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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>buttons — vs button</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var leftDown = new MouseEvent("mousedown", {
      button: 0,
      buttons: 1
    });
    var bothDown = new MouseEvent("mousedown", {
      button: 2,
      buttons: 3
    });
    document.getElementById("out").textContent = [
      leftDown.button + " " + leftDown.buttons,
      bothDown.button + " " + bothDown.buttons
    ].join("\n");
  </script>
</body>
</html>

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MouseEvent.buttons — vs button (Try It)