Historyofmassachusetts.org 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.
Duplicate ID “s”.
Duplicate ID “mc4wp_email”.
Bad value “”nofollow”” for attribute “rel” on element “a”: The string “”nofollow”” is not a registered keyword.
Warnings:
The “banner” role is unnecessary for element “header”.
The first occurrence of ID “s” was here.
The “navigation” role is unnecessary for element “nav”.
Empty heading.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
Attribute “aria-required” is unnecessary for elements that have attribute “required”.
The first occurrence of ID “mc4wp_email” was here.
The “contentinfo” role is unnecessary for element “footer”.
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