line 1 column 1 - Warning: missing <!DOCTYPE> declaration
line 4 column 1 - Warning: plain text not inside 'noframes' element
line 2 column 1 - Warning: missing </noframes>
line 1 column 1 - Warning: inserting missing 'title' element
line 1 column 1 - Warning: <frameset> element removed from HTML5
line 2 column 1 - Warning: <noframes> element removed from HTML5
Info: Document content looks like HTML5
Tidy found 6 warnings and 0 errors!

About HTML Tidy: https://github.com/htacg/tidy-html5
Bug reports and comments: https://github.com/htacg/tidy-html5/issues
Official mailing list: https://lists.w3.org/Archives/Public/public-htacg/
Latest HTML specification: https://html.spec.whatwg.org/multipage/
Validate your HTML documents: https://validator.w3.org/nu/
Lobby your company to join the W3C: https://www.w3.org/Consortium

Do you speak a language other than English, or a different variant of 
English? Consider helping us to localize HTML Tidy. For details please see 
https://github.com/htacg/tidy-html5/blob/master/README/LOCALIZE.md
