Digitallumens.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.
No space between attributes.
Duplicate ID “icon-secure”.
Duplicate ID “icon-area”.
End tag “footer” seen, but there were open elements.
Unclosed element “div”.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Warnings:
The first occurrence of ID “icon-secure” was here.
The first occurrence of ID “icon-area” was here.
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
Empty heading.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “button” role is unnecessary for element “button”.
The “contentinfo” role is unnecessary for element “footer”.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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