I didn't know that Processing.js is independent project with independent wep page. I was never interested because I'm not interested in web technologies at all. I'm using procesing more or less for rapid prototyping of games an educative physical demonstrations / simulations and for my personal learning and reaseach of numerical mathematics and GLSL shaders, because it is faaaaaaar easier to configure than other enviroments and it has very usefull interactive visualization and interactive features for debuging, and it is almost as fast as Fortran or C.