TTWG Meeting 2026-05-21

[nigelmegitt]

Agenda

1. This meeting
2. DAPT
2.1 Test suite and implementation report
2.2 Issues and pull requests for discussion
2.2.1 Profile identifier and TTML registry w3c/dapt#248
3. IMSC 1.3
3.1 Rec publication and errata
3.1.1 Errata and Release Tag
3.1.2 TTML Profile Registry entry
3.2 Issues and pull requests for discussion
4. TTML Media Type and Profile Registry
5. WebVTT
5.1 License
6. Impact of AI technologies on Timed Text Working Group's mission
7. TPAC Planning
AOB – please notify of any other AOB now!
8. Meeting close

Time and Joining Details: 15:00 - 16:00 (1 hours) UTC

Please be ready for a prompt start at 15:03am UTC time.

Our teleconference is scheduled with reference to UTC Time, the correct time of this teleconference in your locale may change.

Check https://www.timeanddate.com/worldclock/fixedtime.html?iso=20260521T15&p1=1440

See W3C Calendar link for joining details: https://www.w3.org/events/meetings/74c31b0a-54dc-4869-bc18-4d398335c084/20260521T150000/

(if you can't see the joining details and wish to join please contact the Chair, @nigelmegitt or @gkatsev)

Future meetings and recent activity:

See the TTWG project board for upcoming meetings.

See individual agenda items for recent activity on specific products.

See the TTWG home page for links to repositories and recent activity.

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Agenda+ This meeting

Assign Roles

Chair: Nigel, Gary

Regrets:

Scribe:

Previous meeting: https://www.w3.org/2026/05/07-tt-minutes.html

Prioritise discussion for this meeting and look ahead

Check-point for order of topics and any other business.

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DAPT

Latest publication: CRS (currently 2026-02-10) published at https://www.w3.org/TR/DAPT/

See https://github.com/w3c/dapt/discussions where the discussions live.

Test suite and implementation report

Test repo: https://github.com/w3c/dapt-tests
Implementation Report https://www.w3.org/wiki/TimedText/DAPT_Implementation_Report

There are 0 open issues and 0 open pull requests on the test suite.

Issues and pull requests for discussion

• Address open issues, merge pull requests etc

Since the last meeting:

• issues opened or open and updated: 0
• issues closed: 0
• pull requests closed: 0

0 pull requests open

Other issues and pull requests flagged for agenda are at https://github.com/w3c/dapt/labels/agenda - currently 1 items flagged.

Profile identifier and TTML registry w3c/dapt#248

Pros and cons of having separate profile identifiers for content and processors.

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IMSC 1.3

Latest publication REC 2026-05-21 at https://www.w3.org/TR/ttml-imsc1.3/

There's a w3.org news item about it at https://www.w3.org/news/2026/imsc-text-profile-1-3-is-now-a-w3c-recommendation/

Congratulations!

Rec publication and errata

Transition to Rec approved after AC review.

Tasks:

Errata and Release Tag

Update on errata publication

See also w3c/imsc#643 update for REC publication

REC publication has been approved w3c/transitions#800 (comment)
errata page need to be placed, something like

prepare like IMSC 1.2, as 2026/05/ttml-imsc-1.3-errata.html (directly handled via W3C CVS)
have something under ttwg github, and have proxy through w3.org/AudioVidual/TT/errata/ttml-imsc1.3.html or something

TTML Profile Registry entry

w3c/tt-profile-registry#87 Add entry for IMSC 1.3 Text Profile

Issues and pull requests for discussion

• issues opened or open and updated: 0
• issues closed: 0
• pull requests closed: 1 (editorial)

1 pull requests open: w3c/imsc#643 update for REC publication

Other issues and pull requests flagged for agenda are at https://github.com/w3c/imsc/labels/agenda - currently 0 items flagged

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TTML Media Type Definition and Profile Registry

Updates proposed as pull requests, including draft PRs for IMSC 1.3 Text and DAPT.

• issues opened or open and updated: 1
• pull requests opened: 0

Issues and pull requests flagged for agenda are at https://github.com/w3c/tt-profile-registry/issues?q=state%3Aopen%20label%3Aagenda - currently 1 item flagged

4 pull requests are open and need review.

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WebVTT

License

Update on the change of license and confirm the correct one we want to use.

in CRD streamlined publication prep at w3c/webvtt#547 (comment), license description mismatch found (was seemed to be an error on 2019 CRS publication), and will be fixed to software and document license from next publication.

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Impact of AI technologies on Timed Text Working Group's mission

Team has requested input on w3c/webai-roadmap#37

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TPAC Planning

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Agenda+ Meeting close

Next meeting is 2026-06-04

[nigelmegitt]

Agenda+ from @andreastai : TPAC planning ahead

[himorin]

agenda+ IMSC 1.3 REC publication and errata

• REC publication has been approved REC Decision for IMSC Text Profile 1.3 - ttml-imsc1.3 transitions#800 (comment)
• errata page need to be placed, something like
  1. prepare like IMSC 1.2, as 2026/05/ttml-imsc-1.3-errata.html (directly handled via W3C CVS)
  2. have something under ttwg github, and have proxy through w3.org/AudioVidual/TT/errata/ttml-imsc1.3.html or something

[himorin]

agenda+ WebVTT license

in CRD streamlined publication prep at PR#547, license description mismatch found (was seemed to be an error on 2019 CRS publication), and will be fixed to software and document license from next publication.

update (20260520T1454UTC)

publication updated

• ED at github.io https://w3c.github.io/webvtt/
• CRD at /TR/ https://www.w3.org/TR/2026/CRD-webvtt1-20260520/

(content is the same, just status line; per streamlined publication and both handled by the same GHAction)

[himorin]

for TPAC, repository made as last year at https://github.com/w3c/tpac2026-meetings/

[nigelmegitt]

Minutes at https://www.w3.org/2026/05/21-tt-minutes.html