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<!DOCTYPE html>
<html>
<body>
<form action="/action_page.php">
  First name: <input type="text" name="fname" value="Donald"><br>
  Last name: <input type="text" name="lname" value="Duck"><br>
  <input type="submit" id="mySubmit" formaction="/action_page2.php" value="Submit">
</form>
<p>Click the "Try it" button to display the value of the formaction attribute of the submit button above.</p>
<p>Notice that the formaction attribute overrides the HTML form's action attribute (action_page.php).</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("mySubmit").formAction;
  document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>