Feature Request: storageEvent listener

[rokoroku]

It'd be great if we can listen any change event from other origin.
It could be achieved via HTML5 storageEvent

• https://developer.mozilla.org/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API#Responding_to_storage_changes_with_the_StorageEvent
• https://html5demos.com/storage-events