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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>defaultPrevented cancelable</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var soft = new Event("save");
    soft.preventDefault();

    var hard = new Event("save", { cancelable: true });
    hard.preventDefault();

    document.getElementById("out").textContent =
      "soft (not cancelable): " + soft.defaultPrevented + "\n" +
      "hard (cancelable): " + hard.defaultPrevented;
  </script>
</body>
</html>

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Event.defaultPrevented — needs cancelable (Try It)