What is the effect of husband's failure to comply with rules governing appellate briefs?

Even if we were to overlook husband's failure to comply with the rules governing appellate briefs and to attempt to address his arguments on the merits, we would reject them because his brief in any event fails to show reversible error. " 'A judgment or order of the lower court is presumed correct . . . and error must be affirmatively shown. This is not only a general principle of appellate practice but an ingredient of the constitutional doctrine of reversible error.' " (Denham v. Superior Court (1970) 2 Cal.3d 557, 564.)