Tryit Editor v2.9

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

<form id="myForm">
<textarea id="myTextarea" rows="4" cols="50">
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</textarea>
</form>

<p>Click the button to display the id of the form the text area belongs to.</p>

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

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

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

</body>
</html>