lang="" vs HTTP
Assertion holds if you see green below.
This test is only valid if the user agent recognises the HTTP and html lang declarations, and :lang works.
| Ignore this test. (:lang not supported) |
Assertion: If the HTTP header contains a language declaration but the html element uses an empty lang attribute, the UA will not recognize the language declared in the HTTP header.
Notes:
Red means the HTTP had precedence.