https://github.com/harfbuzz/harfbuzz/issues/3688#issuecomment-1169120122 https://docs.microsoft.com/en-us/typography/ https://docs.microsoft.com/en-us/typography/opentype/spec/math https://docs.microsoft.com/en-us/typography/opentype/spec/gdef
harfbuzz/harfbuzz#3688 (comment)
https://docs.microsoft.com/en-us/typography/
https://docs.microsoft.com/en-us/typography/opentype/spec/math
https://docs.microsoft.com/en-us/typography/opentype/spec/gdef