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// Javascript
var links = document.getElementsByTagName('a');
...
for (var i = 0; i < links.length; i++) {
    alert(links[i].href);
}

# Perl
my $document = HTML::HTML5::Parser->load_html(location => $url);
...
for (my $i = 0; $i < @links; $i++) {
    warn($links[$i]{href});
}