Historymuseum.ca 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.
Element “span” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Attribute “js-href-switch” not allowed on element “a” at this point.
The element “main” must not appear as a descendant of the “footer” element.
Duplicate ID “twitter”.
Duplicate ID “facebook”.
The element “footer” must not appear as a descendant of the “footer” element.
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “twitter” was here.
The first occurrence of ID “facebook” was here.
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