This tests KeyboardEvent.getModifierState(). On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS event.getModifierState('Control') is false PASS event.getModifierState('Alt') is false PASS event.getModifierState('Shift') is false PASS event.getModifierState('Meta') is false PASS event.getModifierState('AltGraph') is false PASS event.getModifierState('CapsLock') is false PASS event.getModifierState('Control') is true PASS event.getModifierState('Alt') is false PASS event.getModifierState('Shift') is false PASS event.getModifierState('Meta') is false PASS event.getModifierState('AltGraph') is false PASS event.getModifierState('CapsLock') is false PASS event.getModifierState('Control') is false PASS event.getModifierState('Alt') is true PASS event.getModifierState('Shift') is false PASS event.getModifierState('Meta') is false PASS event.getModifierState('AltGraph') is false PASS event.getModifierState('CapsLock') is false PASS event.getModifierState('Control') is false PASS event.getModifierState('Alt') is false PASS event.getModifierState('Shift') is true PASS event.getModifierState('Meta') is false PASS event.getModifierState('AltGraph') is false PASS event.getModifierState('CapsLock') is false PASS event.getModifierState('Control') is false PASS event.getModifierState('Alt') is false PASS event.getModifierState('Shift') is false PASS event.getModifierState('Meta') is true PASS event.getModifierState('AltGraph') is false PASS event.getModifierState('CapsLock') is false PASS event.getModifierState('Control') is false PASS event.getModifierState('Alt') is false PASS event.getModifierState('Shift') is false PASS event.getModifierState('Meta') is false PASS event.getModifierState('AltGraph') is true PASS event.getModifierState('CapsLock') is false PASS event.getModifierState('Control') is false PASS event.getModifierState('Alt') is false PASS event.getModifierState('Shift') is false PASS event.getModifierState('Meta') is false PASS event.getModifierState('AltGraph') is false PASS event.getModifierState('CapsLock') is true PASS event.getModifierState('Control') is true PASS event.getModifierState('Alt') is true PASS event.getModifierState('Shift') is true PASS event.getModifierState('Meta') is true PASS event.getModifierState('AltGraph') is true PASS event.getModifierState('CapsLock') is true PASS successfullyParsed is true TEST COMPLETE