Why are we using .html instead of .htm?

Fri 27, Dec 2019 html

The answer to this fascinating interesting question is pretty simple:

You should only use .htm if your OS can't handle filename extensions longer than 3 characters:

All HTML documents should have filenames that end with the extension .html unless the files reside on a DOS system, in which case they should have the extension .htm.

"HTML Manual of Style" by Larry Aronson, 1994

DOS didn't support 4 character long filename extensions. That's why it was recommended to use .htm for DOS.


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