CodePen

CodePen is an online community for testing and showcasing user-created HTML, CSS, and JavaScript code snippets. It functions as a social development environment, allowing front-end developers and designers to write code in a browser-based editor and see instant visual results.

The platform is used for experimenting with web technologies, sharing work, and collaborating on projects. It caters to web developers, designers, and anyone learning front-end development who wants to practice coding, get feedback, or explore creative coding examples.