I prefer PixiJS (http://www.pixijs.com http://www.pixijs.com), it comes with a ton of primitives and renders efficiently even on mobile. I've created layered d

I prefer PixiJS (http://www.pixijs.com http://www.pixijs.com), it comes with a ton of primitives and renders efficiently even on mobile. I've created layered drag-and-drop webapps with Pixi, draw & erase would not be much different.