stylus/README.md

Stylus is a fork of Stylish for Chrome, also compatible with Firefox as a WebExtension

## 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.

## Releases

1. [Chrome Web Store](https://chrome.google.com/webstore/detail/stylus/clngdbkpkpeebahjckkjfobafhncgmne) (or [beta](https://chrome.google.com/webstore/detail/stylus-beta/apmmpaebfobifelkijhaljbmpcgbjbdo))
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(see [wiki](https://github.com/openstyles/stylus/wiki/Opera,-Outdated-Stylus) for more recent version)

## Screenshots

![Style manager](https://user-images.githubusercontent.com/1310400/34453460-214eaa5c-ed67-11e7-843b-d8960b71db6e.png)
![Style editor](https://user-images.githubusercontent.com/1310400/34459585-3932cd94-ee05-11e7-9a1b-679522dddfb3.png)
![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)

## Help

- [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]

[chat-image]: https://img.shields.io/discord/379521691774353408.svg
[chat-link]: https://discordapp.com/widget?id=379521691774353408

## Contributing

The source is hosted on [GitHub](https://github.com/openstyles/stylus) and pull requests are welcome.

You can help us translate the extension on [Transifex](https://www.transifex.com/github-7/Stylus). When `messages.json` file is ready to be merged, please open a new bug report in [stylus/issues](https://github.com/openstyles/stylus/issues).

See our [contributing](./.github/CONTRIBUTING.md) page for more details.

## License

Inherited code from the original [Stylish](https://github.com/stylish-userstyles/stylish/):<br>
Copyright &copy; 2005-2014 [Jason Barnabe](jason.barnabe@gmail.com)

Current Stylus:<br>
Copyright &copy; 2017-2018 [Stylus Team](https://github.com/openstyles/stylus/graphs/contributors)

**[GNU GPLv3](./LICENSE)**<br>
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
along with this program.  If not, see <https://www.gnu.org/licenses/>.

### External libraries

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.