http://ibulla.com/process/

https://processing.org/reference/

http://processingjs.org/articles/p5QuickStart.html

<script src="processing-1.0.0.min.js"></script>
<canvas data-processing-sources="hello-web.pde"></canvas>

If you want to experiment with web-based Processing.js code editors, you can also try these:

• http://sketch.processing.org/
• http://sketchpad.cc/
• http://hascanvas.com/