insertCSS of cordova inappbrowser plugin doesn't work?

ionic-v1
1 
$scope.openIAB = function() {

      $rootScope.$on('$cordovaInAppBrowser:loadstop', function(e, event){ 
    alert('c'); //working 
         $cordovaInAppBrowser.insertCSS({
            code: 'body {background:blue;}'
          });
      });

    $ionicPlatform.ready(function() {
        $cordovaInAppBrowser
        .open(pathToSite, '_blank', iabDefaultSettings);

      });
    };

something is wrong ? I failed to use .insertCSS of cordova inappbrowser plugin.

2

Does @font-face property work on this browser?
I am trying to inject my custom font on external link and still failed to do so.