The wiki code:
{{wiki:dokuwiki-128.png?20}} ...
The result is or should be displayed between the horizontal lines:
(Now with a patch corresponding to https://github.com/splitbrain/dokuwiki/pull/2420/files)
https://forum.dokuwiki.org/post/63342
https://github.com/splitbrain/dokuwiki/issues/2474#issuecomment-432961717