All appellate courts have rules governing the form and structure of appellate briefs.
Following these rules is quite important. Below is a discussion of a 9th Circuit case where the Court of Appeals took drastic action against an appellant for repeated and egregious violations of these rules. Apparently frustrated with the effort required to perform a proper review when those rules are not followed, the court struck the appellant's briefs and dismissed the appeal, finding it unnecessary to discuss the merits. The opinion itself makes interesting reading and expresses the depth of feeling that the circuit has on this issue. The Second Circuit has overly strict rules on typeface.