[ttml1] Pull Request: Make smooth transitions a possibility rather than a recommendation

palemieux has just submitted a new pull request for https://github.com/w3c/ttml1:

== Make smooth transitions a possibility rather than a recommendation ==
Closes #304

See https://github.com/w3c/ttml1/pull/306

Received on Tuesday, 26 December 2017 22:01:59 UTC