The Makefile, package.json, scripts, styleguide-template, and mediawiki.ui/styleguide.md files and directories here and in resources/src/mediawiki.ui/ support the automatic generation of CSS documentation from the source LESS files using kss for node.js, https://github.com/kneath/kss To build and open in your web browser, run: MEDIAWIKI_LOAD_URL=mediawiki_hostname/w/load.php make kssopen For example, MEDIAWIKI_LOAD_URL=1.2.3.4/w/load.php make kssopen If MediaWiki is running on localhost, you can omit MEDIAWIKI_LOAD_URL. To rebuild without opening the web browser, run: MEDIAWIKI_LOAD_URL=mediawiki_hostname/w/load.php make When modifying styleGuideModules.txt, keep the list in strict alphabetical order (with no extra formatting), so CSS loads in the same order as ResourceLoader's addModuleStyles does; this can affect rendering.