Page visibility stateThe visibility-state performance entry and the VisibilityStateEntry API measure the timing of page visibility state changes, such as when a tab is no longer visible or the user has switched to another app.performancePerformancelimitedhttps://html.spec.whatwg.org/multipage/interaction.html#the-visibilitystateentry-interfacehttps://developer.mozilla.org/docs/Web/API/VisibilityStateEntryapi.VisibilityStateEntryapi.VisibilityStateEntry.durationapi.VisibilityStateEntry.entryTypeapi.VisibilityStateEntry.nameapi.VisibilityStateEntry.startTimehttps://nowyoucanuse.com/features--page-visibility-state.html