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@tabatkins @davidbaron @PixelAmbacht @mnot @jfkthame @font Yes—grouped repaints to reduce reflow is the big thing! Your sample code there would requiring changing the font matching algorithm. Browser requests Roman font-face and ignores Roman-super-subset there, yes? w3.org/TR/css-fonts-4/#font-style-matching Also, better to tie into @font-feature-values?