line 1 column 1 - Warning: missing <!DOCTYPE> declaration
line 7 column 17 - Warning: numeric character reference "&#128" doesn't end in ';'
line 7 column 17 - Warning: replacing invalid numeric character reference 128
line 8 column 17 - Warning: unescaped & or unknown entity "&#x128"
line 9 column 17 - Warning: unescaped & or unknown entity "&#X128"
line 7 column 1 - Warning: <a> escaping malformed URI reference
Info: Document content looks like HTML5
Tidy found 6 warnings and 0 errors!

Character codes 128 to 159 (U+0080 to U+009F) are not allowed in HTML;
even if they were, they would likely be unprintable control characters.
Tidy assumed you wanted to refer to a character with the same byte value in the 
specified encoding and replaced that reference with the Unicode 
equivalent.

URIs must be properly escaped, they must not contain unescaped
characters below U+0021 including the space character and not
above U+007E. Tidy escapes the URI for you as recommended by
HTML 4.01 section B.2.1 and XML 1.0 section 4.2.2. Some user agents
use another algorithm to escape such URIs and some server-sided
scripts depend on that. If you want to depend on that, you must
escape the URI on your own. For more information please refer to
https://www.w3.org/International/O-URL-and-ident.html

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