| deprecated-tag-haswarn.html | must be a valid BCP 47 language tag, or the empty string | 188 | 
        
          | empty-isvalid.html | must be a valid BCP 47 language tag, or the empty string | 170 | 
        
          | extlang-bad-novalid.html | must be a valid BCP 47 language tag, or the empty string | 187 | 
        
          | xmllang-different-value-novalid.html | When "xml:lang" is specified, the element must also have "lang" present with the same value | 221 | 
        
          | xmllang-only-novalid.html | When "xml:lang" is specified, the element must also have "lang" present with the same value | 211 | 
        
          | xmllang-same-isvalid.html | When "xml:lang" is specified, the element must also have "lang" present with the same value | 221 |