HTTP header and html xml:lang
Assertion holds if you see green below.
This test is only valid if the user agent recognises the HTTP and html xml:lang declarations, and :lang works.
|Ignore this test. (:lang not supported)|
Assertion: If there is a conflict between the language declarations in the HTTP header and the html element using xml:lang, the UA will recognize the language declared in the html element.
Red means the HTTP had precedence.