MDN Web Docs is an excellent example of a Free and Open-Source (FOSS) platform. You can access HTML, CSS, and JavaScript documentation and examples on a well-organized website. Among the tools the ...

General Assembly has launched a new online service that teaches basic web development for free, in your browser. It's called Dash, and it lets users learn how to use HTML, Javascript, and CSS by ...

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.