HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ctrlKey — log</title>
</head>
<body>
  <p id="log">The ctrl key was pressed while the cursor was moving: false</p>
  <script>
    var log = document.querySelector("#log");
    window.addEventListener("mousemove", function (e) {
      log.textContent =
        "The ctrl key was pressed while the cursor was moving: " + e.ctrlKey;
    });
  </script>
</body>
</html>

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MouseEvent.ctrlKey — mousemove log (Try It)