Middleschoolscience.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The “navigation” role is unnecessary for element “nav”.
The “banner” role is unnecessary for element “header”.
The “main” role is unnecessary for element “main”.
The first occurrence of ID “jp-post-flair” was here.
The “contentinfo” role is unnecessary for element “footer”.
The first occurrence of ID “_wpnonce” was here.
Errors:
Duplicate attribute “rel”.
Attribute “type” not allowed on element “iframe” at this point.
Bad value “true” for attribute “allowfullscreen” on element “iframe”.
Duplicate ID “jp-post-flair”.
Duplicate ID “_wpnonce”.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “aria-controls” attribute must point to an element in the same document.
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