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Some helpful additions have been made to the OpenType spec regarding Optical Size (opsz): docs.microsoft.com/en-us/typography/opentype/spec/dvaraxistag_opsz opsz can be complicated, but I’m glad this addresses some issues regarding physical size, viewing distance, min/max value clamping, zooming, & overriding auto values
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…in reply to @cjtype
Hopefully this will encourage app makers to support the opsz axis in a more consistent and logical way. Louvette, for example, has an optical size axis and I hope to see it get more use as app support improves. More info here: cjtype.com/typefaces/louvette/#variable_axes