PostCSS

PostCSS Preset Env lets you convert modern CSS into something most browsers can understand, determining the polyfills you need based on your targeted browsers or runtime environments, using cssdb. source

PostCSS is a tool to transform your CSS codes with JavaScript.

To use PostCSS, add the extensions to your web build tool. The best way to use PostCSS is to simply add its loader to your webpack.config.js.

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