Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Empty heading.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
This document appears to be written in German but the “html” start tag has “lang="en-US"”. Consider using “lang="de"” (or variant) instead.
Errors:
Bad value “auto” for attribute “width” on element “video”: Expected a digit but saw “a” instead.
Bad value “auto” for attribute “height” on element “video”: Expected a digit but saw “a” instead.
Bad value “(max-device-width: 480px)” for attribute “media” on element “source”: Expected a CSS media feature but saw “max-device-width” instead.
Bad value “(max-device-width: 768px)” for attribute “media” on element “source”: Expected a CSS media feature but saw “max-device-width” instead.
Bad value “(max-device-width: 1280px)” for attribute “media” on element “source”: Expected a CSS media feature but saw “max-device-width” instead.
Bad value “auto” for attribute “width” on element “iframe”: Expected a digit but saw “a” instead.
Bad value “auto” for attribute “height” on element “iframe”: Expected a digit but saw “a” instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “_blank ” for attribute “target” on element “a”: Reserved keyword “blank ” used.
Bad value “_top ” for attribute “target” on element “a”: Reserved keyword “top ” used.
End tag “div” seen, but there were open elements.
Unclosed element “section”.
Stray end tag “section”.
The “select” element cannot have more than one selected “option” descendant unless the “multiple” attribute is specified.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
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