the formality slider (play with it at the google fonts page linked in the article[0]) is genuinely one of the coolest uses of a variable font axis i've seen in recent memory. it feels like we're witnessing the slow and steady vindication of metafont.
That’s the coolest thing!And “bounce” slider. What a time to be alive… I wonder if there are more fonts like that with special adjustments. Still waiting for technology to allow handwritten font with true randomness.
I'm not familiar with Metafont -- is this what you're referencing? https://ctan.org/pkg/metafont?lang=en
Wait, does more informality mean that individual glyphs for the same character can be different even within the same sentence?
Typotheque’s Dash has a very similar variable axis, though they call it ‘Speed’: https://www.typotheque.com/fonts/dash-casual. (For some reason you need to click on the ‘Variable’ box in order to see the full variable range.)