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# Stylus
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Stylus is a fork of Stylish for Chrome, also compatible with Firefox as a WebExtension
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## Highlights
* In addition to the userstyles.org site, styles with customizable parameters can also be installed from .user.css or .user.styl URLs (see [Usercss format wiki ](https://github.com/openstyles/stylus/wiki/Usercss )).
* Site styles can be discovered and previewed in the popup using inline search with screenshot thumbnails.
* A backup feature which is compatible with other userstyles managers.
* Configurable automatic update function for installed styles.
* Customizable UI, optional layouts, and tweaks.
* Two different optional code validators with user-configurable rules: CSSLint and Stylelint.
* Both validators use Web Worker API to run in a separate background thread inside the editor tab without blocking your interaction with the code.
* CSSLint is heavily modified compared to the effectively frozen original one and supports various CSS3 features as well as CSS4 Color and CSS Grid syntax.
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## Releases
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1. [Chrome Web Store ](https://chrome.google.com/webstore/detail/stylus/clngdbkpkpeebahjckkjfobafhncgmne ) (or [beta ](https://chrome.google.com/webstore/detail/stylus-beta/apmmpaebfobifelkijhaljbmpcgbjbdo ))
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2. [Firefox add-ons ](https://addons.mozilla.org/firefox/addon/styl-us/ )
3. [Opera add-ons ](https://addons.opera.com/extensions/details/stylus/ ) (see [wiki ](https://github.com/openstyles/stylus/wiki/Opera,-Outdated-Stylus ) for more recent version)
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## Screenshots
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![Style manager ](https://user-images.githubusercontent.com/1310400/34453460-214eaa5c-ed67-11e7-843b-d8960b71db6e.png )
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![Style editor ](https://user-images.githubusercontent.com/1310400/34459585-3932cd94-ee05-11e7-9a1b-679522dddfb3.png )
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![Popup config for usercss ](https://user-images.githubusercontent.com/1310400/34453462-218a589a-ed67-11e7-9040-7d0469eeadc3.png )
![Popup inline search ](https://user-images.githubusercontent.com/1310400/34453463-21a44368-ed67-11e7-93b2-e1c8f5aac868.png )
![Style manager config for usercss ](https://user-images.githubusercontent.com/1310400/34453464-21bdaf9c-ed67-11e7-8517-62d2f02e1918.png )
![Options ](https://user-images.githubusercontent.com/1310400/34453461-216aee4c-ed67-11e7-92db-ea21c1da5826.png )
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## Help
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* [Stylus help and FAQ in our Wiki ](https://github.com/openstyles/stylus/wiki )
* [Discussion section ](https://add0n.com/stylus.html#reviews ) of our representation on add0n.com
* Discord: [![Discord][chat-image]][chat-link]
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[chat-image]: https://img.shields.io/discord/379521691774353408.svg
[chat-link]: https://discordapp.com/widget?id=379521691774353408
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## Contributing
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The source is hosted on [GitHub ](https://github.com/openstyles/stylus ) and pull requests are welcome.
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You can help us translate the extension on [Transifex ](https://www.transifex.com/github-7/Stylus ).
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See our [contributing ](./.github/CONTRIBUTING.md ) page for more details.
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## License
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Inherited code from the original [Stylish ](https://github.com/stylish-userstyles/stylish/ ):
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Copyright © 2005-2014 [Jason Barnabe ](jason.barnabe@gmail.com )
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Current Stylus:
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Copyright © 2017-2019 [Stylus Team ](https://github.com/openstyles/stylus/graphs/contributors )
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**[GNU GPLv3](./LICENSE)**
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This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
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along with this program. If not, see < https: / / www . gnu . org / licenses / > .
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### External libraries
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The licenses of [external libraries ](./vendor ) used in this project or [modified versions of external libraries ](./vendor-overwrites ) can be found in their respective directory.