texmath-0.7: tests/writers/mfracZcomp-21.tex
\text{Inline\ double\ up\ down\ arrows,\ text\ style,\ thick\ line }\left. \Updownarrow\frac{\sin\theta}{M}\Updownarrow \right.\text{ the\ end.}
\text{Inline\ double\ up\ down\ arrows,\ text\ style,\ thick\ line }\left. \Updownarrow\frac{\sin\theta}{M}\Updownarrow \right.\text{ the\ end.}