Timer: 0

    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.