Message-business.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
The “center” element is obsolete. Use CSS instead.
End tag “center” seen, but there were open elements.
Unclosed element “div”.
End tag “div” seen, but there were open elements.
Unclosed element “article”.
Unclosed element “main”.
Element “button” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
No “p” element in scope but a “p” end tag seen.
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Stray end tag “article”.
Stray end tag “main”.
Stray end tag “div”.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
The “contentinfo” role is unnecessary for element “footer”.
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).
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