Mdislander.com 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.
Bad value “Cache-Control” for attribute “http-equiv” on element “meta”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
End tag “header” seen, but there were open elements.
Unclosed element “div”.
Duplicate ID “s”.
Start tag “a” seen but an element of the same type was already open.
Stray end tag “a”.
No “p” element in scope but a “p” end tag seen.
Stray start tag “a”.
Duplicate ID “banner-ad”.
The “center” element is obsolete. Use CSS instead.
Warnings:
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “s” was here.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “banner-ad” was here.
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