MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
/* Internal links new tab, sitewide or scope with a container if you prefer */
mw.loader.using( 'mediawiki.util', function () {
  // External
  document.querySelectorAll('a.external').forEach(function(a){
    a.setAttribute('target','_blank');
    a.setAttribute('rel','noopener noreferrer');
  });
});