Arch Linux

MediaWiki has support for custom userscripts and user-stylesheets, see the $wgAllowUserJs [1] and $wgAllowUserCss [2] options.

Enabling userscripts would allow us to use many existing scripts from Wikipedia [3] which can greatly improve the experience of reading, editing and maintaining the wiki. It would also allow making ArchWiki-specific scripts like Wiki Monkey [4] more portable (currently it depends on browser extensions like Greasemonkey to work).

Enabling user-stylesheets lets the users customize the default Arch skin on the wiki according to their preference, and more importantly, it makes it easier for users to test changes to the skin for submitting upstream (i.e. [5]). Latest example where such user contributions are highly desirable is  FS#46697 .

I'm not aware of any drawbacks that these options would bring, since the default behaviour is the same, but interested users can gain something. Both options are enabled on Wikipedia, so the feature is well tested and secure.

[1] https://www.mediawiki.org/wiki/Manual:$wgAllowUserJs
[2] https://www.mediawiki.org/wiki/Manual:$wgAllowUserCss
[3] https://en.wikipedia.org/wiki/Wikipedia:User_scripts
[4] https://wiki.archlinux.org/index.php/Wiki_Monkey
[5] https://projects.archlinux.org/vhosts/wiki.archlinux.org.git/