Fourfourtwo.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
The “profile” attribute on the “head” element is obsolete. To declare which “meta” terms are used in the document, instead register the names as meta extensions. To trigger specific UA behaviors, use a “link” element instead.
Bad value “x-dns-prefetch-control” for attribute “http-equiv” on element “meta”.
Bad value “gr-GR” for attribute “hreflang” on element “link”: The language subtag “gr” is not a valid ISO language part of a language tag.
Bad value “cleartype” for attribute “http-equiv” on element “meta”.
Attribute “pw:url” not allowed on element “div” at this point.
Attribute “pw:twitter-via” not allowed on element “div” at this point.
Element “source” is missing required attribute “srcset”.
Warnings:
The “type” attribute is unnecessary for JavaScript resources.
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
Attribute “pw:url” is not serializable as XML 1.0.
Attribute “pw:twitter-via” is not serializable as XML 1.0.
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