Cooley.edu W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A document must not include more than one “meta” element with a “charset” attribute.
Bad value “revision” for attribute “rel” on element “link”: The string “revision” is not a registered keyword.
Text not allowed in element “iframe” in this context.
An element with “role=menuitem” must be contained in, or owned by, an element with “role=menubar” or “role=menu”.
Duplicate attribute “data-orbit”.
Element “button” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “figcaption” not allowed as child of element “li” in this context. (Suppressing further errors from this subtree.)
Attribute “about” not allowed on element “article” at this point.
Attribute “content” not allowed on element “span” at this point.
Element “a” is missing one or more of the following attributes: “aria-checked”, “role”.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Warnings:
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “article” role is unnecessary for element “article”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
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