My-mooc.com W3C HTML Markup Validation
HTML markup errors and warnings
(Rescan now...)
Errors:
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Attribute “xmlns:schema” not allowed here.
Attribute “about” not allowed on element “div” at this point.
Element “img” is missing required attribute “src”.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Attribute “about” not allowed on element “section” at this point.
Bad value “” for attribute “name” on element “input”: Must not be empty.
Attribute “required” not allowed on element “button” at this point.
Stray end tag “div”.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
Attribute with the local name “xmlns:schema” is not serializable as XML 1.0.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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