HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>target read</title>
</head>
<body>
  <button id="save" type="button">Save</button>
  <pre id="out">Waiting...</pre>
  <script>
    document.getElementById("save").addEventListener("click", function (event) {
      document.getElementById("out").textContent =
        event.target.nodeName + "\n" + event.target.id;
    });
  </script>
</body>
</html>

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Event.target — read (Try It)