Get your own website Result Size: 625 x 565
x
 
<!DOCTYPE html>
<html>
<body>
<form id="myForm">
  E-mail: <input type="email" id="myEmail">
</form>
<p>Click the button to display the id of the form the email field belongs to.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("myEmail").form.id;
  document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>