Node: lastChild property
  The read-only lastChild property of the Node interface
  returns the last child of the node, or null if there are no child nodes.
    Note: This property returns any type of node that is the last child of this one.
    It may be a Text or a Comment node.
    If you want to get the last Element that is a child of another element,
    consider using Element.lastElementChild.
  
Value
A Node that is the last child of the node, or null is there are no child nodes.
Example
js
const tr = document.getElementById("row1");
const corner_td = tr.lastChild;
Specifications
| Specification | 
|---|
| DOM Standard  # ref-for-dom-node-lastchild①  | 
Browser compatibility
BCD tables only load in the browser