Posted by Alexander Schwartz on
URL: https://discuss.asciidoctor.org/How-do-you-embed-marks-and-custom-syslings-to-each-other-tp7816p7820.html

You can nest the outer formatting inside the inner formatting by using double-hash on the outside and single-hash on the inside.

The following worked for me. I put it into separate lines for improved readability, but it still works when you put everything in one line.

This is normal sized text.
[.small]##This is small text.
[.underline]#However this part must be small and underlined#
##

This utilizes the constrained/unconstrained formatting as described in the user manual: https://asciidoctor.org/docs/user-manual/#constrained-quotes

Regards, Alexander