`xmp` tag is obsolete

[NetzwergX]

c.f. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/xmp

Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

Another element like pre or code could and should be used instead of xmp.