line 1 column 1 - Warning: missing <!DOCTYPE> declaration
line 2 column 32 - Warning: replacing invalid character code 150
line 8 column 12 - Warning: replacing invalid numeric character reference 150
line 8 column 31 - Warning: replacing invalid numeric character reference 150
line 9 column 9 - Warning: replacing invalid numeric character reference 150
line 10 column 9 - Warning: replacing invalid numeric character reference 150
line 12 column 5 - Warning: replacing invalid numeric character reference 150
line 14 column 5 - Warning: replacing invalid numeric character reference 150
line 16 column 5 - Warning: replacing invalid numeric character reference 150
line 18 column 5 - Warning: replacing invalid numeric character reference 150
line 20 column 5 - Warning: replacing invalid numeric character reference 150
Info: Document content looks like HTML5
Tidy found 11 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.

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