The W3C Team has proposed advancing the IMSC Text Profile 1.3 to W3C Recommendation.

Published by the Timed Text Working Group as a Candidate Recommendation Draft, this specification defines a text-only profile of [ttml2] intended for subtitle and caption delivery applications worldwide. It improves over the Text Profile specified at at [ttml-imsc1.2], with the improvements summarized at L. Summary of substantive changes. #WebStandards #TimedText https://www.w3.org/news/2026/proposed-advancement-of-imsc-text-profile-1-3-to-w3c-recommendation/