MediaWiki:Common.js
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/* Any JavaScript here will be loaded for all users on every page load. */
mw.hook('wikipage.categories').add((content) => {
if (content[0].id == 'catlinks' && content[0].childElementCount > 0) {
content
.wrap('<details></details>')
.closest('details')
.prepend('<summary>Show full category list</summary>');
}
});
