Index: /CKEditor/trunk/_source/core/htmlparser.js
===================================================================
--- /CKEditor/trunk/_source/core/htmlparser.js	(revision 3673)
+++ /CKEditor/trunk/_source/core/htmlparser.js	(revision 3674)
@@ -172,4 +172,5 @@
 				if ( ( tagName = parts[ 3 ] ) )
 				{
+					tagName = tagName.toLowerCase();
 					var attribs = {},
 						attribMatch,
@@ -191,5 +192,5 @@
 					}
 
-					this.onTagOpen( tagName.toLowerCase(), attribs, selfClosing );
+					this.onTagOpen( tagName, attribs, selfClosing );
 
 					// Open CDATA mode when finding the appropriate tags.