Cksen.cz W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “cz” for attribute “lang” on element “html”: The language subtag “cz” is not a valid ISO language part of a language tag.
Duplicate ID “wm_search”.
Bad value “” for attribute “action” on element “form”: Must be non-empty.
Duplicate ID “required_field”.
No space between attributes.
Element “sna” not allowed as child of element “a” in this context. (Suppressing further errors from this subtree.)
Stray end tag “span”.
End tag “a” violates nesting rules.
Bad value “screen,projection” for attribute “media” on element “link”: Deprecated media type “projection”. For guidance, see the Media Types section in the current Media Queries specification.
Warnings:
Empty heading.
The first occurrence of ID “wm_search” was here.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The first occurrence of ID “required_field” was here.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
This document appears to be written in Czech but the “html” start tag has “lang="cz"”. Consider using “lang="cs"” (or variant) instead.
Czech Republic CZ