Gadgets are little bits of Javascript code that allow cool actions user side.
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[https://www.mediawiki.org/wiki/Extension:Gadgets "The Gadgets extension provides a way for users to pick JavaScript or CSS based "gadgets" that other wiki users provide."]
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* See [https://www.wikidata.org/wiki/Special:Gadgets Special:Gadgets on wikidata]
* See [https://www.wikidata.org/wiki/Special:Gadgets Special:Gadgets on wikidata]
* See [https://www.wikidata.org/wiki/MediaWiki:Gadgets-definition MediaWiki:Gagdgets-definition on wikidata]
* See [https://www.wikidata.org/wiki/MediaWiki:Gadgets-definition MediaWiki:Gagdgets-definition on wikidata]