A project editor supports multiple HTML, CSS, and JavaScript files. With the free account, you can only have one project and 10 files . If you are interested in creating more projects, you will need to upgrade to the Pro account.
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CodePen is a social development environment. At its heart, it allows you to write code in the browser, and see the results of it as you build. A useful and liberating online code editor for developers of any skill, and particularly empowering for people learning to code .
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