line 1 column 1 - Warning: missing <!DOCTYPE> declaration
line 8 column 41 - Warning: <hr> isn't allowed in <dt> elements
line 8 column 1 - Info: <dt> previously mentioned
line 12 column 41 - Warning: <hr> isn't allowed in <dt> elements
line 12 column 1 - Info: <dt> previously mentioned
line 7 column 5 - Warning: <img> lacks "alt" attribute
line 8 column 5 - Warning: <img> lacks "alt" attribute
line 11 column 5 - Warning: <img> lacks "alt" attribute
line 12 column 5 - Warning: <img> lacks "alt" attribute
line 8 column 41 - Warning: trimming empty <dt>
line 12 column 41 - Warning: trimming empty <dt>
Info: Document content looks like HTML5
Tidy found 9 warnings and 0 errors!

The alt attribute should be used to give a short description
of an image; longer descriptions should be given with the
longdesc attribute which takes a URL linked to the description.
These measures are needed for people using non-graphical browsers.

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