A living style guide offers improved documentation of the visual appearance and behavior of a site.
MediaWiki's style guide can be found at https://design.wikimedia.org/style-guide/
Its source code is located in wikimedia/WikimediaUI-StyleGuide at GitHub.
OOUI library live demos
- Tasks and bug reports in Wikimedia Phabricator
- Historical discussions to move to one single Design style guide: task T151117