HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery scoped name equals</title>
  <style>
    form { border: 1px dashed #64748b; padding: 12px; margin: 10px 0; }
    input { display: block; margin: 6px 0; padding: 6px; width: 240px; }
    .highlight { border: 2px solid #2563eb; background: #eff6ff; }
  </style>
</head>
<body>
  <form id="login-form">
    <input type="text" name="username" placeholder="username">
    <input type="text" name="username_confirm" placeholder="username_confirm">
  </form>
  <form id="other">
    <input type="text" name="username" placeholder="ignored (other form)">
  </form>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#login-form input[name='username']").addClass("highlight");
  </script>
</body>
</html>

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jQuery #login-form input[name='username'] (Try It)