Comment by susam

[EDIT: This was meant to be a reply to another comment in this thread but I posted it under the top-level comment by mistake. I am leaving this comment intact anyway, in case someone finds it useful.]

The web browsers don't highlight the feed URL information embedded in the HTML anymore, quite unfortunately. But if you go to a YouTube video, say, <https://www.youtube.com/watch?v=9kaIXkImCAM> and then view or inspect the HTML source, you can find the LINK tag for the feed:

  <link rel="alternate" type="application/rss+xml" title="RSS" href="https://www.youtube.com/feeds/videos.xml?channel_id=UCi8C7TNs2ohrc6hnRQ5Sn2w">

So the feed URL in this case is: <https://www.youtube.com/feeds/videos.xml?channel_id=UCi8C7TN...>.