The Wayback Machine - https://web.archive.org/web/20200809070759/https://docs.oracle.com/javafx/2/get_started/img_text/helloworld_scenegraph.htm

This figure shows the hierarchical scene graph of nodes in the Hello World application. The stage is the top-level JavaFX container. The scene is the container for all content. The root node of the scene is a StackPane object. The StackPane contains one child, a button control.