Nmma.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “header” for attribute “role” on element “header”.
Element “p” not allowed as child of element “h3” in this context. (Suppressing further errors from this subtree.)
No space between attributes.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “webkitallowfullscreen” not allowed on element “iframe” at this point.
Attribute “mozallowfullscreen” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The element “button” must not appear as a descendant of the “a” element.
Saw “"” when expecting an attribute name. Probable cause: “=” missing immediately before.
Attribute “"” not allowed on element “a” at this point.
The “for” attribute of the “label” element must refer to a non-hidden form control.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “contentinfo” role is unnecessary for element “footer”.
Attribute “"” is not serializable as XML 1.0.
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