Burshaberleri.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.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
End tag “div” seen, but there were open elements.
Unclosed element “span”.
The “center” element is obsolete. Use CSS instead.
Unclosed element “center”.
Stray end tag “center”.
Heading cannot be a child of another heading.
End tag “center” seen, but there were open elements.
Unclosed element “h4”.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
Empty heading.
The “contentinfo” role is unnecessary for element “footer”.
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