oint to an SVGElementInstance (the instanceRoot)
        function verifyDefs2(e)
        {
          var instance = document.getElementById("use2").instanceRoot;
          if (e.target === e.currentTarget &&   // Assertion: the target and currentTarget are the same
              e.target === instance)            // Assertion: the target is SVGElementInstance corresponding to the 'circle' element with id="defscircle2", since we dispatched the event to that instance
          {
            instance.correspond