JSFiddle - React, Tailwind, and code Playground

HTML

<div id="x" class="item"> bla
  <div id="y" class="item"> bla
    
  </div>
</div>
<div id="out"></div>

CSS

.item {
  display: inline-block;
  min-width: 100px; min-height: 100px;
  border: solid 1px black;
  margin: 5px;
}

JavaScript

document.addEventListener("click", function (e) {
  var level = 0;
  for (var element = e.target; element; element = element.parentNode) {
    if (element.id === 'x') {
        document.getElementById("out").innerHTML = (level ? "inner " : "") + "x clicked";
      return;
    }
    level++;
  }
  document.getElementById("out").innerHTML = "not x clicked";
});