How does the Court of Appeal interpret the "elementary principle of law" in the context of a civil appeal?

"Where findings of fact are challenged on a civil appeal, we are bound by the 'elementary . . . principle of law[] that . . . the power of an appellate court begins and ends with a determination as to whether there is any substantial evidence, contradicted or uncontradicted,' to support the findings below. [Citation.] We must therefore view the evidence in the light most favorable to the prevailing party, giving it the benefit of every reasonable inference and resolving all conflicts in its favor . . . . [Citations.]" (Jessup Farms v. Baldwin (1983) 33 Cal.3d 639, 660.)