Errors:
Legacy doctype. Expected “<!DOCTYPE html>”.
The “profile” attribute on the “head” element is obsolete. To declare which “meta” terms are used in the document, instead register the names as meta extensions. To trigger specific UA behaviors, use a “link” element instead.
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.
Bad value “header” for attribute “role” on element “header”.
Element “h4” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
End tag “h3” seen, but there were open elements.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The element “button” must not appear as a descendant of the “a” element.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “style” not allowed as child of element “span” 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.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “banner” role is unnecessary for element “header”.
The “complementary” role is unnecessary for element “aside”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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