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# [postcss][postcss]-discard-duplicates [][ci] [][npm] [][deps]
> Discard duplicate rules in your CSS files with PostCSS.
## Install
With [npm](https://npmjs.org/package/postcss-discard-duplicates) do:
```
npm install postcss-discard-duplicates --save
```
## Example
This module will remove all duplicate rules from your stylesheets. It works on
at rules, normal rules and declarations. Note that this module does not have any
responsibility for normalising declarations, selectors or whitespace, so that it
considers these two rules to be different:
```css
h1, h2 {
color: blue;
}
h2, h1 {
color: blue;
}
```
It has to assume that your rules have already been transformed by another
processor, otherwise it would be responsible for too many things.
### Input
```css
h1 {
margin: 0 auto;
margin: 0 auto
}
h1 {
margin: 0 auto
}
```
### Output
```css
h1 {
margin: 0 auto
}
```
## Usage
See the [PostCSS documentation](https://github.com/postcss/postcss#usage) for
examples for your environment.
## Contributors
Thanks goes to these wonderful people ([emoji key](https://github.com/kentcdodds/all-contributors#emoji-key)):
<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
| [<img src="https://avatars.githubusercontent.com/u/1282980?v=3" width="100px;"/><br /><sub>Ben Briggs</sub>](http://beneb.info)<br />[💻](https://github.com/ben-eb/postcss-discard-duplicates/commits?author=ben-eb) [📖](https://github.com/ben-eb/postcss-discard-duplicates/commits?author=ben-eb) 👀 [⚠️](https://github.com/ben-eb/postcss-discard-duplicates/commits?author=ben-eb) | [<img src="https://avatars.githubusercontent.com/u/5635476?v=3" width="100px;"/><br /><sub>Bogdan Chadkin</sub>](https://github.com/TrySound)<br />[💻](https://github.com/ben-eb/postcss-discard-duplicates/commits?author=TrySound) 👀 [⚠️](https://github.com/ben-eb/postcss-discard-duplicates/commits?author=TrySound) | [<img src="https://avatars.githubusercontent.com/u/68302?v=3" width="100px;"/><br /><sub>Lee Houghton</sub>](https://github.com/asztal)<br />[💻](https://github.com/ben-eb/postcss-discard-duplicates/commits?author=asztal) | [<img src="https://avatars.githubusercontent.com/u/1737375?v=3" width="100px;"/><br /><sub>Andy Jansson</sub>](https://github.com/andyjansson)<br />[💻](https://github.com/ben-eb/postcss-discard-duplicates/commits?author=andyjansson) [⚠️](https://github.com/ben-eb/postcss-discard-duplicates/commits?author=andyjansson) |
| :---: | :---: | :---: | :---: |
<!-- ALL-CONTRIBUTORS-LIST:END -->
This project follows the [all-contributors] specification. Contributions of
any kind welcome!
## License
MIT © [Ben Briggs](http://beneb.info)
[all-contributors]: https://github.com/kentcdodds/all-contributors
[ci]: https://travis-ci.org/ben-eb/postcss-discard-duplicates
[deps]: https://gemnasium.com/ben-eb/postcss-discard-duplicates
[npm]: http://badge.fury.io/js/postcss-discard-duplicates
[postcss]: https://github.com/postcss/postcss