Bitkom.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “screen, projection” for attribute “media” on element “link”: Deprecated media type “projection”. For guidance, see the Media Types section in the current Media Queries specification.
Bad value “” for attribute “href” on element “link”: Must be non-empty.
Bad value “tabpanel” for attribute “role” on element “form”.
Stray end tag “ul”.
End tag “div” seen, but there were open elements.
Unclosed element “nav”.
Stray end tag “div”.
Stray end tag “nav”.
The “aria-controls” attribute must point to an element in the same document.
Warnings:
The “banner” role is unnecessary for element “header”.
The “main” role is unnecessary for element “main”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
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