jsFiddle lets developers play with the three core elements of Web development. Check out this powerful application for rapid prototyping and testing.

It’s not quite recursion, because there’s no way to dynamically generate HTML with CSS. However, with just a few tags, [Jim] can generate one level of a Pythagoras Tree.

To show off what EdgeHTML can do, Microsoft has built a browser using predominantly JavaScript, HTML, and CSS. Next, the company released the app on the Windows Store and the sample code on GitHub.