line 6 column 1 - Info: value for attribute "http-equiv" missing quote marks
line 7 column 1 - Info: value for attribute "name" missing quote marks
line 7 column 1 - Info: value for attribute "content" missing quote marks
line 8 column 1 - Info: value for attribute "name" missing quote marks
line 9 column 1 - Info: value for attribute "name" missing quote marks
line 13 column 1 - Info: value for attribute "lang" missing quote marks
Info: Document content looks like XHTML5
Tidy found 3 warnings and 0 errors! Not all warnings/errors were shown.

About HTML Tidy: https://github.com/htacg/tidy-html5
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https://github.com/htacg/tidy-html5/blob/master/README/LOCALIZE.md