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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>MouseEvent buttons</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var leftDown = new MouseEvent("mousedown", { button: 0, buttons: 1 });
    var rightClick = new MouseEvent("mousedown", { button: 2, buttons: 2 });
    document.getElementById("out").textContent =
      leftDown.button + " " + leftDown.buttons + "\n" +
      rightClick.button + " " + rightClick.buttons;
  </script>
</body>
</html>

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MouseEvent() — button / buttons (Try It)