Checking equality of 2 DOM Elements

Check out the API for DOM nodes. It seems like you could use isEqualNode to achieve this.

https://developer.mozilla.org/en-US/docs/Web/API/Node/isEqualNode

element1 and element2 are references to the same place in the DOM tree. Just check

if( element1 == element2 )
{
  alert("same") ;
}