use warnings;
use strict;
use CGI;
my $cgi = CGI->new();
print "CGI.pm Version: $CGI::VERSION\n";
print $cgi->checkbox( { -name => 'cb-1', -value => 1, -label => "", -checked => 'checked' } );
print "\n\n";
__END__

CGI.pm Version: 4.60
<label><input type="checkbox" name="cb-1" value="1" checked="checked" /></label>