IF this event's default action is cancelable. See respective engine event for its definition of default action.
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.
True if stopPropagation() was called on this event.
The name of the ReaderView this event is related to, if any.
The index in the timeline of the current active SyncMediaSegment.
The current player timeline position.
The targets related with the segment, such as the DOM node being spoken by TTS, or active element when playing media overlays.
The number of targets and their types are format specific.
EPUB Media Overlays reports two targets. One with type "application/smil+xml" containing the "par" node backing this segment (including references to parent "seq" nodes). One with type "application/xhtml+xml" containing the html node targeted by the "par" node.
Each node contains a start and end SyncMediaTimelinePosition. If you for example want to allow user's to skip content such as "table" elements, you can search for nodes with nodeName == "table" and skip to that node's endPosition.
The type of event.
The approximate elapsed time from timeline start in milliseconds