HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>autofocus login</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 360px; }
    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; }
    #login:focus { border-color: #3b82f6; outline: none; box-shadow: 0 0 0 3px rgba(59,130,246,.25); }
    #status { padding: 10px; background: #f0fdf4; border-radius: 6px; color: #166534; font-size: 14px; }
  </style>
</head>
<body>
  <label for="login">Username</label>
  <input type="text" id="login" placeholder="Auto-focused on load">
  <label for="password">Password</label>
  <input type="password" id="password" placeholder="Tab here next">
  <div id="status">Page load will focus #login automatically.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $(function() {
      $("#login").trigger("focus");
      $("#status").text("#login received focus on page load — start typing.");
    });
  </script>
</body>
</html>

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jQuery focus event — auto-focus login on load (Try It)