The Owls Under-21s were held at Hillsborough as Leeds levelled at the last to draw 2-2.
Emmanuel Dieseruvwe gave Wednesday an early lead from the spot and Jack Stobbs doubled the advantage just before the half hour mark.
The visitors, though, halved the deficit moments later through Lewis Walters and completed the comeback in stoppage time with Frank Mulhern on target for Leeds.
Lee Bullen’s side made a good start at Hillsborough as trialist Robbie Cotton was brought down in the area by Leeds man Afolabi Coker and Dieseruvwe did the honours from 12 yards after six minutes.
Owls wideman Stobbs increased the advantage on 28 minutes, advancing onto an accurate feed from Dieseruvwe before drilling home into the bottom corner.
United immediately reduced Wednesday’s lead when Richard Bryson’s persistence down the right paid off, as the youngster’s cross was converted in the centre by Walters.
After the interval, the Owls almost regained their two-goal lead when Dieseruvwe struck wide following tricky wing play by Stobbs on the right.
Franck Betra then headed onto the crossbar from another Stobbs cross with 15 minutes left on the clock but Leeds struck late to take a point from the game.
Adam Davies did well to save from Luke Booker, but Mulhern was on hand to thump into the bottom corner to steal a point in added time.