line 1 column 1 - Warning: missing declaration line 3 column 17 - Info: tidy replaced adjacent "-" with "=" line 4 column 1 - Warning: missing before line 12 column 1 - Warning: inserting implicit line 1 column 1 - Warning: proprietary attribute "xmlns:msxsl" line 1 column 1 - Warning: proprietary attribute "xmlns:user" Info: Document content looks like XHTML5 Tidy found 5 warnings and 0 errors! 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