W3C Timed Text Working Group Publishes DAPT Requirements as Group Note

The Timed Text Working Group of the World Wide Web Consortium (W3C) has reached a significant milestone in accessibility and media localization standards. The group has officially published the DAPT Requirements as a Group Note, marking a major step forward in standardizing timed text workflows for dubbing and audio description.

What is DAPT?

DAPT stands for Dubbing and Audio description Profile of TTML2. It is a specialized profile of TTML2 (Timed Text Markup Language 2) designed to support workflows involving:

  • Dubbing: The process of replacing the original dialogue in a film or video with localized dialogue.

  • Audio description: Narration that describes visual elements for the benefit of blind or visually impaired viewers.

The DAPT profile defines technical requirements necessary for efficiently synchronizing and managing timed text in these accessibility and localization workflows.

A Brief Timeline

  • May 2022: The first draft of the DAPT Requirements was published as a Draft Note.

  • October 2022: The document was updated with refinements based on industry feedback.

  • May 2025: The DAPT Requirements have now been finalized and published as a Group Note, reflecting a stable consensus on the technical expectations for DAPT.

Why This Matters

Publishing the DAPT Requirements as a Group Note demonstrates a growing maturity in the tools and standards that support accessible media. With global demand increasing for localized and accessible content, especially in streaming and cinematic platforms, this work ensures better interoperability, consistency, and quality across dubbing and audio description production.

This also strengthens the role of TTML2 as a versatile foundation for timed text applications beyond subtitles and captions, now extending into more complex and specialized use cases.

What’s Next?

With the requirements now published, the Timed Text Working Group and industry stakeholders are expected to focus on:

  • Developing implementations and tooling based on the DAPT profile.

  • Supporting content creators and distributors in adopting DAPT-compliant workflows.

  • Continuing refinement of TTML-based profiles to address emerging accessibility and localization needs.

To learn more or review the document, visit the official DAPT Requirements Group Note.

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