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Codepen is a browser-based HTML, CSS and JavaScript editor that provides instant feedback on programmed ones. Codepen is also defined as a developer playground, community hub, and forum. The Codepen API can be used for automatic branching, as well as accessing saved HTML, CSS, and JavaScript files stored on HTTPS endpoints. To fill the pins with different values, developers can send POST requests to the Codepen endpoint with data formatted as JSON. This editor pre-fill feature allows the user to programmatically update project titles, library dependencies, CSS colors used, HTML rendering, and more.
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