# KeyboardEvent Object extends `Event`

* `ctrlKey` Boolean (optional) - whether the Control key was used in an accelerator to trigger the Event
* `metaKey` Boolean (optional) - whether a meta key was used in an accelerator to trigger the Event
* `shiftKey` Boolean (optional) - whether a Shift key was used in an accelerator to trigger the Event
* `altKey` Boolean (optional) - whether an Alt key was used in an accelerator to trigger the Event