If this event's default action has been canceled/prevented by a call to preventDefault()
True if stopImmediatePropagation() was called on this event.
If this event runs in a "trusted" context, i.e. the event callback is executed during a user-generated event such as "click" or "pointerdown".
The type of engine event object this JSON structure represents.
The current PageProgressionTimeline data
True if stopPropagation() was called on this event.
The name of the ReaderView this event is related to.
The type of event.
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IF this event's default action is cancelable. See respective engine event for its definition of default action.