2.2.2.5-7 Non-Selection of Conflicting Menu Items

Users should not be able to select menu items that are in conflict.

Additional Information:
Menu items that are in conflict might be, for example, two different font sizes in a text input task. Users should, however, be able to select multiple menu items that are not in conflict (e.g., a font size and font type in text input). Each menu item selection would be a separate transaction with the system.