— Got it. I can em dash now! — — —

> "option shift -" like so —, or if you want an en-dash, just "option -" like –.

That’s true in the US layout, but on other layouts those can be reversed.

> for example in this HN edit box: - – —

They look the same in the HN edit box because the font is monospaced, but once posted they do look different.