Ttbook.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
X-UA-Compatible HTTP header must have the value “IE=edge”, was “IE=Edge,chrome=1”.
Bad value “cleartype” for attribute “http-equiv” on element “meta”.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “https://fonts.googleapis.com/css?family=Roboto+Condensed:regular|David+Libre:500|Fira+Sans:500|PT+Sans:regular&subset=latin” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “center” element is obsolete. Use CSS instead.
Bad value “footer” for attribute “role” on element “footer”.
Stray end tag “a”.
Start tag “button” seen but an element of the same type was already open.
End tag “div” seen, but there were open elements.
Unclosed element “button”.
Bad value “https://www.facebook.com/tr?id=238208103540073&ev=PageView
&noscript=1” for attribute “src” on element “img”: Tab, new line or carriage return found.
Warnings:
The “type” attribute is unnecessary for JavaScript resources.
The “button” role is unnecessary for element “button”.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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