line 1 column 1 - Warning: missing declaration line 6 column 10 - Warning: The summary attribute on the element is obsolete in HTML5 Info: Document content looks like HTML5 2 warnings, 0 errors were found! About HTML Tidy: https://github.com/htacg/tidy-html5 Bug reports and comments: https://github.com/htacg/tidy-html5/issues Or send questions and comments to: https://lists.w3.org/Archives/Public/public-htacg/ Latest HTML specification: http://dev.w3.org/html5/spec-author-view/ Validate your HTML documents: http://validator.w3.org/nu/ Lobby your company to join the W3C: http://www.w3.org/Consortium