What is the purpose of the event window.onpopstate?

What is the purpose of the event window.onpopstate? Correct Answer When a state object is removed

The window.onpopstate event is fired whenever a state object is removed from the browser history, which occurs on browser “back” or “forward”. The object passed into a call to pushState or replaceState is provided as the state property on the event object in the “popstate” event.

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