CodePen is an online community for testing and showcasing user-created HTML, CSS and JavaScript code snippets.

It functions as an online code editor and open-source learning environment, where developers can create code snippets, called "pens," and test them.

It was founded in 2012 by full-stack developers Alex Vazquez and Tim Sabat and front-end designer Chris Coyier.

[1][2][non-primary source needed] Its employees work remotely, rarely all meeting together in person.

CodePen is a large community for web designers and developers to showcase their coding skills,[3] with an estimated 330,000[4][unreliable source?]