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sub _elem {
    my ( $elem_name, $content_fn ) = @_;
...
    push @{ $elem[2] }, $ret if defined $ret and not @{ $elem[2] }; #!
+ new line
    push @{ $__frag->[2] }, $elem;
}

html {
    head { title { "Lorem ipsum" } };
...
        # ...
    };
}