The Node.lastChild
read-only property returns the last child of the node. If its parent is an element, then the child is generally an element node, a text node, or a comment node. It returns null
if there are no child elements.
var last_child = element.lastChild
var tr = document.getElementById("row1"); var corner_td = tr.lastChild;
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https://developer.mozilla.org/en-US/docs/Web/API/Node/lastChild