Supported Browsers & Features
By default, the generated project supports all modern browsers. Support for Internet Explorer 9, 10, and 11 requires polyfills. For a set of polyfills to support older browsers, use react-app-polyfill.
This project supports a superset of the latest JavaScript standard. In addition to ES6 syntax features, it also supports:
While we recommend using experimental proposals with some caution, Facebook heavily uses these features in the product code, so we intend to provide codemods if any of these proposals change in the future.
If you use any other ES6+ features that need runtime support (such as
Array.from() or Symbol), make sure you are including the appropriate polyfills manually, or that the browsers you are targeting already support them.This project also supports:
- CSS
Support for new CSS features like the
all property, break properties, custom properties, and media query ranges are automatically poly-filled to add support for older browsers.CSS Grid Layout prefixing is disabled by default, but it will not strip manual prefixing. If you'd like to opt-in to CSS Grid prefixing, first familiarize yourself about its limitations.
To enable CSS Grid prefixing, add
/* autoprefixer grid: autoplace */ to the top of your CSS file.By default, the generated project includes a
browserslist configuration in your package.json file to target a broad range of browsers based on global usage (> 0.2%) for production builds, and modern browsers for development. This gives a good development experience, especially when using language features such as async/await, but still provides high compatibility with many browsers in production.The
browserslist configuration controls the output JavaScript so that the emitted code is compatible with the browsers specified. The production list will be used when creating a production build by running the build script, and the development list will be used when running the start script. You can use https://browserl.ist to see the browsers supported by your configured browserslist.Here is an example
browserslist that is specified in package.json:"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
}
This project allows you to create extensions to its own build configuration. You can always add a missing feature to your project by following the build extension guide.