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The PreTeXt Guide

Subsection 4.29.3 Network-Hosted Videos

If a video is shared openly on the Internet, you can simply provide the full URL for the @source attribute. All the other attributes are the same as for the author-provided case, above. Read Subsection 4.28.4 for some considerations when authoring a URL, since there are a few gotchas.
You can frequently discover the URL of a video by first playing it, and then using a context menu (e.g. via a right-click) to reveal an option to copy the video’s location. However, note that there are various techniques sites use to make such a URL temporary, or otherwise unusable. So do some research about potential uses and test carefully. Our example below is provided from a United States government site.
Figure Sea Hares, Flower Garden Banks National Marine Sanctuary