Warnings:
The “type” attribute is unnecessary for JavaScript resources.
The “banner” role is unnecessary for element “header”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “publishLink” was here.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
The “contentinfo” role is unnecessary for element “footer”.
Errors:
A “charset” attribute on a “meta” element found after the first 1024 bytes.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “ImageToolbar” for attribute “http-equiv” on element “meta”.
Duplicate ID “publishLink”.
Attribute “menu-icon” not allowed on element “a” at this point.
Attribute “current-discipline” not allowed on element “a” at this point.
Duplicate attribute “id”.
Attribute “ga-on” not allowed on element “a” at this point.
Attribute “ga-event-label” not allowed on element “a” at this point.
Attribute “ga-event-category” not allowed on element “a” at this point.
Duplicate attribute “class”.
No “li” element in scope but a “li” end tag seen.
Element “img” is missing required attribute “src”.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Stray end tag “span”.
End tag “div” seen, but there were open elements.
Unclosed element “span”.
Bad value “tel:+49 (0)30 - 2084712 50” for attribute “href” on element “a”: Illegal character in scheme data: space is not allowed.
Attribute “autocorrect” not allowed on element “input” at this point.
The value of the “for” attribute of the “label” element must be the ID of 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.
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