W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<body>

<p>This example contains a form with two submit buttons. The first submit button submits the form data to "/action_page.php", and the second submits to "/action_page2.php":</p>

<form action="/action_page.php" method="get">
  First name: <input type="text" name="fname" value="Donald"><br>
  Last name: <input type="text" name="lname" value="Duck"><br>
  <button type="submit">Submit</button><br>
  <button id="myBtn" type="submit" formaction="/action_page2.php">Submit to another page</button>
</form>

<p>If you click on the submit buttons above, notice that the formaction attribute overrides the HTML form's action attribute.</p>

<p>Click the "Try it" button to return the value of the formaction attribute of the second submit button above.</p>

</body>
</html>

​x
 
<!DOCTYPE html><html><body>​<p>This example contains a form with two submit buttons. The first submit button submits the form data to "/action_page.php", and the second submits to "/action_page2.php":</p>​<form action="/action_page.php" method="get">  First name: <input type="text" name="fname" value="Donald"><br>  Last name: <input type="text" name="lname" value="Duck"><br>  <button type="submit">Submit</button><br>  <button id="myBtn" type="submit" formaction="/action_page2.php">Submit to another page</button></form>​<p>If you click on the submit buttons above, notice that the formaction attribute overrides the HTML form's action attribute.</p>​<p>Click the "Try it" button to return the value of the formaction attribute of the second submit button above.</p>​<button onclick="myFunction()">Try it</button>​<p id="demo"></p>​<script>function myFunction() {  var x = document.getElementById("myBtn").formAction;  document.getElementById("demo").innerHTML = x;}</script>​</body></html>​