Intentblog.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.
Attribute “href” not allowed on element “button” at this point.
Duplicate ID “content”.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Bad character “<” after “<”. Probable cause: Unescaped “<”. Try escaping it as “<”.
Bad character “ ” after “<”. Probable cause: Unescaped “<”. Try escaping it as “<”.
End tag “footer” seen, but there were open elements.
Unclosed element “div”.
Stray end tag “div”.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “content” was here.
The “main” role is unnecessary for element “main”.
The “complementary” role is unnecessary for element “aside”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The “contentinfo” role is unnecessary for element “footer”.
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