HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>off on delegateTarget</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    .box { display: inline-block; padding: 20px; border: 2px solid #94a3b8; border-radius: 8px; }
    button { padding: 8px 14px; cursor: pointer; }
    #msg { margin-top: 12px; color: #475569; font-size: 14px; max-width: 28rem; }
  </style>
</head>
<body>
  <div class="box"><button type="button">Click once</button></div>
  <p id="msg">First click turns box red and removes the handler. Second click does nothing.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    function onBoxClick(event) {
      $(event.delegateTarget).css("background-color", "red")
        .off("click", "button", onBoxClick);
      $("#msg").text("Handler removed from this box. Click again — no change.");
    }
    $(".box").on("click", "button", onBoxClick);
  </script>
</body>
</html>

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jQuery event.delegateTarget — one-shot .off() (Try It)