By default, every time you save your project runs and automatically updates the preview. You can save and run your project by clicking the “Save All + Run” button in the header . You can also use the keyboard shortcut to save your current file (Command + S for Mac, CTRL + S for PC).
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CodePen is an online community for testing and showcasing user-created HTML, CSS and JavaScript code snippets . It functions as an online code editor and open-source learning environment, where developers can create code snippets, called “pens,” and test them.
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