Thenakedscientists.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Duplicate attribute “class”.
Bad value “” for attribute “name” on element “button”: Must not be empty.
End tag “div” seen, but there were open elements.
Unclosed element “nav”.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
The “align” attribute on the “div” element is obsolete. Use CSS instead.
No “p” element in scope but a “p” end tag seen.
Warnings:
The “banner” role is unnecessary for element “header”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “navigation” role is unnecessary for element “nav”.
The “button” role is unnecessary for element “button”.
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