line 1 column 1 - Warning: missing <!DOCTYPE> declaration
line 7 column 1 - Warning: <a> isn't allowed in <table> elements
line 6 column 1 - Info: <table> previously mentioned
line 6 column 1 - Warning: The summary attribute on the <table> element is obsolete in HTML5
Info: Document content looks like HTML5
Tidy found 3 warnings and 0 errors!

You are recommended to use CSS to specify the font and
properties such as its size and color. This will reduce
the size of HTML files and make them easier to maintain
compared with using <FONT> elements.

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