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/usr/bin/html2xhtml is in libhtml-html5-parser-perl 0.301-1.

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#!/usr/bin/perl

eval 'exec /usr/bin/perl  -S $0 ${1+"$@"}'
    if 0; # not running under some shell
## skip Test::Tabs

use 5.010;
use HTML::HTML5::Parser;

my $input  = shift // '-';
my $output = shift // '-';

my $parser = HTML::HTML5::Parser->new;
my $dom = ($input eq '-')
	? $parser->parse_string(do { local $/ = <STDIN> })
	: $parser->parse_file($input);

if ($output eq '-')
{
	print $dom->toString;
}
else
{
	open my($fh), '>:encoding(UTF-8)', $output;
	print $fh $dom->toString;
	close $fh;
}