HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>compositionstart listener</title>
</head>
<body>
  <p>Focus the field and start an IME (e.g. Win+., Option+`, or a CJK keyboard).</p>
  <input type="text" placeholder="Type with IME" />
  <pre id="out">(waiting for compositionstart)</pre>
  <script>
    var inputElement = document.querySelector('input[type="text"]');
    var out = document.getElementById("out");
    inputElement.addEventListener("compositionstart", function (event) {
      out.textContent = "generated characters were: " + event.data;
    });
  </script>
</body>
</html>

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Element compositionstart — addEventListener (Try It)