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font-stretchto 60%. Now I'm testing using DJR's Fit, which can most certainly compress to 60% of normal and even less, but with
font-stretchset to 60%, it still occupies 145 points - the actual compression is 70%.
wdth"axis: Fit has a "skyline" named instance which has a
wdthof 0, but it clearly has some width, while its "ultra extended" instance with
wdth1000 is somewhat less than 10 times wider than the regular (which itself has wdth 110!). So the font-stretch property really has no hope of getting it right.
font-variation-settings: 'wdth' (whatever the minimum is)and measure it, then at
font-variation-settings: 'wdth' (whatever the maximum is)and measure that, and interpolate between the two. But I'm not even sure how to get the minimum and maximum values from the font in a browser. Any ideas?