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  <title>dispatchEvent() — detail</title>
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  <pre id="out"></pre>
  <script>
    var bus = new EventTarget();
    var lines = [];
    bus.addEventListener("user:login", function (e) {
      lines.push(e.detail.name + " " + e.detail.id);
    });
    bus.dispatchEvent(new CustomEvent("user:login", {
      detail: { name: "Ada", id: 42 }
    }));
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
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dispatchEvent() — CustomEvent detail (Try It)