Candidate Recommendation Snapshot: IMSC Text Profile 1.3 (Call for Wide Review)

IMSC Text Profile 1.3

https://www.w3.org/TR/2025/CR-ttml-imsc1.3-20251218/

feedback due by: January 15, 2026

Published by
 Timed Text Working Group

Abstract

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.

Status of the Document

This section describes the status of this document at the time of its publication. A list of current W3C publications and the latest revision of this technical report can be found in the W3C standards and drafts index. 

This document was published by the Timed Text Working Group as a Candidate Recommendation Snapshot using the Recommendation track.

Publication as a Candidate Recommendation does not imply endorsement by W3C and its Members. A Candidate Recommendation Snapshot has received wide review, is intended to gather implementation experience, and has commitments from Working Group members to royalty-free licensing for implementations.

This Candidate Recommendation is not expected to advance to Recommendation any earlier than 15 January 2026.

This document was produced by a group operating under the W3C Patent Policy. W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent that the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy.

This document is governed by the 18 August 2025 W3C Process Document.

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Received on Thursday, 18 December 2025 08:31:35 UTC