Pasting YouTube Tag Lists

While drafting a post in which I complained about being unable to usefully paste into the YouTube tag list for a video, I noticed that the feature I wanted is already there, just not easily discoverable. Though it does not seem possible to get anything useful by copying from the tag list, YouTube will split a tag list into individual tags if you delimit the tags by commas, not semicolons or spaces or anything else. Therefore, you can prepare a list of tags and easily paste it into each video in a series without having to retype it every time.