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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="This project setup minifies your CSS and adds vendor prefixes to it automatically through [Autoprefixer](https://github.com/postcss/autoprefixer) so you don’t need to worry about it."/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Post-Processing CSS · Create React App"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/create-react-app/index.html"/><meta property="og:description" content="This project setup minifies your CSS and adds vendor prefixes to it automatically through [Autoprefixer](https://github.com/postcss/autoprefixer) so you don’t need to worry about it."/><meta property="og:image" 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</script></nav></div><div class="container mainContainer docMainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><h1 class="postHeaderTitle">Post-Processing CSS</h1></header><article><div><span><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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<p>You can customize your target support browsers by adjusting the <code>browserslist</code> key in <code>package.json</code> according to the <a href="https://github.com/browserslist/browserslist#readme">Browserslist specification</a>.</p>
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<p>For example, this:</p>
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<pre><code class="hljs css language-css"><span class="hljs-selector-class">.App</span> {
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<span class="hljs-attribute">display</span>: flex;
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<p>becomes this:</p>
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<span class="hljs-attribute">flex-direction</span>: row;
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}
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<p>If you need to disable autoprefixing for some reason, <a href="https://github.com/postcss/autoprefixer#disabling">follow this section</a>.</p>
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<p><a href="https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Grid_Layout">CSS Grid Layout</a> prefixing is disabled by default, but it will <strong>not</strong> strip manual prefixing.
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If you'd like to opt-in to CSS Grid prefixing, <a href="https://github.com/postcss/autoprefixer#does-autoprefixer-polyfill-grid-layout-for-ie">first familiarize yourself about its limitations</a>.<br>
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To enable CSS Grid prefixing, add <code>/* autoprefixer grid: on */</code> to the top of your CSS file.</p>
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