🔗 Unsung: Fingers don’t look around:

You might press ⌘S twice in a row. Or after an undo to an already saved state. […] Or after just sitting down to an open document that’s already saved. […] The beautiful raw power of ⌘S as a citizen of motor memory is that it’s automatic, mindless, habitual.

That’s why ⌘S here needs to be both deterministic and idempotent – if there is nothing to save, don’t let it fall back to the browser, don’t show an error message, don’t beep at the user. Just ignore the keystroke altogether.

Wiki software makers, please take note.