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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Seems https://play.tailwindcss.com/ is the best balance, but it doesn't allow split window to see both CSS and HTML at the same time.
Or if you want something closer to a local dev environment, https://stackblitz.com/ . You'd need to set things up yourself, but gives you the freedom to play around without installing on your local machine.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.