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Running the IETF reference checker on the list of references in HTML5, it came out with the following warning: [[ The reference " PKCS #1: RSA Encryption " is obsoleted by RFC 2437, The reference " http://tools.ietf.org/html/rfc2313 " is obsoleted by RFC 2437, The reference " Internationalizing Domain Names in Applications (IDNA) " is obsoleted by RFC 5890, RFC 5891, The reference " http://tools.ietf.org/html/rfc3490 " is obsoleted by RFC 5890, RFC 5891, The reference " The Codecs Parameter for "Bucket" Media Types " is obsoleted by RFC 6381, The reference " http://tools.ietf.org/html/rfc4281 " is obsoleted by RFC 6381, ]] http://services.w3.org/xslt?xslfile=http%3A%2F%2Fwww.w3.org%2F2007%2F05%2Fietf-references-checker&xmlfile=http%3A%2F%2Fservices.w3.org%2Ftidy%2Ftidy%3FdocAddr%3Dhttp%253A%252F%252Fwww.w3.org%252FTR%252Fhtml5%252Freferences.html%26passThroughXHTML%3D1
Closed by f54b10d, thanks!