HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>composedPath read</title>
</head>
<body>
  <div id="wrap">
    <button id="btn" type="button">Click me</button>
  </div>
  <pre id="out">Waiting...</pre>
  <script>
    document.addEventListener("click", function (event) {
      var path = event.composedPath().map(function (n) {
        return n.nodeName || String(n);
      });
      document.getElementById("out").textContent = path.join(" → ");
    });
  </script>
</body>
</html>

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Event.composedPath() — read path (Try It)