code: function getStyleComputedProperty(element, property) {
      if (element.nodeType !== 1) {
        return [];
      } // NOTE: 1 DOM access here
  
  
      var window = element.ownerDocument.defaultView;
      var css = window.getComputedStyle(element, null);
      return property ? css[property] : css;
    }
docs: Get CSS computed property of the given element
  @method
  @memberof Popper.Utils
  @argument {Eement} element
  @argument {String} property