Errors:
Bad value “expires” for attribute “http-equiv” on element “meta”.
Bad value “cache-control” for attribute “http-equiv” on element “meta”.
Bad value “pragma” for attribute “http-equiv” on element “meta”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “span” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
A “link” element must not appear as a descendant of a “body” element unless the “link” element has an “itemprop” attribute or has a “rel” attribute whose value contains “dns-prefetch”, “pingback”, “preconnect”, “prefetch”, “preload”, “prerender”, or “stylesheet”.
Attribute “2” not allowed on element “span” at this point.
Stray end tag “ul”.
Duplicate ID “contact-popup”.
Bad value “skype:+49 30 255 555 726” for attribute “href” on element “a”: Illegal character in scheme data: space is not allowed.
No “p” element in scope but a “p” end tag seen.
Stray end tag “div”.
Bad value “1” for attribute “async” on element “script”.
Element “script” must not have attribute “async” unless attribute “src” is also specified.
Warnings:
The “navigation” role is unnecessary for element “nav”.
Empty heading.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Attribute “2” is not serializable as XML 1.0.
The first occurrence of ID “contact-popup” was here.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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