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→Formatting with {{cmd|definemathfraction}}
\definemathfraction [myfracx][mathstyle=script,alternative=outer]
\framed[frame=off,align=normal]{% <=== just to improve wiki rendering
${a^{2^{2^2}}\over a}$
$\frac{a^{2^{2^2}}}{a}$
$\frac{a^{2}}{b}$
$\myfrac{a^{2}}{b}$
$\myfracx{a^{2}}{b}$}
</context>