Timer: 0

    File Name: interval_logic_and_multiple_begins.htm
    Expected Behavior:
    at t=5  video2 (1st interval) starts.
    at t=10 video1 (1st interval) starts 5 seconds into the video.
    at t=11 video1 (1st interval) disappears.
    at t=11 video2 (1st interval) disappears.
    at t=11 video1 (2nd interval) restarts 5 seconds into the video.
    at t=11 video2 (2nd interval) restarts 5 seconds into the video.
    at t=16 video1 and video2 (2nd intervals) disappear.