Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “c23644” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “main” role is unnecessary for element “main”.
Empty heading.
Errors:
Duplicate ID “c23644”.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
Element “noscript” not allowed as child of element “picture” in this context. (Suppressing further errors from this subtree.)
Element “a” not allowed as child of element “picture” in this context. (Suppressing further errors from this subtree.)
Element “picture” is missing a required instance of child element “img”.
Bad value “21.03.2018” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
End tag “br”.
Bad value “31.01.2018” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “08.11.2017” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “footer” for attribute “role” on element “footer”.
Named character reference was not terminated by a semicolon. (Or “&” should have been escaped as “&”.)
The “itemprop” attribute was specified, but the element is not a property of any item.
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