[ttml2] Pull Request: Refactor extent features (#693).

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

== Refactor extent features (#693). ==
Closes #693.

See https://github.com/w3c/ttml2/pull/744

Received on Monday, 14 May 2018 04:14:54 UTC