Oknoplast.com.pl W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “cache-control” for attribute “http-equiv” on element “meta”.
Bad value “expires” for attribute “http-equiv” on element “meta”.
Bad value “pragma” for attribute “http-equiv” on element “meta”.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Duplicate ID “bootstrap-css-css”.
Element “div” not allowed as child of element “label” in this context. (Suppressing further errors from this subtree.)
The “font” element is obsolete. Use CSS instead.
End tag “b” violates nesting rules.
No “font” element in scope but a “font” end tag seen.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Warnings:
The first occurrence of ID “bootstrap-css-css” was here.
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 an empty “lang” attribute. Consider using “lang="pl"” (or variant) instead.
Poland PL