y 

n/a 

n 

Required 

_ 

_ 

_ 

4-24: 

Your application uses the Cancel key to cancel or undo any incomplete motion operation used for selection. Once the user presses the Cancel key to cancel a motion operation, the application ignores subsequent key and button releases until after all buttons and keys are released. Pressing the Cancel key while extending or toggling leaves the selection state of all elements as they were prior to the button press.  

The Cancel key allows the user to cancel an incomplete selection operation quickly and consistently.