Don't forget to also read <a href="http://pomax.github.io/bezierinfo/" rel="nofollow">http://pomax.github.io/bezierinfo/</a>
I'm looking for a javascript library that can do operations on bezier curves. For instance: path intersection, path union, path grow/shrink, path rounding, applying calligraphic pens to paths, etc. (basically all the operations found in vector graphics tools).