What is the test to prove causation in a negligence action?

Ontario, Canada

The following excerpt is from Graham v. Toronto (City), 2009 CanLII 66908 (ON SC):

The primary test to prove causation in a negligence action is set down in the decision of Resurfica Corporation v. Hanke (2007) S.C.C. 7. The plaintiff bears the burden of showing that “but for” the negligent act or omission of the defendant, the injury would not have occurred.

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