Pidruchniki.in.ua W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The “banner” role is unnecessary for element “header”.
Attribute “...” is not serializable as XML 1.0.
The “navigation” role is unnecessary for element “nav”.
The “contentinfo” role is unnecessary for element “footer”.
This document appears to be written in Ukrainian but the “html” start tag has “lang="ru-RU"”. Consider using “lang="uk"” (or variant) instead.
Errors:
Element “a” not allowed as child of element “hgroup” in this context. (Suppressing further errors from this subtree.)
Element “br” not allowed as child of element “hgroup” in this context. (Suppressing further errors from this subtree.)
Element “hgroup” is missing a required instance of one or more of the following child elements: “h1”, “h2”, “h3”, “h4”, “h5”, “h6”.
Element “noindex” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Ukraine UA