Form error without reloading when using Dialog

[openomsk]

We are talking about a function that is described here: https://www.wysiwygwebbuilder.com/form_popup.html
The success page does not open in Dialog, but opens in a new browser tab, which you can see when you submit form number 1
If you replace Dialog with an iframe, the success page works in this iframe, as can be seen in form number 2

Project https://yadi.sk/d/badVnDTu5okNkA

[Pablo]

I'm sorry, this concept cannot be used on a master page/frame.