<<< mml ${\displaystyle \genfrac{}{}{0.2ex}{}{1}{\sqrt{2}+{\displaystyle \frac{1}{\sqrt{3}+{\displaystyle \frac{1}{\sqrt{4}+{\displaystyle \frac{1}{\sqrt{5}+{\displaystyle \frac{1}{\sqrt{6}+\dots }}}}}}}}}}$ >>> native [ EFraction NormalFrac (ENumber "1") (EGrouped [ ESqrt (ENumber "2") , ESymbol Bin "+" , EFraction NormalFrac (ENumber "1") (EGrouped [ ESqrt (ENumber "3") , ESymbol Bin "+" , EFraction NormalFrac (ENumber "1") (EGrouped [ ESqrt (ENumber "4") , ESymbol Bin "+" , EFraction NormalFrac (ENumber "1") (EGrouped [ ESqrt (ENumber "5") , ESymbol Bin "+" , EFraction NormalFrac (ENumber "1") (EGrouped [ ESqrt (ENumber "6") , ESymbol Bin "+" , EIdentifier "\8230" ]) ]) ]) ]) ]) ]