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The validator reports element names not valid even if looking HTML all seems ok. I tryed to validate the browser HTML output and all i validated if the last sctipt tag of "obout treeview" section is commented.
This is an ASP.net bogus behavior. See http://www.w3.org/Bugs/Public/show_bug.cgi?id=3734#c1 for a fix. *** This bug has been marked as a duplicate of bug 3734 ***