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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>focus vs focusin</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 440px; }
    #wrapper { padding: 16px; border: 2px dashed #94a3b8; border-radius: 8px; }
    input { width: 100%; padding: 10px 12px; border: 2px solid #3b82f6; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-top: 8px; }
    #out { margin-top: 12px; padding: 10px; background: #f8fafc; border-radius: 6px; font-family: monospace; font-size: 13px; min-height: 2.4em; }
  </style>
</head>
<body>
  <div id="wrapper">
    <strong>Wrapper (#wrapper)</strong>
    <input type="text" id="nested" placeholder="Focus me — watch #out">
  </div>
  <div id="out">Focus the nested input.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var log = [];
    $("#wrapper").on("focus", function() {
      log.push("focus on wrapper (will NOT run for nested input)");
    });
    $("#wrapper").on("focusin", function() {
      log.push("focusin on wrapper (runs when input inside gains focus)");
      $("#out").text(log.join(" | "));
    });
  </script>
</body>
</html>

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jQuery focus vs focusin — parent handler (Try It)