[ttml2] Pull Request: Add #visibility-image, #visibility-version-2; clarify equivalence for…

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

== Add #visibility-image, #visibility-version-2; clarify equivalence for… ==
… #visibility (#839).

Closes #839.

See https://github.com/w3c/ttml2/pull/845

Received on Wednesday, 20 June 2018 09:22:35 UTC