Errors:
Attribute “xmlns:article” not allowed here.
Attribute “xmlns:book” not allowed here.
Attribute “xmlns:product” not allowed here.
Attribute “xmlns:profile” not allowed here.
Attribute “xmlns:video” not allowed here.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
The element “button” must not appear as a descendant of the “a” element.
Bad value “header” for attribute “role” on element “header”.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
Attribute with the local name “xmlns:article” is not serializable as XML 1.0.
Attribute with the local name “xmlns:book” is not serializable as XML 1.0.
Attribute with the local name “xmlns:product” is not serializable as XML 1.0.
Attribute with the local name “xmlns:profile” is not serializable as XML 1.0.
Attribute with the local name “xmlns:video” is not serializable as XML 1.0.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
The “contentinfo” role is unnecessary for element “footer”.
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