Annotating the transcript at timemark 0:03 of this YouTube video by Dr Becky on "An ULTRA-HIGH energy cosmic ray hit Earth | Night Sky News Dec 2023" ref https://youtu.be/a_Qeb4vVaqM .

Edit: It annotates the main YouTube.com page instead. Mmm.

Edit2: See also the comment ... mdiroberts (edited Apr 30, 2021) Nov 13, 2020 Why you're having trouble annotating Youtube Per the comments above, this is because Hypothesis uses a process called document equivalence. One of the things we look for on a site is the HTML element rel="canonical". If this is present, we respect the canonical URL the site gives us as the site where the annotation should be. When I open a Youtube video by clicking on it from this page, rel="canonical" points back to youtube.com, and not the actual address of the video. I've noticed that, at least for now, when I open a video in a new tab the rel="canonical" link for the video will actually be the video's address. So you might try opening a video in a new window if you want to annotate on the video's actual page and not have it end up on the home page.

annotation meta: may need new tag: - can't effectively monitor

If I understand it correctly, with hyperaudio, one can also create transcription to somebody else's video or audio when embedded.

In that case, if you add to hyperaudio the annotation capablity of hypothes.is or docdrop, the vision outlined in the article on Global Knowledge Graph is already a reality.