MediaWiki has many extension systems. There is a way to add javascript code or CSS upon page load, and to configure for this to happen independently for each user or site-wide. See [https://www.mediawiki.org/wiki/Extension:Gadgets MediaWiki's documentation].
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MediaWiki has many extension systems. There is a way to add javascript code or CSS upon page load, and to configure for this to happen independently for each user or site-wide. See [https://www.mediawiki.org/wiki/Extension:Gadgets MediaWiki's documentation].
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===Common.js system===
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* gadgets are site-wide javascript, which can be configured by the admin to be opt-in or opt-out, with users able to change the choice in
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Currently, wiki.personaldata.io does not have that part of the system enabled.
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* common.js are also site-wide javascript, and defined on PersonalData.IO [http://wiki.personaldata.io/wiki/MediaWiki:Common.js here]
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* user-scripts are custom javascript, set up by each user separately. Yours is [https://www.mediawiki.org/wiki/Special:MyPage/common.js here]