[ttml2] Pull Request: add note as per ttml1/#235

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

== add note as per ttml1/#235 ==
partially addresses #358 

See https://github.com/w3c/ttml2/pull/577

Received on Thursday, 18 January 2018 23:31:01 UTC