[transition] CR Request for ttml-imsc1.2

From https://github.com/w3c/transitions/issues/234

# Document title, URLs, estimated publication date
TTML Profiles for Internet Media Subtitles and Captions 1.2
https://w3c.github.io/imsc/imsc1/spec/ttml-ww-profiles.html
estimated publication date at 19th March 2020

# Abstract
https://w3c.github.io/imsc/imsc1/spec/ttml-ww-profiles.html#abstract

# Status
https://w3c.github.io/imsc/imsc1/spec/ttml-ww-profiles.html#sotd

# Link to group's decision to request transition
https://www.w3.org/2020/03/12-tt-minutes.html#t09

# Changes
https://w3c.github.io/imsc/imsc1/spec/ttml-ww-profiles.html#substantive-changes-summary

# Requirements satisfied
No requirements document

# Dependencies met (or not)

- Requirements document: https://w3c.github.io/imsc-vnext-reqs/
- References: https://w3c.github.io/imsc/imsc1/spec/ttml-ww-profiles.html#references
- External groups
  - https://lists.w3.org/Archives/Member/member-tt/2020Jan/0000.html
  - https://lists.w3.org/Archives/Member/member-tt/2020Jan/0001.html
  - https://lists.w3.org/Archives/Member/member-tt/2020Jan/0002.html
  - https://lists.w3.org/Archives/Member/member-tt/2020Jan/0003.html
  - https://lists.w3.org/Archives/Member/member-tt/2020Jan/0004.html
  - https://lists.w3.org/Archives/Member/member-tt/2020Jan/0005.html
  - https://lists.w3.org/Archives/Member/member-tt/2020Jan/0006.html

# Wide Review
Asked for HR at 16 Oct 2019, with 3 mo period.

* a11y: [mail for request](https://lists.w3.org/Archives/Public/public-tt/2019Oct/0041.html), list of issues https://github.com/w3c/imsc/issues?q=is%3Aissue+label%3Aa11y-needs-resolution
* i18n: [mail for request](https://lists.w3.org/Archives/Public/public-tt/2019Oct/0040.html), no issue raised
* privacy: response from Jeffrey Yaskin at https://lists.w3.org/Archives/Public/public-tt/2019Nov/0011.html
* security: https://lists.w3.org/Archives/Public/public-web-security/2020Feb/0002.html
* TAG: w3ctag/design-reviews#474

# Issues addressed
issues were addressed at:
https://github.com/w3c/imsc/issues?q=is%3Aissue+label%3Aimsc1.2

# Formal Objections
None

# Implementation
For this specification to exit the CR stage, at least 2 independent implementations of every feature defined in this specification but not already present in either [TTML2](https://www.w3.org/TR/ttml2/) or [ttml-imsc1.1](https://www.w3.org/TR/ttml-imsc1.1/) need to be documented in the implementation report. The Working Group does not require that implementations are publicly available but encourages them to be so.

The Working Group has not identified features "at risk" for this specification.

Preliminary implementation report at https://www.w3.org/wiki/TimedText/IMSC1_2_Implementation_Report

# Patent disclosures
None
https://www.w3.org/2004/01/pp-impl/34314/status

Received on Monday, 16 March 2020 15:52:50 UTC