Errors:
Duplicate attribute “lang”.
Bad value “revision” for attribute “rel” on element “link”: The string “revision” is not a registered keyword.
Text not allowed in element “iframe” in this context.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “” for attribute “id” on element “a”: An ID must not be the empty string.
Bad value “” for attribute “name” on element “a”: An ID must not be the empty string.
Bad value “” for attribute “target” on element “a”: Browsing context name must be at least one character long.
Duplicate ID “”.
End tag “div” seen, but there were open elements.
Unclosed element “nav”.
Unclosed element “header”.
Stray end tag “nav”.
Stray end tag “header”.
Element “script” must not have attribute “charset” unless attribute “src” is also specified.
Attribute “webkitallowfullscreen” not allowed on element “iframe” at this point.
Attribute “mozallowfullscreen” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Duplicate attribute “id”.
Duplicate attribute “class”.
Element “img” is missing required attribute “src”.
Stray end tag “div”.
The “for” attribute of the “label” element must refer to a non-hidden form control.
The “aria-labelledby” 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:
Consider avoiding viewport values that prevent users from resizing documents.
The “navigation” role is unnecessary for element “nav”.
The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
The first occurrence of ID “” was here.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “article” role is unnecessary for element “article”.
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