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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getModifierState — Shift</title>
</head>
<body>
  <p>Click anywhere. Try holding Shift.</p>
  <pre id="out">—</pre>
  <script>
    document.addEventListener("click", function (e) {
      document.getElementById("out").textContent =
        String(e.getModifierState("Shift"));
    });
  </script>
</body>
</html>

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MouseEvent.getModifierState — Shift (Try It)