[ttml2] Pull Request: port modified text from TTML1

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

== port modified text from TTML1 ==
Partially addresses #358 

See https://github.com/w3c/ttml2/pull/599

Received on Monday, 29 January 2018 22:28:39 UTC