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Build, share, and learn JavaScript, CSS, and HTML with our online code editor. CodePen doesn't work very well without JavaScript. 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.
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In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.
We offer four different HTML preprocessors that you can use while creating and editing Pens on CodePen: Markdown, Haml, Slim, and Pug. These can be useful in writing more terse code. Or, perhaps you are working on projects in these languages and want to keep your examples consistent.
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Interested in CodePen? Just getting started? Want to level up? In this video we'll show you how to use CodePen (https://codepen.io/) to quickly create projec...
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These CodePens show off some seriously awesome visual effects. Brandon Morelli. ·. Follow. Published in. codeburst. ·. 1 min read. ·.