MediaPart

createMediaPartRenderers() returns partRenderers for file parts of an answer; create it once and spread it next to your own renderers. The part is shown by its mediaType: an image opens a fullscreen ImageLightbox, audio and video play in the native <audio> and <video> without autoplay (a captions WebVTT address adds a track), and any other file is a FileAttachment chip that calls onOpenFile or downloads a safe url. Only http(s) addresses and data: images, audio and video reach the page; javascript:, blob: and data:text/html never do. labels covers openImage, imageAlt, audio, video, the names of the chip that opens or downloads (openFile, download) and attachment for the chip itself. MediaPart is the same component for a custom layout.