Complexityexplorer.org W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
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.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
Errors:
No “p” element in scope but a “p” end tag seen.
Element “a” not allowed as child of element “dl” in this context. (Suppressing further errors from this subtree.)
Element “a” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Element “div” is missing a required instance of child element “dd”.
Element “div” is missing a required instance of child element “dt”.
Element “div” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Element “dfn” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
The element “h3” must not appear as a descendant of the “dt” element.
Start tag “a” seen but an element of the same type was already open.
End tag “a” violates nesting rules.
Stray end tag “a”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
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