How To Properly Space Those Em Dashes

As I’m proofreading, I often come across errant em dashes. Many people don’t know if these should be surrounded by spaces or not. Here’s a brief refresher. According to the Chicago Manual of Style (CMoS), em dashes are not surrounded by spaces. However, AP (the Associated Press) does want a space both before and after em dashes. I hope this was helpful to people out there who are writing today.