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The validator indicates this error on my page when I make a check on my server : Line 128, column 6: end tag for element "P" which is not open </p> But indicates that all is corect when I check the same page on my computer. In fact there is no </p> at all !
Cannot reproduce this with the URI given (the page is still invalid at the time of this comment, but with different errors). The Markup Validator does not invent markup, if it references some markup, then this markup is present in the served version of the page. Differences between a local html doc and served version may come from server processing. I suggest using the "show source" and possibly "parse tree" to see exactly where the validator actually points.