line 1 column 1 - Warning: missing <!DOCTYPE> declaration
line 16 column 1 - Info: value for attribute "type" missing quote marks
line 18 column 1 - Info: value for attribute "type" missing quote marks
line 20 column 1 - Info: value for attribute "type" missing quote marks
line 25 column 1 - Info: value for attribute "type" missing quote marks
line 26 column 1 - Info: value for attribute "type" missing quote marks
line 29 column 38 - Info: value for attribute "type" missing quote marks
line 31 column 48 - Info: value for attribute "type" missing quote marks
line 136 column 1 - Info: value for attribute "rows" missing quote marks
line 136 column 1 - Info: value for attribute "cols" missing quote marks
line 141 column 1 - Info: value for attribute "rows" missing quote marks
line 141 column 1 - Info: value for attribute "cols" missing quote marks
line 148 column 1 - Info: value for attribute "rows" missing quote marks
line 148 column 1 - Info: value for attribute "cols" missing quote marks
line 152 column 1 - Warning: <form> shouldn't be nested
line 152 column 1 - Warning: missing </form>
line 12 column 1 - Warning: missing </form>
line 12 column 1 - Warning: <form> escaping malformed URI reference
line 12 column 1 - Warning: <form> illegal characters found in URI
line 42 column 1 - Warning: trimming empty <p>
line 138 column 1 - Warning: trimming empty <p>
line 143 column 1 - Warning: trimming empty <p>
Info: Document content looks like HTML5
Tidy found 9 warnings and 0 errors!

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

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