Meilenoptimieren.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Element “meta” is missing one or more of the following attributes: “charset”, “content”, “http-equiv”, “itemprop”, “name”, “property”.
Attribute “pagespeed_no_defer” not allowed on element “script” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “mc4wp_email”.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The first occurrence of ID “mc4wp_email” was here.
This document appears to be written in German but the “html” start tag has “lang="en-US"”. Consider using “lang="de"” (or variant) instead.
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