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It takes browser support data from CSSDB, which draws on Can I Use and MDN, and applies only the transformations that a project's browser targets need. It also includes Autoprefixer and shares the same browser list with it.\n\nIt is installed from npm and added to the plugin list of a PostCSS build. It runs in all Node environments, and its [README](https://github.com/csstools/postcss-plugins/blob/main/plugin-packs/postcss-preset-env/README.md) is the documentation.\n\n## Worth knowing\n\nSome features need a companion library in the browser. The README says this is because not every behavior can be polyfilled with CSS alone."}