@stefan @HTeuMeuLeu the `quote` parameter car also be handy to add non-breaking spaces, for instance in French:

[lang=fr] {
/* « » « » (non-breaking spaces added) */
--q-quotes: '\00ab\202F' '\202F\00bb' '\00ab\202F' '\202F\00bb';
}
q {
quotes: var(--q-quotes);
}
q::before {
content: open-quote;
}
q::after {
content: close-quote;
}

Also, there is quite a list there https://github.com/jensimmons/cssremedy/blob/master/css/quotes.css

#typonerd