[ttml2] Pull Request: Expand #opacity feature definition using #padding as model (#728).

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

== Expand #opacity feature definition using #padding as model (#728). ==
Closes #728.

See https://github.com/w3c/ttml2/pull/729

Received on Thursday, 10 May 2018 20:56:10 UTC