HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getModifierState — compare</title>
</head>
<body>
  <p>Click while holding modifiers.</p>
  <pre id="out">—</pre>
  <script>
    document.addEventListener("click", function (e) {
      document.getElementById("out").textContent = JSON.stringify({
        shift: e.getModifierState("Shift") === e.shiftKey,
        control: e.getModifierState("Control") === e.ctrlKey,
        alt: e.getModifierState("Alt") === e.altKey,
        meta: e.getModifierState("Meta") === e.metaKey
      }, null, 2);
    });
  </script>
</body>
</html>

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MouseEvent.getModifierState — vs properties (Try It)