[ttml2] Pull Request: Update non-REC CSS links to latest versions, remove CSS box reference (#1188).

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

== Update non-REC CSS links to latest versions, remove CSS box reference (#1188). ==
Closes #1188.

See https://github.com/w3c/ttml2/pull/1191

Received on Saturday, 4 January 2020 22:40:13 UTC