https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6fvar.html describes how AAT fonts are interoperable: Tag | Name | Default | Description -- | -- | -- | -- 'wght' | Weight | 1.0 | Used for making a font range from light to black. 'wdth' | Width | 1.0 | Used for fonts ranging from narrow to wide. 'slnt' | Slant | 0.0 | Specifies the angle (in degrees) of italic slant. 'opsz' | Optical Size | 12.0 | Specifies the optical point size. -- GitHub Notification of comment by litherum Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/1531#issuecomment-351316915 using your GitHub accountReceived on Wednesday, 13 December 2017 08:19:26 UTC
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