SwiftDocCVideoMediaClassVideoMediaA block filled with a video.final class VideoMediaTopicsInstance Propertiesvar altText: String?Alternate text describing the video.var caption: MarkupContainerAn optional caption that should be rendered alongside the video.var deviceFrame: String?The name of a device frame that should wrap this video.let originalMarkup: BlockDirectivevar poster: ResourceReference?An image to be shown when the video isn’t playing.var source: ResourceReferenceInstance Methodsfunc accept<V>(inout V) -> V.ResultType Propertiesstatic let directiveName: Stringstatic let introducedVersion: String