MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
// Vector 2022: open main menu by default for logged-out users on desktop
(function () {
  if (mw.config.get('wgUserName')) return; // logged-out only
  if (!window.matchMedia('(min-width: 1120px)').matches) return;

  function open() {
    const cb = document.getElementById('vector-main-menu-dropdown-checkbox');
    if (cb) {
      cb.checked = true;
      cb.dispatchEvent(new Event('change', { bubbles: true }));
    }
  }

  open();
  window.addEventListener('load', open);
  setTimeout(open, 150);
  setTimeout(open, 600);
})();