Errors:
Bad value “en_US” for attribute “lang” on element “html”: The language subtag “en_us” is not a valid language subtag.
Element “meta” is missing one or more of the following attributes: “content”, “property”.
Element “meta” is missing one or more of the following attributes: “charset”, “content”, “http-equiv”, “itemprop”, “name”, “property”.
Stray end tag “meta”.
Bad value “menu” for attribute “role” on element “button”.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Attribute “type” not allowed on element “span” at this point.
Attribute “name” not allowed on element “span” at this point.
Element “div” not allowed as child of element “label” in this context. (Suppressing further errors from this subtree.)
The “label” element may contain at most one “button”, “input”, “meter”, “output”, “progress”, “select”, or “textarea” descendant.
Bad value “true” for attribute “checked” on element “input”.
Element “optgroup” is missing required attribute “label”.
Attribute “accept” not allowed on element “input” at this point.
Attribute “for” not allowed on element “div” at this point.
Element “div” not allowed as child of element “h2” in this context. (Suppressing further errors from this subtree.)
An element with the attribute “tabindex” must not appear as a descendant of the “button” element.
Element “img” is missing required attribute “src”.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
The “align” attribute on the “div” element is obsolete. Use CSS instead.
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”.
The “aria-labelledby” attribute must point to an element in the same document.
The “aria-controls” attribute must point to an element in the same document.
Warnings:
The “type” attribute is unnecessary for JavaScript resources.
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
“label” element with multiple labelable descendants.
Attribute “aria-required” is unnecessary for elements that have attribute “required”.
The “button” role is unnecessary for element “button”.
The “contentinfo” role is unnecessary for element “footer”.
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