org is collaborative learning-to-program site for HTML, Javascript, jQuery, Turtle graphics, and CoffeeScript. Check out the latest, feature-rich version on pencilcode. You can put arbitrary HTML pages and other content on Pencil Code just like you can on dabbler - just rename your files to end in . There is also another old version at js. For example the file you are reading can be edited here.

Pencil Code is a collaborative programming site for drawing art, playing music, and creating games. It is also a place to experiment with mathematical functions, geometry, graphing, webpages, simulations, and algorithms. Programs are open for all to see and copy. Or watch a video tutorial. The main language is Coffeescript. Professional software engineers use Coffeescript to build complex websites, but Coffeescript code can also be very simple. Or check out the quick reference.