Codepen provides an intuitive and collaborative platform for web developers to showcase, experiment, and learn through its vast collection of code snippets, live previews and community engagement, fostering creativity and growth.

It's VERY fast to get started.. just go to https://codepen.io/pen/ and start coding! The default 4x panel view is very convenient for adding your HTML, CSS and JavaScript and seeing the resulting webpage with changes updated in real-time.

CodePen helps you write code for a small functionality and share it with anyone. It supports many popular programming languages. The best thing about this is that it also provides code completion.