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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>isImmediatePropagationStopped official demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    button { padding: 10px 18px; cursor: pointer; background: #2563eb; color: #fff; border: none; border-radius: 8px; }
    #stop-log { margin-top: 12px; padding: 12px; background: #f1f5f9; border-radius: 6px; font-size: 14px; line-height: 1.8; }
    #stop-log div { padding: 4px 0; border-bottom: 1px solid #e2e8f0; }
  </style>
</head>
<body>
  <button type="button">Click me</button>
  <div id="stop-log">Click the button above.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    function immediatePropStopped(event) {
      var msg = event.isImmediatePropagationStopped() ? "called" : "not called";
      $("#stop-log").append("<div>" + msg + "</div>");
    }
    $("button").on("click", function (event) {
      $("#stop-log").html("");
      immediatePropStopped(event);
      event.stopImmediatePropagation();
      immediatePropStopped(event);
    });
  </script>
</body>
</html>

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jQuery event.isImmediatePropagationStopped() — official demo (Try It)