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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>addEventListener() — this</title>
</head>
<body>
  <button id="demoBtn" type="button">Click me</button>
  <pre id="out">Waiting…</pre>
  <script>
    var button = document.querySelector("#demoBtn");
    var out = document.querySelector("#out");
    button.addEventListener("click", function (e) {
      out.textContent = [
        "this.id=" + this.id,
        "currentTarget===this: " + (e.currentTarget === this)
      ].join("\n");
    });
  </script>
</body>
</html>

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addEventListener() — this binding (Try It)