first commit

core/misc/drupal.init.js

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+// Allow other JavaScript libraries to use $.
+if (window.jQuery) {
+  jQuery.noConflict();
+}
+
+// Class indicating that JS is enabled; used for styling purpose.
+document.documentElement.className += ' js';
+
+// JavaScript should be made compatible with libraries other than jQuery by
+// wrapping it in an anonymous closure.
+
+(function (domready, Drupal, drupalSettings) {
+
+  'use strict';
+
+  // Attach all behaviors.
+  domready(function () { Drupal.attachBehaviors(document, drupalSettings); });
+
+})(domready, Drupal, window.drupalSettings);