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

Also in Visual Studio Code 1.66, the built-in CSS extension now ships with a code formatter, implemented by the js-beautify library, that works with CSS, LESS, and CSS.

Q&A Hybrid Web Frameworks Q&A with Allen Conway: Reach Android/iOS with JavaScript, HTML and CSS Learn how offerings like Ionic, Cordova and others provide an alternative to straight web-dev, ...