Knomad.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “revision” for attribute “rel” on element “link”: The string “revision” is not a registered keyword.
Bad value “” for attribute “name” on element “button”: Must not be empty.
Bad value “http://www.w3.org/1999/html” for the attribute “xmlns” (only “http://www.w3.org/1999/xhtml” permitted here).
Duplicate attribute “id”.
Duplicate attribute “class”.
Duplicate ID “block-exposedforminventory-of-toolspage-1”.
CSS: “mail-subscription”: Parse Error.
CSS: “wrap-subscribe-button”: Parse Error.
Warnings:
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Attribute “xmlns” is not serializable as XML 1.0.
The “article” role is unnecessary for element “article”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “contentinfo” role is unnecessary for element “footer”.
The first occurrence of ID “block-exposedforminventory-of-toolspage-1” was here.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
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