[ttml2] Pull Request: Update requirements for claim of document (content) compliance (#495).

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

== Update requirements for claim of document (content) compliance (#495). ==
Closes #495.

See https://github.com/w3c/ttml2/pull/651

Received on Monday, 12 February 2018 03:02:52 UTC