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Your web Validator (http://validator.w3.org) raise 4 errors on asp.net 2.0 web-site, while the same page , saved as agenda.html, is validated without errors by validate_by_upload. Example: http://validator.w3.org/check?uri=http%3A%2F%2Fweb1.si.unimib.it%2Fagenda%2F&charset=%28detect+automatically%29&doctype=Inline&group=0 Your web validator does not recognize, div tag, in asp.net 2.0 pages. thank you.
Created attachment 487 [details] this is the file saved from page http://web1.si.unimib.it/agenda this is the file saved, from page http://web1.si.unimib.it/agenda. this file is validated without error, while the web page is validated with 4 error.
The errors *are* there when served by your server to the validator. It's a pity ASP.net is apparently so broken and does some browser sniffing , hence serving different content to GUI browsers and to the validator, (or maybe your code is bad, or maybe your asp.net server is misconfigured) but that's not the validator's fault.