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  1. or download this
    my $html = HTML::TagParser->new($line);
my @elem = $html->getElementsByClassName($class);
  2. or download this
    my $html = HTML::TagParser->new($line);
my $body = $html->getElementById($id);
my @elem = $body->getElementsByClassName($class);
  3. or download this
    my $html = HTML::TagParser->new($line);
my $body = $html->getElementById($id);
$body = $body->subTree(); # $body is now a new HTML::TagParser object
my @elem = $body->getElementsByClassName($class);