[lang|="es"], lang="ES" (xml)
Ignore this test. (lang|= with lang attribute 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.
Test passes if you see green below.
Assertion: [Exploratory test] A lang|= value will match a lang attribute value regardless of case differences in a page served as XML.