<<< mml $\text{Inline double down arrows, display style, thick line }\Downarrow {\displaystyle \genfrac{}{}{1pt}{}{\sin \theta }{M}}\Downarrow \text{ the end.}$ >>> native [ EText TextNormal "Inline double down arrows, display style, thick line\160" , EDelimited "" "" [ Left "\8659" , Right (EFraction NormalFrac (EGrouped [ EMathOperator "sin" , ESymbol Ord "\8289" , EIdentifier "\952" ]) (EIdentifier "M")) , Left "\8659" ] , EText TextNormal "\160the end." ]