When it seemed Leeds would have to settle for a 1-0 lead at the interval, the visitors struck in first-half stoppage time.
Raphinha carelessly gave the ball away in midfield and, although Oliver McBurnie’s shot was charged down, the ball fell to Osborn and his effort had clearly crossed the goal-line when it was blocked by Luke Ayling.
Leeds was soon back in front after the restart.
Tyler Roberts’ diagonal ball found Harrison and his attempted low cross aimed for Raphinha at the back post was diverted past Ramsdale by the sliding Jagielka.
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