Htmlreference.io W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
The element “footer” must not appear as a descendant of the “header” element.
Attribute “xmlns:rdf” not allowed here.
Attribute “xmlns:cc” not allowed here.
Attribute “xmlns:dc” not allowed here.
Element “script” must not have attribute “async” unless attribute “src” is also specified.
Element “style” not allowed as child of element “noscript” in this context. (Suppressing further errors from this subtree.)
Warnings:
Attribute with the local name “xmlns:rdf” is not serializable as XML 1.0.
Attribute with the local name “xmlns:cc” is not serializable as XML 1.0.
Attribute with the local name “xmlns:dc” is not serializable as XML 1.0.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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