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Re:Regarding the Em Dash by kps on Sunday January 07, 2018 @01:15PM (#16091860)
Unicode (and so HTML) also has

  U+2008  ‐   HYPHEN
  U+2212  −   MINUS SIGN
HYPHEN is not much used since in most fonts it's identical to ASCII ‘-’. MINUS SIGN is meant to be visually congruent with +×÷=, etc (same stroke width and appropriate alignment).

Personally I have - – — ‐ ‑ − on my usual keyboard layout.

Re:Regarding the Em Dash by anjbe on Sunday January 07, 2018 @02:55PM (#16092332)
Correction: hyphen is U+2010, not U+2008 (which is punctuation space).
Re:Regarding the Em Dash by kps on Sunday January 07, 2018 @03:28PM (#16092500)
Thanks. Too late for me to edit.
Re:Regarding the Em Dash by jsmthrowaway on Sunday January 07, 2018 @01:29PM (#16091923)
Hyphen is also a Western name separator, as in Jean-Luc Picard. Using a hyphen where a dash belongs, because of its ease of use on a typical U.S. layout keyboard, is a common mistake. A lot of people type two hyphens to make a dash, as well, partially because of ASCII, and it was nice to update my phone and Mac recently and see that Apple is now automatically fixing that by default without making me hold down the hyphen—disrupting my typing flow.

You could add the translation before, but it’s cool to introduce a lot of folks who don’t know that to a proper dash.