stdlib
1.6
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
JS
stdlib
/
org.w3c.dom
/
WindowEventHandlers
/
onbeforeunload
onbeforeunload
JS
open
var
onbeforeunload
:
(
BeforeUnloadEvent
)
->
String
?
?
(
source
)
Since Kotlin
1.1