Wordswithoutborders.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “application/xhtml+xml; charset=utf-8” for attribute “content” on element “meta”: The legacy encoding declaration did not start with “text/html;”.
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Element “script” must not have attribute “async” unless attribute “src” is also specified.
Bad value “screen,projection” for attribute “media” on element “link”: Deprecated media type “projection”. For guidance, see the Media Types section in the current Media Queries specification.
Duplicate attribute “style”.
The element “button” must not appear as a descendant of the “a” element.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The element “a” must not appear as a descendant of the “button” element.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “contentinfo” role is unnecessary for element “footer”.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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