Howto set up a CSS-Animation for the "packing-process" of a container?

[Moritz Renftle <rueckmeldung renftle net>]

Hi,

I read about GTK's fancy new opportunities concerning CSS-styling and
thought I had a use-case for it:

My app has a Gtk.Grid with other widgets packed into it. Is it possible
to create a CSS-file, which defines an animation for the packing- and
removing-process of the Gtk.Grid?

More generally: is it possible to "connect" animations to signals (e.g.
set up an animation for the "changed"-signal of Gtk.Entry)?

Thanks for any answers,
Moritz

PS: CSS-theming is really fun, keep up the good work!