Back in 2012, Mozilla launched Thimble, an online code editor for teaching the basics of HTML, CSS and JavaScript. Over time, though, things got pretty quiet around the project as other browser ...

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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.

In both cases, the browser loads the CSS, parses it, then applies the styles to the markup. CSS-in-JS offers a third approach: delivering CSS by programmatically generating it in code.

We’ll look at three Python web frameworks that follow this paradigm, allowing you to describe front-end code (HTML, CSS, and JavaScript) using back-end Python code. The front-end objects are ...