In brief
animation-play-state selects running or paused. Resuming after a pause continues from the interrupted point rather than necessarily returning to the first frame.
Useful to know
animation-play-state selects running or paused. Resuming after a pause continues from the interrupted point rather than necessarily returning to the first frame. [1]
This differs from removing and reapplying an animation. When designing controls, decide whether the user needs pause, restart or stop; those actions are not interchangeable.
Sources
For further detail and to check the information: