MediaWiki wikis allow users to customise the JavaScript and CSS of the wiki via code contained in JS/CSS wiki pages under their own profile or in the protected "MediaWiki" namespace, where they can also be enabled for all users.
The most commonly used among these so called "user scripts" are often promoted by sysops into fine-grained "gadgets", that is they can be easily enabled by any user of the same wiki in their preferences or they can be made default for everyone. On Wikimedia projects alone, thousands gadgets exist. The VCS for all this code is generally MediaWiki itself, often with hundreds (unintentional) forks of a single gadget.
See for instance a list of Wikipedia gadgets: https://meta.wikimedia.org/wiki/Gadgets/wikipedia Some more examples in the links section.
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30 Day SummaryOct 8 2025 — Nov 7 2025
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12 Month SummaryNov 7 2024 — Nov 7 2025
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