Whyy.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.
Element “div” is missing one or more of the following attributes: “role”.
Duplicate attribute “id”.
No space between attributes.
Element “p” not allowed as child of element “h2” in this context. (Suppressing further errors from this subtree.)
Bad value “tel:+1 (215) 351-1200” for attribute “href” on element “a”: Illegal character in scheme data: space is not allowed.
Bad value “tel:+1 (302) 888-1200” for attribute “href” on element “a”: Illegal character in scheme data: space is not allowed.
The “for” attribute of the “label” element must refer to a non-hidden form control.
The “aria-controls” attribute must point to an element in the same document.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
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).
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.
The “contentinfo” role is unnecessary for element “footer”.
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