Over on Meta Stack Exchange, SQB asked Which sites have YouTube embedding on?
Searching on Puzzling Meta, I was able to find a post requesting support for code snippets, but found no mention of embedded YouTube videos. Additionally, YouTube embedding is not shown in the markdown preview window, so there's no way to test without posting publically.
I originally planned on testing in The Riddle Sandbox, but that doesn't seem to fall in line with the Sandbox's intended use.
Are embedded YouTube videos supported on Puzzling?