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Post Processing CSS

Introduction:​

Welcome to the enchanting world of post-processing CSS! In Create React App, your CSS is automatically minified and provided with vendor prefixes by the powerful Autoprefixer, saving you from the hassle. If you've ever wished to sprinkle a touch of magic onto your stylesheets, you've come to the right place. In this guide, we'll delve into the fascinating realm of post-processing CSS and explore how it can enhance your React applications.

Moreover, with the support of post-processing tools, you can embrace new CSS features and ensure compatibility with older browsers. Custom properties, media query ranges, and other cutting-edge features are automatically polyfilled to deliver a consistent experience.

Customizing Browser Support​

You have the flexibility to define your target browser support by adjusting the browserslist key in your package.json file. This allows you to cater to your specific audience while considering the Browserslist specification.

For example, you can specify support for modern browsers by updating your browserslist to:

"browserslist": [
  "last 2 Chrome versions",
  "last 2 Firefox versions",
  "last 2 Safari versions"
]

A Magical Transformation​

Let's witness the enchanting transformation of a CSS class using Autoprefixer:

/* Before */
.App {
  display: flex;
  flex-direction: row;
  align-items: center;
}
/* After */
.App {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
  -ms-flex-direction: row;
  flex-direction: row;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}

Isn't it magical? Autoprefixer gracefully adds the necessary vendor prefixes, ensuring the widest browser compatibility for your styles.

Fine-Tuning Autoprefixer​

If, for any reason, you need to disable Autoprefixer for specific CSS rules, you can follow this section to learn how.

By default, Autoprefixer doesn't add prefixes for CSS Grid Layout. However, manual prefixes will be preserved. If you'd like to opt-in to CSS Grid prefixing, make sure you understand its limitations by reading this documentation.

To enable CSS Grid prefixing, simply add the following comment at the top of your CSS file:

/* autoprefixer grid: autoplace */

Now, go forth and create captivating styles with the power of post-processing CSS in Create React App!

For Example​

Step-by-step example demonstrating the post-processing CSS capabilities in Create React App:

1. Create a new React application using Create React App by running the following command in your terminal:

npx create-react-app my-app

2. Navigate into the project directory:

cd my-app

3. Open the src/App.css file in your preferred code editor.

4. Replace the existing CSS code with the following:

.App {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
}

5. Save the file and start the development server:

npm start

6. Open your browser and visit http://localhost:3000 to see the React application running.

http://localhost:3000

Welcome to My Magical App

Enjoy the wonders of post-processing CSS!

1. Now, let's witness the magic of post-processing CSS. Open the browser's developer tools and inspect the .App element.

2. In the Styles tab, you'll notice that the CSS properties have been automatically prefixed by the browser. For example, the display: grid property is transformed into:

display: -ms-grid;
display: grid;

This transformation is performed by Autoprefixer, one of the post-processing tools integrated with Create React App. It ensures that your styles are compatible with various browsers.

9. Stop the development server by pressing Ctrl + C in the terminal.

Congratulations! You have successfully experienced the post-processing CSS in Create React App. In this example, Autoprefixer automatically added the necessary prefixes to the CSS property display: grid, ensuring cross-browser compatibility.

Feel free to explore more CSS features and observe how Autoprefixer and other post-processing tools enhance your styles in Create React App.

Live Coding​

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