texmath-0.6.7: tests/writers/mfracZcomp-20.tex
\mathrm{Inline\ double\ down\ arrows,\ display\ style,\ thick\ line~}\Downarrow \frac{{sin}{\theta }}{{M}} \Downarrow \mathrm{~the\ end.}\mathrm{Inline\ double\ down\ arrows,\ display\ style,\ thick\ line~}\Downarrow \frac{{sin}{\theta }}{{M}} \Downarrow \mathrm{~the\ end.}