[ttml2] Pull Request: Note potential for false negatives with [validate document] (#876).

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

== Note potential for false negatives with [validate document] (#876). ==
Closes #876.

See https://github.com/w3c/ttml2/pull/886

Received on Thursday, 12 July 2018 00:24:45 UTC