If relief granted by the trial court is temporal and expires before an appeal can be heard, is the appeal moot?

"If relief granted by the trial court is temporal, and if the relief granted expires before an appeal can be heard, then an appeal by the adverse party is moot. [Citation.] However, 'there are three discretionary exceptions to the rules regarding mootness: (1) when the case presents an issue of broad public interest that is likely to recur [citation]; (2) when there may be a recurrence of the controversy between the parties [citation]; and (3) when a material question remains for the court's determination.' " (Environmental Charter High School v. Centinela Valley Union High School Dist. (2004) 122 Cal.App.4th 139, 144; Harris v. Stampolis (2016) 248 Cal.App.4th 484, 495 (Harris).)