HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>metaKey — modifiers</title>
</head>
<body>
  <p>Click while holding modifier keys.</p>
  <pre id="out">Waiting…</pre>
  <script>
    document.addEventListener("click", function (e) {
      document.getElementById("out").textContent = JSON.stringify({
        metaKey: e.metaKey,
        ctrlKey: e.ctrlKey,
        altKey: e.altKey,
        shiftKey: e.shiftKey
      }, null, 2);
    });
  </script>
</body>
</html>

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MouseEvent.metaKey — all modifiers (Try It)