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Read moreCan I use Emmet in Codepen?
CodePen supports Emmet. In HTML, try typing header. main-header>nav>ul.
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Alex does JavaScript development for CodePen, both front end and back, as well as Rails and just about everything else. @alexquez on Twitter and @quezo on CodePen.
Read moreIs CodePen a good IDE?
Pros: CodePen is an excellent web-based IDE for web and front-end development . The site supports HTML, CSS, JavaScript and more. One of the best features is the challenges. Every month the community completes themed challenges to hone the skills.
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