[ttml2] Pull Request: Further constrain ruby descendants (#372).

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

== Further constrain ruby descendants (#372). ==
Closes #372.

See https://github.com/w3c/ttml2/pull/614

Received on Wednesday, 31 January 2018 01:50:55 UTC