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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns= "http://www.w3.org/1999/xhtml"> <head> <title></title> <object> <ruby> <rb></rb><rt></rt> </ruby> </object> </head> <body></body> </html> The validator sais it is [valid]. I'm not sure, but I don't think ruby should be in the head of a document...
Quickly reading the DTD, I believe the validator is correct. object is allowed in head, and object's valid contents include inline elements, and ruby is an inline element.