def transplant_nodes(parent: Element, new_parent: Element, start: Node, end: Node) -> Element:
start_pos = parent.index(start)
end_pos = parent.index(end)
for _ in range(start_pos + 1, end_pos):
# Note: do not use Element.remove() here.
# It removes wrong node if the target is Text.
subnode = parent.pop(start_pos + 1)
new_parent += subnode
return new_parent
