2.1.21 [CSS-Level2-2009] Section 5.11.4, The language pseudo-class: :lang

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V0017:

The specification states:

 The pseudo-class ':lang(C)' matches if the element is in language C. Whether there 
 is a match is based solely on the identifier C being either equal to, or a hyphen-
 separated substring of, the element's language value, in the same way as if 
 performed by the '|=' operator. The matching of C against the element's language 
 value is performed case-insensitively for characters within the ASCII range. The identifier C does not have to be a valid 
 language name.
  
 C must not be empty.

Quirks Mode and IE7 Mode (All Versions)

The pseudo-class :lang is not supported.