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<!DOCTYPE html>
<html>
<body>
<form>
  <fieldset id="myFieldset" name="personalia">
  Name: <input type="text" name="username"><br>
  Email: <input type="text" name="usermail"><br>
  </fieldset>
</form>
<p>Click the button to display the name of the fieldset.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("myFieldset").name;
  document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>