(function () {
    var targetNode = document.querySelector('.my-selector'); // Set your selector for the parent container.

    var config = { attributes: true, childList: true, subtree: true };

    // Callback function to execute when mutations are observed
    var callback = function(mutationsList, observer) {
        console.log('mutationsList', mutationsList);
        console.trace(); // This is the magic
    };

    var observer = new MutationObserver(callback);
    observer.observe(targetNode, config);
  })();