<<< mml $$\frac{9}{14}=\frac{9}{14}\genfrac{}{}{0ex}{}{\phantom{\genfrac{}{}{0ex}{}{\phantom{1}}{\phantom{2}}}}{\phantom{\genfrac{}{}{0ex}{}{\phantom{1}}{\phantom{2}}}}$$ >>> native [ EFraction NormalFrac (ENumber "9") (ENumber "14") , ESymbol Rel "=" , EFraction NormalFrac (ENumber "9") (ENumber "14") , EFraction NormalFrac (EPhantom (EFraction NormalFrac (EPhantom (ENumber "1")) (EPhantom (ENumber "2")))) (EPhantom (EFraction NormalFrac (EPhantom (ENumber "1")) (EPhantom (ENumber "2")))) ]