The Timed Text Working Group has published a Proposed Recommendation of TTML Profiles for Internet Media Subtitles and Captions 1.2. This specification defines two profiles of [ttml2]: a text-only profile and an image-only profile. These profiles are intended to be used across subtitle and caption delivery applications worldwide, thereby simplifying interoperability, consistent rendering and conversion to other subtitling and captioning formats.
Comments are welcome through 28 July 2020.
Original source: https://www.w3.org/blog/news/archives/8602