Sgu.edu.vn 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.
Attribute “retina_logo_url” not allowed on element “img” at this point.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Bad value “(min-width: 2200px) 100vw, (min-width: 640px) 1100px, ” for attribute “sizes” on element “img”: Empty source size at “…in-width: 640px) 1100px, ”.
Element “p” not allowed as child of element “h2” in this context. (Suppressing further errors from this subtree.)
No “p” element in scope but a “p” end tag seen.
End tag “br”.
Malformed byte sequence: “ff”.
Malformed byte sequence: “8a”.
Warnings:
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
The “main” role is unnecessary for element “main”.
The “contentinfo” role is unnecessary for element “footer”.
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