HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>composition log</title>
</head>
<body>
  <p>First select textbox, then open IME (macOS Option+`; Windows Win+.).</p>
  <label for="example">Example input</label>
  <input type="text" id="example" name="example" />
  <textarea id="eventLog" rows="8" cols="40" readonly></textarea>
  <button type="button" id="clear">Clear</button>
  <script>
    var inputElement = document.querySelector('input[type="text"]');
    var log = document.getElementById("eventLog");
    document.getElementById("clear").addEventListener("click", function () {
      log.textContent = "";
    });
    function handleEvent(event) {
      log.textContent += event.type + ": " + event.data + "\n";
    }
    inputElement.addEventListener("compositionstart", handleEvent);
    inputElement.addEventListener("compositionupdate", handleEvent);
    inputElement.addEventListener("compositionend", handleEvent);
  </script>
</body>
</html>

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Element compositionend — full IME log (Try It)