HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>explicitOriginalTarget fallback</title>
</head>
<body>
  <button id="el" type="button">Run helper</button>
  <pre id="out">Waiting...</pre>
  <script>
    function getUsefulTarget(event) {
      if (
        "explicitOriginalTarget" in event &&
        event.explicitOriginalTarget
      ) {
        return event.explicitOriginalTarget;
      }
      return event.target;
    }

    document.getElementById("el").addEventListener("click", function (event) {
      var node = getUsefulTarget(event);
      document.getElementById("out").textContent =
        "useful target nodeName: " + node.nodeName +
        "\n(used Mozilla field: " +
        ("explicitOriginalTarget" in event) + ")";
    });
  </script>
</body>
</html>

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Event.explicitOriginalTarget — portable fallback (Try It)