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sub dump_tree {
    my $thing = shift;
    print "<div>";
...
    print $thing if $thing->is_printable;
    print "</div>";
}

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/* Take these as deep as you need/want and apply.class */
div { background-color: #111; }
div>div { background-color: #611; }
div>div>div{ background-color: #161; }
div>div>div>div { background-color: #116; }