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# [postcss][postcss]-unique-selectors
> Ensure CSS selectors are unique.
## Install
With [npm](https://npmjs.org/package/postcss-unique-selectors) do:
```
npm install postcss-unique-selectors --save
```
## Example
Selectors are sorted naturally, and deduplicated:
### Input
```css
h1,h3,h2,h1 {
color: red
}
```
### Output
```css
h1,h2,h3 {
color: red
}
```
## Usage
See the [PostCSS documentation](https://github.com/postcss/postcss#usage) for
examples for your environment.
## Contributors
See [CONTRIBUTORS.md](https://github.com/cssnano/cssnano/blob/master/CONTRIBUTORS.md).
## License
MIT © [Ben Briggs](http://beneb.info)
[postcss]: https://github.com/postcss/postcss