Fast experimentation
The Play CDN lets you try Tailwind directly in an HTML page without installing a build tool. It is excellent for learning, prototypes and small experiments.
Do not confuse it with production setup
The official documentation describes Play CDN as a development-oriented option. For a production application, use a proper build integration so your generated CSS is controlled by the project's build process.
When it is useful
Use Play CDN when you want to test a utility, experiment with responsive layouts, or teach Tailwind without first introducing Node.js tooling.