visibilityState property

DocumentVisibilityState get visibilityState

The Document.visibilityState read-only property returns the visibility of the document. It can be used to check whether the document is in the background or in a minimized window, or is otherwise not visible to the user.

When the value of this property changes, the Document.visibilitychange_event event is sent to the Document.

The Document.hidden property provides an alternative way to determine whether the page is hidden.

Implementation

external DocumentVisibilityState get visibilityState;