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dabbler.org is collaborative learning-to-program site for HTML, Javascript, jQuery, Turtle graphics, and CoffeeScript. Check out the latest, feature-rich version on pencilcode.net . 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 .html etc. There is also another old version at js.dabbler.org .
You can edit any page by changing the "/home/" in the URL to "/edit/". For example the file you are reading can be edited here . To make a new file, visit the URL that you would like to use. If the file does not yet exist, you will be given a link to create it.