Messagemedia.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “Cache-Control” for attribute “http-equiv” on element “meta”.
Bad value “Pragma” for attribute “http-equiv” on element “meta”.
Bad value “Expires” for attribute “http-equiv” on element “meta”.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Bad value “en-uk” for attribute “hreflang” on element “link”: Bad region subtag.
Bad start tag in “iframe” in “head”.
Bad value “//www.googletagmanager.com/ns.html?id=GTM-PVVCRV>” for attribute “src” on element “iframe”: Illegal character in query: “>” is not allowed.
Stray end tag “noscript”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Stray end tag “head”.
Start tag “body” seen but an element of the same type was already open.
Cannot recover after last error. Any further errors will be ignored.
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