Ticket #3737: 3737.patch

_source/core/htmlparser.js

@@ -171 +171 @@
                                 // Opening tag
                                 if ( ( tagName = parts[ 3 ] ) )
                                 {
+                                        tagName = tagName.toLowerCase();
                                         var attribs = {},
                                                 attribMatch,
                                                 attribsPart = parts[ 4 ],
@@ -190 +191 @@
                                                 }
                                         }
 
-                                        this.onTagOpen( tagName.toLowerCase(), attribs, selfClosing );
+                                        this.onTagOpen( tagName, attribs, selfClosing );
 
                                         // Open CDATA mode when finding the appropriate tags.
                                         if ( !cdata && CKEDITOR.dtd.$cdata[ tagName ] )