XHTML lang without xml:lang

greek text

inuktitut text

akan text

Assertion: ERROR: A tag uses an xml:lang attribute without an associated lang attribute. (2 tags) (html5)
WARNING: A tag uses an xml:lang attribute without an associated lang attribute. (2 tags) (xhtmlH)
WARNING: This HTML file contains xml:lang attributes (3 tags) (html)

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xhtml11 as xml