As for using a fallback font that closely matches to minimize the impact of the switch over, how realistic is that? It would a lot more realistic if browsers o

As for using a fallback font that closely matches to minimize the impact of the switch over, how realistic is that? It would a lot more realistic if browsers other than Firefox supported font-size-adjust, which allows the fallback font to mimic the metrics of your primary font. Here's an article from 2010 that describes how it works: https://webdesignernotebook.com/css/the-little-known-font-size-adjust-css3-property/ https://webdesignernotebook.com/css/the-little-known-font-si...