What is the standard of review applied to an order of dismissal following a demurrer?

"We apply a de novo standard of review to a trial court's order of dismissal following an order sustaining a demurrer. [Citation.] In other words, we exercise our 'independent judgment about whether the complaint states a cause of action as a matter of law.' [Citation.]. . . . '[W]e must assume the truth of all facts properly pleaded by the plaintiffs, as well as those that are judicially noticeable.' [Citation.]" (Eckler v. Neutrogena (2015) 238 Cal.App.4th 433, 438.)