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# Change target browsers for Autoprefixer
Currently, the CLI uses [Autoprefixer](https://github.com/postcss/autoprefixer) to ensure compatibility
with different browser and browser versions. You may find it necessary to target specific browsers
or exclude certain browser versions from your build.
Internally, Autoprefixer relies on a library called [Browserslist](https://github.com/browserslist/browserslist)
to figure out which browsers to support with prefixing.
There are a few ways to tell Autoprefixer what browsers to target:
### Add a browserslist property to the `package.json` file
```
"browserslist": [
"> 1%",
"last 2 versions"
]
```
### Add a new file to the project directory called `.browserslistrc`
```
### Supported Browsers
> 1%
last 2 versions
```
Autoprefixer will look for the configuration file/property to use when it prefixes your css.
Check out the [browserslist repo](https://github.com/browserslist/browserslist) for more examples of how to target
specific browsers and versions.
_Side note:_
Those who are seeking to produce a [progressive web app](https://developers.google.com/web/progressive-web-apps/) and are using [Lighthouse](https://developers.google.com/web/tools/lighthouse/) to grade the project will
need to add the following browserslist config to their package.json file to eliminate the [old flexbox](https://developers.google.com/web/tools/lighthouse/audits/old-flexbox) prefixes:
`package.json` config:
```
"browserslist": [
"last 2 versions",
"not ie <= 10",
"not ie_mob <= 10"
]
```