en", r.visibilityChangeEventName = "msvisibilitychange") : void 0 !== document.webkitHidden && (r.hiddenPropName = "webkitHidden", r.visibilityChangeEventName = "webkitvisibilitychange"), document.addEventListener(r.visibilityChangeEventName, function () { document[r.hiddenPropName] ? r.triggerUserHasLeftPage() : r.triggerUserHasReturned() }, !1), window.addEventListener("blur", function () { r.triggerUserHasLeftPage() }), window.addEventListener("focus", function () { r.triggerUserHasReturned() }), documen