What is the test for a finding of substantial evidence under a substantial evidence standard of review?

Moreover, "'[w]e review any findings of fact that formed the basis for the award of sanctions under a substantial evidence standard of review.'" (In re Marriage of Corona, supra, 172 Cal.App.4th at p. 1226.) Under that standard of review, "we presume that the record contains evidence to sustain every finding of fact. [Citation.] It is the appellant's burden to demonstrate that it does not. [Citation.] [] In furtherance of its burden, the appellant has the duty to fairly summarize all of the facts in the light most favorable to the judgment. [Citation.] Further, the burden to provide a fair summary of the evidence 'grows with the complexity of the record.'" (Boeken v. Philip Morris Inc. (2005) 127 Cal.App.4th 1640, 1658.)