Ntdtv.ru W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Duplicate attribute “prefix”.
Bad value “https://www.w3.org/1999/xhtml” for the attribute “xmlns” (only “http://www.w3.org/1999/xhtml” permitted here).
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Element “script” must not have attribute “async” unless attribute “src” is also specified.
End tag “div” seen, but there were open elements.
Unclosed element “span”.
No space between attributes.
Attribute “rel” not allowed on element “div” at this point.
No “p” element in scope but a “p” end tag seen.
Duplicate ID “link_front_page”.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
Attribute “xmlns” is not serializable as XML 1.0.
Empty heading.
The first occurrence of ID “link_front_page” was here.
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