appendChild method
The appendChild() method of the Node interface adds a node to the
end of the list of children of a specified parent node.
Note: If the given child is a reference to an existing node in the document,
appendChild()moves it from its current position to the new position.
If the given child is a DocumentFragment, the entire contents of the DocumentFragment are moved into the child list of the specified parent node.
appendChild() returns the newly appended node, or if the child is a
DocumentFragment, the emptied fragment.
Note: Unlike this method, the Element.append method supports multiple arguments and appending strings. You can prefer using it if your node is an element.
Implementation
external Node appendChild(Node node);