HTML::TreeBuilder is too low-level. Use
HTML::TableExtract.
I also used WWW::Mechanize::GZip to handle the download.
#! /usr/bin/perl
use warnings;
use strict;
use feature qw{ say };
use Syntax::Construct qw{ // };
use open ':std', OUT => ':utf8';
use WWW::Mechanize::GZip;
use HTML::TableExtract;
my $site = 'http://www.fourmilab.ch/yoursky/cities.html';
my $mech = 'WWW::Mechanize::GZip'->new;
$mech->get($site);
$mech->follow_link( text => 'Portland OR' );
my $te = 'HTML::TableExtract'->new;
$te->parse($mech->content);
my $table = ($te->tables)[3];
for my $row ($table->rows) {
say join "\t", map $_ // q(), @$row;
}
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