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AT_Readonly
bubblesReturns 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.
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BUBBLING_Readonly
cancelableReturns 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.
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CAPTURING_Readonly
composedReturns 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.
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currentReturns the object whose event listener's callback is currently being invoked.
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defaultReturns true if preventDefault() was invoked successfully to indicate cancelation, and false otherwise.
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eventReturns the event's phase, which is one of NONE, CAPTURING_PHASE, AT_TARGET, and BUBBLING_PHASE.
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isReturns true if event was dispatched by the user agent, and false otherwise.
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NONEReadonly
persistedFor 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
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targetReturns the object to which event is dispatched (its target).
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timeReturns the event's timestamp as the number of milliseconds measured relative to the time origin.
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typeReturns the type of event, e.g. "click", "hashchange", or "submit".
The PageTransitionEvent is fired when a document is being loaded or unloaded.
MDN Reference