<!DOCTYPE html>
<html>
<body>

<form id="myForm" action="form_action.asp" autocomplete="on">
  First name:<input type="text" name="fname"><br>
  E-mail: <input type="email" name="email"><br>
  <input type="submit">
</form>

<p>Click the "Try it" button to set autocomplete in the form element to "off".</p>

<p><b>Note:</b> If you are new to the autocomplete attribute, fill in and submit the form, then reload the page, start to fill in the same values in the form again - and see how autocomplete works. Then, click the "Try it" button to set autocomplete to "off" - if you type something in the input field now, the browser will not suggest values based on values that you have entered before.</p>

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

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

<script>
function myFunction() {
    document.getElementById("myForm").autocomplete = "off";
    document.getElementById("demo").innerHTML = "autocomplete is now 'off'.";
}
</script>

</body>
</html>