[ttml2] Pull Request: Add missing feature designators (#657).

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

== Add missing feature designators (#657). ==
Closes #657.

See https://github.com/w3c/ttml2/pull/664

Received on Monday, 12 February 2018 21:55:54 UTC