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It led to a forum post from 2018, written by a user named mkv_dreamer :

: It supports advanced features like chapter points, menu systems, and extensive metadata, making it similar to a physical DVD or Blu-ray in digital form. Codec Flexibility 123mkvcom mkv better

: It supports advanced features like chapter markers, menus, and even file attachments (such as cover art or PDF booklets) directly within the container. It led to a forum post from 2018,