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The HTML or XHTML code uses a valid DTD une des DTD from the list provided by the W3C. On this matter please read: document structure HTML-XHTML(OpenWeb tutorials) ;
Your site uses valid CSS code: CSS1 an/or CSS2. On this matter please read: page layout (OpenWeb tutorials) ;
The scripts in use on the site are conform to standards DOM1 and/or DOM2. On this matter please read: dynamic web pages (OpenWeb tutorials).