texmath-0.8: 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.}