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A good question and one we haven't gotten yet! Since we are transcribing for searchability, the difference between a dash, double dash, and em dash is not a crucial one and should not prevent a transcription from being approved. That said, I encourage you to transcribe as closely as you can to the original representation of punctuation. If you think that using the alt code for em-dashes will create the closest represtation, than go for it! And thank you for sharing the code for others who may want to use it .
Crowd.loc.gov Community Manager
Many thanks, Lauren!