line 1 column 1 - Warning: missing <!DOCTYPE> declaration
line 4 column 1 - Warning: discarding unexpected <frame>
line 5 column 1 - Error: <overlay> is not recognized!
line 5 column 1 - Warning: discarding unexpected <overlay>
line 9 column 1 - Warning: <spacer> isn't allowed in <tr> elements
line 8 column 1 - Info: <tr> previously mentioned
line 5 column 1 - Warning: missing </noframes>
line 1 column 1 - Warning: inserting missing 'title' element
line 8 column 1 - Warning: trimming empty <tr>
line 2 column 1 - Warning: <frameset> element removed from HTML5
line 5 column 1 - Warning: <noframes> element removed from HTML5
line 9 column 1 - Warning: <spacer> is not approved by W3C
line 6 column 1 - Warning: <bgsound> is not approved by W3C
Info: Document content looks like HTML5
Tidy found 11 warnings and 1 error!

This document has errors that must be fixed before
using HTML Tidy to generate a tidied up version.

You are recommended to use CSS for controlling white
space (e.g. for indentation, margins and line spacing).
The proprietary <SPACER> element has limited vendor support.

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