Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Errors:
Attribute “about” not allowed on element “article” at this point.
Attribute “content” not allowed on element “span” at this point.
Attribute “datatype” not allowed on element “span” at this point.
The “font” element is obsolete. Use CSS instead.
Duplicate attribute “class”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
No “p” element in scope but a “p” end tag seen.
Bad value “1” for attribute “allowfullscreen” on element “iframe”.
Bad value “https://www.youtube.com/embed/LRChVAl9EKg?enablejsapi=1&wmode=opaque"” for attribute “src” on element “iframe”: Illegal character in query: “"” is not allowed.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
End tag “h2” seen, but there were open elements.
End tag “div” seen, but there were open elements.
Unclosed element “section”.
Stray end tag “section”.
Element “style” not allowed as child of element “section” in this context. (Suppressing further errors from this subtree.)
Stray end tag “div”.
The “aria-labelledby” attribute must point to an element in the same document.
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