Ticket #2765: 2765_4.patch

_source/core/htmlparser/element.js

@@ -112 +112 @@
                         for ( var i = 0, len = attribsArray.length ; i < len ; i++ )
                         {
                                 var attrib = attribsArray[ i ];
+                                // IE's treated expand fields as dom attributes, skip it
+                                if ( CKEDITOR.env.ie && attrib === '_cke_expando' )
+                                        continue;
                                 writer.attribute( attrib[0], attrib[1] );
                         }