Icivics.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “xmlns:fb” not allowed here.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Attribute “http-equiv” not allowed on element “link” at this point.
Attribute “content” not allowed on element “link” at this point.
Element “link” is missing one or more of the following attributes: “href”, “itemprop”, “property”, “rel”.
Bad value “//” for attribute “href” on element “link”: Invalid host: empty host.
Stray doctype.
Bad value “true” for attribute “async” on element “script”.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
Attribute with the local name “xmlns:fb” is not serializable as XML 1.0.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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