Show confirmation dialogue in the existing modal

[konklone]

I got a JavaScript alert when I submitted the form, which was jarring compared to how smooth the rest of the experience was. And as a user I generally expect that submitting a form will show me the feedback to that submission in the same visual space and context as the form.

I think it would be better, for UX and aesthetics, if the form caused the HTML modal to get updated with the confirmation rather than a JS alert.