Netlify has introduced the Netlify Playground, a single-page application that allows users to test configuration rules for their sites, including redirect rules, with confidence. The playground was built using Elm, a statically typed language that integrates well with other frontend tools and Webpack, making it easy to deploy on Netlify. The platform is open-sourced, allowing developers to contribute and provide feedback on GitHub. With the Netlify Playground, users can validate their configuration rules before deploying to production, ensuring a smoother deployment process.