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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>buttons — synthetic</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var event = new MouseEvent("mousemove", {
      buttons: 3,
      bubbles: true
    });
    document.getElementById("out").textContent = [
      event.buttons,
      (event.buttons & 1) === 1,
      (event.buttons & 2) === 2,
      (event.buttons & 4) === 4
    ].join("\n");
  </script>
</body>
</html>

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MouseEvent.buttons — synthetic (Try It)