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44 lines
1.8 KiB
Markdown
44 lines
1.8 KiB
Markdown
---
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id: post-processing-css
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title: Post-Processing CSS
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---
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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.
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Support for new CSS features like the [`all` property](https://developer.mozilla.org/en-US/docs/Web/CSS/all), [`break` properties](https://www.w3.org/TR/css-break-3/#breaking-controls), [custom properties](https://developer.mozilla.org/en-US/docs/Web/CSS/Using_CSS_variables), and [media query ranges](https://www.w3.org/TR/mediaqueries-4/#range-context) are automatically polyfilled to add support for older browsers.
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You can customize your target support browsers by adjusting the `browserslist` key in `package.json` according to the [Browserslist specification](https://github.com/browserslist/browserslist#readme).
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For example, this:
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```css
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.App {
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display: flex;
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flex-direction: row;
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align-items: center;
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}
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```
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becomes this:
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```css
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.App {
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display: -webkit-box;
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display: -ms-flexbox;
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display: flex;
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-webkit-box-orient: horizontal;
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-webkit-box-direction: normal;
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-ms-flex-direction: row;
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flex-direction: row;
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-webkit-box-align: center;
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-ms-flex-align: center;
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align-items: center;
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}
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```
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If you need to disable autoprefixing for some reason, [follow this section](https://github.com/postcss/autoprefixer#disabling).
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[CSS Grid Layout](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Grid_Layout) prefixing is disabled by default, but it will **not** strip manual prefixing.
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If you'd like to opt-in to CSS Grid prefixing, [first familiarize yourself about its limitations](https://github.com/postcss/autoprefixer#does-autoprefixer-polyfill-grid-layout-for-ie).<br>
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To enable CSS Grid prefixing, add `/* autoprefixer grid: on */` to the top of your CSS file.
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