Errors:
Attribute “xmlns:og” not allowed here.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
A “charset” attribute on a “meta” element found after the first 1024 bytes.
Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.
The text content of element “script” was not in the required format: Expected space, tab, newline, or slash but found “{” instead.
Bad value “” for attribute “target” on element “a”: Browsing context name must be at least one character long.
The “center” element is obsolete. Use CSS instead.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Warnings:
Attribute with the local name “xmlns:og” is not serializable as XML 1.0.
The “main” role is unnecessary for element “main”.
Empty heading.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “contentinfo” role is unnecessary for element “footer”.
This document appears to be written in English but the “html” start tag has “lang="nl"”. Consider using “lang="en"” (or variant) instead.
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