GObject
  GtkObject
  GtkWidget
  GtkContainer
  GtkBin
  GtkMozEmbed

Description

GtkMozEmbed is an easy-to-use widget that allows you to embed a Mozilla-based browser into your application. It's designed to be easy to use and uncomplicated to make the barrier for use as low as possible.

Look in the ext/mozembed/demos directory in the PHP-GTK 2 source distribution for an example script that uses this widget.