\starttext
\font\test={file:linlibertine_r.otf:+frac}
\test 1/2 3/4 5/6 7/8 9/10 11/12 31415/27182 1000/1000000
\stoptext
gives as output
½ 3¾ 5⅚ 7⅜ 9/10 1⅟12 31415/27182 1000/1000000
(I couldn't build an example without the primitive command. After
\definefontfeature[frac][frac=yes]
\definefontfamily[default][rm][linuslibertineo][features=frac]
context always falls back to latin modern)
A similar plaintex example for xetex
\font\test="[linlibertine_r.otf]:+frac"
\test 1/2 3/4 5/6 7/8 9/10 11/12 31415/27182 1000/1000000
\bye
gives the correct result:
¹⁄₂ ³⁄₄ ⁵⁄₆ ⁷⁄₈ ⁹⁄₁₀ ¹¹⁄₁₂ ³¹⁴¹⁵⁄₂₇₁₈₂ ¹⁰⁰⁰⁄₁₀₀₀₀₀₀
A plain tex example for luatex is broken too but differently to the
context version, one gets at least the correct numbers:
\input luaotfload.sty
\font\test={file:linlibertine_r.otf:+frac}
\test 1/2 3/4 5/6 7/8 9/10 11/12 31415/27182 1000/1000000
\bye
½ ¾ ⅚ ⅞ 9/10 1⅟12 31415/27182 1000/1000000
--
Ulrike Fischer
http://www.troubleshooting-tex.de/
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