texmath-0.6.7: tests/writers/mfrac-03.tex
\frac{{A}}{{B}+\frac{{C}}{{D}+\frac{{E}}{{F}} } } =\frac{\overset{\phantom{0}}{{A}}}{{B}+\frac{{C}}{{D}+\frac{{E}}{\underset{\phantom{0}}{{F}}} } } \frac{{A}}{{B}+\frac{{C}}{{D}+\frac{{E}}{{F}} } } =\frac{\overset{\phantom{0}}{{A}}}{{B}+\frac{{C}}{{D}+\frac{{E}}{\underset{\phantom{0}}{{F}}} } }