[1] [CITE@en[Re: ''''''[''''''css3-selectors'''''']'''''' '''['''css4-selectors''']''' '''['''CSS21''']''' pseudo grammar  conflicts   with BCP 47 (RFC4647) for :lang()]]
( ([[Kang-Hao (Kenny) Lu]] 著, [TIME[2011-08-27 09:12:58 +09:00]] 版))
<http://lists.w3.org/Archives/Public/www-style/2011Aug/0639.html>