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  <title>initMouseEvent — modifiers</title>
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  <pre id="out"></pre>
  <script>
    var event = document.createEvent("MouseEvents");
    event.initMouseEvent(
      "click", true, true, window, 0,
      0, 0, 0, 0,
      false, false, true, false,
      0, null
    );
    document.getElementById("out").textContent = [
      event.shiftKey,
      event.ctrlKey,
      event.altKey
    ].join("\n");
  </script>
</body>
</html>

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MouseEvent.initMouseEvent — modifiers (Try It)