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.

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 ...