<!DOCTYPE html>
<html>
<body>
<p>This example contains a form with a submit button that submits the form to a new window:</p>
<form action="demo_form.asp" method="get">
First name: <input type="text" name="fname" value="Donald"><br>
Last name: <input type="text" name="lname" value="Duck"><br>
<button id="myBtn" type="submit" formtarget="_blank">Submit</button>
</form>
<p>Click on the "Try it" button to change the value of the formtarget attribute of the submit button above.</p>
<p><b>Note:</b> Click on the submit button before and after you have clicked on the "Try it" button.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("myBtn").formTarget = "_self";
document.getElementById("demo").innerHTML = "The value of the formtarget attribute was changed from '_blank' to '_self'.";
}
</script>
</body>
</html>