Jurisdiction - Attornment
Kunuthur v. Govindareddigari (Ont CA, 2018)
Here the Court of Appeal succinctly states the essence of attornment:
 A party attorns to a court’s jurisdiction when it goes beyond simply challenging the jurisdiction of that court and, instead, litigates a claim on the merits: see Van Damme v. Gelber, 2013 ONCA 388 (CanLII), 115 O.R. (3d) 470, at paras. 3, 24, leave to appeal refused,  S.C.C.A. No. 342; and Wolfe v. Wyeth, 2011 ONCA 347 (CanLII), 282 O.A.C. 64, at para. 44.