Click the "Try it" button to set autocomplete in the form element to "off".
Note: 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.