MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

mw.loader.using('jquery.makeCollapsible').done(function () {
  // Target sidebar portlets (each "box" in the sidebar)
  $('#p-navigation, #p-tb, #p-wiki-navigation, #p-coll-print_export').addClass('mw-collapsible mw-collapsed');

  // Auto-apply collapsible behavior
  $('.mw-collapsible').makeCollapsible();
});