Howtocrazy.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Duplicate attribute “prefix”.
Bad value “x-dns-prefetch-control” for attribute “http-equiv” on element “meta”.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
A document must not include more than one “meta” element with its “name” attribute set to the value “description”.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
The element “a” must not appear as a descendant of the “button” element.
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