HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>altKey — log</title>
</head>
<body>
  <p>Click anywhere (hold Alt/Option to see true).</p>
  <pre id="out">Waiting for click…</pre>
  <script>
    document.addEventListener("click", function (e) {
      document.getElementById("out").textContent =
        "The alt key is pressed: " + e.altKey;
    });
  </script>
</body>
</html>

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MouseEvent.altKey — log on click (Try It)