<<< mml $\text{Inline double up arrows, auto, thick line }\Uparrow \genfrac{}{}{1pt}{}{\sin \theta }{M}\Uparrow \text{ the end.}$ >>> native [ EText TextNormal "Inline double up arrows, auto, thick line\160" , EDelimited "" "" [ Left "\8657" , Right (EFraction NormalFrac (EGrouped [ EMathOperator "sin" , ESymbol Ord "\8289" , EIdentifier "\952" ]) (EIdentifier "M")) , Left "\8657" ] , EText TextNormal "\160the end." ]