Thehappyscientist.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “article” role is unnecessary for element “article”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The first occurrence of ID “join” 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).
Errors:
Bad value “100%” for attribute “width” on element “img”: Expected a digit but saw “%” instead.
Element “ul” not allowed as child of element “h4” in this context. (Suppressing further errors from this subtree.)
Attribute “about” not allowed on element “article” at this point.
Stray end tag “header”.
Attribute “content” not allowed on element “span” at this point.
Bad value “form” for attribute “role” on element “section”.
The “center” element is obsolete. Use CSS instead.
No “p” element in scope but a “p” end tag seen.
Duplicate ID “join”.
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