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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Post-Processing CSS · Create React App</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="<p>This project setup minifies your CSS and adds vendor prefixes to it automatically through <a href="https://github.com/postcss/autoprefixer">Autoprefixer</a> so you don’t need to worry about it.</p>
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<p>Support for new CSS features like the <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/all"><code>all</code> property</a>, <a href="https://www.w3.org/TR/css-break-3/#breaking-controls"><code>break</code> properties</a>, <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/Using_CSS_variables">custom properties</a>, and <a href="https://www.w3.org/TR/mediaqueries-4/#range-context">media query ranges</a> are automatically polyfilled to add support for older browsers.</p>
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</span></div></article></div><div class="docLastUpdate"><em>Last updated on 12/23/2018 by Denis Mukhametov</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/create-react-app/docs/adding-a-sass-stylesheet"><span class="arrow-prev">← </span><span>Adding Sass Stylesheets</span></a><a class="docs-next button" href="/create-react-app/docs/adding-images-fonts-and-files"><span>Adding Images, Fonts, and Files</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/create-react-app/" class="nav-home"><img src="/create-react-app/img/logo.svg" alt="Create React App" width="66" height="58"/></a><div><h5>Docs</h5><a href="/create-react-app/docs/getting-started">Get Started</a><a href="https://reactjs.org/" target="_blank" rel="noreferrer noopener">Learn React</a></div><div><h5>Community</h5><a href="https://stackoverflow.com/questions/tagged/create-react-app" target="_blank" rel="noreferrer noopener">Stack Overflow</a><a href="https://spectrum.chat/react" target="_blank" rel="noreferrer noopener">Spectrum</a><a href="https://twitter.com/reactjs" target="_blank" rel="noreferrer noopener">Twitter</a></div><div><h5>More</h5><a href="https://www.github.com/facebook/create-react-app">GitHub</a><a class="github-button" href="https://github.com/facebook/create-react-app" data-icon="octicon-star" data-count-href="/facebook/create-react-app/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" rel="noreferrer noopener" class="fbOpenSource"><img src="/create-react-app/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2019 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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