docs: function getWavesEffectElement(e) {
      if (TouchHandler.allowEvent(e) === false) {
        return null;
      }
  
      var element = null;
      var target = e.target || e.srcElement;
  
      while (target.parentNode !== null) {
        if (!(target instanceof SVGElement) && target.className.indexOf('waves-effect') !== -1) {
          element = target;
          break;
        }
        target = target.parentNode;
      }
      return element;
    }