3

I'm not talking about the yellow lines. I'm talking about the ones highlighted in the screenshot below:

Screenshot of the YouTube video player

And also, why are they different in size?

2

I believe it's a time stamp. They only appear on long videos. The smaller lines signifies a minute, the bigger (deeper) an hour. They make it easier to jump to a specific point in the video.

  • That matches up to the link provided in the comment. Anybody have a canonical source, beyond our observations? – Michael Paulukonis Mar 7 '14 at 21:10

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