CodePen

CodePen provides an online environment for experimenting with front-end web code. Visitors can create or explore examples using HTML, CSS and JavaScript and share demonstrations with others. The website is useful for testing small ideas and learning techniques. Reuse of another person's work depends on the example's licence and the relevant project requirements.

It is useful for investigating a particular design or software-development task. Its focus includes Online front-end experiments, HTML CSS and JavaScript demos and Code sharing and discovery, helping a visitor identify the relevant product, technical resource or asset and relate it to the work being undertaken.