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.