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[2]W3C [3]Markup Validation Service

   Check the markup (HTML, XHTML, ...) of Web documents

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     * [4]Error(s) blocking validation

Sorry! This document cannot be checked.

    1. Error
    No Referer header found!
       You have requested we check the referring page, but your browser did not send
       the HTTP "Referer" header field. This can be for several reasons, but most
       commonly it is because your browser does not know about this header, has been
       configured not to send one, transferred the referring document over a secure
       protocol such as https but is accessing the validator over ordinary
       non-secure http, or is behind a proxy or firewall that strips it out of the
       request before it reaches us.
       This is not an error in the referring page!
       Please use the form interface on the [5]Validator Home Page (or the
       [6]Extended Interface) to check the page by URL.

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References

   1. https://validator.w3.org/./
   2. http://www.w3.org/
   3. https://validator.w3.org/./
   4. https://validator.w3.org/check?uri=referer#fatal-errors
   5. https://validator.w3.org/./
   6. https://validator.w3.org/detailed.html
   7. https://validator.w3.org/
   8. https://validator.w3.org/about.html
   9. https://validator.w3.org/whatsnew.html
  10. https://validator.w3.org/docs/
  11. https://validator.w3.org/docs/help.html
  12. https://validator.w3.org/feedback.html
  13. https://validator.w3.org/contribute.html
  14. https://www.w3.org/Status
  15. https://www.w3.org/donate/
  16. https://www.w3.org/
  17. https://www.w3.org/policies/#disclaimers
  18. https://www.w3.org/policies/#trademarks
  19. https://www.w3.org/copyright/document-license/