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I ran my web site through your validator and got the following error: element "DIV" undefined. <DIV> To clear this I need to change the tag to <div>; WHICH IS WRONG. HTML tags are supposed to be uppercase. It is just good programming practice. It make the code more readable, thus, easier to maintain. Anyone who thinks otherwise is wrong and a hippie.
HTML elements are case-insensitive. XHTML elements are case-sensitive and must be written in lower case. http://www.w3.org/TR/xhtml1/#diffs