A New Way To Reduce Font Loading Impact: CSS Font Descriptors
https://www.smashingmagazine.comWeb fonts are often terrible for web performance and none of the font loading strategies are particularly effective to address that. Upcoming font options may finally deliver on the promise of making it easier to align fallback fonts to the final fonts.
CSS “size-adjust” descriptor for fonts: reduce layout shifts by matching up a fallback font and primary web font through a scale factor for glyphs (percentage).