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The “version” attribute on the “html” element is obsolete.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.
The “profile” attribute on the “head” element is obsolete.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.
Bad value “x-dns-prefetch-control” for attribute “http-equiv” on element “meta”.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Element “script” must not have attribute “defer” unless attribute “src” is also specified.
Attribute “target-toggle” not allowed on element “span” at this point.
No space between attributes.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
End tag “footer” seen, but there were open elements.
Unclosed element “div”.
Attribute “defer” not allowed on element “iframe” at this point.
The “aria-controls” attribute must point to an element in the same document.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “type” attribute is unnecessary for JavaScript resources.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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