[ttml2] Pull Request: Add @extent to isd:{sequence,isd} (#919).

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

== Add @extent to isd:{sequence,isd} (#919). ==
Closes #919.

See https://github.com/w3c/ttml2/pull/920

Received on Saturday, 21 July 2018 17:31:22 UTC