Sure, HTML and CSS are the foundations of web development, offering the basic structure and formatting that make web pages and apps what they are today. But without the pre-eminent programming ...

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.

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