| ScreenY | The vertical coordinate of the mouse relative to the screen. |
| LayerX | The horizontal coordinate of the mouse relative to the nearest positioned ancestor element. |
| Buttons | Specifies the currently pressed mouse buttons. |
| ScreenX | The horizontal coordinate of the mouse relative to the screen. |
| MovementY | The vertical movement of the mouse since the last event. |
| PageX | The horizontal coordinate of the mouse relative to the whole document. |
| Button | Specifies which mouse button was pressed. |
| X | The horizontal coordinate of the mouse relative to the event target. |
| CtrlKey | Indicates whether the "Ctrl" key was pressed during the event. |
| Y | The vertical coordinate of the mouse relative to the event target. |
| ClientY | The vertical coordinate of the mouse relative to the client area. |
| OffsetX | The horizontal coordinate of the mouse relative to the event target. |
| ShiftKey | Indicates whether the "Shift" key was pressed during the event. |
| LayerY | The vertical coordinate of the mouse relative to the nearest positioned ancestor element. |
| PageY | The vertical coordinate of the mouse relative to the whole document. |
| AltKey | Indicates whether the "Alt" key was pressed during the event. |
| ClientX | The horizontal coordinate of the mouse relative to the client area. |
| OffsetY | The vertical coordinate of the mouse relative to the event target. |
| MovementX | The horizontal movement of the mouse since the last event. |
| ResponseParameters | The response parameters associated with the event. |
| MetaKey | Indicates whether the "Meta" key (Windows key or Command key) was pressed during the event. |