Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Element “meta” is missing one or more of the following attributes: “charset”, “content”, “http-equiv”, “itemprop”, “name”, “property”.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Attribute “alt” not allowed on element “a” at this point.
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “li” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Bad value “100%” for attribute “width” on element “video”: Expected a digit but saw “%” instead.
Bad value “true” for attribute “loop” on element “video”.
Bad value “true” for attribute “autoplay” on element “video”.
Element “a” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Bad value “” for attribute “target” on element “a”: Browsing context name must be at least one character long.
Duplicate ID “Ebene_1”.
Duplicate ID “SVGID_1_”.
Duplicate ID “SVGID_2_”.
Duplicate ID “SVGID_3_”.
Duplicate ID “SVGID_4_”.
Duplicate ID “SVGID_5_”.
Duplicate ID “SVGID_6_”.
Duplicate ID “SVGID_7_”.
Duplicate ID “SVGID_8_”.
The “aria-controls” attribute must point to an element in the same document.
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “Ebene_1” was here.
The first occurrence of ID “SVGID_1_” was here.
The first occurrence of ID “SVGID_2_” was here.
The first occurrence of ID “SVGID_3_” was here.
The first occurrence of ID “SVGID_4_” was here.
The first occurrence of ID “SVGID_5_” was here.
The first occurrence of ID “SVGID_6_” was here.
The first occurrence of ID “SVGID_7_” was here.
The first occurrence of ID “SVGID_8_” was here.
Empty heading.
This document appears to be written in German. Consider adding “lang="de"” (or variant) to the “html” start tag.
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