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The Timeline is located below the Stage. Like films, Flash documents measure time in frames. As the movie plays, the playhead, shown as a red vertical line, advances through the frames in the Timeline. You can change the content on the Stage for different frames. To display a frame’s content on the Stage, move the playhead to that frame in the Timeline.
At the bottom of the Timeline, Flash indicates the selected frame number, the current frame rate (how many frames play per second), and the time that has elapsed so far in the movie.