HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>elementFromPoint mouse</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} .box{display:inline-block;padding:1rem;margin:0.5rem;border:1px solid #999;} pre{border:1px solid #ccc;padding:0.75rem;min-height:3rem;}</style>
</head>
<body>
  <div class="box" id="a">Box A</div>
  <div class="box" id="b">Box B</div>
  <p>Move the mouse over the boxes.</p>
  <pre id="out">Move the mouse…</pre>
  <script>
    document.addEventListener("mousemove", function (event) {
      var el = document.elementFromPoint(event.clientX, event.clientY);
      document.getElementById("out").textContent = el
        ? el.tagName + (el.id ? "#" + el.id : "")
        : "null";
    });
  </script>
</body>
</html>

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Document.elementFromPoint — under the mouse (Try It)