Prevent refresh button or prompt message if click refresh (flutter web)

i know that for back button we can do by using the willpopscope, but right now i' m trying to prevent user from refreshing the page, is there a way to disable the refresh button or prompt a message if user click the refresh button?

example of willpopscope

return WillPopScope (
onWillPop: () async {
  return shouldPop;
},
child: const Text('WillPopScope sample'),
);

Solution

Adding this to lib/web/index.html will display a confirmation dialog:

...
<body>
<script type="text/javascript">
  window.onbeforeunload = function() {
      return "Changes that you made may not be saved.";
  }
</script>
...
</body>
...

Like so: