The reviewing court will presume that the record in an appeal includes all matters material to deciding the issues raised. If the appeal proceeds without a reporter's transcript, this presumption applies only if the claimed error appears on the face of the record.
Cal. R. Ct. 8.163
Advisory Committee Comment
The intent of rule 8.163 is explained in the case law. (See, e.g., Dumas v. Stark (1961) 56 Cal.2d 673, 674.)