Is it possible to intercept the submit event of a google form in an iframe on the client?

Question

Google Apps Script

The form is embedded on the site via an iframe, you need to show a custom success status after submitting. And is it possible to get the email of the user who filled out the form to send to the backend? Provided that the checkbox "collect email addresses" is enabled

Answer 1

I don't think it's possible in a modern browser. Only at low security settings.