[csswg-drafts] [css-fonts] Pseudo-generic font families (#5065)

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

== [css-fonts] Pseudo-generic font families ==
Several actual (Western) typeface names are sometimes used generically, in that there are either metrically compatible clones (with more liberal licenses) or multiple digitizations of the same lead-era typeface. 

Should implementations explicitly be allowed to treat them more like keywords in `<'font-family'>` if they are not quoted, i.e. choose an alternative font that is available? 

This would primarily affect the set of Microsoftʼs [Core fonts for the Web](https://en.wikipedia.org/wiki/Core_fonts_for_the_Web), which also contain the de facto standard mappings for the generic font families `serif` (_Times_ or _Times New Roman_), `sans-serif` (_Arial_) and `monospace` (_Courier_ or _Courier New_). 

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5065 using your GitHub account