y 

n/a 

n 

Required 

_ 

_ 

_ 

5-17: 

If your application supports expert activation, expert actions exist only as shortcuts to application features that are available through another mechanism.  

Expert activation, using mouse double-clicking on buttons, provides a convenient way for experienced users to perform certain tasks quickly. However, new users and keyboard-only users need to be able to perform the same tasks. 

Required 

_ 

_ 

_ 

5-18: 

When the focus is on a button used for expert activation, no default action is available, unless the default and expert actions are the same.  

This rule minimizes possible confusion between default and expert activation. 

Required 

_ 

_ 

_ 

5-19: 

If a component with an expert action is selectable, activating the expert action first selects the component and then performs the expert action.  

A user needs to be able to select a component, even if it has an expert action associated with it.