Aok-bv.de W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “banner” role is unnecessary for element “header”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “navigation” role is unnecessary for element “nav”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
Empty heading.
The “contentinfo” role is unnecessary for element “footer”.
Attribute “"” is not serializable as XML 1.0.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
This document appears to be written in German. Consider adding “lang="de"” (or variant) to the “html” start tag.
Errors:
Bad value “”og:title”” for attribute “property” on element “meta”: The string “”og:title”” is not an absolute URL.
Bad value “”og:description”” for attribute “property” on element “meta”: The string “”og:description”” is not an absolute URL.
Bad value “”og:image”” for attribute “property” on element “meta”: The string “”og:image”” is not an absolute URL.
No “li” element in scope but a “li” end tag seen.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Saw “"” when expecting an attribute name. Probable cause: “=” missing immediately before.
Attribute “"” not allowed on element “a” at this point.
Germany DE