In general, there is a form with such a button that does not send data, but calls a modal window with two more fields, and a button that sends all data to the mail. How to implement it correctly? You can't make a form inside a form, right?
Source: https://ru.stackoverflow.com/questions/864387/
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id. New fields prescribe theformattribute with theformid value. The modal window is done in javascript. Look for ready-made solutions - ArchDemon