Ticket #5930: 5930.patch

_source/plugins/htmldataprocessor/plugin.js

@@ -240 +240 @@
         if ( CKEDITOR.env.ie )
         {
                 // IE outputs style attribute in capital letters. We should convert
-                // them back to lower case.
+                // them back to lower case, while not hurting the values (#5930)
                 defaultHtmlFilterRules.attributes.style = function( value, element )
                 {
-                        return value.toLowerCase();
+                        return value.replace( /(?:(^\s*|;\s*)([^\:]+))/g, function( match, separator, name )
+                                {
+                                        return separator + name.toLowerCase();
+                                });
                 };
         }