:lang(es), lang="es-MX"

Ignore this test. (:lang with lang is not supported)
You can only get meaningful results for this test if :lang works with lang, since it checks a detail with regard to that support.

Assertion: A :lang value will match a lang attribute value when the latter contains additional subtags.

Notes:You can only get meaningful results for this test if :lang works with lang, since it checks a detail with regard to that support. If :lang does not work with lang, the test should show a message "Ignore this test." You should ignore the instructions and test results that follow and mark the results as "not applicable".