YouTube makes video chapters official
Found on Ars Technica on Sunday, 31 May 2020
YouTube creators can add chapters to their videos via the description. Just start a list of timestamps with "0:00" followed by chapter titles, with one timestamp on each line. If you don't want chapters, just don't start a timestamp list with "0:00."
So, YouTube finally managed to add something that's been standard for videos for more than a decade now.