<<< mml $$\frac{1}{8}=\frac{1}{\underset{\phantom{0}}{8}}$$ >>> native [ EFraction NormalFrac (ENumber "1") (ENumber "8") , ESymbol Rel "=" , EFraction NormalFrac (ENumber "1") (EUnder False (ENumber "8") (EPhantom (ENumber "0"))) ]