Bugzilla – Bug 827
make meta Content-Language non-conforming (instead of obsolete-but-conforming)
Last modified: 2011-04-30 18:28:49 CEST
http://dev.w3.org/html5/spec/semantics.html#table-http-equiv
https://bitbucket.org/validator/validator/changeset/68205818671d https://bitbucket.org/validator/syntax/changeset/ee4be703e980