Errors:
The element “button” must not appear as a descendant of the “a” element.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Attribute “subtitle” not allowed on element “a” at this point.
Attribute “description” not allowed on element “a” at this point.
Attribute “image” not allowed on element “a” at this point.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value for attribute “srcset” on element “source”: Width for image “/fileadmin/_processed_/a/…opy-kwothe_463b08d573.jpg” is identical to width for image “/fileadmin/_processed_/a/…opy-kwothe_463b08d573.jpg”.
When the “srcset” attribute has any image candidate string with a width descriptor, the “sizes” attribute must also be present.
Bad value “” for attribute “longdesc” on element “img”: Must be non-empty.
The “longdesc” attribute on the “img” element is obsolete. Use a regular “a” element to link to the description.
Bad value for attribute “srcset” on element “source”: Width for image “/fileadmin/_processed_/a/…arayaku-js_c4df29a372.jpg” is identical to width for image “/fileadmin/_processed_/a/…arayaku-js_c4df29a372.jpg”.
Bad value for attribute “srcset” on element “source”: Width for image “/fileadmin/_processed_/1/…r-urkunden_dc25800b78.jpg” is identical to width for image “/fileadmin/_processed_/1/…r-urkunden_dc25800b78.jpg”.
Bad value for attribute “srcset” on element “source”: Width for image “/fileadmin/_processed_/1/…eziscomix2_0ee392d174.jpg” is identical to width for image “/fileadmin/_processed_/1/…eziscomix2_0ee392d174.jpg”.
Bad value for attribute “srcset” on element “source”: Width for image “/fileadmin/_processed_/c/…nduras-mc1_2c4fb5b181.jpg” is identical to width for image “/fileadmin/_processed_/c/…nduras-mc1_2c4fb5b181.jpg”.
Bad value for attribute “srcset” on element “source”: Width for image “/fileadmin/user_upload/Bi…gua-rbsm-austausch-tk.jpg” is identical to width for image “/fileadmin/user_upload/Bi…gua-rbsm-austausch-tk.jpg”.
Bad value for attribute “srcset” on element “source”: Width for image “/fileadmin/user_upload/Bi…Bergregenwald-380x260.jpg” is identical to width for image “/fileadmin/user_upload/Bi…Bergregenwald-380x260.jpg”.
Bad value for attribute “srcset” on element “source”: Width for image “/fileadmin/_processed_/f/…-skynesher_1530661e34.jpg” is identical to width for image “/fileadmin/_processed_/f/…-skynesher_1530661e34.jpg”.
Bad value for attribute “srcset” on element “source”: Width for image “/fileadmin/user_upload/Bi…eite/bildungsprojekte.jpg” is identical to width for image “/fileadmin/user_upload/Bi…eite/bildungsprojekte.jpg”.
Start tag “a” seen but an element of the same type was already open.
End tag “a” violates nesting rules.
Cannot recover after last error. Any further errors will be ignored.
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