Type something in the form, then leave the page and come back and your changes will reappear
<!-- jQuery is required if you're not already using it -->
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="http://www.top-site-list.com/scripts/assets/form-autosave/jquery.sayt.min.js"></script>
<script>
$(function(){
$('form').sayt();
})
</script>