Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “complementary” role is unnecessary for element “aside”.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Attribute “<a” is not serializable as XML 1.0.
The first occurrence of ID “footer_wrapper” was here.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
Errors:
Element “div” not allowed as child of element “h1” in this context. (Suppressing further errors from this subtree.)
Attribute “about” not allowed on element “article” at this point.
Attribute “content” not allowed on element “span” at this point.
Attribute “datatype” not allowed on element “span” at this point.
Attribute “rel” not allowed on element “span” at this point.
When the attribute “xml:lang” in no namespace is specified, the element must also have the attribute “lang” present with the same value.
Attribute “about” not allowed on element “span” at this point.
Attribute “rel” not allowed on element “div” at this point.
Attribute “datatype” not allowed on element “a” at this point.
The “align” attribute on the “div” element is obsolete. Use CSS instead.
Attribute “border” not allowed on element “input” at this point.
The “font” element is obsolete. Use CSS instead.
Saw “<” when expecting an attribute name. Probable cause: Missing “>” immediately before.
Attribute “<a” not allowed on element “br” at this point.
Attribute “target” not allowed on element “br” at this point.
Attribute “href” not allowed on element “br” at this point.
Stray end tag “a”.
Duplicate ID “footer_wrapper”.
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