Toastify does not work with new window

[Awesome-E]

When creating a Toast in a popup window, the element is not properly added to the new document.

Steps:

1. Create a new window with w = window.open('about:blank', '', 'width=200')
2. Create a toast, and pass the new window's body w.document.body as the selector option.
3. Show that toast notification

Expected: the toast shows up in the new window's body
Actual: it shows up in the original

https://codepen.io/Awesome-E/pen/gOdVpQO?editors=1010