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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
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