Under the tag "Working" you can quickly see which pages are currently validated and on validated page you can see if the page conforms to HTML 4 and CSS. If not, you can double-click the page and you will come to the place under the tag "Log" where each HTML 4 and CSS errors and warnings of that page are described. This log can also be saved or printed.
Web Validator uses the services of the World Wide Web Consortium and so errors in validation are almost impossible.
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