impl HTMLTableElement {
    fn func() {
        if number_of_row_elements == 0 {
            if let Some(last_tbody) = node.rev_children()
                    .filter_map(DomRoot::downcast::<Element>)
                    .find(|n| n.is::<HTMLTableSectionElement>() && n.local_name() == &local_name!("tbody")) {
                        last_tbody.upcast::<Node>().AppendChild(new_row.upcast::<Node>())
                                                   .expect("InsertRow failed to append first row.");
                    }
        }

        if number_of_row_elements == 0 {
            if let Some(last_tbody) = node
                    .find(|n| n.is::<HTMLTableSectionElement>() && n.local_name() == &local_name!("tbody")) {
                        last_tbody.upcast::<Node>().AppendChild(new_row.upcast::<Node>())
                                                   .expect("InsertRow failed to append first row.");
                    }
        }
    }
}