JSFiddle - Code Playground. Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.
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An online code editor, learning environment, and community for front-end web development using HTML, CSS and JavaScript code snippets, projects, and web applications.
JS Bin. Sample of the bin:
dabblet.com. An interactive CSS playground and code sharing tool. Dabblet saves to Github gists and offers many conveniences for CSS editing.
Discover gists. GitHub Gist: instantly share code, notes, and snippets.
Thimble. Mozilla is a global nonprofit dedicated to keeping the Internet a global public resource that is open and accessible to all.
PHP Sandbox is an online code sandbox for PHP that makes prototyping and sharing of PHP projects swift and painless!
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The most fun place to experiment with layouts using variable fonts, and export front-end code right from this little web app. Designed and developed by Wenting Zhang.
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A website for writing and running scripts in the browser, including versioning, an API, scheduling and more.