play
Begins playing the animation.
If you want to start playing the animation from a specific position, pass a value from 0 to 1 to the play() method where 0 is the beginning of the animation and 1 is the end. For example, use play(0.5) to start playback halfway through the animation.
Parameters
position
An optional position to seek to before toggling play/stop. If null, toggles playback from the current position.