Oberlin.edu W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “ImageToolbar” for attribute “http-equiv” on element “meta”.
Attribute “sticky” not allowed on element “header” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “type” not allowed on element “div” at this point.
Duplicate attribute “muted”.
Bad value “true” for attribute “muted” on element “video”.
Duplicate attribute “class”.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
No “p” element in scope but a “p” end tag seen.
Element “ul” not allowed as child of element “h2” in this context. (Suppressing further errors from this subtree.)
End tag “article” seen, but there were open elements.
Unclosed element “div”.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
The “aria-controls” attribute must point to an element in the same document.
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
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