Bluhmsysteme.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://www.googletagmanager.com/ns.html?id= GTM-N8SJNR” for attribute “src” on element “iframe”: Illegal character in query: space is not allowed.
Attribute “alt” not allowed on element “a” at this point.
The “center” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “p” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
End tag “div” seen, but there were open elements.
Unclosed element “span”.
Warnings:
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
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