line 1 column 1 - Warning: missing <!DOCTYPE> declaration
line 7 column 1 - Warning: missing </font> before <ol>
line 8 column 9 - Warning: inserting implicit <font>
line 9 column 10 - Warning: inserting implicit <font>
line 10 column 10 - Warning: inserting implicit <font>
line 3 column 1 - Warning: blank 'title' element
line 7 column 1 - Warning: trimming empty <font>
Info: Document content looks like HTML5
Tidy found 7 warnings and 0 errors!

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.

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