drupal/core/misc/drupal.init.js

/**
* DO NOT EDIT THIS FILE.
* See the following change record for more information,
* https://www.drupal.org/node/2815083
* @preserve
**/

if (window.jQuery) {
  jQuery.noConflict();
}

document.documentElement.className += ' js';

(function (Drupal, drupalSettings) {
  var domReady = function domReady(callback) {
    var listener = function listener() {
      callback();
      document.removeEventListener('DOMContentLoaded', listener);
    };

    if (document.readyState !== 'loading') {
      setTimeout(callback, 0);
    } else {
      document.addEventListener('DOMContentLoaded', listener);
    }
  };

  domReady(function () {
    Drupal.attachBehaviors(document, drupalSettings);
  });
})(Drupal, window.drupalSettings);