Timer: 0

    File Name: interval_logic_and_events_1.htm
    Expected Behavior:
    the smile image is shown from 0 to 20s
    the video2 begins at 5s and plays until 15s.
    the video1 is shown at 10s, starting 5s into the video.
    A click before 10s will do nothing. After 10s,
    video1 will play until a click occurs on the smil image.
    If no click occurs between 10s and 20s, then there is no way
    to generate the smile.click and the video will play indefinitely.