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my $abbreviation = abbr( name => "Jane Q. Public", );

my $abbreviation = abbr(
  name => "Jane Q. Public",
  periods => "yes",
);

my $abbreviation = abbr(
  name => "The International House of Pancakes",
  ALLCAPS => "yes",
);

my $abbreviation = abbr(
  name => "frequently asked question",
  ALLCAPs => "yes",
  HTML => "yes",
);

<abbr title="frequently asked question">FAQ</abbr>

sub abbr {
  my %opt = @_;
...
  
  return $initials;
}