"I think the strangest part about the YouTube progress bar is that it doesn't go by the time but instead the video length. On a different channel I have a video that ends at <a href=""https://www.youtube.com/watch?v=iZnLZFRylbs&amp;t=1m54s"">1:54</a>/<a href=""https://www.youtube.com/watch?v=iZnLZFRylbs&amp;t=5m23s"">5:23</a> and the progress bar still hits the end properly."