Omegafi.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.
The “center” element is obsolete. Use CSS instead.
End tag “div” seen, but there were open elements.
Unclosed element “center”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “cs-content”.
Warnings:
The “banner” role is unnecessary for element “header”.
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”.
Empty heading.
The “contentinfo” role is unnecessary for element “footer”.
The first occurrence of ID “cs-content” was here.
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).
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