<html>
<body>
<form id="myForm">
<fieldset id="myFieldset">
<legend>Personalia:</legend>
Name: <input type="text"><br>
Email: <input type="text"><br>
Date of birth: <input type="text">
</fieldset>
</form>
<p>Click the button to display the id of the form the fieldset belongs to.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("myFieldset").form.id;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
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</html>