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

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.

If you want to learn to create relatively simple online games using Javascript, then the HTML5 Game From Scratch Step By Step Learning JavaScript course is a great place to start.

It is similar to an old Galaga style game with the following features. The objective is to learn using JavaScript programming through making Space Shooter Game.