Errors:
Bad value “Cache-control” for attribute “http-equiv” on element “meta”.
Bad value “Pragma” for attribute “http-equiv” on element “meta”.
Bad value “Expires” for attribute “http-equiv” on element “meta”.
Bad value “screen and (max-device-width: 800px)” for attribute “media” on element “link”: Deprecated media feature “max-device-width”. For guidance, see the Deprecated Media Features section in the current Media Queries specification.
Bad value “72×72” for attribute “sizes” on element “link”.
Bad value “114×114” for attribute “sizes” on element “link”.
Stray end tag “head”.
Start tag “body” seen but an element of the same type was already open.
Bad value “” for attribute “action” on element “form”: Must be non-empty.
No “p” element in scope but a “p” end tag seen.
The “align” attribute on the “input” element is obsolete. Use CSS instead.
Named character reference was not terminated by a semicolon. (Or “&” should have been escaped as “&”.)
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Stray end tag “a”.
Bad element name “fb:login-button”: Code point “U+003A” is not allowed
End tag “div” seen, but there were open elements.
Unclosed element “span”.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Element name “fb:login-button” cannot be represented as XML 1.0.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
This document appears to be written in German. Consider adding “lang="de"” (or variant) to the “html” start tag.
Switzerland CH