Hello, how can i make sure that a user taking a survey is prompted (warning popup confirm/cancel) when they click close the browser or tab without submitting the form.
@thegreat_one, the filled-up forms are safely stored in the browser even if you have not submitted the form. You should, however, not clear the cache of the browser. If you clear the cache, the filled-up forms get deleted, and you will not be able to access the same.
You should be able to learn more through our support article Collecting Data through Web Forms.