MediaWiki:Common.js

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// MediaWiki:Common.js
(function () {
  function tagAll($root) {
    $root.find('a[target="_blank"]').each(function () {
      var rel = this.rel || '';
      if (!/\bnoopener\b/.test(rel)) rel += (rel ? ' ' : '') + 'noopener';
      if (!/\bnoreferrer\b/.test(rel)) rel += (rel ? ' ' : '') + 'noreferrer';
      this.rel = rel;
    });
  }

  // Run once on the whole document (covers header/indicators/skin chrome)
  $(function () { tagAll($(document)); });

  // Run again for content inserted later (e.g., after navigation/ajax)
  mw.hook('wikipage.content').add(function ($c) { tagAll($c); });
})();