MediaWiki:Common.js

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mw.hook('wikipage.content').add(function($c){
  $c.find('a[target="_blank"]').each(function(){
    if (!this.rel || this.rel.indexOf('noopener') === -1) this.rel = (this.rel ? this.rel + ' ' : '') + 'noopener';
    if (this.rel.indexOf('noreferrer') === -1) this.rel += ' noreferrer';
  });
});