Thread: "Variable Fonts" supported in epub?
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Old 10-17-2018, 10:42 AM   #3
jhowell
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The EPUB 3 Core Media Types specification calls out the following specification for OpenType:

ISO/IEC 14496-22:2009 - Information technology -- Coding of audio-visual objects -- Part 22: Open Font Format.

This is the ISO's version of the OpenType specification from 2009. It significantly pre-dates font variations that were introduced in Microsoft's OpenType version 1.8 in 2016.

I would say that embedding a font in an EPUB that does not comply with the 2009 specification would result in a non-compliant EPUB. It might be handled by some e-readers, but certainly not by all.
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