    if ( scalar $self->content_list == 0 && $self->_empty_element_map->{ $self->tag } ) {
        return $tag . " />";
    }
    else {
        return $tag . ">";
    }

##</code><code>##

#!/usr/local/bin/perl

use strict;
use warnings;

use HTML::TreeBuilder;

my $h = HTML::Element->new_from_lol(
            ['html',
                ['hr'],
                ['br'],
                ['img',    {src => 'pic.jpg'}],
            ],
);

{
  # suppress xhtml /> on these tags:
  my @noslash = qw/ hr br img /;
  # by temporarily pretending the can have content:
  local @HTML::Tagset::emptyElement{ @noslash } = 0;
  # and have optional end tags:
  local @HTML::Tagset::optionalEndTag{ @noslash } = (1) x @noslash;

  print $h->as_HTML;
}

__END__
<html><hr><br><img src="pic.jpg"></html>