SelectionAnimate[notebook] animates graphics in the current selection in a notebook.
SelectionAnimate[notebook, t] animates graphics for t seconds.
The first argument of SelectionAnimate is a NotebookObject.
The current selection for SelectionAnimate will typically be a cell group.
SelectionAnimate stops the animation as soon as you do any interactive operation in the front end, such as pressing a key or clicking the mouse.
The timing in SelectionAnimate does not count setup or initial rendering of frames.
See The Mathematica Book: Section 2.10.3.
See also: AnimationDisplayTime, SelectionEvaluate.