Question

Do you know how I could recover an item deleted with JavaScript in the following way:

elem1.parentNode.removeChild(elem1);

Answer 1

As written in the MDN documentation removeChild will return a reference to the removed child node. Usage like this:

var oldChild = element.removeChild(child);
element.removeChild(child);

Further:

The removed child node still exists in memory, but is no longer part
of the DOM. You may reuse the removed node later in your code, via the
oldChild object reference.