CueEnterEvent
public class CueEnterEvent : NSObject, CueEventProtocolFired when TextTrackCueEventTypes.ENTER occurs for a TextTrackCue.
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                  The textual representation of the type of event, “enter”. DeclarationSwift public let type: String
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                  The date at which the event occurred. DeclarationSwift public let date: Date
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                  The TextTrackCuewhich was entered.DeclarationSwift public let cue: TextTrackCue
