Unknown Parse Mode!

The MIME Media Type (text/html) for this document is used to serve both SGML and XML based documents, and it is not possible to disambiguate it based on the DOCTYPE Declaration in your document. Parsing will continue in SGML mode.

Byte-Order Mark found in UTF-8 File.

The Unicode Byte-Order Mark (BOM) in UTF-8 encoded files is known to cause problems for some text editors and older browsers. You may want to consider avoiding its use until it is better supported.

Sorry! This document can not be checked.

Fatal Error: cannot find "http: // www.w3.org/TR/xhtmll/DTD/xhtmll-strict.dtd"; tried

I could not parse this document, because it makes reference to a system-specific file instead of using a well-known public identifier to specify the type of markup being used.

You should place a DOCTYPE declaration as the very first thing in your HTML document. For example, for a typical XHTML 1.0 document: 

      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
      <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
        <head>
          <title>Title</title>
        </head>

        <body>
          <!-- ... body of document ... -->
        </body>
      </html>

For XML documents, you may also wish to include an "XML Declaration" even before the DOCTYPE Declaration, but this is not well supported in older browsers. More information about this can be found in the XHTML 1.0 Recommendation.

Valid XHTML 1.0! The W3C Validator Team