Errors:
Bad value “cache-control” for attribute “http-equiv” on element “meta”.
Bad value “” for attribute “href” on element “link”: Must be non-empty.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
The “itemtype” attribute must not be specified on elements that do not have an “itemscope” attribute specified.
Text not allowed in element “ul” in this context.
End tag “li” seen, but there were open elements.
Unclosed element “div”.
Element “div” is missing one or more of the following attributes: “role”.
Attribute “href” not allowed on element “li” at this point.
Duplicate ID “form-search”.
Bad value “” for attribute “srcset” on element “source”: Must contain one or more image candidate strings.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
Empty heading.
The first occurrence of ID “form-search” was here.
The “main” role is unnecessary for element “main”.
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