unloadEventStart property
The unloadEventStart read-only property returns a
DOMHighResTimeStamp representing the time immediately before the current
document's
unload
event handler starts.
Implementation
external double get unloadEventStart;The unloadEventStart read-only property returns a
DOMHighResTimeStamp representing the time immediately before the current
document's
unload
event handler starts.
external double get unloadEventStart;