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Trying to validate a page, I got this error: Target: http://24.85.136.193/mike/stuff/electricsheep.html Please, validate your XML document first! Line 27 Column 71 The entity "mdash" was referenced, but not declared. My XML namespace is fine, and the XHTML validates just fine. I tried changing the — to — and it validated just fine, even though there are dozens of other — entities throughout the page. Then I reloaded the page, and it came up with the error again at the next — entity. I changed that one and reloaded, and it validated, but then when I reloaded yet again it produced an error...
Your test page is no longer available and I am unable to reproduce this. Your document probably lacked a document type declaration.