HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>querySelector complex</title>
  <style>body{font-family:system-ui,sans-serif;margin:1rem;}.user-panel{margin:0.5rem 0;padding:0.5rem;border:1px solid #ccc;}</style>
</head>
<body>
  <div class="user-panel main">
    <label>Main login <input name="login" value="alice"></label>
  </div>
  <div class="user-panel">
    <label>Other login <input name="login" value="bob"></label>
  </div>
  <pre id="out"></pre>
  <script>
    var el = document.querySelector("div.user-panel.main input[name='login']");
    document.getElementById("out").textContent =
      el ? el.value : "no login field";
  </script>
</body>
</html>

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Document.querySelector — complex selector (Try It)