> In a fact I'm looking for such solution that is compatible with my
> existing projects - I don't want to create new commands and
> environments. Is it possible?
Yes. The general solution for this kind of problem is to save the
original meaning of the macro using \let, and to reuse it later, such
as in:
\let\originalfootnote\footnote
\renewcommand\footnote[1]{\originalfootnote{%
\addfontfeature{Color=666666}%
#1}}
I didn't test this definition, but it gives you the gist: \let
declares that the macro \originalfootnote has the meaning of \footnote
at that precise moment (and won't change if \footnote changes), then
\renewcommand redefines \footnote using its original meaning.
Arthur
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