HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>focus hint span</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    p { margin: 12px 0; }
    input { padding: 8px 10px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; margin-right: 8px; }
    span { display: none; color: #dc2626; font-weight: bold; }
  </style>
</head>
<body>
  <p>
    <input type="text" value="First field">
    <span>focus fire</span>
  </p>
  <p>
    <input type="text" value="Second field">
    <span>focus fire</span>
  </p>
  <p style="color:#64748b;font-size:14px;">Focus either input to flash the red label.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("input").on("focus", function() {
      $(this).next("span").css("display", "inline").fadeOut(1000);
    });
  </script>
</body>
</html>

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jQuery focus event — hint span fade (Try It)