HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>elementsFromPoint layers</title>
  <style>
    body{font-family:system-ui,sans-serif;padding:1.5rem;}
    .wrap{position:relative;width:220px;height:120px;}
    #card{width:100%;height:100%;background:#dbeafe;display:flex;align-items:center;justify-content:center;}
    #overlay{position:absolute;inset:0;background:rgba(239,68,68,0.35);display:flex;align-items:center;justify-content:center;}
    pre{border:1px solid #ccc;padding:0.75rem;}
  </style>
</head>
<body>
  <div class="wrap">
    <div id="card">card</div>
    <div id="overlay">overlay</div>
  </div>
  <button id="btn" type="button">Read stack at center</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var card = document.getElementById("card");
      var r = card.getBoundingClientRect();
      var stack = document.elementsFromPoint(
        r.left + r.width / 2,
        r.top + r.height / 2
      );
      document.getElementById("out").textContent = stack
        .map(function (el) { return el.id || el.localName; })
        .join(" < ");
    });
  </script>
</body>
</html>

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Document.elementsFromPoint — overlapping layers (Try It)