Today, the W3C Team proposed advancing the IMSC Text Profile 1.3 to W3C Recommendation. Published by the Timed Text Working Group as a Candidate Recommendation Draft on 3 April 2026, 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.
Proposed Advancement of IMSC Text Profile 1.3 to W3C Recommendation | 2026 | News
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