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clarify that color emoji fonts cannot be used with Asciidoctor PDF
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@mojavelinux
mojavelinux committed Sep 17, 2023
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Expand Up @@ -10,6 +10,9 @@ IMPORTANT: When defining the fallback font, you *must specify all four variants*
IMPORTANT: The fallback font only gets used when the primary font is a TrueType or OpenType font (i.e., TTF, DFont, TTC, OTF).
Any glyph missing from an AFM font is simply replaced with the "`not`" glyph (`¬`).

WARNING: You cannot use a color emoji font as a fallback font in Asciidoctor PDF.
The font library used by Asciidoctor PDF does not support color fonts and will cause Asciidoctor to crash.

CAUTION: The `default` theme does not use a fallback font.
However, the built-in `default-with-font-fallbacks` theme does.
In fact, it provides two.
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