Errors:
Duplicate attribute “lang”.
Attribute “xmlns:f” not allowed here.
Element “figcaption” not allowed as child of element “a” in this context. (Suppressing further errors from this subtree.)
Bad value “https://lehreronline.adspirit.de/adscript.php?pid=7&ord=[timestamp]” for attribute “src” on element “script”: Illegal character in query: “[” is not allowed.
Bad value “https://lehreronline.adspirit.de/adnoclick.php?pid=7&ord=[timestamp]” for attribute “href” on element “a”: Illegal character in query: “[” is not allowed.
Bad value “https://lehreronline.adspirit.de/adnoscript.php?pid=7&ord=[timestamp]” for attribute “src” on element “img”: Illegal character in query: “[” is not allowed.
Attribute “noresize” not allowed on element “iframe” at this point.
Bad value “https://lehreronline.adspirit.de/adframe.php?pid=1&ord=[timestamp]” for attribute “src” on element “iframe”: Illegal character in query: “[” is not allowed.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “marginheight” attribute on the “iframe” element is obsolete. Use CSS instead.
The “marginwidth” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
Text not allowed in element “iframe” in this context.
Bad value “190px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Warnings:
Attribute with the local name “xmlns:f” is not serializable as XML 1.0.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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