Ncbj.gov.pl W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Saw “<” when expecting an attribute name. Probable cause: Missing “>” immediately before.
End tag had attributes.
When the attribute “xml:lang” in no namespace is specified, the element must also have the attribute “lang” present with the same value.
The element “img” with the attribute “usemap” must not appear as a descendant of the “a” element.
Attribute “name” not allowed on element “div” at this point.
Attribute “about” not allowed on element “span” at this point.
Attribute “datatype” not allowed on element “span” at this point.
The “center” element is obsolete. Use CSS instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
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