Interface PageTransitionEvent
AT_TARGET: 2;
bubbles: boolean;
BUBBLING_PHASE: 3;
cancelable: boolean;
cancelBubble: boolean;
CAPTURING_PHASE: 1;
composed: boolean;
currentTarget: EventTarget;
defaultPrevented: boolean;
eventPhase: number;
isTrusted: boolean;
NONE: 0;
persisted: boolean;
returnValue: boolean;
srcElement: EventTarget;
target: EventTarget;
timeStamp: number;
type: string;
composedPath(): EventTarget[];
initEvent(type: string, bubbles?: boolean, cancelable?: boolean): void;
preventDefault(): void;
stopImmediatePropagation(): void;
stopPropagation(): void;
}
                 
                    
                  Hierarchy
              
              - Event- PageTransitionEvent (View Summary)
 
 Properties
ReadonlyAT_TARGET 
Readonlybubbles
Returns true or false depending on how event was initialized. True if event goes through its target's ancestors in reverse tree order, and false otherwise.
ReadonlyBUBBLING_PHASE 
Readonlycancelable
Returns true or false depending on how event was initialized. Its return value does not always carry meaning, but true can indicate that part of the operation during which event was dispatched, can be canceled by invoking the preventDefault() method.
cancelBubble 
ReadonlyCAPTURING_PHASE 
Readonlycomposed
Returns true or false depending on how event was initialized. True if event invokes listeners past a ShadowRoot node that is the root of its target, and false otherwise.
ReadonlycurrentTarget 
Returns the object whose event listener's callback is currently being invoked.
ReadonlydefaultPrevented 
Returns true if preventDefault() was invoked successfully to indicate cancelation, and false otherwise.
ReadonlyeventPhase 
Returns the event's phase, which is one of NONE, CAPTURING_PHASE, AT_TARGET, and BUBBLING_PHASE.
ReadonlyisTrusted 
Returns true if event was dispatched by the user agent, and false otherwise.
ReadonlyNONE
Readonlypersisted
For the pageshow event, returns false if the page is newly being loaded (and the load event will fire). Otherwise, returns true.
For the pagehide event, returns false if the page is going away for the last time. Otherwise, returns true, meaning that (if nothing conspires to make the page unsalvageable) the page might be reused if the user navigates back to this page.
Things that can cause the page to be unsalvageable include:
The user agent decided to not keep the Document alive in a session history entry after unload Having iframes that are not salvageable Active WebSocket objects Aborting a Document
returnValue 
ReadonlysrcElement 
Readonlytarget
Returns the object to which event is dispatched (its target).
ReadonlytimeStamp 
Returns the event's timestamp as the number of milliseconds measured relative to the time origin.
Readonlytype
Returns the type of event, e.g. "click", "hashchange", or "submit".
 Methods
composedPath 
- composedPath(): EventTarget[]
- Returns the invocation target objects of event's path (objects on which listeners will be invoked), except for any nodes in shadow trees of which the shadow root's mode is "closed" that are not reachable from event's currentTarget. - Returns EventTarget[]
The PageTransitionEvent is fired when a document is being loaded or unloaded.
MDN Reference