HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>.focusin(eventData, handler)</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 400px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    input { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-bottom: 12px; }
    #out { padding: 10px; background: #eff6ff; border-radius: 6px; color: #1e40af; font-family: monospace; font-size: 14px; min-height: 1.2em; }
  </style>
</head>
<body>
  <form id="profile-form">
    <label for="fname">First name</label>
    <input type="text" id="fname" name="first">
    <label for="email">Email</label>
    <input type="email" id="email" name="email">
  </form>
  <div id="out">Focus into any field inside the form.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#profile-form").focusin({ theme: "blue" }, function(event) {
      $("input", this).css("border-color", event.data.theme);
      $("#out").text("Focusin on form | theme: " + event.data.theme);
    });
  </script>
</body>
</html>

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jQuery .focusin(eventData, handler) — form theme (Try It)