[csswg-drafts] [css-fonts-4] Add font-synthesis descriptor to @font-face rules? (#6081)

MatsPalmgren has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-fonts-4] Add font-synthesis descriptor to @font-face rules? ==
https://drafts.csswg.org/css-fonts-4/#font-face-rule
I think `font-synthesis` would be useful to support in `@font-face` rules.  For example, when you have font that is intended to display emoji or list item `::marker`s and such where synthesizing it would look ugly.

CC @jfkthame 

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/6081 using your GitHub account


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