HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>scoped multi attr</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    form { padding: 12px; border: 1px solid #e2e8f0; border-radius: 8px; }
    input { display: block; margin: 8px 0; padding: 6px; width: 100%; box-sizing: border-box; }
  </style>
</head>
<body>
  <form id="signup">
    <input type="email" name="email" required placeholder="Email (required)">
    <input type="text" name="nickname" placeholder="Nickname">
  </form>
  <form id="other">
    <input type="email" name="email" placeholder="Other form email">
  </form>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $('form#signup input[type="email"][required]').css("border", "2px solid #2563eb");
  </script>
</body>
</html>

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form#signup input[type="email"][required] (Try It)