line 7 column 1 - Warning: <ul> isn't allowed in <tr> elements
line 6 column 1 - Info: <tr> previously mentioned
line 11 column 1 - Warning: discarding unexpected </ul>
line 5 column 1 - Warning: <table> lacks "summary" attribute
line 7 column 1 - Warning: trimming empty <ul>
Info: Doctype given is "-//W3C//DTD HTML 4.0 Transitional//EN"
Info: Document content looks like HTML 4.01 Strict
Info: No system identifier in emitted doctype
Tidy found 4 warnings and 0 errors!

The table summary attribute should be used to describe
the table structure. It is very helpful for people using
non-visual browsers. The scope and headers attributes for
table cells are useful for specifying which headers apply
to each table cell, enabling non-visual browsers to provide
a meaningful context for each cell.

For further advice on how to make your pages accessible
see https://www.w3.org/WAI/GL.
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