line 1 column 1 - Warning: missing <!DOCTYPE> declaration
line 7 column 15 - Warning: discarding unexpected </td>
line 6 column 1 - Warning: missing </pre> before <tr>
line 7 column 24 - Warning: plain text isn't allowed in <tr> elements
line 7 column 20 - Info: <tr> previously mentioned
line 8 column 1 - Warning: discarding unexpected </pre>
line 9 column 1 - Warning: <pre> isn't allowed in <tr> elements
line 7 column 20 - Info: <tr> previously mentioned
line 10 column 15 - Warning: discarding unexpected </td>
line 10 column 20 - Warning: missing <td>
line 10 column 24 - Warning: plain text isn't allowed in <tr> elements
line 10 column 20 - Info: <tr> previously mentioned
line 11 column 1 - Warning: discarding unexpected </pre>
line 10 column 20 - Warning: trimming empty <tr>
Info: Document content looks like HTML5
Tidy found 11 warnings and 0 errors!

One or more empty elements were present in the source document but
dropped on output. If these elements are necessary or you don't want
this behavior, then consider setting the option "drop-empty-elements"
to no.

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