Errors:
Bad value “https://fonts.googleapis.com/css?family=Roboto:400,500,700|Roboto+Slab:300,400,500,700|Roboto+Condensed:400,300,700&subset=latin,latin-ext” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
Element “ul” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “ad” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Element “tabs” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
End tag “div” seen, but there were open elements.
Unclosed element “section”.
Stray end tag “div”.
Stray end tag “section”.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
Bad value “80%” for attribute “height” on element “iframe”: Expected a digit but saw “%” instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Warnings:
Attribute “:class” is not serializable as XML 1.0.
Attribute “:style” is not serializable as XML 1.0.
Attribute “@mouseleave” is not serializable as XML 1.0.
Attribute “@mouseover” is not serializable as XML 1.0.
Attribute “@show-menu” is not serializable as XML 1.0.
Attribute “:show” is not serializable as XML 1.0.
Attribute “@hiding” is not serializable as XML 1.0.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
This document appears to be written in Polish but the “html” start tag has “lang="en"”. Consider using “lang="pl"” (or variant) instead.
Poland PL