Web-based technologies including HTML ... JavaScript is an excellent programming language to learn. Web developers who can control the web browser with advanced JavaScript routines are in high demand.

jsFiddle is the perfect solution; it provides a custom environment (based on user selections) to test (or fiddle with) your JavaScript, HTML, and CSS code right inside your browser. A quick tour ...

The new release brings improvements to JavaScript heap profiles, CSS code formatting ... the semantic highlighting of JavaScript source in HTML files with what is seen in normal .jscode files.