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Hamid,Idris schrieb am 19.08.2023 um 20:36:

Many thanks. From font-pre.mkiv:

\definealternativestyle [\v!smallcaps] [\setsmallcaps] [\setsmallcaps]
:
\unexpanded\def\setsmallcaps{\doaddfeature{f:smallcaps}}

So on the wiki we should say that \sc is a deprecated/legacy command
that no longer makes sense in an opentype-features world. New users
should no longer use it.

It depends on the font, e.g. Latin Modern still requires \sc because it
provides a separate file for smallcaps but no smcp feature.

ConTeXt has a command which can be used to check whether the current
active font provides the smcp feature but the recommended way is to
choose a font which supports to method (\sc or \setsmallcaps) which is
used in the document.