Markdown - can't use <summary> element

Hi.
does anyone know please how to use <Details> and <summary> in markdown tab? Unfortunately, the text in “summary” does not show me. Thank you.
The result is:

sumary

Yes that tag is currently not in the allowed list for the HA frontend. I have raised a request in the upstream library that we use in the HA frontend. Otherwise, we might perhaps add it explicitly in the HA frontend.

Hi. Thank you for the quick and positive response!