While the GSUB spec says:

A Multiple Substitution (MultipleSubst) subtable replaces a single glyph with more than one glyph

all shapers currently support a substitution rule which deletes a glyph, and Microsoft's own fonts rely on this behaviour.

Document Details

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• ID: 34e7df21-eb35-19ab-3573-e075872e5d3b
• Version Independent ID: 4656a3f9-95ea-15cc-25ed-6eccf7adf370
• Content: GSUB — Glyph Substitution Table - Typography
• Content Source: typographydocs/opentype/spec/gsub.md
• Product: typography
• Microsoft Alias: alib