Errors:
When the attribute “xml:lang” in no namespace is specified, the element must also have the attribute “lang” present with the same value.
The “version” attribute on the “html” element is obsolete. You can safely omit it.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
Bad value “cleartype” for attribute “http-equiv” on element “meta”.
Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.
Duplicate ID “logo”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “about” not allowed on element “article” at this point.
Attribute “content” not allowed on element “span” at this point.
Attribute “rel” not allowed on element “span” at this point.
Attribute “datatype” not allowed on element “span” at this point.
The text content of element “time” was not in the required format: The literal did not satisfy the time-datetime format.
The text content of element “script” was not in the required format: Expected space, tab, newline, or slash but found “<” instead.
Bad value “layout” for attribute “role” on element “div”.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “banner” role is unnecessary for element “header”.
The first occurrence of ID “logo” was here.
Empty heading.
The “article” role is unnecessary for element “article”.
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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