[ttml2] Pull Request: clarify usages of tts:direction, including relationship to tts:unicodeBidi

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

== clarify usages of tts:direction, including relationship to tts:unicodeBidi ==
closes #264 

See https://github.com/w3c/ttml2/pull/562

Received on Monday, 15 January 2018 18:46:15 UTC