1 files changed, 4 insertions, 5 deletions

diff --git a/sources/core/scriptloader.js b/sources/core/scriptloader.js
index 9ad536e..356996f 100644
--- a/sources/core/scriptloader.js
+++ b/sources/core/scriptloader.js
@@ -1,5 +1,5 @@
 /**
- * @license Copyright (c) 2003-2016, CKSource - Frederico Knabben. All rights reserved.
+ * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
  * For licensing, see LICENSE.md or http://ckeditor.com/license
  */
 
@@ -119,8 +119,8 @@ CKEDITOR.scriptLoader = ( function() {
                                         } );
 
                                         if ( callback ) {
-                                                if ( CKEDITOR.env.ie && CKEDITOR.env.version < 11 ) {
-                                                        // FIXME: For IE, we are not able to return false on error (like 404).
+                                                // The onload or onerror event does not fire in IE8 and IE9 Quirks Mode (http://dev.ckeditor.com/ticket/14849).
+                                                if ( CKEDITOR.env.ie && ( CKEDITOR.env.version <= 8 || CKEDITOR.env.ie9Compat ) ) {
                                                         script.$.onreadystatechange = function() {
                                                                 if ( script.$.readyState == 'loaded' || script.$.readyState == 'complete' ) {
                                                                         script.$.onreadystatechange = null;
@@ -130,13 +130,12 @@ CKEDITOR.scriptLoader = ( function() {
                                                 } else {
                                                         script.$.onload = function() {
                                                                 // Some browsers, such as Safari, may call the onLoad function
-                                                                // immediately. Which will break the loading sequence. (#3661)
+                                                                // immediately. Which will break the loading sequence. (http://dev.ckeditor.com/ticket/3661)
                                                                 setTimeout( function() {
                                                                         onLoad( url, true );
                                                                 }, 0 );
                                                         };
 
-                                                        // FIXME: Opera and Safari will not fire onerror.
                                                         script.$.onerror = function() {
                                                                 onLoad( url, false );
                                                         };