Dowman makes history as Arsenal strike late, Chelsea beaten
Mikel Arteta's side struggled to break down obdurate Everton until the closing moments at the Emirates Stadium.
But Sweden forward Viktor Gyokeres finally found a way through in the 89th minute, with a helping hand from Everton goalkeeper Jordan Pickford.
Pickford completely missed Dowman's cross and Piero Hincapie bundled the ball back into the six-yard box for Gyokeres to tap into the empty net.
The ensuing scenes of delirium on the pitch and in the stands underlined the significance of Arsenal's fourth successive league win.