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We're all for progressive enhancement, but CodePen is a bit unique in that it's all about writing and showing front end code, including JavaScript. It's required to use most of the features of CodePen.

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 …

The best place to build, demo, and discover front-end code. - CodePen

Write code in your browser. CodePen is a powerful online editor for HTML, CSS, and JavaScript, where you can build, test, and discover front-end projects.

Hello 👋 CodePen is the best place to build, test, and discover front-end code. CodePen is a social development environment for front-end designers and developers. Build and deploy a website, show …

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People use CodePen for all sorts of things: prototyping new ideas, reduced test cases for bugs, sending clients things to look at, evaluating potential hires, to finding inspiration. People also use CodePen as …

The Big Idea You write code in the editors, the results of that code are shown to you in the preview area. It’s simple, but powerful! Beginners and experts alike work best when they can see the results of …