer 6.0+,
Firefox 3.0+,
Opera 9.0+,
Safari 3.0+,
Google Chrome

It provides a well-designed, object-oriented API for creating 
interactive graphics applications in JavaScript. In integrates 
VML/SVG vector markup languages. However, the API provided is 
cross-browser, leaving all the hard work to JSGL.