Theeditorsblog.net W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
The “profile” attribute on the “head” element is obsolete.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 “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Bad value “website” for attribute “itemtype” on element “meta”: The string “website” is not an absolute URL.
Element “meta” is missing one or more of the following attributes: “content”, “itemprop”, “name”.
The “font” element is obsolete. Use CSS instead.
The “center” element is obsolete. Use CSS instead.
No “p” element in scope but a “p” end tag seen.
The “itemprop” attribute was specified, but the element is not a property of any item.
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