line 1 column 1 - Warning: missing declaration line 4 column 1 - Warning: discarding unexpected line 5 column 1 - Error: is not recognized! line 5 column 1 - Warning: discarding unexpected line 9 column 1 - Warning: isn't allowed in elements line 8 column 1 - Info: previously mentioned line 5 column 1 - Warning: missing line 1 column 1 - Warning: inserting missing 'title' element line 8 column 1 - Warning: trimming empty line 2 column 1 - Warning: element removed from HTML5 line 5 column 1 - Warning: element removed from HTML5 line 9 column 1 - Warning: <spacer> is not approved by W3C line 6 column 1 - Warning: <bgsound> is not approved by W3C Info: Document content looks like HTML5 Tidy found 11 warnings and 1 error! This document has errors that must be fixed before using HTML Tidy to generate a tidied up version. You are recommended to use CSS for controlling white space (e.g. for indentation, margins and line spacing). The proprietary <SPACER> element has limited vendor support. 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