[ttml2] Pull Request: Add #region-timing feature designation (#169).

skynavga has just submitted a new pull request for https://github.com/w3c/ttml2:

== Add #region-timing feature designation (#169). ==
Closes #169.

See https://github.com/w3c/ttml2/pull/317

Received on Wednesday, 17 May 2017 18:46:45 UTC