The id read-only property of the NavigationDestination interface returns the id value of the destination NavigationHistoryEntry if the NavigateEvent.navigationType is traverse, or an empty string otherwise.
The id is a unique, UA-generated value that always represents the history entry, useful to correlate a history entry with an external resource such as a storage cache.
A string representing the id of the destination NavigationHistoryEntry, or an empty string.
navigation.addEventListener("navigate", (event) => {
console.log(event.destination.id);
});