code: function mounted () {
      if (!inBrowser) {
        return;
      }
  
      /**
       * Center the popup on dual screens
       * http://stackoverflow.com/questions/4068373/center-a-popup-window-on-screen/32261263
       */
      var dualScreenLeft = $window.screenLeft !== undefined ? $window.screenLeft : screen.left;
      var dualScreenTop = $window.screenTop !== undefined ? $window.screenTop : screen.top;
  
      var width = $window.innerWidth ? $window.innerWidth : (document.documentElement.clientWidth ? document.documentElement.clientWidth : screen.width);
      var height = $window.innerHeight ? $window.innerHeight : (document.documentElement.clientHeight ? document.documentElement.clientHeight : screen.height);
  
      this.popup.left = ((width / 2) - (this.popup.width / 2)) + dualScreenLeft;
      this.popup.top = ((height / 2) - (this.popup.height / 2)) + dualScreenTop;
    }
docs: Sets popup default dimensions.