This is big news—it means developers now have more control over Google Fonts web font loading behavior. We can enforce instant rendering of fallback text (when using font-display: swap) rather than relying on the browser default behavior of invisible text for up to 3 seconds while the web font request is in-flight.
It’s also a bit of trailblazing, too. To my knowledge, this is the first web font host that’s shipping support for this very important font-display feature.
Oh and this is a good time to remind everyone of Monica Dinculescu’s font-display demo where she explores all the various font-display values and how they work in practice. It’s super nifty and worth checking out.