Event Handlers Reference JavaScript Reference

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  4. OnBeforeUnload Properties
+----------------+--------------------------------------------------------------+
| Properties     |altKey                          altLeft                       |
|                |clientX                         clientY                       |
|                |ctrlKey                         ctrlLeft                      |
|                |returnValue                     shiftKey                      |
|                |shiftLeft                       type                          |
+----------------+--------------------------------------------------------------+