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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <script type="text/javascript"> function pouic(){ alert(document.documentElement.getAttribute('xmlns')) alert(document.doctype) alert(document.doctype.systemId) } </script> </head> gjkgjhg </html>