news.gitea.happylizard.me/bin/gems/kramdown-2.5.1/test/testcases/span/extension/comment.html

<p>This is a <!-- simple --> paragraph.
This is a <!-- simple --> paragraph.
This is a <!-- simple {:/other} paragraph -->.
This is a  paragraph.
This is a {:/comment} simple {:/} paragraph.
This is a {::comment} paragraph.</p>