HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getElementsByName vs id</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} input{display:block;margin:0.5rem 0;padding:0.4rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <input id="user-email" name="email" type="email" value="me@example.com">
  <button id="btn" type="button">Compare lookups</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var byId = document.getElementById("user-email");
      var byName = document.getElementsByName("email");
      document.getElementById("out").textContent =
        "same node: " + (byId === byName[0]) + "\n" +
        "byName.length: " + byName.length + "\n" +
        "value: " + byId.value;
    });
  </script>
</body>
</html>

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Document.getElementsByName — name vs id (Try It)