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IE5 Macintosh and IE6Win read DOCTYPE and if a DTD URL is specified, load the DTD and compare your document's syntax against it. If your document does not comply completely with the DTD, a syntax error may be generated.
Edited by: bill
<body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
This alone would trip an IE6 syntax error. So, our alternative would be to remove the DTD reference or write a custom DTD to link to.