The automatic stay on appeal prevents the trial court from entering a voluntary dismissal of the action while the case is on appeal from an interlocutory order (such as here, an order denying an Anti-SLAPP motion) because dismissal of the case would affect the Court of Appeal’s jurisdiction over the appeal. Furthermore, even if it were otherwise effective, a voluntary dismissal of the action would not moot the appeal from denial of the Anti-SLAPP motion since the Court of Appeal could grant relief–as it did here by reversing the order denying the Anti-SLAPP motion and directing the trial court to grant the motion and entertain the defendant’s motion for an attorney fee award.