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

JavaScript, CSS, HTML, HTML5, MySQL, WordPress, PHP and Python are the most in-demand tech skills from employers in 2020, according to a Upwork report.

[Click on image for larger view.] Native vs. Hybrid vs. Web Comparison (source: Upwork). One reason for that is that, by working with a single codebase consisting of JavaScript, HTML and CSS, ...

WebStorm, Visual Studio 2017, Visual Studio Code, NetBeans, Komodo, and Eclipse pull out the stops for JavaScript, Node.js, and friends.

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.