[ttml2] Pull Request: port TTML1 fix for ttml1/#192

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

== port TTML1 fix for ttml1/#192 ==
addresses partially #358 

See https://github.com/w3c/ttml2/pull/573

Received on Thursday, 18 January 2018 22:41:31 UTC