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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>delegateTarget official demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    .box { display: inline-block; padding: 20px; margin: 10px; border: 2px solid #94a3b8; border-radius: 8px; background: #f8fafc; }
    button { padding: 8px 14px; cursor: pointer; }
  </style>
</head>
<body>
  <p>Click the button — the whole box turns red (delegateTarget), not just the button.</p>
  <div class="box"><button type="button">Click me</button></div>
  <div class="box"><button type="button">Or me</button></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $(".box").on("click", "button", function (event) {
      $(event.delegateTarget).css("background-color", "red");
    });
  </script>
</body>
</html>

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jQuery event.delegateTarget — official demo (Try It)