Some gadgets don't work in one specific skin (often because they aren't designed for mobile/Minerva), yet we have to list all the deployed skins except that one to implement this, e.g.
ReferenceTooltips[ResourceLoader|default|skins=vector,vector-2022,monobook,timeless,modern,cologneblue|type=general|dependencies=mediawiki.cookie,jquery.client]|ReferenceTooltips.js|ReferenceTooltips.css
It would be neater if we could just write
...|skins=!minerva|...
or
...|disableskins=minerva|...