Properties of the event object.
| PROPERTY | DESCRIPTION |
| data | Passed only with the dragDrop event, this property returns the URLs of the dropped objects in an array. |
| modifier | Specifies the modifier keys associated with a mouse or key event. ALT_MASK, CONTROL_MASK, SHIFT_MASK, and META_MASK are the modifier's keys. |
| which | Specifies the mouse button pressed or the ASCII value of a pressed key. |
| screenY | Specifies the cursor's vertical position (in pixels), relative to the screen. |
| screenX | Specifies the cursor's horizontal position (in pixels), relative to the screen. |
| pageY | Specifies the cursor's vertical position (in pixels), relative to the page. |
| pageX | Specifies the cursor's horizontal position (in pixels), relative to the page. |
| layerY | Synonymous with y. Specifies the object height when passed with the resize event. If any other event occurs, it specifies the cursor's vertical position in pixels in relation to the layer. |
| layerX | Synonymous with x. Specifies the object width when passed with the resize event. If any other event occurs, it specifies the cursor's horizontal position in pixels in relation to the layer. |
| target | Represents the object to which the event was sent. |
| type | Specifies the event type. |