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<kbd>
-Any keys or key combinations, mouse buttons, or controllers should be marked
-with this element.
+Any keys or key combinations, mouse buttons or controllers, menu items or
+textual user input should be marked with this element. It is used here in
+the widest possible sense, qualified by classes.
E.g.:
"Press <kbd>F</kbd> to fit all tracks to the height of the Editor window."
"Move <kbd>Fader 1</kbd> on your MIDI controller to bind it.