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The ParentNode.childElementCount read-only property returns an unsigned long representing the number of child elements of the given element.
Node.children is a read-only property that returns a live
HTMLCollection of the child elements of
Node.
The ParentNode.firstElementChild read-only property returns the object's first child
Element, or
null if there are no child elements.
The
ParentNode.lastElementChild read-only property returns the object's last child
Element or
null if there are no child elements.