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Originally Posted by Hitch
So, yes: a glyph I cannot find, at all, in FontForge, works in an ePUB, even though some other glyph, that is not the glyph I seek, was called and it/they work---even though the font was subset, which means that the glyphs oughtn't be there at all.
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It depends on what the tool doing the subsetting actually did. Some tools may keep only the plain letters, some tools may keep also the possible variants, some tools may keep all variants, ligatures, etc. (even if they involve only removed letters), because they cannot/will not figure out if they're needed or not.
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Nor can I see or find any aalt (per Doits' comments) to show me "all" the alternatives. (I wonder if that's only alts with hex or code points?)
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What exactly are the different features present in a font, and what they actually do is up to the font designer. The names are only orientative/conventional.