File Name: interval_logic_events_pruning_1.htm
Expected Behavior:
at t=5  video1 starts from the beginning.
at t=7  video1 disappears.
at t=10 smile appears.
at t=10 video2 starts from the beginning.
at t=11 smile disappears.
at t=12 video2 disappears.
at t=13 smile appears.
at t=13 video1 starts from the beginning again.
at t=13 video2 starts from the beginning again.
at t=15 video1 disappears.
at t=15 video2 disappears.
at t=19 smile disappears.