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

Unlike the previous beginner course, this one covers HTML5, CSS3, the Twitter Bootstrap CSS Framework and JavaScript, which the instructor describes as the programming language for the web.

HTML, CSS and other web technologies are also great ways to teach developers important, meaningful lessons about how to write code — lessons that programmers can apply to any popular programming ...