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NavigationHistoryEntry: sameDocument property - Web APIs | MDN
NavigationHistoryEntry: sameDocument property Limited availability
The sameDocument
read-only property of the NavigationHistoryEntry
interface returns true
if this history entry is for the same document
as the current Document
value and current document is fully active, or false
otherwise.
const current = navigation.currentEntry;
console.log(current.sameDocument);
// Will always return true