Cross site (XS Addon) can popup window be bigger than the embed div?

I want to create a Vaadin button which can be embedded in a webpage using the XS addon.
When the user clicks the button a window should open which covers most of the webpage. Is this possible?
I have tested simular behaviour with a button embedded using an Iframe, but the window can (logically?) not be bigger than the iframe size.
So can a popup window be bigger than the embed div?

The simplest thing would be to code it, but unfortunately I can not test this as I am using Vaadin 7, so I have to wait till June or something. But I would like to know so we can plan features accordingly.

Regards, Rob.

Yes, it can.

cheers,
matti