Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
The “border” attribute on the “table” element is obsolete. Use CSS instead.
The element “a” must not appear as a descendant of the “a” element.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Named character reference was not terminated by a semicolon. (Or “&” should have been escaped as “&”.)
End tag “li” seen, but there were open elements.
Unclosed element “span”.
No “p” element in scope but a “p” end tag seen.
End tag “div” seen, but there were open elements.
Unclosed element “section”.
End tag “article” seen, but there were open elements.
Unclosed element “div”.
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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).
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
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