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...

</html>

             html
             /      \
...
    "Doc 1"

[% IF age < 10 %]
       Hello, does your mother know you're 
...
       Welcome
    [% END %]

ROOT
...
  child2:  Sorry, you're not old enough to enter ...
  child3:  Welcome

<span id=age_handler>
  <span id="under10">
...
  </span>
</span>

use HTML::TreeBuilder;
my $tree = HTML::TreeBuilder->new();
...

}

look_down->detach() for
    ($this, $that)

$SPAN->KILL_CHILDREN (@children); # fodder for carnivore :)