| actionKey | Returns true if the platform-specific action key is pressed. This key is Cmd on macOS, and Ctrl on all other platforms. |
| altKey | Returns true if the Alt key is pressed. |
| button | A value that indicates which mouse button was pressed or released (if any) to cause this event: 0 is the left button, 1 is the right button, 2 is the middle button. A negative value indicates that no mouse button changed state during this event. |
| clickCount | The number of times the button is pressed. |
| commandKey | Returns true if the Windows/Cmd key is pressed. |
| ctrlKey | Returns true if the Ctrl key is pressed. |
| currentTarget | The current target of the event. The current target is the element in the propagation path for which event handlers are currently being executed. |
| localMousePosition | The mouse position in the current target coordinate system. |
| modifiers | Flags that hold pressed modifier keys (Alt, Ctrl, Shift, Windows/Cmd). |
| mouseDelta | The difference of the mouse position between the previous mouse event and the current mouse event. |
| mousePosition | The mouse position in the screen coordinate system. |
| pressedButtons | A bitmask that describes the currently pressed buttons. |
| shiftKey | Returns true if the Shift key is pressed. |