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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>initEvent migrate</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    // Before (deprecated):
    // event.initEvent("save", true, true);

    // After:
    var event = new Event("save", {
      bubbles: true,
      cancelable: true
    });

    document.getElementById("out").textContent =
      [event.type, event.bubbles, event.cancelable].join(" ");
  </script>
</body>
</html>

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Event.initEvent() — migrate to Event() (Try It)