The getChildNodes() method returns a collection of child nodes for the target node. 
It returns a 
  NodeList
 object which contains objects that implement NodeInterface. This method allows you to easily access all child nodes of an element or other node types, enabling traversal and manipulation of the DOM structure.
Description
public AbstractNode::getChildNodes(): NodeListParameters
None
Return Value
A NodeList containing the child nodes of the target node.
Exceptions
None
