Cleaned up:
use strict;
use warnings;
use feature qw( say );
use HTML::TreeBuilder qw( );
use Object::Destroyer qw( );
open(my $fh_in, "<:encoding(UTF-8)", $ARGV[0]) or die $!;
open(my $fh_out, ">:encoding(cp1252)", $ARGV[1]) or die $!;
my $tree = Object::Destroyer->new(HTML::TreeBuilder->new(), 'delete');
$tree->parse_file($fh_in);
my $h1Element = $tree->look_down("_tag", "h1");
my $h1TrimmedText = $h1Element->as_trimmed_text();
say($fh_out $h1TrimmedText);
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