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Flutter
dart:html
BeforeUnloadEvent
returnValue property
returnValue
dark_mode
light_mode
returnValue
property
String
?
returnValue
Implementation
String? get returnValue native;
void
returnValue=
(
String
?
value
)
Implementation
set returnValue(String? value) native;
Flutter
dart:html
BeforeUnloadEvent
returnValue property
BeforeUnloadEvent class
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