Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<form id="myForm">
Select your favorite fruit:
<select id="mySelect">
  <option>Apple</option>
  <option>Orange</option>
  <option >Pineapple</option>
  <option>Banana</option>
</select>
</form>

<p>Click the button to return the id of the form the dropdown list belongs to.</p>

<button type="button" onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var x = document.getElementById("mySelect").form.id;
    document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>